Equivalent & Substitute Parts for MF-RX110-2

Part Overview

The Bourns MF-RX110-2 is a polymeric PTC resettable fuse rated at 60V, 1.1A hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across voltage, current, thermal, and resistance parameters while accommodating minor mechanical variations inherent to different manufacturers' designs.

Key Parameters

Parameter	Value	Unit
Voltage - Max	60	V
Current - Hold (Ih) (Max)	1.1	A
Current - Trip (It)	2.2	A
Current - Max	40	A
Time to Trip	8.2	s
Resistance - Initial (Ri) (Min)	150	mOhms
Resistance - Post Trip (R1) (Max)	380	mOhms
Operating Temperature Range	-40 to 85	°C
Mounting Type	Through Hole	—
Package / Case	Radial, Disc	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the MF-RX110-2 is based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage rating must equal or exceed 60V maximum
Current hold (Ih) must equal 1.1A
Current trip (It) must equal 2.2A
Maximum current must equal 40A
Time to trip must equal 8.2s
Initial resistance (Ri) minimum must equal 150 mOhms
Post-trip resistance (R1) maximum must equal 380 mOhms
Operating temperature range must span -40°C to 85°C

Mechanical Compatibility Criteria:

Mounting type: Through Hole
Package configuration: Radial, Disc
Lead spacing tolerance: 0.197" to 0.201" (5.00mm to 5.10mm)

Compliance Criteria:

RoHS3 compliance required
Approval agencies: cURus, TUV minimum

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (same electrical and mechanical specifications from alternative manufacturers) and Parametric Equivalents (identical electrical performance with minor mechanical variations).

Parameter Comparison

Part Number	Manufacturer	Voltage (V)	Ih (A)	It (A)	Imax (A)	Ri Min (mΩ)	R1 Max (mΩ)	Time to Trip (s)	Status	Packaging
MF-RX110-2	Bourns Inc.	60	1.1	2.2	40	150	380	8.2	Obsolete	Bulk
PTR060V0110-TR1	Eaton - Electronics Division	60	1.1	2.2	40	150	380	8.2	Active	Tape & Reel
PTR060V0110-TR	Eaton - Electronics Division	60	1.1	2.2	40	150	380	8.2	Active	Tape & Reel
0ZRR0110FF2B	Bel Fuse Inc.	60	1.1	2.2	40	150	380	8.2	Active	Tape & Reel
RXEF110-2	Littelfuse	72	1.1	2.2	40	150	380	8.2	Active	Cut Tape
RXEF110K-2	Littelfuse	72	1.1	2.2	40	150	380	8.2	Active	Cut Tape
MF-RX110/72-2	Bourns Inc.	72	1.1	2.2	40	150	380	8.2	Active	Cut Tape

Engineering Selection Recommendations

Primary Substitutes (Exact 60V Electrical Match):

PTR060V0110-TR1 and PTR060V0110-TR from Eaton are direct electrical equivalents with active product status. Both maintain 60V maximum voltage rating, identical current and resistance parameters, and hold cURus and TUV approvals. These parts are available in Tape & Reel packaging, suitable for automated assembly environments. The PTR060V0110-TR1 variant is recommended as the primary choice due to confirmed active status and current inventory availability.

0ZRR0110FF2B from Bel Fuse Inc. provides an alternative 60V equivalent with identical electrical specifications and active status. This part includes AEC-Q200 automotive qualification and UL approval in addition to cURus and TUV certifications, offering enhanced compliance for automotive or mission-critical applications.

Secondary Substitutes (72V Voltage Upgrade):

RXEF110-2 and RXEF110K-2 from Littelfuse, along with MF-RX110/72-2 from Bourns, operate at 72V maximum voltage while maintaining all other electrical parameters identical to the MF-RX110-2. These parts are suitable for applications where the circuit voltage does not exceed 60V but higher voltage margin is beneficial. All three maintain active product status and ROHS3 compliance. The Littelfuse variants include expanded approval agencies (CQC, CSA, TUV, UL), while the Bourns variant maintains the same approval profile as the original part.

Packaging Considerations:

The original MF-RX110-2 is supplied in bulk packaging. Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) configurations, which are standard for high-volume manufacturing. Confirm packaging compatibility with assembly equipment before final selection.

Frequently Asked Questions (FAQ)

Q: Can I use a 72V rated substitute in a 60V circuit?

A: Yes. The 72V rated parts (RXEF110-2, RXEF110K-2, MF-RX110/72-2) are electrically compatible with 60V circuits. Higher voltage rating provides additional safety margin without affecting performance at lower voltages.

Q: What is the difference between PTR060V0110-TR and PTR060V0110-TR1?

A: Both are Eaton PTR060V series parts with identical electrical specifications and 60V rating. The TR1 designation indicates a specific manufacturing revision. Both are active and suitable for substitution. Verify with your supplier for any minor mechanical or packaging differences.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original MF-RX110-2 specification.

Q: Which substitute offers the broadest approval certifications?

A: The Littelfuse RXEF110-2 and RXEF110K-2 include CQC, CSA, TUV, and UL approvals. The Bel Fuse 0ZRR0110FF2B includes cURus, TUV, and UL approvals with AEC-Q200 automotive qualification. Select based on your specific regulatory or industry requirements.

Q: What are the lead spacing differences between substitutes?

A: Lead spacing ranges from 0.197" (5.00mm) for Eaton and Littelfuse parts to 0.201" (5.10mm) for Bourns and Bel Fuse parts. These variations are within standard through-hole PCB tolerance and do not affect interchangeability for radial disc packages.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet your circuit voltage and current requirements. Confirm mechanical fit on your PCB layout, as minor dimensional variations exist between manufacturers. For consistency in high-volume production, standardize on a single substitute part number.

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