MINIASMDC075F/33-2 Equivalent & Substitute Parts

Part Overview

The MINIASMDC075F/33-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® miniASMD series. This surface mount component is rated for 33V maximum voltage with a 750 mA hold current and is housed in a 1812 (4532 Metric) package with concave configuration. The part is Active status and ROHS3 compliant, making it suitable for applications requiring automatic overcurrent protection with resettable functionality. Equivalent parts are identified to provide procurement flexibility while maintaining electrical and mechanical compatibility.

Substiute Parts

MINIASMDC075F/33-2

Littelfuse Inc.In Stock: 2644MINIASMDC075F/33-2 Datasheet

Current PartRFQ

PTSA181233V075

Eaton - Electronics DivisionIn Stock: 1708PTSA181233V075 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MINIASMDC075F/33-2 is determined by the following critical parameters:

• Voltage rating of 33V maximum
• Hold current (Ih) of 750 mA maximum
• Surface mount configuration
• 1812 (4532 Metric) package with concave form factor
• Operating temperature range of -40°C to 85°C
• AEC-Q200 automotive qualification

The PTSA181233V075 from Eaton - Electronics Division meets all these core requirements, establishing it as a qualified equivalent part. Both components share identical voltage and hold current specifications, compatible package dimensions, and equivalent thermal operating ranges.

Parameter Comparison

Engineering Selection Recommendations

Both the MINIASMDC075F/33-2 and PTSA181233V075 are Active status components with AEC-Q200 automotive qualification and ROHS3 compliance. Selection between these parts should be based on specific application requirements:

The MINIASMDC075F/33-2 features a longer time-to-trip specification of 1 second, suitable for applications requiring extended response time before protection activation. The PTSA181233V075 provides faster trip response at 300 milliseconds, appropriate for circuits requiring rapid overcurrent detection. Initial resistance differs between the two parts (110 mOhms versus 70 mOhms), which may influence circuit performance in low-impedance applications. The PTSA181233V075 offers superior moisture handling with MSL 1 (Unlimited) compared to MSL 2A (4 Weeks) for the Littelfuse part, providing advantages in humid storage and assembly environments.

Frequently Asked Questions (FAQ)

Q: Can PTSA181233V075 be used as a direct replacement for MINIASMDC075F/33-2?

A: Yes, both parts share identical voltage (33V), hold current (750 mA), package configuration (1812 Concave), and operating temperature range (-40°C to 85°C). Physical dimensions are equivalent, enabling direct PCB placement compatibility.

Q: What are the differences in trip characteristics?

A: The MINIASMDC075F/33-2 has a trip current (It) of 1.6 A with 1 second time-to-trip, while the PTSA181233V075 specifies 1.5 A trip current with 300 milliseconds time-to-trip. Application circuits requiring specific response timing should account for these differences.

Q: Are both parts suitable for automotive applications?

A: Yes, both components carry AEC-Q200 qualification, confirming suitability for automotive-grade reliability and performance standards.

Q: What is the significance of the resistance specifications?

A: Initial resistance (Ri) and post-trip resistance (R1) affect circuit behavior during normal operation and after protection activation. The MINIASMDC075F/33-2 has higher initial resistance (110 mOhms) and lower post-trip resistance (390 mOhms), while the PTSA181233V075 has lower initial resistance (70 mOhms) and higher post-trip resistance (480 mOhms). Circuit design should account for these impedance characteristics.

Q: Does packaging format differ between these parts?

A: Both parts use identical 1812 (4532 Metric) concave surface mount packages. The MINIASMDC075F/33-2 is supplied in Bulk packaging, while the PTSA181233V075 is supplied in Tape & Reel format. This affects handling and assembly processes but not electrical or mechanical compatibility.

Q: Which part offers better moisture protection?

A: The PTSA181233V075 has MSL 1 (Unlimited moisture sensitivity level), providing superior protection compared to the MINIASMDC075F/33-2 with MSL 2A (4 Weeks). This is advantageous for extended storage and humid manufacturing environments.