485elc

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.R5 9/12
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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.R5 9/12
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
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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.R5 9/12
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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.R5 9/12
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05039
485ELC
Only One Name Means ProTek’Tion™
company information
COMPANY PROFILE
In business more than 20 years, ProTek Devices™ is a privately-held company located in Tempe, Arizona, that offers a product line of transient voltage suppressors (TVS); avalanche breakdown diodes; steering diode TVS arrays and other surge suppressor component products.
These TVS devices protect electronic systems from the effects of lightning, electrostatic discharge (ESD), nuclear electromagnetic pulses
(NEMP), inductive switching and EMI / RFI. ProTek Devices also offers high performance interface and linear products that include analog
switches; multiplexers; LED drivers; audio control ICs; RF and related high frequency products. The analog devices work in a host of consumer; industrial; automotive and other applications.
CONTACT US
Corporate Headquarters
2929 South Fair Lane
Tempe, Arizona 85282
USA
By Telephone
General: 602-431-8101
Sales: & Marketing: 602-414-5109
Customer Service: 602-414-5114
Product Technical Support: 602-414-5107
By Fax
General: 602-431-2288
By E-mail:
Sales: [email protected]
Customer Service: [email protected]
Technical Support: [email protected]
ProTek Devices (Asia Pacific) Pte. Ltd.
8 Ubi Road 2, #06-19
Zervex
Singapore - 408538
Tel: +65-67488312
Fax: +65-67488313
Web
www.protekdevices.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.R5 9/12
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