72R020XPR Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The 72R020XPR is a polymeric PTC resettable fuse manufactured by Littelfuse, part of the POLY-FUSE® 72R series. This through-hole radial disc component provides overcurrent protection at 72V with a 200 mA hold current rating. The device is actively produced and widely stocked, with 2670 units available in inventory. Substitute parts may be required due to supply chain constraints, regional availability, or specific certification requirements for end applications.

Substiute Parts

72R020XPR

LittelfuseIn Stock: 270972R020XPR Datasheet

Current PartRFQ

RXEF020-AP

LittelfuseIn Stock: 2042RXEF020-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 72R020XPR is determined by strict equivalence across the following critical parameters:

• Voltage rating: 72V maximum
• Hold current (Ih): 200 mA maximum
• Trip current (It): 400 mA
• Time to trip: 2.2 seconds
• Initial resistance (Ri): 1.83 Ohms minimum
• Post-trip resistance (R1): 4.4 Ohms maximum
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through-hole radial disc
• Regulatory compliance: ROHS3 compliant

The RXEF020-AP from Littelfuse meets all these criteria and qualifies as a direct substitute. Both components are polymeric PTC resettable fuses with identical electrical performance specifications and compatible physical form factors.

Parameter Comparison

Engineering Selection Recommendations

Both the 72R020XPR and RXEF020-AP are active production components from Littelfuse with full ROHS3 compliance and REACH unaffected status. The 72R020XPR carries cURus and TUV certifications, while the RXEF020-AP provides broader certification coverage including CQC, CSA, TUV, and UL approvals. Selection between these parts should be based on specific regional certification requirements or supply availability. The RXEF020-AP offers expanded approval agency coverage, which may be advantageous for applications requiring multiple regulatory certifications. Both components are suitable for direct substitution in 72V, 200 mA hold current protection circuits.

Frequently Asked Questions (FAQ)

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

A: Yes. Both components are electrically and mechanically equivalent. They share identical voltage, current, resistance, and thermal specifications. The through-hole radial disc package and lead spacing are compatible for PCB mounting.

Q: What are the key differences between these parts?

A: The primary differences are the product series designation (POLY-FUSE® 72R versus PolySwitch® RXEF) and approval agency certifications. The RXEF020-AP includes additional certifications (CQC, CSA, UL) beyond the 72R020XPR's cURus and TUV approvals.

Q: Are there physical dimension differences?

A: Minor variations exist in thickness and lead spacing. The 72R020XPR has a thickness of 0.122" (3.10mm) and lead spacing of 0.201" (5.10mm), while the RXEF020-AP measures 0.118" (3.00mm) thickness and 0.199" (5.05mm) lead spacing. These differences are within standard PCB design tolerances for radial disc components.

Q: Which part should I select for new designs?

A: Selection depends on certification requirements. For applications requiring UL or CSA approval, the RXEF020-AP is the appropriate choice. For applications requiring only cURus or TUV certification, either part is suitable. Verify your end-application regulatory requirements before final selection.

Q: Are both parts ROHS3 compliant?

A: Yes. Both 72R020XPR and RXEF020-AP are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level).