TJA1050
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NXP high-speed CAN transceiver, SO-8. Up to 1 Mb/s, differential bus, silent mode. The controller-to-bus interface. Datasheet-verified.
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markdownTJA1050
NXP Semiconductors · High-speed CAN transceiver · SO-8
The physical-layer interface between a CAN controller and the CAN bus, in SO-8, and one of the most widely used CAN transceivers. It converts the logic-level TXD/RXD of a controller (an MCP2515, or an MCU's on-chip CAN) into the differential CANH/CANL signals on the bus and back, at up to 1 Mb/s. An S (silent) pin disables the transmitter so a node can listen without driving the bus, and the device tolerates bus faults and provides good EMC. It drives a full multi-node bus and runs from a single 5 V supply. Vref outputs half-supply for reference.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | TXD | input | Transmit data input from the CAN controller to the bus line drivers. LOW drives the bus to dominant, HIGH (or floating) leaves the bus recessive. Internal pull-up (~200 uA) to VCC; VIH >= 2.0 V, VIL <= 0.8 V. TXD dominant time-out (250-750 us) forces the bus back to recessive if held LOW too long. |
| 2 | GND | power_in | Device ground. All voltages in the datasheet are referenced to this pin. |
| 3 | VCC | power_in | Supply voltage, 4.75 V to 5.25 V. Typical supply current is 50 mA dominant / 5 mA recessive. Bypass with 100 nF close to the pin. |
| 4 | RXD | output | Receive data output; forwards the differential bus state to the CAN controller. LOW = dominant, HIGH = recessive. Drive capability IOH = -6 mA typ. at VRXD = 0.7*VCC, IOL = 8.5 mA typ. at VRXD = 0.45 V. |
| 5 | Vref | output | Reference voltage output at 0.5VCC (0.45VCC to 0.55*VCC) for use as a stable mid-supply reference to the CAN controller. Load current limited to +/-50 uA. |
| 6 | CANL | bidirectional | LOW-level CAN bus line. Driven toward GND (typ. 1.4 V) in the dominant state and biased to 0.5*VCC in the recessive state through internal 25 kOhm. Protected against ISO 7637 automotive transients (-200 V to +200 V) and short-circuits to +/-27 V (up to +40 V absolute max). |
| 7 | CANH | bidirectional | HIGH-level CAN bus line. Driven toward VCC (typ. 3.6 V) in the dominant state and biased to 0.5*VCC in the recessive state through internal 25 kOhm. Protected against ISO 7637 automotive transients (-200 V to +200 V) and short-circuits to +/-27 V (up to +40 V absolute max). |
| 8 | S | input | Mode select input. Tie to GND for high-speed (normal) mode; tie to VCC for silent mode (transmitter disabled, receiver still operational). Weak internal pull-down (~30 uA); if left floating the device defaults to high-speed mode, but grounding S is recommended for best EMI. VIH >= 2.0 V (silent), VIL <= 0.8 V (high-speed). |
Key specifications
| Parameter | Value |
|---|---|
| Type | High-speed CAN transceiver |
| Bus speed | up to 1 Mb/s |
| Bus interface | CANH / CANL (differential) |
| Controller interface | TXD / RXD (logic level) |
| Modes | high-speed / silent (S pin) |
| Reference | Vref (0.5 x VCC) |
| Supply voltage | 4.75-5.25 V |
| Package | SO-8 |
Ordering variants
Same part, different packaging or reel option.
TJA1050T (SO-8)TJA1050T/CM (SO-8, tape & reel)
CAD (KiCad official)
- Symbol:
TJA1050 (generated from datasheet; KiCad has no symbol) - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D)
- 3D model files:
tja1050-etched.step/tja1050-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tja1050.step/tja1050.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: NXP Semiconductors datasheet (18 pp, sha256
f95c1ffa13e4d80e, retrieved 2026-08-17, tier: manufacturer) - 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).