PICOSMD035F-2 Equivalent & Substitute Parts

Part Overview

The PICOSMD035F-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 6V at 350 mA hold current in a surface mount 0805 (2012 Metric) package. This component is classified as Obsolete, necessitating identification of active equivalent parts for ongoing design and procurement requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal characteristics while meeting the same mechanical and compliance standards.

Substiute Parts

PICOSMD035F-2

Littelfuse Inc.In Stock: 715PICOSMD035F-2 Datasheet

Current PartRFQ

0805L035YR

Littelfuse Inc.In Stock: 125760805L035YR Datasheet

DirectRFQ

PICOSMDC035S-2

Littelfuse Inc.In Stock: 12407PICOSMDC035S-2 Datasheet

DirectRFQ

0ZCK0035FF2G

Bel Fuse Inc.In Stock: 1670410ZCK0035FF2G Datasheet

DirectRFQ

MF-PSMF035X-2

Bourns Inc.In Stock: 81145MF-PSMF035X-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PICOSMD035F-2 is determined by the following critical parameters:

• Voltage Rating (6V): All substitute parts must maintain the maximum voltage specification of 6V
• Current - Hold (350 mA): The hold current must not exceed 350 mA to ensure circuit protection at the design threshold
• Current - Trip (750 mA): Trip current specification must match at 750 mA for consistent fault response
• Package Type (0805 / 2012 Metric): Physical form factor must be 0805 surface mount to ensure PCB compatibility
• Operating Temperature Range (-40°C ~ 85°C): Thermal operating window must encompass the specified range
• Polymeric Type: All substitutes must be polymeric PTC resettable fuses, not ceramic or other technologies
• RoHS3 Compliance: Environmental and hazardous substance restrictions must be met

Four active substitute parts meet these criteria: 0805L035YR (Littelfuse), PICOSMDC035S-2 (Littelfuse), 0ZCK0035FF2G (Bel Fuse), and MF-PSMF035X-2 (Bourns).

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts satisfy the core electrical and mechanical requirements for direct replacement of the PICOSMD035F-2. Selection should be based on the following factors:

Littelfuse PolySwitch® Series (PICOSMDC035S-2): Maintains the original manufacturer lineage with CSA, TUV, and UL certifications. Time to trip specification is 200 ms, which differs from the original 100 ms. This part is suitable for applications where extended response time is acceptable.

Littelfuse POLY-FUSE® Series (0805L035YR): Active product with cURus and TUV certifications. Offers 100 ms trip time matching the original specification. Initial resistance is lower at 250 mOhms compared to the original 420 mOhms, resulting in reduced voltage drop during normal operation.

Bel Fuse 0ZCK Series (0ZCK0035FF2G): Active product with AEC-Q200 automotive qualification and cURus, TUV certifications. Moisture sensitivity level is 2A (4 weeks), requiring controlled storage conditions compared to the unlimited MSL of other options. Electrical characteristics match 0805L035YR.

Bourns Multifuse® Series (MF-PSMF035X-2): Active product with cURus and TUV certifications. Maximum current rating of 40 A is lower than other substitutes. Initial resistance and post-trip resistance specifications match 0805L035YR.

For applications requiring UL certification, PICOSMDC035S-2 is the preferred substitute. For automotive applications, 0ZCK0035FF2G provides AEC-Q200 qualification. For general industrial use with standard certifications, 0805L035YR or MF-PSMF035X-2 are suitable alternatives.

Frequently Asked Questions (FAQ)

Q: Can PICOSMDC035S-2 be used as a direct replacement for PICOSMD035F-2?

A: Yes. Both parts share identical voltage (6V), hold current (350 mA), and trip current (750 mA) specifications. The primary difference is time to trip: PICOSMDC035S-2 specifies 200 ms versus 100 ms for the original. This difference is acceptable in applications where the extended response time does not compromise circuit protection requirements.

Q: What is the significance of the concave package designation on substitute parts?

A: The concave package geometry is a physical feature of the substitute parts that does not affect electrical performance. PCB footprints designed for standard 0805 packages will accommodate concave variants without modification, as the electrical contact points and overall dimensions remain compatible.

Q: Why does 0ZCK0035FF2G have MSL 2A instead of MSL 1?

A: Moisture Sensitivity Level 2A requires storage at controlled humidity (≤60% RH) for up to 4 weeks before soldering. This is a manufacturing and handling consideration, not an electrical performance factor. Applications with standard moisture control procedures will not be affected.

Q: Are all substitute parts suitable for the same circuit applications?

A: All substitutes meet the core electrical specifications (6V, 350 mA hold, 750 mA trip). Selection should account for certification requirements (UL, automotive AEC-Q200), time to trip tolerance, and storage conditions. Consult application-specific standards for certification mandates.

Q: What is the difference between initial resistance (Ri) values across substitutes?

A: Initial resistance ranges from 250 mOhms to 420 mOhms. Lower initial resistance reduces voltage drop during normal circuit operation, improving efficiency. Higher initial resistance increases voltage drop but may be required for specific circuit designs. Verify compatibility with circuit voltage budgets.