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Home > Products > Integrated Circuits (ICs) > Interface > I/O Expanders

Diodes Incorporated PI4IOE5V6416ALEX

Name: PI4IOE5V6416ALEX
Brand: Diodes Incorporated
SKU: PI4IOE5V6416ALEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI4IOE5V6416ALEX

Manufacturer:: Diodes Incorporated

Category:: I/O Expanders

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI4IOE5V6416ALEX.pdf

Description:: INTERFACE IO EXPANDER TSSOP-24 T

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Product details

Overview

PI4IOE5V6416ALEX from Diodes Incorporated is a 16-bit I²C-bus I/O expander with bidirectional voltage-level translation, supporting independent 1.65 V–5.5 V operation on both GPIO port (V_DD(P)) and I²C bus (V_{DD(I2C_bus)}) sides. It features programmable push-pull/open-drain outputs, active-low interrupt output, and power-on reset. Used in battery-powered mobile devices to interface sensors, keypads, and push buttons while minimizing interconnects.

For engineers reviewing the PI4IOE5V6416ALEX datasheet, PI4IOE5V6416ALEX pinout, PI4IOE5V6416ALEX application, or PI4IOE5V6416ALEX equivalent, this device delivers verified I²C Fast Mode (400 kHz) timing compliance, per-pin output drive strength control (four levels), interrupt masking per GPIO, and dual-supply rail flexibility critical for mixed-voltage embedded systems.

Technical Context

The PI4IOE5V6416ALEX implements a register-mapped I²C slave architecture with two 8-bit I/O ports (P0_0–P0_7 and P1_0–P1_7), each configurable as input or output via dedicated Configuration registers (06h/07h). All 16 GPIOs support independent polarity inversion (04h/05h), input latching (44h/45h), and interrupt masking (4Ah/4Bh).

Its dual-supply design isolates V_DD(P) (GPIO side) from V_{DD(I2C_bus)} (SCL/SDA side), enabling true bidirectional level translation without external translators. The INT pin asserts low on unmasked input state changes relative to the Input Port register value, with interrupt status readable at 4Ch/4Dh.

Key Specifications

Parameter	Value and Actual Design Meaning
I²C Bus Speed	400 kHz Fast Mode - supports high-speed peripheral expansion without clock stretching bottlenecks.
V_DD(P) Range	1.65 V to 5.5 V - enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V microcontrollers and sensors.
V_{DD(I2C_bus)} Range	1.65 V to 5.5 V - decouples I²C master supply from GPIO domain, eliminating need for external level shifters.
Standby Current	1.5 μA typical at 5 V - extends battery life in always-on sensor monitoring applications.
Output Drive Strength	Four programmable levels (0.25× to 1.0× full drive) per GPIO - optimizes signal integrity and EMI across varying load capacitances.
Interrupt Logic	Active-low open-drain INT with per-pin mask control - allows selective wake-up of host MCU from deep sleep using only relevant inputs.
Power-On Reset	VPOR threshold 1.1–1.4 V rising - ensures deterministic I/O initialization and prevents glitch-induced misconfiguration during brown-out recovery.

Pinout & Package

PI4IOE5V6416ALEX is available in a lead-free, RoHS-compliant 24-pin TQFN (ZD) package (3.0 mm × 3.0 mm, 0.5 mm pitch) with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
INT	Interrupt output	Open-drain active-low signal indicating unmasked GPIO state change; requires external pull-up to V_{DD(I2C_bus)} or V_DD(P).
V_{DD(I2C_bus)}	I²C bus supply	Sets logic thresholds for SCL/SDA/RESET pins; defines high-level reference for I²C communication and level translation.
RESET	Active-low reset input	Asynchronous hardware reset that clears all configuration and I/O direction registers to power-on defaults.
P0_0–P0_7, P1_0–P1_7	Configurable GPIOs	16 bidirectional I/Os individually settable as input/output via Configuration registers; support internal pull-up/down enable and selection.
ADDR	Hardware address select	Two possible I²C slave addresses (0x20 or 0x21) determined by logic level on this pin; enables up to two devices on same bus.
SCL / SDA	I²C serial interface	Compliant with Standard (100 kHz) and Fast (400 kHz) modes; require external pull-ups to V_{DD(I2C_bus)}.
V_DD(P)	GPIO port supply	Sets logic thresholds and output drive voltage for all 16 GPIOs; independent of I²C bus supply.

Key Features

Feature	Design Value
Bidirectional voltage-level translation	Eliminates external level shifters when interfacing 1.8 V microcontrollers with 3.3 V or 5 V peripherals via I²C.
Per-GPIO interrupt masking	Reduces false wake-ups by disabling interrupts on unused or noise-prone inputs (e.g., mechanical switches with bounce).
Programmable output drive strength	Four current levels per pin allow optimization of rise/fall times and EMI for different trace lengths and capacitive loads.
Input latch control	Enables edge-capture behavior on selected GPIOs-critical for debounced button detection and pulse-width measurement in firmware.
Internal pull-up/pull-down enable & selection	Reduces BOM count by replacing external resistors; configurable per-pin to match signal termination requirements.

Applications

Smartphone Keypad Interface

Industrial Sensor Hub

Use Scenario: Expanding GPIO count on an application processor to scan a 4×4 membrane keypad in a compact smartphone design.

IC Role / Device Role / Timing Role: I/O expander providing 16 configurable pins with interrupt-driven keypress detection and programmable drive strength for reliable contact closure sensing.

Use Value: Reduces interconnect count by 12+ lines versus direct routing; enables low-power wake-on-keypress using masked INT signal.

Use Scenario: Aggregating analog and digital sensor signals (temperature, humidity, motion) in a factory-floor environmental monitor.

IC Role / Device Role / Timing Role: Remote I/O node translating mixed-voltage sensor interfaces (1.8 V I²C sensors + 3.3 V digital inputs) to a single 3.3 V host MCU bus.

Use Value: Eliminates six discrete level shifters; leverages per-pin interrupt masking to trigger host only on critical alarm conditions.

Wearable Health Band

Automotive Cabin Control Panel

Use Scenario: Managing push-button inputs, LED indicators, and biometric sensor enable lines in a space-constrained wearable with tight battery budget.

IC Role / Device Role / Timing Role: Low-quiescent-current I/O expander (1.5 μA standby) with programmable GPIO pull configurations and fast 400 kHz I²C access for real-time sensor control.

Use Value: Cuts system standby current by >30% versus discrete GPIO solutions; internal pull resistors reduce component count and board area.

Use Scenario: Driving backlight LEDs and reading tactile switch states in a vehicle infotainment control panel operating across automotive temperature range.

IC Role / Device Role / Timing Role: Robust I/O expander rated for –40°C to +85°C with latch-up immunity (>100 mA), power-on reset, and ESD-hardened I/Os (2 kV HBM).

Use Value: Ensures reliable startup and fault resilience in harsh electrical environments; eliminates need for external reset supervisor IC.

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/O expansion applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TCA6424A	24-bit I/O, 3.3 V only V_DD, no dual-supply translation, fixed 25 mA output drive	Lacks bidirectional level translation; requires external translators for mixed-voltage systems	Select when higher I/O count is needed and all rails are 3.3 V; avoid where 1.8 V/5 V coexistence exists.
PCA9555	16-bit, 2.3–5.5 V operation, no per-pin drive strength control, no input latch register	Supports only global pull-up configuration; interrupt cannot be masked per pin	Choose for cost-sensitive legacy designs where per-GPIO configurability is unnecessary and interrupt filtering is handled in firmware.

Compared with TCA6424A and PCA9555, PI4IOE5V6416ALEX uniquely delivers independent dual-rail operation, per-pin drive tuning, and hardware-based interrupt masking-enabling lower system BOM, reduced firmware complexity, and robust mixed-voltage interoperability.

Availability

PI4IOE5V6416ALEX is available at Aetrix Electronics and suitable for battery-powered portable electronics, industrial sensor nodes, and automotive cabin controls requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI4IOE5V6416ALEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient components for power management, signal integrity, and connectivity applications.

The PI4IOE5V6416ALEX belongs to Diodes' I/O expansion product line, designed specifically to simplify mixed-voltage system integration in space- and power-constrained embedded applications such as wearables, IoT endpoints, and automotive human-machine interfaces.

FAQ

What is the maximum I²C clock frequency supported by PI4IOE5V6416ALEX?

The PI4IOE5V6416ALEX fully complies with I²C Fast Mode at 400 kHz, with validated timing margins across its entire operating voltage range (1.65 V–5.5 V) and temperature range (–40°C to +85°C). It does not support High-Speed Mode (3.4 MHz); attempting to exceed 400 kHz may result in data corruption or loss of ACK.

Can PI4IOE5V6416ALEX translate between 1.8 V and 5 V logic domains?

Yes - V_{DD(I2C_bus)} can be set to 1.8 V while V_DD(P) is set to 5 V, enabling bidirectional signal translation between a 1.8 V I²C master and 5 V GPIO peripherals. The device's input thresholds scale with respective supplies, and output drive is referenced to V_DD(P), ensuring valid logic levels on both sides.

How is the I²C slave address configured on PI4IOE5V6416ALEX?

The ADDR pin determines the 7-bit I²C slave address: tied to V_DD(P) yields 0x21; tied to GND yields 0x20. This allows two identical devices to share one I²C bus without address conflict. No software address programming is required - configuration is purely hardware-based and persistent across power cycles.

Does PI4IOE5V6416ALEX support hot insertion or live I²C bus connection?

No - the device lacks hot-swap protection circuitry. Connecting or disconnecting the PI4IOE5V6416ALEX while the I²C bus is powered may cause bus contention or transient glitches. Power sequencing must ensure V_{DD(I2C_bus)} and V_DD(P) are stable before initiating I²C communication, and RESET should be asserted during power ramp-up.

PI4IOE5V6416ALEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Number of I/O:: 16

Interface:: I2C

Interrupt Output:: Yes

Features:: POR

Output Type:: Open Drain, Push-Pull

Current - Output Source/Sink:: 10mA, 25mA

Clock Frequency:: 400 kHz

Voltage - Supply:: 1.65V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP

PI4IOE5V6416ALEX FAQ

1.How can I place an order for PI4IOE5V6416ALEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI4IOE5V6416ALEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PI4IOE5V6416ALEX reliable?

The price and inventory of PI4IOE5V6416ALEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI4IOE5V6416ALEX is usually 5 days.

3.What payment methods are accepted for PI4IOE5V6416ALEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI4IOE5V6416ALEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI4IOE5V6416ALEX?

PI4IOE5V6416ALEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI4IOE5V6416ALEX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PI4IOE5V6416ALEX?

For technical support, including PI4IOE5V6416ALEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI4IOE5V6416ALEX requirements.

6.How does Aetrix verify that PI4IOE5V6416ALEX is sourced from the original manufacturer or authorized distributors?

All PI4IOE5V6416ALEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI4IOE5V6416ALEX meets industry standards.

7.What is the process for return or replacement of PI4IOE5V6416ALEX?

All PI4IOE5V6416ALEX units undergo pre-shipment inspection (PSI). If there is an issue with PI4IOE5V6416ALEX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PI4IOE5V6416ALEX part is unused and in its original packaging.

Return procedure for PI4IOE5V6416ALEX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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