# SY8120B

**Slkor(SLKORMICRO Elec.)** · DC-DC Converters · SOT-23-6

SY8120B from Slkor(SLKORMICRO Elec.), in a SOT-23-6. 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 | BS | passive | Boot-strap pin supplying the high-side gate driver; decouple to the LX pin with a 0.01uF ceramic capacitor. |
| 2 | GND | power_in | Ground. |
| 3 | FB | input | Output feedback pin; connect to the center of the output resistor divider to set Vout=0.6*(1+R1/R2), with 0.6V reference. |
| 4 | EN | input | Enable pin; high input (min 1.5V) enables the device, low input (max 0.4V) disables it, do not float. |
| 5 | IN | power_in | Input supply pin, operating range 4V to 18V (recommended 4 to 16V), with a bypass ceramic capacitor placed very close. |
| 6 | LX | output | Inductor pin; connect to the switching node of the inductor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Slkor(SLKORMICRO Elec.) |
| Package | SOT-23-6 |
| Category | Power Supply Chip |
| Pins | 6 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| FB Pin Voltage | VFB | 588 | 600 | 612 | mV | VIN=VEN=3.6V, TA=25C | 2 |
| Input Voltage | VIN | 4 |  | 16 | V |  | 2 |
| Operating Current (Shutdown) | Ioff |  | 1 | 5 | µA | EN=0V | 2 |
| Quiescent current | Iqc |  |  | 200 | µA | Iout=0, Vfb=VREF+5% | 2 |
| Switching Frequency | Fsw |  | 600 |  | KHz | Iout=200mA | 2 |
| Maximum Duty Cycle | Dmax |  | 90 |  | % | VFB=0V | 2 |
| EN Minimum High Level | VEN_H |  | 1.5 |  | V |  | 2 |
| EN Maximum Low Level | VEN_L |  | 0.4 |  | V |  | 2 |
| Input UVLO threshold | Vuvlo |  | 3.9 |  | V |  | 2 |
| SW On Resistance (TOP FET) | RON(1) |  | 0.11 |  | Ω |  | 2 |
| SW On Resistance (Bottom FET) | RON(2) |  | 0.09 |  | Ω |  | 2 |
| TOP FET Current Limit | T-CL |  | 2.5 |  | A |  | 2 |
| Input Voltage (abs max) | VIN | 4 |  | 18 | V | printed as 4～18.0 V | 2 |
| Voltage at SW Pin | VSW | -0.5 |  | 18 | V |  | 2 |
| Power Dissipation | PDMAX |  |  | 0.4 | W |  | 2 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 2 |
| Package Lead Soldering Temperature | Tsolder |  |  | 260 | ℃ | 10s | 2 |
| ESD Susceptibility HBM | HBM |  |  | 2 | kV | human body mode | 2 |
| ESD Machine Mode | MM |  |  | 200 | V |  | 2 |
| VIN Supply Voltage | VIN | 4 |  | 16 | V |  | 2 |
| Operating Temperature | TOSS | -40 |  | 85 | ℃ |  | 2 |
| Thermal Resistance SOT-23-6 | ΘJA |  | 220 |  | ℃/W | SOT-23-6 | 2 |

## CAD (KiCad official)

- Symbol: `SY8120B`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `sy8120b-etched.step` / `sy8120b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sy8120b.step` / `sy8120b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Slkor(SLKORMICRO Elec.) datasheet](docs/sy8120b-datasheet.pdf) (6 pp, sha256 `8529096e76969e28`, retrieved 2026-10-23, tier: lcsc)
- **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/sy8120b-datasheet.pdf)