RXE050-2 Equivalent & Substitute Parts

Part Overview

The RXE050-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® RXE series. This component is rated for 72V maximum voltage with a 500 mA hold current and 1 A trip current, designed for through-hole radial mounting in disc configuration. The RXE050-2 is currently classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Key Parameters

Parameter	Value
Voltage - Max	72V
Current - Hold (Ih) (Max)	500 mA
Current - Trip (It)	1 A
Current - Max	40 A
Time to Trip	4 s
Resistance - Initial (Ri) (Min)	500 mOhms
Resistance - Post Trip (R1) (Max)	1.17 Ohms
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.311" Dia x 0.118" T (7.90mm x 3.00mm)
Lead Spacing	0.199" (5.05mm)

Substitute Part Grouping Explanation

Substitute parts for the RXE050-2 are determined by strict equivalence across the following critical parameters:

Voltage rating: 72V maximum
Current hold specification: 500 mA
Current trip specification: 1 A
Resistance characteristics: Initial minimum 500 mOhms, post-trip maximum 1.17 Ohms
Physical form factor: Through-hole radial disc configuration
Dimensional compatibility: 0.311" diameter x 0.118" thickness, 0.199" lead spacing

The substitute parts RXEF050-2, RXEF050-AP, and RXEF050S-AP meet all these electrical and mechanical parameters. These parts belong to the active PolySwitch® RXEF series and represent direct functional equivalents to the obsolete RXE050-2.

Parameter Comparison

Parameter	RXE050-2	RXEF050-2	RXEF050-AP	RXEF050S-AP
Manufacturer	Littelfuse Inc.	Littelfuse	Littelfuse	Littelfuse
Series	PolySwitch® RXE	PolySwitch® RXEF	PolySwitch® RXEF	PolySwitch® RXEF
Product Status	Obsolete	Active	Active	Active
Voltage - Max	72V	72V	72V	72V
Current - Hold (Ih) (Max)	500 mA	500 mA	500 mA	500 mA
Current - Trip (It)	1 A	1 A	1 A	1 A
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	4 s	4 s	4 s	4 s
Resistance - Initial (Ri) (Min)	500 mOhms	500 mOhms	500 mOhms	500 mOhms
Resistance - Post Trip (R1) (Max)	1.17 Ohms	1.17 Ohms	1.17 Ohms	1.17 Ohms
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.311" Dia x 0.118" T (7.90mm x 3.00mm)	0.311" Dia x 0.118" T (7.90mm x 3.00mm)	0.311" Dia x 0.118" T (7.90mm x 3.00mm)	0.311" Dia x 0.118" T (7.90mm x 3.00mm)
Lead Spacing	0.199" (5.05mm)	0.199" (5.05mm)	0.199" (5.05mm)	0.199" (5.05mm)
Operating Temperature	Not specified	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	CQC, CSA, TUV, UL	CQC, CSA, TUV, UL	CQC, CSA, TUV, UL
Inventory Status	1000 Pcs New Original In Stock	37270 Pcs New Original In Stock	19239 Pcs New Original In Stock	4899 Pcs New Original In Stock

Engineering Selection Recommendations

All three substitute parts—RXEF050-2, RXEF050-AP, and RXEF050S-AP—are functionally equivalent to the RXE050-2 across all critical electrical and mechanical parameters. The primary distinctions are:

Product Status: The substitute parts are active components in the PolySwitch® RXEF series, whereas the RXE050-2 is obsolete. Selection of an active part ensures long-term availability and supply chain continuity.

Compliance and Certifications: The substitute parts carry ROHS3 compliance, whereas the RXE050-2 is RoHS non-compliant. All substitute parts maintain the same regulatory approvals (CSA, TUV, UL) as the original, with the addition of CQC certification.

Packaging: RXEF050-2, RXEF050-AP, and RXEF050S-AP are supplied in Cut Tape (CT) packaging, which differs from the original RXE050-2 packaging designation. This affects procurement and handling but does not impact electrical or mechanical performance.

Inventory Availability: RXEF050-2 offers the highest stock level at 37,270 pieces, followed by RXEF050-AP at 19,239 pieces and RXEF050S-AP at 4,899 pieces.

Frequently Asked Questions (FAQ)

Q: Are RXEF050-2, RXEF050-AP, and RXEF050S-AP direct replacements for RXE050-2?

A: Yes. All three parts are parametrically equivalent across voltage rating (72V), current hold (500 mA), current trip (1 A), resistance characteristics, and physical form factor. They are suitable for direct substitution in through-hole radial disc applications.

Q: What is the difference between RXEF050-2, RXEF050-AP, and RXEF050S-AP?

A: All three parts share identical electrical specifications and physical dimensions. The differences are in packaging format (all supplied in Cut Tape), inventory levels, and minor designation variations within the RXEF series. Selection among these three should be based on availability and procurement requirements.

Q: Does the RoHS3 compliance of substitute parts affect compatibility?

A: No. RoHS3 compliance is a material composition standard that does not alter electrical performance or mechanical fit. The substitute parts maintain all functional characteristics of the RXE050-2 while meeting current environmental regulations.

Q: Are the substitute parts approved by the same regulatory agencies?

A: The substitute parts carry CSA, TUV, and UL approvals matching the RXE050-2, with the addition of CQC certification. All required regulatory approvals are maintained.

Q: What is the operating temperature range for the substitute parts?

A: The substitute parts are rated for -40°C to 85°C operating temperature. The RXE050-2 operating temperature was not specified in available documentation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message