rev. 1.0 december 2014 www.aosmd.com page 1 of 8 AOZ8903 ultra-low capacitanc e tvs diode array general description the AOZ8903 is a transient voltage suppressor array designed to protect high speed data lines from electro static discharge (esd) and lightning. this device incorporates eight surge rated, low capacitance steering diodes and a transient voltage suppressor (tvs) in a single package. during transient conditions, the steering dio des direct the transient to either the positive side of the power supply line or to ground. they may be used to meet the esd immunity requirements of iec 61000-4-2, level 4 (15kv air, 8kv contact discharge). the AOZ8903 comes in ro hs compliant sot-23 package. it is rated over a -40c to +85c ambient temperature range. features ? esd protection for high-speed data lines: ? iec 61000-4-2 (esd) 20kv (air), 15kv (contact) ? iec 61000-4-5 (lightning) 4a (8/20s) ? iec 61000-4-4 (eft) 40a (5/50ns) ? human body model (hbm) 24kv ? protects four i/o lines ? low clamping voltage ? low operating voltage: 5.0v applications ? usb 2.0 power and data line protection ? video graphics cards ? monitors and flat panel displays ? digital video interface (dvi) typical application figure 1. 2 usb high speed ports +5v r t vbus AOZ8903 usb host controller downstream ports vbus d+ d- gnd r t +5v r t vbus d+ d- gnd r t
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 2 of 8 ordering information aos green products use reduced levels of halogens, and are also rohs compliant. please visit www.aosmd.com/media/aosgreenpolicy.pdf for additional information. pin configuration absolute maximum ratings exceeding the absolute maximum ratings may damage the device. notes: 1. iec 61000-4-2 discharge with c discharge = 150pf, r discharge = 330 ? . 2. human body discharge per mil-std-883, method 3015 c discharge = 100pf, r discharge = 1.5k ? . part number ambient temperature range package environmental AOZ8903ci -40c to +85c sot23-6 rohs compliant green product 1 2 3 6 5 4 ch1 vn ch2 ch4 vp ch3 sot23-6 (top view) parameter rating vp ? vn 6v peak pulse current (i pp ), t p = 8/20s 4a peak power dissipation (8/20s) @ 25c 40w storage temperature (t s ) -65c to +150c esd rating per iec61000-4-2, contact (1) 15kv esd rating per iec61000-4-2, air (2) 20kv esd rating per human body model (2) 24kv junction temperature (t j ) -40c to +125c
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 3 of 8 electrical characteristics t a = 25c unless otherwise specified notes: 3. these specifications are guaranteed by design. 4. the working peak reverse voltage, v rwm , should be equal to or greater than the dc or continuous peak operating voltage level. 5. v br is measured at the pulse test current i t . 6. measurements performed using a 100 nsec transmission line pulse (tlp) system. symbol parameter conditions min. typ. max. units v rwm reverse working voltage between pin 5 and 2 (4) 5.5 v v br reverse breakdown voltage i t = 1ma, between pins 5 and 2 (5) 6.0 v i r reverse leakage current v rwm = 5v, any i/o pin to ground 1.0 a v f diode forward voltage i f = 15ma, any i/o pin to ground 0.6 1.0 v v cl channel clamp voltage positive transients i pp = 1a, tp = 100ns, any i/o pin to ground (3)(6) 3.0 v channel clamp voltage positive transients ipp = 5a, tp = 100ns, any i/o pin to ground (3)(6) 4.5 v channel clamp voltage positive transients ipp = 12a, tp = 100ns, any i/o pin to ground (3)(6) 7.0 v c j junction capacitance v r = 0v, f = 1mhz, any i/o pin to ground (3) 0.5 0.75 pf ? c j channel input capacitance matching v r = 0v, f = 1mhz, between i/o pins (3) 0.03 pf
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 4 of 8 typical performance characteristics 0 -5 -10 -15 -20 -25 -30 30 25 20 15 10 5 0 tlp current vs. clamping voltage clamping voltage (v) tlp current (a) 024681012 forward current vs. forward voltage (tperiod = 100ns, tr = 1ns) forward voltage (v) forward current (a) -15 -12 -9 -6 -3 0 1.0 0.8 0.6 0.4 0.2 0 typical variation of cin vs. vin (f = 1mhz, t = 25c) working voltage (v) junction capacitance (pf) 012345
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 5 of 8 application information the AOZ8903 tvs is design to protect four data lines from fast damaging transient over-voltage by clamping it to a reference. when the tr ansient on a protected data line exceed the reference voltage the steering diode is forward bias thus, conducting the harmful esd transient away from the sensitive circuitry under protection. pcb layout guidelines printed circuit board layout is the key to achieving the highest level of surge immunity on power and data lines. the location of the protection devices on the pcb is the simplest and most important design rule to follow. the AOZ8903 devices should be lo cated as close as possible to the noise source. the placement of the AOZ8903 devices should be used on all data and power lines that enter or exit the pcb at th e i/o connector. in most systems, surge pulses occur on data and power lines that enter the pcb through the i/o connector. placing the AOZ8903 devices as close as possible to the noise source ensures that a su rge voltage will be clamped before the pulse can be coupled into adjacent pcb traces. in addition, the pcb should use the shortest possible traces. a short trace length equates to low impedance, which ensures t hat the surge energy will be dissipated by the AOZ8903 device. long signal traces will act as antennas to receive energy from fields that are produced by the esd pulse. by keeping line lengths as short as possible, the efficiency of the line to act as an antenna for esd related fiel ds is reduced. minimize interconnecting line lengths by placing devices with the most interconnect as close together as possible. the protection circuits should shunt the surge voltage to either the reference or chassis ground. shunting the surge voltage directly to the ic?s signal ground can cause ground bounce. the clamping performance of tvs diodes on a single ground pcb can be improved by minimizing the impedance with relatively short and wide ground traces. the pcb layout and ic package parasitic inductances can cause signific ant overshoot to the tvs?s clamping voltage. the inductance of the pcb can be reduced by using short trace lengths and multiple layers with separate ground and power planes. one effective method to minimize loop problems is to incorporate a ground plane in the pcb design. the AOZ8903 ultra-low capacitance tvs is designed to protect four high speed data transmission lines from transient over-voltages by clamping them to a fixed reference. the low inductance and construction minimizes voltage overshoot during high current surges. when the voltage on the protected line exceeds the reference volt age the internal steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. good circuit board layout is critical for the suppression of esd induced transients. the following guidelines are recommended: 1. place the tvs near the io terminals or connectors to restrict transient coupling. 2. fill unused portions of the pcb with ground plane. 3. minimize the path length between the tvs and the protected line. 4. minimize all conductive loops including power and ground loops. 5. the esd transient return path to ground should be kept as short as possible. 6. never run critical signals near board edges. 7. use ground planes whenever possible. 8. avoid running critical signal traces (clocks, resets, etc.) near pcb edges. 9. separate chassis ground traces from components and signal traces by at least 4mm. 10. keep the chassis ground trace length-to-width ratio <5:1 to minimize inductance. 11. protect all external connections with tvs diodes.
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 6 of 8 package dimensions, sot23-6l e1 e a a2 a1 e e1 d .010mm 0.80 0.95 0.63 2.40 b l c gauge plane seating plane 0.25mm 1 1.20 notes: 1. package body sizes exclude mold flash and gate burrs. mold flash at the non-lead sides should be less than 5 mils each. 2. dimension ?l? is measured in gauge plane. 3. tolerance 0.100 mm (4 mil) unless otherwise specified. 4. followed from jedec mo-178c & mo-193c. 5. controlling dimension is millimeter. converted inch dimensions are not necessarily exact. symbols a a1 a2 b c d e e1 e e1 l 1 dimensions in millimeters min. 0.90 0.00 0.70 0.30 0.08 2.70 2.50 1.50 0.30 0 nom. ? ? 1.10 0.40 0.13 2.90 2.80 1.60 0.95 bsc 1.90 bsc ? ? max. 1.25 0.15 1.20 0.50 0.20 3.10 3.10 1.70 0.60 8 symbols a a1 a2 b c d e e1 e e1 l 1 min. 0.035 0.00 0.028 0.012 0.003 0.106 0.098 0.059 0.012 0 nom. ? ? 0.043 0.016 0.005 0.114 0.110 0.063 0.037 bsc 0.075 bsc ? ? max. 0.049 0.006 0.047 0.020 0.008 0.122 0.122 0.067 0.024 8 dimensions in inches unit: mm recommended land pattern
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 7 of 8 tape and reel dimensions, sot23-6l tape reel leader/trailer and orientation trailer tape 300mm min. components tape orientation in pocket leader tape 500mm min. unit: mm unit: mm j feeding direction tape size 8 mm reel size ?177.80 m ?177.80 max. n ?55.00 min. w1 8.40 +1.50/-0.00 package sot-23 a0 3.15 0.10 b0 3.20 0.10 k0 1.40 0.10 d0 1.50 0.05 d1 1.00 0.10/-0.0 e 8.00 0.30 e1 1.75 0.10 e2 3.50 0.05 p0 4.00 0.10 p1 4.00 0.10 p2 2.00 0.05 t 0.23 0.03 h ?13.00 +0.50 / -0.20 s 1.50 min. k 10.10 min. r 12.70 j 4.00 +0.10/-0.10 t k0 b0 d1 a0 d0 p2 p1 p0 e1 e2 e r w1 n m s k h a a a?a unit per reel: 3000pcs
AOZ8903 rev. 1.0 december 2014 www.aosmd.com page 8 of 8 part marking buow lt assembly date lot numbe r part number otption & assembly location AOZ8903ci (sot-23) as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provid ed in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. legal disclaimer alpha and omega semiconductor makes no representations or warranties with respect to the accuracy or completeness of the inform ation provided herein and takes no liabilit ies for the consequences of use of such information or any product described herein. alpha and omega semiconductor reserves the right to make changes to such information at any time without further notice. this document does not constitute the grant of any intellectual property rights or representation of non-infringem ent of any third party?s intellectual property rights. life support policy alpha and omega semiconductor products are not author ized for use as critical components in life support devices or systems.
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