NXP Semiconductors TJA1042T/3/1J

Overview

TJA1042T/3/1J from NXP Semiconductors is a high-speed CAN transceiver with Standby mode, implementing ISO 11898-2:2016 and SAE J2284-1 to -5 for CAN FD fast-phase operation up to 5 Mbit/s. It features VIO pin support for direct interfacing with 3.3 V microcontrollers, 10 μA Standby current, ±58 V bus fault protection, and AEC-Q100 qualification for automotive use in 12 V/24 V systems.

For engineers reviewing the TJA1042T/3/1J datasheet, TJA1042T/3/1J pinout, TJA1042T/3/1J application, or TJA1042T/3/1J equivalent, key selection criteria include VIO-supplied I/O level compatibility, bus wake-up timing (t_{fltr(wake)bus} = 0.5–5 μs), differential receiver threshold (0.4–1.15 V), and SO8 package mechanical fit in space-constrained ECUs.

Technical Context

The TJA1042T/3/1J operates in Normal and Standby modes controlled by the STB pin: Normal mode enables full-duplex CAN FD communication with <250 ns TXD-to-RXD propagation delay, while Standby mode disables transmitter and main receiver blocks, retaining only a low-power wake-up detector powered by VIO. Its differential receiver includes hysteresis (50–200 mV) and undervoltage detection on both VCC (3.5–4.5 V) and VIO (1.3–2.7 V).

It integrates fail-safe functions including TXD dominant time-out (0.3–5 ms), bus dominant time-out in Standby (0.3–5 ms), and overtemperature shutdown at 190 °C. The VIO pin directly supplies the I/O level adapter and low-power receiver, enabling wake-up monitoring even when VCC is unpowered-critical for ultra-low-power vehicle body control modules.

Key Specifications

Pinout & Package

Package: SO8 (SOT96-1), plastic small outline, 8 leads, 3.9 mm body width, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CAN transceiver applications.

Compared with TCAN1042HDRBR and TJA1057T/3, the TJA1042T/3/1J uniquely balances VIO-based 3.3 V MCU compatibility, ultra-low Standby current, and AEC-Q100 Grade 0 qualification in a standard SO8 package-making it optimal for next-generation automotive ECUs requiring flexible voltage domains and extended battery-off endurance.

Availability

TJA1042T/3/1J is available at Aetrix Electronics and suitable for automotive body control, ADAS domain controllers, powertrain ECUs, and EV battery management systems requiring stable component supply across long product lifecycles.

Supply support for TJA1042T/3/1J includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade analog and mixed-signal ICs.

The TJA1042 series belongs to NXP's third-generation high-speed CAN transceiver family, designed specifically for automotive HS-CAN networks requiring low-power Standby operation, bus wake-up, and compliance with ISO 11898-2:2016 and SAE J2284 standards.

FAQ

What is the function of the VIO pin on the TJA1042T/3/1J?

The VIO pin on the TJA1042T/3/1J supplies the I/O level adapter and low-power wake-up receiver, enabling direct interfacing with 3.3 V microcontrollers and allowing bus activity monitoring even when VCC is unpowered. It sets TXD, RXD, and STB logic thresholds to match the MCU's supply, eliminating external level shifters. VIO operates from 2.8 V to 5.5 V and includes undervoltage detection (1.3–2.7 V) that disengages the transceiver from the bus if violated. This functionality is confirmed in Table 3 and Section 7.3.2 of the official datasheet.

Does the TJA1042T/3/1J support CAN FD operation at 5 Mbit/s?

Yes, the TJA1042T/3/1J fully supports CAN FD fast-phase operation up to 5 Mbit/s as specified in ISO 11898-2:2016 and SAE J2284-1 to -5. Its timing parameters-including td(TXD-busdom) ≤ 100 ns and td(busrec-RXD) ≤ 155 ns-are guaranteed across the full operating temperature range (−40 °C to +150 °C) and supply conditions. These characteristics enable reliable high-speed communication in modern automotive networks such as ADAS and domain controllers, where low latency and deterministic timing are critical for the TJA1042T/3/1J.

How does the Standby mode wake-up mechanism work on the TJA1042T/3/1J?

In Standby mode, the TJA1042T/3/1J disables its main transmitter and receiver but keeps a low-power differential receiver active, powered solely by VIO. This receiver monitors CANH/CANL for dominant states lasting longer than t_{fltr(wake)bus} (0.5–5 μs), then asserts LOW on RXD to signal wake-up. The host MCU must then drive STB LOW to exit Standby. This design ensures minimal current draw (5–14 μA) while maintaining responsiveness to valid bus traffic-essential for battery-sensitive automotive modules using the TJA1042T/3/1J.

What protection features does the TJA1042T/3/1J include against automotive electrical threats?

The TJA1042T/3/1J includes ±58 V bus fault protection on CANH/CANL, ±8 kV HBM ESD immunity, undervoltage detection on VCC (3.5–4.5 V) and VIO (1.3–2.7 V), TXD dominant time-out (0.3–5 ms), bus dominant time-out in Standby (0.3–5 ms), and thermal shutdown at 190 °C. These protections are validated per AEC-Q100 Rev-G and automotive transient standards (ISO 7637, IEC 62228-3), ensuring robust operation during load dump, jump-start, and ESD events-key reliability requirements for the TJA1042T/3/1J in production vehicles.

Is the TJA1042T/3/1J pin-compatible with legacy CAN transceivers like the PCA82C251?

No, the TJA1042T/3/1J is not pin-compatible with the PCA82C251. While it provides functional backward compatibility in system behavior (e.g., same bus signaling and protocol support), its pinout differs: PCA82C251 uses RXD on pin 4 and TXD on pin 1, but the TJA1042T/3/1J places VIO on pin 5 instead of SPLIT (as in TJA1042T) or NC. Migration requires PCB layout revision. However, the TJA1042T/3/1J is pin-compatible with other TJA1042 variants in SO8 package (e.g., TJA1042T/3), making it a drop-in replacement within the same family.