Features

severe current surges

currents in excess of 10,000 amperes

flat surface or to Din 1 (TS-32) or DIN-3

(TS-35) rail

may be either grounded or not grounded at

the protector

1800 Series – Signal and Dataline Protector

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.

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

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.

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

INTERFACE OPERATING

CHARACTERISTICS

Peak

Max.

Signal

Data

Voltage

Rate

L/L

L/G

BASE

MODEL

NUMBER

(see below

for Clamp

designation)

PROTECTIVE CHARACTERISTICS

Peak Clamping Voltages

LOAD

CURRENT

TYPICAL

CAPACITANCE

L/G

L/L

SERIES

RESISTANCE

Each Line L/L

(Input to output)

@ 5000 Amps,

8x20 μsec

Surge and Voltage

Rate-of-Rise of

100 kV / μsec

L/L

L/G

@ 1000 Amps,

8x20 μsec

Surge and Voltage

Rate-of-Rise of

500 V / μsec

L/L

L/G

(Volts) (Volts)

(MHz)

(Volts)

(Volts)

(Volts)

(Volts)

(mA)

(pF)

(pF)

(Ohms)

20

10

10

1810-10-XX

50

25

42

21

220

2200

1200

10

10

10

4

1820-10-XX

25

25

21

21

220

3300

3300

10

20

10

50

1811-10-XX

60

30

52

26

350

45

45

10

10

10

50

1821-10-XX

30

30

26

26

350

65

65

10

30

15

8

1810-15-XX

70

35

56

28

180

1500

750

15

15

15

3

1820-15-XX

35

35

28

28

180

2300

2300

15

30

15

45

1811-15-XX

80

40

64

32

300

45

45

15

15

15

45

1821-15-XX

40

40

64

32

300

65

65

15

56

28

9

1810-28-XX

110

55

90

45

150

1100

600

22

28

28

4

1820-28-XX

55

55

45

45

150

1800

1800

22

56

28

40

1811-28-XX

120

60

45

45

250

45

45

22

28

28

40

1821-28-XX

60

60

45

45

250

65

65

22

100

50

10

1810-50-XX

178

89

156

89

100

500

300

51

50

50

4

1820-50-XX

89

89

45

45

100

800

800

51