# SCT9339STER

**SCT** · DC-DC Converters · ESOP-8

SCT9339STER from SCT, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BOOT | passive | Bootstrap supply for the high-side power MOSFET gate driver. Connect a 0.1uF (or greater) ceramic capacitor between BOOT and SW to generate the boosted gate-drive voltage. |
| 2 | VIN | power_in | Power supply input, 3.8V to 28V. Must be locally bypassed with a ceramic capacitor close to the pin. |
| 3 | EN | input | Enable logic input. Floating the pin enables the device; supports high-voltage input up to VIN so it can be tied directly to VIN for auto-enable. Precision thresholds of 1.18V rising / 1.1V falling allow programmable UVLO via a resistor divider. |
| 4 | NC | unconnected | No internal connection. Leave floating or tie to a convenient node. |
| 5 | FB | input | Buck converter output feedback sensing input. Connect a resistor divider from VOUT to FB to program the output voltage; the device regulates FB to the internal 0.8V (±1%) reference. |
| 6 | NC | unconnected | No internal connection. Leave floating or tie to a convenient node. |
| 7 | NC | unconnected | No internal connection. Leave floating or tie to a convenient node. |
| 8 | SW | power_out | Switching node of the buck converter. Connect to the external inductor; also serves as the bootstrap capacitor return reference for the BOOT pin. |
| 9 | GND (Thermal Pad) | power_in | Exposed thermal pad on the bottom of the ESOP-8 package. Serves as device ground and the heat-dissipation path; must be soldered to the PCB ground plane for proper operation and thermal performance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SCT |
| Package | ESOP-8 |
| Category | PMIC |
| Pins | 9 |

## Ordering variants

Same part, different packaging or reel option.

- `SCT9339STER`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating input voltage range | VIN | 3.8 |  | 28 | V |  | 3 |
| Feedback reference voltage tolerance (printed as 0.8V ±1%) | VFB | -1 |  | 1 | % |  | 1 |
| Shutdown current | ISD |  | 1 | 3 | uA | EN=0, No load, VIN=12V | 3 |
| Human Body Model ESD rating, all pins | VESD | -2 |  | 2 | kV | HBM, per ANSI-JEDEC-JS-001-2014 | 3 |
| Charged Device Model ESD rating, all pins | VESD | -0.5 |  | 0.5 | kV | CDM, per ANSI-JEDEC-JS-002-2014 | 3 |
| BST pin voltage | BST | -0.3 |  | 38 | V |  | 2 |
| VIN, SW, EN pin voltage | VIN, SW, EN | -0.3 |  | 34 | V |  | 2 |
| FB pin voltage | FB | -0.3 |  | 5.5 | V |  | 2 |
| Operating junction temperature (absolute maximum) | TJ | -40 |  | 125 | °C | Over operating free-air temperature | 2 |
| Storage temperature | TSTG | -65 |  | 150 | °C |  | 2 |
| Operating junction temperature (recommended) | TJ | -40 |  | 125 | °C | Over operating free-air temperature range | 3 |
| Junction to ambient thermal resistance (ESOP-8L) | RθJA |  | 42 |  | °C/W |  | 3 |
| Junction to case thermal resistance (ESOP-8L) | RθJC |  | 45.8 |  | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `SCT9339STER`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `sct9339ster-etched.step` / `sct9339ster-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sct9339ster.step` / `sct9339ster.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [SCT datasheet](docs/sct9339ster-datasheet.pdf) (19 pp, sha256 `d8867bdb12241602`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sct9339ster-datasheet.pdf)