RXEF090-AP Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The RXEF090-AP is a polymeric PTC resettable fuse manufactured by Littelfuse, designed for circuit protection in applications requiring 72V maximum voltage and 900 mA hold current. This component is classified as active product status and is widely used in industrial and consumer electronics for overcurrent protection with automatic recovery capability. Substitute parts are identified to provide alternative sourcing options while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

RXEF090-AP

LittelfuseIn Stock: 1042RXEF090-AP Datasheet

Current PartRFQ

72R090XPR

Littelfuse Inc.In Stock: 356372R090XPR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RXEF090-AP are identified based on strict equivalence across the following critical parameters:

• Voltage rating: 72V maximum
• Hold current (Ih): 900 mA maximum
• Trip current (It): 1.8 A
• Maximum current: 40 A
• Time to trip: 7.2 s
• Initial resistance (Ri): 200 mOhms minimum
• Post-trip resistance (R1): 470 mOhms maximum
• Operating temperature range: -40°C ~ 85°C
• Mounting configuration: Through Hole Radial, Disc package
• RoHS compliance: ROHS3 Compliant

The 72R090XPR meets all these criteria and is therefore classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both RXEF090-AP and 72R090XPR are active products manufactured by Littelfuse with identical electrical performance specifications. The 72R090XPR carries cURus and TUV certifications, while the RXEF090-AP includes CQC, CSA, TUV, and UL certifications. Selection between these parts should be based on specific application certification requirements. Both components are ROHS3 compliant and suitable for equivalent circuit protection applications within the specified voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the 72R090XPR directly replace the RXEF090-AP in existing designs?

A: Yes. Both parts share identical electrical specifications including 72V maximum voltage, 900 mA hold current, 1.8 A trip current, and 7.2 s time to trip. Physical dimensions are nearly identical with only minor thickness variation (0.118" vs 0.122") and lead spacing difference (0.199" vs 0.201"), which remain within standard PCB tolerance ranges for through-hole radial components.

Q: Are there any certification differences between these parts?

A: The RXEF090-AP includes CQC, CSA, TUV, and UL approvals. The 72R090XPR includes cURus and TUV approvals. Application-specific certification requirements should determine part selection.

Q: What is the significance of the lead spacing difference?

A: Lead spacing differs by 0.002" (0.05mm), which is negligible for standard PCB through-hole designs. Both parts are compatible with typical 5mm pitch footprints used for radial disc fuses.

Q: Do both parts have identical thermal performance?

A: Yes. Both components operate across the same temperature range of -40°C to 85°C with identical time-to-trip characteristics of 7.2 seconds.

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

A: Yes. Both RXEF090-AP and 72R090XPR are supplied in Cut Tape (CT) packaging and feature identical through-hole radial disc package configurations.