72R075XPR Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The 72R075XPR is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the POLY-FUSE® 72R series. This through-hole radial disc component provides overcurrent protection at 72V with a 750 mA hold current rating. The device is designed for automatic reset functionality, restoring circuit operation once the fault condition is cleared. As an active product with full regulatory compliance, substitute parts may be required due to inventory availability, lead time optimization, or design standardization across manufacturing facilities.

Substiute Parts

72R075XPR

Littelfuse Inc.In Stock: 181672R075XPR Datasheet

Current PartRFQ

RXEF075-AP

LittelfuseIn Stock: 5865RXEF075-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 72R075XPR is determined by strict equivalence across the following critical parameters:

Voltage rating must equal 72V maximum. Current hold (Ih) must equal 750 mA. Current trip (It) must equal 1.5 A. Time to trip must equal 6.3 seconds. Resistance specifications must match: initial resistance minimum of 250 mOhms and post-trip resistance maximum of 600 mOhms. Operating temperature range must span -40°C to 85°C. Mounting type must be through hole with radial disc package configuration. Product status must be active. RoHS3 compliance is required.

The RXEF075-AP from Littelfuse meets all substitution criteria. Both components are polymeric PTC resettable fuses with identical electrical performance characteristics, regulatory compliance status, and mechanical compatibility for through-hole radial mounting applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 72R075XPR and RXEF075-AP are active products from Littelfuse with full ROHS3 compliance and equivalent regulatory certifications. The 72R075XPR carries cURus and TUV approvals, while the RXEF075-AP carries CQC, CSA, TUV, and UL approvals. Selection between these components should be based on design certification requirements and regional compliance mandates. The RXEF075-AP offers broader approval agency coverage, which may be advantageous for applications requiring multiple regional certifications. Both components are suitable for direct substitution in 72V, 750 mA polymeric PTC resettable fuse applications with identical electrical and thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the RXEF075-AP replace the 72R075XPR in existing designs?

A: Yes. Both components are electrically and mechanically equivalent. All critical parameters including voltage rating, current hold, trip current, time to trip, resistance specifications, and operating temperature range are identical. Through-hole radial disc mounting is identical.

Q: Are there dimensional differences between these parts?

A: Minor dimensional variations exist within acceptable tolerances. The 72R075XPR has a thickness of 0.122" (3.10mm) and lead spacing of 0.201" (5.10mm). The RXEF075-AP has a thickness of 0.118" (3.00mm) and lead spacing of 0.199" (5.05mm). Both maintain the same seated height of 0.598" (15.20mm) and diameter of 0.402" (10.20mm). These variations are within standard PCB design tolerances for through-hole radial components.

Q: What regulatory certifications apply to each part?

A: The 72R075XPR holds cURus and TUV certifications. The RXEF075-AP holds CQC, CSA, TUV, and UL certifications. Both are ROHS3 compliant and REACH unaffected. Selection should align with regional certification requirements for the target application.

Q: Are both parts available in the same packaging format?

A: Yes. Both components are supplied in Cut Tape (CT) packaging, suitable for automated assembly processes.

Q: What is the functional difference between these polymeric PTC resettable fuses?

A: There is no functional difference. Both components provide identical overcurrent protection characteristics with automatic reset capability at 72V, 750 mA hold current, and 1.5 A trip current.