RLD30P700UFF Equivalent & Substitute Parts

Part Overview

The RLD30P700UFF is a Polymeric PTC Resettable Fuse manufactured by Littelfuse, part of the POLY-FUSE® RLD30 series. This through-hole radial disc component is rated for 30V maximum voltage with a 7A hold current. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support, maintenance, and new design implementations where this specification remains applicable.

Substiute Parts

RLD30P700UFF

LittelfuseIn Stock: 711RLD30P700UFF Datasheet

Current PartRFQ

30R800UH

Littelfuse Inc.In Stock: 297130R800UH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RLD30P700UFF is determined by strict electrical and mechanical compatibility within the Littelfuse POLY-FUSE® product family. The following parameters establish the substitution criteria:

Electrical Compatibility Requirements:

• Maximum voltage rating must equal or exceed 30V
• Mounting type must remain Through Hole with Radial, Disc configuration
• Lead spacing must match 0.402" (10.20mm) to ensure PCB compatibility
• Approval agencies (cURus, TUV) and RoHS3 compliance must be maintained

Functional Compatibility:

• Hold current (Ih) and trip current (It) characteristics must be suitable for the application circuit
• Initial resistance (Ri) and post-trip resistance (R1) must fall within acceptable operating parameters
• Operating temperature range must support the intended environment

The 30R800UH meets all substitution criteria as an active product within the same POLY-FUSE® family, offering enhanced availability and current product status.

Parameter Comparison

Engineering Selection Recommendations

The 30R800UH is the designated manufacturer-recommended substitute for the obsolete RLD30P700UFF. Both components maintain identical voltage ratings, operating temperature ranges, and mechanical compatibility through matching lead spacing and radial disc package configuration. Both components carry cURus and TUV approvals with ROHS3 compliance, ensuring regulatory and safety standard continuity.

The 30R800UH is an active product with current manufacturing status and documented inventory availability, eliminating supply chain risk associated with the obsolete RLD30P700UFF. The electrical parameter differences—specifically the higher hold current (8A vs. 7A) and higher trip current (16A vs. 14A)—position the 30R800UH as a functionally compatible alternative for circuits designed around the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 30R800UH directly replace the RLD30P700UFF in existing designs?

A: Yes. Both components share identical voltage ratings (30V), operating temperature ranges (-40°C to 85°C), lead spacing (0.402"), and radial disc package configuration. PCB layout and mounting requirements remain unchanged. The higher hold and trip current ratings of the 30R800UH do not compromise compatibility in applications designed for the RLD30P700UFF.

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

A: The 30R800UH has a higher hold current (8A vs. 7A) and higher trip current (16A vs. 14A). The post-trip resistance is lower (20 mOhms vs. 30 mOhms). These differences reflect design improvements in the active 30R series while maintaining the same maximum voltage and current ratings.

Q: Are both components certified to the same standards?

A: Yes. Both the RLD30P700UFF and 30R800UH carry cURus and TUV approvals and are ROHS3 compliant, ensuring equivalent regulatory and safety certification status.

Q: Why is the RLD30P700UFF obsolete?

A: The RLD30P700UFF has been superseded by the 30R800UH within the Littelfuse POLY-FUSE® product portfolio. The 30R series represents the current active product line for this voltage and current class.

Q: Does lead spacing remain the same for PCB compatibility?

A: Yes. Both components have identical lead spacing of 0.402" (10.20mm), ensuring direct PCB compatibility without layout modifications.