RGE800 Equivalent & Substitute Parts

Part Overview

The RGE800 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® series, rated for 16V maximum voltage and 8A hold current. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds the trip threshold, then resetting when the fault condition is removed. The obsolete status of the RGE800 necessitates evaluation of active substitute parts that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	RGE800
Voltage - Max	16V
Current - Hold (Ih) (Max)	8 A
Current - Trip (It)	13.6 A
Current - Max	100 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	6 mOhms
Resistance - Post Trip (R1) (Max)	18 mOhms
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.480" L x 0.098" W (12.20mm x 2.50mm)
Lead Spacing	0.199" (5.05mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the RGE800 is determined by the following critical parameters:

Voltage Rating: Maximum voltage must be 16V or greater
Current - Hold (Ih): Must be rated for 8A or greater
Current - Trip (It): Must be 13.6A or greater
Mounting Type: Must be Through Hole
Package / Case: Must be Radial, Disc configuration
Lead Spacing: Must accommodate 0.199" (5.05mm) spacing or compatible PCB layouts

Two active substitute parts meet these criteria: RGEF800 (Littelfuse Inc.) and 0ZRA0800FF1A (Bel Fuse Inc.). Both maintain the core electrical specifications and physical form factor required for direct substitution.

Parameter Comparison

Parameter	RGE800	RGEF800	0ZRA0800FF1A
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bel Fuse Inc.
Product Status	Obsolete	Active	Active
Voltage - Max	16V	16V	16V
Current - Hold (Ih) (Max)	8 A	8 A	8 A
Current - Trip (It)	13.6 A	13.6 A	13.6 A
Current - Max	100 A	100 A	100 A
Time to Trip	5 s	5 s	9 s
Resistance - Initial (Ri) (Min)	6 mOhms	5.6 mOhms	5 mOhms
Resistance - Post Trip (R1) (Max)	18 mOhms	17.5 mOhms	18 mOhms
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.480" L x 0.098" W (12.20mm x 2.50mm)	0.480" L x 0.098" W (12.20mm x 2.50mm)	0.500" L x 0.118" W (12.70mm x 3.00mm)
Lead Spacing	0.199" (5.05mm)	0.199" (5.05mm)	0.201" (5.10mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	Not specified	CSA, TUV, UL	cURus, TUV

Engineering Selection Recommendations

RGEF800 is the primary substitute for the RGE800. Both parts are manufactured by Littelfuse Inc. and share identical electrical ratings and physical dimensions. The RGEF800 is active in production with ROHS3 compliance and certifications from CSA, TUV, and UL. Initial resistance is marginally lower (5.6 mOhms vs. 6 mOhms), and post-trip resistance is slightly lower (17.5 mOhms vs. 18 mOhms), both within acceptable tolerance for direct substitution.

0ZRA0800FF1A is an alternative substitute manufactured by Bel Fuse Inc. This part maintains identical voltage, hold current, and trip current specifications. Physical dimensions differ slightly (0.500" L x 0.118" W vs. 0.480" L x 0.098" W), and lead spacing is marginally different (0.201" vs. 0.199"). Time to trip is longer at 9 seconds compared to 5 seconds. This part carries AEC-Q200 automotive qualification and ROHS3 compliance with cURus and TUV certifications. PCB layout verification is required due to dimensional variations.

Frequently Asked Questions (FAQ)

Q: Can RGEF800 be used as a direct replacement for RGE800?

A: Yes. RGEF800 maintains identical electrical ratings (16V, 8A hold current, 13.6A trip current) and physical form factor (Radial, Disc, Through Hole). Resistance parameters are within acceptable tolerance. RGEF800 is active in production with enhanced compliance certifications.

Q: What is the key difference between RGEF800 and 0ZRA0800FF1A?

A: Both parts meet the core electrical specifications. RGEF800 has identical physical dimensions to RGE800 (0.480" L x 0.098" W). The 0ZRA0800FF1A is slightly larger (0.500" L x 0.118" W) with a longer trip time (9s vs. 5s). Lead spacing differs marginally (0.201" vs. 0.199"). PCB layout compatibility must be verified for 0ZRA0800FF1A.

Q: Are there compliance differences between the substitutes?

A: Yes. RGEF800 carries CSA, TUV, and UL certifications with ROHS3 compliance. The 0ZRA0800FF1A carries cURus and TUV certifications with AEC-Q200 automotive qualification and ROHS3 compliance. The original RGE800 is RoHS non-compliant. Selection depends on application requirements and regulatory standards.

Q: Does the 9-second trip time of 0ZRA0800FF1A affect compatibility?

A: The 0ZRA0800FF1A has a longer trip time (9s) compared to RGE800 and RGEF800 (5s). This affects the speed of overcurrent response. Application circuit behavior must be evaluated to determine if this difference is acceptable for your specific use case.

Q: What packaging is available for each substitute?

A: RGEF800 is supplied in Bag packaging. The 0ZRA0800FF1A is supplied in Box packaging. RGE800 packaging is not specified. Verify packaging requirements for your procurement and assembly processes.

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