SL1024A400RG Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SL1024A400RG is a 3-pole gas discharge tube (GDT) rated for 400V DC spark-over voltage with 10kA impulse discharge current capacity. This component is designed for through-hole mounting and provides fail-short protection in overvoltage suppression applications.

The SL1024A400RG is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this protection function remains required.

Substiute Parts

SL1024A400RG

Littelfuse Inc.In Stock: 880SL1024A400RG Datasheet

Current PartRFQ

SL1021A400RF

Littelfuse Inc.In Stock: 1124SL1021A400RF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1024A400RG is determined by strict equivalence across the following critical parameters:

• Voltage Rating: 400V DC spark-over voltage (nominal)
• Discharge Current Capacity: 10kA impulse discharge current (8/20µs waveform)
• Pole Configuration: 3-pole architecture
• Fail Mode: Fail-short protection characteristic
• Mounting Technology: Through-hole configuration
• Physical Package: Axial cylinder with 3 radial-bend leads
• Regulatory Compliance: ROHS3 compliance requirement

The SL1021A400RF meets all these criteria and is therefore a direct functional equivalent for the obsolete SL1024A400RG.

Parameter Comparison

Engineering Selection Recommendations

The SL1021A400RF is the appropriate substitute for the obsolete SL1024A400RG based on the following factors:

Product Status: The SL1021A400RF carries active product status from Littelfuse Inc., ensuring ongoing availability and manufacturing support. The SL1024A400RG is obsolete and no longer in production.

Electrical Equivalence: Both parts share identical electrical specifications: 400V DC spark-over voltage and 10kA impulse discharge current capacity. The 3-pole configuration and fail-short protection mode are identical.

Physical Compatibility: Both components use the same through-hole mounting technology and axial cylinder package with 3 radial-bend leads, enabling direct PCB footprint compatibility without layout modifications.

Regulatory Compliance: Both parts maintain ROHS3 compliance and carry identical ECCN and HTSUS classifications, satisfying supply chain and export documentation requirements.

Packaging Consideration: The SL1024A400RG is supplied in standard packaging, while the SL1021A400RF is supplied in tray packaging. This difference does not affect electrical or mechanical performance and is a standard industry practice for active products.

Frequently Asked Questions (FAQ)

Q: Can the SL1021A400RF be used as a direct replacement for the SL1024A400RG without PCB modifications?

A: Yes. Both components share identical electrical ratings (400V, 10kA), pole configuration (3-pole), mounting type (through-hole), and physical package (axial cylinder, 3 radial-bend leads). No PCB layout changes are required.

Q: What is the primary reason for substitution?

A: The SL1024A400RG is obsolete and no longer manufactured. The SL1021A400RF is the active equivalent from the same manufacturer with identical functional specifications.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, carry MSL rating of 1 (Unlimited), and share the same ECCN (EAR99) and HTSUS (8536.30.8000) classifications.

Q: Does the tray packaging of the SL1021A400RF affect its performance?

A: No. Packaging format is a logistics and handling consideration only. It does not impact electrical performance, reliability, or functional characteristics of the gas discharge tube.

Q: Are both parts manufactured by Littelfuse Inc.?

A: Yes. Both the SL1024A400RG and SL1021A400RF are manufactured by Littelfuse Inc., ensuring consistent quality standards and design heritage.