485ELC_12 Datasheet, PDF (1/5 Pages) Protek Devices – HIGH SPEED ETHERNET DATA LINE PROTECTOR

Only One Name Means ProTek’Tion™
HIGH SPEED ETHERNET DATA LINE PROTECTOR
485ELC
485ELC
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 non-linear, distortion, loss of data or ac-
cess to the I/O port can occur (See Figure 1).
applications
• Ethernet & Catagory 5 Systems
• RS-485 Serial Communication Lines
• ISDN Equipment/Systems
• Video Transmission Systems
• Smoke Detector & Fire Alarm Systems
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)
• 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
• Approximate Weight: 142 grams
• Flammability Rating UL 94V-0
figure 1
typical low capacitance curve
1,000
Industry
Standard Low
Capacitance TVS
Protector
100
ProTek Device
10
0
1
2
3
4
5
V_(OP) - Circuit Operating - Volts
05039.R5 9/12
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