RF5052-000 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RF5052-000 is a Polymeric PTC (Positive Temperature Coefficient) resettable fuse manufactured by Littelfuse Inc. under the PolySwitch® picoASMDC series. This component functions as an automatic electrical protection device that interrupts circuit current when thermal conditions exceed design thresholds, then automatically resets when the fault condition is cleared. The part is rated for 6V maximum voltage with a 350 mA hold current and is packaged in a 0805 (2012 Metric) surface mount configuration with concave geometry.

The RF5052-000 maintains Active product status with AEC-Q200 automotive-grade qualification. Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain performance consistency across manufacturing batches and procurement cycles.

Substiute Parts

RF5052-000

Littelfuse Inc.In Stock: 1231RF5052-000 Datasheet

Current PartRFQ

PICOASMDC035S-2

Littelfuse Inc.In Stock: 4960PICOASMDC035S-2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RF5052-000 is determined by strict equivalence across electrical and mechanical parameters. The substitute part must satisfy all of the following criteria:

Electrical Parameters (Non-Negotiable):

• Voltage rating: 6V maximum
• Hold current (Ih): 350 mA maximum
• Trip current (It): 750 mA
• Time to trip: 200 ms
• Initial resistance (Ri): 350 mOhms minimum
• Post-trip resistance (R1): 1.4 Ohms maximum
• Operating temperature range: -40°C to 85°C

Mechanical Parameters (Non-Negotiable):

• Package type: 0805 (2012 Metric), Concave
• Mounting type: Surface Mount
• Maximum thickness: 0.027 inches (0.68 mm)

Compliance & Certification:

• Product type: Polymeric PTC resettable fuse
• Series: PolySwitch® picoASMDC
• Ratings: AEC-Q200 automotive qualification

Parts that match all electrical, mechanical, and compliance parameters are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The PICOASMDC035S-2 is a direct parametric equivalent to the RF5052-000. Both parts are manufactured by Littelfuse Inc., belong to the PolySwitch® picoASMDC series, and share identical electrical specifications, mechanical dimensions, and compliance certifications.

Selection Basis:

1. Electrical Equivalence: All voltage, current, resistance, and thermal response parameters are identical. The parts are functionally interchangeable in circuit protection applications requiring 6V, 350 mA hold current specifications.

2. Mechanical Compatibility: Both parts use the 0805 (2012 Metric) concave surface mount package with identical thickness specifications. PCB footprints and reflow soldering profiles are compatible.

3. Compliance & Certification: Both parts carry AEC-Q200 automotive-grade qualification, ensuring suitability for automotive and industrial applications requiring automotive-level reliability standards.

4. Product Status: Both parts maintain Active status, indicating current manufacturing availability and ongoing manufacturer support.

5. Supply Chain Continuity: The substitute part is available in higher inventory (4923 Pcs vs. 1166 Pcs), providing supply chain flexibility and procurement options.

Selection between RF5052-000 and PICOASMDC035S-2 may be based on inventory availability, lead time, packaging preferences, or procurement source requirements. No electrical or mechanical redesign is required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Are RF5052-000 and PICOASMDC035S-2 electrically identical?

A: Yes. Both parts have identical voltage ratings (6V maximum), hold current (350 mA), trip current (750 mA), time to trip (200 ms), initial resistance (350 mOhms minimum), and post-trip resistance (1.4 Ohms maximum). They are direct electrical equivalents.

Q: Can I substitute PICOASMDC035S-2 for RF5052-000 without PCB redesign?

A: Yes. Both parts use the 0805 (2012 Metric) concave surface mount package with identical dimensions and thickness specifications. No PCB footprint or layout changes are required.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both RF5052-000 and PICOASMDC035S-2 carry AEC-Q200 automotive-grade ratings, qualifying them for automotive and industrial applications requiring automotive-level reliability standards.

Q: What is the operating temperature range for both parts?

A: Both parts operate across the temperature range of -40°C to 85°C, ensuring consistent performance across standard industrial and automotive environmental conditions.

Q: Are there any differences in packaging or delivery format?

A: Both parts are supplied in Tape & Reel (TR) packaging format, standard for surface mount component automation and high-volume assembly processes.

Q: What is the difference between hold current (Ih) and trip current (It)?

A: Hold current (Ih) is the maximum continuous current the fuse allows without tripping, rated at 350 mA. Trip current (It) is the threshold at which the fuse activates thermal protection, set at 750 mA. Both parameters are identical across both parts.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The RF5052-000 and PICOASMDC035S-2 are parametric equivalents with identical electrical and mechanical specifications. Direct substitution is supported without circuit or layout modifications.