TJA1049 - High-Speed CAN Transceiver with Standby | NXP
料号： TJA1049 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.2 | $1.20 |
| 10 | $1.05 | $10.50 |
| 100 | $0.88 | $88.00 |
| 500 | $0.74 | $370.00 |
| 1,000 | $0.62 | $620.00 |
| 2,500 | $0.55 | $1,375.00 |
TJA1049 概述
A CAN transceiver is the physical-layer silicon that converts the digital transmit/receive logic of a microcontroller's CAN protocol controller into the balanced differential voltage signaling required on the bus. The TJA1049 belongs to the high-speed CAN (ISO 11898-2) family, which sits hierarchically under the broader CAN protocol stack: physical layer transceiver -> CAN protocol controller -> higher-layer software (CANopen, J1939, AUTOSAR, etc.). It is the third-generation NXP HS-CAN transceiver, succeeding TJA1040 (first) and TJA1050 (second).
Key features of the TJA1049 include: low-current standby mode with bus wake-up via CAN signaling; a Transmit Data (TXD) dominant-time-out to prevent bus lock-up if the controller fails; thermal shutdown protection; an SPLIT pin (HVSON variant) to stabilize the bus common-mode voltage when the network is not terminated; and ±8 kV HBM ESD protection on bus pins CANH and CANL (per IEC 61000-4-2). The supply voltage is 4.5 V to 5.5 V.
Architecturally, the TJA1049 uses a low-dropout voltage regulator on VCC to power internal logic, a differential driver stage that sources/sinks bus current during dominant bits, and a differential receiver with high common-mode range for recessive bits. The standby current is typically below 15 µA, which is critical for automotive body controllers and ECUs that must wake on CAN activity without significant quiescent drain on the battery.
Typical applications include automotive body-control modules, gateway ECUs between CAN and LIN or CAN-FD subnets, infotainment CAN interfaces, industrial CAN nodes requiring AEC-Q100-grade components, and OBD-II diagnostic interfaces. The very-low standby current also makes the device suitable for battery-powered nodes that wake on bus traffic.
When designing with the TJA1049, observe the standby-state timing budget (typical wake-up filter time) when validating wake-up latency in your network stack. For the HVSON variant (TJA1049TK), the SPLIT pin requires a 10 nF to 47 nF capacitor to ground if used; if the SPLIT function is not needed, the pin can be left open per datasheet guidance.
This page synthesizes NXP datasheet specifications, distributor pricing, drop-in same-package alternatives from NXP's TJA104x family and cross-brand CAN transceivers, and practical design notes that go beyond what is reproduced in the manufacturer datasheet alone.
直接替换替代料： TJA1049 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TJA1050T
✅ 直接替换📋 参考替代料（不在目录中）
TJA1040T
✅ 直接替换📋 参考替代料（不在目录中）
TJA1049TK/3J
✅ 直接替换📋 参考替代料（不在目录中）
TCAN1044AVDR
✅ 直接替换📋 参考替代料（不在目录中）
TLE7254V
✅ 直接替换📋 参考替代料（不在目录中）
TJA1049 规格参数
| 功能 | High-speed CAN transceiver |
| Protocol | ISO 11898-2 (high-speed CAN) |
| Number of Drivers/Receivers | 1/1 |
| 数据速率 | Up to 1 Mbit/s (classic CAN) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Bus Fault Voltage (CANH/CANL) | -27 V to +40 V |
| Dominant-Time-Out (TXD) | Yes (prevents bus lockup) |
| Bus Wake-Up from Standby | Yes (via CAN recessive-to-dominant detection) |
| 热关断 | Yes |
| 工作温度 | -40 °C to +125 °C |
| Package (TJA1049T) | SO-8 (8-SO) |
| Package (TJA1049TK) | HVSON-8 (3x3 mm) with SPLIT pin |
| 安装类型 | Surface Mount |
| Automotive Qualification | AEC-Q100 (per NXP product family) |
| RoHS 状态 | Compliant |
TJA1049 引脚配置
| 引脚 1 | TXD — Transmit data input from CAN controller (logic-level, internal pull-up) |
| 引脚 2 | GND — Ground |
| 引脚 3 | VCC — 5 V supply (4.5 V to 5.5 V) |
| 引脚 4 | RXD — Receive data output to CAN controller (logic-level) |
| 引脚 5 | SPLIT — Common-mode stabilization output (TJA1049TK HVSON variant; NC on TJA1049T) |
| 引脚 6 | CANL — CAN low bus line (differential) |
| 引脚 7 | CANH — CAN high bus line (differential) |
| 引脚 8 | STB — Standby mode control input (active-high) |
典型应用
TJA1049 适用于 6 应用s: Automotive Body Control Module (BCM) CAN Bus, CAN Gateway ECU (between sub-buses), Industrial CAN Node / PLC Module, OBD-II Diagnostic Interface, Battery-Powered CAN Sensor Node, Infotainment CAN Interface.
Automotive Body Control Module (BCM) CAN Bus
The TJA1049 fits BCM applications because of its very-low standby current and bus wake-up capability, which let the BCM sleep while still detecting remote CAN traffic that wakes the ECU. Operating from a 12 V automotive battery via a 5 V regulator, it connects between the BCM's microcontroller CAN controller and the chassis CAN bus. Per the NXP datasheet, its improved EMC/ESD margin over TJA1050/TJA1040 reduces radiated emissions in densely-packed BCMs that share a harness with LIN, FlexRay, and power lines, while the SPLIT pin on the HVSON variant stabilizes the bus common-mode voltage when termination is unbalanced at the BCM end-of-line node.
推荐
CAN Gateway ECU (between sub-buses)
In a central gateway bridging a powertrain CAN bus to a body/chassis CAN bus, the TJA1049 serves as the physical-layer interface on the body/chassis side at classic 1 Mbit/s speeds. Its TXD dominant-time-out prevents a stuck microcontroller from locking the bus in a dominant state, which is critical when the gateway itself fails and the rest of the vehicle must continue operating. The 8-SO package is footprint-compatible with TI TCAN1044A and Infineon TLE7254V, giving gateway designers a multi-source BOM. The -27 V to +40 V bus fault tolerance handles jump-start and reverse-battery events common at the gateway power-feed.
推荐
Industrial CAN Node / PLC Module
Industrial CANopen nodes such as PLC I/O modules and motor starters use the TJA1049 to interface a microcontroller's CAN controller to the trunk bus. The -40 °C to +125 °C operating range covers unheated cabinets and factory-floor environments, while AEC-Q100 automotive-grade silicon gives reliability headroom beyond consumer-grade parts. Per the NXP datasheet, the low standby current lets battery-backed nodes sleep while still waking on bus commands. The 8-SO footprint is compatible with TI TCAN334G (3.3 V logic variant) and Infineon TLE7254V, easing multi-sourcing.
推荐
OBD-II Diagnostic Interface
An OBD-II scan tool or dongle uses the TJA1049 to talk to the vehicle's diagnostic CAN bus at 500 kbit/s (CAN 2.0B / ISO 15765-4). The bus fault tolerance of -27 V to +40 V protects the dongle from the vehicle's 12 V/24 V battery and load-dump transients when plugged in with the engine running. The very-low standby current lets battery-powered dongles sleep between drive cycles. The 8-SO package is widely supported on hobbyist and commercial OBD-II reference designs, and the pin-compatible TI TCAN1044A is a common cross-brand substitute.
推荐
Battery-Powered CAN Sensor Node
Wireless or wireline sensor nodes that sleep most of the time and wake on CAN traffic use the TJA1049 in standby mode to minimize quiescent drain on the local battery. A typical node might consume only the TJA1049's standby current plus the MCU's RTC current, waking the rest of the system only when a CAN dominant edge is detected. The SPLIT pin (HVSON variant) keeps the bus biased correctly when the node is the only one online, avoiding false wake-ups from floating common-mode voltage. The HVSON-8 package is footprint-compatible with NXP TJA1051T/3J.
推荐
Infotainment CAN Interface
In-vehicle infotainment (IVI) head units use the TJA1049 to communicate with the body controller and instrument cluster over a body/chassis CAN bus at 500 kbit/s. Improved EMC performance over TJA1050 is valuable in the dense RF environment of an IVI where AM/FM tuners, Bluetooth, Wi-Fi, and GPS all coexist. The 8-SO package is footprint-compatible with TI TCAN334G (3.3 V logic variant) for IVI designs migrating to lower-voltage MCUs. The bus fault tolerance handles load-dump events when the alternator is under heavy load.
推荐
推荐产品汇总
工程参考数据： TJA1049 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TJA1050T | TJA1040T | TJA1049TK/3J | TCAN1044AVDR | TLE7254V |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | Infineon |
| Package | SO-8 (8-SO) | SO-8 - same | SO-8 - same | HVSON-8 (3x3 mm) - different | SO-8 (8-SOIC) - same | PG-DSO-8 (SO-8) - same |
| Generation | 3rd-gen HS-CAN | 2nd-gen HS-CAN | 1st-gen HS-CAN (legacy) | 3rd-gen HS-CAN | TI CAN-FD (4th-gen equivalent) | Infineon HS-CAN |
| Max Data Rate | 1 Mbit/s (classic CAN) | 1 Mbit/s | 1 Mbit/s | 1 Mbit/s | 5 Mbit/s (CAN-FD) | 1 Mbit/s |
| Standby Current | Very low (typ. low µA) | Higher (~1 mA range) | Higher (legacy) | Same die as TJA1049T | Very low | Low |
| Bus Wake-Up from Standby | Yes | Yes | No (or limited) | Yes | Yes | Yes |
| TXD Dominant-Time-Out | Yes | Yes | No | Yes | Yes | Yes |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Automotive Qualified | AEC-Q100 | AEC-Q100 | AEC-Q100 (legacy) | AEC-Q100 | AEC-Q100 (Q1 suffix) | AEC-Q100 |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
关键差异点
- Third-generation HS-CAN with improved EMC/ESD and very-low standby current （对比 TJA1050T)
- Bus wake-up from standby by CAN signaling （对比 TJA1040T)
- Multi-brand sourcing with same SO-8 footprint （对比 TCAN1044AVDR)
设计说明
Per the NXP TJA1049 datasheet application diagram, place a 100 nF decoupling capacitor as close as possible to the VCC pin (pin 3), with a short ground return to the device's GND pin (pin 2). Keep the TXD and RXD traces short and away from the CANH/CANL differential pair to avoid coupling digital noise into the bus. The CANH/CANL traces should be a 120 Ω characteristic-impedance differential pair, routed as a twisted pair or with ground reference on both sides for the automotive harness segment.
Do not leave TXD floating: the TJA1049 has an internal pull-up, but an external 10 kΩ pull-up to VCC is recommended to guarantee a recessive idle state during microcontroller reset or brown-out. Conversely, do not tie STB (pin 8) high without verifying the wake-up timing budget - a stuck-high STB disables bus transmission while still allowing reception. For the HVSON variant (TJA1049TK), the SPLIT pin (pin 5) requires a 10 nF to 47 nF capacitor to ground if used; if SPLIT functionality is not needed, the pin can typically be left open per datasheet guidance but verify against the specific datasheet revision.
The TJA1049's bus fault tolerance is -27 V to +40 V per the NXP datasheet, which covers 12 V and 24 V automotive battery systems including jump-start events. However, sustained overvoltage (e.g., from a failed alternator regulator) can still damage the part. In safety-critical applications, add an external TVS diode such as NXP PESD1CAN or equivalent across CANH/CANL, and a series fuse or PTC on VCC. Verify that the ESD rating on your chosen TVS exceeds the IEC 61000-4-2 level expected at the connector (typically ±8 kV contact, ±15 kV air for automotive body modules).
Estimated: at VCC = 5.0 V, the TJA1049's supply current in normal operating mode is on the order of tens of mA (dominant) and a few mA (recessive), per typical NXP HS-CAN transceiver behavior. In standby mode the current drops to single-digit µA or below. For a battery-backed node that sleeps 99% of the time, the standby current dominates the energy budget; size the local battery accordingly. A 100 nF X7R ceramic on VCC is mandatory; add a 1 µF to 10 µF bulk capacitor on the 5 V rail to handle the dominant-bit inrush.
合规信息
RoHS and REACH compliance per NXP product page; AEC-Q100 automotive qualified per NXP product family positioning for high-speed CAN automotive industry use.
