05039 485ELC Only One Name Means ProTek’Tion™ HIGH SPEED ETHERNET DATA LINE PROTECTOR 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 commonmode (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. 485ELC Capacitance over the operating voltage range is important. If capacitance is non-linear, distortion, loss of data or access to the I/O port can occur (See Figure 1). applications figure 1 typical low capacitance curve 1,000 C - TVS Capactiance - pF • 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 (LineGnd) & 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 Industry Standard Low Capacitance TVS Protector 100 ProTek Device 10 Mechanical characteristics 0 1 2 3 4 V(OP) - Circuit Operating - Volts 5 • Approximate Weight: 142 grams • Flammability Rating UL 94V-0 05039.R4 12/10 Page 1 www.protekdevices.com 05039 485ELC Only One Name Means ProTek’Tion™ typical device characteristics MAXIMUM RATINGS @ 25°C Unless Otherwise Specified PARAMETER SYMBOL VALUE UNITS VOP ±7 Volts Operating Line Current IO 250 mA Transient Voltage - 20 kV/Wire Transient Current - 8/20µs waveform - 10 kA/Wire Transient Current - 8/20µs waveform - 40 kA/Wire Operating Temperature TA -55 to 100 °C TSTG -55 to 100 °C - <1 ns Peak Operating Line Voltage Storage Temperature Response Time ELECTRICAL CHARACTERISTICS PER LINE @ 25°C Unless Otherwise Specified PART NUMBER 485ELC 05039.R4 12/10 MAXIMUM LEAKAGE CURRENT maximum capacitance r ohms @ 7vop ID µA @ 0-7v, 1mhz c pF 12 10 25 MAXIMUM CLAMPING VOLTAGE (8/20µs) line-line/line-gnd @ 500A VC ±volts MAXIMUM line thruput resistance 20.0 Page 2 www.protekdevices.com 05039 485ELC Only One Name Means ProTek’Tion™ package information installation instructions & DIAGRAM 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, fusible 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. PROTECTED SIDE 1 1 2 2 GND GND 3 3 4 4 Earth Ground (Equipment Terminal) To Transmit/Receive Circuits (Line Input Terminal) Data Line from Outside World UNPROTECTED SIDE Earth Ground Note: Both ground terminals are common. Use second ground wire to reduce impedance on long runs to earth ground connections. 05039.R4 12/10 Page 3 www.protekdevices.com 05039 485ELC Only One Name Means ProTek’Tion™ package information outline dimensions dim millimeters inches min max min max A - 95.5 - 3.8 B 82.22 82.98 3.235 3.265 C - 57.2 - 2.25 D - 30.2 - 1.125 E - 15.5 - 0.61 F - 30.2 - 1.19 A 3 3 WARNING 4 4 B LINE GND EQUIPMENT GND 2 2 C D Terminal Strip 1 1 Adhesive Mylar Label Terminal Screw #6 Screws Mounting Hole for #8 Screw F E ORDERING INFORMATION base PART NUMBER MARKING 485ELC Logo, Date Code, Terminal Designations and Part Number 05039.R4 12/10 Page 4 www.protekdevices.com 05039 485ELC Only One Name Means ProTek’Tion™ company information COMPANY PROFILE ProTek Devices, based in Tempe, Arizona USA, is a manufacturer of Transient Voltage Suppression (TVS) products designed specifically for the protection of electronic systems from the effects of lightning, Electrostatic Discharge (ESD), Nuclear Electromagnetic Pulse (NEMP), inductive switching and EMI/RFI. With over 25 years of engineering and manufacturing experience, ProTek designs TVS devices that provide application specific protection solutions for all electronic equipment/systems. ProTek Devices Analog Products Division, also manufactures analog interface, control, RF and power management products. CONTACT US Corporate Headquarters 2929 South Fair Lane Tempe, Arizona 85282 USA By Telephone General: 602-431-8101 Sales: 602-414-5109 Customer Service: 602-414-5114 By Fax General: 602-431-2288 By E-mail: Sales: [email protected] Customer Service: [email protected] Technical Support: [email protected] Web www.protekdevices.com www.protekanalog.com COPYRIGHT © ProTek Devices 1998 - This literature is subject to all applicable copyright laws and is not for resale in any manner. SPECIFICATIONS: ProTek reserves the right to change the electrical and or mechanical characteristics described herein without notice. 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 makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ProTek assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability without limitation special, consequential or incidental damages. LIFE SUPPORT POLICY: ProTek Devices products are not authorized for use in life support systems without written consent from the factory. 05039.R4 12/10 Page 5 www.protekdevices.com