TXB0108QPWRQ1 - 8-Bit Auto-Direction Level Translator | TI
MPN： TXB0108QPWRQ1 ✓ 啟用中TXB0108QPWRQ1 概覽
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.
直接替換替代品，適用於 TXB0108QPWRQ1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TXB0108QPWRQ1 （相同外形與佔位） — 差異在於 Package, Direction Control, Output Type, Translator Type, Operating Temperature.
TXB0108PWR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TXS0108EPWR
⚡ 相同封裝 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TXB0108QPWRQ1 最大額定值與電氣特性
| 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 |
| 工作溫度 | -40C to +125C |
| Automotive Qualification | AEC-Q100 qualified |
| 封裝 | TSSOP-20 (PW) |
| 安裝類型 | Surface Mount |
| 輸出類型 | Push-pull, symmetrical drive |
| Family | TXB |
| RoHS 狀態 | Compliant |
TXB0108QPWRQ1 腳位配置
| 腳位 1 | A1 — Port A data 1 (1.2V-3.6V domain) |
| 腳位 2 | VCCA — Port A supply, 1.2V to 3.6V |
| 腳位 3 | A2 — Port A data 2 |
| 腳位 4 | A3 — Port A data 3 |
| 腳位 5 | A4 — Port A data 4 |
| 腳位 6 | A5 — Port A data 5 |
| 腳位 7 | A6 — Port A data 6 |
| 腳位 8 | A7 — Port A data 7 |
| 腳位 9 | A8 — Port A data 8 |
| 腳位 10 | GND — Ground |
| 腳位 11 | OE — Output enable; low = all I/O Hi-Z |
| 腳位 12 | B8 — Port B data 8 (1.65V-5.5V domain) |
| 腳位 13 | B7 — Port B data 7 |
| 腳位 14 | B6 — Port B data 6 |
| 腳位 15 | B5 — Port B data 5 |
| 腳位 16 | B4 — Port B data 4 |
| 腳位 17 | B3 — Port B data 3 |
| 腳位 18 | B2 — Port B data 2 |
| 腳位 19 | VCCB — Port B supply, 1.65V to 5.5V |
| 腳位 20 | B1 — Port B data 1 |
典型應用
TXB0108QPWRQ1 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 TXB0108QPWRQ1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- AEC-Q100 Grade 1 automotive qualification (對比TXB0108PWR)
- ±15kV ESD protection on I/O (對比TXS0108EPWR)
- No DIR pin needed (auto-direction) (對比DIR-controlled translators such as SN74AVC8T245)
設計說明
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.
合規資訊
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.
