TJA1042T-JSM

@@ -0,0 +1,50 @@+# TJA1042T-JSM++**JSMSEMI** · CAN Transceivers · SOP-8++TJA1042T-JSM from JSMSEMI, in a SOP-8. 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 | TXD | input | CAN transmit data input from the protocol controller. LOW drives the bus to the dominant state; HIGH allows the bus to be recessive. Integrated pull-up to VCC; TXD dominant time-out prevents permanent bus blocking. |+| 2 | GND | power_in | Ground reference for the transceiver. Must be tied to board ground. |+| 3 | VCC | power_in | Transceiver 5 V supply voltage. Recommended operating range 4.5 V to 5.5 V; absolute max 7 V. Bypass with a local decoupling capacitor to GND. |+| 4 | RXD | output | CAN receive data output to the protocol controller. LOW indicates a dominant bus state, HIGH indicates recessive. Push-pull CMOS output rated ±2 mA (max ±8 mA absolute). |+| 5 | NC | unconnected | No Connect on the TJA1042T variant (this SOP-8 device has no VIO level-shifting supply). Leave floating or tie to GND. In the /3 variant this same pin becomes VIO. |+| 6 | CANL | bidirectional | Low-level CAN bus line (analog I/O). Together with CANH forms the differential CAN pair. Rated ±70 V bus fault tolerance; ±8 kV HBM / ±15 kV CDM / ±8 kV IEC 61000-4-2 contact ESD. |+| 7 | CANH | bidirectional | High-level CAN bus line (analog I/O). Together with CANL forms the differential CAN pair. Rated ±70 V bus fault tolerance; ±8 kV HBM / ±15 kV CDM / ±8 kV IEC 61000-4-2 contact ESD. |+| 8 | STB | input | Standby mode control input (active HIGH). LOW selects Normal mode with the CAN driver active; HIGH selects low-power Standby mode with bus wake-up capability. Integrated pull-up biases the device to Standby if left floating. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | JSMSEMI |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `TJA1042T-JSM`+- `TJA1042T-JSMTJA1042TK-JSM`+- `TJA1042T-JSMTJA1042T/3-JSM`+- `TJA1042T-JSMTJA1042TK/3-JSM`++## CAD (KiCad official)++- Symbol: `TJA1042T-JSM`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [JSMSEMI datasheet](docs/tja1042t-jsm-datasheet.pdf) (21 pp, sha256 `f2a20feb72d97c3a`, retrieved 2026-08-17, tier: lcsc)+- **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/tja1042t-jsm-datasheet.pdf)

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