Bourns MF-RX135-0-H2 Polymeric PTC Resettable Fuse: Equivalent & Substitute Parts

Part Overview

The Bourns MF-RX135-0-H2 is an active polymeric PTC resettable fuse rated for 60V maximum voltage with a 1.35A hold current. This through-hole radial disc component is designed for circuit protection applications requiring automatic reset capability after fault conditions. The part is ROHS3 compliant and carries cURus and TUV approvals. Substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the Multifuse MF-RX series.

Substiute Parts

MF-RX135-0-H2

Bourns Inc.In Stock: 1038MF-RX135-0-H2 Datasheet

Current PartRFQ

MF-RX135/72-2

Bourns Inc.In Stock: 70269MF-RX135/72-2 Datasheet

DirectRFQ

MF-RX135/72-0

Bourns Inc.In Stock: 21990MF-RX135/72-0 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MF-RX135-0-H2 are identified within the Bourns Multifuse MF-RX series based on the following allowed substitution criteria:

Matching Parameters (Required for Substitution):

• Current - Hold (Ih) (Max): 1.35 A
• Current - Trip (It): 2.7 A
• Current - Max: 40 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
• Size / Dimension: 0.483" L x 0.122" W (12.26mm x 3.10mm)
• Lead Spacing: 0.201" (5.10mm)
• Approval Agency: cURus, TUV
• RoHS Status: ROHS3 Compliant

Allowable Variation:

• Voltage - Max: Substitutes rated at 72V are acceptable for applications designed for 60V operation, as higher voltage rating provides additional safety margin.
• Packaging: Substitutes available in Cut Tape (CT) or Bulk packaging formats are functionally equivalent to the original radial disc configuration.

Parameter Comparison

Engineering Selection Recommendations

Both MF-RX135/72-2 and MF-RX135/72-0 are active products with identical electrical and mechanical specifications to the MF-RX135-0-H2, differing only in packaging format and voltage rating. All three parts carry cURus and TUV approvals and maintain ROHS3 compliance.

The MF-RX135/72-2 (Cut Tape packaging) is suitable for automated assembly processes. The MF-RX135/72-0 (Bulk packaging) is appropriate for manual assembly or high-volume procurement scenarios. The 72V rating of both substitutes provides compatibility with the 60V design specification while offering additional voltage margin.

Selection between substitute parts should be based on procurement requirements, assembly methodology, and inventory availability rather than electrical performance, as all three parts deliver identical circuit protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can MF-RX135/72-2 or MF-RX135/72-0 be used as direct replacements for MF-RX135-0-H2?

A: Yes. Both substitute parts match all critical electrical parameters including hold current (1.35A), trip current (2.7A), trip time (9.6s), and resistance characteristics. The 72V voltage rating is compatible with 60V circuit designs. Mechanical dimensions and lead spacing are identical, ensuring PCB compatibility.

Q: What is the difference between the substitute parts?

A: MF-RX135/72-2 is supplied in Cut Tape (CT) packaging for automated pick-and-place assembly. MF-RX135/72-0 is supplied in Bulk packaging for manual assembly or high-volume applications. Electrical and mechanical specifications are identical.

Q: Why do the substitute parts have a higher voltage rating (72V vs 60V)?

A: The 72V rating represents the maximum voltage the component can withstand. A higher rating does not affect performance in 60V applications; it simply provides additional safety margin and is acceptable for direct substitution.

Q: Are all three parts ROHS3 compliant?

A: Yes. MF-RX135-0-H2, MF-RX135/72-2, and MF-RX135/72-0 are all ROHS3 compliant with cURus and TUV approvals.

Q: Which substitute should I select for my application?

A: Selection depends on your assembly process and procurement method. Use MF-RX135/72-2 for automated assembly lines requiring tape packaging. Use MF-RX135/72-0 for manual assembly or bulk procurement. Both deliver identical electrical protection performance.