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05046.R4 12/10

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422B - 422E

DATA PROCESS LINE PROTECTOR

DESCRIPTION

The 422B/E is a 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 422B/E is designed to protect data lines from differential (line to line) and common mode (line to ground) tran-

sients. 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.

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.

FEATuRES

• Compatible with IEC 61000-4-2 (ESD): Air - 15kV, Contact - 8kV

• Compatible with IEC 61000-4-4 (EFT): 40A - 5/50ns

• Compatible with IEC 61000-4-5 (Surge): 95A, 8/20µs, Level 4 (Line-

Gnd) & 48A, Level 4 (Line-Line)

• 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

• Approximate Weight: 28 grams (422B) & 142 grams (422E)

• Flammability Rating UL 94V-0

APPLICATIONS

• Data Processing Equipment

• Long Line Transmission Systems

• Control Processing Computers

• Building Management Systems

422B

422E