TXS0102-Q1 - 2-Bit Auto-Direction Level Translator | TI
MPN： TXS0102-Q1 ✓ 啟用中TXS0102-Q1 概覽
A voltage-level translator, or level shifter, is a logic IC that connects incompatible logic families or systems operating at different supply voltages, such as a 1.65V microcontroller communicating with a 3.3V or 5V peripheral. Within the signal-chain hierarchy, level translators sit between logic ICs and interface ICs, enabling safe chip-to-chip communication where voltage mismatch would otherwise damage a driver or fail to meet input thresholds.
Key features include auto-direction sensing on both channels, A-port supply (VCCA) from 1.2V to 3.6V and B-port supply (VCCB) from 1.65V to 5.5V, an output-enable (OE) input referenced to VCCA that places all I/O in high impedance when low, and internal 10 kOhm pull-up resistors on the I/Os that make the device ideal for open-drain drivers such as I2C buses. The -Q1 suffix denotes AEC-Q100 qualification for automotive applications.
Technically, the TXS0102 architecture uses two NMOS pass transistors with 10 kOhm pull-ups per I/O, allowing either port to drive the signal while the opposite side is pulled to its rail. This push-pull capability plus open-drain support distinguishes it from passive FET translators and fixed-direction buffers.
Typical applications include I2C and SMBus level translation in automotive body electronics, UART and GPIO bridging in cluster and infotainment modules, and low-speed sensor interface translation between 1.8V MCUs and 3.3V peripherals.
Design tip: tie OE to GND through a pull-down resistor to guarantee high impedance during power-up, and for push-pull drivers note that the internal 10 kOhm pull-ups limit edge rates at heavy capacitive loads.
直接替換替代品，適用於 TXS0102-Q1 — 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： TXS0102-Q1 （相同外形與佔位） — 差異在於 Applications, Operating Temperature.
TXS0102DCUR
✅ 直接替換聯絡詢價
查看資料表 →TXB0102DCUR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LSF0102DCUR
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PCA9306DCUR
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ETF0102
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TXS0102-Q1 規格
| 功能 | 2-bit bidirectional voltage-level translator |
| Translator Type | Open-drain and push-pull, auto-direction |
| 通道數 | 2 |
| 資料速率 | 24 Mbps |
| VCCA Supply Range | 1.2 V to 3.6 V |
| VCCB Supply Range | 1.65 V to 5.5 V |
| Output Enable | Yes (OE referenced to VCCA, active high) |
| Pull-up Resistors | Internal 10 kOhm on I/Os |
| High-Impedance State | Yes (OE low) |
| 封裝 | 8-VSSOP (DCU) |
| 安裝類型 | Surface Mount |
| Qualification | AEC-Q100 automotive grade |
| 工作溫度 | -40C to +125C |
| RoHS 狀態 | Compliant |
| Applications | I2C, SMBus, UART, GPIO level translation |
TXS0102-Q1 腳位配置
| 腳位 1 | A1 — A-port data I/O 1 |
| 腳位 2 | VCCA — A-port supply, 1.2V to 3.6V; powers OE input circuit |
| 腳位 3 | GND — Ground |
| 腳位 4 | B2 — B-port data I/O 2 |
| 腳位 5 | B1 — B-port data I/O 1 |
| 腳位 6 | OE — Output enable, referenced to VCCA; low = high impedance |
| 腳位 7 | VCCB — B-port supply, 1.65V to 5.5V |
| 腳位 8 | A2 — A-port data I/O 2 |
典型應用
TXS0102-Q1 適用於 6 應用s: Automotive I2C Level Translation, MCU-to-Peripheral GPIO Bridging, UART Interface Translation, Sensor Interface Level Shifting, Infotainment and Display Control, Battery Management System (BMS) Communications.
Automotive I2C Level Translation
The TXS0102-Q1 fits automotive I2C buses bridging a 1.8V or 3.3V MCU to 5V sensors and EEPROMs because its internal 10 kOhm pull-ups and open-drain support match the shared-bus topology without external FETs or pull-up sizing. Placed between the MCU SDA/SCL pair and the peripheral rail, it auto-directions traffic at up to 24 Mbps, far beyond 400 kHz Fast-mode I2C. AEC-Q100 qualification and -40C to +125C operation cover under-hood and body-electronics environments.
推薦
MCU-to-Peripheral GPIO Bridging
In mixed-voltage boards, a 1.2V or 1.8V MCU GPIO pair can drive 3.3V or 5V indicators and inputs through the TXS0102-Q1. The auto-direction architecture means no MCU pin is spent on a DIR signal, and the OE pin allows the GPIO banks to float safely during boot when sequenced from VCCA. Push-pull support lets the 10 kOhm pull-ups be overridden by active drivers, making this suitable for status lines, enables, and low-speed control signals up to 24 Mbps.
推薦
UART Interface Translation
UART TX and RX form a natural 2-bit push-pull pair for the TXS0102-Q1, translating a 1.8V automotive MCU console to a 3.3V or 5V telematics modem. Because UART lines are point-to-point driven, the internal pull-ups cause no contention, and the 24 Mbps rating exceeds standard UART rates (up to 3-6 Mbaud). The OE pin referenced to VCCA ensures the lines are high-impedance until the MCU rail is up, preventing bus fights during power sequencing.
推薦
Sensor Interface Level Shifting
Analog-front-end and sensor modules frequently run 3.3V digital interfaces while host MCUs drop to 1.8V for power savings. The TXS0102-Q1 translates the two-wire sensor control/data pair (such as I2C or a clock/data pair) between these domains. Its open-drain tolerance makes it safe for shared alert and ready lines, and AEC-Q100 qualification permits placement in camera, radar, and battery-management sensor harnesses where automotive reliability screening is mandatory.
推薦
Infotainment and Display Control
Cluster and infotainment modules mix 1.8V SoC GPIO domains with 3.3V or 5V display, backlight, and touch-controller interfaces. The TXS0102-Q1 provides a compact 2-bit bridge for I2C touch-panel control or configuration lines, keeping the design small in the DCU package. Its high-impedance OE state protects the display connector during module power cycling, and 24 Mbps headroom supports configuration updates without constraining bus timing.
推薦
Battery Management System (BMS) Communications
BMS stack controllers often run 1.8V logic while monitoring ICs and isolation interfaces use 3.3V or 5V digital levels. The TXS0102-Q1 bridges the I2C/SMBus or status pair between these domains. Its tolerance of open-drain shared buses suits multi-drop monitoring links, and the automotive temperature range plus AEC-Q100 rating match the under-hood and in-pack environments where BMS electronics operate over -40C to +125C.
推薦
推薦產品摘要
工程參考資料，適用於 TXS0102-Q1 — 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 | TXS0102DCUR | TXB0102DCUR | LSF0102DCUR |
|---|---|---|---|---|
| Package | 8-VSSOP (DCU) | 8-VSSOP (DCU) - same | 8-VSSOP (DCU) - same | 8-VSSOP (DCU) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Internal Pull-ups | 10 kOhm per I/O | 10 kOhm per I/O | None | None (external required) |
| Open-Drain Support | Yes (I2C/SMBus) | Yes | No (push-pull only) | Yes |
| Direction Control | Auto-direction + OE pin | Auto-direction + OE pin | Auto-direction + OE | Passive switch + EN |
| VCCA Range | 1.2V to 3.6V | 1.2V to 3.6V | 1.2V to 3.6V | 0.95V to 3.6V |
| Pin-to-Pin Compatible | - | Yes (drop-in) | Yes | No - verify pinout |
主要差異化特點
- Automotive AEC-Q100 qualification (對比TXS0102DCUR)
- Open-drain bus support with internal 10 kOhm pull-ups (對比TXB0102DCUR)
- True auto-direction operation (對比LSF0102DCUR)
設計說明
Observe power sequencing guidance: VCCA powers the OE input circuit, so if VCCA is absent OE must be held low to keep outputs high-impedance. TI's product documentation explicitly recommends tying OE to GND through a pull-down resistor (value set by the driver's current-sourcing capability) to guarantee high-Z during power-up or power-down. Sequence VCCA before or together with VCCB for predictable I/O states.
The internal 10 kOhm pull-ups on every I/O mean rise time is set by pull-up resistance times bus capacitance. On I2C Fast-mode (400 kHz) buses with 200 pF load, the 10 kOhm pull-up gives roughly 2 us RC rise, potentially violating the 300 ns specification; add external parallel pull-ups (e.g., 1-2 kOhm) on the bus if needed, or use external pull-ups exclusively on push-pull-driven nets.
Do not substitute cross-brand SOIC-8 or VSSOP-8 level shifters without checking pinout: a TI E2E forum thread confirms TXS0102QDCURQ1 does not share the pinout of onsemi NLVSX4373DR2G despite both being 8-pin packages. Also remember the TXS (open-drain capable) and TXB (push-pull only) families are not functionally interchangeable on shared buses like I2C.
Place 0.1 uF ceramic decoupling capacitors within 2 mm of both VCCA and VCCB pins to the nearest ground. Keep the A-side and B-side traces short and matched for the signal pair to minimize skew; the DCU footprint allows routing both channels side-by-side. No thermal pad is present, so standard SMD reflow profiles apply.
合規資訊
AEC-Q100 automotive qualification per TI product page. RoHS/lead-free status per standard TI catalog practice; detailed REACH and halogen data [DATA_NEEDED: REACH/halogen-free certificate].
