Features
■ Low peak clamping voltage even during
■ Cable shields are passed through and
may be either grounded or not grounded at
the protector
■ Vibration-proof screw-type clamp terminals
■ Flame-resistant epoxy-filled housing
severe current surges
■ Ability to repeatedly protect against surge
currents in excess of 10,000 amperes
■ Convenient mounting and grounding to any
flat surface or to Din 1 (TS-32) or DIN-3
(TS-35) rail
1800 Series – Signal and Dataline Protector
®
Bourns Model 1800 Series Signal and Dataline Protectors are designed to protect sensitive electronic circuits and components from damaging
surge voltages and currents. Their extremely fast response and low clamping voltages make them particularly suitable for the protection of
signal and data lines associated with computer, data communication, instrumentation, broadcasting and industrial controls. They may be used
directly with EIA standard interfaces RS-232, RS-422, RS-423, RS-485 and with 20 mA and 50 mA instrumentation loops. The Model 1800
Series Signal and Dataline Protectors are fast, rugged and capable of protecting against fast rising voltage transients as well as the severe
current surges associated with lightning discharges.
Method of Operation
®
Bourns Model 1800 Series are heavy-duty, multi-staged protectors. A solid-state section intercepts the leading edge of the surge with sub-
nanosecond response time. Within microseconds a 3-pole common chambered gas tube capable of handling 20,000 ampere lightning
currents operates and crowbars the surge to ground. The protector remains in the crowbar state until the surge has passed and line voltages
return to safe levels, then automatically restores the line to normal operation. There is no need for resetting a breakeror replacing a fuse.
Application
Protectors are generally placed at each end of a signal or data line or current loop. In the case of daisy-chain configurations (such as RS-485),
protectors are placed at each node. The 1820 models provide both line-to-ground and line-to-line protection and are designed to use on differ-
ential signals (such as RS-422 or RS-485) and 4-20 mA current loops. 1810 models provide line-to-ground protection for two separate circuits
and are designed for use on ground referenced signals (such as RS-232) where the return wire is grounded at the protector. The 1811 and 1821
models provide the same protection modes for high frequency applications.
®
Related Bourns Protectors
®
For outdoor applications with 1/2 inch NPT ports (such as field-mounted 4-20 mA transmitters), please refer to Bourns Model 1669 Series
Protector. In this application, the mixed use of a Model 1800 Series Protector at the controller and a Model 1669 Series Protector at the field is
recommended.
Characteristics @ 25 °C
Surge Life
>100 operations with 200 Amps....................................................................................................... 10 x 1000 μsec
>10 operations with 10,000 Amps.................................................................................................... 8 x 20 μsec
DC Leakage Current at Rated L/G Voltage........................................................................................... <10 μAmps
Signal/Data Attenuation at Maximum Data Rate................................................................................... 3 db with 600 Ω termination
Operating Temperature.......................................................................................................................... -40 ºC to + 60 ºC
Response Time...................................................................................................................................... 50 pico-seconds
Wire Size ............................................................................................................................................... 22-14 AWG
PROTECTIVE CHARACTERISTICS
INTERFACE OPERATING
CHARACTERISTICS
BASE
MODEL
NUMBER
Peak Clamping Voltages
LOAD
TYPICAL
SERIES
CURRENT
CAPACITANCE
RESISTANCE
@ 5000 Amps,
@ 1000 Amps,
8x20 μsec
Peak
Max.
Data
Rate
8x20 μsec
Surge and Voltage
Rate-of-Rise of
100 kV / μsec
Signal
Voltage
Surge and Voltage
Rate-of-Rise of
500 V / μsec
(see below
for Clamp
designation)
Each Line L/L
L/L
L/G
L/L
(Volts)
50
L/G
(Volts)
25
L/L
(Volts)
42
L/G
(Volts)
21
L/G
(pF)
2200
3300
45
L/L
(pF)
1200
3300
45
(Input to output)
(Volts) (Volts)
(MHz)
10
4
(mA)
220
220
350
350
180
180
300
300
150
150
250
250
100
100
(Ohms)
10
20
10
20
10
30
15
30
15
56
28
56
28
100
50
10
10
10
10
15
15
15
15
28
28
28
28
50
50
1810-10-XX
1820-10-XX
1811-10-XX
1821-10-XX
1810-15-XX
1820-15-XX
1811-15-XX
1821-15-XX
1810-28-XX
1820-28-XX
1811-28-XX
1821-28-XX
1810-50-XX
1820-50-XX
25
25
21
21
10
50
50
8
60
30
52
26
10
30
30
26
26
65
65
10
70
35
56
28
1500
2300
45
750
2300
45
15
3
35
35
28
28
15
45
45
9
80
40
64
32
15
40
40
64
32
65
65
15
110
55
55
90
45
1100
1800
45
600
1800
45
22
4
55
45
45
22
40
40
10
4
120
60
60
45
45
22
60
45
45
65
65
22
178
89
89
156
45
89
500
800
300
800
51
89
45
51
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
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