MF-R075-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-R075-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This through-hole radial disc component provides overcurrent protection at 60V with a 750 mA hold current rating. The part is active in production with ROHS3 compliance and cURus/TUV approval. Substitute parts may be required due to inventory availability, packaging format differences, or specific application lead spacing and dimensional constraints.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
Current - Max	40 A
Time to Trip	6.3 s
Resistance - Initial (Ri) (Min)	180 mOhms
Resistance - Post Trip (R1) (Max)	600 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.409" Dia x 0.122" T (10.40mm x 3.10mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitution eligibility for the MF-R075-2 is determined by the following critical parameters:

Parametric Equivalents maintain identical electrical specifications: 60V maximum voltage, 750 mA hold current, 1.5 A trip current, 6.3 s time to trip, and 600 mOhms maximum post-trip resistance. These parts are functionally interchangeable in circuit design.

Similar Parts share the same voltage rating (60V), hold current (750 mA), trip current (1.5 A), and maximum current (40 A), but may differ in initial resistance, physical dimensions, or time-to-trip characteristics. These parts require circuit validation before substitution.

Non-Equivalent Parts such as RXEF017-AP differ significantly in hold current (170 mA vs. 750 mA) and initial resistance (3.3 Ohms vs. 180 mOhms), making them unsuitable as direct substitutes despite sharing the same voltage rating and package type.

Parameter Comparison

Parameter	MF-R075-2 (Bourns)	MF-R075-AP (Bourns)	60R075XU (Littelfuse)	RXEF017-AP (Littelfuse)
Manufacturer	Bourns Inc.	Bourns Inc.	Littelfuse Inc.	Littelfuse
Series	Multifuse® MF-R	Multifuse® MF-R	POLY-FUSE® 60R	PolySwitch® RXEF
Voltage - Max	60V	60V	60V	60V
Current - Hold (Ih) (Max)	750 mA	750 mA	750 mA	170 mA
Current - Trip (It)	1.5 A	1.5 A	1.5 A	340 mA
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	6.3 s	6.3 s	6.3 s	3 s
Resistance - Initial (Ri) (Min)	180 mOhms	180 mOhms	250 mOhms	3.3 Ohms
Resistance - Post Trip (R1) (Max)	600 mOhms	600 mOhms	600 mOhms	8 Ohms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.409" Dia x 0.122" T (10.40mm x 3.10mm)	0.409" Dia x 0.122" T (10.40mm x 3.10mm)	0.402" Dia x 10.20mm x 3.10mm	0.291" Dia x 0.118" T (7.40mm x 3.00mm)
Height - Seated (Max)	0.630" (16.00mm)	0.630" (16.00mm)	0.591" (15.00mm)	0.500" (12.70mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.199" (5.05mm)
Packaging	Cut Tape (CT)	Cut Tape (CT)	Bulk	Cut Tape (CT)
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV	CQC, CSA, TUV, UL

Engineering Selection Recommendations

MF-R075-AP (Bourns Inc.) is a parametric equivalent to MF-R075-2. Both parts share identical electrical specifications, dimensional characteristics, and regulatory approvals. This part is suitable for direct substitution with no circuit modifications required. Higher inventory availability (12,880 pcs) may support supply chain continuity.

60R075XU (Littelfuse Inc.) maintains electrical equivalence in voltage, hold current, trip current, and maximum current ratings. Initial resistance differs at 250 mOhms minimum versus 180 mOhms, and seated height is 0.591" versus 0.630". Physical dimensions are marginally smaller. This part is suitable for substitution in applications where the dimensional variance and resistance tolerance do not impact circuit performance. Bulk packaging format differs from cut tape.

RXEF017-AP (Littelfuse) is not suitable as a direct substitute. Hold current is 170 mA (versus 750 mA), trip current is 340 mA (versus 1.5 A), and initial resistance is 3.3 Ohms (versus 180 mOhms). These parameters define a fundamentally different protection profile. This part is listed in the original substitute field but represents a different application class.

All active parts maintain ROHS3 compliance and operate across the -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can MF-R075-AP be used as a direct replacement for MF-R075-2?

A: Yes. MF-R075-AP is a parametric equivalent with identical voltage, current, resistance, and time-to-trip specifications. Both parts are manufactured by Bourns Inc. in the Multifuse® MF-R series with matching dimensions and lead spacing. No circuit modifications are required.

Q: Is 60R075XU compatible with MF-R075-2?

A: 60R075XU shares the same voltage (60V), hold current (750 mA), trip current (1.5 A), and lead spacing (5.10mm). Initial resistance is 250 mOhms minimum versus 180 mOhms, and seated height is 0.591" versus 0.630". The part is suitable for substitution if circuit design tolerates the resistance and height variance. Bulk packaging differs from cut tape format.

Q: Why is RXEF017-AP listed as a substitute if it has different current ratings?

A: RXEF017-AP is listed in the original part's substitute field but is not electrically equivalent. Hold current is 170 mA versus 750 mA, and initial resistance is 3.3 Ohms versus 180 mOhms. This part represents a different protection class and is not suitable for direct substitution in circuits designed for 750 mA hold current protection.

Q: What are the critical parameters for substitution?

A: Voltage rating (60V), hold current (750 mA), trip current (1.5 A), and post-trip resistance (600 mOhms maximum) define functional equivalence. Physical dimensions and lead spacing must accommodate PCB layout constraints. Packaging format (cut tape vs. bulk) affects procurement and assembly processes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MF-R075-2, MF-R075-AP, 60R075XU, and RXEF017-AP are all ROHS3 compliant. All parts operate across -40°C to 85°C and carry regulatory approvals from cURus, TUV, or equivalent agencies.

Q: What is the difference between cut tape and bulk packaging?

A: Cut tape (CT) packaging provides individual component strips suitable for automated pick-and-place assembly. Bulk packaging requires manual handling and sorting. MF-R075-2 and MF-R075-AP are supplied in cut tape format. 60R075XU is supplied in bulk format. Packaging selection depends on assembly process requirements.

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