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Gas Discharge Tubes
ORDERING INFORMATION
1021 B
SL
Voltage
Pin Configuration
Failsafe Optio
F=Plastic
S=Solder
n
C=Core
R=Leaded
GreentubeTM SL1021B Series Gas Plasma Arresters
3 ELECTRODE GDT
a=TIP
b=RING
e=GROUND
(centre electrode)
GRAPHICAL SYMBOL
a
b
e
High Performance Beta Range
8.0+
_0.2
9.5 MAX
1.0+
_0.2
All dimensions in mm
The SL1021B series offers high levels of performance on fast ris-
ing transients in the domain of 100V/
S to 1KV/
S, which are
those most likely from induced Lightning disturbances. The
SL1021B series also features ultra low capacitance (typically 1pF
or less) and optimised internal geometry which provides low
insertion loss at high frequencies, so are ideal for the protection
of broadband equipment. These devices are extremely robust
and are able to divert a 20,000Amp pulse without destruction.
FEATURES
RoHS
compliant except `RS' suffix
Low insertion loss
Excellent response to fast rising transients.
Ultra low capacitance.
10KA surge capability tested with 8/20
S pulse as defined by
IEC 6100-4-5
20,000 A single shot surge capability tested with 8/20
s
pulse as defined by IEC 6100-4-5
Available with thermal failsafe option (add `F' or `S' suffix to
part number)
Applications:
Broadband equipment.
ADSL equipment.
XDSL equipment.
Satellite and CATV equipment.
General telecom equipment.
Mechanical Specifications:
Weight:
0.63g (0.022 oz.)
Materials:
Electrode Base: Nickel Iron Alloy
Electrode Plating: Bright Sn
Body: Ceramic
Device Marking:
Littelfuse `LF' marking, Voltage and date
code. Blue.
Pb
RoHS
SL1021A xxxC
SL1021B xxxR
SL1021B xxxRF
SL1021B xxxRS
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8
GAS DISCHARGE
TUBES
Gas Discharge Tubes
High Performance Beta Range
GreentubeTM SL1021B Series Gas Plasma Arresters
LITTELFUSE 3 TERMINAL HEAVY DUTY ARRESTER SERIES
TOTALLY NON-RADIOACTIVE, UL RECOGNIZED
(1) Total current through center (ground) electrode, both line electrodes pulsed simultaneously;
half value through respective line terminal to ground.
(2) 100 amps, 10/1000S pulse
(3) 10 shots, A.C. 60 Hz, 1sec. Duration.
(4) 10 shots, 8/20S waveform
(5) either end (line) electrode to centre (ground) electrode
(6) Applies to `C' option devices mounted in a suitable connector with high pressure contacts.
Part Number
SL1021B145
SL1021B150
SL1021B200
SL1021B230
SL1021B250
SL1021B260
SL1021B300
SL1021B350
SL1021B400
SL1021B420
SL1021B450
SL1021B500
DC Voltage
@ 100V/sec
(V)
145
150
200
230
250
260
350
350
400
420
450
500
DC
Breakover
Voltage
Min-Max
(V)
116-174
120-180
150-250
184-276
200-300
210-310
240-360
280-420
320-480
345-500
360-540
400-500
Max
Dynamic
Breakover
Voltage @
100V/s
500
500
350
350
400
420
450
500
550
600
650
750
Max
Alternating
Discharge
Current
1,3,6
(A)
20
20
20
20
20
20
20
20
20
20
20
20
Max
Repetitive
Impulse
Discharge
Current
(kA)
10
10
10
10
10
10
10
10
10
10
10
10
Max
Alternating
Discharge
Current
5
(A)
10
10
10
10
10
10
10
10
10
10
10
10
Max
Impulse
Discharge
Current
(kA)
20
20
20
20
20
20
20
20
20
20
20
20
Life Test
Rating
2
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
100 shots
Max Single
Impulse
Discharge
Current
10/350s
5,6
(kA)
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
V
o
ltage
(V)
Time (ns)
0 200 400 600 800 1000
1200
Max dynamic breakover
voltage
Hold-over voltage
On-State voltage
Voltage vs Time Characteristic
50
45
40
35
30
25
20
15
10
5
0
0 1 2 3 4 5 6
Current
(A)
Time
(s)
1 line to ground
both lines to ground
Time vs. Current for Failsafe
Pb
RoHS
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w w w . l i t t e l f u s e . c o m
Gas Discharge Tubes
0
0
2 5
5 0
7 5
100
125
150
175
200
225
250
50
100
150
200
250
300
350
400
450
500
Time in seconds
Temperature C
Profile for reflow soldering
Solder
T
1
max = 266
o
C
Flow Area
T
1
= 239
o
C
200
300
Tm = 179
o
C
Forced Cooling
Preheating
Area
100
10
20
30
40
Time (seconds)
Temperature (
C)
Profile for wave soldering
Notes:
T
1
max
= Maximum Tab Temperature = 266
o
C
T
1
= Flow Tempearture of Solder = 239
o
C
Tm
= Melting Point of Solder = 179
o
C
Tamb
= 25
o
C
Maximum permissible rate of temperature change = 7
o
C / sec
High Performance Beta Range
GreentubeTM SL1021B Series Gas Plasma Arresters
Pb
RoHS
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