Diodes Incorporated
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Low-voltage translating 8-bit I2C-bus I/O Expander

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The DIODES PI4IOE5V6408 is an 8-bit general-purpose I/O expander that provides remote I/O expansion for most microcontroller families via the I2 C-bus interface. It provides a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in battery-powered mobile applications for interfacing to sensors, push buttons, keypad, etc.

It can operate from 1.65V to 4V on the GPIO-port side and 1.65V to 3.6V on the SDA/SCL side. This allows the PI4IOE5V6408 to interface with next generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power.

The bidirectional voltage-level translation in the PI4IOE5V6408 is provided through VDD(I2C_bus). VDD(I2C_bus) should be connected to the VDD of the external SCL/SDA lines. The voltage level on the GPIO-port of the PI4IOE5V6408 is determined by VDD(P).

At power on, the I/Os are configured as inputs; however, the system master can enable the I/Os as either inputs or outputs by writing to the I/O direction bits. The data for each input or output is kept in the corresponding Input or Output register. All registers can be read by the system master.

The PI4IOE5V6408 has open-drain interrupt (INT) output pin that goes LOW when the input state of a GPIO-port changes from the input-state default register value. The device also has an interrupt masking feature by which the user can mask the interrupt from an individual GPIO-port.


  • Operation power supply voltage from 1.65V to 4.0V
  • Allows bidirectional voltage-level translation and GPIO expansion between:
    • 8V SCL/SDA and 1.8V, 2.5V, 3.3V Port P
    • 5V SCL/SDA and 1.8V, 2.5V, 3.3V Port P
    • 3V SCL/SDA and 1.8V, 2.5V, 3.3V Port P
  • Low standby current consumption:
    • 5 μA typical at 3.3 V VDD
  • 1MHz I2 C-bus interface
  • Compliant with the I2C-bus Fast and Standard modes
  • Programmable Pull-up/Pull-down Resistors for GPIO Inputs
  • Software Reset
  • Active LOW open-drain interrupt output
  • Low standby current
  • Latch-up tested (exceeds 100mA)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
  • Packaging (Pb-free & Green): 16-Pin, UQFN1.8 x2.6


  • Server
  • Storage
  • Networking

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Analog or Digital? Digital
Voltage 1.65/3.6V
Single Ended Channels 8
Signal Type Single Ended
Configuration 8 bits
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents


Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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