RHEF650 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RHEF650 is an active polymeric PTC resettable fuse manufactured by Littelfuse, part of the PolySwitch® series. This component provides overcurrent protection with automatic reset capability in through-hole radial disc configuration. The RHEF650 is designed for 16V maximum voltage applications with a 6.5A hold current rating. Finding equivalent substitute parts is necessary to ensure supply chain flexibility, optimize procurement costs, and maintain design continuity when primary components face availability constraints.

Substiute Parts

RHEF650

LittelfuseIn Stock: 962RHEF650 Datasheet

Current PartRFQ

MF-RHT650-0

Bourns Inc.In Stock: 3900MF-RHT650-0 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RHEF650 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 16V maximum
• Current hold rating: 6.5A
• Current trip rating: 12A
• Maximum current: 100A
• Time to trip: 5.5 seconds
• Initial resistance: 11 mOhms minimum
• Post-trip resistance: 26 mOhms maximum
• Operating temperature range: -40°C to 125°C
• Mounting configuration: Through hole radial disc
• Physical dimensions: 0.500" L x 0.118" W with 0.874" maximum seated height
• RoHS3 compliance

The MF-RHT650-0 from Bourns Inc. meets all specified electrical and mechanical parameters, qualifying it as a direct substitute within the polymeric PTC resettable fuse category.

Parameter Comparison

Engineering Selection Recommendations

Both the RHEF650 and MF-RHT650-0 are active products with equivalent electrical and mechanical specifications. The RHEF650 carries CSA, TUV, and UL approvals. The MF-RHT650-0 carries AEC-Q200 qualification and REACH Unaffected status. Selection between these components should be based on specific application requirements regarding regulatory certifications and supply availability. Both components meet ROHS3 compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the MF-RHT650-0 be used as a direct replacement for the RHEF650?

A: Yes. Both components share identical electrical ratings (16V, 6.5A hold current, 12A trip current), identical time-to-trip characteristics (5.5 seconds), identical resistance specifications, and identical physical dimensions in radial disc through-hole configuration. They are functionally equivalent for circuit protection applications within the specified parameters.

Q: Are there differences in lead spacing between these parts?

A: The RHEF650 specifies 0.199" (5.05mm) lead spacing, while the MF-RHT650-0 specifies 0.114" (2.90mm) lead spacing. This difference may affect PCB layout compatibility. Verify lead spacing against your board design before substitution.

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

A: Substitution eligibility is determined by matching voltage rating, current hold and trip ratings, time-to-trip specification, initial and post-trip resistance values, operating temperature range, mounting type, package configuration, and physical dimensions. All these parameters must align for direct substitution.

Q: Do both parts have the same compliance certifications?

A: No. The RHEF650 carries CSA, TUV, and UL approvals. The MF-RHT650-0 carries AEC-Q200 qualification. Both are ROHS3 compliant. Select based on your application's specific certification requirements.

Q: What is the difference between packaging options?

A: The RHEF650 is supplied in bag packaging, while the MF-RHT650-0 is supplied in bulk packaging. This affects handling and inventory management but does not impact component functionality or electrical performance.