# SS540S

**orisilicon** · AC-DC Controllers & Regulators · ESOP-8

SS540S from orisilicon, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Chip ground. |
| 2 | VOUT | power_out | Regulated output pin; output is about 22V (typ) for input above 22V and follows the input below 22V. |
| 3 | NC | unconnected | No connect, left floating. |
| 4 | NC | unconnected | No connect, left floating. |
| 5 | NC | unconnected | No connect, left floating. |
| 6 | NC | unconnected | No connect, left floating. |
| 7 | NC | unconnected | No connect, left floating. |
| 8 | VAC | power_in | High-voltage power supply input, 22 VDC to 700 VDC. |
| 9 | Epad | power_in | Exposed pad connected to chip ground, used for heat dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | orisilicon |
| Package | ESOP-8 |
| Category | Power Management ICs |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power supply input voltage | VAC |  |  | 700 | V | VAC = 80VDC; COUT = 10µF; TA = 25°C | 2 |
| Supply current (quiescent) | IQ |  | 20 | 50 | µA | VAC = 80VDC | 2 |
| Output voltage | VOUT |  | 24 |  | V | IOUT=1uA@VAC=80VDC | 2 |
| Output voltage | VOUT |  | 6 |  | V | IOUT =11mA@VAC=80VDC | 2 |
| Line regulation | ΔVOUT |  | 200 |  | mV | IOUT =1mA , VAC=25VDC to 700VDC | 2 |
| Load regulation | ΔVOUT |  | 15 |  | V | IOUT =1uA to 11mA | 2 |
| Short-circuit current | ISC |  | 22 |  | mA | VAC=80VDC | 2 |
| Output overvoltage | VOVP |  | 30 |  | V | VAC= VO | 2 |
| Input voltage range |  | 22 |  | 700 | VDC |  | 1 |
| Operating temperature range | Ta | -40 |  | 125 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `SS540S`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `ss540s-etched.step` / `ss540s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ss540s.step` / `ss540s.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [orisilicon datasheet](docs/ss540s-datasheet.pdf) (7 pp, sha256 `ce28954bcda86996`, retrieved 2026-10-22, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ss540s-datasheet.pdf)