RXEF020-1 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RXEF020-1 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 72V maximum voltage with a 200 mA hold current. This component is designed for overcurrent protection in through-hole radial disc configurations. The RXEF020-1 is currently listed as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The substitute RXEF020 provides functional continuity with identical electrical and mechanical specifications while maintaining active product status.

Substiute Parts

RXEF020-1

Littelfuse Inc.In Stock: 1095RXEF020-1 Datasheet

Current PartRFQ

RXEF020

Littelfuse Inc.In Stock: 10155RXEF020 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RXEF020-1 with the RXEF020 is based on identical electrical and mechanical parameters across all critical specifications. The substitution criteria are:

• Voltage rating: 72V maximum (identical)
• Hold current: 200 mA (identical)
• Trip current: 400 mA (identical)
• Maximum current: 40 A (identical)
• Time to trip: 2.2 s (identical)
• Initial resistance: 1.83 Ohms minimum (identical)
• Post-trip resistance: 4.4 Ohms maximum (identical)
• Operating temperature range: -40°C ~ 85°C (identical)
• Mounting configuration: Through hole radial disc (identical)
• Physical dimensions: 0.291" Dia x 0.118" T / 7.40mm x 3.00mm (identical)
• Lead spacing: 0.199" (5.05mm) (identical)
• Regulatory compliance: CQC, CSA, TUV, UL certifications (identical)
• RoHS status: ROHS3 Compliant (identical)

The RXEF020 differs only in packaging format (Bag versus unspecified for RXEF020-1) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The RXEF020 is the direct functional equivalent of the RXEF020-1. Selection of RXEF020 is based on the following engineering criteria:

• All electrical parameters are identical, ensuring equivalent circuit protection performance
• All mechanical dimensions and lead spacing are identical, ensuring direct PCB compatibility
• Both components maintain identical regulatory certifications (CQC, CSA, TUV, UL) and RoHS3 compliance
• The RXEF020 maintains active product status, ensuring long-term availability and supply chain continuity
• The RXEF020-1 is obsolete, making RXEF020 the appropriate selection for new designs and ongoing production

For applications currently using RXEF020-1, direct substitution with RXEF020 is supported without circuit redesign or board layout modification.

Frequently Asked Questions (FAQ)

Q: Can RXEF020 directly replace RXEF020-1 in existing designs?

A: Yes. The RXEF020 is electrically and mechanically identical to RXEF020-1. All electrical parameters, physical dimensions, lead spacing, and regulatory certifications match exactly. Direct substitution is supported without circuit modification.

Q: What is the difference between RXEF020-1 and RXEF020?

A: The primary difference is product status. RXEF020-1 is obsolete, while RXEF020 is active. The packaging format differs (RXEF020-1 packaging is unspecified; RXEF020 is supplied in Bag format). All electrical and mechanical specifications are identical.

Q: Are the regulatory certifications the same?

A: Yes. Both RXEF020-1 and RXEF020 carry identical certifications: CQC, CSA, TUV, and UL. Both are ROHS3 compliant and REACH unaffected.

Q: What are the critical parameters for substitution?

A: The critical parameters are voltage rating (72V), hold current (200 mA), trip current (400 mA), operating temperature range (-40°C ~ 85°C), physical dimensions (0.291" Dia x 0.118" T), lead spacing (0.199"), and mounting type (through hole radial disc). All these parameters are identical between the two parts.

Q: Is there any performance difference between these parts?

A: No. The electrical performance characteristics, including time to trip (2.2 s), initial resistance (1.83 Ohms minimum), and post-trip resistance (4.4 Ohms maximum), are identical.

Q: Why should I use RXEF020 instead of RXEF020-1?

A: RXEF020 should be used because it maintains active product status, ensuring continued availability and supply chain support. RXEF020-1 is obsolete and may become unavailable for future procurement.