rev. 1.0 november 2011 www.aosmd.com page 1 of 8 AOZ8818 ultra-low capacitance tvs diode general description the AOZ8818 is a transient voltage suppressor array designed to protect high spee d data lines from damaging esd events. this device incorporates 16 surge rated, low capacitance steering diodes and a tvs in a single package. during transient conditions, the st eering diodes direct the transient to either the positive side of the power supply line or to ground. the AOZ8818 provides a typical capacitance of 0.3 pf and low insertion loss up to 6ghz providing greater signal integrity, making it ideally suited for high speed data line applications such as digital tvs, dvd players, computing, set-top boxes and mddi applications in mobile computing devices. the AOZ8818 comes in a rohs compliant and halogen free 2.5 mm x 1.0 mm x 0.55 mm dfn-10 package and is rated -40 c to +85 c junction temperature range. features ? esd protection for high-speed data lines: ? iec61000-4-2, level 4 (esd) immunity test ? air discharge: 15 kv; contact discharge: 15 kv ? iec61000-4-4 (eft) 40a (5/50 ns) ? iec61000-4-5 (lightning) 4 a (8/20 s) ? human body model (hbm) 24 kv ? array of surge rated diodes with internal tvs diode ? small package saves board space ? protects four i/o lines ? low capacitance: 0.3 pf ? low clamping voltage ? low operating voltage: 3.3v, 5.0 v applications ? high speed serial ports ? monitors and flat panel displays ? set-top box ? video graphics cards ? digital video interface (dvi) ? notebook computers typical application i/o1 i/o2 i/o3 i/o4
AOZ8818 rev. 1.0 november 2011 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/web/quality/rohs_compliant.jsp 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 = 150 pf, r discharge = 330 ? . 2. human body discharge per mil-std-883, method 3015 c discharge = 100 pf, r discharge = 1.5 k ? . maximum operating ratings part number ambient temperature range package environmental AOZ8818di-03 -40 c to +85 c 2.5 mm x 1.0 mm x 0.55 mm dfn-10 rohs compliant green product AOZ8818di-05 parameter AOZ8818di-03 AOZ8818di-05 storage temperature (t s ) -65c to +150c esd rating per iec61000-4-2, contact (1) 15 kv esd rating per iec61000-4-2, air (1) 15 kv esd rating per human body model (2) 24 kv parameter rating junction temperature (t j ) -40 c to +125 c 1 2 3 4 5 10 9 8 7 6 ch1 ch2 vn ch3 ch4 nc nc vn nc nc dfn-10 (top view)
AOZ8818 rev. 1.0 november 2011 www.aosmd.com page 3 of 8 electrical characteristics t a = 25c unless otherwise s pecified. specifications in bold indicate a temperature range of -40 c to +85 c. notes: 3. measurements performed using a 100 ns transmission line pulse (tlp) system. 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 . symbol parameter symbol parameter i pp maximum reverse peak leakage current v br (5) breakdown voltage v cl (3) clamping voltage @ i pp i t test current v rwm (4) working peak reverse voltage c j max. capacitance @ v r = 0 and f = 1 mhz i r maximum reverse leakage current device device marking v rwm (v) max. v br (v) min. i t = 100 a i r ( a) max. v cl max. c j (pf) i pp = 1 a i pp = 12 a typ. max AOZ8818di-03 g 3.3 3.5 1.0 5 17.5 0.30 0.45 AOZ8818di-05 e 5.0 6.0 1.0 6 18 0.30 0.45
AOZ8818 rev. 1.0 november 2011 www.aosmd.com page 4 of 8 (t period = 100ns, t r = 1ns) forward voltage vs. forward peak pulse current forward current, i pp (a) i/o ? gnd insertion loss (s21) vs. frequency frequency (mhz) s21 (db) analog crosstalk (i/o?i/o) vs. frequency frequency (mhz) insertion loss (db) 1 10 100 1000 10000 -120 -100 -80 -60 -40 -20 0 1 10 100 1000 10000 -3.00e+01 -2.50e+01 -2.00e+01 -1.50e+01 -1.00e+01 -5.00e+00 0.00e+00 0 1 2 3 4 5 6 7 8 0 2 4 6 8 10 12 14 forward voltage (v) (t period = 100ns, t r = 1ns) clamping voltage vs. peak pulse current peak puse current, i pp (a) 0 2 4 6 8 10 12 14 clamping voltage, v cl (v) AOZ8818di-3 AOZ8818di-5 AOZ8818di-3 AOZ8818di-5 AOZ8818di-3 AOZ8818di-5 4 6 8 10 12 14 16 18 20 AOZ8818di-3 AOZ8818di-5 typical performance characteristics
AOZ8818 rev. 1.0 november 2011 www.aosmd.com page 5 of 8 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 aoz8808di devices should be located as close as possible to the noise source. the aoz8808di device should be placed on all data and power lines that enter or exit the pcb at the 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 aoz8808di devices as close as possible to the noise source ensures that a surge 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 that the surge energy w ill be dissipated by the aoz8808di device. long sig nal traces will act as antennas to receive energy from fields that are produced by the esd pulse. by keepi ng line lengths as short as possible, the efficiency of the line to act as an antenna for esd related fields 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 mi nimizing 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 power planes. one effective method to minimize loop problems is to incorporate a ground plane in the pcb design. the aoz8808di 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 aoz8808di is designed for ease of pcb layout by allowing the traces to run underneath the device. the pinout of the aoz8808di is designed to simply drop onto the io lines of a high definition multimedia interface (hdmi) or usb 3.0 design without having to divert the signal lines that may add more parasitic inductance. pins 1, 2, 4 and 5 are connected to the internal tvs devices and pins 6, 7, 9 and 10 are no connects. the no connects was done so the package can be securely soldered onto the pcb surface. figure 3. flow through layout for hdmi figure 4. flow through layout for usb 3.0 clock data0 ground data1 data2 clock data0 ground data1 data2 ssrx+ ssrx? ground sstx+ sstx? ssrx+ ssrx? ground sstx+ sstx?
AOZ8818 rev. 1.0 november 2011 www.aosmd.com page 6 of 8 note: 1. controlling dimension is millimeter. converted inch dimensions are not necessarily exact. e pin #1 dot by marking a a1 c 0.30 0.50 0.10 0.15 0.36 0.72 0.40 0.20 1.20 0.24 0.48 db b1 e 1 5 e pin #3 identification r 0.130 l symbols a a1 b b1 c d e e l dimensions in millimeters recommended land pattern side view top view bottom view min. 0.50 0.00 0.15 2.45 0.95 0.33 nom. 0.55 ? 0.20 0.40 0.152 ref. 2.50 1.00 0.50 bsc 0.38 max. 0.60 0.05 0.25 2.55 1.05 0.43 symbols a a1 b b1 c d e e l dimensions in inches min. 0.020 0.000 0.006 0.096 0.037 0.013 nom. 0.022 ? 0.008 0.016 0.006 ref. 0.098 0.039 0.020 bsc 0.015 max. 0.024 0.002 0.010 0.100 0.041 0.017 package dimensions, dfn 2. 5mm x 1.0mm x 0.55mm, 10l
rev. 1.0 november 2011 www.aosmd.com page 7 of 8 AOZ8818 tape and reel dimensions, df n 2.5mm x 1.0mm x 0.55mm, 10l carrier tape reel a?a leader / trailer & orientation tape size 8mm reel size ?178 m ?178.0 1.0 package dfn 2.5x1.0 t 0.25 0.05 b0 2.62 0.05 a0 1.12 0.05 k0 0.70 0.05 d0 ?1.55 0.05 d1 ?0.55 0.05 e1 1.75 0.1 e 8.00 +0.3/-0.1 e2 3.50 0.05 p0 4.00 0.10 p1 4.0 0.10 p2 2.0 0.05 n ?60.0 0.5 trailer tape 300mm min. components tape orientation in pocket leader tape 500mm min. e1 e2 e t r g unit: mm unit: mm feeding direction w 11.80 0.5 h ?13.0 +0.5 / ?0.2 w1 9.0 0.5 s 2.40 0.10 k 10.25 0.2 e ?9.8 r ? w1 m w n h sk ref 5 b0 k0 p1 p2 d0 d1 p0 a0
AOZ8818 rev. 1.0 november 2011 www.aosmd.com page 8 of 8 part marking ec12 part number code assembly lot code week and year code AOZ8818di-05 (2.5 x 1.0 dfn) gc12 part number code assembly lot code week and year code AOZ8818di-03 (2.5 x 1.0 dfn) 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 provided 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. this datasheet contains preliminary data; supplementary data may be published at a later date. alpha & omega semiconductor reserves the right to make changes at any time without notice. life support policy alpha & omega semiconductor products ar e not authorized for use as critical components in life support devices or systems.
|
