Equivalent & Substitute Parts for RLD30P110UFF

Part Overview

The RLD30P110UFF 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 1.1A hold current and 2.2A trip current, designed for through-hole radial mounting in disc configuration. The product is currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and design continuity in applications requiring polymeric PTC resettable fuse protection.

Substiute Parts

RLD30P110UFF

Littelfuse Inc.In Stock: 821RLD30P110UFF Datasheet

Current PartRFQ

RUEF110

LittelfuseIn Stock: 3387RUEF110 Datasheet

MFR RecommendedRFQ

30R110UPR

Littelfuse Inc.In Stock: 320930R110UPR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the RLD30P110UFF are identified based on strict electrical and mechanical parameter alignment. The critical substitution criteria are:

• Maximum voltage rating of 30V
• Hold current (Ih) of 1.1A
• Trip current (It) of 2.2A
• Time to trip of 6.6 seconds
• Post-trip resistance (R1) maximum of 170 mOhms
• Through-hole radial disc mounting configuration
• Physical dimensions compatible with 0.291" L x 0.118" W footprint
• Lead spacing within acceptable tolerance of 0.201" (5.10mm)
• Operating temperature range of -40°C to 85°C

Two substitute parts meet these criteria: RUEF110 (PolySwitch® series, Active status) and 30R110UPR (POLY-FUSE® 30R series, Active status). Both maintain identical electrical performance specifications and physical form factors suitable for direct replacement in applications originally designed for RLD30P110UFF.

Parameter Comparison

Engineering Selection Recommendations

Both RUEF110 and 30R110UPR are active production components suitable for replacing the obsolete RLD30P110UFF. Selection between these two substitutes depends on application-specific requirements:

RUEF110 is recommended for applications requiring broader regulatory compliance. This component carries certifications from CQC, CSA, TUV, and UL, providing expanded approval coverage compared to the original part. The RUEF110 also features a higher maximum current rating of 100A, offering additional margin in applications with transient current conditions. Initial resistance is specified at 70 mOhms minimum, which is slightly higher than the original 50 mOhms specification.

30R110UPR maintains identical electrical and mechanical specifications to the original RLD30P110UFF, including the 50 mOhms minimum initial resistance and 40A maximum current rating. This component is packaged in cut tape format and carries the same cURus and TUV certifications as the original part. The 30R110UPR provides direct parametric equivalence for applications where exact specification matching is required.

Both substitutes are ROHS3 compliant and operate across the full -40°C to 85°C temperature range. Lead spacing differences (0.199" for RUEF110 versus 0.201" for 30R110UPR) are within acceptable PCB layout tolerances for through-hole radial components.

Frequently Asked Questions (FAQ)

Q: Can RUEF110 and 30R110UPR be used interchangeably with RLD30P110UFF?

A: Both components meet the electrical and mechanical substitution criteria for RLD30P110UFF. RUEF110 and 30R110UPR share identical hold current (1.1A), trip current (2.2A), voltage rating (30V), and time-to-trip (6.6s) specifications. Physical dimensions and lead spacing are compatible with original PCB layouts. Selection depends on regulatory certification requirements and current margin needs for your specific application.

Q: What is the difference in initial resistance between these parts?

A: RLD30P110UFF and 30R110UPR specify 50 mOhms minimum initial resistance. RUEF110 specifies 70 mOhms minimum initial resistance. All three components maintain identical post-trip resistance maximum of 170 mOhms. The initial resistance difference in RUEF110 may result in slightly higher steady-state voltage drop during normal operation.

Q: Are there packaging differences between the substitutes?

A: RLD30P110UFF was supplied in standard packaging (status: obsolete). RUEF110 is supplied in bag packaging. 30R110UPR is supplied in cut tape format. Packaging format does not affect component electrical performance or PCB mounting compatibility.

Q: Which substitute has the broadest regulatory approval?

A: RUEF110 carries certifications from CQC, CSA, TUV, and UL. RLD30P110UFF and 30R110UPR carry certifications from cURus and TUV. RUEF110 provides expanded regulatory coverage for applications requiring multiple regional compliance standards.

Q: What is the maximum current rating difference?

A: RLD30P110UFF and 30R110UPR are rated for 40A maximum current. RUEF110 is rated for 100A maximum current. All three components trip at identical 2.2A trip current. The higher maximum current rating in RUEF110 provides additional transient current handling capability without affecting trip threshold performance.

Q: Are all three components RoHS compliant?

A: Yes. RLD30P110UFF, RUEF110, and 30R110UPR are all ROHS3 compliant. All components are suitable for applications requiring RoHS compliance.