72R030XPR Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The 72R030XPR is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. under the POLY-FUSE® 72R series. This through-hole radial disc component provides overcurrent protection at 72V with a 300 mA hold current rating. The device is actively produced and widely stocked, with 2,439 units available in inventory. Substitute parts may be required due to supply chain constraints, regional availability differences, or specific certification requirements for particular applications.

Substiute Parts

72R030XPR

Littelfuse Inc.In Stock: 246172R030XPR Datasheet

Current PartRFQ

RXEF030-AP

LittelfuseIn Stock: 43406RXEF030-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 72R030XPR has one direct equivalent substitute: RXEF030-AP, manufactured by Littelfuse. Substitution eligibility is determined by the following critical parameters:

• Voltage rating: 72V maximum
• Hold current (Ih): 300 mA maximum
• Trip current (It): 600 mA
• Time to trip: 3 seconds
• Initial resistance: 880 mOhms minimum
• Post-trip resistance: 2.1 Ohms maximum
• Operating temperature: -40°C to 85°C
• Mounting configuration: Through-hole radial disc
• RoHS3 compliance and MSL Level 1 rating

Both parts meet these criteria identically, making RXEF030-AP a direct functional equivalent for 72R030XPR in applications requiring polymeric PTC resettable fuse protection.

Parameter Comparison

Engineering Selection Recommendations

Both 72R030XPR and RXEF030-AP are active production components from Littelfuse with identical electrical and thermal specifications. Selection between these parts should be based on:

Certification Requirements: RXEF030-AP carries additional approvals (CQC, CSA, UL) beyond the cURus and TUV certifications of 72R030XPR. Applications requiring CSA, UL, or CQC compliance must use RXEF030-AP.

Inventory Availability: RXEF030-AP has significantly higher stock levels (43,300 units) compared to 72R030XPR (2,439 units), making it preferable for high-volume procurement or time-sensitive applications.

Physical Dimensions: Minor thickness and lead spacing variations exist (0.122" vs 0.118" thickness; 0.201" vs 0.199" lead spacing). Both dimensions remain within functional equivalence for standard through-hole PCB applications with 5.08mm (0.200") pitch spacing.

Series Designation: 72R030XPR belongs to the POLY-FUSE® 72R series, while RXEF030-AP belongs to the PolySwitch® RXEF series. Both are Littelfuse polymeric PTC technologies with identical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can RXEF030-AP be used as a direct replacement for 72R030XPR?

A: Yes. Both components have identical electrical specifications (72V, 300 mA hold current, 600 mA trip current, 3-second trip time) and identical thermal operating range (-40°C to 85°C). Physical dimensions are functionally equivalent for through-hole radial disc mounting.

Q: What are the key differences between these two parts?

A: The primary differences are series designation (POLY-FUSE® 72R vs PolySwitch® RXEF), approval certifications (RXEF030-AP includes CQC, CSA, and UL in addition to cURus and TUV), and minor physical tolerances in thickness (0.122" vs 0.118") and lead spacing (0.201" vs 0.199").

Q: Which part should I select for a new design?

A: Selection depends on certification requirements. If CSA, UL, or CQC compliance is required, use RXEF030-AP. If only cURus and TUV certifications are needed, either part is acceptable. RXEF030-AP is recommended for high-volume applications due to superior inventory availability.

Q: Are there any PCB layout considerations when switching between these parts?

A: Both parts use through-hole radial disc packaging with 0.500" maximum seated height. Lead spacing differences (0.201" vs 0.199") are negligible for standard 0.200" (5.08mm) pitch PCB layouts. No layout modifications are required for substitution.

Q: Do these parts have the same RoHS and moisture sensitivity ratings?

A: Yes. Both 72R030XPR and RXEF030-AP are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, indicating no special storage or handling requirements.

Q: What is the functional difference between hold current and trip current?

A: Hold current (Ih) is the maximum continuous current the fuse allows without tripping (300 mA for both parts). Trip current (It) is the threshold at which the device activates protection (600 mA for both parts). Both parts trip within 3 seconds when current exceeds the trip threshold.