RLD30P900UFF Equivalent & Substitute Parts

Part Overview

The RLD30P900UFF is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., part of the POLY-FUSE® RLD30 series. This component is rated for 30V maximum voltage with a 9A hold current and is designed for through-hole radial mounting in disc configuration. The RLD30P900UFF is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing system support and component procurement.

Substiute Parts

RLD30P900UFF

Littelfuse Inc.In Stock: 1172RLD30P900UFF Datasheet

Current PartRFQ

30R900UH

Littelfuse Inc.In Stock: 369930R900UH Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 30R900UH qualifies as a direct substitute for the RLD30P900UFF based on the following critical parameters:

• Identical voltage rating: 30V maximum
• Identical hold current: 9A
• Identical trip current: 18A
• Identical maximum current: 40A
• Identical time to trip: 20 seconds
• Identical initial resistance: 5 mOhms minimum
• Identical post-trip resistance: 20 mOhms maximum
• Identical operating temperature range: -40°C to 85°C
• Identical mounting type: Through Hole
• Identical package configuration: Radial, Disc
• Identical regulatory certifications: cURus, TUV
• Identical RoHS compliance: ROHS3 Compliant

The 30R900UH is manufactured by the same supplier (Littelfuse Inc.) and maintains all electrical and mechanical specifications required for direct substitution. The primary distinction is product status: the RLD30P900UFF is obsolete while the 30R900UH is active, with significantly higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The 30R900UH is the appropriate substitute for the obsolete RLD30P900UFF. Both components carry identical regulatory certifications (cURus, TUV) and maintain ROHS3 compliance, ensuring compatibility with current environmental and safety standards. The 30R900UH's active product status provides assured long-term availability and supply chain continuity compared to the obsolete RLD30P900UFF. All electrical parameters, thermal specifications, and mechanical dimensions are equivalent, supporting direct board-level substitution without circuit redesign or validation modifications.

Frequently Asked Questions (FAQ)

Q: Can the 30R900UH be used as a direct replacement for the RLD30P900UFF?

A: Yes. The 30R900UH is a direct substitute. All critical electrical parameters (voltage, hold current, trip current, resistance values) and mechanical specifications (mounting type, package configuration, lead spacing) are identical. Both components are manufactured by Littelfuse Inc. and carry the same regulatory certifications.

Q: What is the primary reason to transition from RLD30P900UFF to 30R900UH?

A: The RLD30P900UFF is obsolete, while the 30R900UH is an active product with higher inventory availability. Transitioning to the 30R900UH ensures continued component procurement and supply chain reliability.

Q: Are there any dimensional differences between these parts?

A: The components share identical lead spacing (0.402" / 10.20mm) and package configuration (Radial, Disc). Minor variations exist in seated height (RLD30P900UFF: 1.169" vs. 30R900UH: 1.244"), which do not affect through-hole mounting compatibility or circuit board layout.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the RLD30P900UFF and 30R900UH are certified by cURus and TUV, and both comply with ROHS3 requirements.

Q: What is the operating temperature range for these components?

A: Both components operate across the identical temperature range of -40°C to 85°C, supporting use in standard industrial and commercial applications.