MF-RX135-AP Equivalent & Substitute Parts

Part Overview

The MF-RX135-AP is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. as part of the Multifuse® MF-RX series. This component is rated for 60V maximum voltage with a 1.35A hold current and is designed for through-hole radial mounting in disc configuration. The product is currently listed as Obsolete, making identification of suitable substitute components essential for ongoing design support and procurement.

Substiute Parts

MF-RX135-AP

Bourns Inc.In Stock: 920MF-RX135-AP Datasheet

Current PartRFQ

MF-RX135/72-AP

Bourns Inc.In Stock: 1039MF-RX135/72-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-RX135-AP is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Polymeric PTC resettable fuse type
• Current - Hold (Ih) (Max): 1.35 A
• Current - Trip (It): 2.7 A
• Time to Trip: 9.6 s
• Resistance - Initial (Ri) (Min): 120 mOhms
• Resistance - Post Trip (R1) (Max): 300 mOhms
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Physical dimensions: 0.483" L x 0.122" W (12.26mm x 3.10mm)
• Height - Seated (Max): 0.718" (18.26mm)
• Lead Spacing: 0.201" (5.10mm)
• Approval Agency: cURus, TUV
• RoHS Status: ROHS3 Compliant

Allowable Variation:

• Voltage - Max: May exceed 60V (higher voltage rating is acceptable for lower-voltage applications)

The MF-RX135/72-AP meets all mandatory parameters while providing a higher voltage rating of 72V, making it a valid parametric equivalent for applications operating at or below 60V.

Parameter Comparison

Engineering Selection Recommendations

The MF-RX135/72-AP is a direct parametric equivalent to the MF-RX135-AP. Both components share identical electrical characteristics, thermal operating range, mechanical dimensions, and regulatory certifications. The primary distinction is product status: the MF-RX135-AP is Obsolete, while the MF-RX135/72-AP is Active.

The MF-RX135/72-AP carries a higher maximum voltage rating (72V versus 60V), which presents no functional limitation for applications designed for 60V operation. The elevated voltage rating provides additional design margin without affecting hold current, trip current, response time, or resistance characteristics.

Both components maintain ROHS3 compliance, cURus and TUV approvals, and unlimited moisture sensitivity classification (MSL 1). Mechanical compatibility is confirmed: identical radial disc package, lead spacing, and physical dimensions ensure direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the MF-RX135/72-AP replace the MF-RX135-AP in existing designs?

A: Yes. The MF-RX135/72-AP is a parametric equivalent with identical electrical performance, thermal range, and physical dimensions. The higher voltage rating does not affect operation in 60V applications.

Q: What is the difference between the two part numbers?

A: The primary difference is voltage rating: MF-RX135-AP is rated 60V, while MF-RX135/72-AP is rated 72V. All other electrical parameters, including hold current (1.35A), trip current (2.7A), and response time (9.6s), are identical. The MF-RX135-AP is Obsolete; the MF-RX135/72-AP is Active.

Q: Are the physical dimensions identical?

A: Yes. Both components use the same radial disc package with dimensions of 0.483" L x 0.122" W (12.26mm x 3.10mm), height of 0.718" (18.26mm), and lead spacing of 0.201" (5.10mm). Board-level substitution requires no layout modifications.

Q: Do both parts carry the same regulatory approvals?

A: Yes. Both the MF-RX135-AP and MF-RX135/72-AP are certified by cURus and TUV, maintain ROHS3 compliance, and are REACH Unaffected.

Q: What packaging is available for the MF-RX135/72-AP?

A: The MF-RX135/72-AP is supplied in Tape & Box (TB) packaging, suitable for automated assembly processes.