ASMD075F-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The ASMD075F-2 is an active polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® ASMD series. This component provides overcurrent protection at 30V with a 600 mA hold current rating in a compact 2-SMD surface mount package. The part is ROHS3 compliant and rated to AEC-Q200 standards.

Substitute parts are identified based on matching or exceeding the critical electrical parameters: maximum voltage rating, hold current capability, trip current characteristics, operating temperature range, and physical package compatibility for surface mount assembly.

Substiute Parts

ASMD075F-2

Littelfuse Inc.In Stock: 1016ASMD075F-2 Datasheet

Current PartRFQ

2920L075DR

Littelfuse Inc.In Stock: 1213922920L075DR Datasheet

MFR RecommendedRFQ

MF-SM075-2

Bourns Inc.In Stock: 6160MF-SM075-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ASMD075F-2 are qualified based on the following critical parameters:

• Voltage Rating: All substitutes must maintain the 30V maximum voltage specification
• Hold Current (Ih): Substitutes rated at 750 mA or higher satisfy applications requiring the 600 mA hold current
• Trip Current (It): Substitutes with 1.5 A trip current are compatible with the 1.48 A specification
• Operating Temperature: All substitutes maintain the -40°C to 85°C operating range
• Surface Mount Compatibility: All substitutes are surface mount devices suitable for automated assembly
• Compliance: All substitutes are ROHS3 compliant and rated for industrial applications

The two identified substitutes represent different manufacturers and package styles within the polymeric PTC resettable fuse category, each meeting the electrical requirements of the ASMD075F-2.

Parameter Comparison

Engineering Selection Recommendations

2920L075DR (Littelfuse Inc.)

This substitute maintains manufacturer continuity within the Littelfuse portfolio. The 750 mA hold current exceeds the 600 mA requirement. The 2920 package format is dimensionally compatible with the ASMD075F-2 footprint. The reduced thickness of 0.049" (1.25mm) versus 0.125" (3.18mm) provides a lower profile option for space-constrained applications. Both parts carry cURus and TUV certifications. The faster trip time of 300 ms versus 20 s represents a significant change in protection response characteristics and must be evaluated against circuit requirements.

MF-SM075-2 (Bourns Inc.)

This substitute provides cross-manufacturer compatibility using the Bourns Multifuse® platform. The 750 mA hold current exceeds the 600 mA specification. The 2-SMD package matches the ASMD075F-2 form factor exactly, with dimensions within 0.003" of the original part. The 80 A maximum current rating provides higher fault current handling than the 40 A specification of the ASMD075F-2. MSL rating of 1 (Unlimited) offers superior moisture handling compared to the 2A (4 Weeks) rating. Both parts carry AEC-Q200 certification. The faster trip time of 300 ms versus 20 s represents a significant change in protection response characteristics and must be evaluated against circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2920L075DR be used as a direct replacement for the ASMD075F-2?

A: The 2920L075DR meets the voltage, hold current, and operating temperature requirements. However, the package format differs (2920 Concave versus 2-SMD), requiring PCB footprint verification. The significantly faster trip time (300 ms versus 20 s) must be evaluated for circuit compatibility.

Q: What is the primary difference between the MF-SM075-2 and ASMD075F-2?

A: Both parts use identical 2-SMD package geometry and maintain 30V voltage ratings. The MF-SM075-2 has a higher hold current (750 mA versus 600 mA), lower initial resistance (230 mOhms versus 290 mOhms), superior moisture sensitivity rating (MSL 1 versus MSL 2A), and faster trip response (300 ms versus 20 s).

Q: Are all three parts ROHS3 compliant?

A: Yes. The ASMD075F-2, 2920L075DR, and MF-SM075-2 are all ROHS3 compliant and suitable for applications requiring lead-free component specifications.

Q: Which substitute has the best moisture handling characteristics?

A: The MF-SM075-2 carries an MSL rating of 1 (Unlimited), compared to MSL 2A (4 Weeks) for both the ASMD075F-2 and 2920L075DR. This indicates superior moisture resistance for the Bourns part.

Q: Does the higher maximum current rating of the MF-SM075-2 (80 A versus 40 A) affect substitution suitability?

A: No. The maximum current rating indicates fault current handling capability. A higher rating does not compromise circuit protection and provides additional margin for transient events.

Q: What is the impact of the different trip times on circuit operation?

A: The ASMD075F-2 has a 20-second trip time, while both substitutes have 300 millisecond trip times. This represents a 67-fold faster response. Circuit designers must verify that the faster protection response does not cause nuisance trips during normal inrush current conditions or that the slower response of the original part is not required for specific application timing.