Equivalent & Substitute Parts for RXE005

Part Overview

The RXE005 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with a 50 mA hold current. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The RXE005 series provides overcurrent protection through automatic resetting functionality in through-hole radial disc configuration.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	50 mA
Current - Trip (It)	100 mA
Current - Max	40 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	7.3 Ohms
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.315" Dia x 0.118" T (8.00mm x 3.00mm)
Lead Spacing	0.199" (5.05mm)

Substitute Part Grouping Explanation

Substitution eligibility for the RXE005 is determined by strict equivalence across the following critical parameters:

Voltage rating: 60V maximum
Hold current: 50 mA maximum
Trip current: 100 mA
Maximum current: 40 A
Time to trip: 5 seconds
Initial resistance: 7.3 Ohms minimum
Mounting configuration: Through hole radial disc
Physical dimensions: 0.315" diameter, compatible thickness and lead spacing

Two active alternatives meet these electrical and mechanical specifications: the RXEF005 (Littelfuse Inc., direct successor) and the MF-R005-0 (Bourns Inc., cross-manufacturer equivalent). Both maintain identical electrical performance characteristics and physical form factors within acceptable tolerance ranges.

Parameter Comparison

Parameter	RXE005	RXEF005	MF-R005-0
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Series	PolySwitch®, RXE	PolySwitch®, RXEF	Multifuse®, MF-R
Product Status	Obsolete	Active	Active
Voltage - Max	60V	60V	60V
Current - Hold (Ih) (Max)	50 mA	50 mA	50 mA
Current - Trip (It)	100 mA	100 mA	100 mA
Current - Max	40 A	40 A	40 A
Time to Trip	5 s	5 s	5 s
Resistance - Initial (Ri) (Min)	7.3 Ohms	7.3 Ohms	7.3 Ohms
Resistance - Post Trip (R1) (Max)	20 Ohms	20 Ohms	22 Ohms
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	0.315" Dia x 0.118" T (8.00mm x 3.00mm)	0.315" Dia x 0.118" T (8.00mm x 3.00mm)	0.315" Dia x 0.122" T (8.00mm x 3.10mm)
Height - Seated (Max)	0.327" (8.30mm)	0.327" (8.30mm)	0.327" (8.30mm)
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	CSA, TUV, UL	CQC, CSA, TUV, UL	cURus, TUV

Engineering Selection Recommendations

The RXEF005 is the direct manufacturer successor to the RXE005 from Littelfuse Inc. It maintains identical electrical specifications and physical dimensions while offering active product status, ROHS3 compliance, and expanded operating temperature range documentation (-40°C ~ 85°C). The RXEF005 carries broader regulatory approvals including CQC certification.

The MF-R005-0 from Bourns Inc. provides cross-manufacturer equivalence with identical electrical performance. Minor dimensional variations exist: thickness increases from 0.118" to 0.122" and lead spacing from 0.199" to 0.201". Post-trip resistance tolerance differs slightly (22 Ohms maximum versus 20 Ohms). The MF-R005-0 is ROHS3 compliant and carries cURus and TUV approvals.

Both alternatives are suitable for direct substitution in applications where the RXE005 was previously specified, provided PCB layout accommodates the minor dimensional tolerances of the selected alternative.

Frequently Asked Questions (FAQ)

Q: Can the RXEF005 directly replace the RXE005 in existing designs?

A: Yes. The RXEF005 maintains identical electrical ratings (60V, 50 mA hold current, 100 mA trip current) and physical form factor (0.315" diameter radial disc, through-hole mounting). It is the active successor product from the same manufacturer.

Q: What is the difference between the RXEF005 and MF-R005-0?

A: Both provide equivalent electrical performance. The RXEF005 is manufactured by Littelfuse Inc. and maintains exact dimensional specifications of the RXE005. The MF-R005-0 is manufactured by Bourns Inc. and exhibits minor dimensional variations: thickness of 0.122" (versus 0.118") and lead spacing of 0.201" (versus 0.199"). Post-trip resistance tolerance is 22 Ohms maximum for the MF-R005-0 compared to 20 Ohms for the RXEF005.

Q: Are there packaging differences between these alternatives?

A: Yes. The RXE005 was supplied in unspecified packaging. The RXEF005 is supplied in bag packaging. The MF-R005-0 is supplied in bulk packaging. Packaging selection should align with procurement and assembly requirements.

Q: Do all three parts meet current regulatory requirements?

A: The RXE005 is RoHS non-compliant. Both the RXEF005 and MF-R005-0 are ROHS3 compliant. For applications requiring RoHS compliance, either active alternative is suitable. The RXEF005 carries broader regulatory approvals (CQC, CSA, TUV, UL) compared to the MF-R005-0 (cURus, TUV).

Q: What is the operating temperature range for these components?

A: The RXE005 operating temperature is not specified in available documentation. Both the RXEF005 and MF-R005-0 are rated for -40°C ~ 85°C operation.

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