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

NXP Semiconductors PCA8575D,112

Name: PCA8575D,112
Brand: NXP Semiconductors
SKU: PCA8575D,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCA8575D,112

Manufacturer:: NXP Semiconductors

Category:: I/O Expanders

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: PCA8575D,112.pdf

Description:: IC XPNDR 400KHZ I2C 24SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PCA8575D,112 from NXP Semiconductors is a 16-bit quasi-bidirectional I²C-bus I/O expander with active-low open-drain interrupt output, 2.3–5.5 V operation, 25 mA per-pin sink capability, and 8 programmable slave addresses via AD0–AD2 pins. It enables remote GPIO expansion in space-constrained industrial controllers and LED display systems.

For engineers reviewing the PCA8575D,112 datasheet, PCA8575D,112 pinout, PCA8575D,112 application, or PCA8575D,112 equivalent, this device delivers deterministic interrupt-driven port change detection, latched outputs for direct LED drive, and I²C Fast Mode (400 kHz) compatibility without software modification versus PCF8575.

Technical Context

The PCA8575D,112 implements a dual-octet quasi-bidirectional I/O architecture: P00–P07 and P10–P17 each form independent 8-bit ports with internal pull-up current sources (I_trt(pu)) and latch control. Power-on reset initializes all I/Os as high-impedance inputs, ensuring safe startup in mixed-voltage systems.

Its interrupt logic asserts INT on any rising or falling edge at input pins and clears byte-wise-reading P0n clears P0-associated interrupts, reading P1n clears P1-associated interrupts-enabling selective event handling without full port polling. The I²C interface complies with Fast Mode timing (t_LOW ≥ 1.3 µs, f_SCL ≤ 400 kHz) and supports up to 8 devices on one bus via AD0–AD2 address selection.

Key Specifications

Parameter	Value and Actual Design Meaning
I²C Bus Speed	400 kHz Fast Mode - supports high-throughput GPIO updates without MCU bus contention
Supply Voltage Range	2.3 V to 5.5 V - interoperable with 3.3 V and 5 V microcontrollers; I/Os tolerant to 5.5 V
Port Sink Current	25 mA per pin (max), 400 mA total package - drives LEDs directly without external drivers
Interrupt Output	Active-low open-drain INT - wired-OR compatible with multiple expanders sharing one MCU interrupt line
Slave Address Options	8 unique addresses (0x20–0x27) via AD0/AD1/AD2 - enables multi-device I²C networks without address conflict
Standby Current	10 µA max - suitable for battery-backed or low-power always-on monitoring applications
Operating Temperature	−40 °C to +85 °C - qualified for industrial and medical equipment environments

Pinout & Package

PCA8575D,112 is supplied in SO24 (SOT137-1) package: plastic small outline, 24 leads, 7.5 mm body width, 1.27 mm lead pitch. Pin 1 is index-marked; pin 12 and pin 9 are both VSS (supply ground) - both must be connected to PCB ground plane for proper operation and thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
INT (Pin 1)	Interrupt output	Active-low open-drain signal - requires external pull-up; asserts on any I/O edge, clears per-byte read
AD0–AD2 (Pins 21, 2, 3)	Slave address inputs	Set 3-bit hardware address (0x20–0x27); no internal pull-ups - must be tied to VDD or VSS
P00–P07 (Pins 4–11)	Quasi-bidirectional I/O Port 0	Independent 8-bit port; defaults HIGH at power-up; sink up to 25 mA each
P10–P17 (Pins 13–20)	Quasi-bidirectional I/O Port 1	Independent 8-bit port; identical electrical behavior to Port 0; byte-wise interrupt clearing
VDD (Pin 24), VSS (Pins 12, 9)	Power supply	Dual VSS pins ensure low-impedance ground return; VDD must be decoupled locally with 100 nF ceramic
SCL/SDA (Pins 22, 23)	I²C interface	Compliant with Fast Mode timing; require external pull-up resistors (typically 2.2 kΩ @ 3.3 V)

Key Features

Feature	Design Value
Byte-wise interrupt clearing	Reading P0n clears only P0-related interrupts; reading P1n clears only P1-related interrupts - enables precise event prioritization
Latched output architecture	Each I/O retains its state after write - eliminates need for continuous MCU polling or refresh cycles
Transient boosted pull-up (I_trt(pu))	Up to −1.0 mA pull-up current during rising edges - ensures fast signal transitions into capacitive loads (e.g., long traces, LED arrays)
Readable device ID	Manufacturer (NXP), device type (PCA8575), and revision encoded - enables firmware validation and field diagnostics
ESD robustness	2000 V HBM, 200 V MM, 1000 V CDM - withstands handling and board-level ESD events in industrial assembly

Applications

LED Signage Control	Industrial PLC I/O Expansion
Use Scenario: Driving 16-segment alphanumeric displays and status indicators in outdoor digital signage cabinets. IC Role / Device Role / Timing Role: Remote I/O expander providing sink-current outputs for common-anode LED segments; INT signals segment update completion. Use Value: Eliminates need for discrete transistors or shift registers; 25 mA per pin drives standard LEDs directly; 400 mA total sink supports full-row multiplexing.	Use Scenario: Adding isolated digital inputs/outputs to compact DIN-rail mounted PLC modules with limited MCU GPIO. IC Role / Device Role / Timing Role: I²C-connected GPIO extension with deterministic interrupt reporting for sensor status changes (e.g., limit switches, safety interlocks). Use Value: Reduces main controller interrupt load; byte-wise INT clearing allows prioritized response to critical vs. non-critical I/O events.
Medical Equipment Panel Interface	Server Rack Management Controller
Use Scenario: Managing front-panel pushbuttons, status LEDs, and buzzer alerts in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Quasi-bidirectional port handling both button reads (input) and LED/buzzer drives (output); POR ensures safe default state at power-up. Use Value: Single-chip solution replaces discrete buffers and level shifters; −40 °C to +85 °C rating meets medical environmental requirements.	Use Scenario: Monitoring hot-swap module presence, fan tachometer inputs, and fault LEDs across 1U server backplanes. IC Role / Device Role / Timing Role: I²C slave providing 16 configurable I/Os; INT line alerts BMC of unexpected module insertion/removal or fan stall. Use Value: 8-address flexibility allows daisy-chaining across multiple server trays; 2.3–5.5 V range interfaces seamlessly with 3.3 V BMC and 5 V fan supplies.

LED Signage Control

Industrial PLC I/O Expansion

Use Scenario: Driving 16-segment alphanumeric displays and status indicators in outdoor digital signage cabinets.

IC Role / Device Role / Timing Role: Remote I/O expander providing sink-current outputs for common-anode LED segments; INT signals segment update completion.

Use Value: Eliminates need for discrete transistors or shift registers; 25 mA per pin drives standard LEDs directly; 400 mA total sink supports full-row multiplexing.

Use Scenario: Adding isolated digital inputs/outputs to compact DIN-rail mounted PLC modules with limited MCU GPIO.

IC Role / Device Role / Timing Role: I²C-connected GPIO extension with deterministic interrupt reporting for sensor status changes (e.g., limit switches, safety interlocks).

Use Value: Reduces main controller interrupt load; byte-wise INT clearing allows prioritized response to critical vs. non-critical I/O events.

Medical Equipment Panel Interface

Server Rack Management Controller

Use Scenario: Managing front-panel pushbuttons, status LEDs, and buzzer alerts in diagnostic imaging equipment.

IC Role / Device Role / Timing Role: Quasi-bidirectional port handling both button reads (input) and LED/buzzer drives (output); POR ensures safe default state at power-up.

Use Value: Single-chip solution replaces discrete buffers and level shifters; −40 °C to +85 °C rating meets medical environmental requirements.

Use Scenario: Monitoring hot-swap module presence, fan tachometer inputs, and fault LEDs across 1U server backplanes.

IC Role / Device Role / Timing Role: I²C slave providing 16 configurable I/Os; INT line alerts BMC of unexpected module insertion/removal or fan stall.

Use Value: 8-address flexibility allows daisy-chaining across multiple server trays; 2.3–5.5 V range interfaces seamlessly with 3.3 V BMC and 5 V fan supplies.

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C I/O expander applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCF8575T/3,118	No interrupt output; identical pinout and register map but lacks INT pin and associated logic	Requires continuous I²C polling instead of event-driven wake-up; unsuitable where low-power interrupt latency matters	Select when interrupt functionality is unnecessary and cost minimization is primary
TCA6424ARGJR	24-bit I/O, 1.65–5.5 V, push-pull INT, higher I²C speed (1 MHz), integrated voltage translation	Supports mixed-voltage I²C buses (e.g., 1.8 V MCU ↔ 3.3 V peripherals); larger footprint (QFN32)	Select when expanding beyond 16 bits or interfacing heterogeneous voltage domains

Compared with PCF8575T/3,118, PCA8575D,112 adds deterministic interrupt signaling for reduced MCU overhead; compared with TCA6424ARGJR, it offers smaller SO24 packaging and lower unit cost at the expense of bit count and voltage flexibility.

Availability

PCA8575D,112 is available at Aetrix Electronics and suitable for industrial control, medical equipment, and LED signage applications requiring stable component supply and long-term production continuity.

Supply support for PCA8575D,112 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface and mixed-signal ICs.

The PCA8575D,112 belongs to NXP's legacy I²C I/O expander product line, designed specifically for reliable remote GPIO expansion in resource-constrained embedded systems where interrupt-driven responsiveness and direct LED drive capability are essential.

FAQ

What is the function of the INT pin on the PCA8575D,112?

The INT pin on the PCA8575D,112 is an active-low open-drain interrupt output that signals the host microcontroller whenever any of the 16 I/O pins changes state. It eliminates the need for periodic I²C polling by enabling event-driven system response. The PCA8575D,112 asserts INT on rising or falling edges and clears it byte-wise upon reading the corresponding port (P0n or P1n), allowing selective acknowledgment of I/O events.

Can the PCA8575D,112 drive LEDs directly without external components?

Yes, the PCA8575D,112 can drive LEDs directly: each of its 16 quasi-bidirectional I/O pins supports up to 25 mA sink current at V_OL = 0.5 V, and the total package sink capability is rated at 400 mA. This allows direct connection of common-anode LEDs with current-limiting resistors only - no external transistors or driver ICs are required. The PCA8575D,112 also features transient boosted pull-up current (I_trt(pu)) to ensure fast LED turn-off transitions.

How many PCA8575D,112 devices can share the same I²C bus?

Up to eight PCA8575D,112 devices can operate on the same I²C bus, each assigned a unique slave address via the AD0, AD1, and AD2 pins. These three address inputs configure addresses from 0x20 to 0x27 (hex). No internal pull-ups exist on these pins, so each must be hard-wired to VDD or VSS. The PCA8575D,112 does not support General Call (0x00) or Device ID (0xF8) addressing modes.

Is the PCA8575D,112 a drop-in replacement for the PCF8575?

The PCA8575D,112 is electrically and software-compatible with the PCF8575 for write operations and basic read functionality, but differs in interrupt timing behavior: the PCA8575D,112 clears interrupts byte-wise (reading P0n clears P0 interrupts; reading P1n clears P1 interrupts), whereas the PCF8575 clears all interrupts only after both bytes are read. This difference requires firmware awareness if migrating existing PCF8575 designs to PCA8575D,112.

What is the power-on reset behavior of the PCA8575D,112?

Upon power application, the PCA8575D,112's internal Power-On Reset (POR) circuit holds the device in reset until V_DD reaches V_POR (min 1.8 V, typ 2.0 V). During reset, all 16 I/O pins are configured as high-impedance inputs with internal pull-up current sources enabled, resulting in logic HIGH states. This ensures safe default conditions for connected peripherals. The PCA8575D,112 remains in reset if V_DD drops below 0.2 V.

PCA8575D,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Number of I/O:: 16

Interface:: I2C

Interrupt Output:: Yes

Features:: POR

Output Type:: Push-Pull

Current - Output Source/Sink:: 100µA, 25mA

Clock Frequency:: 400 kHz

Voltage - Supply:: 2.3V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SO

PCA8575D,112 FAQ

1.How can I place an order for PCA8575D,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCA8575D,112 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 PCA8575D,112 reliable?

The price and inventory of PCA8575D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8575D,112 is usually 5 days.

3.What payment methods are accepted for PCA8575D,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8575D,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCA8575D,112?

PCA8575D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCA8575D,112 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 PCA8575D,112?

For technical support, including PCA8575D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8575D,112 requirements.

6.How does Aetrix verify that PCA8575D,112 is sourced from the original manufacturer or authorized distributors?

All PCA8575D,112 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 PCA8575D,112 meets industry standards.

7.What is the process for return or replacement of PCA8575D,112?

All PCA8575D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8575D,112, 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 PCA8575D,112 part is unused and in its original packaging.

Return procedure for PCA8575D,112:

1.Submit a request within 90 days.

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

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