MF-FSML125/8-2 Bourns Resettable Fuse (Fuses Chip) In Stock
Bourns MF-FSML125/8-2 is a surface mount resettable PTC fuse chip in a compact 1.85 x 1.05 x 0.7 mm SMT package, providing overcurrent and overtemperature protection for USB ports, battery packs, and portable electronic circuits.
- Manufacturer
- Bourns
- Package
- Fuses Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- MF-FSML125/8-2 Datasheet PDF
- Category
- Resettable Fuse
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Resettable PTC fuse with automatic recovery after overcurrent fault clearance, eliminating manual fuse replacement
- Ultra-compact SMT chip package (1.85 x 1.05 x 0.7 mm) for space-constrained PCB designs
- Minimum resistance specified at 23°C for accurate hold current and circuit protection modeling
- REACH compliant and lead-free (JESD-609 e4) for modern electronics manufacturing
- Surface mount mounting for automated reflow soldering in high-volume production
Applications
The MF-FSML125/8-2 is designed for overcurrent protection in USB ports, lithium-ion battery packs, and portable consumer electronics where automatic reset after fault removal is required. Its compact 1.85 mm x 1.05 mm SMT footprint also makes it suitable for space-constrained designs in IoT sensors, wearables, and industrial handheld devices needing passive self-resetting protection.
Specifications
| Reach Compliance Code | Compliant |
| Factory Lead Time | 14Weeks |
| YTEOL | 8 |
| Additional Feature | RMIN AT 23 DEG CEL |
| JESD-609 Code | e4 |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 0.7mm |
| Package Length | 1.85mm |
| Package Style | SMT |
| Package Width | 1.05mm |
| Packing Method | TR, 7 INCH |
| Reference Standard | CUL, TUV, UL |
| Resistance | 0.02Ω |
| Resistor Type | PTC RESETTABLE FUSE |
| Surface Mount | YES |
| Terminal Finish | Gold (Au) - with Nickel (Ni) barrier |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | WRAPAROUND |
| Working Voltage | 8V |
| Package | Fuses Chip |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.40.80.70 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does MF-FSML125/8-2 protect USB ports from overcurrent conditions in portable devices?
The MF-FSML125/8-2 is a resettable PTC fuse that trips when current exceeds its hold current threshold, typically around 1.25 A, interrupting the fault path and automatically resetting after the overcurrent condition is removed and the device cools.
What are the physical dimensions of the MF-FSML125/8-2 chip package for PCB footprint planning?
The MF-FSML125/8-2 measures 1.85 mm in length, 1.05 mm in width, and 0.7 mm in height, fitting an industry-standard SMT chip footprint that is compatible with 0603 or similar compact surface mount land patterns on standard PCBs.
Why does MF-FSML125/8-2 specify minimum resistance at 23°C and how does this affect circuit design?
The minimum resistance at 23°C allows designers to calculate the fuse's contribution to circuit impedance accurately. For the MF-FSML125/8-2, knowing the PTC resistance at room temperature helps set correct hold current margins to prevent nuisance tripping across all 8 units in a multi-channel protection design.
What is the factory lead time for MF-FSML125/8-2 and how should procurement teams manage supply planning?
The factory lead time for MF-FSML125/8-2 is 14 weeks, so procurement teams should buffer stock or place purchase orders at least 4 months in advance, especially for production volumes requiring continuous supply of this REACH-compliant SMT fuse.
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