TJA1051 CAN Transceiver

@@ -0,0 +1,53 @@+# TJA1051++**NXP** · CAN Transceiver · SOIC-8++The TJA1051 is a high-speed CAN transceiver that connects a CAN protocol controller to the physical two-wire bus. It converts the controller's TX/RX logic signals to the differential CANH/CANL bus levels and back, with bus fault protection and low electromagnetic emission. It supports classic CAN and CAN FD data rates up to 5 Mbit/s.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | TXD | input | CAN transmit data input from the controller. A LOW level drives the CAN bus to the dominant state; a HIGH level allows the bus to be recessive. Has an internal pull-up to VIO so a floating TXD defaults to recessive. A 'TXD dominant time-out' timer disables the transmitter if TXD stays LOW longer than t_to(dom)TXD, setting a minimum bus rate of ~20 kbit/s. |+| 2 | GND | power_in | Device ground, 0 V reference for all signals. On the HVSON8 (TJA1051TK/3) variant the die supply ground is bonded to both the GND pin and the exposed center pad; both must be soldered to board ground for correct and enhanced thermal operation. |+| 3 | VCC | power_in | Main transceiver supply voltage, 4.5 V to 5.5 V (typ. 5 V). Feeds the CAN bus driver stage. Undervoltage detection at V_uvd(VCC) = 3.5 to 4.5 V disengages the transceiver from the bus (zero load) until VCC recovers. |+| 4 | RXD | output | CAN receive data output; reproduces the logical state of the CAN bus for the controller. LOW when the bus is dominant, HIGH when recessive. Push-pull output referenced to VIO (or VCC on parts without a VIO pin); floats in Off mode on the TJA1051T/E. |+| 5 | NC/EN/VIO | unconnected | Pin 5 function is set by the ordering variant. TJA1051T: not connected (n.c.). TJA1051T/E: EN, active-HIGH enable control input (LOW = Off mode, bus and RXD float); internal pull-down to GND. TJA1051T/3 and TJA1051TK/3: VIO, I/O level-adapter supply (2.8 V to 5.5 V) that sets the logic levels of TXD, RXD and S so the device can interface directly with 3 V-5 V microcontrollers. |+| 6 | CANL | bidirectional | LOW-level CAN bus line. Together with CANH forms the differential ISO 11898-2 bus. Driven LOW in the dominant state and released toward Vcc/2 in the recessive state. Withstands −58 V to +58 V continuous bus voltage and ±8 kV IEC 61000-4-2 ESD. |+| 7 | CANH | bidirectional | HIGH-level CAN bus line. Driven HIGH in the dominant state and released toward Vcc/2 in the recessive state, forming the differential pair with CANL. Withstands −58 V to +58 V continuous bus voltage and ±8 kV IEC 61000-4-2 ESD. |+| 8 | S | input | Silent-mode control input. LOW selects Normal mode (transmitter active); HIGH selects Silent mode (transmitter disabled, bus released to recessive, receiver still active). Internal pull-down to GND so a floating S defaults to Normal mode. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | High-speed CAN transceiver |+| Data rate | Up to 5 Mbit/s (CAN FD) |+| Supply voltage | 4.5 V to 5.5 V |+| Bus pins | CANH / CANL (differential) |+| Standards | ISO 11898-2 |+| Features | TXD dominant timeout, thermal protection |+| Operating temperature | -40 C to 150 C |++## Ordering variants++- `TJA1051T`+- `TJA1051T/E`+- `TJA1051T/3`+- `TJA1051TK/3`++## CAD (KiCad official)++- Symbol: `tja1051.kicad_sym`+- Footprint: `tja1051.kicad_mod`+- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [NXP datasheet](https://www.nxp.com/docs/en/data-sheet/TJA1051.pdf) (25 pp, sha256 `6637cd500dda3c1c`, 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).++[Datasheet PDF](docs/tja1051-datasheet.pdf)

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