SL1024B420C Equivalent & Substitute Parts

Part Overview

The SL1024B420C is a Gas Discharge Tube (GDT) rated for 420V DC spark-over voltage with 20kA impulse discharge current capacity in a 3-pole configuration. This component is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The SL1024B420C maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), making it suitable for industrial surge protection applications.

Substiute Parts

SL1024B420C

LittelfuseIn Stock: 1018SL1024B420C Datasheet

Current PartRFQ

SL1021B420C

Littelfuse Inc.In Stock: 1240SL1021B420C Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SL1024B420C 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
• Package / Case: Cylinder No Lead, 3 Terminal
• Fail Short characteristic: No
• RoHS Status: ROHS3 Compliant

The SL1021B420C meets all substitution criteria as a direct functional equivalent. Both components share identical electrical ratings, mechanical configuration, and regulatory compliance status. The primary distinction is product lifecycle status: SL1024B420C is Obsolete while SL1021B420C is Active, with improved inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The SL1021B420C is the direct substitute for the obsolete SL1024B420C. Both components are manufactured by Littelfuse and maintain identical electrical and mechanical specifications. The SL1021B420C carries Active product status, ensuring long-term availability and continued manufacturer support. Both parts satisfy ROHS3 compliance requirements and carry equivalent regulatory classifications (ECCN: EAR99, HTSUS: 8536.30.8000).

For new designs and ongoing production, the SL1021B420C is the appropriate selection. For legacy system maintenance where original SL1024B420C inventory exists, the SL1021B420C provides seamless functional replacement without circuit redesign or validation requirements.

Frequently Asked Questions (FAQ)

Q: Can the SL1021B420C directly replace the SL1024B420C in existing circuits?

A: Yes. Both components share identical electrical ratings (420V DC spark-over, 20kA impulse discharge current), mechanical configuration (3-pole, cylinder no-lead package), and regulatory compliance. No circuit modification is required.

Q: What is the primary reason for substitution?

A: The SL1024B420C is classified as Obsolete. The SL1021B420C is the Active equivalent, ensuring continued availability and manufacturer support.

Q: Are there packaging differences between these parts?

A: The SL1024B420C packaging is listed as "-" (unspecified), while the SL1021B420C is supplied in Tray packaging. Both maintain the same physical form factor (Cylinder No Lead, 3 Terminal).

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SL1024B420C and SL1021B420C are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating. Both carry identical ECCN and HTSUS classifications.

Q: Which part should be specified for new designs?

A: The SL1021B420C should be specified for new designs due to its Active product status and superior long-term availability.