Gas Discharge Tube (GDT) Products
SL1021A/B Series
SL1021A/B Series
Description
GDT circuit protection devices dissipate electrical
surge energy safely within a contained plasma gas.
Commonly used to help protect sensitive telecom and
networking equipment and lines, GDTs protect from
damage that may result from lightning strikes and
equipment switching operations.
The Littelfuse GDT series described in this document
are available in a variety of leaded and surface mount
forms and offered with and without optional fail-
safe clip. Please refer to the electrical specifications,
dimension and packaging options section of this
document for additional information.
Agency Approvals SL1021A/B Series:
SL1021A/B series GDTs are designed to offer high
AGENCY AGENCY FILE NUMBER
levels of performance on fast rising transients in the
range of 100V/S to 1KV/S, which are those most
E128662
likely created by induced lightning disturbances.
These devices feature ultra low capacitance (typically
3 Electrode GDT Graphical Symbol
1.5pF or less) and are extremely robust with SL1021A
devices able to divert a 10,000 Amp pulse without
destruction, and SL1021B suffix devices able to divert
a b a = TIP
a 20,000 Amp pulse without destruction.
b = RING
These series offer optimized internal geometry which
e = GROUND
(center electrode) provide low insertion loss at high frequencies, ideal
for the protection of broadband and other high speed
e
transmission equipment.
Features
Product Characteristics
RoHS compliant 10KA (A suffix devices) /
Dull Tin Plate 17.5 12.5 Microns.
20KA (B suffix devices)
Low insertion loss Materials
with ceramic insulator
surge capability tested
Excellent response to
with 8/20s pulse as LF mark, voltage& date code:
fast rising transients
Product Marking SL1021A - Red/White text
defined by IEC 61000-4-5
SL1021B - Blue/White text
Ultra low capacitance
Available with thermal
Glow to arc
~ 1Amp
failsafe option (add F
transition current
suffix to part number)
Glow Voltage ~60-200 Volts
Storage and Operation
Applications
-40 to +90C
Temperature
SL1021: Telecom network
Transverse Voltage
< 0.2Sec (Tested to ITU-T Rec. K.12)
interfaces
(Delay Time)
Broadband equipment
Telephone line cards
ADSL equipment Arc Voltage ~10 to 35 Volts
Repeaters
XDSL equipment
Holdover Voltage <150mS (Tested to ITU-T Rec. K.12)
Modems
Satellite and CATV
equipment Line test equipment
Splitters
General telecom
equipment
2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/31/15Gas Discharge Tube (GDT) Products
SL1021A/B Series
Electrical Characteristics
Device Specifications (at 25C) Life Ratings
DC DC AC Surge Max
Insulation
DC Voltage
Capaci- Max Single Surge Life
Part Voltage Voltage Current Current Single
Resistance
100V/Sec.
tance Surge 10/1000
Number 100 V/ 1kV/ 50Hz 8/20Sec Surge
1 1
(@1Mhz) 10/350Sec Secx300
1 1 1
MIN TYP MAX MIN
Sec. Sec. 1Sec.x10 x10 8/20Sec
SL1021B075
60 75 90
10 2
650 >10 4kA
3
SL1021A090
(at 50V) 5kA
72 90 108
SL1021B090
SL1021A145
116 145 174
SL1021B145
500
SL1021A150
600
120 150 180
SL1021B150
SL1021A200 150 200 250
SL1021A230
184 230 276 450
SL1021B230
650
SL1021A250
200 250 300 500
SL1021B250
SL1021A260 2 2
10kA 15kA
210 260 310 550 700
SL1021B260 <1.5pF 10Amps 200Amps
3 3
20kA 25kA
10 2
SL1021A300 >10 2.5kA
240 300 360 650 850
3
SL1021B300
(at 100V) 5kA
SL1021A350
280 350 420 700 900
SL1021B350
SL1021A400
320 400 480
SL1021B400
850 950
SL1021A420
345 420 500
SL1021B420
SL1021A450
360 450 540 900 1000
SL1021B450
SL1021A500
400 500 600 950 1100
SL1021B500
SL1021A600 480 600 720 1000 1200
NOTES:
1. Total current through centre electrode, tested in accordance with ITU-T Rec K.12
2. SL1021A series
3. SL1021B series
2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/31/15