component
TCA9406
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TI dual bidirectional I2C level translator, VSSOP-8. 1.1-3.6 V to 1.65-5.5 V, output enable. Datasheet-verified.
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Datasheet
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README
markdownTCA9406
Texas Instruments · Level translator · VSSOP-8
Translates the two lines of an I2C or SMBus bus between a lower and a higher voltage domain, so a controller at 1.2 or 1.8 V talks to 3.3 or 5 V devices on the same open-drain bus. Each channel handles the bidirectional traffic automatically, VCCA and VCCB set the two sides, and an OE pin isolates the buses when low. It is the level-shifter to reach for when a modern low-voltage SoC must share an I2C bus with higher-voltage peripherals.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SDA_B | bidirectional | I²C/SMBus data line on the B-port side. Referenced to VCCB (2.3 V to 5.5 V). Open-drain with an internal 10-kΩ pullup to VCCB. |
| 2 | GND | power_in | Device ground reference (0 V). |
| 3 | VCCA | power_in | A-port supply voltage. Operating range 1.65 V ≤ VCCA ≤ 3.6 V and VCCA ≤ VCCB. Sets the logic reference level for the A-side I/Os and OE. |
| 4 | SDA_A | bidirectional | I²C/SMBus data line on the A-port side. Referenced to VCCA (1.65 V to 3.6 V). Open-drain with an internal 10-kΩ pullup to VCCA. |
| 5 | SCL_A | bidirectional | I²C/SMBus clock line on the A-port side. Referenced to VCCA (1.65 V to 3.6 V). Open-drain with an internal 10-kΩ pullup to VCCA. |
| 6 | OE | input | Output enable, active High. Pull OE low to place all SDA/SCL outputs in the high-impedance (3-state) mode. Referenced to VCCA; VCCA-tolerant and also 5.5-V tolerant. May be tied directly to VCCA. |
| 7 | VCCB | power_in | B-port supply voltage. Operating range 2.3 V ≤ VCCB ≤ 5.5 V. Sets the logic reference level for the B-side I/Os. Either VCCA or VCCB may be ramped first (no supply sequencing required). |
| 8 | SCL_B | bidirectional | I²C/SMBus clock line on the B-port side. Referenced to VCCB (2.3 V to 5.5 V). Open-drain with an internal 10-kΩ pullup to VCCB. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Dual bidirectional I2C/SMBus level translator |
| A side | 1.1-3.6 V |
| B side | 1.65-5.5 V |
| Channels | 2 (SDA, SCL) |
| Direction control | None (auto, open-drain) |
| Enable | OE isolates buses |
| Package | VSSOP-8 |
Ordering variants
Same part, different packaging or reel option.
TCA9406DCUR (VSSOP-8)TCA9406YZPR (DSBGA-8)
CAD (KiCad official)
- Symbol:
Interface:TCA9406DC (KiCad official) - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files:
tca9406-etched.step/tca9406-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tca9406.step/tca9406.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (38 pp, sha256
fdb80d682fbacd5e, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).