422ELC

05038 Only One Name Means ProTek’Tion™ 422ELC DIGITAL PROCESS DATA LINE PROTECTOR 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 common-mode (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. 422ELC 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). APPLICATIONS • • • • • • RS-422 Data Lines Digital Process Control Loop Long Line Digital Systems Digital Transmission Telemetry Systems Smoke Detector and Fire Alarm Systems 1,000 FIGuRE 1 TyPICAL LOw CAPACITANCE CuRvE 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 (LineGnd) & 48A, Level 4 (Line-Line) • 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 C - TvS Capactiance - pF Industry Standard Low Capacitance TVS Protector 100 ProTek Device 10 0 1 2 3 4 v(OP) - Circuit Operating - volts 5 MEChANICAL ChARACTERISTICS • Approximate Weight: 142 grams • Flammability Rating UL 94V-0 05038.R4 12/10 Page 1 www.protekdevices.com 05038 Only One Name Means ProTek’Tion™ 422ELC TyPICAL DEvICE ChARACTERISTICS MAXIMuM RATINGS @ 25°C unless Otherwise Specified PARAMETER Peak Operating Line Voltage Operating Line Current Transient Voltage Transient Current - 8/20µs waveform Transient Current - 8/20µs waveform Operating Temperature Storage Temperature Response Time SyMBOL VOP IO TA TSTG - vALuE ±12 200 20 10 40 -55 to 100 -55 to 100