TXS0108ERGYR - 8-Bit Bidirectional Level Shifter | Texas Instruments
MPN: TXS0108ERGYR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.89 | $0.89 |
| 10 | $0.8 | $8.00 |
| 100 | $0.65 | $65.00 |
| 500 | $0.55 | $275.00 |
| 1,000 | $0.45 | $450.00 |
| 3,000 | $0.4 | $1,200.00 |
TXS0108ERGYR Overview
A voltage-level translator, also called a level shifter, is a logic IC that enables communication between devices operating at different supply voltages, such as a 1.8V microcontroller interfacing with a 5V peripheral. Level translators sit within the broader logic IC family and are essential in any mixed-voltage embedded system. The TXS0108E requires no direction-control signal because its auto-direction sensing architecture detects data flow automatically, reducing MCU pin usage and firmware complexity.
Key features include VCC isolation, which places all outputs in high-impedance if either supply is at GND; no power-supply sequencing requirement, since either VCCA or VCCB can ramp first; and a one-shot edge-rate accelerator that boosts rise times to achieve the 110Mbps push-pull data rate. The transistor-based pass-gate architecture supports both open-drain buses such as I2C and push-pull interfaces such as SPI and UART without configuration.
Typical applications include I2C, SPI, and UART level shifting between low-voltage MCUs (1.8V/2.5V/3.3V) and 5V peripherals, SD card and SIM card interfaces, and general-purpose GPIO translation in industrial and consumer systems. As of 2026-08-30, pricing starts at approximately $0.60-$0.90 at 1-piece quantity from authorized distributors.
Design tip: always keep VCCA <= VCCB, place 0.1uF and 10uF decoupling capacitors close to both supply pins, and use external pull-up resistors on both sides for open-drain operation.
Drop-in alternatives for TXS0108ERGYR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TXS0108ENMER
✅ Drop-In📋 Reference alternative (not in catalog)
TXB0108RGYR
⚡ Same Package📋 Reference alternative (not in catalog)
TXS0108ERGYT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TXS0108ERGYR Maximum Ratings & Electrical Characteristics
| Function | 8-bit bidirectional voltage-level translator |
| VCCA Supply Range | 1.4 V to 3.6 V |
| VCCB Supply Range | 1.65 V to 5.5 V |
| Max Data Rate (Push-Pull) | 110 Mbps |
| Max Data Rate (Open-Drain) | 1.2 Mbps |
| Direction Control | Not required (auto-direction sensing) |
| Channels | 8 bidirectional |
| Package | VQFN-20 (RGY) 3.5 x 4.5 mm |
| Operating Temperature | -40C to +85C |
| Supply Sequencing | Not required (either VCCA or VCCB can ramp first) |
| VCC Isolation | All outputs high-impedance if either VCC is at GND |
| Mounting Type | Surface Mount |
| Pins | 20 |
| Architecture | Pass-gate with one-shot edge-rate accelerator |
| Applications | Open-drain and push-pull (I2C, SPI, UART, GPIO) |
TXS0108ERGYR Pin Configuration
| Pin 1 | A1 — A-port data 1 (low-voltage side) |
| Pin 2 | VCCA — A-port supply, 1.4V to 3.6V |
| Pin 3 | GND — Ground |
| Pin 4 | B1 — B-port data 1 (high-voltage side) |
| Pin 5 | B2 — B-port data 2 |
| Pin 6 | B3 — B-port data 3 |
| Pin 7 | B4 — B-port data 4 |
| Pin 8 | B5 — B-port data 5 |
| Pin 9 | B6 — B-port data 6 |
| Pin 10 | B7 — B-port data 7 |
| Pin 11 | B8 — B-port data 8 |
| Pin 12 | OE — Output enable, active high; low tri-states all I/Os |
| Pin 13 | A8 — A-port data 8 |
| Pin 14 | A7 — A-port data 7 |
| Pin 15 | A6 — A-port data 6 |
| Pin 16 | A5 — A-port data 5 |
| Pin 17 | A4 — A-port data 4 |
| Pin 18 | A3 — A-port data 3 |
| Pin 19 | A2 — A-port data 2 |
| Pin 20 | VCCB — B-port supply, 1.65V to 5.5V |
Typical Applications
TXS0108ERGYR is suitable for 6 applications: I2C Bus Level Shifting, SPI Interface Translation, SD Card and eMMC Interfaces, UART Communication Bridges, General-Purpose GPIO Expansion, Industrial Automation Control.
I2C Bus Level Shifting
The TXS0108ERGYR fits I2C level translation because its pass-gate architecture does not drive the bus push-pull, avoiding contention with external pull-up resistors. Its 1.2Mbps open-drain rating covers Standard, Fast, and Fast-Plus modes. With VCCA at 1.8V or 3.3V and VCCB at 5V, a single 20-pin VQFN bridges an MCU to 5V EEPROMs or sensors. TI recommends external pull-ups on both sides; the one-shot accelerator restores fast edges despite large RC loads.
Recommended
SPI Interface Translation
For SPI, the TXS0108ERGYR's 110Mbps push-pull rating far exceeds typical SPI clock rates (10-50MHz), providing ample timing margin. Its auto-direction sensing removes the need for a DIR control pin even with bidirectional MOSI/MISO sharing, simplifying routing between a 1.8V MCU and 3.3V or 5V flash, ADCs, or displays. VCC isolation keeps outputs high-impedance during power ramps, protecting flash memory content during brownouts.
Recommended
SD Card and eMMC Interfaces
SD cards transition from 3.3V initialization signaling to 1.8V UHS-I operation, and the TXS0108ERGYR handles both directions within its 1.4V-3.6V / 1.65V-5.5V ranges. The 110Mbps push-pull rate supports high-speed CMD/DAT lines, while the no-sequencing requirement eases hot-plug power design. Place the translator close to the card socket and keep DAT lines matched in length to preserve signal integrity at high clock rates.
Recommended
UART Communication Bridges
UART links between a low-voltage MCU and 5V peripherals (legacy RS-232 transceivers, GPS modules, industrial sensors) use the TXS0108ERGYR's push-pull mode. Typical UART rates up to 3Mbps are well within the 110Mbps capability. Auto-direction sensing is essential because UART TX/RX are point-to-point; each channel translates independently without firmware control. The -40C to +85C rating suits industrial enclosures.
Recommended
General-Purpose GPIO Expansion
The 8-bit width makes the TXS0108ERGYR efficient for translating mixed-voltage GPIO banks - interrupts, enables, status lines - between 1.8V SoCs and 3.3V/5V boards. One package replaces eight discrete two-transistor shift circuits, saving board area with the compact 3.5x4.5mm VQFN. The OE pin tri-states all I/Os for safe board-level test and low-power states, and either supply can power up first.
Recommended
Industrial Automation Control
In factory systems, 3.3V controllers must interface with 5V PLC I/O, sensors, and actuators. The TXS0108ERGYR's -40C to +85C range, VCC isolation on brownout, and no-sequencing power-up provide the robustness automation demands. Its 1.2Mbps open-drain support also handles fieldbus-style open-collector signaling. Designers should verify ground potential equalization across cable runs and add TVS protection on lines leaving the enclosure.
Recommended
Recommended Products Summary
Engineering reference data for TXS0108ERGYR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TXS0108ENMER | TXB0108RGYR | TXS0108EPWR |
|---|---|---|---|---|
| Package | VQFN-20 (RGY) 3.5x4.5mm | VQFN-20 (RGY) - same | VQFN-20 (RGY) - same | TSSOP-20 (PW) - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Bits / Channels | 8 bidirectional | 8 bidirectional | 8 bidirectional | 8 bidirectional |
| Max Data Rate (Push-Pull) | 110 Mbps | 110 Mbps | 100 Mbps | 110 Mbps |
| Open-Drain / I2C Support | Yes (1.2 Mbps) | Yes (1.2 Mbps) | No (push-pull only) | Yes (1.2 Mbps) |
| Direction Control | Not required (auto-direction) | Not required | Not required | Not required |
| VCCA / VCCB Range | 1.4-3.6V / 1.65-5.5V | 1.4-3.6V / 1.65-5.5V | 1.2-3.6V / 1.65-5.5V | 1.4-3.6V / 1.65-5.5V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Open-drain bus support (I2C compatible) (vs TXB0108RGYR)
- Auto-direction sensing with no control pin (vs 74LVC8T245-style translators)
- VCC isolation and no supply sequencing (vs TXB0108RGYR)
Design Notes
Place 0.1uF ceramic decoupling capacitors within 2mm of both VCCA (pin 2) and VCCB (pin 20), plus one bulk 10uF per supply rail. Keep the VQFN-20 center thermal pad connected to GND with a via array. Short, direct traces on A/B channels reduce the chance of the one-shot edge accelerator mis-triggering on reflections.
The TXS0108E has internal 10kΩ (A-side) and 4kΩ (B-side) pulldowns; weak external pull-ups below a few kΩ or tri-stated drivers can create undefined levels and oscillation. For I2C, size external pull-ups considering these internal resistances. Always maintain VCCA <= VCCB, and tie OE through a pull-down so outputs stay tri-stated until supplies are stable.
For push-pull rates above 50Mbps, match channel trace lengths and keep stubs under 10mm. The one-shot accelerator briefly boosts drive strength, so unterminated long lines can ring; add series termination (22-33Ω) near the translator if overshoot exceeds 0.3V beyond the rail. Consult TI datasheet TXS0108E application section for layout examples.
Compliance Information
RoHS/REACH details not present in provided verified data - marked unknown; see TI product page for current compliance certificates. Automotive users should select TXS0108EQPWRQ1 (AEC-Q100).
