MF-R030-2-99 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-R030-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component is rated for 60V maximum voltage with a 300 mA hold current and 600 mA trip current, designed for through-hole radial mounting in a disc package configuration. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Bourns Inc.
Series	Multifuse® MF-R
Voltage - Max	60V
Current - Hold (Ih)	300 mA
Current - Trip (It)	600 mA
Resistance - Initial (Ri)	760 mOhms (Min)
Resistance - Post Trip (R1)	2.1 Ohms (Max)
Operating Temperature Range	-40°C to 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.291" Dia x 0.122" T (7.40mm x 3.10mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant
Approval Agencies	cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the MF-R030-2-99 are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 60V maximum voltage, 300 mA hold current, 600 mA trip current, 760 mOhms initial resistance, and 2.1 Ohms maximum post-trip resistance. These parts share the same physical dimensions, lead spacing, and through-hole radial disc package configuration. Parametric equivalents differ only in packaging format (Cut Tape vs. Tape & Reel) or product status (Active vs. Obsolete).

Similar Parts share the same voltage rating and package type but differ in hold current specification. These parts are suitable only when the application can tolerate the specified current deviation.

Key Parameters Determining Substitution:

Voltage - Max: 60V (primary constraint)
Current - Hold (Ih): 300 mA (primary constraint for parametric equivalents)
Current - Trip (It): 600 mA (primary constraint for parametric equivalents)
Resistance - Initial (Ri): 760 mOhms (primary constraint for parametric equivalents)
Resistance - Post Trip (R1): 2.1 Ohms (primary constraint for parametric equivalents)
Package / Case: Radial, Disc (mechanical constraint)
Mounting Type: Through Hole (mechanical constraint)
Lead Spacing: 0.201" (5.10mm) (mechanical constraint)

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Ri (Min)	R1 (Max)	Package	Packaging Format	Product Status
MF-R030-2-99	Bourns Inc.	60V	300 mA	600 mA	760 mOhms	2.1 Ohms	Radial, Disc	-	Obsolete
MF-R030-2	Bourns Inc.	60V	300 mA	600 mA	760 mOhms	2.1 Ohms	Radial, Disc	Cut Tape (CT)	Active
MF-R030-2-17	Bourns Inc.	60V	300 mA	600 mA	760 mOhms	2.1 Ohms	Radial, Disc	Tape & Reel (TR)	Active
MF-R030-AP	Bourns Inc.	60V	300 mA	600 mA	760 mOhms	2.1 Ohms	Radial, Disc	Cut Tape (CT)	Active
MF-RX030/72-2-17	Bourns Inc.	72V	300 mA	600 mA	760 mOhms	2.1 Ohms	Radial, Disc	Tape & Reel (TR)	Active
RXEF017-AP	Littelfuse	60V	170 mA	340 mA	3.3 Ohms	8 Ohms	Radial, Disc	Cut Tape (CT)	Active
PFRA.030.2	SCHURTER Inc.	60V	300 mA	600 mA	760 mOhms	2.1 Ohms	Radial, Disc	Cut Tape (CT)	Active

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

MF-R030-2, MF-R030-2-17, MF-R030-AP, and PFRA.030.2 are parametric equivalents with identical electrical specifications. All are currently in active product status with ROHS3 compliance. MF-R030-2 and MF-R030-AP are available in Cut Tape packaging, while MF-R030-2-17 is supplied in Tape & Reel format with AEC-Q200 automotive qualification. PFRA.030.2 is manufactured by SCHURTER Inc. and maintains identical electrical and mechanical parameters. Selection among these equivalents depends on packaging requirements and procurement volume.

For Voltage-Rated Upgrade:

MF-RX030/72-2-17 maintains all electrical specifications of the original part while providing 72V maximum voltage rating instead of 60V. This part is suitable for applications requiring higher voltage margin. It is supplied in Tape & Reel format with AEC-Q200 automotive qualification and active product status.

For Current-Reduced Applications:

RXEF017-AP from Littelfuse is a similar part with identical 60V voltage rating and package configuration but with reduced hold current of 170 mA and trip current of 340 mA. This part is suitable only for applications where the lower current specification is acceptable. It carries broader approval agency certifications (CQC, CSA, TUV, UL) compared to the original part.

Frequently Asked Questions (FAQ)

Q: Can MF-R030-2 be used as a direct replacement for MF-R030-2-99?

A: Yes. MF-R030-2 is a parametric equivalent with identical electrical specifications (60V, 300 mA hold current, 600 mA trip current, 760 mOhms initial resistance, 2.1 Ohms post-trip resistance) and mechanical dimensions. The primary difference is packaging format and active product status. Both are ROHS3 compliant with cURus and TUV approval.

Q: What is the difference between MF-R030-2 and MF-R030-2-17?

A: Both parts are parametric equivalents with identical electrical specifications. MF-R030-2 is supplied in Cut Tape (CT) packaging, while MF-R030-2-17 is supplied in Tape & Reel (TR) format. MF-R030-2-17 includes AEC-Q200 automotive qualification and expanded approval agency certifications (cUL, cURus, TUV, UL).

Q: Can MF-RX030/72-2-17 be used in place of MF-R030-2-99?

A: MF-RX030/72-2-17 is electrically compatible with identical current and resistance specifications but rated for 72V maximum voltage instead of 60V. It can be used in applications designed for 60V operation, providing additional voltage margin. Mechanical dimensions and lead spacing are identical.

Q: Why does RXEF017-AP have different current ratings?

A: RXEF017-AP is a similar part from Littelfuse with 170 mA hold current and 340 mA trip current, compared to 300 mA and 600 mA respectively for the original part. This part is suitable only for applications where the lower current specification meets design requirements. Initial and post-trip resistance values also differ.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status. Approval agency certifications vary: Bourns parts carry cURus and TUV approval, with MF-R030-2-17 and MF-RX030/72-2-17 including additional cUL and UL certifications. SCHURTER PFRA.030.2 carries cURus and TUV approval. Littelfuse RXEF017-AP carries CQC, CSA, TUV, and UL approval.

Q: What packaging options are available for parametric equivalents?

A: Parametric equivalents are available in two packaging formats: Cut Tape (CT) for MF-R030-2, MF-R030-AP, and PFRA.030.2, and Tape & Reel (TR) for MF-R030-2-17 and MF-RX030/72-2-17. Packaging selection depends on assembly process requirements and procurement volume.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message