 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE PRELIMINARY INFORMATION TCN4040 TCN4040 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE FEATURES s s s s s s s Small Packages ....... SOT-23B-3, TO-92, and SO-8 Output Capacitor Not Required Handles Capacitive Loads Fixed Reverse Breakdown Voltage of 2.5V Low Output Noise Wide Operating Current Range (60A to 15mA) - 40C to + 85C Operating Temperature Range GENERAL DESCRIPTION For applications in tight quarters, the TCN4040 precision voltage reference is available in a space-saving 3mm x 1.3mm SOT-23B-3 surface mount package. The TCN4040 eliminates the need for an external stabilizing capacitor while maintaining stability with any capacitive load. The minimum operating current is 60A. The maximum operating current is 15mA. To ensure that the prime parts have an accuracy of better than 0.5% (C grade) at 25C, the TCN4040 uses fuse and zener-zap reverse breakdown voltage trim during wafer sort. Low dynamic impedance and bandgap reference temperature drift curvature correction maintain stable reverse breakdown voltage accuracy over a wide range of operating temperatures (- 40C to + 85C) and currents from (60A to 15mA). The TCN4040 also is available in both adjustable and 1.2V versions. APPLICATIONS s s s s s s s s Portable, Battery-Powered Equipment Data Acquisition Systems Instrumentation Process Control Energy Management Product Testing Automotive Precision Audio Components ORDERING INFORMATION Part No. TCN4040C-2.5ENB TCN4040C-2.5EOA TCN4040C-2.5EZB TCN4040D-2.5EOA TCN4040D-2.5ENB TCN4040D-2.5EZB TCN4040E-2.5ENB TCN4040E-2.5EZB Output Voltage (V) 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Package SOT-23B-3* 8-Pin SOIC TO-92 8-Pin SOIC SOT-23B-3* TO-92 SOT-23B-3* TO-92 Voltage Tolerance Temp. Coefficient Grade 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 1.0%, 150ppm/C Max (D Grade) 1.0%, 150ppm/C Max (D Grade) 1.0%, 150ppm/C Max (D Grade) 2.0%, 150ppm/C Max (E Grade) 2.0%, 150ppm/C Max (E Grade) NOTE: *SOT-23B-3 is equivalent to the JEDEC (TO-236) PIN CONFIGURATION 8-Pin SOIC NC SOT-23B-3* (TOP VIEW) 8+ 7 NC 6 NC 5 NC NC 1 TO-92-3 123 1 NC 2 NC - 3 4 TCN4040EOA 2 + 3 - TCN4040ENB TCN4040EZB NOTE: *SOT-23B-3 is equivalent to the JEDEC (TO-236) TCN4040-01 6/16/97 NC + - 1 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications to its devices. PRELIMINARY INFORMATION PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE TCN4040 ABSOLUTE MAXIMUM RATINGS* (Note 1) Reverse Current. ....... ...............................................20mA Forward Current ....... ................................................10mA Power Dissipation (TA = 25C) (Note 2) SOT-23B-3 Package ...................................... 230mW TO-92 Package .............................................. 440mW SO-8 Package ................................................470mW Storage Temperature ........................... - 65C to + 150C Lead Temperature (Soldering, 10 seconds) EOA ................................................................ +260C ENB ................................................................ +300C EZB ................................................................. +300C ESD Susceptibility Human Body Model (Note 3) ................................ 2kV Machine Model (Note 3) .....................................200V *Functional operation above the absolute maximum stress rating is not implied. OPERATING RATINGS (NOTES 1 AND 2) Temperature Range (TMIN TA TMAX) ..................... - 40C TA +85C Reverse Current TCN4040-2.5 ...................................... .60A to 15mA NOTES: 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. 2. The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX (maximum junction temperature), JA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDMAX = (TJMAX - TA) /JA or the number given in Absolute Maximum Ratings, whichever is lower. For the TCN4040, TJMAX = 125C, and the typical thermal resistance (JA), when board mounted, is 185C/W for the M package, 326C/W for the SOT-23B-3 package, and 180 C/W with 0.4" lead length and 170C/W with 0.125" lead length for the TO-92-3 package. 3. The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. ELECTRICAL CHARACTERISTICS: Boldface type specifications apply for TA = TJ = TMIN to TMAX. All other specifications; TA = TJ = 25C. TCN4040CEOA TCN4040CENB TCN4040CEZB Symbol Parameter VR Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient Reverse Breakdown Voltage Change with Operating Current Change TCN4040DEOA TCN4040DENB TCN4040DEZB Min -- -- -- -- -- -- TCN4040EENB TCN4040EEZB Min Typ -- -- -- -- -- -- 2.500 -- 45 20 15 15 0.4 Test Conditions IR =100A Notes 4, 5 IR =100A Notes 4, 5, 6 Notes 4, 5 IR =10mA IR =1mA IR =100A Notes 4, 5 IRMIN IR 1mA Notes 4, 5 Min -- -- -- -- -- -- Typ 2.500 Max -- 12 Typ 2.500 Max -- 25 Max -- 50 65 70 Unit V mV A ppm/C 29 49 45 20 15 15 0.4 74 IRMIN VR/T 45 20 15 15 0.4 60 65 100 65 70 150 150 VR/IR -- -- 0.8 1.0 -- -- 1.0 1.2 -- -- 1.0 1.2 mV 1mA IR =12mA ZR Reverse Dynamic Impedance IR =1mA, f = 120Hz, IAC = 0.1 IR Notes 4, 5 -- -- -- 2.3 0.3 6.0 8.0 0.9 -- -- -- 2.3 0.3 8.0 10.0 1.1 -- -- -- 2.3 0.3 8.0 10.0 1.1 mV TCN4040-01 6/16/97 2 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE PRELIMINARY INFORMATION TCN4040 ELECTRICAL CHARACTERISTICS (Cont.): Boldface type specifications apply for TA = TJ = TMIN to TMAX. All other specifications; TA = TJ = 25C. TCN4040CEOA TCN4040CENB TCN4040CEZB Symbol Parameter eN Wideband Noise TCN4040DEOA TCN4040DENB TCN4040DEZB Min -- TCN4040EENB TCN4040EEZB Min Typ Max -- 35 -- Test Conditions Min -- Typ 35 Max -- Typ 35 Max -- Unit Vmsec VR IR =100A, 10Hz f 10kHz Notes 4, 5 Reverse Breakdown t =1000hrs Voltage Long Term T = 25C 0.1C Stability IR =100A Notes 4, 5 -- 120 -- -- 120 -- -- 120 -- ppm/C NOTES: 4. Typicals are at TJ = 25C and represent most likely parametric norm. 5. Limits are 100% production tested at 25C. 6. The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance [(VR/T)(65C)(VR)]. VR/T is the VR temperature coefficient, 65C is the temperature range from - 40C to the reference point of 25C, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades is shown below: C-grade: 1.15% = 0.5% 100ppm/C x 65C D-grade: 1.98% = 1.0% 150ppm/C x 65C E-grade: 2.98% = 2.0% 150ppm/C x 65C PIN DESCRIPTION Pin No. (SOT-23B-3) 1 Pin No. TO-92 1 Pin No. 8-Pin SOIC 1 2 3 Symbol NC NC NC + - - NC NC NC + Description No connection No connection No connection Positive terminal Negative terminal Negative terminal No connection No connection No connection Positive terminal 2 3 2 3 4 5 6 7 8 TCN4040-01 6/16/97 3 PRELIMINARY INFORMATION PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE TCN4040 APPLICATIONS INFORMATION Available in a space saving SOT-23B-3 surface mount package, the TCN4040 is a precision micro-power curvature-corrected bandgap shunt voltage reference. The TCN4040 is designed for stable operation without an external capacitor connected between the "+" pin and the "-" pin. The TCN4040 also remains stable, however, if a bypass capacitor is used. The minimum operating current increase is 60mA and the maximum operating current is 15mA. The TCN4040, in the SOT-23B-3 package has a parasitic Schottky diode between pin 3 (-) and pin 1. (Die attach interface contact). Therefore, pin 1 of the SOT-23B-3 package must be left floating or connected to pin 3. In a conventional shunt regulator application, an external series resistor (RS) is connected between the supply voltage and the TCN4040 (Figure 1). RS determines the current that flows through the load (IL) and the TCN4040 (IQ). Even when the supply voltage is at its minimum, and the load current is at its maximum value, RS should be small enough to supply at least the minimum acceptable IQ to the TCN4040 since load current and supply voltage may vary. Conversely, when the supply voltage is at its maximum and IL is at its minimum, RS should be large enough that the current flowing through the TCN4040 is less than 15mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the TCN4040's reverse breakdown voltage, VR. VS - VR RS = IL + IQ VS RS VR IQ + IL IL IQ TCN4040 Figure 1. Shunt Regulator TCN4040-01 6/16/97 4 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE PRELIMINARY INFORMATION TCN4041 TCN4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE FEATURES s s s s s s s Small Packages ....... SOT-23B-3, TO-92, and SO-8 Output Capacitor Not Required Handles Capacitive Loads Adjutable Voltage and Fixed Reverse Breakdown Voltage of 1.2V Low Output Noise Wide Operating Current Range (60A to 15mA) - 40C to + 85C Operating Temperature Range GENERAL DESCRIPTION For applications in tight quarters, the TCN4041 precision voltage reference is available in a space-saving 3mm x 1.3mm SOT-23B-3 surface mount package. The TCN4041 eliminates the need for an external stabilizing capacitor while maintaining stability with any capacitive load. The minimum operating current is for both the TCN40411.2V and the TCN4041-ADJ. Both versions have a maximum operating current of 12mA. To ensure that the prime parts have an accuracy of better than 0.5% (C grade) at 25C, the TCN4041 uses fuse and zener-zap reverse breakdown voltage trim during wafer sort. Low dynamic impedance and bandgap reference temperature drift curvature correction maintain stable reverse breakdown voltage accuracy over a wide range of operating temperatures (- 40C to + 85C) and currents from (60A to 12mA). The TCN4041 is available in small SOT-23, TO-92, and SO-8 packages. APPLICATIONS s s s s s s s s Portable, Battery-Powered Equipment Data Acquisition Systems Instrumentation Process Control Energy Management Product Testing Automotive Precision Audio Components ORDERING INFORMATION Part No. TCN4041C-1.2ENB TCN4041C-ADJENB TCN4041C-1.2EOA TCN4041C-ADJEOA TCN4041C-1.2EZB TCN4041C-ADJEZB TCN4041D-2.5EOA TCN4041D-4.1EOA TCN4041D-1.2ENB TCN4041D-ADJENB TCN4041D-1.2EZB TCN4041D-ADJEZB TCN4041E-1.2ENB TCN4041E-1.2EZB Output Voltage (V) 1.2 ADJ 1.2 ADJ 1.2 ADJ 2.5 4.1 1.2 ADJ 1.2 ADJ 1.2 1.2 Package SOT-23B-3* SOT-23B-3* 8-Pin SOIC 8-Pin SOIC TO-92 TO-92 8-Pin SOIC 8-Pin SOIC SOT-23B-3* SOT-23B-3* TO-92 TO-92 SOT-23B-3* TO-92 Voltage Tolerance Temp. Coefficient Grade 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 0.5%, 100ppm/C Max (C Grade) 1.0%, 150ppm/C Max (D Grade) 1.0%, 150ppm/C Max (D Grade) 1.0%, 150ppm/C Max (D Grade) 1.0%, 150ppm/C Max (D Grade) 1.0%, 150ppm/C Max (D Grade 1.0%, 150ppm/C Max (D Grade) 2.0%, 150ppm/C Max (E Grade) 2.0%, 150ppm/C Max (E Grade) NOTE: *SOT-23B-3 is equivalent to the JEDEC (TO-236) TCN4041-01 6/19/97 1 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications to its devices. PRELIMINARY INFORMATION PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE TCN4041 ABSOLUTE MAXIMUM RATINGS* (Note 1) Reverse Current. ....... ...............................................20mA Forward Current ....... ................................................10mA Power Dissipation (TA = 25C) (Note 2) SOT-23B-3 Package ...................................... 230mW TO-92 Package .............................................. 440mW SO-8 Package ................................................470mW Storage Temperature ........................... - 65C to + 150C Lead Temperature (Soldering, 10 seconds) EOA ................................................................ +260C ENB ................................................................ +300C EZB ................................................................. +300C ESD Susceptibility Human Body Model (Note 3) ................................ 2kV Machine Model (Note 3) .....................................200V *Functional operation above the absolute maximum stress rating is not implied. OPERATING RATINGS (NOTES 1 AND 2) Temperature Range (TMIN TA TMAX) ..................... - 40C TA +85C Reverse Current TCN4041-1.2 ....................................... 60A to 12mA TCN40401-ADJ .................................... 68A to12mA Output Voltage Range TCN4041-ADJ ....................................... 1.24V to 10V NOTES: 1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. 2. The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX (maximum junction temperature), JA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDMAX = (TJMAX - TA) /JA or the number given in Absolute Maximum Ratings, whichever is lower. For the TCN4041, TJMAX = 125C, and the typical thermal resistance (JA), when board mounted, is 185C/W for the M package, 326C/W for the SOT-23B-3 package, and 180 C/W with 0.4" lead length and 170C/W with 0.125" lead length for the TO-92-3 package. 3. The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. ELECTRICAL CHARACTERISTICS: Boldface type specifications apply for TA = TJ = TMIN to TMAX. All other specifications; TA = TJ = 25C. All other specifications; TA = TJ = 25C. The grades C, D, and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0%, and 2.0%, respectively. TCN4041CEOA TCN4041CENB TCN4041CEZB Symbol Parameter VR Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient Reverse Breakdown Voltage Change with Operating Current Change TCN4041DEOA TCN4041DENB TCN4041DEZB Min -- -- -- -- -- -- TCN4041EENB TCN4041EEZB Min Typ -- -- -- -- -- -- 2.500 -- 45 20 15 15 0.4 Test Conditions IR =100A Notes 4, 5 IR =100A Notes 4, 5, 6 Notes 4, 5 IR =10mA IR =1mA IR =100A Notes 4, 5 IRMIN IR 1mA Notes 4, 5 Min -- -- -- -- -- -- Typ 1.225 Max -- 6 Typ 2.500 Max -- 12 Max -- 25 65 70 Unit V mV A ppm/C 14 45 20 15 15 0.7 60 65 100 24 45 20 15 15 0.4 36 IRMIN VR/T 65 70 160 150 VR/IR -- -- 1.5 2.0 -- -- 2.0 2.5 -- -- 2.0 2.5 mV 1mA IR =12mA ZR Reverse Dynamic Impedance IR =1mA, f = 120Hz, IAC = 0.1 IR Notes 4, 5 -- -- -- 2.5 0.5 6.0 8.0 1.5 -- -- -- 2.3 0.3 8.0 10.0 2.0 -- -- -- 2.3 0.3 8.0 10.0 2.0 mV TCN4041-01 6/19/97 2 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE PRELIMINARY INFORMATION TCN4041 ELECTRICAL CHARACTERISTICS (Cont.): Boldface type specifications apply for TA = TJ = TMIN to TMAX. All other specifications; TA = TJ = 25C. The grades C, D, and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0%, and 2.0%, respectively. TCN4041CEOA TCN4041CENB TCN4041CEZB Symbol Parameter eN Wideband Noise TCN4041DEOA TCN4041DENB TCN4041DEZB Min -- TCN4041EENB TCN4041EEZB Min Typ Max -- 20 -- Test Conditions Min -- Typ 20 Max -- Typ 20 Max -- Unit Vmsec VR IR =100A, 10Hz f 10kHz Notes 4, 5 Reverse Breakdown t =1000hrs Voltage Long Term T = 25C 0.1C Stability IR =100A Notes 4, 5 -- 120 -- -- 120 -- -- 120 -- ppm/C NOTES: 4. Typicals are at TJ = 25C and represent most likely parametric norm. 5. Limits are 100% production tested at 25C. 6. The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance [(VR/T)(65C)(VR)]. VR/T is the VR temperature coefficient, 65C is the temperature range from - 40C to the reference point of 25C, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades is shown below: C-grade: 1.15% = 0.5% 100ppm/C x 65C D-grade: 1.98% = 1.0% 150ppm/C x 65C E-grade: 2.98% = 2.0% 150ppm/C x 65C 7. When VOUT 1.6V, the TCN4041-ADJ in the SOT-23B package must operate at reduced IR. This is caused by the series resistance of the die attach between the die (-) output and the package (-) output pin. See the Output Saturation (SOT23-B only) curve in the Typical Characteristics section. 8. Reference voltage and temperature coefficient will change with output voltage. See Typical Characteristics curves. PIN CONFIGURATION SOT-23B-3* (TOP VIEW) NC TO-92-3 123 8-Pin SOIC NC 1 1 8+ 7 NC 6 NC 5 NC NC 2 2 + 3 - NC - 3 4 TCN4041EZB-1.2V 123 TCN4041ENB-1.2V TCN4041EOA-1.2V NC 1 NC + - NC 1 8+ 7 NC 6 NC 5 NC NC 2 NC 3 4 TCN4041-ADJ 2 + 3 - - TCN4041ENB-ADJ NOTE: *SOT-23B-3 is equivalent to the JEDEC (TO-236) TCN4041-01 6/19/97 TCN4041EOA-ADJ 3 PRELIMINARY INFORMATION PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE TCN4041 PIN DESCRIPTION Pin No. (SOT-23B-3) 1 Pin No. TO-92 1 Pin No. 8-Pin SOIC 1 2 3 Symbol NC NC NC + - - NC NC NC + Description No connection No connection No connection Positive terminal Negative terminal Negative terminal No connection No connection No connection Positive terminal 2 3 2 3 4 5 6 7 8 APPLICATIONS INFORMATION Available in space-saving SOT-23B-3 surface mount packages, the TCN4041 is a precision micro-power curvature-corrected bandgap shunt voltage reference. It is designed for stable operation without an external capacitor connected between the "+" pin and the "-" pin. The TCN4041 also remains stable, however, if a bypass capacitor is used. The device is available in either a fixed 1.2V or an adjustable reverse breakdown voltage. The minimum operating current is 60mA, and the maximum operating current is 12mA for both options. TCN4041s in the SOT-23 package have pin 1 connected as the (-) output. (Die attach interface contact). Therefore, pin 1 of the TCN4041-1.2 must be left floating or connected to pin 3, and pin 1 on the TCN4041-ADJ is the (-) output. In a conventional shunt regulator application, an external series resistor (RS) is connected between the supply voltage and the TCN4041 (Figure 1). RS determines the current that flows through the load (IL) and the TCN4041 (IQ). Even when the supply voltage is at its minimum, and the load current is at its maximum value, RS should be small enough to supply at least the minimum acceptable IQ to the TCN4041 since load current and supply voltage may vary. Conversely, when the supply voltage is at its maximum and IL is at its minimum, RS should be large enough that the current flowing through the TCN4041 is less than 12mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the TCN4041's reverse breakdown voltage, VR. VS - VR RS = IL + IQ TCN4041-01 6/19/97 Output voltage on the TCN4041-ADJ can be adjusted to any value between 1.24V and 10V. It is a function of the internal reference voltage (VREF) and the ratio of the external feedback resistors (see Figure 2). The output can be found with the equation (where VOUT is the desired output voltage): VOUT = VREF (R2/R1 + 1) Equation 1. The value of the internal VREF is a function of VO. The "corrected" VREF can be determined by (where VO is the desired output voltage): VREF' = VOUT VREF/VOUT) +VY Equation 2. VREF/VOUT is typically -1.3mV/V, and VY = 1.240V. Replace the value of VREF' in Equation 1 with the value determined using Equation 2. The actual output voltage can deviate from that predicted by the typical VREF/VO in Equation 2. The worst case VREF/VOUT for C-grade parts is - 2.5mV/V and VY = 1.246V; for D-grade, the worst case is - 3.0mV/V and VY = 1.248V. The difference in output voltage resulting from typical worst case values are shown in the following example: Let VO = +9V. Using the typical value of VREF/VOUT, VREF is 1.228; choosing a value of R1 = 10k, R2 = 63.272kW. The output voltage, when using worst case VREF/VOUT for C-grade and D-grade parts, is 8.965V and 8.946V, respectively. This could result in errors as large as 0.39% for C-grade, and 0.59% for D-grade parts. However, resistor values resulting from the typical value of VREF/VOUT will work most of the time, requiring no additional adjustments. 4 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE PRELIMINARY INFORMATION TCN4041 VS VS TCN4041-ADJ RS RS VR IQ + IL IL IQ R1 VOUT TCN4041 R2 Figure 1. Shunt Regulator Figure 2. Adjustable Shunt TCN4041-01 6/19/97 5 |
Price & Availability of TCN4040E-25EZB
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |