# CMT2210LC-ESR2

**HopeRF Micro electronics** · RF Transceiver ICs · SOP-8

CMT2210LC-ESR2 from HopeRF Micro electronics, 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 reference pin for the receiver. |
| 2 | VDD | power_in | Power supply input; operating supply range is 1.8 to 3.6 V, with a supply slope of no more than 1 mV/us. |
| 3 | DOUT | output | Demodulated OOK receive data output to the external MCU. |
| 4 | SDN | input | Chip shutdown control input: pulling low enables receiver operation and pulling high turns the receiver off. |
| 5 | XIN | input | Crystal oscillator input, or external reference clock input through a DC-blocking capacitor; external clock amplitude should be 0.3 to 0.7 V peak-to-peak at the XTAL pin. |
| 6 | NC | unconnected | No connection; leave floating. |
| 7 | NC | unconnected | No connection; leave floating. |
| 8 | RFIN | input | RF signal input to the chip's LNA; the LNA input is matched to 50 Ω or other antenna types with one inductor and one capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HopeRF Micro electronics |
| 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 |
|---|---|---|---|---|---|---|---|
| Operating supply voltage | VDD | 1.8 |  | 3.6 | V |  | 5 |
| Operating temperature | TOP | -40 |  | 85 | °C |  | 5 |
| Supply voltage | VDD | -0.3 |  | 3.6 | V |  | 5 |
| Interface voltage | VIN | -0.3 |  |  | V | max printed as VDD + 0.3 V | 5 |
| Junction temperature | TJ | -40 |  | 125 | °C |  | 5 |
| Storage temperature | TSTG | -50 |  | 150 | °C |  | 5 |
| Soldering temperature | TSDR |  |  | 255 | °C | duration at least 30 s | 5 |
| ESD HBM rating | ESD | -2 |  | 2 | kV | human body model (HBM) | 5 |
| Latch-up current |  | -100 |  | 100 | mA | @ 85 °C | 5 |
| Data rate | DR | 1 |  | 5 | kbps |  | 6 |
| Maximum input signal (saturation input level) | PLVL |  |  | 10 | dBm |  | 6 |
| Blocking immunity, ±1 MHz CW interference | BI |  | 26 |  | dB | ±1 MHz, continuous-wave interference | 6 |
| Blocking immunity, ±2 MHz CW interference | BI |  | 37 |  | dB | ±2 MHz, continuous-wave interference | 6 |
| Blocking immunity, ±10 MHz CW interference | BI |  | 65 |  | dB | ±10 MHz, continuous-wave interference | 6 |
| Input third-order intercept point | IIP3 |  | -23 |  | dBm | two-tone test at 1 MHz and 2 MHz offset, maximum system gain setting | 6 |
| Sensitivity at 315 MHz | S315 |  | -109 |  | dBm | FRF = 315 MHz, DR = 3 kbps, BER = 0.1% | 6 |
| Sensitivity at 433.92 MHz | S433.92 |  | -109 |  | dBm | FRF = 433.92 MHz, DR = 3 kbps, BER = 0.1% | 6 |
| Operating current at 315 MHz | IDD315 |  | 3.3 |  | mA | FRF = 315 MHz | 6 |
| Operating current at 433.92 MHz | IDD433.92 |  | 3.8 |  | mA | FRF = 433.92 MHz | 6 |
| Sleep (shutdown) current | ISHUTDOWN |  | 60 |  | nA |  | 6 |
| Receiver bandwidth at 315 MHz | BW315 |  | 240 |  | kHz | FRF = 315 MHz | 6 |
| Receiver bandwidth at 433.92 MHz | BW433.92 |  | 330 |  | kHz | FRF = 433.92 MHz | 6 |
| Frequency synthesizer lock time | TLOCK |  | 150 |  | us | from XOSC stable start | 6 |
| Receiver start-up time | TSTART-UP |  | 3 |  | ms | from power-up to reception | 6 |
| Crystal frequency at 315 MHz | FXTAL315 |  | 19.7008 |  | MHz | FRF = 315 MHz | 6 |
| Crystal frequency at 433.92 MHz | FXTAL433.92 |  | 27.1383 |  | MHz | FRF = 433.92 MHz | 6 |
| Crystal frequency accuracy |  | -20 |  | 20 | ppm | includes initial error, crystal load, aging and temperature variation | 6 |
| Crystal load capacitance | CLOAD |  | 15 |  | pF |  | 6 |
| Crystal equivalent series resistance | Rm |  |  | 60 | Ω |  | 6 |
| Crystal start-up time | tXTAL |  | 400 |  | us | largely dependent on the crystal | 6 |

## CAD (KiCad official)

- Symbol: `CMT2210LC-ESR2`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `cmt2210lc-esr2-etched.step` / `cmt2210lc-esr2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cmt2210lc-esr2.step` / `cmt2210lc-esr2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HopeRF Micro electronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586197060152397824) (18 pp, sha256 `4ab7e49e70be802b`, 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/cmt2210lc-esr2-datasheet.pdf)