RUEF090-1 Equivalent & Substitute Parts Reference

Part Overview

The Littelfuse Inc. RUEF090-1 is a polymeric PTC (Positive Temperature Coefficient) resettable fuse with a maximum voltage rating of 30V and a hold current of 900 mA. Configured in a through-hole, radial, disc package, this component is designed for overcurrent protection in electronic circuits. The part is classified as obsolete, creating a need for suitable alternative and equivalent models that satisfy identical electrical, mechanical, and regulatory requirements as specified in the provided parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	RUEF090-1
Voltage - Max	30V
Current - Hold (Ih) (Max)	900 mA
Current - Trip (It)	1.8 A
Current - Max	100 A
Time to Trip	5.9 s
Resistance - Initial (Ri) (Min)	70 mOhms
Resistance - Post Trip (R1) (Max)	220 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.291" L x 0.118" W (7.40mm x 3.00mm)
Height - Seated (Max)	0.480" (12.20mm)
Lead Spacing	0.199" (5.05mm)
Approval Agency	CQC, CSA, TUV, UL
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitutes for Littelfuse RUEF090-1 are identified strictly by matching or exceeding all specified electrical parameters—maximum voltage, hold current, trip current, max current, time to trip, and resistance values—along with identical mechanical configuration, mounting type, lead spacing, and package dimensions. Regulatory approval and RoHS/REACH compliance status are matched to ensure functional and regulatory equivalence within the PTC resettable fuse category.

The key parameters for substitution are:

Voltage - Max
Current - Hold (Ih) (Max)
Current - Trip (It)
Current - Max
Time to Trip
Resistance - Initial (Ri) (Min)
Resistance - Post Trip (R1) (Max)
Operating Temperature
Mounting Type
Package / Case
Size / Dimension
Lead Spacing
Approval Agency
RoHS Status
REACH Status

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Current - Max	Time to Trip	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Operating Temp	Mounting Type	Package / Case	Size / Dimension	Height - Seated (Max)	Lead Spacing	Approval Agency	RoHS Status	REACH Status
RUEF090-1	Littelfuse Inc.	30V	900 mA	1.8 A	100 A	5.9 s	70 mOhms	220 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.291" L x 0.118" W (7.40mm x 3.00mm)	0.480" (12.20mm)	0.199" (5.05mm)	CQC, CSA, TUV, UL	ROHS3 Compliant	REACH Unaffected
RUEF090	Littelfuse	30V	900 mA	1.8 A	100 A	5.9 s	70 mOhms	220 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.291" Dia x 0.118" T (7.40mm x 3.00mm)	0.480" (12.20mm)	0.199" (5.05mm)	CQC, CSA, TUV, UL	ROHS3 Compliant	REACH Unaffected
FRU090-30F	RFE/Fuzetec	30V	900 mA	1.8 A	100 A	5.9 s	70 mOhms	220 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.291" L x 0.118" W (7.40mm x 3.00mm)	0.480" (12.20mm)	0.201" (5.10mm)	cUL, TUV, UL	ROHS3 Compliant	REACH Unaffected
RS30-090	OptiFuse	30V	900 mA	1.8 A	100 A	5.9 s	70 mOhms	220 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.291" L x 0.118" W (7.40mm x 3.00mm)	0.480" (12.20mm)	0.201" (5.10mm)	cULus, TUV	ROHS3 Compliant	REACH Unaffected

Engineering Selection Recommendations

RUEF090-1 is classified as obsolete. The listed substitute parts (Littelfuse RUEF090, RFE/Fuzetec FRU090-30F, and OptiFuse RS30-090) all provide equivalent or better status in terms of product availability and maintain compliance with ROHS3 and REACH standards. Each substitute part includes regulatory certification from at least two recognized approval agencies. All substitute parts are stocked as new original inventory and meet the same lead spacing, package configuration, and electrical performance criteria specified. These substitutes maintain consistency in compliance and mechanical form factor relevant for the PTC resettable fuse category.

Frequently Asked Questions (FAQ)

Q: What key parameters are critical for substituting a PTC resettable fuse in this category?
A: Voltage - Max, Current - Hold (Ih) (Max), Current - Trip (It), Current - Max, Time to Trip, Resistance values, Operating Temperature, Mounting Type, Package dimensions, Lead Spacing, and regulatory certifications are critical for valid substitution.

Q: Are the provided substitutes compatible in terms of mechanical mounting and size?
A: Yes, all substitutes specify through-hole, radial, disc packaging and matching or nearly identical dimensions and lead spacing to the original RUEF090-1.

Q: What about certification and compliance?
A: All substitutes provide at least two major agency approvals (such as UL, TUV, cUL, or CQC) and comply with ROHS3 and REACH requirements as indicated.

Q: Can substitutes be interchanged without additional modifications?
A: Substitute parts present matching parameters including operating temperature, electrical ratings, physical dimensions, and mounting configuration, allowing for direct interchange within existing board layouts specified for RUEF090-1.

Q: How is substitute equivalency determined in this case?
A: Equivalency is strictly determined by matching all relevant electrical, mechanical, and regulatory parameters as listed in the provided tables and input data.

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