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Ⅰ.Overview of product

The SL1021A450R is a 3-pole gas discharge tube arrester (GDT) from Littelfuse’s SL1021A series, designed for reliable circuit protection. It features high surge current handling capacity and low capacitance, suitable for safeguarding electronic equipment against overvoltage transients.

Ⅱ.Core parameter

Category:Circuit Protection,Gas Discharge Tube Arresters (GDT)

Manufacturer:Littelfuse Inc.

Series:SL1021A

Packaging:Tray

Part Status:Active

Voltage - DC Spark Over (Nom):450 V

Impulse Discharge Current (8/20µs):10000A (10kA)

Number of Poles:3

Mounting Type:Through Hole

Package / Case:Axial Cylinder, 3 Lead (Radial Bend)

Ⅲ.Main characteristics

High Surge Capacity:It can handle an impulse discharge current of 10000A (10kA) at 8/20µs, effectively diverting large surge currents caused by induced lightning or electrical transients without damage.

3-Pole Design:Equipped with 3 poles, it provides comprehensive protection for multi-line circuits, making it suitable for complex electronic systems that require multi-channel overvoltage defense.

Low Capacitance:Features ultra-low capacitance (typically 1pF or less), ensuring low insertion loss at high frequencies and no interference with the normal operation of broadband or high-speed signal equipment.

Stable Spark Over Voltage:With a nominal DC spark over voltage of 450V, it maintains stable electrical parameters, reliably triggering arc discharge only when overvoltage exceeds the safe threshold to protect circuits.

Easy Mounting:Adopts through-hole mounting type and axial cylinder package with 3 radial bend leads, facilitating secure installation on PCBs and improving assembly efficiency in production lines.

Robust Construction:Built with rugged ceramic-metal hermetic sealing, it ensures stable performance in harsh environments and long-term reliability during operation.

RoHS Compliant:Meets RoHS standards, making it environmentally friendly and suitable for use in electronic products that require eco-friendly components.

Ⅳ.Application field

Broadband Equipment:Used in ADSL and xDSL modems to protect internal circuits from overvoltage transients, ensuring stable high-speed internet signal transmission without interference.

CATV Equipment:Installed in satellite TV receivers and cable TV amplifiers to shield against surge damage, maintaining clear signal reception and reliable operation of the equipment.

Telecom Devices:Applied in telephone line splitters and telecom base station auxiliary circuits to protect sensitive components from lightning-induced surges and line transients.

Industrial Controls:Used in industrial control panels and sensor signal lines to prevent overvoltage from damaging control modules, ensuring the stability of industrial production processes.

Consumer Electronics:Integrated into home network routers and set-top boxes to safeguard internal circuits against power grid surges or electrostatic discharges, extending device service life.

Power Supply Units:Installed in AC-DC power adapters for small electronic devices to divert surge currents, protecting the power supply and the connected equipment from overvoltage damage.

Ⅴ.Summary

The SL1021A450R is a high-performance 3-pole GDT from Littelfuse, featuring high surge capacity, low capacitance, and easy mounting. Its reliable overvoltage protection and wide application scenarios make it an ideal choice for safeguarding broadband, telecom, industrial, and consumer electronic equipment.