NXP Semiconductors TJA1021T/10/C,118

Overview

TJA1021T/10/C,118 from NXP Semiconductors is an ISO 17987/LIN 2.x/SAE J2602-compliant automotive transceiver for Local Interconnect Network physical layer interfacing. It operates at baud rates up to 10.4 kBd, features integrated 30 kΩ LIN responder termination, supports remote/local wake-up detection, and delivers <10 μA sleep current. It serves as the bus interface between microcontroller LIN protocol controllers and the single-wire LIN bus in vehicle sub-networks such as door modules and seat control units.

For engineers reviewing the TJA1021T/10/C,118 datasheet, TJA1021T/10/C,118 pinout, TJA1021T/10/C,118 application, or TJA1021T/10/C,118 equivalent, this page provides verified functional specifications, SO8 package layout, low-slope waveform compliance with SAE J2602, wake-up source flag behavior on TXD, and validated alternatives for LIN 2.x subsystem design.

Technical Context

The TJA1021T/10/C,118 implements a LIN physical layer compliant with ISO 17987-4:2016 (12 V), LIN 2.0–2.2A, and SAE J2602, using low-slope output drive optimized for 10.4 kBd operation. Its receiver incorporates supply-voltage–referenced thresholds with hysteresis and integrated noise filtering, while the transmitter applies wave shaping to minimize electromagnetic emission (EME).

It supports four operating modes-Power-on, Normal, Standby, and Sleep-with automatic transition from Sleep to Standby upon wake-up events. Wake-up source recognition distinguishes local (WAKE_N edge-triggered) from remote (LIN dominant-state–triggered) events via TXD pull-down strength, and INH activation enables external regulator control during wake-up sequences.

Key Specifications

Pinout & Package

Package: SO8 (SOT96-1), 3.9 mm body width, leaded plastic small outline package compatible with standard reflow and AOI inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TJA1021T/10/C,118, the TJA1021T/20/C,118 enables faster diagnostics but increases EME risk, while the MCP2021-E/SN reduces integration level and requires board-level changes to support wake-up source identification and termination.

Availability

TJA1021T/10/C,118 is available at Aetrix Electronics and suitable for automotive door modules, seat control units, roof consoles, and climate actuator subsystems requiring stable component supply across production lifecycles.

Supply support for TJA1021T/10/C,118 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 networking and functional safety.

The TJA1021 series was designed specifically for cost-sensitive, high-reliability LIN sub-networks in vehicles, emphasizing low EME, robust wake-up handling, and seamless integration with 3.3 V/5 V microcontrollers.

FAQ

What LIN protocol versions does the TJA1021T/10/C,118 support?

The TJA1021T/10/C,118 supports LIN 2.0, LIN 2.1, LIN 2.2, and LIN 2.2A, as well as ISO 17987-4:2016 (12 V) and SAE J2602. It is backward-compatible with earlier LIN physical layers, enabling interoperability with legacy nodes. The TJA1021T/10/C,118 variant is specifically tuned for SAE J2602's 10.4 kBd requirement, distinguishing it from 20 kBd variants like TJA1021T/20/C,118.

How does wake-up source recognition work on the TJA1021T/10/C,118?

The TJA1021T/10/C,118 signals wake-up origin via TXD pin behavior in Standby mode: a weak pull-down indicates remote wake-up (LIN bus dominant), while a strong pull-down indicates local wake-up (WAKE_N edge). This allows the MCU to distinguish sources without additional pins. The TJA1021T/10/C,118 requires SLP_N to remain LOW during Standby and a subsequent HIGH edge to reset the flag and enter Normal mode.

Does the TJA1021T/10/C,118 include internal LIN bus termination?

Yes, the TJA1021T/10/C,118 integrates a 30 kΩ responder termination resistor between LIN and VBAT pins, eliminating the need for an external resistor in responder applications. This termination is automatically disabled in Sleep mode to minimize leakage current. For commander applications, an external diode-resistor network must still be added between INH or VBAT and LIN, as specified in the TJA1021T/10/C,118 datasheet.

What protection features does the TJA1021T/10/C,118 provide against automotive electrical stress?

The TJA1021T/10/C,118 provides ±6 kV HBM ESD protection on LIN/VBAT/WAKE_N, short-circuit protection on LIN to VBAT and GND, thermal shutdown at 150–200 °C, and VBAT undervoltage lockout below ~4.4 V. It also includes TXD dominant time-out to prevent bus lockup and passive behavior when unpowered - ensuring no reverse current flows into the LIN bus during power loss. These features meet ISO 7637 and AEC-Q100 requirements.

Can the TJA1021T/10/C,118 operate with both 3.3 V and 5 V microcontrollers?

Yes, the TJA1021T/10/C,118 accepts 3.3 V and 5 V logic levels on TXD, SLP_N, and WAKE_N inputs, with VIH minimum of 2 V and VIL maximum of +0.8 V. Its RXD output is open-drain and compatible with either voltage domain when pulled up externally. This dual-voltage compatibility simplifies integration with mixed-signal automotive ECUs and avoids level-shifter components in the TJA1021T/10/C,118 signal path.