Equivalent & Substitute Parts for RGEF300-2

Part Overview

The RGEF300-2 is a Littelfuse PolySwitch® polymeric PTC resettable fuse rated for 16V maximum voltage with a 3A hold current (Ih). This through-hole radial disc component is designed for overcurrent protection in electronic circuits and is currently in active product status. Substitute parts are identified based on matching electrical ratings, mechanical compatibility, and thermal characteristics to ensure functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value
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
Time to Trip	1 s
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RGEF300-2 are categorized based on electrical parameter matching. The primary substitution criterion is equivalence in voltage rating (16V maximum), hold current (3A), trip current (5.1A), and initial resistance (38 mOhms minimum). All identified substitutes maintain the same operating temperature range (-40°C to 85°C) and through-hole radial mounting configuration.

Substitutes are grouped into two categories:

Parametric Equivalents (Identical Electrical Ratings): Parts matching all critical electrical parameters including 16V voltage, 3A hold current, 5.1A trip current, and 38 mOhms initial resistance.

Similar Parts (Different Current Ratings): Parts with the same 16V voltage rating and through-hole radial package but with different hold current ratings (5A or 11A), suitable only when circuit requirements permit higher current thresholds.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Operating Temperature	Mounting Type	Package / Case	Time to Trip	RoHS Status	Product Status
RGEF300-2	Littelfuse	16V	3 A	5.1 A	38 mOhms	97.5 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	1 s	ROHS3 Compliant	Active
MF-RG300-0	Bourns Inc.	16V	3 A	5.1 A	38 mOhms	97.5 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	1 s	ROHS3 Compliant	Active
MF-RG300-2	Bourns Inc.	16V	3 A	5.1 A	38 mOhms	97.5 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	1 s	ROHS3 Compliant	Active
MF-RG500-0	Bourns Inc.	16V	5 A	8.5 A	15 mOhms	34 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	2 s	ROHS3 Compliant	Active
MF-RG500-2	Bourns Inc.	16V	5 A	8.5 A	15 mOhms	34 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	2 s	ROHS3 Compliant	Active
MF-R1100	Bourns Inc.	16V	11 A	22 A	3 mOhms	14 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	20 s	ROHS3 Compliant	Active
PFRA.1100	SCHURTER Inc.	16V	11 A	22 A	3 mOhms	10 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	20 s	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

MF-RG300-0 and MF-RG300-2 from Bourns Inc. are parametric equivalents to the RGEF300-2. Both maintain identical voltage (16V), hold current (3A), trip current (5.1A), and initial resistance (38 mOhms) specifications. Both are ROHS3 compliant and active products. Selection between these and the RGEF300-2 may be based on packaging availability (bulk versus cut tape) and lead time.

Alternative Current Ratings (Circuit-Dependent Selection):

MF-RG500-0 and MF-RG500-2 provide 5A hold current with 8.5A trip current, suitable only for applications where the circuit can tolerate higher current thresholds than the 3A specification. These parts maintain 16V voltage compatibility and ROHS3 compliance.

MF-R1100 and PFRA.1100 provide 11A hold current with 22A trip current, applicable only in circuits designed for significantly higher current protection levels. Both maintain 16V voltage rating and ROHS3 compliance but differ in post-trip resistance characteristics.

All substitute parts maintain through-hole radial disc mounting compatibility and the -40°C to 85°C operating temperature range of the original RGEF300-2.

Frequently Asked Questions (FAQ)

Q: Can MF-RG300-0 or MF-RG300-2 be used as direct replacements for RGEF300-2?

A: Yes. Both Bourns MF-RG300 variants match all critical electrical parameters: 16V maximum voltage, 3A hold current, 5.1A trip current, and 38 mOhms initial resistance. Both are ROHS3 compliant and active products. Packaging format (bulk versus cut tape) is the primary selection difference.

Q: What is the difference between MF-RG300-2 and MF-RG500-2?

A: The MF-RG500-2 has a higher hold current rating (5A versus 3A) and trip current (8.5A versus 5.1A). It also has lower initial resistance (15 mOhms versus 38 mOhms) and longer trip time (2 seconds versus 1 second). Use MF-RG500-2 only if your circuit design permits higher current thresholds.

Q: Are MF-R1100 and PFRA.1100 suitable replacements for RGEF300-2?

A: No, not as direct replacements. Both have 11A hold current and 22A trip current, significantly higher than the RGEF300-2's 3A rating. These parts are suitable only for circuits designed to tolerate substantially higher current protection levels. They maintain 16V voltage compatibility and through-hole radial mounting.

Q: What packaging options are available for the 3A equivalent parts?

A: MF-RG300-0 is supplied in bulk packaging, while MF-RG300-2 is supplied in cut tape (CT) format. The RGEF300-2 is also available in cut tape. Packaging selection depends on assembly process requirements and inventory management.

Q: Do all substitute parts meet the same compliance standards as RGEF300-2?

A: All identified substitutes are ROHS3 compliant and REACH unaffected. Approval agencies vary: RGEF300-2 carries CSA, TUV, and UL approvals; Bourns MF-RG series carry TUV approval; SCHURTER PFRA.1100 carries cURus and TUV approvals. Verify specific certification requirements for your application.

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