# JSM900R

**JSMSEMI** · RF Transceiver ICs · SOP-8

JSM900R from JSMSEMI, 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; the datasheet advises grounding the metal base through as many vias as possible to reduce parasitic inductance. |
| 2 | ANT | input | RF signal input pin; the receiver specifies a saturated input level of -20 dBm with RSC = 50 Ω. |
| 3 | VDD | power_in | Power supply pin rated DC 2.0-5.5 V in the pin table (normal operating range 2.0-5.0 V), with a 0.1 µF bypass capacitor placed close to the device and a 47 Ω series resistor on the RF supply recommended for 5 V use. |
| 4 | NC | unconnected | Listed as NC (no connection) in the pin table with no function given. |
| 5 | DO | output | Demodulated data signal output. |
| 6 | SHUT | input | Operating mode select: connect to VDD for shutdown mode and to GND for operating mode. |
| 7 | SQ | input | Squelch select: leave floating or connect to the supply to enable squelch (which reduces sensitivity by about 3 dB), and connect to GND to disable it. |
| 8 | RO | input | External crystal connection (reference oscillator input); the datasheet also allows driving it with an external clock through a coupling capacitor at 0.3-0.7 V peak-to-peak. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SOP-8 |
| Category | RF And Wireless |
| 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 | V |  | 3 |
| 工作温度 (operating temperature) | TA | -40 |  | 125 | ℃ |  | 3 |
| 电源电压斜率 (supply ramp rate) | θ |  |  | 1 | mV/μs |  | 3 |
| 电源电压 (supply voltage, absolute max) | VDD | -0.3 |  | 5.5 | V |  | 3 |
| 接口电压 (interface voltage) | VIN | -0.3 |  |  | V |  | 3 |
| 储藏温度 (storage temperature) | TSTG | -65 |  | 150 | ℃ |  | 3 |
| 焊接温度 (soldering temperature) | TSDR |  |  | 245 | ℃ | 持续最多 30 秒 | 3 |
| ESD 等级 (HBM) | VHBM | -8 |  | 8 | kV | 人体模型（HBM） | 3 |
| 电源电压 (receiver spec) | VDD | 2 |  | 5 | V |  | 4 |
| 数据率 (data rate) | DR | 0.1 |  | 10 | kbps |  | 4 |
| 工作频率范围 (operating frequency range) | fRF |  | 315 |  | MHz | fRF=9.81563MHz | 4 |
| 工作频率范围 (operating frequency range) | fRF |  | 433.92 |  | MHz | fRF=13.52127MHz | 4 |
| 工作电流 (operating current) | IOP |  | 2.6 |  | mA | fRF=315MHz,VDD=3.3V | 4 |
| 工作电流 (operating current) | IOP |  | 2.68 |  | mA | fRF=315MHz,VDD=5V | 4 |
| 工作电流 (operating current) | IOP |  | 3.2 |  | mA | fRF=433.92MHz,VDD=3.3V | 4 |
| 工作电流 (operating current) | IOP |  | 3.36 |  | mA | fRF=433.92MHz,VDD=5V | 4 |
| 休眠电流 (standby current) | ISTBY |  | 0.1 |  | µA | VSHUT=VDD | 4 |
| 接收灵敏度 (receiver sensitivity) |  |  | -106 |  | dBm | fRF = 315MHz | 4 |
| 接收灵敏度 (receiver sensitivity) |  |  | -108 |  | dBm | fRF = 433.92MHz | 4 |
| 接收器带宽 (receiver bandwidth) | fBW |  | 250 |  | kHz | fRF = 315MHz | 4 |
| 接收器带宽 (receiver bandwidth) | fBW |  | 300 |  | kHz | fRF = 433.92MHz | 4 |
| 中频频率 (IF frequency) | fIF |  | 0.86 |  | MHz |  | 4 |
| 中频带宽 (IF bandwidth) | fBW |  | 0.43 |  | MHz |  | 4 |
| 饱和输入电平 (saturation input level) |  |  | -20 |  | dBm | RSC = 50Ω | 4 |
| Spurious Reverse Isolation |  |  | 30 |  | µVr/ms | ANT pin, RSC = 50Ω | 4 |
| Reference Oscillator Input Impedance | ZREFOSC |  | 290 |  | kΩ |  | 4 |
| Reference Oscillator Source Current |  |  | 5.2 |  | µA |  | 4 |
| 晶体振荡器频率 (crystal oscillator frequency) | fT |  | 9.81563 |  | MHz | fRF = 315MHz | 4 |
| 晶体振荡器频率 (crystal oscillator frequency) | fT |  | 13.5213 |  | MHz | fRF = 433.92MHz | 4 |
| 接收器启动时间 (receiver startup time) |  |  | 4 |  | ms | 从 VDD 上电到接收 | 4 |
| SHUT 启动时间 (SHUT startup time) |  |  | 3 |  | ms | 从 SHUT 引脚拉低到接收 | 4 |
| 晶体频率 (crystal frequency) | FXTAL315 |  | 9.81563 |  | MHz | FRF =315 MHz | 5 |
| 晶体频率 (crystal frequency) | FXTAL433.92 |  | 13.5213 |  | MHz | FRF =433.92 MHz | 5 |
| 晶体频率精度 (crystal frequency accuracy) |  | -20 |  | 20 | ppm |  | 5 |
| 负载电容 (load capacitance) | CLOAD |  | 20 |  | pF |  | 5 |
| 晶体等效电阻 (crystal equivalent resistance) | Rm |  | 60 |  | Ω |  | 5 |
| 晶体启动时间 (crystal startup time) | tXTAL |  | 400 |  | µs |  | 5 |

## CAD (KiCad official)

- Symbol: `JSM900R`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `jsm900r-etched.step` / `jsm900r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jsm900r.step` / `jsm900r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588945022817882112) (6 pp, sha256 `1a5e74ae27fe65a0`, retrieved 2026-10-16, 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/jsm900r-datasheet.pdf)