1 www.protekdevices.com 05039.r2 4/02 485ELC high speed ethernet data line protector applications ? ethernet - 10/100 base t ? catagory 5 systems ? rs-485 serial communication lines ? isdn equipment/systems ? video transmission systems iec compatibility (en61000-4) ? 61000-4-2 (esd): air - 15kv, contact - 8kv ? 61000-4-4 (eft): 40a - 5/50ns ? 61000-4-5 (surge): 8/20s - 95a, l4(line-gnd) & 48a, l4(line-line) features ? low capacitance - 25pf ? designed for eia standard rs-485 data lines ? permanent two-stage 2 line pair protection ? subnanosecond response time ? common & differential mode protection ? automatic reset - does not interupt service ? effective against lightning, inductive switching and esd mechanical characteristics ? weight: 485ELC - 142 grams(approximate) ? flammability rating ul 94v-0 ? device marking: logo, part number & terminal designations description the 485ELC is low capacitance, two-stage transient voltage protector the provides primary and secondary protection against lightning, inductive switching and electrostatic 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 interuption of servic. the 485ELC is designed to protect data lines, transmission lines, timing and control interface circuits from common-mode (line-to-ground) or differential (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 differential mode protection. capacitance over the operating voltage range is important. if capacitance is non-linear, distortion, loss of data or access to the i/o port can occur (see figure 1). 05039 . . . engineered solutions for the transient environment? 485ELC maximum ratings @ 25c maximum clamping voltage (8/20s) @ 500a v c volts maximum leakage current @ 7v op i d a maximum capacitance @ 0-7v, 1mhz c pf 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 electrical characteristics @ 25c 7v 250ma 20kv 10ka/wire 40ka/protector -55c to 100c < 1 nanosecond maximum line thruput resistance r ohms 20 12 10 25 figure 1 linear capacitance vs non-linear capacitance 0 2 4 6 8 10 v op - data line operating voltage - volts c - capacitance - pf 1,000 100 1,0 industry standard low capacitance solid state protector protek?s 485ELC
2 www.protekdevices.com 485ELC 05039.r2 4/02 copyright ? protek devices 2001 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. installation instructions 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 connection. there are five (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 connection is sufficient. however, it is recommended that both ground connections be used for a lower impedance path to earth. this connection 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 to 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 equipment to be protected . the location 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 connections. protek?s data line protector 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 (line) side of the protector for those applications 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 frequen- cies 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. for these applications, an additional protector may be necessary at the equipment interface. 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.protekdevices.com installation diagram 485ELC case outline equipment 1 2 4 gnd 3 2 1 4 gnd 3 warning: line 3.8 ? max (95.5mm) 3.25 ? 0.015 ? (82.6mm0.38mm) 2.25 ? max (57.2mm) mounting hole for #8 screw 1.19 ? max (30.2mm) #6 screw 0.61 ? max (15.5mm) adhesive mylar label terminal screw 1.125 ? (30.2mm) unprotected side protected side 1 2 gnd 3 4 1 2 gnd 3 4 (line input terminal) data line from outside world (equipment terminal) to transmit/receive circuits earth ground earth ground note: both ground terminals are common. use second ground wire to reduce impedance on long runs to earth ground connections terminal strip
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