MF-RG300-AP Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The MF-RG300-AP is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-RG series. This through-hole radial disc component is rated for 16V maximum voltage with a 3A hold current and is designed for overcurrent protection applications. The part is currently active in production and available in tape and box packaging with 660 pieces in stock. Substitute parts are necessary to address supply chain requirements, packaging preferences, or design flexibility across equivalent electrical and mechanical specifications.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	3 A
Current - Trip (It)	5.1 A
Current - Max	100 A
Time to Trip	1 s
Resistance - Initial (Ri) (Min)	38 mOhms
Resistance - Post Trip (R1) (Max)	97.5 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Type	Polymeric
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MF-RG300-AP are qualified based on strict electrical and mechanical parameter matching. The critical parameters that determine substitution eligibility are:

Voltage - Max: 16V
Current - Hold (Ih) (Max): 3 A
Current - Trip (It): 5.1 A
Resistance - Initial (Ri) (Min): 38 mOhms
Resistance - Post Trip (R1) (Max): 97.5 mOhms
Operating Temperature: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: Radial, Disc
Type: Polymeric

Two substitute parts meet these criteria: RGEF300-2 (Littelfuse PolySwitch® series) and 16R300GPR (Littelfuse POLY-FUSE® series). Both maintain identical electrical performance specifications and polymeric construction while offering alternative packaging and dimensional options.

Parameter Comparison

Parameter	MF-RG300-AP (Bourns)	RGEF300-2 (Littelfuse)	16R300GPR (Littelfuse)
Voltage - Max	16V	16V	16V
Current - Hold (Ih) (Max)	3 A	3 A	3 A
Current - Trip (It)	5.1 A	5.1 A	5.1 A
Current - Max	100 A	100 A	100 A
Time to Trip	1 s	1 s	1 s
Resistance - Initial (Ri) (Min)	38 mOhms	38 mOhms	38 mOhms
Resistance - Post Trip (R1) (Max)	97.5 mOhms	97.5 mOhms	97.5 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Type	Polymeric	Polymeric	Polymeric
Series	Multifuse® MF-RG	PolySwitch® RGEF	POLY-FUSE® 16R
Packaging	Tape & Box (TB)	Cut Tape (CT)	Cut Tape (CT)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts—MF-RG300-AP, RGEF300-2, and 16R300GPR—are active products with ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on packaging requirements and certification scope:

RGEF300-2 provides the broadest certification coverage with CSA, TUV, and UL approvals, making it suitable for applications requiring multiple regulatory certifications. The part is available in cut tape packaging with 5200 pieces in stock.

16R300GPR offers cURus and TUV certifications and maintains identical physical dimensions to the MF-RG300-AP (0.280" L x 0.118" W, 7.10mm x 3.00mm), with 1239 pieces available in cut tape packaging. This option is optimal when physical footprint consistency is critical.

MF-RG300-AP remains the primary choice when tape and box packaging is specified, with 660 pieces currently available.

Frequently Asked Questions (FAQ)

Q: Can RGEF300-2 be used as a direct replacement for MF-RG300-AP in existing designs?

A: Yes. RGEF300-2 meets all electrical specifications (16V, 3A hold current, 5.1A trip current, 38 mOhms initial resistance, 97.5 mOhms post-trip resistance) and operates across the same temperature range (-40°C to 85°C). Physical dimensions differ slightly (0.260" L x 0.098" W versus 0.280" L x 0.118" W), so PCB layout verification is required.

Q: What is the difference between RGEF300-2 and 16R300GPR?

A: Both parts are electrically identical. 16R300GPR maintains the same physical dimensions as MF-RG300-AP (0.280" L x 0.118" W), while RGEF300-2 has slightly smaller dimensions (0.260" L x 0.098" W). RGEF300-2 includes CSA certification in addition to TUV and UL; 16R300GPR includes cURus and TUV certifications.

Q: Are there packaging differences between these parts?

A: Yes. MF-RG300-AP is supplied in tape and box (TB) packaging. Both RGEF300-2 and 16R300GPR are supplied in cut tape (CT) packaging. Packaging selection affects handling, storage, and automated assembly compatibility.

Q: Do all three parts have the same lead spacing?

A: MF-RG300-AP and 16R300GPR both have 0.201" (5.10mm) lead spacing. RGEF300-2 has 0.199" (5.05mm) lead spacing. This minor difference is within standard PCB tolerance but should be verified during design validation.

Q: What certifications apply to each part?

A: MF-RG300-AP has no listed approval agencies. RGEF300-2 carries CSA, TUV, and UL approvals. 16R300GPR carries cURus and TUV approvals. Select based on regulatory requirements for your application.

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