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

Diodes Incorporated PI4IOE5V6524ZHEX

Name: PI4IOE5V6524ZHEX
Brand: Diodes Incorporated
SKU: PI4IOE5V6524ZHEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI4IOE5V6524ZHEX

Manufacturer:: Diodes Incorporated

Category:: I/O Expanders

Package:: 32-VFQFN Exposed Pad

Datasheet:: PI4IOE5V6524ZHEX.pdf

Description:: INTERFACE IO EXPANDER W-QFN5050-

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Product details

Overview

PI4IOE5V6524 from Diodes Incorporated is a 24-bit I²C-bus I/O expander with bidirectional voltage-level translation, supporting 0.8–3.6 V on the I²C side and 1.65–5.5 V on the GPIO port side. It provides programmable push-pull or open-drain outputs, per-pin interrupt masking, hardware switch debounce, and latched outputs capable of directly driving LEDs. Used in battery-powered mobile devices for sensor, keypad, and push-button interfacing.

For engineers reviewing the PI4IOE5V6524 datasheet, PI4IOE5V6524 pinout, PI4IOE5V6524 application, or PI4IOE5V6524 equivalent, key selection considerations include its dual-supply rail operation, 1 MHz Fast-mode Plus I²C interface, 24 configurable GPIOs with individual drive strength control (4 levels), interrupt edge specification per bit, and 5.5 V-tolerant I/O ports.

Technical Context

The PI4IOE5V6524 implements a register-mapped I²C slave architecture with triple-register groups (e.g., Input/Output/Polarity registers per port bank) and dedicated configuration registers for output drive strength (40h–45h), interrupt edge (60h–65h), and individual pin output mode (5Ch). Its internal logic supports software reset via General Call address 00h followed by byte 06h.

Voltage translation is achieved through separate V_DD(I²C-bus) and V_DD(P) supplies, enabling interoperability between sub-1 V microcontrollers and 5 V peripherals. The INT̅̅̅̅̅ pin asserts low on GPIO state change versus default input-state register value, with maskable per-pin sensitivity and individual interrupt clear capability without disturbing other pending events.

Key Specifications

Parameter	Value and Actual Design Meaning
I²C Bus Voltage Range	0.8 V to 3.6 V - Enables direct interface with ultra-low-voltage processors (e.g., 0.8 V core rails) while maintaining Fast-mode Plus (1 MHz) timing compliance.
GPIO Port Voltage Range	1.65 V to 5.5 V - Supports legacy 3.3 V/5 V peripherals and modern 1.8 V sensors without external level shifters.
I²C Interface Speed	Up to 1 MHz (Fast-mode Plus) - Doubles data throughput vs. standard Fast-mode (400 kHz), reducing I/O configuration latency in high-speed systems.
Standby Current	2 μA typical at 3.3 V V_DD(P) - Minimizes quiescent power in always-on battery-operated devices such as wearables and IoT endpoints.
I/O Drive Strength	4 programmable levels (2.5–10 mA) - Allows precise rise/fall time control in low-capacitance PCB layouts, reducing EMI and signal integrity issues.
Interrupt Capability	Per-pin maskable, edge-selectable, and individually clearable interrupts - Enables selective event handling without polling or clearing unrelated status bits.
Input/Output Tolerance	5.5 V tolerant GPIOs, 3.6 V tolerant I²C pins - Eliminates need for external clamping diodes when interfacing mixed-voltage subsystems.

Pinout & Package

Package: 32-pin TQFN (5 mm × 5 mm, 0.5 mm pitch), RoHS-compliant, halogen- and antimony-free "Green" construction.

Pin/Terminal	Circuit Role	Design Meaning
VDD(I2C-bus)	I²C supply & level translation reference	Must connect to master's V_DD; sets SCL/SDA logic thresholds and enables bidirectional voltage translation.
VDD(P)	GPIO port supply rail	Determines output high voltage and input threshold for all 24 GPIOs (P0_0–P2_7); independent of I²C rail.
SCL / SDA	I²C serial clock/data bus	Open-drain, 3.6 V tolerant; require external pull-ups to VDD(I2C-bus); support 1 MHz Fast-mode Plus signaling.
INT̅̅̅̅̅	Active-low interrupt output	Open-drain, 3.6 V tolerant; asserts low on masked/unmasked GPIO state change; requires external pull-up.
RESET̅̅̅̅̅̅̅̅̅	Active-low hardware reset	Asynchronous reset that forces all I/Os to input state and clears internal registers to power-on defaults.
ADDR	Hardware slave address select	Configures one of four I²C addresses (40h–46h) by connecting to VSS, VDD, SCL, or SDA - enables multi-device I²C bus sharing.
P0_0–P2_7	24-bit configurable GPIO bank	Three 8-bit ports (P0, P1, P2); each pin supports input latch, pull-up/pull-down enable (100 kΩ), and programmable drive strength.

Key Features

Feature	Design Value
Bidirectional voltage-level translation	Eliminates external level shifters between 0.8 V microcontrollers and 5 V peripherals using independent V_DD(I²C-bus) and V_DD(P) supplies.
Per-pin interrupt configuration	Each of 24 GPIOs can be individually masked, edge-triggered (rising/falling), and cleared without affecting other interrupt sources - critical for deterministic real-time response.
Hardware switch debounce	Dedicated debounce circuitry per GPIO reduces firmware overhead and eliminates need for software debouncing loops or external RC filters in mechanical switch interfaces.
Latched outputs for LED drive	Push-pull outputs sustain stable current (up to 10 mA per pin, 100 mA per octal bank) - enables direct connection to indicator LEDs without external drivers.
Software Device ID & Reset	Supports I²C General Call reset (00h + 06h) and device identification via dedicated register - simplifies system initialization and diagnostics in multi-expander designs.

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 GPIOs with hardware debounce and per-key interrupt masking to reduce host CPU wakeups.

Use Value: Reduces BOM cost and PCB area by eliminating discrete debounce components and enabling low-power idle states with interrupt-driven wakeups.

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 3.3 V sensor logic to 1.2 V MCU I²C bus while providing interrupt-on-threshold-change capability.

Use Value: Enables single I²C bus to manage 24 heterogeneous sensors with deterministic interrupt latency and no voltage translation ICs.

Wearable Health Band

Automotive Cabin Control Panel

Use Scenario: Managing push buttons, LED indicators, and capacitive touch inputs in a coin-cell-powered fitness tracker.

IC Role / Device Role / Timing Role: Low-quiescent-current (2 μA) I/O expander with 1.8 V GPIO compatibility and latched LED drive outputs.

Use Value: Extends battery life beyond 6 months by minimizing standby current and eliminating external LED drivers.

Use Scenario: Controlling backlight dimming, button feedback, and status LEDs on a vehicle infotainment panel with mixed 5 V and 3.3 V subsystems.

IC Role / Device Role / Timing Role: Robust I/O expander with 5.5 V-tolerant ports and AEC-Q200-aligned reliability features (latch-up >100 mA).

Use Value: Simplifies design validation by meeting automotive voltage tolerance requirements without additional protection circuitry.

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 I²C expander with identical pin count but no built-in voltage translation; requires external level shifters for mixed-voltage buses.	Lacks per-pin interrupt edge control and hardware debounce; supports only 1.65–5.5 V on all rails - unsuitable for sub-1 V masters.	Select when system uses uniform 3.3 V rails and firmware handles debounce; avoid when interfacing 0.8 V processors or requiring low-latency interrupt masking.
PCA9555D	16-bit I²C expander with fixed 2.3–5.5 V operation; no GPIO voltage translation, no programmable drive strength, no hardware debounce.	Offers only basic input/output functionality; interrupt output is bank-level (not per-pin), limiting granularity in multi-sensor systems.	Choose for cost-sensitive, low-channel-count applications where advanced features like per-pin masking or drive tuning are unnecessary.

Compared with TCA6424A and PCA9555D, the PI4IOE5V6524 uniquely integrates bidirectional voltage translation, per-pin interrupt edge control, and hardware debounce - enabling simpler, lower-power, and more responsive I/O expansion in mixed-voltage embedded systems.

Availability

PI4IOE5V6524 is available at Aetrix Electronics and suitable for smartphone keypad interfaces, industrial sensor hubs, wearable health bands, and automotive cabin control panels requiring stable component supply across long production lifecycles.

Supply support for PI4IOE5V6524 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The PI4IOE5V6524 belongs to Diodes' I/O expansion product line, designed specifically for low-power, mixed-voltage embedded systems requiring robust GPIO extension with minimal external components and deterministic interrupt behavior.

FAQ

What is the maximum I²C clock frequency supported by the PI4IOE5V6524?

The PI4IOE5V6524 supports I²C Fast-mode Plus operation up to 1 MHz, verified across its full operating range (0.8–3.6 V on I²C side). This exceeds standard Fast-mode (400 kHz) and enables faster register writes during system initialization or dynamic I/O reconfiguration in time-critical applications.

How does the PI4IOE5V6524 handle voltage translation between different logic families?

Voltage translation is implemented via two independent supply rails: V_DD(I²C-bus) sets SCL/SDA logic thresholds (0.8–3.6 V), while V_DD(P) defines GPIO voltage levels (1.65–5.5 V). Internal circuitry ensures bidirectional signal integrity without external components, enabling direct interfacing between sub-1 V processors and 5 V peripherals.

Can the PI4IOE5V6524 drive LEDs directly without external current-limiting resistors?

No - although the PI4IOE5V6524 supports latched push-pull outputs with up to 10 mA per pin (and 100 mA per octal bank), external current-limiting resistors are required for LED drive to ensure precise current control and thermal safety. The device provides drive strength programming but does not regulate current internally.

Is the PI4IOE5V6524 qualified for automotive applications?

The PI4IOE5V6524 is not AEC-Q100 qualified out-of-the-box. However, Diodes Incorporated offers automotive-grade variants (e.g., PI4IOE5V6524Q) with PPAP documentation, IATF 16949 manufacturing, and extended temperature testing. For automotive use, contact Diodes or Aetrix for qualified part numbers and qualification reports.

PI4IOE5V6524ZHEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Number of I/O:: 24

Interface:: I2C

Interrupt Output:: Yes

Features:: POR

Output Type:: Open Drain, Push-Pull

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

Clock Frequency:: 1 MHz

Voltage - Supply:: 0.8V ~ 3.6V, 1.65V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-TQFN (5x5)

PI4IOE5V6524ZHEX FAQ

1.How can I place an order for PI4IOE5V6524ZHEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI4IOE5V6524ZHEX 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 PI4IOE5V6524ZHEX reliable?

The price and inventory of PI4IOE5V6524ZHEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI4IOE5V6524ZHEX is usually 5 days.

3.What payment methods are accepted for PI4IOE5V6524ZHEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI4IOE5V6524ZHEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI4IOE5V6524ZHEX?

PI4IOE5V6524ZHEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI4IOE5V6524ZHEX 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 PI4IOE5V6524ZHEX?

For technical support, including PI4IOE5V6524ZHEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI4IOE5V6524ZHEX requirements.

6.How does Aetrix verify that PI4IOE5V6524ZHEX is sourced from the original manufacturer or authorized distributors?

All PI4IOE5V6524ZHEX 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 PI4IOE5V6524ZHEX meets industry standards.

7.What is the process for return or replacement of PI4IOE5V6524ZHEX?

All PI4IOE5V6524ZHEX units undergo pre-shipment inspection (PSI). If there is an issue with PI4IOE5V6524ZHEX, 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 PI4IOE5V6524ZHEX part is unused and in its original packaging.

Return procedure for PI4IOE5V6524ZHEX:

1.Submit a request within 90 days.

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

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