SL1024A420R Gas Discharge Tube Equivalent & Substitute Parts

Part Overview

The SL1024A420R is a 3-pole gas discharge tube (GDT) rated for 420V DC spark-over voltage with 10kA 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 SL1024A420R is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

SL1024A420R

Littelfuse Inc.In Stock: 818SL1024A420R Datasheet

Current PartRFQ

SL1021A420R

Littelfuse Inc.In Stock: 1827SL1021A420R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1024A420R 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
• Mounting Type: Through Hole
• Package / Case: Axial Cylinder, 3 Lead (Radial Bend)
• Fail Short Characteristic: No

The SL1021A420R meets all substitution criteria. Both parts are manufactured by Littelfuse Inc., share identical electrical ratings, mechanical configuration, and environmental compliance specifications. The primary distinction is product status: SL1024A420R is obsolete while SL1021A420R is active production.

Parameter Comparison

Engineering Selection Recommendations

The SL1021A420R is the direct substitute for the obsolete SL1024A420R. Both components are manufactured by Littelfuse Inc. and carry identical electrical performance specifications, mechanical dimensions, and environmental compliance certifications.

Selection of SL1021A420R is supported by:

• Active product status ensuring long-term availability and supply chain continuity
• ROHS3 compliance meeting current regulatory requirements
• Identical spark-over voltage and impulse discharge current ratings
• Matching through-hole mounting configuration and axial cylinder package
• EAR99 export classification and HTSUS tariff code alignment

Frequently Asked Questions (FAQ)

Q: Can SL1021A420R be used as a direct replacement for SL1024A420R in existing designs?

A: Yes. The SL1021A420R is electrically and mechanically equivalent to the SL1024A420R. Both components share identical 420V spark-over voltage, 10kA impulse discharge current rating, 3-pole configuration, and through-hole axial cylinder package. No circuit modifications are required.

Q: What is the difference between SL1024A420R and SL1021A420R?

A: The primary difference is product status. SL1024A420R is obsolete; SL1021A420R is in active production. All electrical parameters, mechanical specifications, and compliance certifications are identical.

Q: Are there packaging differences between these parts?

A: Both parts use the same Axial Cylinder, 3 Lead (Radial Bend) package configuration suitable for through-hole mounting. Packaging format may differ (SL1024A420R may be supplied in alternative packaging; SL1021A420R is supplied in Tray), but the component itself is identical.

Q: Do both parts meet current RoHS requirements?

A: Yes. Both SL1024A420R and SL1021A420R are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Is SL1021A420R available in stock?

A: SL1021A420R is in active production status with documented inventory availability. SL1024A420R is obsolete and may have limited stock.