NXP Semiconductors PCA9675BS,118

Overview

PCA9675BS,118 from NXP Semiconductors is a 16-bit remote I/O expander for Fast-mode Plus (Fm+) I²C-bus systems, providing quasi-bidirectional port expansion with interrupt signaling. It operates from 2.3 V to 5.5 V, supports 1 MHz I²C-bus speed, delivers 25 mA sink per I/O pin, and features 400 mA total package sink capacity-enabling direct LED PWM dimming in signage and industrial control panels.

For engineers reviewing the PCA9675BS,118 datasheet, PCA9675BS,118 pinout, PCA9675BS,118 application, or PCA9675BS,118 equivalent, key selection criteria include its HVQFN24 package footprint, 64 programmable slave addresses, active-low open-drain INT output, latched I/Os with power-on reset defaulting to inputs, and compatibility with Fm+ bus drive requirements up to 4000 pF.

Technical Context

The PCA9675BS,118 implements a quasi-bidirectional I/O architecture where all 16 pins (P00–P07, P10–P17) function as independently configurable inputs or outputs without direction-control lines. Internal Power-On Reset initializes ports as high-impedance inputs, and software reset via General Call address 00h + data byte 06h restores default states.

Its interrupt logic asserts INT on any rising/falling edge of input port transitions, and deasserts upon read/write access to the triggering device. The I²C interface complies with Standard-mode (100 kHz), Fast-mode (400 kHz), and Fast-mode Plus (1 MHz) specifications, with SDA capable of 30 mA sink current for robust bus loading.

Key Specifications

Pinout & Package

HVQFN24 package (SOT616-1): 4 mm × 4 mm × 0.85 mm body, 24-terminal no-lead thermal-enhanced quad flat package with exposed center pad soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA9535RTWR and PCA9535PW,118, the PCA9675BS,118 uniquely delivers 1 MHz I²C operation, 400 mA sink capacity, and 64 address options-making it the only option among the three that supports real-time LED PWM and large-scale I/O expansion without bus buffering or address conflicts.

Availability

PCA9675BS,118 is available at Aetrix Electronics and suitable for LED signage, industrial control systems, and server management requiring stable component supply, long-term lifecycle assurance, and consistent HVQFN24 packaging.

Supply support for PCA9675BS,118 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 system-level ICs.

The PCA9675BS,118 belongs to NXP's Fast-mode Plus I²C remote I/O expander product line, designed specifically to replace legacy PCF8575 devices in high-density, high-speed embedded control systems demanding enhanced drive strength and address scalability.

FAQ

What is the package type and pin count of the PCA9675BS,118?

The PCA9675BS,118 uses an HVQFN24 package (SOT616-1) with 24 terminals in a 4 mm × 4 mm × 0.85 mm body. It features an exposed thermal pad that must be soldered to a PCB ground plane for proper thermal dissipation and electrical stability. Pin assignments match the HVQFN24 pinout defined in the official NXP datasheet Rev. 2, including dedicated INT, AD0–AD2, SCL, SDA, VDD, VSS, and 16 I/O ports (P00–P07, P10–P17).

Does the PCA9675BS,118 support 1 MHz I²C communication?

Yes, the PCA9675BS,118 fully supports Fast-mode Plus (Fm+) I²C operation at up to 1 MHz-double the speed of standard Fast-mode devices. This capability is confirmed in the NXP datasheet and enables time-critical functions such as synchronized LED PWM dimming and low-latency sensor polling. The SDA line sustains 30 mA sink current, allowing reliable operation on buses with up to 4000 pF capacitance without external buffers.

How does the interrupt (INT) pin function on the PCA9675BS,118?

The INT pin on the PCA9675BS,118 is an active-low open-drain output that asserts when any rising or falling edge occurs on configured input ports. It remains asserted until the host reads the port register or writes new data-automatically clearing the interrupt condition. This asynchronous notification eliminates continuous I²C polling, reducing MCU overhead in applications like industrial alarm monitoring or hot-swap detection in servers.

Can the PCA9675BS,118 directly drive LEDs, and what is its current capability?

Yes, the PCA9675BS,118 can directly drive LEDs with 25 mA sink current per I/O pin and a total package sink capacity of 400 mA. This allows all 16 outputs to simultaneously source 25 mA-sufficient for standard indicator LEDs or low-power displays. Its latched output architecture and 1 MHz I²C interface further support precise PWM dimming control without external drivers or transistors.

What are the power supply requirements for the PCA9675BS,118?

The PCA9675BS,118 operates from a single supply of 2.3 V to 5.5 V on VDD, with I/O pins tolerant up to 5.5 V-even when VDD is at 3.3 V. This voltage flexibility enables interoperability with both 3.3 V microcontrollers and 5 V peripherals. The internal Power-On Reset circuit ensures all 16 I/Os initialize as high-impedance inputs, preventing unintended current flow during power ramp-up.