422elc.pdf

05038
422ELC
Only One Name Means ProTek’Tion™
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
figure 1
typical low capacitance curve
1,000
C - TVS Capactiance - pF
• RS-422 Data Lines
• Digital Process Control Loop
• Long Line Digital Systems
• Digital Transmission
• Telemetry Systems
• Smoke Detector and 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-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
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.R5 9/12
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05038
422ELC
Only One Name Means ProTek’Tion™
typical device characteristics
MAXIMUM RATINGS @ 25°C Unless Otherwise Specified
PARAMETER
SYMBOL
VALUE
UNITS
VOP
±12
Volts
Peak Operating Line Voltage
Operating Line Current
IO
200
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
Storage Temperature
Response Time
ELECTRICAL CHARACTERISTICS PER LINE @ 25°C Unless Otherwise Specified
PART
NUMBER
422ELC
05038.R5 9/12
MAXIMUM
LEAKAGE
CURRENT
maximum
capacitance
r
ohms
@ 12vop
ID
µA
@ 0v, 1mhz
c
pF
12
1
25
MAXIMUM
CLAMPING
VOLTAGE
(8/20µs)
line-line
@ 500A
VC
±volts
MAXIMUM
CLAMPING
VOLTAGE
(8/20µs)
line-gnd
@ 500A
VC
±volts
MAXIMUM
line
throughput
resistance
30.0
30.0
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05038
422ELC
Only One Name Means ProTek’Tion™
package information
installation instructions & DIAGRAM
There are five (5) terminals on the LINE SIDE and five (5) terminals on the EQUIPMENT SIDE of the 422ELC, 4 data lines and one ground. Both grounds are connected
together internally. A single low impedance ground is sufficient. Incoming data lines are cut or disconnected from the equipment to insert the 422ELC product. The
incoming lines are to be connected to the line side terminals as the equipment side lines are connected to the equipment side terminals. The location of the product
should be as close to the equipment as possible. The 422ELC series 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 side for those that require an open circuit failure mode.
Caution: A low DC resistance ground may not be a good 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.
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.
05038.R5 9/12
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05038
422ELC
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
422ELC
Logo, Date Code, Terminal Designations and Part Number
05038.R5 9/12
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05038
422ELC
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.
05038.R5 9/12
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