MF-USMD010-2 Equivalent & Substitute Parts

Part Overview

The MF-USMD010-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 30V maximum voltage with 100 mA hold current. This component is classified as Obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement. The part operates across a temperature range of -40°C to 85°C and is housed in a 1210 (3225 Metric) surface mount package. Due to its obsolete status, direct replacements from active product lines are required for new designs and production continuity.

Substiute Parts

MF-USMD010-2

Bourns Inc.In Stock: 799MF-USMD010-2 Datasheet

Current PartRFQ

MF-USMF010-2

Bourns Inc.In Stock: 5837MF-USMF010-2 Datasheet

DirectRFQ

MICROSMD010F-2

Littelfuse Inc.In Stock: 29520MICROSMD010F-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-USMD010-2 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Voltage rating: 30V maximum
• Current hold (Ih): 100 mA maximum
• Mounting type: Surface Mount
• Package: 1210 (3225 Metric)
• Component type: Polymeric PTC Resettable Fuse

Allowable Variation Parameters:

• Current trip (It): Acceptable range 250–300 mA
• Time to trip: Acceptable range 600 ms–1 s
• Resistance initial (Ri): Acceptable range 800 mOhms–2.1 Ohms
• Resistance post-trip (R1): Maximum 15 Ohms
• Product status: Active preferred for new procurement
• RoHS compliance: ROHS3 compliant preferred
• Approval agencies: CSA, TUV, UL acceptable

Two substitute parts meet these criteria: MF-USMF010-2 (Bourns Inc., direct manufacturer alternative) and MICROSMD010F-2 (Littelfuse Inc., cross-manufacturer equivalent).

Parameter Comparison

Engineering Selection Recommendations

MF-USMF010-2 (Bourns Inc.) is the primary recommended substitute. This part maintains identical electrical specifications to the main part, including current trip (It) of 300 mA and initial resistance (Ri) of 800 mOhms. It carries Active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant and holds cURus and TUV certifications. The concave package variant is mechanically compatible with standard 1210 footprints. Moisture sensitivity level remains at MSL 1 (Unlimited), matching the original part's handling requirements.

MICROSMD010F-2 (Littelfuse Inc.) serves as a secondary cross-manufacturer equivalent. This part meets all mandatory electrical criteria but exhibits differences in current trip (It) of 250 mA (versus 300 mA) and initial resistance (Ri) of 2.1 Ohms (versus 800 mOhms). Time to trip extends to 1 second compared to 600 milliseconds. The part is ROHS3 compliant with CSA, TUV, and UL certifications. Moisture sensitivity level is MSL 2A (4 Weeks), requiring controlled storage conditions. This substitute is suitable for applications where the specified parameter variations are acceptable within circuit design tolerances.

Frequently Asked Questions (FAQ)

Q: Can MF-USMF010-2 be used as a direct drop-in replacement for MF-USMD010-2?

A: Yes. Both parts share identical voltage (30V), current hold (100 mA), current trip (300 mA), initial resistance (800 mOhms), and operating temperature range (-40°C to 85°C). The 1210 (3225 Metric) package dimensions are identical. The concave variant of MF-USMF010-2 is mechanically compatible with standard 1210 footprints.

Q: What are the key differences between MF-USMF010-2 and MICROSMD010F-2?

A: Current trip differs: MF-USMF010-2 is 300 mA while MICROSMD010F-2 is 250 mA. Initial resistance differs: MF-USMF010-2 is 800 mOhms while MICROSMD010F-2 is 2.1 Ohms. Time to trip differs: MF-USMF010-2 is 600 ms while MICROSMD010F-2 is 1 second. Moisture sensitivity differs: MF-USMF010-2 is MSL 1 (Unlimited) while MICROSMD010F-2 is MSL 2A (4 Weeks).

Q: Why is MF-USMF010-2 preferred over MICROSMD010F-2?

A: MF-USMF010-2 maintains identical electrical specifications to the original MF-USMD010-2, including current trip and initial resistance values. It requires no circuit re-evaluation. MICROSMD010F-2 introduces parameter variations that may require circuit analysis to confirm compatibility.

Q: Are there packaging differences between these parts?

A: All three parts use the 1210 (3225 Metric) surface mount package with identical dimensions (0.127" L x 0.102" W, 3.22mm x 2.58mm) and thickness (0.033", 0.85mm). MF-USMF010-2 and MICROSMD010F-2 feature concave package variants, which are standard for modern 1210 resettable fuses and compatible with existing PCB layouts.

Q: What compliance differences exist between these parts?

A: MF-USMD010-2 is RoHS non-compliant. MF-USMF010-2 and MICROSMD010F-2 are both ROHS3 compliant. All three parts are REACH Unaffected and classified as EAR99. Certification agencies differ: MF-USMD010-2 holds CSA, TUV, UR; MF-USMF010-2 holds cURus, TUV; MICROSMD010F-2 holds CSA, TUV, UL.

Q: What is the inventory status for these parts?

A: MF-USMD010-2 (Obsolete): 774 Pcs. MF-USMF010-2 (Active): 5744 Pcs. MICROSMD010F-2 (Active): 29431 Pcs. Active parts ensure sustained availability for production requirements.