Littelfuse SL1024AB User Manual

Gas Discharge Tube (GDT) Products

SL1021A/B, SL1024A/B and PMT8 Series

SL1021A/B, SL1024A/B and PMT8 Series

Agency Approvals

AGENCY AGENCY FILE NUMBER

®

3 Electrode GDT Graphical Symbol

a

e

Features

• RoHS compliant

• Low insertion loss

• Excellent response to
fast rising transients

• Ultra low capacitance

Applications

SL1021 / SL1024:

• Broadband equipment

• ADSL equipment

• XDSL equipment

• Satellite and CATV
equipment

• Splitters

• General telecom
equipment

E128662

b

a = TIP
b = RING
e = GROUND
(center electrode)

• 10KA (A suffix devices) /
20KA (B suffix devices)
surge capability tested
with 8/20s pulse as
defined by IEC 61000-4-5

• Available with thermal
failsafe option (add ‘F’
suffix to part number)

PMT8:

• Telecom network
interfaces

• Telephone line cards

• Repeaters

• Modems

• Line test equipment

®

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 fail­safe clip. Please refer to the electrical specifications,
dimension and packaging options section of this
document for additional information.

SL1021A/B and SL1024A/B Series:

SL1021A/B and SL1024A/B series GDTs are designed
to offer high levels of performance on fast rising
transients in the range of 100V/S to 1KV/S, 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 SL102xA
devices able to divert a 10,000 Amp pulse without
destruction, and SL102xB 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.

PMT8 Series:

PMT8 GDT's are telecom grade devices designed to
meet the recommendations in CCITT-K12 and Bellcore
GR-1361-CORE. The three electrode configuration
is used in applications where simultaneous crowbar
action of two signal lines is required.

Product Characteristics

Materials

Product Marking

Glow to arc
transition current

Glow Voltage

Storage and Operation
Temperature

Transverse Voltage
(Delay Time)

Arc Voltage

Holdover Voltage

Dull Tin Plate 17.5 ± 12.5 Microns.
with ceramic insulator

‘LF’ mark, voltage& date code:
SL102xA - Red/White text
SL102xB & PMT8 - Blue/White text

~ 1Amp

~60-200 Volts

-40 to +90°C

< 0.2µSec (Tested to ITU-T Rec. K.12)

~10 to 35 Volts

<150mS (Tested to ITU-T Rec. K.12)

SL1021A/B, SL1024A/B and PMT8 Series

18

Revised: June 28, 2010

Specifications are subject to change without notice.

Customer should verify actual device performance in their specific applications.

Please refer to www.littelfuse.com for current information.

©2010 Littelfuse, Inc.

Gas Discharge Tube (GDT) Products

SL1021A/B, SL1024A/B and PMT8 Series

Electrical Characteristics

Device Specifications (at 25°C) Life Ratings

Part

Number*

DC Voltage

100V/Sec.

MIN TYP MAX MIN

DC

Voltage

100 V/

Sec.

SL1021A090
SL1024A090
SL1021B090
SL1024B090

72 90 108

PMT 8 090

SL1021A145
SL1024A145
SL1021B145

116 145 174

500

SL1024B145

SL1021A150
SL1024A150
SL1021B150

120 150 180

SL1024B150

SL1021A200

150 200 250

SL1021A230
SL1024A230
SL1021B230
SL1024B230

184 230 276 450

PMT 8 230

SL1021A250
SL1024A250
SL1021B250
SL1024B250

200 250 300 500

PMT 8 250

SL1021A260
SL1024A260
SL1021B260

210 260 310 550 700

SL1024B260

SL1021A300
SL1024A300
SL1021B300

240 300 360 650 850

SL1024B300

SL1021A350
SL1024A350
SL1021B350
SL1024B350

280 350 420 700 900

PMT 8 350

SL1021A400
SL1024A400
SL1021B400
SL1024B400
PMT 8 400

320 400 480

850 950

SL1021A420
SL1024A420
SL1021B420

345 420 500

SL1024B420

SL1021A450
SL1024A450
SL1021B450

360 450 540 900 1000

SL1024B450

SL1021A500
SL1024A500
SL1021B500

400 500 600 950 1100

SL1024B500

SL1021A600
SL1024A600

NOTES:
*Max capacitance is 1.5 pF, measured at 1 MHz.

1. Total current through centre electrode, tested in accordance with ITU-T Rec K.12

2. SL A series

3. SL B series & PMT 8 series

480 600 720 1000 1200

DC

Voltage

1kV/

Sec.

650

600

650

Capaci-

tance

(@1Mhz)

<1.5pF

Insulation

Resistance

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AC

Current

50Hz

1Sec.x10

10Amps

1

Surge

Current

8/20Sec

1

x10

10kA
20kA

2

3

Max
Single
Surge

8/20Sec

15kA
25kA

1

2

3

Max Single

Surge

10/350Sec

2

4kA

3

5kA

2

2.5kA

3

5kA

1

Surge Life

10/1000

Secx300

200Amps

1

©2010 Littelfuse, Inc.
Specifications are subject to change without notice.

Please refer to www.littelfuse.com for current information.
Customer should verify actual device performance in their specific applications.

19

Revised: June 28, 2010

SL1021A/B, SL1024A/B and PMT8 Series