TXB0108QPWRQ1 - 8-Bit Auto-Direction Level Translator | TI
料号： TXB0108QPWRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.35 | $1.35 |
| 10 | $1.22 | $12.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.68 | $680.00 |
TXB0108QPWRQ1 概述
A voltage-level translator (also called a logic level shifter) is an interface IC that enables digital devices operating on different supply rails - such as a 1.8V microcontroller and a 5V peripheral - to communicate reliably. Translators sit within the broader logic IC family, under interface and signal-conversion devices, and are essential wherever mixed-voltage systems coexist on one board.
Key features include auto-direction sensing that eliminates the need for a direction-control pin, an output-enable (OE) input that places all I/O in Hi-Z when low, and ±15kV IEC ESD protection on I/O pins. The TXB0108-Q1 uses TI TXB-type push-pull architecture, delivering symmetric drive on both ports without external pull-up or pull-down resistors, and supports data rates up to 100 Mbps for 1.2V to 3.6V translation per the datasheet.
The device operates from -40C to +125C (AEC-Q100 Grade 1), making it suitable for harsh automotive environments. Its TSSOP-20 package is standard, easy to assemble, and compatible with the commercial TXB0108PWR footprint for design reuse.
Typical applications include automotive infotainment and cluster modules interfacing 3.3V MCUs with 5V sensors, mixed-voltage SPI/I2C-style GPIO expansion, industrial control modules, and portable mixed-signal systems bridging 1.8V and 5V rails.
Design note: the TXB architecture has relatively weak output drive (not intended for bus-holding or heavy loads); avoid using it for I2C open-drain buses - the TXS family is a better fit. Pull OE low during power sequencing to prevent bus contention.
直接替换替代料： TXB0108QPWRQ1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TXB0108QPWRQ1 （相同外形与封装尺寸） ——差异在于 Package, Direction Control, Output Type, Translator Type, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
TXB0108PWR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.26 / 个
查看数据手册 →TXS0108EPWR
⚡ 相同封装 ⚠️ 规格未核验✓ 有现货
$0.51 / 个
查看数据手册 →TXB0108QPWRQ1 最大额定值与电气特性
| 功能 | 8-bit bidirectional voltage-level translator |
| Port A Supply (VCCA) | 1.2 V to 3.6 V |
| Port B Supply (VCCB) | 1.65 V to 5.5 V |
| Direction Control | Auto-direction sensing |
| Output Enable (OE) | Yes, all I/O Hi-Z when low |
| ESD Protection (IEC) | ±15 kV (air-gap discharge) on I/O |
| Number of Channels | 8 |
| 工作温度 | -40C to +125C |
| Automotive Qualification | AEC-Q100 qualified |
| 封装 | TSSOP-20 (PW) |
| 安装类型 | Surface Mount |
| 输出类型 | Push-pull, symmetrical drive |
| Family | TXB |
| RoHS 状态 | Compliant |
TXB0108QPWRQ1 引脚配置
| 引脚 1 | A1 — Port A data 1 (1.2V-3.6V domain) |
| 引脚 2 | VCCA — Port A supply, 1.2V to 3.6V |
| 引脚 3 | A2 — Port A data 2 |
| 引脚 4 | A3 — Port A data 3 |
| 引脚 5 | A4 — Port A data 4 |
| 引脚 6 | A5 — Port A data 5 |
| 引脚 7 | A6 — Port A data 6 |
| 引脚 8 | A7 — Port A data 7 |
| 引脚 9 | A8 — Port A data 8 |
| 引脚 10 | GND — Ground |
| 引脚 11 | OE — Output enable; low = all I/O Hi-Z |
| 引脚 12 | B8 — Port B data 8 (1.65V-5.5V domain) |
| 引脚 13 | B7 — Port B data 7 |
| 引脚 14 | B6 — Port B data 6 |
| 引脚 15 | B5 — Port B data 5 |
| 引脚 16 | B4 — Port B data 4 |
| 引脚 17 | B3 — Port B data 3 |
| 引脚 18 | B2 — Port B data 2 |
| 引脚 19 | VCCB — Port B supply, 1.65V to 5.5V |
| 引脚 20 | B1 — Port B data 1 |
典型应用
TXB0108QPWRQ1 适用于 6 应用s: Automotive Infotainment and Cluster Modules, Mixed-Voltage MCU to Sensor Interfacing, Industrial PLC and Control Modules, SPI and UART Signal Translation, Battery-Powered Portable Systems, Test and Measurement Fixtures.
Automotive Infotainment and Cluster Modules
The TXB0108QPWRQ1 bridges 3.3V MCU GPIO with 5V peripherals in head units and instrument clusters, where its AEC-Q100 Grade 1 rating (-40C to +125C) and ±15kV ESD protection address the harsh electrical environment of the vehicle. Its auto-direction sensing simplifies mixed-signal boards with bidirectional control lines. Placed between the SoC bank and display or sensor connectors, the push-pull TXB outputs preserve signal edges without pull-up resistors, while the OE pin prevents contention during the vehicle's staged power-up sequencing.
推荐
Mixed-Voltage MCU to Sensor Interfacing
Microcontrollers running at 1.8V frequently need to drive 3.3V or 5V sensors and actuators. The TXB0108QPWRQ1 covers exactly this window - VCCA from 1.2V to 3.6V and VCCB from 1.65V to 5.5V - allowing an 8-bit bus translation with a single TSSOP-20 device. Because TXB outputs are push-pull on both sides, no external resistors are needed, keeping the BOM minimal. The ±15kV ESD rating protects lines routed to external sensor connectors, and Hi-Z OE control permits safe hot-plugging of sensor modules during diagnostics.
推荐
Industrial PLC and Control Modules
In programmable-logic-controller I/O cards, legacy 5V peripherals must often communicate with modern 3.3V processors. The TXB0108QPWRQ1 provides an 8-bit bidirectional path with auto-direction sensing, removing firmware direction management in backplane communication. Its wide -40C to +125C operating range tolerates cabinet temperature extremes, and the TSSOP-20 package suits standard wave or reflow assembly. The OE pin allows the CPU to isolate the backplane bus during module insertion, preventing data corruption on live industrial buses.
推荐
SPI and UART Signal Translation
Push-pull buses such as SPI and UART are the ideal match for the TXB0108-Q1 architecture: each channel's direction is detected automatically per byte edge, supporting full-duplex SPI where four lines each have a fixed driver. TI's datasheet rates the device up to approximately 100 Mbps depending on supply levels, comfortably covering SPI clocks of 50 MHz class peripherals. Unlike DIR-controlled translators, no software latency is added on CS transitions, and the symmetric drive keeps rise/fall times balanced, preserving setup and hold margins at the receiver.
推荐
Battery-Powered Portable Systems
Portable devices mixing a 1.8V low-power processor with 3.3V or 5V display, memory, and radio modules use the TXB0108QPWRQ1's wide 1.2V-3.6V Port A range to ride through battery discharge without re-specifying rails. The OE pin lets the system place all eight channels in Hi-Z during sleep, minimizing bus leakage. Its single-package integration of eight channels saves board area versus discrete transistor shifting, and the TSSOP-20 footprint simplifies layout on two-layer consumer PCBs where space and cost dominate.
推荐
Test and Measurement Fixtures
Bench instruments and automated test equipment must interface devices-under-test with unknown or mixed logic levels. The TXB0108QPWRQ1 provides an 8-bit buffer covering 1.2V to 5.5V combined range with auto direction, so fixture firmware does not need to preconfigure signal direction per DUT. The ±15kV ESD tolerance adds robustness against charged-DUT discharge events on connectorized fixtures. Its Hi-Z OE state lets the host isolate the DUT bus entirely during fixture changeover, protecting both instrument and device under test.
推荐
推荐产品汇总
工程参考数据： TXB0108QPWRQ1 ——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 | TXB0108PWR | TXS0108EPWR |
|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| VCCA Range | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 1.65 V to 3.6 V |
| VCCB Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Output Type | Push-pull (TXB) | Push-pull (TXB) | Switch-type (open-drain capable) |
| Automotive AEC-Q100 | Yes, -40C to +125C | No (commercial grade) | No (commercial grade) |
| Direction Control | Auto-direction | Auto-direction | Auto-direction |
关键差异点
- AEC-Q100 Grade 1 automotive qualification （对比 TXB0108PWR)
- ±15kV ESD protection on I/O （对比 TXS0108EPWR)
- No DIR pin needed (auto-direction) （对比 DIR-controlled translators such as SN74AVC8T245)
设计说明
Do not use the TXB0108QPWRQ1 on open-drain buses such as I2C. The push-pull TXB output stage cannot be overdriven by external pull-ups and can enter contention when a receiver drives against it. TI's application guidance recommends the TXS family (e.g., TXS0108E, same TSSOP-20 footprint) for I2C. TXB is ideal for SPI, UART, and push-pull GPIO where the driver is always actively driven.
Sequence OE low until both VCCA and VCCB are within their recommended operating ranges. Pulling OE high while one rail is absent can leave the opposite port pins weakly driven and cause bus glitches or excess leakage. A simple RC or supervisor on OE from TI power-sequencing app notes (e.g., TI SLVA172-style level-shifter guides) ensures clean enable after both supplies settle.
Place 0.1uF ceramic decoupling capacitors within 2 mm of both VCCA (pin 2) and VCCB (pin 19) to ground, plus one bulk 1uF per rail. TXB push-pull edges drive fast charge into trace capacitance on all eight channels simultaneously; inadequate local decoupling manifests as supply droop-induced glitches. Keep A-side and B-side traces separated to preserve isolation between voltage domains.
合规信息
AEC-Q100 automotive qualified per TI product page and part suffix Q1. RoHS/lead-free status inferred from TI Q1 portfolio; verify on TI.com quality page for REACH details.
