The SI-3000N series is a 3-terminal, full-mold, low dropout voltage dropper type with an output current of 1.0A and a low dropout voltage of 1V. The series features foldback overcurrent, overvoltage and thermal protection circuits. It is suitable for stabilization of the secondary stage of switching power supplies.
The SI-3000N series from Sanken provides a compact full‑mold voltage dropper solution for stabilizing the secondary stage of switching power supplies. It delivers up to 1.0 A output with a low dropout voltage of about 1 V and includes built‑in foldback over‑current, over‑voltage, and thermal protection circuits.
The datasheet lists detailed electrical characteristics, absolute maximum ratings, and typical performance curves. It also specifies recommended external components such as tantalum input capacitors and a protection diode (Sanken EU2Z). The device is supplied in a UL94V‑0 rated full‑mold package weighing approximately 2.3 g.
| Output current | 1.0 A |
|---|---|
| Low dropout voltage | ~1 V (at Iout=1.0A) |
| DC input voltage range | 25‑35 V |
| Power dissipation (no heatsink) | 1.5 W |
| Junction temperature range | -40 °C to +125 °C |
| Ambient operating temperature | -30 °C to +100 °C |
| Thermal resistance (junction‑to‑case) | 7.0 °C/W |
| Package type | Compact full‑mold (UL94V‑0) |
| Weight | Approx. 2.3 g |
It includes built‑in foldback over‑current, over‑voltage, and thermal protection circuits.
The Sanken EU2Z diode is recommended for protection against reverse biasing.
It is used for stabilization of the secondary stage of switching power supplies and other electronic equipment.
The package meets UL94V‑0 flammability rating.