TEXAS INSTRUMENTS TCA9538 PWR

Mfr. Part

TCA9538PWR

Manufacturer

Luminary Micro/Texas Instruments. Y-IC is a quality distributor for Texas Instruments and we are committed to delivering the best genuine products and services to every customer.

Detailed Description

8‑bit I2C/SMBus general-purpose I/O expander. Adds eight programmable GPIO pins to a host MCU or MPU through a simple two‑wire interface. Supports interrupt on input change to reduce polling, wide supply range for easy design-in, and low power consumption. Suitable for space‑constrained designs with a compact TSSOP‑16 footprint. Main Category: Integrated Circuits (ICs). Small Classification: Specialized ICs.

Key Features

8 configurable GPIO pins (each pin can be input or output)

I2C/SMBus two‑wire interface, Fast‑mode up to 400 kHz

Open‑drain active‑low interrupt output for pin‑change detection

Up to 8 selectable I2C addresses via A0–A2 address pins

Power‑on reset forces all I/O to inputs for safe startup

Wide supply voltage range (typical 1.65 V to 5.5 V)

Low standby current for battery‑powered systems

Glitch‑free power‑up behavior and robust ESD protection

Industrial temperature support (device grade dependent)

Key Advantages

Frees up MCU pins while keeping a simple software model

Interrupt‑driven design cuts I2C traffic and CPU load

Small 16‑pin TSSOP saves board space

Works across common logic rails (1.8 V, 3.3 V, 5 V systems)

Straightforward register interface; quick to prototype and scale

Broad ecosystem and long-term availability from TI

Packaging

Type: TSSOP‑16 (TI package code PW); orderable suffix PWR = tape‑and‑reel for automated assembly

Material: RoHS compliant, lead‑free finish (matte tin plated leads); moisture sensitivity typically MSL 1 (check datasheet/label for exact MSL)

Size: body width about 4.4 mm, body length about 5.0 mm, height ~1.2 mm max; lead pitch 0.65 mm; 16 leads

Pin configuration (typical): 8x I/O pins (P0–P7), SDA, SCL, A0–A2 (address), INT (open‑drain), RESET (active‑low), VCC, GND

Thermal characteristics: typical θJA for TSSOP‑16 ~100–140 °C/W depending on PCB copper and airflow; operating ambient temperature commonly −40 °C to +85 °C (verify exact grade)

Electrical properties (summary): VCC 1.65–5.5 V; I2C Fast‑mode up to 400 kHz; CMOS logic thresholds referenced to VCC; per‑pin sink/source suitable for logic‑level loads (see datasheet for exact current limits)

Lifecycle

Status: Active and in ongoing production. Not nearing discontinuation based on the latest public information from TI.

Equivalent or alternative models:

- Texas Instruments TCA9538A (similar function with address/register differences; review compatibility)

- Texas Instruments TCA9539 (16‑bit version; same family, different pin count)

- Texas Instruments TCA9555 (16‑bit, enhanced features; different register map/pinout)

- Texas Instruments TCA9534 (8‑bit expander variant; check pinout and registers)

- NXP PCA9538 / PCA9538A (functionally similar; verify pinout and register set)

- Microchip MCP23008 (8‑bit I2C expander; not pin/register compatible but a common alternative)

- Automotive: TCA9538‑Q1 (for automotive AEC‑Q100 applications)

If you need a drop‑in, pin‑for‑pin replacement, or automotive grade, contact Y-IC via our website and our sales team will propose the best compatible options and provide cross‑reference support.

Key Application Areas

MCU/MPU GPIO expansion in embedded systems

Keypad and switch matrix scanning

LED status indicators and simple LED driving

Sensor enable, configuration pins, and power‑good monitoring

DIP switch/board ID reading and system configuration

Servers, networking, storage, and telecom equipment

Industrial control, building automation, and smart appliances

Consumer electronics and white goods

Automotive designs using the Q1 variant

Datasheet

Y-IC hosts the most authoritative and up‑to‑date datasheet for this product on our website. We strongly recommend downloading the datasheet from the current product page to get exact electrical, timing, mechanical, and thermal specifications.

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