SL1021B450RG Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SL1021B450RG is a 3-pole gas discharge tube (GDT) rated for 450V DC spark-over voltage with 20kA impulse discharge current capacity. This component is designed for through-hole mounting and provides fail-short protection in surge suppression applications.

The SL1021B450RG is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or field replacement requirements.

Substiute Parts

SL1021B450RG

LittelfuseIn Stock: 797SL1021B450RG Datasheet

Current PartRFQ

SL1021B450RF

Littelfuse Inc.In Stock: 1820SL1021B450RF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SL1021B450RG is determined by strict equivalence across the following critical parameters:

• Voltage - DC Spark Over (Nominal): 450 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 SL1021B450RF meets all substitution criteria. It shares identical electrical ratings, mechanical configuration, and compliance certifications with the obsolete SL1021B450RG. The primary difference is product status (active vs. obsolete) and packaging format (tray vs. reel).

Parameter Comparison

Engineering Selection Recommendations

The SL1021B450RF is the direct functional equivalent for the obsolete SL1021B450RG. Both components are manufactured by Littelfuse, belong to the SL1021B series, and carry identical electrical and mechanical specifications.

The SL1021B450RF holds active product status, ensuring ongoing manufacturer support, availability, and compliance maintenance. It maintains ROHS3 compliance and carries the same MSL rating as the original part.

The only operational difference is packaging format: the SL1021B450RG ships on reel, while the SL1021B450RF ships in tray format. This distinction affects procurement and assembly logistics but does not impact electrical performance or mechanical fit in through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can the SL1021B450RF be used as a direct replacement for the SL1021B450RG in existing designs?

A: Yes. The SL1021B450RF is electrically and mechanically equivalent. Both components share identical voltage ratings (450V DC spark-over), discharge current capacity (20kA), pole configuration (3-pole), fail-short characteristic, and through-hole mounting specifications. No circuit redesign is required.

Q: What is the significance of the product status difference (obsolete vs. active)?

A: The SL1021B450RG is obsolete, meaning Littelfuse no longer manufactures or supports this part number. The SL1021B450RF is active, ensuring continued availability, technical support, and compliance certification maintenance from the manufacturer.

Q: Does the packaging format difference (reel vs. tray) affect component performance?

A: No. Packaging format affects only procurement, storage, and assembly handling. The electrical and mechanical properties of the component itself remain identical regardless of whether it is supplied on reel or in tray format.

Q: Are both parts RoHS compliant?

A: Yes. Both the SL1021B450RG and SL1021B450RF are ROHS3 compliant and carry MSL rating 1 (unlimited moisture sensitivity).

Q: What are the key parameters that define substitution eligibility for this GDT?

A: Substitution is valid when the following parameters match: DC spark-over voltage (450V), impulse discharge current (20kA at 8/20µs), number of poles (3), fail-short characteristic (yes), mounting type (through-hole), and package configuration (axial cylinder, 3-lead radial bend).