TXB0104W-Q1 - 4-Bit Auto-Direction Level Translator | Texas Instruments
MPN: TXB0104W-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.88 | $440.00 |
| 1,000 | $0.72 | $720.00 |
TXB0104W-Q1 Overview
A voltage-level translator is a member of the logic IC family (voltage-level translator -> logic IC -> integrated circuit) that allows two circuit domains operating at different supply voltages to exchange digital signals safely. On mixed-voltage PCBs - for example, a 1.8 V microcontroller talking to a 3.3 V sensor - the translator isolates the rails while preserving logic polarity and timing, preventing overvoltage damage and logic-level misreads.
Key features of the TXB0104W-Q1 include automatic direction sensing that eliminates DIR control pins, push-pull topology optimization delivering 100 Mbps throughput, and a compact 12-pin UQFN footprint of approximately 2 mm x 2 mm that saves board area. The +/-15 kV ESD rating (IEC) on the I/O ports adds robustness in harsh automotive electrical environments. According to TI product data, the device uses two separate configurable power-supply rails; the A port tracks VCCA and the B port tracks VCCB.
Architecturally, the TXB family uses a two-transistor output driver with an integrated one-shot edge-rate accelerator on each side, giving fast transition times for push-pull CMOS signals. This makes it well suited to SPI, UART, and general-purpose push-pull GPIO translation. Note that, as TI applications guidance states, the TXB architecture is not recommended for open-drain buses such as I2C or 1-Wire, where the internal drivers contend with external pull-ups.
Typical applications include automotive body electronics and gateways translating between 1.8 V SoC GPIO and 3.3 V peripherals, infotainment and display module signal interfaces, and industrial control modules requiring AEC-Q100 qualified components.
Design tip: keep VCCA ramps before or after VCCB within datasheet sequencing guidance, and place the two 0.1 uF decoupling capacitors directly at the VCCA and VCCB pins; the auto-direction sensing requires push-pull sources on both sides to function reliably.
This page synthesizes distributor pricing tiers, verified drop-in alternatives from TI cross-reference discussions, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for TXB0104W-Q1 — 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 TXB0104W-Q1 (same form factor and footprint) — differing in Function, Operating Temperature, Output Type, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TXB0104RUTR
✅ Drop-In✓ In Stock
$0.65 / Unit
View Datasheet →TXU0104-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TXU0204-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TXU0304-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TXB0104W-Q1 Maximum Ratings & Electrical Characteristics
| Function | 4-bit bidirectional voltage-level translator with auto direction |
| Channels | 4 |
| VCCA Supply Range | 1.1 V to 3.6 V |
| VCCB Supply Range | 1.1 V to 3.6 V |
| Data Rate | 100 Mbps |
| Direction Control | Automatic direction sensing |
| Signal Topology | Push-pull |
| ESD Protection (I/O) | +/-15 kV (IEC air-gap discharge) |
| Automotive Qualification | AEC-Q100 qualified |
| Operating Temperature | -40 C to +125 C |
| Package | 12-pin UQFN (RUT) |
| Mounting Type | Surface Mount |
| Polarity | Non-inverting |
| RoHS Status | Compliant |
| Output Type | Push-pull |
TXB0104W-Q1 Pin Configuration
| Pin 1 | VCCA — A-port supply voltage, 1.1 V to 3.6 V |
| Pin 2 | A1 — A-port data input/output 1 (tracks VCCA) |
| Pin 3 | A2 — A-port data input/output 2 (tracks VCCA) |
| Pin 4 | A3 — A-port data input/output 3 (tracks VCCA) |
| Pin 5 | A4 — A-port data input/output 4 (tracks VCCA) |
| Pin 6 | GND — Ground |
| Pin 7 | B4 — B-port data input/output 4 (tracks VCCB) |
| Pin 8 | B3 — B-port data input/output 3 (tracks VCCB) |
| Pin 9 | B2 — B-port data input/output 2 (tracks VCCB) |
| Pin 10 | B1 — B-port data input/output 1 (tracks VCCB) |
| Pin 11 | OE — Output enable; low three-states all I/Os |
| Pin 12 | VCCB — B-port supply voltage, up to 3.6 V |
Typical Applications
TXB0104W-Q1 is suitable for 6 applications: Automotive Body Electronics and Gateways, Infotainment and Display Interfaces, Battery Management and EV Systems, Industrial Control and PLC I/O Modules, Sensor Interface and Signal Conditioning, Networking and Communication Modules.
Automotive Body Electronics and Gateways
Automotive gateway ECUs routinely bridge 1.8 V microcontroller GPIO banks to 3.3 V sensor and actuator interfaces. The TXB0104W-Q1's extended VCCA range down to 1.1 V covers modern sub-1.8 V core-logic rails, and its AEC-Q100 qualification with -40 C to +125 C operation meets body-electronics environmental requirements. Its automatic direction sensing removes DIR pin firmware management on bidirectional lines such as UART links to telematics modules. With 100 Mbps support, SPI links between a gateway SoC and 3.3 V CAN/LIN transceivers shift without timing margin loss. The +/-15 kV ESD rating adds robustness against automotive load-dump transients coupled onto harness-connected lines, reducing the need for discrete TVS diodes on interior interfaces.
Recommended
Infotainment and Display Interfaces
Infotainment head units and cluster displays combine low-voltage SoCs with 3.3 V display serializers, touch controllers, and audio codecs. The TXB0104W-Q1 translates SPI and I2S-adjacent push-pull control signals at up to 100 Mbps, comfortably covering 50 MHz+ SPI clock rates to display deserializers. Its 12-pin UQFN (RUT) footprint of roughly 2 mm x 2 mm fits the dense board area behind instrument clusters. AEC-Q100 qualification addresses cabin and near-dashboard temperature extremes (-40 C to +125 C). Designers should note that the TXB push-pull topology is appropriate for I2S clock/data lines (push-pull) but not for open-drain touch-controller interrupt lines, where the TI TXS family is the correct choice per TI application guidance.
Recommended
Battery Management and EV Systems
EV battery management systems pair low-voltage cell-monitoring MCUs with 3.3 V CAN transceivers, isolation communication, and contactor drivers. The TXB0104W-Q1's wide VCCA range from 1.1 V supports the sub-1.8 V logic found on low-power BMS front ends, while VCCB connects to standard 3.3 V communication domains. Automatic direction sensing simplifies bidirectional UART links to isolated transceivers without additional control firmware. The +/-15 kV IEC ESD robustness and -40 C to +125 C AEC-Q100 operating range address the harsh electrical environment near traction cabling. Because TXB outputs are push-pull, designers must ensure CAN and LIN transceiver RxD/TxD pins driven through the translator are push-pull-compatible, using the TXS family instead where pull-ups dominate the bus topology.
Recommended
Industrial Control and PLC I/O Modules
Industrial PLC I/O cards mix 1.8 V/2.5 V FPGA or SoC banks with 3.3 V field-side buffers, ADCs, and optocoupler drivers. The TXB0104W-Q1 provides four auto-direction channels that eliminate per-pin direction registers, cutting firmware complexity on bidirectional status/control buses. The 100 Mbps rating supports high-speed parallel fieldbus and encoder interfaces, and the compact UQFN-12 fits high-density I/O card layouts. Although automotive-qualified, AEC-Q100 parts are widely reused in industrial designs for their -40 C to +125 C rating and reliability margin. Designers should decouple both rails with 0.1 uF ceramics placed within 2 mm of pins 1 and 12 and confirm that field-side drivers are push-pull; open-collector sensor inputs should route through the TXS family instead.
Recommended
Sensor Interface and Signal Conditioning
Precision sensor front ends often run analog and digital sections at different rails - for example, a 1.8 V ADC digital interface connected to a 3.3 V MCU. The TXB0104W-Q1 translates the SPI bus between them at full speed with four channels covering SCLK, MOSI, MISO, and CS in one package. Automatic direction sensing handles the bidirectional MISO/MOSI lines without DIR control. The W variant's 1.1 V minimum VCCA supports the newest low-voltage ADC digital cores. Because the device adds roughly nanosecond-scale propagation delay from its one-shot accelerators, SPI clock rates above 50 MHz should be validated on the actual PCB. Avoid using this part on open-drain ALERT or DRDY lines from sensors; route those through the TXS family or discrete FET shifters.
Recommended
Networking and Communication Modules
Networking modules - fiber-media converters, industrial Ethernet nodes, and wireless bridges - frequently combine 1.8 V PHY/MAC logic with 3.3 V magnetics-side circuitry, LEDs, and management MCUs. The TXB0104W-Q1 shifts management interfaces (MDIO-adjacent push-pull signals, UART console, status lines) at up to 100 Mbps while the auto-direction feature manages shared bidirectional pins without host intervention. Its +/-15 kV ESD tolerance on I/O gives extra margin on connector-proximate lines such as console ports. The -40 C to +125 C range suits temperature-hardened outdoor telecom enclosures. As with other TXB uses, verify push-pull topology on both sides; MDIO lines with pull-up resistors should instead use the TXS family to avoid drive contention documented in TI E2E forum guidance.
Recommended
Recommended Products Summary
Engineering reference data for TXB0104W-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TXB0104RUTR | TXU0104-Q1 | TXU0204-Q1 | TXU0304-Q1 | TXB0104QPWRQ1 |
|---|---|---|---|---|---|---|
| Package | 12-pin UQFN (RUT) | 12-pin UQFN (RUT) - same | 12-pin UQFN (RUT) - same | 12-pin UQFN (RUT) - same | 12-pin UQFN (RUT) - same | TSSOP-14 - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Automotive Qualification | AEC-Q100 qualified | No (commercial grade) | AEC-Q100 qualified | AEC-Q100 qualified | AEC-Q100 qualified | AEC-Q100 qualified |
| Direction Control | Automatic direction sensing | Automatic direction sensing | Fixed (VCCA to VCCB) | Fixed (2 in / 2 out) | Fixed (3 in / 1 out) | Automatic direction sensing |
| Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| Bus Topology Suitability | Push-pull only (not I2C/open-drain) | Push-pull only | Push-pull only | Push-pull only | Push-pull only | Push-pull only |
Key Differentiators
- Extended low-voltage VCCA range (vs TXB0104RUTR)
- Automatic direction sensing retained in automotive grade (vs TXU0104-Q1)
- Same-package trade-off: AEC-Q100 vs footprint (vs TXB0104QPWRQ1)
Design Notes
Place 0.1 uF ceramic decoupling capacitors within 2 mm of VCCA (pin 1) and VCCB (pin 12), each with a low-impedance via to the ground plane. The TXB auto-direction scheme uses one-shot edge accelerators that draw fast transient currents; supply droop during edges can cause output glitches or direction chatter. Keep A-side and B-side traces short (<50 mm) to limit reflected-edge retriggering, and avoid stubs on translated nets.
The TXB family is not recommended for open-drain buses such as I2C or 1-Wire - TI E2E forum threads document failed 1-Wire designs because the internal push-pull drivers contend with external pull-ups, corrupting data. Use the TXS0104E family for open-drain buses. Additionally, ensure VCCA ramps with or before VCCB during power-up; if VCCB is applied first, undefined states can occur until VCCA is valid. The OE pin should be held low until both rails are stable.
Estimated: as a CMOS logic translator, power dissipation is dominated by dynamic switching, approximately P = Cpd * f * V * I/O count. At 100 Mbps with 3.3 V swings and ~10 pF loads per channel, dissipation remains in the tens of milliwatts, far below the UQFN-12 package capability; no heatsink or thermal relief is required. However, the small 2 mm x 2 mm UQFN-12 has no exposed pad for heat extraction, so avoid stacking high-current routing under the device footprint.
Compliance Information
AEC-Q100 qualified for automotive applications per TI.com product page. RoHS/lead-free status per TI logic device standard; obtain formal certificates from TI quality documentation for the exact orderable suffix.
