# HX2551-S

**ZHHXDZ** · CAN Transceivers · SOP-8

HX2551-S from ZHHXDZ, 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 | TXD | input | Transmit data input from the CAN controller, with a VIH of 2V to VCC+0.3V and a VIL of -0.3V to 0.8V, and an internal pull-up to VCC that keeps the bus recessive when TXD is unpowered. |
| 2 | GND | power_in | Ground supply pin for the transceiver. |
| 3 | VCC | power_in | Supply voltage pin, operating at VCC = 5V ±10% (4.5V to 5.5V absolute maximum range). |
| 4 | RXD | output | Receive data output that reads out data from the bus lines to the CAN controller, with a VOH of 4V minimum and a VOL of 0.4V maximum at the stated test currents. |
| 5 | Vref | power_in | Common-mode stabilization output that holds the bus common-mode voltage between 0.3VCC and 0.7VCC for loads up to ±500µA. |
| 6 | CANL | bidirectional | LOW-level CAN bus line, rated for bus-side voltages from -60V to +60V and transient voltages of ±200V. |
| 7 | CANH | bidirectional | HIGH-level CAN bus line, rated for bus-side voltages from -60V to +60V and transient voltages of ±200V. |
| 8 | Rs | input | High-speed and standby mode selection pin, where low selects high-speed mode, and the MCU-side port is limited to -0.3V to VCC+0.3V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ZHHXDZ |
| Package | SOP-8 |
| Category | Communication Interface Chip |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `HX2551-S`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `hx2551-s-etched.step` / `hx2551-s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hx2551-s.step` / `hx2551-s.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ZHHXDZ datasheet](docs/hx2551-s-datasheet.pdf) (8 pp, sha256 `34fe483a4aa6eaae`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/hx2551-s-datasheet.pdf)