rev. 1.0 july 2011 www.aosmd.com page 1 of 6 AOZ8234 four-line tvs diode general description the AOZ8234 is a transient voltage suppressor diode array designed to protect data lines from high transient conditions and esd. this st ate-of-the-art device utilizes aos leading edge trench vertical structure [tvs] 2 ? technology for superior clamping performance. this device incorporates four tvs diodes in a single package. due to the flexibility of the design, the package can be configured as a two channel bidirectional tvs array. during transient conditions, the tvs diodes direct the transient to ground. they may be used to meet the esd immunity requirements of iec 61000-4-2, level 4 (15 kv air, 8 kv contact discharge). the AOZ8234 comes in an rohs compliant dfn package and is rated over a -40 c to +85 c ambient temperature range. the very small 1.45 mm x 1.0 mm x 0.55 mm dfn package makes it idea l for applications where pcb space is a premium. the small size and high esd protection makes it ideal for protecting high speed video and data communication interfaces. features z esd protection for high-speed data lines: ? exceeds: iec 61000-4-2 (esd) 18 kv (air), 18 kv (contact) ? human body model (hbm) 30 kv z trench vertical structure [tvs] 2 ? based technology used to achieve excellent esd clamping performance z small package saves board space z low insertion loss z protects four unidirectional or two bidirectional i/o lines z low clamping voltage z low operating voltage: 5.0v z green product, pb-free applications z portable handheld devices z keypads, data lines z notebook computers z digital cameras z portable gps z mp3 players typical applications pin configuration ch1 vn ch2 ch4 n/c ch3 i/o1 i/o2 i/o3 i/o4 top view unidirection protection of four lines bidirection protection of two lines i/o1 i/o2 1 2 3 6 4 5 1 2 3 6 4 5
AOZ8234 rev. 1.0 july 2011 www.aosmd.com page 2 of 6 ordering information aos green products use reduced levels of halogens, and are also rohs compliant. please visit www.aosmd.com/web/qualit y/rohs_compliant.jsp for additional information. 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 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 . part number ambient temperature range package environmental AOZ8234di -40 c to +85 c dfn 1.45 x 1.0 green product rohs compliant parameter rating vp ? vn 5 v peak pulse current (i pp ), t p = 8/20 s 4 a storage temperature (t s ) -65 c to +150 c esd rating per iec61000-4-2, contact (1) 18 kv esd rating per iec61000-4-2, air (1) 18 kv esd rating per human body model (2) 30 kv parameter rating junction temperature (t j ) -40 c to +125 c symbol parameter conditions min. typ. max. units v rwm reverse working voltage between pin 5 and 2 (3) 5.0 v v br reverse breakdown voltage i t = 1 ma, between pins 5 and 2 (4) 6.0 v i r reverse leakage current v rwm = 5 v, between pins 5 and 2 0.1 a v f diode forward voltage i f = 15 ma 0.70 0.85 1.0 v v cl channel clamp voltage positive transients negative transient i pp = 15 a, tp = 100 ns, any i/o pin to ground 12.0 -10.0 v v channel clamp voltage positive transients negative transient i pp = 25 a, tp = 100 ns, any i/o pin to ground 15.0 -18.0 v v c j junction capacitance v r = 0 v, f = 1 mhz, any i/o pin to ground 13.5 16.0 pf
AOZ8234 rev. 1.0 july 2011 www.aosmd.com page 3 of 6 typical performance characteristics clamping voltage vs. peak pulse current (tperiod = 100ns, tr = 1ns) 16 15 14 13 12 11 10 9 8 7 6 peak pulse current, i pp (a) clamping voltage, v cl (v) clamping voltage vs. current (tperiod = 100ns, tr = 1ns) current (a) clamping voltage (v) capacitance vs. reverse bias reverse bias (volts) capacitance (pf) 51015202530 20 18 16 14 12 10 8 6 4 2 0 16 14 12 10 8 6 4 2 0 51015202530 012345
AOZ8234 rev. 1.0 july 2011 www.aosmd.com page 4 of 6 applications information device connection for protection of four data lines these devices are designed to protect up to four unidirectional data lines. the device is connected as follows. 1. unidirectional protection of four i/o lines is achieved by connecting pins 1, 3, 4, and 6 to the data lines. connect pin 2 to ground. the ground connection should be made directly to the ground plane for best results. the path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. device connection for protection of two bidirectional data lines these devices are designed to protect up to two bidirectional data lines. the device is connected as follows. 1. bidirectional protection of two i/o lines is achieved by connecting pins 1 and 3 to the data lines. connect pin 4 and 6 to ground. the ground connection should be made directly to the ground plane for best results. the path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. circuit board layout recommendations for suppression of esd good circuit board layout is critical for the suppression of esd induced transients. the following guidelines are recommended: z place the tvs near the input terminals or connectors to restrict transient coupling. z minimize the path length between the tvs and the protected line. z minimize all conductive loops including power and ground loops. z the esd transient return path to ground should be kept as short as possible. z never run critical signals near board edges. z use ground planes whenever possible. protection of four unidirectional lines i/o1 i/o2 i/o3 i/o4 1 2 3 6 4 2 13 46 circuit diagram 5 protection of two bidirectional lines i/o1 i/o2 6 4 1 2 3 5 4 13 circuit diagram 6
AOZ8234 rev. 1.0 july 2011 www.aosmd.com page 5 of 6 package dimensions, dfn 1.45 x 1.0, 6l e pin #1 dot by marking a a1 c unit: mm 0.50 0.24 0.48 0.72 1.20 d b1 e b l 1 2 3 e 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 0.20 1.40 0.95 0.33 nom. 0.55 ? 0.25 0.40 0.152 ref. 1.45 1.00 0.50 bsc 0.38 max. 0.60 0.05 0.30 1.50 1.05 0.43 symbols a a1 b b1 c d e e l dimensions in inches min. 0.020 0.000 0.008 0.055 0.037 0.013 nom. 0.022 ? 0.010 0.016 0.006 ref. 0.057 0.039 0.020 bsc 0.015 max. 0.024 0.002 0.012 0.059 0.041 0.017 0.20 0.40 0.36
rev. 1.0 july 2011 www.aosmd.com page 6 of 6 AOZ8234 AOZ8234di (dfn 1.45 x 1.0) lwp part number code assembly lot & location code week & year code part marking 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. this data sheet 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 supp ort devices or systems.
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