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TCA39306-Q1
  • TCA39306-Q1
  • TCA39306-Q1
  • TCA39306-Q1

TCA39306-Q1

ACTIVE

Automotive FM+ I²C bus and SMBus voltage translator

Texas Instruments TCA39306-Q1 Product Info

1 April 2026 3

Parameters

Features

Enable pin

Protocols

I2C, I3C

Frequency (max) (MHz)

12.5

VCCA (min) (V)

0.85

VCCA (max) (V)

5.5

VCCB (min) (V)

1.65

VCCB (max) (V)

5.5

Supply restrictions

VCCA <= VCCB

Rating

Automotive

TI functional safety category

Functional Safety-Capable

Operating temperature range (°C)

-40 to 125

Package

VSSOP (DCU)-8-6.2 mm² 2 x 3.1

Features

  • AEC-Q100 Qualified for automotive applications
  • Functional Safety-Capable
  • 2-Bit bidirectional translator for SDA and SCL lines in mixed-mode I 2C applications
  • Standard-mode, fast-mode, and fast-mode plus I 2C and SMBus compatible
  • I 3C compatible (12.5 MHz supported)
  • Allows voltage-level translation between
    • 0.9-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.2-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.8-V V REF1 and 2.5-V, 3.3-V, or 5-V V REF2
    • 2.5-V V REF1 and 3.3-V or 5-V V REF2
    • 3.3-V V REF1 and 5-V V REF2
  • Provides bidirectional voltage translation with no direction Pin
  • Low ON-state resistance between input and output ports provides less signal distortion
  • Open-drain I 2C I/O ports (SCL1, SDA1, SCL2, and SDA2)
  • 5-V Tolerant I 2C I/O ports to support mixed-mode signal operation
  • High-impedance SCL1, SDA1, SCL2, and SDA2 pins for EN = Low
  • Lockup-free operation for isolation when EN = Low
  • Flow-through pinout for ease of printed-circuit-board trace routing
  • ESD Protection Exceeds JESD 22
    • 2000-V human-body model (A114-A)
    • 1000-V charged-device model (C101)
  • AEC-Q100 Qualified for automotive applications
  • Functional Safety-Capable
  • 2-Bit bidirectional translator for SDA and SCL lines in mixed-mode I 2C applications
  • Standard-mode, fast-mode, and fast-mode plus I 2C and SMBus compatible
  • I 3C compatible (12.5 MHz supported)
  • Allows voltage-level translation between
    • 0.9-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.2-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.8-V V REF1 and 2.5-V, 3.3-V, or 5-V V REF2
    • 2.5-V V REF1 and 3.3-V or 5-V V REF2
    • 3.3-V V REF1 and 5-V V REF2
  • Provides bidirectional voltage translation with no direction Pin
  • Low ON-state resistance between input and output ports provides less signal distortion
  • Open-drain I 2C I/O ports (SCL1, SDA1, SCL2, and SDA2)
  • 5-V Tolerant I 2C I/O ports to support mixed-mode signal operation
  • High-impedance SCL1, SDA1, SCL2, and SDA2 pins for EN = Low
  • Lockup-free operation for isolation when EN = Low
  • Flow-through pinout for ease of printed-circuit-board trace routing
  • ESD Protection Exceeds JESD 22
    • 2000-V human-body model (A114-A)
    • 1000-V charged-device model (C101)

Description

The TCA39306-Q1 is a dual bidirectional voltage-level translator compatible with I 2C, SMBus, and I 3C with an enable (EN) input, and is operational from 0.9-V to 3.3-V V REF1 and 1.8-V to 5.5-V V REF2.

The device allows bidirectional voltage translations between 0.85 V and 5 V, without the use of a direction pin. The low ON-state resistance (R ON) of the switch allows connections to be made with minimal propagation delay. When EN is high, the translator switch is ON, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is low, the translator switch is off, and a high-impedance state exists between ports.

In addition to voltage translation, the TCA39306-Q1 can be used to isolate a higher speed bus from a lower speed bus by controlling the EN pin to disconnect the slower bus during fast-mode communication.

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