component
MST2218KCD
Public Made by Adomby adom
MST DC-DC Converters, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MST2218KCD
MST · DC-DC Converters · SOIC-8
MST2218KCD from MST, in a SOIC-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 | IS | input | Source of the integrated power MOSFET; a sense resistor to GND sets the primary peak current (Ipeak = VIS/Rs, with the 150 mV current sampling threshold), and the Input (VS/ZS/IS) to GND absolute maximum is 5.3 V. |
| 2 | VCC | power_in | Supply pin for the chip, connected to the positive side of the input capacitor and the clamp resistor; the datasheet gives an undervoltage lockout of 3.3 to 3.5 V, an input clamp voltage of 10 to 16 V, and an absolute maximum of 15 V to GND. |
| 3 | VS | power_in | Voltage feedback input used to sense the output voltage, with a monitoring threshold of 1.92 to 2.08 V and an absolute maximum input of 5.3 V to GND. |
| 4 | ZS | input | Input of the zero-crossing comparator, with a short-circuit protection threshold of 1.5 V and an absolute maximum input of 5.3 V to GND. |
| 5 | GND | power_in | System ground, connected to the negative terminal of the input supply and to the negative sides of the input and output capacitors. |
| 6 | GND | power_in | Enlarged copper foil at this pin increases the heat dissipation capability of the control circuit; the datasheet gives no other electrical function for it. |
| 7 | SW | output | Drain of the integrated 100 V power MOSFET (absolute maximum 100 V to GND, RDSon 100 mΩ at VCC=10V, ID=3A); enlarged copper here improves MOSFET heat dissipation, and the snubber capacitor must keep SW below 70 V after turn-off. |
| 8 | SW | output | Second SW pin shown in the application circuit and package drawing as the power MOSFET drain; the pin table row gives no name or description for it. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MST |
| Package | SOIC-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 to GND (note 1) | -0.3 | 15 | V | 2 | |||
| SW to GND | -0.3 | 100 | V | 2 | |||
| Input (VS\ZS\IS) to GND | -0.3 | 5.3 | V | 2 | |||
| IS peak current | 4 | A | 2 | ||||
| 工作环境温度 (operating ambient temperature) | -40 | 85 | ℃ | 2 | |||
| 存储温度 (storage temperature) | -40 | 150 | ℃ | 2 | |||
| 封装热阻 SOP8 (package thermal resistance) | 90 | ℃/W | SOP8 | 2 | |||
| 封装最大功耗 SOP8 (max package power dissipation) | Pdmax | 800 | mW | SOP8 | 2 | ||
| 人体模式 HBM (ESD) | 4 | kV | 2 | ||||
| Latch-up | 200 | mA | 2 | ||||
| 工作电压范围 (operating voltage range) | VIN | 4.5 | 14 | V | 3 | ||
| 输入钳位电压 (input clamp voltage) | VCCCLAMP | 10 | 13 | 16 | V | 3 | |
| 输入钳位电流 (input clamp current) | ICLAMP | 30 | mA | VCC=15V | 3 | ||
| 工作电流 (operating current) | ICC | 500 | uA | VCC=8V, 工作频率 100kHz | 3 | ||
| 电压监测阈值 (voltage monitor threshold) | VS | 1.92 | 2 | 2.08 | V | 3 | |
| VCC 欠压保护门限 (UVLO threshold) | VUVLO | 3.3 | 3.5 | V | 3 | ||
| VS 内部延时触发电平 (VS internal delay trigger level) | Vssth | 2.5 | V | 3 | |||
| ZS 输出短路保护阈值 (ZS output short-circuit protection threshold) | Vzssth | 1.5 | V | 3 | |||
| VS 输出短路保护阈值 (VS output short-circuit protection threshold) | Vvssth | 0.15 | V | 连续 8 个周期 | 3 | ||
| 前沿消隐时间 (leading edge blanking time) | Tonmin | 1.3 | uS | 3 | |||
| 最小关断时间 (minimum off time) | Toffmin | 3 | uS | 3 | |||
| 电流采样门限 (current sense threshold) | VIS | 150 | mV | 3 | |||
| 短路保护关断时间 (short-circuit protection off time) | Tprotect | 1.5 | mS | 3 | |||
| 输出管导通阻抗 (output MOSFET on-resistance) | RDSon | 100 | mΩ | VCC=10V，ID=3A（脉冲测试） | 3 | ||
| 热关断温度 (thermal shutdown temperature) | TOFF | 140 | ℃ | 3 | |||
| 热关断迟滞 (thermal shutdown hysteresis) | THYS | 20 | ℃ | 3 |
CAD (KiCad official)
- Symbol:
MST2218KCD - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
mst2218kcd-etched.step/mst2218kcd-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mst2218kcd.step/mst2218kcd.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MST datasheet (6 pp, sha256
5b1df0375802a189, 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, primaryclaude-haiku-5-5(text), consensusclaude-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).
# MST2218KCD
**MST** · DC-DC Converters · SOIC-8
MST2218KCD from MST, in a SOIC-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 | IS | input | Source of the integrated power MOSFET; a sense resistor to GND sets the primary peak current (Ipeak = VIS/Rs, with the 150 mV current sampling threshold), and the Input (VS/ZS/IS) to GND absolute maximum is 5.3 V. |
| 2 | VCC | power_in | Supply pin for the chip, connected to the positive side of the input capacitor and the clamp resistor; the datasheet gives an undervoltage lockout of 3.3 to 3.5 V, an input clamp voltage of 10 to 16 V, and an absolute maximum of 15 V to GND. |
| 3 | VS | power_in | Voltage feedback input used to sense the output voltage, with a monitoring threshold of 1.92 to 2.08 V and an absolute maximum input of 5.3 V to GND. |
| 4 | ZS | input | Input of the zero-crossing comparator, with a short-circuit protection threshold of 1.5 V and an absolute maximum input of 5.3 V to GND. |
| 5 | GND | power_in | System ground, connected to the negative terminal of the input supply and to the negative sides of the input and output capacitors. |
| 6 | GND | power_in | Enlarged copper foil at this pin increases the heat dissipation capability of the control circuit; the datasheet gives no other electrical function for it. |
| 7 | SW | output | Drain of the integrated 100 V power MOSFET (absolute maximum 100 V to GND, RDSon 100 mΩ at VCC=10V, ID=3A); enlarged copper here improves MOSFET heat dissipation, and the snubber capacitor must keep SW below 70 V after turn-off. |
| 8 | SW | output | Second SW pin shown in the application circuit and package drawing as the power MOSFET drain; the pin table row gives no name or description for it. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MST |
| Package | SOIC-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 to GND (note 1) | | -0.3 | | 15 | V | | 2 |
| SW to GND | | -0.3 | | 100 | V | | 2 |
| Input (VS\ZS\IS) to GND | | -0.3 | | 5.3 | V | | 2 |
| IS peak current | | | | 4 | A | | 2 |
| 工作环境温度 (operating ambient temperature) | | -40 | | 85 | ℃ | | 2 |
| 存储温度 (storage temperature) | | -40 | | 150 | ℃ | | 2 |
| 封装热阻 SOP8 (package thermal resistance) | | | | 90 | ℃/W | SOP8 | 2 |
| 封装最大功耗 SOP8 (max package power dissipation) | Pdmax | | | 800 | mW | SOP8 | 2 |
| 人体模式 HBM (ESD) | | | | 4 | kV | | 2 |
| Latch-up | | | | 200 | mA | | 2 |
| 工作电压范围 (operating voltage range) | VIN | 4.5 | 14 | | V | | 3 |
| 输入钳位电压 (input clamp voltage) | VCCCLAMP | 10 | 13 | 16 | V | | 3 |
| 输入钳位电流 (input clamp current) | ICLAMP | 30 | | | mA | VCC=15V | 3 |
| 工作电流 (operating current) | ICC | | | 500 | uA | VCC=8V, 工作频率 100kHz | 3 |
| 电压监测阈值 (voltage monitor threshold) | VS | 1.92 | 2 | 2.08 | V | | 3 |
| VCC 欠压保护门限 (UVLO threshold) | VUVLO | 3.3 | | 3.5 | V | | 3 |
| VS 内部延时触发电平 (VS internal delay trigger level) | Vssth | | 2.5 | | V | | 3 |
| ZS 输出短路保护阈值 (ZS output short-circuit protection threshold) | Vzssth | | 1.5 | | V | | 3 |
| VS 输出短路保护阈值 (VS output short-circuit protection threshold) | Vvssth | | 0.15 | | V | 连续 8 个周期 | 3 |
| 前沿消隐时间 (leading edge blanking time) | Tonmin | | 1.3 | | uS | | 3 |
| 最小关断时间 (minimum off time) | Toffmin | | 3 | | uS | | 3 |
| 电流采样门限 (current sense threshold) | VIS | | 150 | | mV | | 3 |
| 短路保护关断时间 (short-circuit protection off time) | Tprotect | | 1.5 | | mS | | 3 |
| 输出管导通阻抗 (output MOSFET on-resistance) | RDSon | | 100 | | mΩ | VCC=10V，ID=3A（脉冲测试） | 3 |
| 热关断温度 (thermal shutdown temperature) | TOFF | | 140 | | ℃ | | 3 |
| 热关断迟滞 (thermal shutdown hysteresis) | THYS | | 20 | | ℃ | | 3 |
## CAD (KiCad official)
- Symbol: `MST2218KCD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `mst2218kcd-etched.step` / `mst2218kcd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mst2218kcd.step` / `mst2218kcd.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/8588881761904705536) (6 pp, sha256 `5b1df0375802a189`, 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/mst2218kcd-datasheet.pdf)