422B & 422e 1 05046.r3 11/03 www .protekde vices.com da ta process line protector only one name means protektion? applica tions ? data processing equipment ? long line transmission systems ? control processing computers ? building management systems iec compa tibility (en61000-4) ? 61000-4-2 (esd): air - 15kv, contact - 8kv ? 61000-4-4 (eft): 40a - 5/50ns ? 61000-4-5 (surge): 8/20s - 95a, level 4 (line-gnd) & 48a, level 4 (line-line) fea tures ? designed for eia standard rs-422 data lines ? automatic reset - does not interrupt service ? permanent two-stage line pair protection ? common mode & differential mode protection ? subnanosecond response time ? effective against lightning, inductive switching and esd mechanical characteristics ? weight: 422B - 28 grams & 422e - 142 grams (approximate) ? flammability rating ul 94v-0 ? device marking: case - logo, terminal designations & part number board - logo, date code & part number description the 422e/b series of protection is a two stage transient voltage protector providing primary and secondary protection against lightning, inductive switching and electro- static discharge (esd) transient threats. the first stage diverts the transient current through the ground terminal return path and the second stage clamps the voltage to a safe level without interruption of service. the 422e/b series is designed to protect data lines from differential (line to line) and common mode (line to ground) transients. terminals 1 and 2, 3 and 4 for the 422e and pins 2 and 3, 4, and 5 for the 422B are designated as line pairs. each line pair is referenced to ground. a transient voltage suppressor is connected across each line pair for differential mode protection. each line pair is referenced to ground. this product can also be used on telephone, signal/data lines, security, timing and control interface circuits. for most applications, the product should be located as close as possible to the equipment being protected. a low impedance grounding system is important to maintain a low voltage clamp between the line-to-ground connection. 05046 422e 422B
2 www .protekde vices.com 05046.r3 11/03 422B & 422e device characteristics installation instructions there are five (5) terminals on the line side and five (5) terminals on the equipment side of the 422e, 4 data lines and one ground. both grounds are connected together internally. a single low impedance is ground sufficient. incoming data lines are cut or disconnected from the equipment to insert the 422e/b products. the incoming lines are to be connected to the line side terminals as the equipment side lines are connected to the equipment side terminals. the location of the product should be as close to the equipment as possible. the 422e/b series is designed with a short circuit failure mode to give maximum protection. a fuse, fussable link, or circuit breaker is recommended for each data/ signal line on the input side for those that require an open circuit failure mode. caution: a low dc resistance ground may not be indicative of a good lightning ground. lightning contains a broad spectrum of frequencies up to 1 mhz. a low impedance path to ground at the transient frequencies is necessary. a ground strap is recommended or a #6 awg stranded wire. for wire lengths over 1.5 meters, there may be some excessive line to earth potential under severe thunderstorm conditions. 24.0 maximum clamping voltage line - line 500a, 8/20s v c volts maximum capacitance @ 0 v, 1 mhz c pf maximum line thruput resistance r ohms 12 24.0 5 5000 maximum ratings @ 25 0 c maximum clamping voltage line - ground 500a, 8/20s v c volts maximum leakage current @ 12 v op i d a peak operatiing line voltage (v op ) operating line current (i o ) maximum transient voltage maximum transient current (8/20s waveform) operating & storage temperature response time 12v 200ma 10kv 10ka/wire 40ka/protector -55c to 100c < 1 nanosecond
3 www .protekde vices.com 05046.r3 11/03 422B & 422e copyright ? protek devices 2003 specifications: protek reserves the right to change the electrical and or mechanical characteristics described herein without notice (except jedec). design changes: protek reserves the right to discontinue product lines without notice, and that the final judgement concerning selection and specifications is the buyer?s and that in furnishing engineering and technical assistance, protek assumes no responsibility with respect to the selection or specifications of such products. package outline & dimensions protek devices 2929 south fair lane, tempe, az 85282 tel: 602-431-8101 fax: 602-431-2288 e-mail: sales@protekdevices.com web site: www .protekde vices .com equipment 1 2 4 gnd 3 2 1 4 gnd 3 warning: line mounting hole for #8 screw 2.25 ? max (57.2mm) 1.19 ? max (30.2mm) #6 screw 0.61 ? max (15.5mm) adhesive mylar label terminal screw terminal strip 3.8 ? max (96.5mm) 1.125 ? (28.575mm) 422e case outline 3.25 ? 0.015 ? (82.6mm0.38mm) output 5 4 3 2 3.8 ? max (95.5mm) 3.0 ? max (76.2mm) 1.9 ? max (48.2mm) 0.30 ? max (7.6mm) 0.07 (17.8mm) gnd equipment 2 5 line orientation notch continuity input 12 13 14 15 input connected to lines from out side world output connected to transmit/receiver circuits note: i/o contacts spaced at 0.156 ? (3.96 mm) centers 422B board outline 0.325 ? max (8.25mm) 12 15
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