RXE090-2 Equivalent & Substitute Parts

Part Overview

The RXE090-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 72V maximum voltage with 900 mA hold current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The RXE090-2 operates as a thermal protection device in Through Hole Radial, Disc configuration, suitable for applications requiring automatic current limiting and thermal reset capabilities.

Substiute Parts

RXE090-2

Littelfuse Inc.In Stock: 948RXE090-2 Datasheet

Current PartRFQ

RXEF090-2

LittelfuseIn Stock: 2942RXEF090-2 Datasheet

DirectRFQ

RXEF090-AP

LittelfuseIn Stock: 1042RXEF090-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RXE090-2 are determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

• Voltage - Max: 72V
• Current - Hold (Ih) (Max): 900 mA
• Current - Trip (It): 1.8 A
• Current - Max: 40 A
• Time to Trip: 7.2 s
• Resistance - Initial (Ri) (Min): 200 mOhms
• Resistance - Post Trip (R1) (Max): 470 mOhms

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Size / Dimension: 0.441" Dia x 0.118" T (11.20mm x 3.00mm)
• Lead Spacing: 0.199" (5.05mm)

The identified substitutes RXEF090-2 and RXEF090-AP meet all electrical and mechanical requirements for direct replacement of the obsolete RXE090-2.

Parameter Comparison

Engineering Selection Recommendations

Both RXEF090-2 and RXEF090-AP are active production parts that provide complete electrical and mechanical equivalence to the obsolete RXE090-2. Selection between these two substitutes should be based on the following factors:

RXEF090-2: This part carries Active product status with ROHS3 compliance and expanded approval certifications including CQC. It is available in Cut Tape packaging with 2854 units in stock, providing the highest inventory availability.

RXEF090-AP: This part also carries Active product status with ROHS3 compliance and equivalent approval certifications. It is available in Cut Tape packaging with 986 units in stock.

Both substitutes provide identical electrical performance and mechanical compatibility with the RXE090-2. The choice between them depends on packaging requirements, inventory availability, and supply chain considerations. Both parts meet current regulatory compliance standards, whereas the original RXE090-2 is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can RXEF090-2 or RXEF090-AP be used as direct replacements for RXE090-2?

A: Yes. Both RXEF090-2 and RXEF090-AP meet all electrical and mechanical specifications of the RXE090-2, including voltage rating, current ratings, resistance characteristics, and physical dimensions. They are pin-compatible and functionally equivalent.

Q: What is the difference between RXEF090-2 and RXEF090-AP?

A: Both parts are electrically and mechanically identical. The primary differences are product series designation (RXEF vs. RXEF) and inventory availability. Both are Active status parts with ROHS3 compliance.

Q: Why is the RXE090-2 marked as obsolete?

A: The RXE090-2 has been superseded by the RXEF series. Littelfuse has transitioned production to the RXEF090-2 and RXEF090-AP variants, which offer improved compliance status and expanded certifications.

Q: Are there any compliance differences between the original and substitute parts?

A: Yes. The RXE090-2 is RoHS non-compliant, while both RXEF090-2 and RXEF090-AP are ROHS3 compliant. Both substitutes carry expanded approval certifications including CQC in addition to CSA, TUV, and UL.

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

A: Both RXEF090-2 and RXEF090-AP are supplied in Cut Tape (CT) packaging. The original RXE090-2 was supplied in standard packaging format.

Q: Are the operating temperature ranges specified for all parts?

A: The RXE090-2 does not specify an operating temperature range. Both RXEF090-2 and RXEF090-AP specify -40°C ~ 85°C operating temperature range.