RXEF010-1 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RXEF010-1 is a Littelfuse PolySwitch® polymeric PTC resettable fuse designed for overcurrent protection in electronic circuits. This through-hole radial disc component provides automatic reset functionality without component replacement after a fault condition clears. The part is actively manufactured and widely stocked, with 1043 units currently available. Equivalent and substitute parts are identified to support procurement flexibility, design redundancy, and supply chain continuity.

Substiute Parts

RXEF010-1

LittelfuseIn Stock: 1074RXEF010-1 Datasheet

Current PartRFQ

RXEF010

LittelfuseIn Stock: 26384RXEF010 Datasheet

Parametric EquivalentRFQ

RXEF010S

Littelfuse Inc.In Stock: 1355RXEF010S Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RXEF010-1 are identified based on strict electrical and mechanical parameter matching within the PolySwitch® RXEF series. The substitution criteria are:

Electrical Parameters (Critical for Functionality):

• Voltage rating: 60V maximum
• Hold current (Ih): 100 mA
• Trip current (It): 200 mA
• Maximum current: 40 A
• Time to trip: 4 seconds
• Initial resistance (Ri): 2.5 Ohms minimum
• Post-trip resistance (R1): 7.5 Ohms maximum
• Operating temperature range: -40°C to 85°C

Mechanical Parameters (Critical for Installation):

• Mounting type: Through hole
• Package type: Radial, Disc
• Physical dimensions: 0.291" Dia x 0.118" T (7.40mm x 3.00mm)
• Height seated: 0.457" (11.60mm)
• Lead spacing: 0.199" (5.05mm)

Compliance Parameters:

• Approval agencies: CQC, CSA, TUV, UL
• RoHS status: ROHS3 Compliant
• Moisture sensitivity: Level 1

All identified substitutes match these parameters exactly and belong to the same PolySwitch® RXEF series from Littelfuse.

Parameter Comparison

Engineering Selection Recommendations

All three parts—RXEF010-1, RXEF010, and RXEF010S—are functionally equivalent and directly interchangeable in applications requiring a 60V, 100 mA hold current polymeric PTC resettable fuse with through-hole radial disc packaging.

Selection Basis:

All parts carry identical electrical specifications, mechanical dimensions, and regulatory certifications (CQC, CSA, TUV, UL). All are ROHS3 compliant and carry MSL Level 1 rating. All are actively manufactured by Littelfuse.

Inventory Considerations:

RXEF010 maintains the highest current inventory at 26,300 units, followed by RXEF010S at 1,307 units and RXEF010-1 at 1,043 units. Selection may be influenced by procurement lead times and supply chain requirements.

Compliance Status:

All three parts meet the same regulatory and environmental standards. RXEF010 and RXEF010S both carry documented REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8533.40.8070.

Frequently Asked Questions (FAQ)

Q: Are RXEF010, RXEF010S, and RXEF010-1 electrically identical?

A: Yes. All three parts share identical electrical parameters: 60V maximum voltage, 100 mA hold current, 200 mA trip current, 4-second trip time, and identical resistance specifications. They are direct functional equivalents.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All three parts have identical mechanical dimensions (0.291" Dia x 0.118" T), height (0.457"), and lead spacing (0.199"). They fit the same through-hole footprint without modification.

Q: What is the difference between RXEF010-1, RXEF010, and RXEF010S?

A: The parts are functionally and mechanically identical. Differences exist only in packaging designation and inventory levels. RXEF010 is the base part number with the highest stock availability.

Q: Are all three parts RoHS compliant?

A: Yes. All three parts are ROHS3 compliant and carry MSL Level 1 (unlimited moisture sensitivity level).

Q: Which part should I specify for new designs?

A: All three parts are suitable for new designs. Selection should be based on procurement availability and supply chain strategy. RXEF010 is recommended for maximum inventory availability.

Q: Do these parts require any special handling or storage?

A: All parts carry MSL Level 1 rating, indicating no special moisture sensitivity requirements. Standard component storage practices apply.

Q: Are these parts approved for use in regulated applications?

A: Yes. All three parts carry approvals from CQC, CSA, TUV, and UL, making them suitable for regulated applications requiring third-party certification.