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A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Package K, 4-pin SIP The A1421, A1422 and A1423 are ac-coupled Hall-effect sensors which include monolithic integrated circuits that switch in response to changing differential magnetic fields created by rotating ring magnets or, when coupled with a magnet, by ferrous targets. This family of devices also includes an integrated capacitor that provides the high accuracy of analog sensing without an external filter capacitor. This reduces cost and components, while improving the reliability of the final sensor solution. Magnetic field changes are sensed by two integrated Hall transducers and then are differentially amplified on the chip. Differential sensing provides immunity to radial vibration, within the device operating air gap range, by rejection of this common-mode signal change. Steady-state system offsets are eliminated using an on-chip differential bandpass filter with integrated capacitor. This filter also provides relative immunity to interference from electromagnetic sources. The device utilizes advanced temperature compensation for the high-pass filter, sensitivity, and Schmitt trigger switchpoints to guarantee optimal operation to low frequencies over a wide range of air gaps and temperatures. Each device includes: a voltage regulator, two Hall transducers, temperature compensating circuitry, a low-level amplifier, bandpass filter, Schmitt trigger, and an output driver. The on-board regulator permits operation with supply voltages from 4.0 to 26.5 V. The output stage can switch 20 mA over the full frequency response range of the sensor, and is compatible with TTL and CMOS logic circuits. Continued on next page...
1. VCC 2. VOUT 3. TEST 4. GND
1
2
3
4
Features and Benefits
* * * * * * * * * * * * Integrated tracking capacitor Senses motion of ring magnet or ferrous targets Wide operating temperature range Operation with magnetic input signal frequency from 20 Hz to 30 kHz EMI/ESD-resistant Large effective air gaps 4.0 to 26.5 V supply operating range Output compatible with both TTL and CMOS logic families Reverse battery protection Resistant to mechanical and thermal stress Accurate true zero crossing switchpoint (A1421 only) High vibration immunity, in running mode (A1423 only)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ........................................ 28 V* Reverse-Supply Voltage, VRCC ........................ -18 V Output Current, IOUT .......................................25 mA Reverse-Output Current, IROUT.....................-50 mA Operating Temperature Ambient, TA, Range L ................ -40C to 150C Maximum Junction, TJ(max)........................165C Storage Temperature, TS .................. -65C to 170C *Refer to Power Derating section.
A1421a-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
The devices in this family differ from each other in their switchpoint speci? cations and their switching polarity. The A1421 has a small hysteresis and asymmetrical switchpoints, with one switchpoint at the zero-crossing. The A1422 has a small hysteresis and symmetrical switchpoints, both near the zerocrossing. The A1423 offers high vibration immunity, by means of its larger hysteresis that establishes symmetrical switchpoints further from the zero-crossing. The output polarities are shown in the Product Selection Guide table.
This variety of options provides ? exibility for achieving solutions for a wide range of applications, including automotive transmission and crankshaft speed sensing. The device package has an operating ambient temperature range -40 C to 150C , and is provided in a 4-pin plastic SIP. Each package is available in a lead (Pb) free version (suffix, -T) , with a 100% matte tin plated leadframe.
Product Selection Guide
Output Switching at BDIFF = 0 BDiff Increasing Low (On) to High (Off) High (Off) to Low (On) High (Off) to Low (On) BDiff Decreasing High (Off) to Low (On) Low (On) to High (Off) Low (On) to High (Off)
Switchpoints BOP(typ) (G) 15 15 65 BRP(typ) (G) 0 -15 -65 BOP(max)+ BRP(min) (G) 15 0 0
Symmetry BOP(typ)+ BRP(typ) (G) 15 0 0 BOP(min)+ BRP(max) (G) 7.5 0 0 Bulk, 500 pieces/bag Packing2
Part Number
Pb-free1
A1421LK-T A1422LK-T A1423LK A1423LK-T
1Pb-based
Yes Yes - Yes
variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A1421LK and A1422LK.
2Contact Allegro
for additional packing options.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
2
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Functional Block Diagram
VS+ VCC (Pin 1) TEST (Pin 3)
Regulator Dual Hall Transducers Bandpass Filter Integrated Tracking Capacitor
Diagnostic Circuitry
Comparator 0.1 uF Hall Amp Gain Stage
VOUT (Pin 2)
VREF
GND (Pin 4)
(Required)
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
3
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
OPERATING CHARACTERISTICS Valid at TA = - 40C to 150C, TJ 165C; over operational air gap range and VCC within operating range, unless otherwise noted. Typical operating parameters: VCC = 12 V and TA = 25C.
Characteristic ELECTRICAL CHARACTERISTICS Supply Voltage Supply Current Output Saturation Voltage Output Leakage Current VCC ICC VOUT(SAT) ISINK = 20 mA IOFF VOUT = 24 V, Bdiff = 0 Operating; TJ < TJ(max) 4.0 - - - 12 4.2 140 - 26.5 7.0 400 5 V mA mV A Symbol Test Conditions Min. Typ. Max. Units
PROTECTION COMPONENT CHARACTERISTICS Reverse Supply Current Supply Zener Current Supply Zener Clamp Voltage1 Output Zener Current Output Zener Clamp Voltage Output Short Circuit Current Limit RESPONSE CHARACTERISTICS Power-On State Power-On Time2,6 Settling Time3,6 Response Time6 Upper Corner Frequency Lower Corner Frequency OUTPUT CHARACTERISTICS Output Rise Time4 Output Fall Time
Continued on next page.
IRCC IZSupply VZSupply IZOutput VZOutput IOUTS(lim)
VCC = -18 V VS = 28 V ICC = 10 mA, TA = 25C VOUT = 28 V IOUT = 3 mA, TA = 25C
- - 28 - 28 -
- - 33 - - -
-1 10 37 3 - 50
mA mA V mA V mA
POS tPO tSettling fCU fCL tr tf
t < tResponse VCC > VCC(min) fBdiff 100 Hz -3 dB, single pole -3 dB, single pole RPU = 1 k, COUTC2 = 10 pF RPU = 1 k, ISINK = 20 mA, COUTC2 = 10 pF
- - 0 4.5 20 - - -
High 4.5 - - - - - -
- 9 50 59 - 20 200 200
V ms ms ms kHz Hz ns ns
tResponse Equal to tPO + tSettling; fBdiff 100 Hz
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
4
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
OPERATING CHARACTERISTICS, continued Valid at TA = - 40C to 150C, TJ 165C; over operational air gap range and VCC
within operating range, unless otherwise noted. Typical operating parameters: VCC = 12 V and TA = 25C. Characteristic Symbol Test Conditions 1421, Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from low (on) to high (off) 1422, Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from high (off) to low (on) 1423, Bdiff increasing, fBdiff = 200 Hz, Bdiff = 200 Gp-p VOUT switches from high (off) to low (on) 1421, Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from high (off) to low (on) 1422, Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from low (on) to high (off) 1423, Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 200 Gp-p VOUT switches from low (on) to high (off) 1421, fBdiff = 200 Hz, Bdiff = 50 Gp-p 1422, fBdiff = 200 Hz, Bdiff = 50 Gp-p 1423, fBdiff = 200 Hz, Bdiff = 200 Gp-p Applied Magnetic Field7
1I CC
2Time 3Time
Min.
Typ.
Max.
Units
MAGNETIC CHARACTERISTICS5,6 0.0 5.0 10.0 -12.5 -35.0 -100.0 5 - - - 15.0 15.0 65.0 0.0 -15.0 -65.0 15 30 130 - 27.5 35.0 100.0 7.5 -5.0 -10.0 35 - - 1250 G G G G G G G G G G
Operate Point
BOP
Release Point
BRP
Hysteresis
BHYS Bdiff
Differential p-p magnetic field
required to initialize device. required for the output switchpoints to be within specification. 4Output Rise Time will be dominated by the RC time constant. 5For lower frequencies, the absolute values of B , B , and B OP RP HYS may decrease due to delay induced by the high-pass filter. 6 See Definitions of Terms section. 7 Exceeding the maximum magnetic field may result in compromised absolute accuracy.
is equivalent to ICC(max) + 3 mA.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
5
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic Package Thermal Resistance Symbol RJA Test Conditions* Minimum-K PCB (single-sided with copper limited to solder pads) Value 177 Units C/W
*In still air. Additional thermal information available on Allegro Web site.
30 28 26
Power Derating Curve TJ(max) = 165C; ICC = ICC(max)
VCC(max)
Maximum Power Dissipation, PD(max) TJ(max) = 165C; VCC = VCC(max); ICC = ICC(max)
900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 20 40 60
Maximum Allowable VCC (V)
24
Power Dissipation, PD (m W)
22 20 18 16 14 12 10 8 6 4 2 0 20 40 60 80 100 120 140 160 180
M (R inim
J A
Minimum-K PCB (RJA = 177 C/W)
u = m-K 17 P 7C C B /W )
VCC(min)
80 100 120 Temperature (C)
140
160
180
Definitions of Terms The following provide additional information about some of the parameters cited. For additional information, visit the Allegro Web site at www.allegromicro.com. Applied Magnetic Field, Bdiff - The differential magnetic flux density, which is calculated as the arithmetic difference of the flux densities observed by each of the two Hall elements. fBdiff is the input signal frequency. Output Off Switchpoint (Operate Point), BOP - The value of increasing differential magnetic flux density at which the device output switches from low to high (A1421) or high to low (A1422 and A1423). Output On Switchpoint (Release Point), BRP - The value of decreasing differential magnetic flux density at which the device output switches from high to low (A1421) or from low to high (A1422 and A1423). Power-On Time, tPO - The time needed by the device, after power is applied, to initialize all circuitry necessary for proper operation. Settling Time, tSettling - The time required by the device, after tPO, and after a valid magnetic signal has been applied, to provide proper output transitions. Settling time is a function of magnetic offset, offset polarity, signal phase, signal frequency, and signal amplitude. Supply Current (on), ICC(on) - The current draw of the device with the output transitor is turned on. Supply Current (off), ICC(off) - The current draw of the device with the output transitor is turned off. Response Time, tResponse - The total time required for generating zero-crossing output transitions after initialization (the sum of Power-on Time and Settling Time).
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
6
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Empirical Results
10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 -50
Over VCC Range
VCC (V)
4.5 12.0 20.0
ICC(OFF) by TA
ICC(OFF) by VCC
10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 Over TA Range
TA (C)
150 25 -40
Current (mA)
0
50
100
150
200
Current (mA)
0
5
10
15
20
25
Ambient Temperature, TA (C)
Supply Voltage, VCC (V)
10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 -50
Over VCC Range
VCC (V)
4.5 12.0 20.0
ICC(ON) by TA
ICC(ON) by VCC
10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 Over TA Range
TA (C)
150 25 -40
Current (mA)
0
50
100
150
200
Current (mA)
0
5
10
15
20
25
Ambient Temperature, TA (C)
Supply Voltage, VCC (V)
500 450 400 350 300 250 200 150 100 50 0 -50
Over VCC Range; ISINK = 20 mA
VCC (V)
4.5 12.0 20.0
VOUT(SAT) by TA
0
50
100
150
200
500 450 400 350 300 250 200 150 100 50 0 0
Over TA Range; ISINK = 20 mA
TA (C)
150 25 -40
VOUT(SAT) by VCC
Voltage (mV)
Voltage (mV)
5
10
15
20
25
Ambient Temperature, TA (C)
Supply Voltage, VCC (V)
Continued on next page.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
7
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Simulation Results
Continued on next page.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
8
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Simulation Results, continued
Continued on next page.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
9
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Simulation Results, continued
Continued on next page.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
10
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Simulation Results, continued
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
11
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Sensor Evaluation: EMC Characterization
Please contact Allegro MicroSystems for EMC performance information. (EMC test results are available after review of first silicon.)
Test Name ESD - Human Body Model* ESD - Machine Model Conducted Transients Direct RF Injection Bulk Current Injection TEM Cell Reference Specification AEC-Q100-002 AEC-Q100-003 ISO 7637-1 ISO 11452-7 ISO 11452-4 ISO 11452-3
*ESD test is done with no external components.
Vs
R2
C1
1 VCC
R1
2
4
GND
A1421, A1422 or A1423
VOUT
C2
TEST 3
Component R1* R2 C1 C2
Value 1 100 0.1 0.1
Units k F F
*Pull-up resistor not required for protection but for normal operation.
Recommended EMC test circuit. Test circuit recommended configuration may change after evaluation of first silicon.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
12
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor Applications Information
The A1421, A1422, and A1423 are versatile high-precision differential sensors that can be used in a wide range of applications. Proper choice of the target material and shape, magnet material and shape, and assembly techniques enables large working air gaps and high switchpoint accuracy over the device operating temperature range. Sensor Operation The device sensor IC contains two integrated Hall transducers that are used to differentially sense a magnetic field across the surface of the IC. Referring to figure 1, which shows curves for the A1421 as an example, the trigger switches the output when the differential magnetic field crosses the BOP level while increasing in strength (referred to as the positive direction). In the example, the A1421 output voltage switches high (off), and switches the output low (on) when the differential magnetic field crosses BRP while decreasing (the negative direction). The operation is achieved through the use of two separate comparators. One comparator has a positive hysteresis, BHYS1, and the other a negative hysteresis, BHYS2. Therefore, one comparator switches at the BOP crossing on an increasing differential signal and the other switches at the BRP crossing on a decreasing differential signal. The hysteresis on each comparator precludes false switching on noise or target jitter. The behavior is similar for the A1422 and the A1423. The switchpoints are as shown in the magnetic charactersitics table, and the output polarity is inverted. This is illustrated in figure 2, on the next page. Start-up During power-on time, tPO, the output signal, VOUT, is high. Beyond this time, if the applied magnetic field, Bdiff, is smaller than BHYS, the switching state and VOUT polarity are indeterminate. VOUT will be valid for Bdiff > BHYS, after the additional settling time, tSettling, has also elapsed. Delay The bandpass filter induces delay in the output signal, VOUT, relative to the applied magnetic field, Bdiff. Simulation data shown
BRP(typ)1421 BHYS1 B OP(typ)1421 Applied Magnetic Field, Bdiff
15.0 0.0
A
A
BHYS2
Comparator 1, A1421
Comparator 2, A1421
1421 Switching State
Off
Off On
1421 Output Signal, VOUT
Figure 1. Typical output characteristics with dual comparator operation. The example shown is for the A1421. Characteristics shown without delay, see characteristic data charts for delay and phase shift contributions.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
13
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
in the Characteristic Data section quantify the effect of the input signal amplitude on the phase shift of the output. Positive values of delay indicate a lagging output, while negative values indicate a leading output. AC-Coupled Operation Steady-state magnet and system offsets are eliminated using an on-chip differential bandpass filter. The upper and lower cut-off frequencies of this patented filter are set using an internal integrated capacitor. The differential structure of this filter improves the ability of the IC to reject single-ended noise on the GND or VCC lines and, as a result, makes the device more resistant to EMI (electromagnetic interference) typically seen in hostile remote-sensing environments. Power Supply Protection The device contains an on-chip voltage regulator and can operate over a wide supply voltage range. In applications that operate the device from an unregulated power supply, transient protection must be added externally. For applications using a regulated line, EMI/RFI protection may still be required. The circuit shown in figure 3 is the most basic configuration required for proper device operation.
Typical Circuit A pull-up resistor, RPU, is required between the supply and output terminals, as shown in figure 3. Also, the auxilliary terminal, TEST, must be connected externally to the GND terminal.
VS 1 0.1 uF 4
VCC A1421, A1422 or A1423 GND VOUT
RPU 2 VOUT
TEST
3
Figure 3. Basic application circuit. A pull-up resistor, RPU, is required
with the output driver.
B OP(typ)1423
65.0
BOP(typ)1421, 1422 Applied Magnetic Field, Bdiff
15.0 0.0 -15.0
BRP(typ)1421 B RP(typ)1422
-65.0
B RP(typ)1423
1421 Switching State and Output Signal, VOUT
Off
On
Off
1422 Switching State and Output Signal, VOUT
On
Off
On
1423 Switching State and Output Signal, VOUT
On
Off
On
t+
Figure 2. Comparative typical output characteristics. This chart illustrates the switchpoints and the output polarities of the A1421, A1422, and the A 1423. Characteristics shown without delay, see characteristic data charts for delay and phase shift contributions.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
14
A1421-DS
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Power Derating The device must be operated below the maximum junction temperature of the device, TJ(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the application. This section presents a procedure for correlating factors affecting operating TJ. (Thermal data is also available on the Allegro MicroSystems Web site.) The Package Thermal Resistance, RJA, is a figure of merit summarizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. Its primary component is the Effective Thermal Conductivity, K, of the printed circuit board, including adjacent devices and traces. Radiation from the die through the device case, RJC, is relatively small component of RJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate TJ, at PD. PD = VIN x IIN T = PD x RJA TJ = TA + T (1) (2) (3)
Example Reliability for VCC at TA = 150C, package L-I1, using minimumK PCB Observe the worst-case ratings for the device, specifically: RJA = 177C/W, TJ(max) = 165C, VCC(max) = 26.5 V, and ICC(max) = 7.0 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: Tmax = TJ(max) - TA = 165 C - 150 C = 15 C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = Tmax / RJA = 15C / 177 C/W = 91 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) / ICC(max) = 91 mW / 7.0 mA = 13 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages VCC(est). Compare VCC(est) to VCC(max). If VCC(est) VCC(max), then reliable operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.
For example, given common conditions such as: TA= 25C, VCC = 12 V, ICC = 4.2 mA, and RJA = 177 C/W, then: PD = VCC x ICC = 12 V x 4.2 mA = 50 mW T = PD x RJA = 50 mW x 177 C/W = 9C TJ = TA + T = 25C + 9C = 34C A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RJA and TA.
A1421-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
15
A1421, A1422, A1423
High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor
Package K, 4-pin SIP
.208 5.28 .203 5.16
.0866 2.20 NOM .0592 1.50 NOM .0507 1.29 NOM E1 .045 1.14 MIN .085 2.16 MAX
C
.063 1.60 .059 1.50
B
.138 3.51 .133 3.38
E2 A .033 0.84 NOM
.021 0.53 MAX
.600 15.24 .560 14.23
.017 0.44 .014 0.35
1
2
3
4
.019 .014
0.48 0.36
.050 1.27 NOM
Dimensions in inches Millimeters in brackets, for reference only Case dimensions exclusive of mold flash or gate burrs Mold flash .010 [0.25] MAX, gate burr .008 [0.20] MAX, dambar protrusion .004 [0.10] MAX Exact case and lead configuration at supplier discretion within limits shown A Dambar removal protrusion (8X)
B Ejector mark on opposite side C
Active Area Depth .0165 [0.42] NOM
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copyright (c) 2004, 2005 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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A1421-DS

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