TXS0102DCUR - 2-Bit Bidirectional Level Shifter | Texas Instruments
MPN: TXS0102DCUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.5 | $5.00 |
| 100 | $0.4 | $40.00 |
| 500 | $0.34 | $170.00 |
| 1,000 | $0.28 | $280.00 |
TXS0102DCUR Overview
A voltage-level translator, also called a level shifter, is an integrated circuit that allows communication between components operating at different voltage levels. In mixed-voltage systems combining 3.3V microcontrollers with 5V sensors, or 1.8V logic with 3.3V peripherals, level shifters ensure logic high and low signals are correctly interpreted across voltage domains. The TXS0102 belongs to the bidirectional translator class, which shifts signals in both directions without a direction-control signal, simplifying design and reducing pin count within the broader logic IC and voltage-translation hierarchy.
Key features include auto-direction sensing with no direction pin required, maximum data rates of 24 Mbps for push-pull and 2 Mbps for open-drain applications, and support for I2C, SMBus, and UART interfaces. A one-shot accelerator architecture speeds up rising edges even with capacitive loads. The OE pin, when low, places outputs in a high-impedance state for power sequencing and bus isolation.
Technically, the TXS0102 uses a pass-gate architecture with integrated pull-up resistors on both A and B ports. When a line is driven low the pass-gate turns on; when released, internal pull-ups raise the line to the respective rail. This enables true bidirectional operation without external control.
Typical applications include interfacing microcontrollers with sensors at different voltages, I2C and SMBus bus translation, and UART level shifting between 3.3V and 5V systems in consumer electronics, industrial control, and automotive infotainment.
Design tip: ensure VCCA and VCCB stay within specified ranges, control the OE pin to avoid bus contention, and consider the 24 Mbps limit for high-speed links.
Drop-in alternatives for TXS0102DCUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TXS0102DCUR (same form factor and footprint) — differing in Applications, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TXS0102QDCURQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TXS0102DCUT
✅ Drop-In📋 Reference alternative (not in catalog)
UM3202V
✅ Drop-In📋 Reference alternative (not in catalog)
TXB0102DCUR
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LSF0102DDFR
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
$0.33 / Unit
View Datasheet →TXS0102DCUR Maximum Ratings & Electrical Characteristics
| Function | 2-bit bidirectional voltage-level translator |
| Channels per Circuit | 2 |
| VCCA Supply Range (A Port) | 1.65 V to 3.6 V |
| VCCB Supply Range (B Port) | 2.3 V to 5.5 V |
| Maximum Data Rate (Push-Pull) | 24 Mbps |
| Maximum Data Rate (Open-Drain) | 2 Mbps |
| Direction Control | Automatic (no DIR pin) |
| Output Enable (OE) | Yes (high-impedance when low) |
| Interface Support | I2C, SMBus, UART, push-pull |
| Architecture | Pass-gate with one-shot edge accelerator |
| Operating Temperature | -40C to +85C |
| Package | 8-VSSOP (DCU) |
| Mounting Type | Surface Mount |
| Applications | Open-drain and push-pull |
| RoHS Status | Compliant |
| Category | Translation - Voltage Levels |
TXS0102DCUR Pin Configuration
| Pin 1 | VCCA — A-port supply, 1.65V to 3.6V |
| Pin 2 | A1 — A-side data 1 (tracks VCCA) |
| Pin 3 | A2 — A-side data 2 (tracks VCCA) |
| Pin 4 | GND — Ground |
| Pin 5 | B2 — B-side data 2 (tracks VCCB) |
| Pin 6 | B1 — B-side data 1 (tracks VCCB) |
| Pin 7 | OE — Output enable; low = all ports high-impedance |
| Pin 8 | VCCB — B-port supply, 2.3V to 5.5V |
Typical Applications
TXS0102DCUR is suitable for 6 applications: I2C / SMBus Level Translation, 3.3V MCU to 5V Peripheral Interface, UART Level Shifting, Automotive Infotainment buses, Mixed-Voltage Sensor Systems, Consumer Electronics / Portable Devices.
I2C / SMBus Level Translation
The TXS0102DCUR is purpose-built for open-drain bus translation: its internal pull-ups (B-side 4-10 kOhm, A-side 40 kOhm typical) replace external resistors, and the 2 Mbps open-drain rating covers Fast-mode Plus I2C (1 Mbps) and SMBus. The one-shot accelerator drives rising edges quickly against bus capacitance, keeping rise times within I2C timing. Place the device close to the master, keep SDA/SCL traces short, and hold OE low until both rails stabilize to avoid partial-rail contention.
Recommended
3.3V MCU to 5V Peripheral Interface
With VCCA at 3.3V and VCCB at 5V, the TXS0102DCUR bridges classic 5V peripherals (displays, EEPROM, sensors) to modern 3.3V microcontrollers. Push-pull channels run at up to 24 Mbps, far beyond typical SPI/UART needs, and auto-direction eliminates a GPIO spent on DIR control. The VSSOP-8 footprint fits cramped board areas; ensure each VCC pin has a 0.1 uF decoupling capacitor within 2 mm and that 5V-side drivers do not back-drive the A port through the pass-gate.
Recommended
UART Level Shifting
Two-wire UART links (TXD/RXD) map directly onto the two TXS0102DCUR channels for 1.8V/2.5V/3.3V to 5V translation. The 24 Mbps push-pull rating supports high-baud links, and the one-shot circuit restores clean edges on the 5V side. Because UART is point-to-point, the auto-direction architecture never sees contention as long as both sides idle high - a condition the internal pull-ups guarantee. Avoid using TXS-type translators on multidrop RS-485 buses; use a proper transceiver there instead.
Recommended
Automotive Infotainment buses
The AEC-Q100-qualified TXS0102QDCURQ1 sibling makes the TXS0102 architecture suitable for automotive infotainment I2C control buses between 3.3V SoCs and 5V display/audio peripherals. For new automotive designs select the Q1 variant; the standard DCUR serves Tier-2 industrial and consumer assemblies. The OE pin allows the body controller to isolate the bus during start-up power sequencing, and the -40C to +85C grade covers most cabin environments (Q1 extends to +125C).
Recommended
Mixed-Voltage Sensor Systems
Many precision sensors and ADC modules run at 5V while host MCUs and FPGAs are 1.8V or 3.3V. The TXS0102DCUR translates I2C/SMBus control and status lines across this gap with its 1.65V-3.6V A-side and 2.3V-5.5V B-side ranges. Its high-impedance OE state lets a single bus serve multiple voltage domains during board bring-up. For high-speed sensor data (above 24 Mbps), pair with TXB- or AVC-family translators instead; TXS0102 targets control buses.
Recommended
Consumer Electronics / Portable Devices
In phones, tablets, and smart-home devices, the tiny 8-VSSOP (DCU) 2x2 mm-class footprint and low external-component count (two 0.1 uF capacitors) make the TXS0102DCUR ideal for translating between low-voltage application processors and 3.3V/5V accessory interfaces. The cost-effective UM3202V cross-brand alternative targets the same mass-produced consumer sockets where sourcing flexibility matters more than automotive qualification. Typical loads: touch-controller I2C, power-management SMBus, and low-rate accessory UARTs.
Recommended
Recommended Products Summary
Engineering reference data for TXS0102DCUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TXS0102QDCURQ1 | TXS0102DCUT | UM3202V | TXB0102DCUR |
|---|---|---|---|---|---|
| Package | VSSOP-8 (DCU) | VSSOP-8 (DCU) - same | VSSOP-8 (DCU) - same | VSSOP-8 (DCU) - same | VSSOP-8 (DCU) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Union Semiconductor | Texas Instruments |
| Data Rate (Push-Pull) | 24 Mbps | 24 Mbps | 24 Mbps | 24 Mbps | 50 Mbps (push-pull only) |
| Data Rate (Open-Drain) | 2 Mbps | 2 Mbps | 2 Mbps | 2 Mbps | Not supported |
| Open-Drain / I2C Support | Yes | Yes | Yes | Yes | No |
| AEC-Q100 Qualified | No | Yes | No | No | No |
| Integrated Pull-Ups | Yes (A and B ports) | Yes | Yes | Yes | Weak (not I2C capable) |
| VCCA Range | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V | 1.2V to 3.6V |
Key Differentiators
- Native I2C/open-drain support with integrated pull-ups (vs TXB0102DCUR)
- Automotive upgrade path without PCB change (vs TXS0102QDCURQ1)
- Cost-reduced cross-brand sourcing option (vs UM3202V)
Design Notes
Decouple VCCA and VCCB each with a 0.1 uF ceramic capacitor placed within 2 mm of the pins. Do not apply VCCB before VCCA exceeds the datasheet minimum while OE is high, or the device may back-power the A-side rail through internal pull-ups - a common cause of unexplained standby current in battery designs. The TI datasheet recommends tying OE low with a resistor or supervisor until both rails are valid.
TXS-family translators have weak internal pull-ups and a one-shot edge accelerator; never use them for push-pull output contention, bus-keeper conflict, or high-capacitance lines (e.g., long ribbon cables) where the one-shot can oscillate. For I2C, verify bus capacitance keeps rise time within spec; adding external pull-ups in parallel with internal ones can degrade 1.8V logic levels. Do not exceed the 24 Mbps (push-pull) or 2 Mbps (open-drain) rates.
The 8-VSSOP (DCU) package is lead-pitch dense; use a standard DCU land pattern with solder-mask-defined pads for reliable reflow. Route A-side and B-side traces with a ground reference to preserve edge integrity at 24 Mbps. Keep I2C traces short (<10 cm preferred) to minimize capacitance. The exposed leads have no thermal pad - thermal management is not a concern at logic currents, but reflow profile must follow MSL rating on the label.
Compliance Information
RoHS compliant and lead-free per TI product page and distributor listings. Not AEC-Q100 qualified - use TXS0102QDCURQ1 for automotive.
