MF-R025-AP-99 Equivalent & Substitute Parts

Part Overview

The MF-R025-AP-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component provides overcurrent protection at 60V maximum voltage with a 250 mA hold current rating in a through-hole radial disc package. The part is currently listed as obsolete, making identification of functional equivalents and substitutes essential for ongoing system support and new design implementations.

Substiute Parts

MF-R025-AP-99

Bourns Inc.In Stock: 895MF-R025-AP-99 Datasheet

Current PartRFQ

MF-R025-AP

Bourns Inc.In Stock: 790MF-R025-AP Datasheet

Parametric EquivalentRFQ

MF-R025-AP-17

Bourns Inc.In Stock: 1202MF-R025-AP-17 Datasheet

Parametric EquivalentRFQ

MF-RX025/72-AP-17

Bourns Inc.In Stock: 857MF-RX025/72-AP-17 Datasheet

Parametric EquivalentRFQ

RXEF017-AP

LittelfuseIn Stock: 1385RXEF017-AP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-R025-AP-99 is determined by the following critical parameters:

Parametric Equivalents maintain identical electrical characteristics: 60V maximum voltage, 250 mA hold current, 500 mA trip current, 1 Ohm minimum initial resistance, and 3 Ohm maximum post-trip resistance. These parts are mechanically and electrically interchangeable within the same circuit design.

Similar Parts share the same voltage rating (60V) and mounting configuration (through-hole radial disc) but differ in hold current specifications. The RXEF017-AP from Littelfuse operates at 170 mA hold current with corresponding trip current of 340 mA, requiring circuit evaluation before substitution.

Substitution eligibility is restricted to parts meeting all of the following criteria:

• Voltage - Max: 60V or higher
• Current - Hold (Ih) (Max): 250 mA or higher
• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Lead Spacing: 0.199" to 0.201" (5.05mm to 5.10mm)

Parameter Comparison

Engineering Selection Recommendations

MF-R025-AP is a direct parametric equivalent with identical electrical specifications and mechanical dimensions. This part is active in production and maintains ROHS3 compliance. Selection of MF-R025-AP is appropriate for applications requiring the exact performance profile of the obsolete MF-R025-AP-99.

MF-R025-AP-17 is a parametric equivalent with identical electrical and mechanical characteristics to the main part. This variant includes expanded approval agency certifications (cUL, cURus, TUV, UL) and AEC-Q200 automotive qualification. Selection is suitable for applications requiring enhanced regulatory compliance or automotive-grade reliability.

MF-RX025/72-AP-17 maintains identical hold current (250 mA) and trip current (500 mA) specifications but operates at 72V maximum voltage. This higher voltage rating provides additional design margin in systems operating below 60V. The part includes AEC-Q200 qualification and expanded certifications. Selection is appropriate when higher voltage headroom is beneficial or required.

RXEF017-AP from Littelfuse differs in hold current (170 mA versus 250 mA) and trip current (340 mA versus 500 mA). Initial and post-trip resistance values also differ. This part is suitable only for applications where the lower current thresholds are acceptable and circuit performance has been evaluated against the modified protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can MF-R025-AP directly replace MF-R025-AP-99 in existing designs?

A: Yes. MF-R025-AP is a parametric equivalent with identical voltage, current, resistance, and mechanical specifications. The parts are electrically and mechanically interchangeable. MF-R025-AP is currently in active production, making it the primary replacement for the obsolete MF-R025-AP-99.

Q: What is the difference between MF-R025-AP and MF-R025-AP-17?

A: Both parts are parametric equivalents with identical electrical characteristics. MF-R025-AP-17 includes additional approval agency certifications (cUL and UL in addition to cURus and TUV) and AEC-Q200 automotive qualification. Selection depends on regulatory or qualification requirements for the application.

Q: Can MF-RX025/72-AP-17 be used instead of MF-R025-AP-99?

A: Yes, with consideration for the higher voltage rating. MF-RX025/72-AP-17 maintains identical hold current (250 mA) and trip current (500 mA) specifications but operates at 72V maximum voltage. This part is suitable for applications operating at 60V or below and provides additional voltage margin. The higher voltage rating does not degrade performance in lower-voltage circuits.

Q: Is RXEF017-AP a suitable replacement?

A: RXEF017-AP differs in critical electrical parameters. Hold current is 170 mA (versus 250 mA) and trip current is 340 mA (versus 500 mA). Initial resistance is 3.3 Ohms (versus 1 Ohm) and post-trip resistance is 8 Ohms (versus 3 Ohms). This part is suitable only when circuit analysis confirms that the lower current thresholds and higher resistance values are acceptable for the application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the original MF-R025-AP-99.

Q: What are the lead spacing tolerances for mechanical compatibility?

A: The MF-R025-AP-99 specifies 0.201" (5.10mm) lead spacing. RXEF017-AP specifies 0.199" (5.05mm). This 0.002" (0.05mm) difference is within typical PCB pad tolerance and does not prevent mechanical compatibility. All other substitute parts maintain 0.201" (5.10mm) spacing.

Q: Which substitute part has the broadest regulatory approvals?

A: MF-R025-AP-17 and MF-RX025/72-AP-17 both include cUL, cURus, TUV, and UL approvals. RXEF017-AP includes CQC, CSA, TUV, and UL approvals. Selection depends on specific regulatory requirements for the target market or application.