# WF490RE VD S8T&R

**WF** · RF Transceiver ICs · SOP-8

WF490RE VD S8T&R from WF, 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 | GND | power_in | Ground pin of the receiver (接地管脚). |
| 2 | ANT | input | RF signal input pin for the antenna. |
| 3 | VDD | power_in | Supply pin; the datasheet specifies DC 2.0 V to 5.5 V, with absolute maximum VDD of -0.3 V to 5.5 V. |
| 4 | CTH | input | Selects the reference signal mode for the internal data comparator; the CTH source impedance is 145 kΩ. |
| 5 | DO | output | Demodulated data signal output. |
| 6 | SHUT | input | Shutdown control: connect to VDD for shutdown mode and to GND for operating mode. |
| 7 | NC | unconnected | Not connected; leave floating. |
| 8 | REFOSC | input | External crystal connection pin; it can also be driven by an external clock through a coupling capacitor, with a peak-to-peak amplitude of 0.3 V to 0.7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WF |
| Package | SOP-8 |
| Category | Radio Frequency Chip/Antenna |
| 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 |
|---|---|---|---|---|---|---|---|
| 电源电压 (supply voltage, recommended) | VDD | 2 | 3.3 | 5.5 | V |  | 3 |
| 工作温度 (operating temperature) | TA | -40 |  | 125 | ℃ |  | 3 |
| 外部参考时钟峰峰值 (external clock drive on REFOSC) |  | 0.3 |  | 0.7 | V | 外部时钟经耦合电容驱动 REFOSC 管脚, 峰峰值 | 5 |
| 电源电压 (absolute maximum) | VDD | -0.3 |  | 5.5 | V |  | 3 |
| 接口电压 (interface voltage) | VIN | -0.3 |  |  | V |  | 3 |
| 结温 (junction temperature) | TJ | -40 |  | 150 | ℃ |  | 3 |
| 储藏温度 (storage temperature) | TSTG | -65 |  | 150 | ℃ |  | 3 |
| ESD等级 (ESD HBM) | VHBM | -8 |  | 8 | kV | 人体模型(HBM) | 3 |
| 电源电压 (receiver spec) | VDD | 2 |  | 5.5 | V |  | 4 |
| 数据率 (data rate) | DR |  |  | 10 | kbps |  | 4 |
| CTH 漏电流 (CTH leakage current) | IZCTH(leak) | -100 |  | 100 | nA | TA = +85°C | 4 |
| 晶体频率精度 (crystal frequency accuracy) |  | -20 |  | 20 | ppm |  | 5 |

## CAD (KiCad official)

- Symbol: `WF490RE VD S8T&R`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `wf490re-vd-s8t-r-etched.step` / `wf490re-vd-s8t-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wf490re-vd-s8t-r.step` / `wf490re-vd-s8t-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WF datasheet](docs/wf490re-vd-s8t-r-datasheet.pdf) (6 pp, sha256 `2cbcabd2dadac3cb`, retrieved 2026-10-21, 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/wf490re-vd-s8t-r-datasheet.pdf)