Equivalent & Substitute Parts for MF-RX185-AP

Part Overview

The MF-RX185-AP is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-RX series. This component is rated for 60V maximum voltage with a 1.85A hold current and is designed for through-hole radial mounting in disc configuration. The product is currently obsolete, making identification of equivalent and substitute parts essential for ongoing system support and component procurement.

Substiute Parts

MF-RX185-AP

Bourns Inc.In Stock: 1227MF-RX185-AP Datasheet

Current PartRFQ

MF-RX185/72-AP

Bourns Inc.In Stock: 1054MF-RX185/72-AP Datasheet

Parametric EquivalentRFQ

60R185XF

LittelfuseIn Stock: 448160R185XF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-RX185-AP are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Current - Hold (Ih): 1.85 A
• Current - Trip (It): 3.7 A
• Resistance - Initial (Ri): 80 mOhms minimum
• Resistance - Post Trip (R1): 190 mOhms maximum
• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Lead Spacing: 0.201" (5.10mm)
• Operating Temperature Range: -40°C ~ 85°C
• Type: Polymeric

Voltage Consideration: Substitutes may operate at equal or higher maximum voltage ratings while maintaining all other electrical and mechanical parameters. A higher voltage rating does not compromise functionality in circuits designed for lower voltages.

Parameter Comparison

Engineering Selection Recommendations

MF-RX185/72-AP (Parametric Equivalent - Bourns Inc.): This part maintains identical electrical characteristics and mechanical form factor to the MF-RX185-AP while offering a higher maximum voltage rating of 72V. The component is in active production status, ensuring long-term availability. It carries the same regulatory certifications (cURus, TUV) and RoHS3 compliance. Packaging is available in Tape & Box format. This represents the direct parametric equivalent for the obsolete MF-RX185-AP.

60R185XF (Similar - Littelfuse): This part matches all critical electrical parameters and mechanical specifications of the MF-RX185-AP, including the 60V maximum voltage rating. The component is in active production status with higher inventory availability (4463 units in stock). It carries identical regulatory certifications and RoHS3 compliance. Packaging is available in bulk format. The primary difference is manufacturer origin (Littelfuse POLY-FUSE® series versus Bourns Multifuse® series) and minor dimensional variations in the radial disc configuration.

Frequently Asked Questions (FAQ)

Q: Can MF-RX185/72-AP be used as a direct replacement for MF-RX185-AP? A: Yes. The MF-RX185/72-AP is a parametric equivalent with identical hold current (1.85A), trip current (3.7A), resistance characteristics, and mechanical form factor. The higher voltage rating (72V versus 60V) does not affect functionality in 60V circuits.

Q: What is the difference between MF-RX185/72-AP and 60R185XF? A: Both parts match the electrical specifications of the MF-RX185-AP. The MF-RX185/72-AP is manufactured by Bourns with a 72V rating, while 60R185XF is manufactured by Littelfuse with a 60V rating matching the original. Both are in active production and carry equivalent certifications.

Q: Are there packaging differences between these substitutes? A: Yes. MF-RX185/72-AP is available in Tape & Box packaging, while 60R185XF is available in bulk packaging. The original MF-RX185-AP packaging format is not specified in available data.

Q: Do all three parts have the same lead spacing and mounting footprint? A: Yes. All three parts feature 0.201" (5.10mm) lead spacing and through-hole radial disc mounting, ensuring identical PCB footprint compatibility.

Q: Are regulatory certifications equivalent across all three parts? A: Yes. All three parts carry cURus and TUV approvals and are ROHS3 compliant, meeting the same regulatory requirements.