# MST1694KC-B49

**MST** · AC-DC Controllers And Regulators · SOP-8

MST1694KC-B49 from MST, in a SOP-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 | S | passive | MOSFET source pin of the internal 60V power MOSFET; the datasheet gives no separate electrical limit for this pin. |
| 2 | S | passive | MOSFET source pin of the internal 60V power MOSFET; the datasheet gives no separate electrical limit for this pin. |
| 3 | VCC | power_in | Chip supply pin; absolute maximum VCC is -0.3 to 7 V, UVLO rising threshold is 3 V with 0.4 V hysteresis, and the VCC set voltage is 5 to 5.8 V (5.6 V typical). |
| 4 | VO | power_out | Internal supply pin used to charge from the power path; absolute maximum VO is -0.3 to 25 V and the datasheet lists a 65 mA VOUT charging current at VO=5V, VCC=3.5V. |
| 5 | D | passive | MOSFET drain pin of the internal 60V power MOSFET; absolute maximum VDD is -0.7 to 60 V. |
| 6 | D | passive | MOSFET drain pin of the internal 60V power MOSFET; absolute maximum VDD is -0.7 to 60 V. |
| 7 | D | passive | MOSFET drain pin of the internal 60V power MOSFET; absolute maximum VDD is -0.7 to 60 V. |
| 8 | D | passive | MOSFET drain pin of the internal 60V power MOSFET; absolute maximum VDD is -0.7 to 60 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MST |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VCC withstand voltage (absolute max) | VCC | -0.3 |  | 7 | V |  | 3 |
| VOUT withstand voltage (absolute max) | Vo | -0.3 |  | 25 | V |  | 3 |
| D withstand voltage (absolute max) | VDD | -0.7 |  | 60 | V |  | 3 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 3 |
| Maximum switching frequency | FMAX |  |  | 200 | KHz |  | 3 |
| Soldering temperature | Tsolder |  |  | 260 | ℃ | 10s | 3 |
| ESD human body model (HBM) | VESD |  |  | 6 | KV | HBM | 3 |
| VCC set voltage |  | 5 | 5.6 | 5.8 | V |  | 4 |
| Turn-on threshold | VON_TH | -250 | -260 | -300 | mV |  | 4 |
| Turn-off threshold | VOFF_TH1 | -20 | -12 | -9 | mV |  | 4 |
| Clamp voltage | VREG(DRV) | -50 | -40 | -32 | mV |  | 4 |
| Minimum on-time | TON_MIN | 550 | 650 | 800 | ns |  | 4 |
| Minimum off-time | TOFF_MIN | 0.9 | 1.2 | 1.5 | us |  | 4 |
| Maximum drive current |  |  |  | 0.8 | A |  | 4 |
| Maximum sink current |  |  |  | 4.5 | A |  | 4 |
| Thermal resistance, junction to ambient (SOP8) | ΘJA |  | 150 |  | ℃/W |  | 3 |

## CAD (KiCad official)

- Symbol: `MST1694KC-B49`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `mst1694kc-b49-etched.step` / `mst1694kc-b49-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mst1694kc-b49.step` / `mst1694kc-b49.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MST datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603385073408626688) (11 pp, sha256 `557174f9fd46d697`, retrieved 2026-10-18, 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-haiku-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/mst1694kc-b49-datasheet.pdf)