MF-R005-AP-99 Equivalent & Substitute Parts

Part Overview

The MF-R005-AP-99 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component is rated for 60V maximum voltage with a 50 mA hold current and 100 mA trip current, designed for through-hole radial mounting in disc configuration. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Substiute Parts

MF-R005-AP-99

Bourns Inc.In Stock: 928MF-R005-AP-99 Datasheet

Current PartRFQ

MF-R005-AP

Bourns Inc.In Stock: 4950MF-R005-AP Datasheet

Parametric EquivalentRFQ

RXEF005-2

Littelfuse Inc.In Stock: 17833RXEF005-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MF-R005-AP-99 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 60V maximum
• Hold current (Ih): 50 mA maximum
• Trip current (It): 100 mA
• Time to trip: 5 seconds
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through-hole radial disc
• Physical dimensions: 0.315" diameter with compatible lead spacing
• Regulatory compliance: RoHS3 compliance and international approvals

Two substitute parts meet these criteria: MF-R005-AP from Bourns Inc. (parametric equivalent with different packaging) and RXEF005-2 from Littelfuse Inc. (similar part from alternative manufacturer with minor dimensional variance).

Parameter Comparison

Engineering Selection Recommendations

MF-R005-AP is the primary substitute for MF-R005-AP-99. Both parts are manufactured by Bourns Inc., share identical electrical and thermal specifications, and maintain the same physical footprint. The MF-R005-AP is currently in active production status, ensuring long-term availability and supply chain stability. The only difference is packaging format (Cut Tape versus unspecified original packaging).

RXEF005-2 from Littelfuse Inc. is a functionally equivalent alternative. All critical electrical parameters match the original specification. Physical dimensions are nearly identical with only 0.004" (0.10mm) thickness variance and 0.002" (0.05mm) lead spacing variance, which are within typical PCB tolerance ranges for through-hole radial components. The RXEF005-2 carries broader regulatory approvals (CQC, CSA, TUV, UL) compared to the original part. Post-trip resistance is 20 Ohms maximum versus 22 Ohms, representing a 9% reduction in maximum resistance that remains within acceptable operating margins for this component class.

Frequently Asked Questions (FAQ)

Q: Can MF-R005-AP directly replace MF-R005-AP-99 in existing designs?

A: Yes. MF-R005-AP is a parametric equivalent with identical electrical specifications, operating temperature range, and physical dimensions. The parts are functionally interchangeable for all circuit applications.

Q: What are the dimensional differences between RXEF005-2 and the original part?

A: RXEF005-2 has a thickness of 0.118" (3.00mm) compared to 0.122" (3.10mm) for MF-R005-AP-99, and lead spacing of 0.199" (5.05mm) versus 0.201" (5.10mm). These differences are minor and compatible with standard through-hole PCB designs.

Q: Does RXEF005-2 have different electrical behavior than MF-R005-AP-99?

A: All critical electrical parameters are identical. The post-trip resistance maximum is 20 Ohms for RXEF005-2 versus 22 Ohms for MF-R005-AP-99. This represents a tighter specification and does not affect circuit functionality.

Q: Which substitute should be selected for new production?

A: MF-R005-AP is recommended as the primary choice due to identical specifications and same-manufacturer sourcing. RXEF005-2 is a valid alternative if supply constraints exist, with the advantage of broader regulatory certifications.

Q: Are there packaging considerations when selecting a substitute?

A: MF-R005-AP and RXEF005-2 are supplied in Cut Tape (CT) packaging. Confirm packaging requirements for your assembly process, as this may differ from the original MF-R005-AP-99 packaging format.