MF-R135-AP-99 Equivalent & Substitute Parts

Part Overview

The MF-R135-AP-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component provides overcurrent protection with a 30V maximum voltage rating and 1.35A hold current specification. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and component procurement.

Substiute Parts

MF-R135-AP-99

Bourns Inc.In Stock: 807MF-R135-AP-99 Datasheet

Current PartRFQ

MF-R135-AP

Bourns Inc.In Stock: 996MF-R135-AP Datasheet

Parametric EquivalentRFQ

MF-R135-AP-17

Bourns Inc.In Stock: 749MF-R135-AP-17 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-R135-AP-99 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 30V maximum
• Hold current (Ih): 1.35A maximum
• Trip current (It): 2.7A
• Time to trip: 7.3 seconds
• Initial resistance (Ri): 65 mOhms minimum
• Post-trip resistance (R1): 170 mOhms maximum
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through hole radial disc package
• Physical dimensions: 0.350" diameter x 0.118" thickness with 0.201" lead spacing

All identified substitute parts maintain identical electrical characteristics and mechanical form factors, ensuring direct functional replacement without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

Both MF-R135-AP and MF-R135-AP-17 are direct functional equivalents to the obsolete MF-R135-AP-99, with all critical electrical and mechanical parameters identical. Selection between these two active alternatives should be based on the following factors:

MF-R135-AP is the standard active production variant with cURus and TUV certifications, suitable for general applications requiring the specified 30V/1.35A protection characteristics.

MF-R135-AP-17 includes expanded regulatory approvals (cUL, cURus, TUV, UL) and AEC-Q200 automotive qualification, making it the appropriate choice for applications requiring automotive-grade reliability or broader certification coverage.

Both parts are available in Tape & Box packaging and maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MF-R135-AP or MF-R135-AP-17 be used as direct replacements for MF-R135-AP-99?

A: Yes. Both substitute parts maintain identical electrical specifications (30V, 1.35A hold current, 2.7A trip current, 7.3s trip time) and mechanical form factors (through-hole radial disc, 0.350" diameter, 0.201" lead spacing). No circuit modifications are required.

Q: What is the difference between MF-R135-AP and MF-R135-AP-17?

A: The primary differences are regulatory certifications and automotive qualification. MF-R135-AP-17 includes AEC-Q200 automotive qualification and expanded agency approvals (cUL, UL in addition to cURus and TUV). MF-R135-AP carries cURus and TUV certifications. Both have identical electrical and mechanical specifications.

Q: Why is MF-R135-AP-99 listed as obsolete?

A: The MF-R135-AP-99 has been superseded by active production variants. MF-R135-AP and MF-R135-AP-17 are the current alternatives with identical performance characteristics and improved availability.

Q: Are there packaging differences between these parts?

A: MF-R135-AP-99 packaging is not specified. Both MF-R135-AP and MF-R135-AP-17 are supplied in Tape & Box (TB) packaging, which is standard for production components.

Q: Which substitute should I select for new designs?

A: For applications requiring automotive-grade reliability or broader regulatory coverage, select MF-R135-AP-17. For general industrial applications, MF-R135-AP is appropriate. Both are active production parts with equivalent electrical performance.