MICROASMDCH110F-2 Equivalent & Substitute Parts

Part Overview

The MICROASMDCH110F-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® microASMD series. This surface mount component is designed for overcurrent protection in electronic circuits, featuring a 16V maximum voltage rating and 1.1 A hold current specification. The device is classified as Active product status and carries AEC-Q200 automotive-grade qualification. Polymeric PTC resettable fuses are essential for circuit protection applications where automatic recovery after fault conditions is required, eliminating the need for manual fuse replacement.

Substiute Parts

MICROASMDCH110F-2

Littelfuse Inc.In Stock: 3469MICROASMDCH110F-2 Datasheet

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MICROASMDCH110F-2

Littelfuse Inc.In Stock: 3469MICROASMDCH110F-2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of polymeric PTC resettable fuses is determined by strict electrical and mechanical compatibility criteria. The critical parameters that govern substitution are:

Electrical Parameters:

• Maximum voltage rating must equal or exceed the application requirement (16V)
• Hold current (Ih) must match the circuit's normal operating current specification (1.1 A)
• Trip current (It) must align with the fault detection threshold (3.3 A)
• Initial resistance (Ri) and post-trip resistance (R1) must be compatible with circuit impedance requirements
• Operating temperature range must encompass the application environment (-40°C ~ 85°C)

Mechanical Parameters:

• Package type must be identical: 1210 (3225 Metric), Concave surface mount
• Physical dimensions must match for PCB footprint compatibility
• Mounting type must be surface mount

Compliance Parameters:

• Product status must be Active
• Certifications (AEC-Q200, TUV, UR) must be maintained for automotive and regulated applications
• Moisture sensitivity level must be compatible with assembly and storage requirements

Parameter Comparison

Engineering Selection Recommendations

The MICROASMDCH110F-2 is an Active product with full AEC-Q200 automotive qualification and dual agency approval (TUV, UR). This component is suitable for applications requiring polymeric PTC resettable fuse protection in automotive and industrial environments with operating conditions spanning -40°C to 85°C.

Selection of this part is appropriate for circuits requiring:

• 16V maximum voltage protection
• 1.1 A hold current specification
• 3.3 A trip current threshold
• Automatic recovery capability after fault clearance
• Surface mount assembly on standard PCB layouts
• Compliance with automotive quality standards

The 1210 (3225 Metric) concave package format ensures compatibility with standard surface mount assembly equipment and processes. The MSL 2A rating permits standard handling and storage procedures with a 4-week shelf life window.

Frequently Asked Questions (FAQ)

Q: What is the functional difference between hold current (Ih) and trip current (It) in the MICROASMDCH110F-2?

A: Hold current (Ih) of 1.1 A represents the maximum continuous current the device conducts without activation. Trip current (It) of 3.3 A is the threshold at which the polymeric element transitions to its high-resistance state, interrupting the circuit. The device remains in the tripped state until the fault is cleared and the component cools.

Q: Can the MICROASMDCH110F-2 be substituted with a different package type?

A: No. The 1210 (3225 Metric) concave package is specific to this component's mechanical and electrical design. Substitution requires an identical package type to ensure PCB footprint compatibility and proper thermal characteristics.

Q: What does the 500 ms time to trip specification indicate?

A: Time to trip of 500 ms defines the response time from when the trip current threshold is exceeded until the device reaches its high-resistance state. This parameter is critical for applications requiring specific fault detection timing.

Q: Is the MICROASMDCH110F-2 suitable for automotive applications?

A: Yes. The component carries AEC-Q200 automotive-grade qualification and TUV/UR approvals, making it suitable for automotive circuit protection applications within the specified operating temperature range of -40°C to 85°C.

Q: What is the significance of the 60 mOhms initial resistance specification?

A: Initial resistance (Ri) of 60 mOhms represents the device's normal-state impedance when conducting at rated current. This low resistance minimizes voltage drop across the fuse during normal operation, reducing power dissipation and heat generation in the protected circuit.

Q: How does the post-trip resistance of 500 mOhms function in circuit protection?

A: Post-trip resistance (R1) of 500 mOhms is the high-impedance state the device enters during fault conditions. This elevated resistance effectively interrupts current flow, protecting downstream components. The device returns to its initial low-resistance state once the fault is cleared and the component cools.

Q: What does MSL 2A (4 Weeks) mean for component handling?

A: Moisture Sensitivity Level 2A indicates the component can be exposed to ambient conditions (30°C, 60% relative humidity) for up to 4 weeks without requiring baking before soldering. Extended storage beyond this period requires controlled dry conditions or baking per IPC standards.

Q: Are there any restrictions on the maximum current rating of 20 A?

A: The 20 A maximum current rating represents the absolute maximum current the device can conduct before permanent damage occurs. Normal operation occurs at the 1.1 A hold current specification, with trip activation at 3.3 A. The 20 A rating defines the device's current-handling capability limit.