MICROASMDCH075F-2 Equivalent & Substitute Parts

Part Overview

The MICROASMDCH075F-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® microASMD series. This surface mount component provides overcurrent protection in a compact 1210 (3225 Metric) package with a concave profile. The device is rated for 16V maximum voltage with a 750 mA hold current and 2.25 A trip current, designed for applications requiring automatic resettable protection without component replacement. The part maintains Active product status and carries AEC-Q200 automotive qualification, making it suitable for demanding industrial and automotive environments.

Equivalent and substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and regulatory certifications to ensure direct interchangeability in circuit designs.

Substiute Parts

MICROASMDCH075F-2

Littelfuse Inc.In Stock: 4770MICROASMDCH075F-2 Datasheet

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MICROASMDCH075F-2

Littelfuse Inc.In Stock: 4770MICROASMDCH075F-2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MICROASMDCH075F-2 is determined by strict equivalence across the following critical parameters:

Electrical Performance Parameters:

• Voltage rating: 16V maximum
• Hold current (Ih): 750 mA maximum
• Trip current (It): 2.25 A
• Maximum current: 20 A
• Time to trip: 100 ms
• Initial resistance (Ri): 100 mOhms minimum
• Post-trip resistance (R1): 680 mOhms maximum

Mechanical Compatibility Parameters:

• Package type: 1210 (3225 Metric), Concave profile
• Mounting type: Surface Mount
• Physical dimensions: 0.127" L x 0.101" W (3.22mm x 2.58mm)
• Maximum thickness: 0.024" (0.60mm)

Regulatory and Compliance Parameters:

• Product type: Polymeric PTC Resettable Fuse
• Series: PolySwitch® microASMD
• Ratings: AEC-Q200
• Approval agencies: TUV, UR
• Product status: Active

Parts qualify as direct substitutes only when all parameters match exactly within the specified tolerances and ranges.

Parameter Comparison

Engineering Selection Recommendations

The MICROASMDCH075F-2 is the sole equivalent part identified for this application. The substitute part listed is identical to the main part across all electrical, mechanical, and regulatory parameters.

Compliance Basis: The part carries AEC-Q200 qualification, indicating suitability for automotive applications with stringent reliability requirements. Approval by both TUV and UR agencies confirms compliance with international safety standards for polymeric PTC resettable fuses.

Product Status: Both the main part and substitute maintain Active product status, ensuring continued availability and manufacturing support from Littelfuse Inc.

Application Compatibility: The 1210 (3225 Metric) surface mount package with concave profile is optimized for high-density PCB layouts. The 750 mA hold current and 2.25 A trip current parameters are fixed design specifications that determine circuit protection characteristics. Any deviation from these parameters results in incompatibility with the original circuit design.

Thermal Performance: The operating temperature range of -40°C to 85°C accommodates both industrial and automotive environments. The 100 ms time-to-trip specification ensures rapid response to overcurrent conditions.

Frequently Asked Questions (FAQ)

Q: Can the MICROASMDCH075F-2 be substituted with a different Littelfuse PolySwitch® model?

A: No. Substitution is limited to parts with identical electrical parameters (16V, 750 mA Ih, 2.25 A It), mechanical package (1210 Concave), and regulatory certifications (AEC-Q200, TUV, UR). Different PolySwitch® models within the microASMD series may have different current ratings or voltage specifications and are not interchangeable.

Q: What is the significance of the 1210 (3225 Metric) Concave package specification?

A: The package designation specifies both the physical footprint (1210 in imperial units, 3225 in metric units) and the profile type (Concave). The concave profile affects PCB pad design and solder joint formation. Substitutes must match this exact package specification to ensure proper mounting and electrical contact.

Q: Does the AEC-Q200 rating apply to all applications?

A: AEC-Q200 qualification indicates the part meets automotive-grade reliability standards. While this certification is valuable for automotive applications, the part is suitable for any application requiring polymeric PTC resettable fuse protection within the specified electrical and thermal parameters.

Q: What is the Moisture Sensitivity Level (MSL) 2A rating?

A: MSL 2A indicates the component can be stored in standard conditions for up to 4 weeks before soldering. This affects handling and storage procedures but does not impact electrical performance or substitution eligibility.

Q: Are there any package footprint differences between equivalent parts?

A: No. All equivalent parts share identical dimensions: 0.127" L x 0.101" W (3.22mm x 2.58mm) with a maximum thickness of 0.024" (0.60mm). PCB footprints and land patterns are identical.

Q: Can this part be used in applications exceeding 16V?

A: No. The 16V maximum voltage rating is a fixed design parameter. Use in higher voltage applications violates the component specification and may result in device failure or safety hazards.

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

A: Hold current (Ih) of 750 mA is the maximum continuous current the device passes without tripping. Trip current (It) of 2.25 A is the threshold at which the device activates protection. Currents between these values trigger the device within the 100 ms time-to-trip specification.