RF5053-000 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RF5053-000 is an active polymeric PTC (Positive Temperature Coefficient) resettable fuse manufactured by Littelfuse Inc. under the PolySwitch® picoASMDC series. This component functions as an electronic overcurrent protection device with automatic reset capability, designed for surface mount applications in 0805 (2012 Metric) package format.

Polymeric PTC resettable fuses are essential in circuit protection applications where automatic recovery after fault conditions is required. The RF5053-000 operates at 6V maximum with a 500 mA hold current rating and provides protection up to 100 A maximum current. Finding equivalent substitute parts is necessary to ensure design flexibility, supply chain continuity, and component availability across manufacturing cycles.

Substiute Parts

RF5053-000

Littelfuse Inc.In Stock: 1182RF5053-000 Datasheet

Current PartRFQ

PICOASMDC050S-2

Littelfuse Inc.In Stock: 3924PICOASMDC050S-2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RF5053-000 are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must match exactly:

Electrical Parameters (Must Match):

• Voltage - Maximum: 6V
• Current - Hold (Ih) Maximum: 500 mA
• Current - Trip (It): 1 A
• Current - Maximum: 100 A
• Time to Trip: 100 ms
• Resistance - Initial (Ri) Minimum: 150 mOhms
• Resistance - Post Trip (R1) Maximum: 800 mOhms
• Operating Temperature Range: -40°C to 85°C

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Package / Case: 0805 (2012 Metric), Concave
• Physical Dimensions: 0.083" L x 0.055" W (2.10mm x 1.40mm)
• Thickness Maximum: 0.037" (0.93mm)
• Packaging Format: Tape & Reel (TR)

Compliance (Must Match):

• Product Type: Polymeric PTC Resettable Fuse
• Series: PolySwitch® picoASMDC
• Product Status: Active
• Compliance Rating: AEC-Q200

Only components meeting all specified parameters are classified as direct parametric equivalents.

Parameter Comparison

Engineering Selection Recommendations

The PICOASMDC050S-2 is a direct parametric equivalent to the RF5053-000. Both components are manufactured by Littelfuse Inc., belong to the PolySwitch® picoASMDC series, and maintain identical electrical and mechanical specifications across all critical parameters.

Both parts carry Active product status and AEC-Q200 compliance certification, confirming suitability for automotive and industrial applications requiring qualified component standards. The parametric alignment across voltage rating, current characteristics, thermal performance, and package geometry ensures functional interchangeability in circuit protection applications.

Component selection between RF5053-000 and PICOASMDC050S-2 may be determined by inventory availability, supply chain logistics, or procurement requirements, as both parts are functionally equivalent for the specified application.

Frequently Asked Questions (FAQ)

Q: Can PICOASMDC050S-2 be used as a direct replacement for RF5053-000?

A: Yes. Both components are parametric equivalents with identical electrical ratings (6V, 500 mA hold current, 1 A trip current), identical thermal characteristics (-40°C to 85°C operating range), and identical mechanical specifications (0805 package, 2.10mm x 1.40mm dimensions). Both carry AEC-Q200 certification and Active product status.

Q: Are there any differences in package or mounting between these parts?

A: No. Both RF5053-000 and PICOASMDC050S-2 use identical 0805 (2012 Metric) concave surface mount packages with matching physical dimensions (0.083" L x 0.055" W, 0.037" maximum thickness) and are supplied in Tape & Reel format.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution eligibility is determined by exact matching of: maximum voltage (6V), hold current (500 mA), trip current (1 A), maximum current (100 A), time to trip (100 ms), initial resistance (150 mOhms minimum), post-trip resistance (800 mOhms maximum), operating temperature range (-40°C to 85°C), package type (0805 concave), and compliance rating (AEC-Q200).

Q: Do both parts have the same compliance certifications?

A: Yes. Both RF5053-000 and PICOASMDC050S-2 carry AEC-Q200 certification, confirming qualification for automotive-grade applications and industrial environments requiring standardized component reliability.

Q: What is the difference between hold current and trip current?

A: Hold current (Ih) is the maximum continuous current the fuse conducts without tripping (500 mA for this component). Trip current (It) is the threshold at which the fuse activates its protective mechanism (1 A for this component). Currents exceeding the trip threshold cause the fuse to transition to high-resistance state within the specified time to trip (100 ms).