Diodes Incorporated PI4IOE5V6416RQ2LEX

Overview

PI4IOE5V6416RQ2LEX from Diodes Incorporated is a 16-bit bidirectional I²C-bus I/O expander with voltage-level translation across 1.65V–5.5V domains on both SDA/SCL and GPIO ports, supporting AEC-Q100 Grade 2 automotive qualification, 400kHz I²C interface, and programmable push-pull/open-drain outputs for sensor and keypad interfacing in battery-powered systems.

For engineers reviewing the PI4IOE5V6416RQ2LEX datasheet, PI4IOE5V6416RQ2LEX pinout, PI4IOE5V6416RQ2LEX application, or PI4IOE5V6416RQ2LEX equivalent, key selection considerations include dual-voltage domain operation, interrupt masking per GPIO, active-low reset that preserves register state, and latch-up immunity exceeding 100mA.

Technical Context

The device implements a fully compliant I²C-bus slave interface operating at up to 400kHz in fast-mode, with separate VDD(I2C_bus) and VDD(P) supplies enabling independent 1.65V–5.5V level translation between controller and peripheral sides. Internal registers include Input, Output, Polarity Inversion, Configuration (direction), Pull-Up/Pull-Down Enable, and Interrupt Mask registers.

It features an active-low open-drain INT output asserted on GPIO state change relative to the Input Port register, with per-pin interrupt masking capability. The active-low RESET input resets only the I²C state machine-leaving all I/O configuration and data registers intact-to recover from bus lockup without disrupting external signal states.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (L), lead-free and RoHS-compliant, 0.65mm pitch, body size 7.8mm × 4.4mm × 1.2mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA6424A and PCA9555, PI4IOE5V6416RQ2LEX uniquely supports independent 1.65V–5.5V domains on both bus and port sides, retains I/O state through reset, and delivers per-GPIO interrupt masking-making it optimal for automotive and battery-constrained designs demanding reliability and flexibility.

Availability

PI4IOE5V6416RQ2LEX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor aggregation, smart home keypad interfaces, and portable medical device UIs requiring stable component supply across extended product lifecycles.

Supply support for PI4IOE5V6416RQ2LEX 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, high-reliability solutions for automotive, industrial, and consumer markets.

The PI4IOE5V6416RQ2LEX belongs to Diodes' PI4IOE family of I²C I/O expanders engineered for automotive-grade mixed-voltage system interfacing, emphasizing robustness, low power, and register persistence during fault recovery.

FAQ

What is the function of the RESET pin on PI4IOE5V6416RQ2LEX?

The RESET pin is active-low and resets only the internal I²C state machine-leaving all I/O configuration registers, output states, and interrupt masks unchanged. This ensures external circuitry remains in its last known safe state during bus recovery, preventing unintended actuator movement or display corruption in automotive and medical applications.

Can PI4IOE5V6416RQ2LEX translate between 1.8V and 5V domains simultaneously?

Yes. Connect VDD(I2C_bus) to 1.8V (MCU side) and VDD(P) to 5V (peripheral side). The device internally translates logic levels bidirectionally on SDA/SCL and all 16 GPIO pins, eliminating external level shifters while maintaining full 400kHz I²C timing compliance across both domains.

How does the interrupt masking feature improve system power efficiency?

Each of the 16 GPIO pins can be individually masked from asserting the shared INT output. This prevents spurious wake-ups from noisy or unconnected inputs-allowing the host MCU to remain in deep sleep until only relevant events (e.g., keypad press or sensor alert) trigger an interrupt, reducing average system current by up to 40% in battery-operated devices.

Is PI4IOE5V6416RQ2LEX qualified for automotive use?

Yes. It is AEC-Q100 Grade 2 qualified (−40°C to +105°C), manufactured in IATF 16949-certified facilities, and PPAP-capable. Its >100mA latch-up immunity, register-retentive reset, and green packaging meet Tier-1 automotive supplier requirements for body control, lighting, and comfort systems.