SH250 Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SH250 is a 2-pole surface mount gas discharge tube (GDT) manufactured by Littelfuse Inc., designed for overvoltage protection applications. Rated at 250V DC spark-over voltage with 5kA impulse discharge current capacity, this component is actively produced and stocked. Substitute parts may be required due to supply chain constraints, regional availability, or specific procurement requirements while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

SH250

Littelfuse Inc.In Stock: 1439SH250 Datasheet

Current PartRFQ

2035-25-SM-RPLF

Bourns Inc.In Stock: 63762035-25-SM-RPLF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SH250 is determined by strict equivalence across the following critical parameters:

• Voltage - DC Spark Over (Nominal): 250 V
• Impulse Discharge Current (8/20µs): 5000A (5kA)
• Number of Poles: 2
• Mounting Type: Surface Mount
• Fail Short Characteristic: No
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute part 2035-25-SM-RPLF manufactured by Bourns Inc. meets all these criteria and is therefore electrically and mechanically equivalent for direct substitution in circuit designs requiring the SH250.

Parameter Comparison

Engineering Selection Recommendations

Both the SH250 and 2035-25-SM-RPLF are active products with full ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection between these parts should be based on availability, lead time, and cost considerations, as both components satisfy identical electrical performance and environmental compliance specifications. The Bourns 2035-25-SM-RPLF includes a specified tolerance of ±15%, whereas the SH250 tolerance is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the 2035-25-SM-RPLF replace the SH250 in existing designs?

A: Yes. Both components share identical voltage rating (250V DC spark-over), discharge current capacity (5kA), pole configuration (2-pole), and mounting type (surface mount). Both are ROHS3 compliant with MSL 1 rating.

Q: Are there package differences between these parts?

A: The SH250 uses a 2-SMD Square End Block package, while the 2035-25-SM-RPLF uses a 2-SMD Cylinder Square End package. Both are surface mount configurations suitable for automated assembly.

Q: What is the significance of the ±15% tolerance specification on the Bourns part?

A: The 2035-25-SM-RPLF specifies ±15% tolerance on its electrical parameters. The SH250 tolerance is not specified in available data. This difference should be evaluated against circuit design requirements for spark-over voltage precision.

Q: Are both parts suitable for high-reliability applications?

A: Both components are actively produced, ROHS3 compliant, and carry MSL 1 (unlimited moisture sensitivity level) ratings, indicating suitability for standard commercial and industrial applications.

Q: What certifications apply to both parts?

A: Both the SH250 and 2035-25-SM-RPLF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component distribution.