Request Quote
(Ships tomorrow)
MF-NSML300-2 PTC Resettable Fuse Equivalent & Substitute Parts
Part Overview
The MF-NSML300-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 6V at 3A hold current in a 1206 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The MF-NSML300/6-2 serves as a direct functional equivalent with identical electrical ratings and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Max | 6V |
| Current - Hold (Ih) (Max) | 3 A |
| Current - Trip (It) | 6 A |
| Current - Max | 50 A |
| Mounting Type | Surface Mount |
| Package / Case | 1206 (3216 Metric), Concave |
| Operating Temperature | -40°C ~ 85°C |
| Type | Polymeric |
| Approval Agency | cURus, TUV |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
The MF-NSML300/6-2 qualifies as a direct substitute for the MF-NSML300-2 based on the following critical parameters:
- Identical voltage rating: 6V maximum
- Identical hold current (Ih): 3A maximum
- Identical trip current (It): 6A
- Identical maximum current: 50A
- Identical package: 1206 (3216 Metric), Concave
- Identical mounting type: Surface Mount
- Identical operating temperature range: -40°C ~ 85°C
- Identical material type: Polymeric PTC
- Identical regulatory approvals: cURus, TUV
- Identical RoHS compliance: ROHS3 Compliant
The substitute part maintains full electrical and mechanical compatibility with the original specification.
Parameter Comparison
| Parameter | MF-NSML300-2 | MF-NSML300/6-2 | Compatibility |
|---|---|---|---|
| Voltage - Max | 6V | 6V | Identical |
| Current - Hold (Ih) (Max) | 3 A | 3 A | Identical |
| Current - Trip (It) | 6 A | 6 A | Identical |
| Current - Max | 50 A | 50 A | Identical |
| Time to Trip | 4 s | 5 s | Minor variance |
| Resistance - Initial (Ri) (Min) | 2.5 mOhms | 3 mOhms | Minor variance |
| Resistance - Post Trip (R1) (Max) | 20 mOhms | 24 mOhms | Minor variance |
| Thickness (Max) | 0.024" (0.60mm) | 0.055" (1.40mm) | Dimensional variance |
| Package / Case | 1206 (3216 Metric), Concave | 1206 (3216 Metric), Concave | Identical |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | Identical |
| Mounting Type | Surface Mount | Surface Mount | Identical |
| Approval Agency | cURus, TUV | cURus, TUV | Identical |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Identical |
| Product Status | Obsolete | Active | Substitute is active |
Engineering Selection Recommendations
The MF-NSML300/6-2 is the appropriate selection for applications currently specified with MF-NSML300-2. The substitute part maintains identical electrical performance across all critical parameters: voltage rating, hold current, trip current, and maximum current capacity. Both components carry identical regulatory certifications (cURus, TUV) and RoHS3 compliance status, ensuring regulatory continuity.
The primary distinction is product status: MF-NSML300-2 is obsolete while MF-NSML300/6-2 is active, with documented inventory availability. Minor variations in time-to-trip (1 second difference), initial resistance (0.5 mOhms difference), and post-trip resistance (4 mOhms difference) fall within acceptable engineering tolerances for PTC resettable fuse applications. The thickness variance (0.031" difference) requires PCB layout verification for clearance compatibility.
Frequently Asked Questions (FAQ)
Q: Can MF-NSML300/6-2 be used as a direct replacement for MF-NSML300-2?
A: Yes. Both parts share identical voltage, current, temperature, package, and mounting specifications. The substitute is electrically and mechanically compatible for direct board-level substitution.
Q: What are the differences between these two parts?
A: The primary differences are product status (obsolete vs. active) and minor parameter variations: time-to-trip differs by 1 second, initial resistance by 0.5 mOhms, post-trip resistance by 4 mOhms, and thickness by 0.031 inches. These variations are within normal manufacturing tolerances for this component category.
Q: Does the thickness difference affect PCB design?
A: The MF-NSML300/6-2 is thicker (0.055" vs. 0.024"). Verify clearance above the component on the PCB to ensure no interference with adjacent components or enclosure constraints.
Q: Are both parts certified to the same standards?
A: Yes. Both MF-NSML300-2 and MF-NSML300/6-2 carry identical certifications: cURus and TUV approval, with ROHS3 compliance and REACH unaffected status.
Q: Why is MF-NSML300-2 obsolete?
A: Product obsolescence is determined by the manufacturer. MF-NSML300/6-2 represents the active equivalent in the Multifuse MF-NSML series and should be specified for new designs.
Q: What packaging options are available for MF-NSML300/6-2?
A: MF-NSML300/6-2 is available in Cut Tape (CT) and Digi-Reel packaging formats.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts