general description the aoz8905 is a transient voltage suppressor array designed to protect high speed data lines such as hdmi, usb 2.0, mddi, sata, and gigabit ethernet from damaging esd events. this device incorporates eight surge rated, low capacitance steering diodes and a tvs in a single package. during transient conditions, the steering diodes direct the transient to either the positive side of the power supply line or to ground. the aoz8905 provides a typical line to line capacitance of 0.35pf and low insertion loss up to 3ghz providing greater signal integrity maki ng it ideally suited for hdmi 1.3 or usb 2.0 applications, such as digital tvs, dvd players, computing, set-top boxes and mddi applications in mob ile computing devices. the aoz8905 comes in rohs compliant and halogen free sot23-6l package and is rated -40c to +85c junction temperature range. features z esd protection for high-speed data lines: ? iec 61000-4-2, level 4 (esd) immunity test ? 15kv (air discharge) and 8kv (contact discharge) ? iec61000-4-4 (eft) 40a (5/50ns) ? iec61000-4-5 (lightning) 2.5a (8/20s) ? human body model (hbm) 15kv z array of surge rated diodes with internal tvs diode z small package saves board space z protects four i/o lines z low capacitance between i/o lines: 0.35pf z low clamping voltage z low operating voltage: 5.0v applications z hdmi, usb 2.0, mddi, sata ports z monitors and flat panel displays z set-top box z video graphics cards z digital video interface (dvi) z notebook computers typical application figure 1. hdmi ports aoz8905 aoz8905 tx2+ tx2- tx1+ tx1- tx0+ tx0- clk+ clk- hdmi transmitter rx2+ rx2- rx1+ rx1- rx0+ rx0- clk+ clk- hdmi receiver connector connector aoz8905 aoz8905 AOZ8905CI 1 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
ordering 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 ? . maximum operating ratings part number ambient temperature range package environmental AOZ8905CI -40c to +85c sot23-6l rohs compliant green product 1 2 3 6 5 4 ch1 vn ch2 ch4 nc ch3 sot23-6 (top view) parameter rating storage temperature (t s ) -65c to +150c esd rating per iec61000-4-2, contact (1) 8kv esd rating per iec61000-4-2, air (1) 15kv esd rating per human body model (2) 15kv parameter rating junction temperature (t j ) -40c to +125c AOZ8905CI 2 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
electrical characteristics t a = 25c unless otherwise s pecified. specifications in bold indicate a temperature range of -40c to +85c. notes: 3. the working peak reverse voltage, v rwm , should be equal to or greater than the dc or continuous peak operating voltage level. 4. v br is measured at the pulse test current i t . 5. measurements performed using a 100ns transmission line pulse (tlp) system. symbol parameter conditions min. typ. max. units v rwm reverse working voltage between i/o and vn (3) 5.0 v v br reverse breakdown voltage i t = 1ma, between i/o and vn (4) 6.0 v i r reverse leakage current v rwm = 5v, between i/o and vn 1 a v f diode forward voltage i f = 15ma 0.70 0.85 1 v v cl channel clamp voltage positive transients negative transient i pp = 1a, tp = 100ns, any i/o pin to ground (5) 15.0 -3.5 v v channel clamp voltage positive transients negative transient i pp = 5a, tp = 100ns, any i/o pin to ground (5) 22.0 -6.0 v v channel clamp voltage any i/o pin to ground i pp = 1a, tp = 8/20s 15.5 v c j channel input capacitance v r = 0v, f = 1mhz, between i/o pins 0.35 0.40 pf v r = 0v, f = 1mhz, any i/o pin to ground 0.70 0.80 pf AOZ8905CI 3 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
4 of 9 typical performance characteristics clamping voltage vs. peak pulse current (t period = 100ns, t r = 1ns) (t period = 100ns, t r = 1ns) peak pulse current, i pp (a) clamping voltage, v cl (v) forward voltage vs. forward current forward current, i pp (a) forward voltage (v) i/o ? gnd insertion loss (s21) vs. frequency frequency (mhz) insertion loss (db) analog crosstalk (i/o?i/o) vs. frequency frequency (mhz) insertion loss (db) 10 15 20 25 1.0 2.0 3.0 4.0 5.0 5 0 -5 -10 -15 -20 -25 1 10 100 1000 10000 1 2 3 4 5 6 7 1.0 2.0 3.0 4.0 5.0 1.5 2.5 3.5 4.5 1.5 2.5 3.5 4.5 -120 -100 -80 -60 -40 -20 0 1 10 100 1000 10000 typical variation of c in vs. v r ) (v p = 3.3v, f = 1mhz, t = 25?c input voltage (v) normalized input capacitance (pf) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 AOZ8905CI 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
tdr for hdmi 1.3 the aoz8905 tdr test results indicates the minimal effect the low capacitance has on the hdmi 1.3 tdr measurements. below are the graphs from the tdr measurements. the two graphs show the before and after results of the tdr of each of the differential data line (clock, d0, d1, d2) of the hdmi when the aoz8905 was populated onto the pcb. figure 2. ideal stripe-line figure 3. with aoz8905 device on the board (tdr measurement with 200ps rise time using aos evaluation board) high speed 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 aoz8905 devices should be lo cated as close as possible to the noise source. the placement of the aoz8905 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 aoz8905 devices as close as possible to the noise source ensures that a sur ge 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 aoz8905 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 efficien cy 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 significant 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 powe r planes. one effective method to minimize loop problems is to incorporate a ground plane in the pcb design. the aoz8905 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 voltage the internal steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. the aoz8 905 is designed for the ease of pcb layout by allowing the traces to run underneath the device. the pinout of th e aoz8905 is designed to simply drop onto the io lines of a high definition multimedia interface (hdmi) or usb 3.0 design with minimal diversion of the signal lines that may add more parasitic inductance. 125 120 115 110 105 100 95 90 85 80 75 125 120 115 110 105 100 95 90 85 80 75 0.100ns/ 0.7500 ns -0.200 ns (step 2.56 ps) 0.100ns/ 0.7500 ns -0.200 ns (step 2.56 ps) AOZ8905CI 5 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
based on the aoz8905 sot23-6 package design, a very straight forward layout can be achieved. to give the tdr an extra level of margin the traces may be compensated to have a nominal impedance of 90 ? throughout the differential pair. to make the design perfect the added capacitance of the device will have to be compensated by the use of ?skinny traces?. the skinny traces are a narrow stripe line acting to lower the parasitic capacitance on the differential stripe line. the differential impedance of the usb 3.0 transmission line becomes well centered to 90 ? . a layout em field simulator is recommended before fabrication to insure a perfect stripe line. with care ful layout and placement of the device, the aoz8905 can protect the usb 3.0 data line effectively and safely and meet the esd immunity requirements of the iec61000-4-2, level 4, 15kv air discharge, 8kv contact discharge. figure 4. hdmi pcb layout with compensated traces number of layers 4 copper trace thickness 1.4 mils dielectric constant, r 4.6 overall board thickness 62 mils dielectric thickness between top and ground layer 10 mils AOZ8905CI 6 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
7 of 9 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 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 0.100mm (4 mil) unless otherwise specified. 4. followed from jedec mo-178c & mo-193c. 6. 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 0.80 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 0.031 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 AOZ8905CI 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
tape and reel dimensions, sot23-6l package sot-23 (8mm) a0 b0 k0 e e1 e2 d0 d1 p0 p1 p2 t 3.15 0.10 0.10 3.20 0.10 0.10 1.40 min. 1.00 1.50 8.00 0.10 1.75 0.05 3.50 0.10 4.00 0.10 4.00 0.05 2.00 0.05 0.25 unit: mm unit: mm tape reel leader/trailer and orientation 0.30 trailer tape (300mm min., 75 empty pockets) components tape orientation in pocket leader tape (500mm min., 125 empty pockets) k0 b0 a0 d0 p0 feeding direction p2 e2 e1 e p1 d1 t w1 g v r m n w h k s tape size 8mm reel size ?180 m ?180.00 0.50 n ?60.50 w 9.00 0.30 w1 11.40 1.00 h ?13.00 +0.50 / -0.20 k 10.60 s 2.00 0.50 g ?9.00 r 5.00 v 18.00 AOZ8905CI 8 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
package marking week & year code assembly lot code part number code AOZ8905CI (sot-23) option & assembly location code at AOZ8905CI 9 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
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