Littelfuse RHE600 Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse RHE600 is a polymeric PTC resettable fuse rated for 16V, 6A hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical performance characteristics and mechanical compatibility to ensure direct replacement capability in existing circuit designs.

Substiute Parts

RHE600

Littelfuse Inc.In Stock: 850RHE600 Datasheet

Current PartRFQ

RHEF600

LittelfuseIn Stock: 1625RHEF600 Datasheet

DirectRFQ

MF-RHT600-0

Bourns Inc.In Stock: 2511MF-RHT600-0 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RHE600 are qualified based on the following critical parameters:

• Voltage rating of 16V maximum
• Hold current (Ih) of 6A maximum
• Trip current (It) of 10.8A
• Maximum current capacity of 100A
• Trip time of 5 seconds
• Initial resistance minimum of 13 mOhms
• Through-hole radial disc mounting configuration
• Physical dimensions: 0.441" L x 0.118" W (11.20mm x 3.00mm)
• Lead spacing within tolerance of 0.199" to 0.201" (5.05mm to 5.10mm)

Parts meeting these specifications are electrically and mechanically interchangeable. Post-trip resistance values may vary within acceptable limits for polymeric PTC fuse technology without affecting circuit protection function.

Parameter Comparison

Engineering Selection Recommendations

Both RHEF600 and MF-RHT600-0 are qualified substitutes for the obsolete RHE600 based on matching electrical and mechanical specifications.

RHEF600 (Littelfuse) is the direct manufacturer equivalent, maintaining the same product lineage within the PolySwitch® series. This part carries active product status and ROHS3 compliance certification. The RHEF600 is available in higher inventory quantities (1615 pcs) and represents the primary substitution path for RHE600 applications.

MF-RHT600-0 (Bourns Inc.) provides an alternative from a different manufacturer within the Multifuse® product family. This part meets identical electrical specifications and includes AEC-Q200 automotive qualification rating. Lead spacing tolerance is 0.201" (5.10mm), which is within acceptable mechanical compatibility limits. The MF-RHT600-0 offers the highest available inventory (2464 pcs).

Both substitutes are ROHS3 compliant, addressing environmental regulatory requirements that the obsolete RHE600 does not meet. Selection between these two options depends on supply chain preferences, inventory availability, and any existing design qualifications for either manufacturer's product line.

Frequently Asked Questions (FAQ)

Q: Can RHEF600 or MF-RHT600-0 be used as direct replacements for RHE600 in existing designs?

A: Yes. Both parts meet all critical electrical parameters (16V, 6A hold current, 10.8A trip current, 5-second trip time) and mechanical specifications (through-hole radial disc mounting, 11.20mm x 3.00mm dimensions). Lead spacing tolerance of 0.199" to 0.201" is within acceptable PCB hole pattern compatibility.

Q: What is the difference between RHEF600 and MF-RHT600-0?

A: Both parts are electrically equivalent. RHEF600 is manufactured by Littelfuse and represents the direct successor to the RHE600 within the same product family. MF-RHT600-0 is manufactured by Bourns and includes AEC-Q200 automotive qualification. Post-trip resistance values differ slightly (32 mOhms vs. 21.5 mOhms) but remain within acceptable operating ranges for polymeric PTC fuse technology.

Q: Are there any compliance differences between the main part and substitutes?

A: Yes. The RHE600 is RoHS non-compliant. Both RHEF600 and MF-RHT600-0 are ROHS3 compliant, meeting current environmental regulatory requirements. If RoHS compliance is required for your application, either substitute part is suitable.

Q: Does lead spacing tolerance affect PCB compatibility?

A: Lead spacing varies from 0.199" (5.05mm) for RHE600 and RHEF600 to 0.201" (5.10mm) for MF-RHT600-0. This 0.002" (0.05mm) difference is within standard PCB hole tolerance and does not affect mechanical fit or electrical performance.

Q: Which substitute part should be selected for new designs?

A: For new designs, either RHEF600 or MF-RHT600-0 is acceptable based on electrical and mechanical equivalence. Selection criteria should include supply chain availability, existing manufacturer qualifications, and any specific certifications required by your application (such as AEC-Q200 for automotive use).