SL1024B420RF Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SL1024B420RF is a 3-pole gas discharge tube (GDT) rated for 420V 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 industrial and telecommunications applications.

The SL1024B420RF is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or field replacement requirements.

Substiute Parts

SL1024B420RF

Littelfuse Inc.In Stock: 1089SL1024B420RF Datasheet

Current PartRFQ

SL1021B420RF

Littelfuse Inc.In Stock: 2073SL1021B420RF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SL1024B420RF 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. While it differs in series designation (SL1021B vs. SL1024B) and product status (Active vs. Obsolete), it maintains identical electrical performance, mechanical configuration, and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The SL1021B420RF is the direct substitute for the SL1024B420RF. Both components are manufactured by Littelfuse Inc. and share identical electrical ratings, mechanical form factors, and regulatory certifications.

The SL1021B420RF carries Active product status, ensuring ongoing availability and supply chain support. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), suitable for standard storage and handling conditions.

Selection of the SL1021B420RF eliminates obsolescence risk while preserving full functional and mechanical compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SL1021B420RF be used as a direct replacement for the SL1024B420RF?

A: Yes. Both components share identical voltage ratings (420V DC spark-over), discharge current capacity (20kA), pole configuration (3-pole), mounting type (through-hole), and package geometry (axial cylinder, 3-lead radial bend). No circuit modifications are required.

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

A: The series designation reflects internal Littelfuse product line organization. From an electrical and mechanical standpoint, both series deliver equivalent performance for this voltage and current rating.

Q: Are there any packaging differences between these parts?

A: The SL1024B420RF is supplied in standard packaging, while the SL1021B420RF is supplied in tray packaging. Both use identical component geometry and lead configuration. Tray packaging is standard for active production parts and does not affect electrical or mechanical performance.

Q: Why is the SL1024B420RF classified as obsolete?

A: Obsolescence typically reflects end-of-life status in the manufacturer's product portfolio. The SL1021B420RF represents the current active equivalent, ensuring continued availability and support.

Q: Are both parts RoHS compliant?

A: Yes. Both the SL1024B420RF and SL1021B420RF are ROHS3 compliant and carry MSL 1 (unlimited moisture sensitivity), meeting standard environmental and handling requirements.