MF-R005-2-99 Equivalent & Substitute Parts

Part Overview

The MF-R005-2-99 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component provides overcurrent protection with a 60V maximum voltage rating and 50 mA hold current in a through-hole radial disc package. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	50 mA
Current - Trip (It)	100 mA
Current - Max	40 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	7.3 Ohms
Resistance - Post Trip (R1) (Max)	22 Ohms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.315" Dia x 0.122" T (8.00mm x 3.10mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MF-R005-2-99 is determined by strict equivalence across the following critical parameters:

Voltage - Max: 60V
Current - Hold (Ih) (Max): 50 mA
Current - Trip (It): 100 mA
Resistance - Initial (Ri) (Min): 7.3 Ohms
Resistance - Post Trip (R1) (Max): 22 Ohms (or lower)
Operating Temperature: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: Radial, Disc
Physical dimensions and lead spacing within tolerance

Substitute parts are classified into two categories:

Parametric Equivalents (Bourns Inc.): Parts MF-R005-2, MF-R005-2-14, and MF-R005-AP maintain identical electrical specifications and physical form factor. These differ only in packaging format (Cut Tape, Tape & Reel) and product status (Active vs. Obsolete).

Similar Equivalent (Cross-Manufacturer): Part RXEF005-2 from Littelfuse Inc. meets all critical electrical parameters and physical dimensions. Minor variations in post-trip resistance (20 Ohms vs. 22 Ohms maximum) and dimensional tolerances (0.118" vs. 0.122" thickness, 0.199" vs. 0.201" lead spacing) remain within acceptable substitution criteria.

Parameter Comparison

Parameter	MF-R005-2-99	MF-R005-2	MF-R005-2-14	MF-R005-AP	RXEF005-2
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.	Littelfuse Inc.
Series	Multifuse® MF-R	Multifuse® MF-R	Multifuse® MF-R	Multifuse® MF-R	PolySwitch® RXEF
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Max	60V	60V	60V	60V	60V
Current - Hold (Ih) (Max)	50 mA	50 mA	50 mA	50 mA	50 mA
Current - Trip (It)	100 mA	100 mA	100 mA	100 mA	100 mA
Current - Max	40 A	40 A	40 A	40 A	40 A
Time to Trip	5 s	5 s	5 s	5 s	5 s
Resistance - Initial (Ri) (Min)	7.3 Ohms	7.3 Ohms	7.3 Ohms	7.3 Ohms	7.3 Ohms
Resistance - Post Trip (R1) (Max)	22 Ohms	22 Ohms	22 Ohms	22 Ohms	20 Ohms
Operating Temperature	-40°C ~ 85°C	-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	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.315" Dia x 0.122" T (8.00mm x 3.10mm)	0.315" Dia x 0.122" T (8.00mm x 3.10mm)	0.315" Dia x 0.122" T (8.00mm x 3.10mm)	0.315" Dia x 0.122" T (8.00mm x 3.10mm)	0.315" Dia x 0.118" T (8.00mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.199" (5.05mm)
Approval Agency	cURus, TUV	cURus, TUV	cUL, cURus, TUV, UL	cURus, TUV	CQC, CSA, TUV, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	-	Cut Tape (CT)	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)

Engineering Selection Recommendations

For applications currently using MF-R005-2-99, the following selection criteria apply:

Primary Substitutes (Bourns Inc. Multifuse® MF-R Series):

MF-R005-2 and MF-R005-AP are direct parametric equivalents with active product status. Both maintain identical electrical and physical specifications. Selection between these two depends on packaging requirements: MF-R005-2 is available in Cut Tape format with 16,884 units in stock, while MF-R005-AP is also available in Cut Tape with 4,899 units in stock.

MF-R005-2-14 is a parametric equivalent available in Tape & Reel format with active product status and expanded approval certifications (cUL, cURus, TUV, UL) including AEC-Q200 automotive qualification. This variant is suitable for applications requiring automotive-grade reliability.

Cross-Manufacturer Substitute (Littelfuse Inc. PolySwitch® RXEF Series):

RXEF005-2 provides functional equivalence with all critical electrical parameters matched. The post-trip resistance specification is 20 Ohms (versus 22 Ohms maximum for Bourns parts), representing improved performance. Physical dimensions show minor variations within acceptable tolerance: thickness of 0.118" (versus 0.122") and lead spacing of 0.199" (versus 0.201"). These dimensional differences do not affect PCB footprint compatibility for standard through-hole radial disc layouts. RXEF005-2 carries expanded regulatory approvals (CQC, CSA, TUV, UL) and has 17,815 units in stock.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MF-R005-2 directly replace MF-R005-2-99 in production?

A: Yes. MF-R005-2 is a parametric equivalent with identical electrical specifications (60V, 50 mA hold current, 100 mA trip current, 7.3 Ohms initial resistance, 22 Ohms post-trip resistance) and physical form factor. The primary difference is packaging format (Cut Tape versus the original packaging) and active product status. No circuit redesign is required.

Q: What is the difference between MF-R005-2, MF-R005-2-14, and MF-R005-AP?

A: All three are parametric equivalents with identical electrical and physical specifications. MF-R005-2 and MF-R005-AP are available in Cut Tape packaging. MF-R005-2-14 is available in Tape & Reel packaging and includes AEC-Q200 automotive qualification with expanded certifications (cUL, cURus, TUV, UL). Selection depends on packaging format requirements and whether automotive-grade qualification is needed.

Q: Can RXEF005-2 from Littelfuse replace the Bourns MF-R005-2-99?

A: Yes. RXEF005-2 meets all critical electrical parameters and operates within the same voltage, current, and temperature ranges. The post-trip resistance is 20 Ohms (lower than the 22 Ohms maximum of Bourns parts), which represents equivalent or improved performance. Physical dimensions show minor variations (0.118" thickness versus 0.122", 0.199" lead spacing versus 0.201") that remain within acceptable tolerance for standard through-hole radial disc PCB layouts. Cross-manufacturer substitution is functionally valid.

Q: Are there any compliance or certification differences between these parts?

A: MF-R005-2-14 carries the broadest certification set (cUL, cURus, TUV, UL) including AEC-Q200 automotive qualification. MF-R005-2 and MF-R005-AP carry cURus and TUV certifications. RXEF005-2 carries CQC, CSA, TUV, and UL certifications. All parts are ROHS3 compliant. Selection should consider specific application certification requirements.

Q: What is the inventory status for these substitute parts?

A: MF-R005-2 has 16,884 units in stock (Cut Tape). MF-R005-2-14 has 831 units in stock (Tape & Reel). MF-R005-AP has 4,899 units in stock (Cut Tape). RXEF005-2 has 17,815 units in stock (Cut Tape). All parts are listed as new original stock.

Q: Do these parts have identical physical dimensions?

A: Bourns parts (MF-R005-2, MF-R005-2-14, MF-R005-AP) have identical dimensions: 0.315" diameter x 0.122" thickness with 0.201" lead spacing. RXEF005-2 has minor dimensional variations: 0.315" diameter x 0.118" thickness with 0.199" lead spacing. These variations are within acceptable tolerance for standard through-hole radial disc footprints and do not require PCB redesign.

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