SL1024A420RF Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SL1024A420RF is a Gas Discharge Tube (GDT) rated for 420V DC spark-over voltage with 10kA impulse discharge current capacity in a 3-pole through-hole configuration. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The SL1024A420RF series has been superseded by newer product lines while maintaining identical electrical and mechanical specifications.

Substiute Parts

SL1024A420RF

LittelfuseIn Stock: 805SL1024A420RF Datasheet

Current PartRFQ

SL1021A420RF

Littelfuse Inc.In Stock: 752SL1021A420RF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1024A420RF is determined by strict equivalence across the following critical parameters:

• Voltage - DC Spark Over (Nominal): 420 V
• Impulse Discharge Current (8/20µs): 10000A (10kA)
• 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 SL1021A420RF meets all substitution criteria as an active product from Littelfuse Inc., offering identical electrical performance and mechanical compatibility with the obsolete SL1024A420RF.

Parameter Comparison

Engineering Selection Recommendations

The SL1021A420RF is the direct substitute for the obsolete SL1024A420RF. Selection of the SL1021A420RF is supported by:

• Active product status ensuring long-term availability and supply chain continuity
• Full electrical equivalence: 420V DC spark-over voltage and 10kA impulse discharge current
• Identical mechanical configuration: 3-pole through-hole axial cylinder package with radial bend leads
• Equivalent regulatory compliance: ROHS3 certification and MSL 1 rating
• Same fail-short characteristic for circuit protection applications

No additional qualification or testing is required for direct substitution in applications currently using the SL1024A420RF.

Frequently Asked Questions (FAQ)

Q: Can the SL1021A420RF be used as a direct replacement for the SL1024A420RF?

A: Yes. The SL1021A420RF is a direct substitute with identical electrical ratings (420V spark-over, 10kA impulse current), mechanical configuration (3-pole through-hole), and regulatory compliance (ROHS3). The primary difference is product status: SL1024A420RF is obsolete while SL1021A420RF is active.

Q: Are there any differences in packaging between these parts?

A: The SL1024A420RF packaging is listed as standard, while the SL1021A420RF is supplied in Tray packaging. Both parts maintain identical component specifications and through-hole mounting characteristics. Packaging differences do not affect electrical or mechanical compatibility.

Q: What does "Fail Short" mean for these Gas Discharge Tubes?

A: Fail Short indicates that upon component failure, the GDT transitions to a short-circuit state, providing continued electrical path protection. This characteristic is identical in both the SL1024A420RF and SL1021A420RF.

Q: Are both parts RoHS compliant?

A: Yes. Both the SL1024A420RF and SL1021A420RF are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting equivalent environmental and regulatory requirements.

Q: Why is the SL1024A420RF listed as obsolete?

A: Product obsolescence reflects manufacturer lifecycle decisions. The SL1021A420RF represents the active continuation of this product line with identical specifications, ensuring design continuity for applications requiring 420V, 10kA 3-pole gas discharge tube protection.