SL1024B420RG Equivalent & Substitute Parts

Part Overview

The SL1024B420RG is a Gas Discharge Tube (GDT) rated for 420V DC spark-over voltage with 20kA impulse discharge current capacity in a 3-pole through-hole configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and procurement planning. The SL1024B420RG series has been superseded by active production alternatives that maintain identical electrical and mechanical specifications.

Substiute Parts

SL1024B420RG

Littelfuse Inc.In Stock: 937SL1024B420RG Datasheet

Current PartRFQ

SL1021B420RF

Littelfuse Inc.In Stock: 2073SL1021B420RF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1024B420RG is determined by strict equivalence across the following critical parameters:

• Voltage - DC Spark Over (Nominal): 420 V
• Impulse Discharge Current (8/20µs): 20000A (20kA)
• Number of Poles: 3
• Fail Short characteristic: Yes
• Mounting Type: Through Hole
• Package / Case: Axial Cylinder, 3 Lead (Radial Bend)
• RoHS Status: ROHS3 Compliant

The SL1021B420RF meets all substitution criteria as a direct functional equivalent. Both components share identical electrical ratings, mechanical form factor, and regulatory compliance status. The primary distinction is product lifecycle status: SL1024B420RG is obsolete while SL1021B420RF is in active production.

Parameter Comparison

Engineering Selection Recommendations

The SL1021B420RF is the direct substitute for the SL1024B420RG. Both components are manufactured by Littelfuse Inc. and maintain identical electrical performance specifications, mechanical packaging, and regulatory compliance certifications. The SL1021B420RF is the recommended selection for new designs and ongoing procurement due to its active production status. For existing systems currently using the SL1024B420RG, the SL1021B420RF provides drop-in compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the SL1021B420RF be used as a direct replacement for the SL1024B420RG?

A: Yes. Both components share identical voltage ratings (420V DC spark-over), impulse discharge current capacity (20kA), pole configuration (3-pole), mounting type (through-hole), and package geometry (Axial Cylinder, 3 Lead with Radial Bend). No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The SL1024B420RG is classified as obsolete. The SL1021B420RF is the active production equivalent from the same manufacturer, ensuring continued availability and supply chain reliability.

Q: Are there any compliance differences between these parts?

A: No. Both components are ROHS3 compliant and share identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance requirements are equivalent.

Q: Does packaging differ between these parts?

A: The electrical and mechanical specifications are identical. The SL1024B420RG is available in standard packaging while the SL1021B420RF is supplied in tray packaging. The component form factor and pin configuration remain unchanged.

Q: Are these parts interchangeable in PCB designs?

A: Yes. The identical through-hole mounting type and axial cylinder package with 3-lead radial bend configuration ensure mechanical and electrical interchangeability in existing PCB layouts.