GTCR37-261M-P10-FS Gas Discharge Tube Equivalent & Substitute Parts

Part Overview

The GTCR37-261M-P10-FS is a 3-pole gas discharge tube (GDT) manufactured by Littelfuse Inc., rated for 260V DC spark-over voltage with 10kA impulse discharge current. This component is designed for overvoltage protection in through-hole applications with radial cylinder configuration. The product is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations.

Substiute Parts

GTCR37-261M-P10-FS

Littelfuse Inc.In Stock: 1062GTCR37-261M-P10-FS Datasheet

Current PartRFQ

2026-25-C2F

Bourns Inc.In Stock: 8022026-25-C2F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the GTCR37-261M-P10-FS is determined by the following critical parameters:

• Number of Poles: Must be 3-pole configuration
• Mounting Type: Must be through-hole
• Fail Mode: Must be short-circuit fail mode
• Voltage Range: Spark-over voltage within ±20% tolerance band (208V to 312V acceptable)
• Impulse Discharge Current: Minimum 10kA capability required
• Package Configuration: Radial or axial cylinder with 3-lead configuration

The substitute part 2026-25-C2F meets these criteria with a 250V spark-over rating (within the ±20% tolerance window) and 20kA impulse discharge current capability, exceeding the minimum discharge current requirement.

Parameter Comparison

Engineering Selection Recommendations

The 2026-25-C2F from Bourns Inc. is functionally equivalent to the obsolete GTCR37-261M-P10-FS based on matching pole configuration, fail mode, mounting type, and spark-over voltage within tolerance specifications. The substitute provides higher impulse discharge current (20kA versus 10kA), which represents enhanced protection capability.

Selection considerations based on provided compliance data:

• The main part is RoHS3 compliant and REACH unaffected; the substitute is RoHS non-compliant and REACH affected. Applications subject to RoHS3 or REACH regulatory requirements must account for these compliance differences.
• The substitute is currently in active production status, ensuring availability for ongoing procurement.
• Package configuration differs (radial cylinder versus axial cylinder with radial bend); PCB layout and lead spacing must be verified for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 2026-25-C2F directly replace the GTCR37-261M-P10-FS?

A: The 2026-25-C2F meets the functional substitution criteria: 3-pole configuration, through-hole mounting, short fail mode, and spark-over voltage within the ±20% tolerance band. Physical package differences (axial versus radial cylinder) require verification of PCB footprint compatibility.

Q: What is the voltage difference between these parts?

A: The main part specifies 260V nominal spark-over; the substitute specifies 250V nominal. Both fall within the ±20% tolerance specification, making them electrically equivalent for overvoltage protection applications.

Q: Does the higher discharge current of the substitute affect compatibility?

A: The 2026-25-C2F provides 20kA impulse discharge current versus the 10kA specification of the main part. This represents increased protection capability and does not create incompatibility; the substitute can handle higher transient currents without degradation.

Q: Are there compliance implications for using the substitute?

A: Yes. The main part is RoHS3 compliant and REACH unaffected. The substitute is RoHS non-compliant and REACH affected. Applications in regulated markets must evaluate whether these compliance differences are acceptable for their specific requirements.

Q: What should be verified before implementing the substitute?

A: Verify PCB footprint compatibility with the axial cylinder, 3-lead (radial bend) package configuration. Confirm that regulatory compliance status (RoHS and REACH) aligns with application requirements.