72R025XPR Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The 72R025XPR is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 72V maximum voltage with 250 mA hold current. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part functions as a thermal protection device in through-hole radial configuration, suitable for applications requiring automatic circuit protection with reset capability after fault conditions clear.

Substiute Parts

72R025XPR

Littelfuse Inc.In Stock: 88572R025XPR Datasheet

Current PartRFQ

RXEF025-AP

Littelfuse Inc.In Stock: 1532RXEF025-AP Datasheet

DirectRFQ

RXEF025-2

Littelfuse Inc.In Stock: 6398RXEF025-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 72R025XPR is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage rating: 72V maximum
• Hold current: 250 mA maximum
• Trip current: 500 mA
• Time to trip: 2.5 seconds
• Initial resistance: 1.25 Ohms minimum
• Post-trip resistance: 3 Ohms maximum
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through hole radial disc package
• Physical dimensions: 0.291" diameter with radial lead spacing

The substitute parts RXEF025-AP and RXEF025-2 meet all electrical specifications and mechanical compatibility requirements. Both are manufactured by Littelfuse Inc. and maintain identical functional parameters to the obsolete 72R025XPR.

Parameter Comparison

Engineering Selection Recommendations

Both RXEF025-AP and RXEF025-2 are direct functional equivalents to the obsolete 72R025XPR. Selection between these two active alternatives should be based on:

RXEF025-2 is the manufacturer-recommended replacement, offering the highest inventory availability (6300 pcs) and includes REACH Unaffected status documentation. This part carries expanded regulatory approvals including CQC, CSA, TUV, and UL certifications.

RXEF025-AP provides an alternative with equivalent electrical and mechanical specifications, supported by CQC, CSA, TUV, and UL approvals, with moderate inventory availability (1443 pcs).

Both parts are supplied in Cut Tape packaging and maintain full compatibility with the original 72R025XPR circuit requirements. Dimensional variations in thickness (0.122" vs 0.118") and lead spacing (0.201" vs 0.199") are within acceptable mechanical tolerances for through-hole radial mounting applications.

Frequently Asked Questions (FAQ)

Q: Can RXEF025-AP and RXEF025-2 be used interchangeably with 72R025XPR?

A: Yes. Both substitute parts meet all electrical specifications (72V, 250 mA hold current, 500 mA trip current, 2.5 s trip time) and mechanical requirements (through-hole radial disc package) of the obsolete 72R025XPR. Minor dimensional differences in thickness and lead spacing are within acceptable tolerances for PCB mounting.

Q: What is the primary reason for substituting 72R025XPR?

A: The 72R025XPR is classified as obsolete. RXEF025-AP and RXEF025-2 are active products from the same manufacturer with identical functional parameters, ensuring long-term availability and supply chain continuity.

Q: Are there compliance differences between the substitute parts?

A: Both RXEF025-AP and RXEF025-2 are ROHS3 compliant. RXEF025-2 includes additional REACH Unaffected status. Both carry expanded regulatory approvals (CQC, CSA, TUV, UL) compared to the original part (cURus, TUV).

Q: What packaging formats are available for the substitute parts?

A: Both RXEF025-AP and RXEF025-2 are supplied in Cut Tape (CT) packaging, suitable for automated assembly processes.

Q: Are the physical dimensions identical between all three parts?

A: The diameter (0.291" / 7.40mm) and height seated (0.500" / 12.70mm) are identical. Thickness varies slightly (0.122" for 72R025XPR vs 0.118" for both substitutes) and lead spacing differs minimally (0.201" vs 0.199"), both within acceptable mechanical tolerances for through-hole applications.