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05039
485ELC
Only One Name Means ProT ek'TionTM
HIGH SPEED ETHERNET DA A LINE PROTECTOR T
APPLICA TIONS Ethernet - 10/100 Base T Catagory 5 Systems RS-485 Serial Communication Lines ISDN Equipment/Systems Video Transmission Systems Smoke Detector & Fire Alarm 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 485ELC
FIGURE 1 LINEAR CAPACITANCE VS NON-LINEAR CAPACITANCE
1,000
LOW CAPACITANCE - 25PF Designed for EIA Standard RS-485 Data Lines Permanent Two-Stage 2 Line Pair Protector Subnanosecond Response Time Common & Differential Mode Protection Automatic Reset - Does Not Interrupt Service Effective Against Lightning, Inductive Switching and ESD
MECHANICAL CHARACTERISTICS Weight: 142 grams (Approximate) Flammability Rating UL 94V-0 Device Marking: Logo, Date Code, Terminal Designations & Part Number
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 interruption of service. 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 nonlinear, distortion, loss of data or access to the I/O port can occur (See Figure 1).
C - Capacitance - pF
Industry Standard Low Capacitance Solid State Protector
100
ProTek's 485ELC
1,0 0 2 4 6 8 10 VOP - Data Line Operating Voltage - Volts
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485ELC
DEVICE CHARACTERISTICS MAXIMUM RATINGS @ 25C
Peak Operatiing Line Voltage (VOP) 7V 250mA Operating Line Current (IO) Maximum Transient Voltage Maximum Transient Current (8/20s waveform) Operating & Storage Temperature Response Time 20kV 10kA/Wire 40kA/Protector -55C to 100C < 1 nanosecond
ELECTRICAL CHARACTERISTICS @ 25C
MAXIMUM CLAMPING VOLTAGE (8/20s) @ 500A VC VOLTS 20 MAXIMUM LINE THRUPUT RESISTANCE R OHMS 12 MAXIMUM LEAKAGE CURRENT @ 7VOP ID A 10 MAXIMUM CAPACITANCE
@ 0-7V, 1MHz C pF 25
INST ALLA TION 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 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 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. For these applications, an additional protector may be necessary at the equipment interface.
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485ELC
PACKAGE OUTLINE & DIMENSIONS
485ELC Case Outline
3.8" MAX (95.5mm) 3.25"0.015" (82.6mm0.38mm)
WARNING:
INSTALLATION DIAGRAM
Unprotected Side Protected Side
(Line Input Terminal) Data Line From Outside World (Equipment Terminal) To Transmit/Receive Circuits
4
3
LINE
GND
1
1.125" (30.2mm)
2
4 3 EQUIPMENT GND 2 1
1 2 GND 3 4
1 2 GND 3 4
2.25" MAX (57.2mm)
Adhesive Mylar Label
Terminal Screw
Mounting Hole for #8 Screw
Terminal Strip
#6 Screw 1.19" MAX (30.2mm)
Earth Ground
Earth Ground
Note: Both ground terminals are common. Use second ground wire to reduce impedance on long runs to earth ground connections
0.61" MAX (15.5mm)
COPYRIGHT (c) 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.
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
www.protekdevices.com
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