SL1024B350R Gas Discharge Tube Equivalent & Substitute Parts

Part Overview

The SL1024B350R is a 3-pole gas discharge tube (GDT) rated for 350V DC spark-over voltage with 20kA impulse discharge current capacity. Designed for through-hole mounting in axial cylinder configuration, this component is used for transient overvoltage protection in telecommunications, power distribution, and industrial control applications.

The SL1024B350R is classified as obsolete. Identifying functionally equivalent active alternatives ensures design continuity and supply chain reliability for new production runs and field replacements.

Substiute Parts

SL1024B350R

Littelfuse Inc.In Stock: 835SL1024B350R Datasheet

Current PartRFQ

SL1021B350R

Littelfuse Inc.In Stock: 1662SL1021B350R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1024B350R is determined by strict equivalence across the following critical parameters:

• Voltage - DC Spark Over (Nominal): 350 V
• Impulse Discharge Current (8/20µs): 20000 A (20 kA)
• Number of Poles: 3
• Mounting Type: Through Hole
• Package / Case: Axial Cylinder, 3 Lead (Radial Bend)
• Fail Short Characteristic: No

The SL1021B350R meets all substitution criteria. While classified as active product status (versus obsolete), it maintains identical electrical performance specifications and mechanical compatibility. Packaging format differs (tray versus unspecified for the main part), which does not affect functional equivalence in component-level applications.

Parameter Comparison

Engineering Selection Recommendations

The SL1021B350R is the direct functional equivalent for the obsolete SL1024B350R. Both components are manufactured by Littelfuse Inc. and carry identical electrical and mechanical specifications across all critical parameters.

Selection of the SL1021B350R is supported by:

• Active product status ensuring ongoing availability and manufacturing support
• ROHS3 compliance matching the original part
• Identical voltage and current ratings for direct circuit substitution
• Equivalent mechanical form factor and lead configuration
• MSL rating of 1 (Unlimited) matching storage and handling requirements

No design modifications are required for PCB layouts or circuit implementations when transitioning from SL1024B350R to SL1021B350R.

Frequently Asked Questions (FAQ)

Q: Can the SL1021B350R be used as a direct replacement for the SL1024B350R in existing designs?

A: Yes. The SL1021B350R is electrically and mechanically equivalent. All critical parameters—voltage rating, current capacity, pole configuration, mounting type, and package form—are identical. No circuit or layout changes are necessary.

Q: What is the difference between the SL1024B and SL1021B series?

A: Both series are 3-pole gas discharge tubes rated for 350V and 20kA. The primary difference is product lifecycle status: SL1024B is obsolete, while SL1021B is active. The SL1021B represents the current production equivalent.

Q: Does packaging format affect substitution compatibility?

A: Packaging format (tray versus other formats) does not affect component-level electrical or mechanical performance. The physical form factor and lead configuration remain identical, ensuring PCB compatibility.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant and carry identical MSL ratings. No compliance gaps exist between the two parts.

Q: What inventory considerations should be evaluated?

A: The SL1021B350R has higher current inventory availability (1577 pcs) compared to the SL1024B350R (823 pcs). For new production, the SL1021B350R is the recommended selection due to active product status and supply continuity.