TXB0108QPWRQ1 - 8-Bit Auto-Direction Level Translator | TI
MPN: TXB0108QPWRQ1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for TXB0108QPWRQ1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TXB0108PWR
β Drop-Inβ In Stock
$0.18 / Unit
View Datasheet βTXS0108EPWR
β‘ Same Packageβ In Stock
$0.58 / Unit
View Datasheet βTXB0108QPWRQ1 Maximum Ratings & Electrical Characteristics
| Function | 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) | Β±15 kV (air-gap discharge) on I/O |
| Number of Channels | 8 |
| Operating Temperature | -40C to +125C |
| Automotive Qualification | AEC-Q100 qualified |
| Package | TSSOP-20 (PW) |
| Mounting Type | Surface Mount |
| Output Type | Push-pull, symmetrical drive |
| Family | TXB |
| RoHS Status | Compliant |
| Supply Current | [DATA_NEEDED: ICC max] |
| MSL Level | [DATA_NEEDED: MSL] |
TXB0108QPWRQ1 Pin Configuration
| Pin 1 | A1 β Port A data 1 (1.2V-3.6V domain) |
| Pin 2 | VCCA β Port A supply, 1.2V to 3.6V |
| Pin 3 | A2 β Port A data 2 |
| Pin 4 | A3 β Port A data 3 |
| Pin 5 | A4 β Port A data 4 |
| Pin 6 | A5 β Port A data 5 |
| Pin 7 | A6 β Port A data 6 |
| Pin 8 | A7 β Port A data 7 |
| Pin 9 | A8 β Port A data 8 |
| Pin 10 | GND β Ground |
| Pin 11 | OE β Output enable; low = all I/O Hi-Z |
| Pin 12 | B8 β Port B data 8 (1.65V-5.5V domain) |
| Pin 13 | B7 β Port B data 7 |
| Pin 14 | B6 β Port B data 6 |
| Pin 15 | B5 β Port B data 5 |
| Pin 16 | B4 β Port B data 4 |
| Pin 17 | B3 β Port B data 3 |
| Pin 18 | B2 β Port B data 2 |
| Pin 19 | VCCB β Port B supply, 1.65V to 5.5V |
| Pin 20 | B1 β Port B data 1 |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TXB0108QPWRQ1 is suitable for 6 applications: 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 Β±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.
Recommended
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 Β±15kV ESD rating protects lines routed to external sensor connectors, and Hi-Z OE control permits safe hot-plugging of sensor modules during diagnostics.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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 Β±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.
Recommended
Recommended Products Summary
Engineering reference data for TXB0108QPWRQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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) |
| ESD Protection | Β±15 kV (IEC) | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive AEC-Q100 | Yes, -40C to +125C | No (commercial grade) | No (commercial grade) |
| Direction Control | Auto-direction | Auto-direction | Auto-direction |
| Indicated Price (1 pc, as of 2026-08-29) | $1.35 | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- AEC-Q100 Grade 1 automotive qualification (vs TXB0108PWR)
- Β±15kV ESD protection on I/O (vs TXS0108EPWR)
- No DIR pin needed (auto-direction) (vs DIR-controlled translators such as SN74AVC8T245)
Design Notes
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.
Compliance Information
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.
