1821-28-A3 Bourns Inc., 1821-28-A3 Datasheet
1821-28-A3
Manufacturer Part Number
1821-28-A3
Description
Surge Suppressors SIGNAL AND DATALINE PROTECTOR
Manufacturer
Bourns Inc.
Datasheet
1.1810-28-A3.pdf
(2 pages)
Specifications of 1821-28-A3
Voltage Rating
45 V
Current Rating
250 mA
Operating Temperature Range
- 40 C to + 60 C
Termination Style
Screw
Package / Case
TS-35
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Bourns 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. 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 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 confi gurations (such as RS-485),
protectors are placed at each node. 1820 models provide both line-to-ground and line-to-line protection and are designed to use on differen-
tial 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 fi eld-mounted 4-20 mA transmitters), please refer to Bourns 1669 Series Protector.
In this application, the mixed use of an 1800 Series Protector at the controller and a 1669 Series Protector at the fi eld is recommended.
Surge Life
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
(Volts) (Volts)
Peak
Signal
Voltage
100
Characteristics @ 25 °C
INTERFACE OPERATING
L/L
20
10
20
10
30
15
30
15
56
28
56
28
50
>100 operations with 200 Amps ...................................................................................................... 10 x 1000 µsec
>10 operations with 10,000 Amps ................................................................................................... 8 x 20 µsec
CHARACTERISTICS
L/G
10
10
10
10
15
15
15
15
28
28
28
28
50
50
(MHz)
Data
Rate
Max.
10
50
50
45
45
40
40
10
4
8
3
9
4
4
designation)
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
(see below
for Clamp
NUMBER
MODEL
BASE
Surge and Voltage
(Volts)
110
120
178
Rate-of-Rise of
L/L
@ 5000 Amps,
50
25
60
30
70
35
80
40
55
60
89
100 kV / µsec
8x20 µsec
Features
■
■
■
1800 Series – Signal and Dataline Protector
PROTECTIVE CHARACTERISTICS
Low peak clamping voltage even during
severe current surges
Ability to repeatedly protect against surge
currents in excess of 10,000 amperes
Convenient mounting and grounding to any
fl at surface or to Din 1 (TS-32) or DIN-3
(TS-35) rail
Peak Clamping Voltages
(Volts)
L/G
25
25
30
30
35
35
40
40
55
55
60
60
89
89
(Volts)
Surge and Voltage
L/L
156
Rate-of-Rise of
42
21
52
26
56
28
64
64
90
45
45
45
45
@ 1000 Amps,
500 V / µsec
8x20 µsec
(Volts)
Customers should verify actual device performance in their specifi c applications
L/G
21
21
26
26
28
28
32
32
45
45
45
45
89
45
CURRENT
LOAD
(mA)
220
220
350
350
180
180
300
300
150
150
250
250
100
100
■
■
■
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-fi lled housing
Specifi cations are subject to change without notice.
2200
3300
1500
2300
1100
1800
L/G
CAPACITANCE
(pF)
500
800
45
65
45
65
45
65
TYPICAL
1200
3300
2300
1800
(pF)
750
600
300
800
L/L
45
65
45
65
45
65
(Input to output)
Each Line L/L
RESISTANCE
SERIES
(Ohms)
10
10
10
10
15
15
15
15
22
22
22
22
51
51
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1821-28-A3 Summary of contents
Page 1
... 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 fi ...
Page 2
Series – Signal and Dataline Protector Typical Connections Unbalanced Interface, Two Individual Circuits, Such as RS-233 BLDG. 1 P/N 1810 XMTR GND RCVR E1 L1 EQPT. COMMON COMMON AND/OR GND. GND. Balanced or Differential Interface, ...