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05038
422ELC
Only One Name Means ProT ek'TionTM
DIGIT AL PROCESS DA A LINE PROTECTOR T
APPLICA TIONS RS-422 Data Lines Digital Process Control Loop Long Line Digital Systems Digital Transmission Telemetry 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 422ELC
FIGURE 1 LINEAR CAPACITANCE VS NON-LINEAR CAPACITANCE
1,000
LOW CAPACITANCE - 25PF Designed for EIA Standard RS-422 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 422ELC is low capacitance, two-stage transient voltage protector that 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 422ELC is designed to protect data lines from differential (line-line) and commonmode (line-to-ground) transients. Terminals 1 & 2 and 3 & 4 for the 422ELC are designed as line pairs. 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. 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 422ELC
1,0 0 2 4 6 8 10 VOP - Data Line Operating Voltage - Volts
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422ELC
DEVICE CHARACTERISTICS
MAXIMUM RATINGS @ 250C
Peak Operating Line Voltage (VOP) Operating Line Current (IO) Maximum Transient Voltage Maximum Transient Current (8/20s waveform) Operating & Storage Temperature Response Time 12V 200mA 20kV 10kA/Wire 40kA/Protector -55C to 100C < 1 nanosecond
ELECTRICAL CHARACTERISTICS @ 250C Ambient Temperature
MAXIMUM CLAMPING VOLTAGE Line - Line 500A, 8/20s VC VOLTS 30.0 MAXIMUM CLAMPING VOLTAGE Line - Ground 500A, 8/20s VC VOLTS 30.0 MAXIMUM LINE THRUPUT RESISTANCE MAXIMUM LEAKAGE CURRENT @ 12 VOP ID A 1 MAXIMUM CAPACITANCE
R OHMS 12
@ 0V, 1 MHz C pF 25
INST ALLA TION INSTRUCTIONS
There are five (5) terminals on the LINE SIDE and five (5) terminals on the EQUIPMENT SIDE of the 422ELC, 4 data lines and one ground. Both grounds are connected together internally. A single low impedance ground is sufficient. Incoming data lines are cut or disconnected from the equipment to insert the 422ELC product. 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 422ELC 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 a good 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.
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422ELC
PACKAGE OUTLINE & DIMENSIONS
422ELC 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
05038.R3 11/03
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