Equivalent & Substitute Parts for MF-RX110-2-99

Part Overview

The Bourns MF-RX110-2-99 is a polymeric PTC resettable fuse rated at 60V, 1.1A hold current, designed for through-hole radial mounting in disc configuration. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The MF-RX series from Bourns provides automatic overcurrent protection with automatic recovery after fault condition removal.

Key Parameters

Parameter	Value
Voltage Rating (Max)	60V
Current - Hold (Ih)	1.1 A
Current - Trip (It)	2.2 A
Current - Max	40 A
Time to Trip	8.2 s
Resistance - Initial (Ri)	150 mOhms (Min)
Resistance - Post Trip (R1)	380 mOhms (Max)
Operating Temperature Range	-40°C to 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.201" (5.10mm)
Approval Agencies	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MF-RX110-2-99 is determined by the following critical parameters:

Voltage Rating: Substitute parts must be rated at 60V or higher to maintain circuit protection integrity
Current - Hold (Ih): Must match 1.1A to ensure proper circuit operation without nuisance trips
Current - Trip (It): Must match 2.2A for consistent fault detection
Resistance Characteristics: Initial resistance (Ri) and post-trip resistance (R1) must remain within specified ranges
Operating Temperature: Must support -40°C to 85°C range
Mounting Configuration: Through-hole radial disc mounting is required for PCB compatibility
Lead Spacing: 0.201" (5.10mm) nominal spacing for footprint compatibility

Substitutes are classified into two categories:

Direct Manufacturer Substitutes: Parts from Bourns and Eaton that maintain identical electrical specifications and form factor.

Parametric Equivalents: Parts from alternative manufacturers (Littelfuse, Bel Fuse) that meet all critical electrical parameters and mounting requirements, though minor dimensional variations may exist within acceptable tolerances.

Parameter Comparison

Part Number	Manufacturer	Voltage (Max)	Ih (Max)	It	Ri (Min)	R1 (Max)	Temp Range	Status	Packaging
MF-RX110-2-99	Bourns Inc.	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Obsolete	Bulk
MF-RX110/72-0	Bourns Inc.	72V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Active	Bulk
PTR060V0110-TR	Eaton - Electronics Division	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Active	Tape & Reel (TR)
PTR060V0110-TR1	Eaton - Electronics Division	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Active	Tape & Reel (TR)
RXEF110-2	Littelfuse	72V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Active	Cut Tape (CT)
RXEF110K-2	Littelfuse	72V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Active	Cut Tape (CT)
0ZRR0110FF2B	Bel Fuse Inc.	60V	1.1 A	2.2 A	150 mOhms	380 mOhms	-40°C ~ 85°C	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

PTR060V0110-TR and PTR060V0110-TR1 from Eaton are the preferred substitutes. Both maintain the exact 60V voltage rating and all electrical specifications of the original MF-RX110-2-99. Both parts are active in production status with established supply chains. Eaton parts carry cURus and TUV certifications matching the original part's approval agencies.

0ZRR0110FF2B from Bel Fuse Inc. provides an alternative with identical 60V rating and electrical parameters. This part includes AEC-Q200 automotive qualification and carries cURus, TUV, and UL certifications, offering enhanced compliance for applications requiring automotive-grade components.

Secondary Substitutes (Higher Voltage Rating)

MF-RX110/72-0 from Bourns and RXEF110-2 and RXEF110K-2 from Littelfuse operate at 72V, providing higher voltage margin than the original 60V specification. These parts are suitable for applications where circuit voltage does not exceed 60V, as the higher rating provides additional safety margin. All three parts are active in production. Littelfuse parts carry expanded certifications including CQC, CSA, TUV, and UL.

Packaging Considerations

The original MF-RX110-2-99 is supplied in bulk packaging. Eaton and Bel Fuse alternatives are supplied in Tape & Reel format, suitable for automated assembly. Littelfuse alternatives are supplied in Cut Tape format. Packaging selection depends on production volume and assembly equipment compatibility.

Frequently Asked Questions (FAQ)

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

A: Yes. The 72V-rated parts (MF-RX110/72-0, RXEF110-2, RXEF110K-2) are fully compatible with 60V circuits. The higher voltage rating provides additional safety margin and does not affect circuit operation at lower voltages.

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

A: Both parts are electrically and mechanically identical. The TR1 designation indicates a later production revision. Both are active Eaton products with identical specifications and certifications.

Q: Are there dimensional differences between substitute parts?

A: Minor dimensional variations exist within acceptable tolerances. The MF-RX110-2-99 measures 0.512" diameter × 0.122" thickness with 0.201" lead spacing. Eaton PTR parts measure 0.512" diameter × 0.118" thickness with 0.197" lead spacing. Littelfuse RXEF parts measure 0.504" diameter × 0.118" thickness with 0.199" lead spacing. All variations remain within standard PCB footprint tolerances for radial disc components.

Q: Which substitute offers the best compliance certifications?

A: RXEF110-2 and RXEF110K-2 from Littelfuse carry the broadest certification set: CQC, CSA, TUV, and UL. The 0ZRR0110FF2B from Bel Fuse includes AEC-Q200 automotive qualification. Selection depends on specific application compliance requirements.

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

A: Yes. All listed substitutes meet identical electrical specifications and are mechanically compatible. Mixed sourcing is acceptable from an engineering standpoint, though procurement and quality control processes may prefer single-source standardization.

Q: What is the inventory status for substitutes?

A: PTR060V0110-TR1 (833 pcs), 0ZRR0110FF2B (905 pcs), PTR060V0110-TR (919 pcs), RXEF110-2 (2280 pcs), MF-RX110/72-0 (3200 pcs), and RXEF110K-2 (2677 pcs) are all in active stock as new original parts.

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