# CTM8251KAT

**VISOM** · CAN Bus Modules · DIP-7

CTM8251KAT from VISOM, in a DIP-7. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | power_in | Positive power supply input. 3.3VDC nominal (3.15-3.45V range) for the CTM8251KAT variant. Typical quiescent current 46 mA; maximum operating current 130 mA. Absolute maximum -0.7V to +5V. |
| 2 | GND | power_in | Logic-side ground (power input return). Reference for VCC, TXD, and RXD. Galvanically isolated from the CAN-bus-side ground (CANG). |
| 3 | TXD | input | CAN controller transmit-data input from the host MCU/CAN controller. 3.3V-compatible logic (VIH >= 0.7·VCC, VIL <= 0.3·VCC). Drive current 2 mA typical. Dominant-timeout Tto(dom) = 0.3-12 ms (1 ms typ). |
| 4 | RXD | output | CAN controller receive-data output to the host MCU/CAN controller. 3.3V push-pull logic level (VOH >= VCC-0.4, VOL <= 0.4V at IRXD=4 mA). Output current up to 10 mA. |
| 6 | CANH | bidirectional | CAN bus high line, ISO 11898-2 differential output/input. Dominant level 2.75-4.5V (3.5V typ); recessive level 2-3V (2.5V typ). Bus pin withstand voltage ±36V DC, transient ±100V. |
| 7 | CANL | bidirectional | CAN bus low line, ISO 11898-2 differential output/input. Dominant level 0.5-2.25V (1.5V typ); recessive level 2-3V (2.5V typ). Bus pin withstand voltage ±36V DC, transient ±100V. |
| 8 | CANG | power_out | Isolated (bus-side) power supply ground reference for the CAN-bus side of the module. Optional connection point for cable shield (single-point earth) in shielded twisted-pair installations. May be left floating if unused. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | VISOM |
| Package | DIP-7 |
| Category | IoT/Communication Modules |
| Pins | 7 |

## Ordering variants

Same part, different packaging or reel option.

- `CTM8251KAT`
- `CTM8251KT`

## CAD (KiCad official)

- Symbol: `CTM8251KAT`
- Footprint: `Package_DIP:DIP-8-N6_W7.62mm`
- 3D model: DIP-7 (KiCad packages3D, STEP)
- 3D model files: `ctm8251kat-etched.step` / `ctm8251kat-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ctm8251kat.step` / `ctm8251kat.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [VISOM datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588895596661260288) (5 pp, sha256 `9a3b28d0dd28f73c`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ctm8251kat-datasheet.pdf)