2SC4672T100Q DK NPN Silicon Transistor for Lovecore A1 PSU
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2SC4672T100Q NPN Silicon Epitaxial Transistor | Lovecore / Loveminer A1 PSU Repair
The 2SC4672T100Q is a high-performance NPN silicon epitaxial transistor packaged in the MPT-3 surface-mount form factor — the gate-drive / bias-supply switching transistor used across the Lovecore / Loveminer A1 PSU primary-side control stage. The DK suffix denotes a tape-and-reel packing variant for SMT placement.
Built on a silicon-epitaxial NPN structure, the part offers a 50V collector-emitter breakdown voltage (Vceo), 3A continuous collector current, and a notably low Vce(sat) of 130mV at Ic = 1A — the saturation voltage that drives heat dissipation in switching applications. The 210MHz transition frequency (fT) supports the high-frequency switching operation needed in PSU gate-drive boost circuits, where fast turn-on / turn-off transitions reduce switching losses on the main MOSFET.
Where the 2SC4672T100Q Fits in Lovecore A1 PSU
- Gate-drive output transistor on the primary-side PWM controller — drives the main switching MOSFET gate via a transformer or direct coupling.
- Bias-supply rectifier auxiliary — provides start-up bias to the PWM controller before the auxiliary winding takes over.
- Output-stage signal switching for protection and feedback loop dynamics.
- Optocoupler-side drive for isolated feedback signalling.
When to Replace the 2SC4672T100Q
- PSU fails to start — no output voltage, no audible startup tick from the transformer.
- PSU pulses on and off repeatedly (hiccup mode) without ever latching to full operation.
- Burnt or visibly cracked transistor body, often near the PWM controller IC.
- Multimeter diode test shows shorted or open junction.
- Replacement of the main switching MOSFET on its own does not restore PSU operation.
2SC4672T100Q Specifications
| Feature | Specification |
|---|---|
| Type | NPN Silicon Epitaxial Transistor |
| Package | MPT-3 (Surface-Mount) |
| Vceo (Collector-Emitter Breakdown) | 50V |
| Ic (Continuous Collector Current) | 3A |
| Vce(sat) | 130mV (Ic = 1A) |
| Pd (Power Dissipation) | 500mW |
| fT (Transition Frequency) | 210MHz |
| hFE (DC Current Gain) | Standard NPN gain range |
| Packing | Tape-and-reel (DK suffix) |
| Application | Lovecore / Loveminer A1 PSU gate-drive and bias-supply switching |
FAQ — 2SC4672T100Q NPN Transistor
Q: What does the "T100Q" and "DK" suffix mean?
A: T100Q encodes the package/temperature grade; DK is the tape-and-reel packing variant for automated SMT placement. The electrical specs are identical to the bulk-packed version.
Q: Is this drop-in compatible with the original Loveminer A1 PSU board?
A: Yes — the MPT-3 footprint is the OEM-spec package on the Loveminer A1 PSU. Confirm the silk-mark orientation before reflow.
Q: Can I substitute another 50V/3A NPN like 2SC2655?
A: Electrically the specs are similar but the MPT-3 package is required for SMD placement. Through-hole substitutes (TO-92) won't fit the original pads. For drop-in repair, match the part exactly.
Q: Rework profile for MPT-3?
A: Hot-air rework at 350°C with controlled airflow. Apply flux, preheat the board to 100°C, lift the failed part with tweezers, place fresh part with correct orientation, reflow.
Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.
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Lovecore / Loveminer A1 PSU repair benches stocking 2SC4672T100Q in volume? Email contact@lys-sz.com for bulk pricing and matched PSU repair kits. Worldwide shipping from our Shenzhen warehouse.
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