RXEF020-AP Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The RXEF020-AP is a polymeric PTC resettable fuse manufactured by Littelfuse, rated for 72V maximum voltage with a 200 mA hold current. This component is designed for overcurrent protection in electronic circuits, automatically resetting after a fault condition is cleared. The part is currently in active production status with 1986 units in stock. Substitute parts are identified when electrical specifications, mechanical dimensions, and compliance certifications align with the original component's operational requirements.

Substiute Parts

RXEF020-AP

LittelfuseIn Stock: 2042RXEF020-AP Datasheet

Current PartRFQ

72R020XPR

LittelfuseIn Stock: 270972R020XPR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 72R020XPR qualifies as a direct substitute for the RXEF020-AP based on the following critical parameters:

• Identical voltage rating: 72V maximum
• Identical hold current specification: 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 type: Through Hole
• Identical package type: Radial, Disc
• Both components are ROHS3 compliant and REACH unaffected

Physical dimensions show negligible variation (thickness tolerance of 0.01 inches and lead spacing tolerance of 0.002 inches), which does not affect functional interchangeability in standard circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the RXEF020-AP and 72R020XPR are active production components from Littelfuse with full ROHS3 compliance and REACH unaffected status. The 72R020XPR carries TUV and cURus certifications, while the RXEF020-AP carries CQC, CSA, TUV, and UL certifications. Selection between these parts should be based on specific circuit certification requirements. If UL or CSA certification is mandatory for the end application, the RXEF020-AP is the appropriate choice. If TUV and cURus certifications satisfy application requirements, the 72R020XPR is functionally equivalent. Both components are suitable for 72V systems requiring 200 mA hold current protection with identical electrical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 72R020XPR replace the RXEF020-AP in existing designs?

A: Yes. Both components share identical electrical specifications including voltage rating, hold current, trip current, resistance values, and operating temperature range. The physical dimensions are functionally equivalent for through-hole radial mounting applications.

Q: Are there certification differences between these parts?

A: Yes. The RXEF020-AP includes UL and CSA certifications in addition to TUV and CQC. The 72R020XPR carries TUV and cURus certifications. Verify that the substitute part's certifications meet your application's regulatory requirements before implementation.

Q: What is the significance of the minor dimensional variations?

A: The thickness difference of 0.01 inches (0.10mm) and lead spacing difference of 0.002 inches (0.05mm) are within standard manufacturing tolerances for radial disc components and do not affect circuit board layout or functional performance in standard applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the RXEF020-AP and 72R020XPR are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations.

Q: What inventory considerations apply to these substitutes?

A: The RXEF020-AP has 1986 units in stock, while the 72R020XPR has 2670 units in stock. Both are available in Cut Tape packaging and are in active production status.