RHEF900-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RHEF900-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. as part of the PolySwitch® RHEF series. This component is rated for 16V maximum voltage with a 9A hold current and is designed for through-hole radial mounting in disc configuration. The RHEF900-2 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

RHEF900-2

Littelfuse Inc.In Stock: 748RHEF900-2 Datasheet

Current PartRFQ

RHEF900

Littelfuse Inc.In Stock: 812RHEF900 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RHEF900-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 16V maximum
• Current hold specification: 9A
• Current trip specification: 16.5A
• Mounting configuration: Through hole radial disc
• Physical dimensions: 0.650" L x 0.118" W (16.50mm x 3.00mm)
• Lead spacing: 0.199" (5.05mm)
• Polymeric PTC type classification
• Operating temperature range: -40°C ~ 125°C

The RHEF900 (without the "-2" suffix) qualifies as a direct substitute based on identical electrical and mechanical specifications. The primary distinction is product status: RHEF900-2 is obsolete while RHEF900 is active, making RHEF900 the recommended procurement choice for new designs and replacements.

Parameter Comparison

Engineering Selection Recommendations

The RHEF900 is the direct active equivalent for the obsolete RHEF900-2. Both components maintain identical electrical performance specifications, mechanical form factor, and regulatory compliance certifications (CSA, TUV, UL). The RHEF900 carries active product status with current manufacturing support and availability, making it the appropriate selection for component replacement and new circuit implementations requiring 16V/9A polymeric PTC resettable fuse functionality.

Frequently Asked Questions (FAQ)

Q: Can RHEF900 be used as a direct replacement for RHEF900-2 in existing designs?

A: Yes. The RHEF900 is electrically and mechanically identical to RHEF900-2. All electrical parameters, physical dimensions, lead spacing, and mounting configuration are equivalent. The primary difference is product status: RHEF900 is active while RHEF900-2 is obsolete.

Q: What is the significance of the "-2" suffix in RHEF900-2?

A: The "-2" suffix indicates a specific revision or packaging variant of the RHEF900 series. The base part number RHEF900 represents the current active production version with identical electrical and mechanical specifications.

Q: Are there any packaging differences between RHEF900-2 and RHEF900?

A: RHEF900-2 is supplied in standard packaging, while RHEF900 is supplied in bag packaging. Both components are identical in form, fit, and function for circuit applications.

Q: What certifications apply to both parts?

A: Both RHEF900-2 and RHEF900 carry CSA, TUV, and UL approvals. Both are ROHS3 compliant and REACH unaffected.

Q: Are there any thermal or electrical performance differences?

A: No. Both parts operate across the identical temperature range (-40°C ~ 125°C) and maintain the same electrical characteristics: 16V maximum voltage, 9A hold current, 16.5A trip current, and 10-second trip time.