only one name means protektion? www.protekdevices.com 05039.r5 9/12 page 1 05039 485elc high speed ethernet data line protector d escription the 485elc is low capacitance, two-stage transient voltage protector the provides primary and secondary protecton against lightning, inductve switching and electrostatc discharge (esd) transient threats. the frst stage diverts the transient current through the ground terminal return path and the second stage clamps the voltage to a safe level without interrupton of service. the 485elc is designed to protect data lines, transmission lines, tming and control interface circuits from common- mode (line-to-ground) or diferental (line-line) transients. terminals 1 & 2 and 3 & 4 are designed as line pairs. a transient voltage suppressor is connected across each line pair for diferental mode protecton. capacitance over the operatng voltage range is important. if capacitance is non-linear, distorton, loss of data or ac - cess to the i/o port can occur (see figure 1). applications ? ethernet & catagory 5 systems ? rs-485 serial communicaton lines ? isdn equipment/systems ? video transmission systems ? smoke detector & fire alarm systems f eat u res ? compatble with iec 61000-4-2 (esd): air - 15kv, contact - 8kv ? compatble with iec 61000-4-4 (eft): 40a - 5/50ns ? compatble with iec 61000-4-5 (surge): 95a, 8/20s, level 4 (line- gnd) & 48a, level 4 (line-line) ? low capacitance - 25pf ? designed for eia standard rs-485 data lines ? permanent two-stage 2 line pair protector ? subnanosecond response time ? common & diferental mode protecton ? automatc reset - does not interrupt service ? efectve against lightning, inductve switching and esd m echanical characteristics ? approximate weight: 142 grams ? flammability ratng ul 94v-0 485elc fig u re 1 t y pical lo w capacitance c u r v e v (op) - circuit operatng - v olts 0 1 2 3 4 5 10 100 c - tv s capactance - pf industry standard low capacitance tvs protector protek device 1,000
only one name means protektion? www.protekdevices.com 05039.r5 9/12 page 2 05039 485elc t y pical de v ice characteristics maxim u m ratings @ 25c u nless otherwise specifed parameter s y mbol v al u e u nits peak operatng line voltage v op 7 volts operatng line current i o 250 ma transient voltage - 20 kv/wire transient current - 8/20s waveform - 10 ka/wire transient current - 8/20s waveform - 40 ka/wire operatng temperature t a -55 to 100 c storage temperature t stg -55 to 100 c response time - < 1 ns electrical characteristics per line @ 25c u nless otherwise specifed part n u mber maxim u m clamping v oltage (8/20s) line - line / line - gnd @ 500a v c v olts maxim u m line thr u p u t resistance r ohms maxim u m leakage c u rrent @ 7v op i d a maxim u m capacitance @ 0-7v, 1 mh z c p f 485elc 20.0 12 10 25
only one name means protektion? www.protekdevices.com 05039.r5 9/12 page 3 05039 485elc package information unprotected side protected side 2 1 gnd 3 4 2 1 gnd 3 4 earth ground earth ground (line input terminal) data line from outside world (equipment terminal) to transmit/receive circuits note: both ground terminals are common. use second ground wire to reduce impedance on long runs to earth ground connectons. installation instr u ctions & diagram this product should be located as close as possible to the equipment being protected. a low impedance grounding system is important to maintain a low clamping voltage between the line-to-ground connecton. there are fve (5) terminals on both the line and equipment side of the 485elc - four data line terminals and two ground terminals. both ground terminals, as shown on the label, are connected internally. a single ground connecton is sufcient. however, it is recommended that both ground connectons be used for a lower imped - ance path to earth. this connecton can be made through the green ac power ground wire or a known earth ground. the ground wire should be #14 stranded wire. incoming data lines are cut or disconnected from the equipment to insert the 485elc product. the line side of the terminals are to be connected to data lines from the outside world or lines that carry the transient threats into the equipment to be protected. the equipment side of the terminals are to be connected to the equip - ment to be protected . the locaton of the product should be such that these wires are as short as possible. a #18 or 20 gauge wire can be used for these connec - tons. proteks data line protector is designed with a short circuit failure mode to give maximum protecton. a fuse, fusible link, or circuit breaker is recommended for each data/signal line on the input (line) side of the protector for those applicatons that require an open circuit failure mode. cauton: a low dc resistance ground may not be indicatve 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 potental under severe thunderstorm conditons. for these applicatons, an additonal protector may be necessary at the equipment interface.
only one name means protektion? www.protekdevices.com 05039.r5 9/12 page 4 05039 485elc package information a b c d e f mountng hole for #8 screw terminal screw a adhesive mylar label terminal strip #6 screws equipment line 4 3 gnd 2 1 1 2 gnd 3 4 warning o u tline dimensions dim millimeters inches min max min max a - 95.5 - 3.8 b 82.22 82.98 3.235 3.265 c - 57.2 - 2.25 d - 30.2 - 1.125 e - 15.5 - 0.61 f - 30.2 - 1.19 ordering information base part n u mber marking 485elc logo, date code, terminal designatons and part number
only one name means protektion? www.protekdevices.com 05039.r5 9/12 page 5 05039 485elc compan y information copyright ? protek devices 1998 - this literature is subject to all applicable copyright laws and is not for resale in any manner. specifications: protek reserves the right to change the electrical and or mechanical characteristcs described herein without notce. design changes: protek reserves the right to discontnue product lines without notce and that the fnal judgement concerning selecton and specifcatons is the buyers and that in furnishing engineering and technical assistance. protek assumes no responsibility with respect to the selecton or specifcatons of such products. protek makes no warranty, representaton or guarantee regarding the suitability of its products for any partcular purpose, nor does protek assume any liability arising out of the applicaton or use of any product or circuit and specifcally disclaims any and all liability without limitaton special, consequental or incidental damages. life support policy: protek devices products are not authorized for use in life support systems without writen consent from the factory. compan y profile in business more than 20 years, protek devices? is a privately-held company located in tempe, arizona, that ofers a product line of tran - sient voltage suppressors (tvs); avalanche breakdown diodes; steering diode tvs arrays and other surge suppressor component products. these tvs devices protect electronic systems from the efects of lightning, electrostatc discharge (esd), nuclear electromagnetc pulses (nemp), inductve switching and emi / rfi. protek devices also ofers high performance interface and linear products that include analog switches; multplexers; led drivers; audio control ics; rf and related high frequency products. the analog devices work in a host of con - sumer; industrial; automotve and other applicatons. contact us corporate headquarters 2929 south fair lane tempe, arizona 85282 usa by telephone general: 602-431-8101 sales: & marketng: 602-414-5109 customer service: 602-414-5114 product technical support: 602-414-5107 by fax general: 602-431-2288 by e-mail: sales: sales@protekdevices.com customer service: service@protekdevices.com technical support: support@protekdevices.com protek devices (asia pacifc) pte. ltd. 8 ubi road 2, #06-19 zervex singapore - 408538 tel: +65-67488312 fax: +65-67488313 w eb www.protekdevices.com
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