PMT6250MS Equivalent & Substitute Parts

Part Overview

The PMT6250MS is a Gas Discharge Tube (GDT) rated for 250V DC spark-over voltage with 5kA impulse discharge current capacity in a 3-pole configuration. This component is classified as Obsolete, making identification of suitable alternatives necessary for ongoing system support and new designs. The part features a cylinder no-lead package with three terminals and is ROHS3 compliant.

Substiute Parts

PMT6250MS

Littelfuse Inc.In Stock: 986PMT6250MS Datasheet

Current PartRFQ

SL1003A250SM

Littelfuse Inc.In Stock: 1023SL1003A250SM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PMT6250MS is based on the following critical parameters:

• Voltage - DC Spark Over: 250V nominal (primary electrical requirement)
• Number of Poles: 3-pole configuration (functional requirement)
• Fail Short characteristic: No (safety requirement)
• RoHS3 Compliance: Required for regulatory alignment
• Moisture Sensitivity Level: 1 (Unlimited)

The SL1003A250SM qualifies as a substitute based on matching these core parameters. While the impulse discharge current differs (10kA versus 5kA), this represents an enhanced capability rather than a limitation, as the substitute can handle higher transient currents within the same voltage and pole configuration. The primary difference is the mounting type transition from user-defined to surface mount and package format change from cylinder no-lead to 3-SMD cylinder square end.

Parameter Comparison

Engineering Selection Recommendations

The SL1003A250SM is the manufacturer-recommended substitute for the PMT6250MS. Both components are manufactured by Littelfuse Inc. and maintain identical voltage and pole specifications. The substitute part carries Active product status, ensuring continued availability and supply chain support compared to the Obsolete status of the main part.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), supporting deployment in standard industrial and commercial environments. The transition from user-defined mounting to surface mount technology reflects modern manufacturing practices while preserving the core electrical protection function.

The increased impulse discharge current rating (10kA versus 5kA) in the substitute provides enhanced transient protection capability without compromising compatibility with the 250V spark-over specification.

Frequently Asked Questions (FAQ)

Q: Can the SL1003A250SM directly replace the PMT6250MS in existing designs?

A: Electrical compatibility is confirmed for the 250V spark-over voltage and 3-pole configuration. However, the mounting type differs (surface mount versus user-defined), requiring PCB layout and assembly process evaluation. The package format change from cylinder no-lead to 3-SMD cylinder square end necessitates mechanical verification.

Q: What is the significance of the higher impulse discharge current in the substitute?

A: The SL1003A250SM rated at 10kA provides greater transient current handling compared to the 5kA rating of the PMT6250MS. This represents an enhanced capability that does not compromise the 250V spark-over voltage specification and maintains the fail-short characteristic.

Q: Are both parts RoHS compliant?

A: Both the PMT6250MS and SL1003A250SM are ROHS3 compliant, supporting regulatory requirements for electronic component deployment.

Q: Why is the main part listed as Obsolete?

A: The PMT6250MS carries Obsolete status, indicating discontinued manufacturing. The SL1003A250SM maintains Active status, ensuring ongoing availability for new procurements and system support.

Q: What are the key parameters that determine substitution eligibility?

A: Voltage rating (250V), number of poles (3), fail-short characteristic (No), and compliance certifications (ROHS3) are the primary parameters governing substitution. The impulse discharge current and mounting type represent secondary considerations based on application requirements.