MF-MSMF250/16X-2 – Comprehensive Technical Summary
(Extracted from Bourns® MF-MSMF Series PTC Resettable Fuse Datasheet)

1. Device Overview1.1 Series: MF-MSMF (Multifuse® Surface-Mount PPTC)1.2 Size: 1812 (4.5 × 3.2 mm)1.3 Voltage Option: 16 V1.4 Packaging Suffix: –2 = EIA-481 embossed tape & reel
2. Electrical Ratings @ 23 °C (still air)2.1 Maximum working voltage (Vmax): 16 Vdc2.2 Maximum interrupt current (Imax): 100 A2.3 Hold current (Ihold): 2.50 A2.4 Trip current (Itrip): 5.00 A2.5 Initial resistance (Rmin): 0.015 Ω2.6 Post-trip resistance (R1max): 0.100 Ω2.7 Time-to-trip @ 8 A: 5.0 s (max)2.8 Power dissipation when tripped (Pd typ): 1.2 W
3. Environmental & Reliability3.1 Operating temperature: –40 °C to +85 °C3.2 Passive ageing: 1 000 h @ 85 °C, ΔR ≤ ±5 %3.3 Humidity ageing: 1 000 h @ 85 °C / 85 %RH, ΔR ≤ ±5 %3.4 Thermal shock: –40 °C ↔ +85 °C, 20 cycles, ΔR ≤ ±10 %3.5 Moisture sensitivity level (MSL): see MSL note (JEDEC J-STD-020)3.6 ESD classification: Class 6 (AEC-Q200-2 HBM)
4. Agency & Compliance4.1 cUL Recognition: E174545 (UL 1434)4.2 TÜV Approval: IEC 62319-1, IEC 60738-1, IEC 60730-14.3 AEC-Q200 qualified: YES (automotive grade)4.4 RoHS: 2015/863 compliant, halogen-free per Bourns definition (Br ≤ 900 ppm, Cl ≤ 900 ppm, Br+Cl ≤ 1 500 ppm)
5. Mechanical Data5.1 Body outline: 1812 (Style-2, low-profile)5.2 Terminal finish: ENIG (Electroless Ni / Immersion Au)5.3 Thickness: 0.70 mm (0.028 in) max5.4 Weight: ≈ 0.10 g
6. Packaging Information6.1 Standard reel qty: 1 000 pcs6.2 Tape width: 12 mm7-inch reel diameter: 185 mm max6.3 Leader/trailer: 390 mm / 160 mm minimum
7. Thermal Derating (Ihold vs. Tamb)Tamb (°C) | Ihold (A)-40 | 3.90-20 | 3.420 | 2.9623 | 2.5040 | 2.2450 | 1.9860 | 1.8570 | 1.2985 | 0.94
8. Soldering & Assembly8.1 Reflow method: IR, vapor phase, hot-plate, nitrogen (Pb or Pb-free)8.2 Peak temperature: 260 °C (max 40 s within 5 °C of peak)8.3 Ramp-up: ≤ 3 °C/s; ramp-down: ≤ 6 °C/s8.4 Hand soldering: NOT recommended8.5 Wave soldering: allowed only when device is on top side, opposite heat source
9. Ordering DescriptorMF-MSMF250/16X-2│ │ │ │ │ └─ Packaging: –2 = tape & reel│ │ │ │ └─── X = Multifuse expansion voltage option│ │ │ └──── 16 = 16 V rated voltage│ │ └────── 250 = 2.50 A hold current│ └──────── MSMF = 1812 PPTC series└────────── MF = Bourns Multifuse product family
10. Typical Part MarkingLaser mark: “C” (bi-weekly date code) + “250” (Ihold code) + year code (e.g., “5” for 2025)
11. Applications• USB-C / USB-PD port protection• 12 V / 24 V automotive infotainment & lighting rails• Industrial sensor power buses• SSD & server back-plane hot-swap protection• Any circuit where 16 Vdc / 2.5 A hold and 100 A interrupt capability are required
12. Cautions & Legal• Do not exceed Vmax, Imax, or maximum temperature specifications• Device expands when tripped; ensure adequate clearance and avoid rigid potting• Avoid aggressive solvents (xylene, toluene, strong acids, silicon oils)• Not qualified for nuclear, life-saving, or aerospace use without explicit Bourns written approval• Users must verify performance in their specific application; parameters may vary with layout, ambient, and load conditions