RGE300 Equivalent & Substitute Parts

Part Overview

The RGE300 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 16V at 3A hold current with a 5.1A trip current. This component is designed for through-hole radial mounting in disc configuration. The RGE300 is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing design support and component procurement.

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
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.199" (5.05mm)
Approval Agency	CSA, TUV, UL

Substitute Part Grouping Explanation

Substitute parts for the RGE300 are identified based on the following critical electrical and mechanical parameters:

Voltage rating: 16V maximum
Current hold rating: 3A maximum
Current trip rating: 5.1A
Mounting configuration: Through hole radial disc
Lead spacing: 0.199" (5.05mm) nominal
Approval certifications: CSA, TUV, UL compatibility

The RGE300 has two identified substitutes: RGEF300 (Littelfuse) and 0ZRA0300FF1C (Bel Fuse Inc.). Both maintain the core electrical specifications and physical form factor required for direct replacement in existing circuit designs.

Parameter Comparison

Parameter	RGE300	RGEF300	0ZRA0300FF1C
Manufacturer	Littelfuse Inc.	Littelfuse	Bel Fuse Inc.
Product Status	Obsolete	Active	Active
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	2 s
Resistance - Initial (Ri) (Min)	38 mOhms	38 mOhms	34 mOhms
Resistance - Post Trip (R1) (Max)	Not specified	97.5 mOhms	105 mOhms
Operating Temperature	Not specified	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.260" L x 0.098" W (6.60mm x 2.50mm)	0.260" L x 0.098" W (6.60mm x 2.50mm)	0.280" L x 0.118" W (7.10mm x 3.00mm)
Height - Seated (Max)	0.433" (11.00mm)	0.433" (11.00mm)	0.433" (11.00mm)
Lead Spacing	0.199" (5.05mm)	0.199" (5.05mm)	0.201" (5.10mm)
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RGEF300 is the primary substitute for RGE300. Both components are manufactured by Littelfuse within the PolySwitch series, maintain identical electrical ratings and physical dimensions, and share the same approval certifications. RGEF300 is currently in active production status with ROHS3 compliance, addressing the obsolescence of the original RGE300.

0ZRA0300FF1C from Bel Fuse Inc. is an alternative substitute that meets the core electrical specifications. This component features a longer time-to-trip characteristic (2 seconds versus 1 second) and slightly different physical dimensions (0.280" L x 0.118" W versus 0.260" L x 0.098" W). The lead spacing tolerance is marginally different (0.201" versus 0.199"). This part carries AEC-Q200 automotive qualification and ROHS3 compliance. Physical dimension differences require verification of PCB layout compatibility before selection.

Frequently Asked Questions (FAQ)

Q: Can RGEF300 be used as a direct replacement for RGE300?

A: Yes. RGEF300 maintains identical voltage, current hold, current trip, and time-to-trip specifications. Physical dimensions and lead spacing are identical. Both components use through-hole radial disc mounting. RGEF300 is the recommended substitute due to active production status and identical electrical characteristics.

Q: What is the difference between RGEF300 and 0ZRA0300FF1C?

A: Both parts meet the 16V, 3A hold, 5.1A trip electrical requirements. Key differences include: RGEF300 has a 1-second trip time while 0ZRA0300FF1C has a 2-second trip time; physical dimensions differ slightly (RGEF300 is 0.260" L x 0.098" W, 0ZRA0300FF1C is 0.280" L x 0.118" W); lead spacing tolerance differs marginally (0.199" versus 0.201"). These differences may affect circuit behavior and PCB layout compatibility.

Q: Are there compliance differences between the substitutes?

A: RGEF300 and 0ZRA0300FF1C are both ROHS3 compliant, whereas RGE300 is RoHS non-compliant. Both substitutes maintain CSA, TUV, and UL certifications. 0ZRA0300FF1C additionally carries AEC-Q200 automotive qualification.

Q: Does the 2-second trip time of 0ZRA0300FF1C affect circuit operation?

A: The extended trip time may alter circuit protection response characteristics. Applications requiring the original 1-second trip time should use RGEF300. Applications with less stringent trip-time requirements may accommodate 0ZRA0300FF1C.

Q: Are physical dimension differences critical for PCB compatibility?

A: Lead spacing and body dimensions should be verified against PCB layout. RGEF300 matches RGE300 dimensions exactly. 0ZRA0300FF1C has slightly larger body dimensions and marginally different lead spacing, requiring PCB layout confirmation before substitution.

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