Gas Discharge Tubes
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/12/17
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.
SL1021A/B Series:
SL1021A/B series GDTs are designed to offer high
levels of performance on fast rising transients in the
range of 100V/μS to 1KV/μS, which are those most
likely created by induced lightning disturbances.
These devices feature ultra low capacitance (typically
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 20,000 Amp pulse without destruction.
These series offer optimized internal geometry which
provide low insertion loss at high frequencies, ideal
for the protection of broadband and other high speed
transmission equipment.
Features
• RoHS compliant
• Low insertion loss
• Excellent response to
fast rising transients
• Ultra low capacitance
• 10KA (A suffix devices) /
20KA (B suffix devices)
surge capability tested
with 8/20μs pulse as
defined by IEC 61000-4-5
• Available with thermal
failsafe option (add ‘F’
suffix to part number)
Applications
SL1021:
• Broadband equipment
• ADSL equipment
• XDSL equipment
• Satellite and CATV
equipment
• Splitters
• General telecom
equipment
• Telecom network
interfaces
• Telephone line cards
• Repeaters
• Modems
• Line test equipment
AGENCY AGENCY FILE NUMBER
E128662
Agency Approvals
3 Electrode GDT Graphical Symbol
a
e
ba = TIP
b = RING
e = GROUND
(center electrode)
Product Characteristics
Materials Dull Tin Plate 17.5 ± 12.5 Microns.
with ceramic insulator
Product Marking
‘LF’ mark, voltage& date code:
SL1021A - Red/White text
SL1021B - Blue/White text
Glow to arc
transition current ~ 1Amp
Glow Voltage
~60-200 Volts
Storage and Operation
Temperature
-40 to +90°C
Transverse Voltage
(Delay Time)
< 0.2µSec (Tested to ITU-T Rec. K.12)
Arc Voltage
~10 to 35 Volts
Holdover Voltage
<150mS (Tested to ITU-T Rec. K.12)
SL1021A/B Series