NXP Semiconductors PCA9621D,118

Overview

PCA9621D,118 from NXP Semiconductors is an 8-bit open-drain I²C-bus output port IC with 65 mA per-port sink capability, programmable via Fast-mode Plus (Fm+) 2-wire interface up to 1 MHz, operating from 2.7 V to 5.5 V supply - designed for LED driving, 7-segment display control, and general-purpose high-current digital output staging.

For engineers reviewing the PCA9621D,118 datasheet, PCA9621D,118 pinout, PCA9621D,118 application, or PCA9621D,118 equivalent, this device delivers deterministic open-drain output control with hardware reset, addressable slave configuration (A0–A2), and Fm+ bus compatibility for high-capacitance or long-cable I²C systems.

Technical Context

The PCA9621D,118 implements a single 8-bit control register directly mapped to P0–P7 open-drain outputs; each bit enables sinking (logic HIGH in register → LOW at port) or disables (logic LOW → high-impedance). Its I²C slave transceiver supports Standard-mode, Fast-mode, and Fast-mode Plus (30 mA drive, ≤4000 pF load), with SCL/SDA clamped to VDD/VSS via ESD diodes.

Power-On Reset (POR) holds the IC in reset for ≤500 ns, initializing the control register to all zeros (all ports off). The active-low RESET pin clears the register and resets the I²C block; address pins A0–A2 are externally driven with no internal pull-ups, enabling up to eight unique slave addresses on one bus segment.

Key Specifications

Pinout & Package

PCA9621D,118 is housed in a plastic small outline package (SO16), 16-pin, 3.9 mm body width (SOT109-1), with standard gull-wing lead form factor suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit I²C output port applications.

Compared with TCA6408A and PCA9671, PCA9621D,118 uniquely combines 65 mA sink capability with Fast-mode Plus bus performance - making it the only option among the three capable of driving high-brightness LEDs while maintaining >1 MHz I²C throughput over long or heavily loaded buses.

Availability

PCA9621D,118 is available at Aetrix Electronics and suitable for LED lighting control, industrial HMI interfaces, and embedded instrumentation requiring stable component supply with guaranteed long-term manufacturability.

Supply support for PCA9621D,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCA9621D,118 belongs to NXP's I²C-bus peripheral portfolio, engineered specifically for robust, high-drive digital output expansion in electrically noisy or physically extended embedded systems.

FAQ

What is the maximum sink current per output port on the PCA9621D,118?

The PCA9621D,118 provides a guaranteed 65 mA continuous sink current per output port (P0–P7) under specified operating conditions. This rating applies individually to each port and enables direct driving of medium-power LEDs without external transistor stages. Absolute maximum ratings permit short-duration 100 mA per port in defined groupings, but sustained operation should remain at or below 65 mA per port to ensure reliability and thermal stability.

Does the PCA9621D,118 support Fast-mode Plus (Fm+) I²C operation?

Yes, the PCA9621D,118 fully supports Fast-mode Plus (Fm+) I²C operation with 30 mA drive capability on SCL and SDA, enabling reliable communication at speeds exceeding 1 MHz and supporting bus capacitances up to 4000 pF. This makes the PCA9621D,118 suitable for long-cable deployments and systems with many parallel I²C peripherals where standard Fast-mode (400 kHz) would fail due to signal integrity degradation.

How does the RESET pin function on the PCA9621D,118?

The RESET pin on the PCA9621D,118 is an active-low asynchronous input that immediately clears the 8-bit control register to all zeros and disables all output ports (P0–P7) by placing them in high-impedance state. It also resets the internal I²C-bus slave transceiver logic. The pin features hysteresis (100–200 mV) for noise immunity and requires a minimum low pulse width of 25 ns to trigger reliably.

Can multiple PCA9621D,118 devices share the same I²C bus?

Yes, up to eight PCA9621D,118 devices can share a single I²C bus segment using hardware address pins A0, A1, and A2. These pins configure the three LSBs of the fixed 7-bit slave address (1100 A2 A1 A0), yielding eight unique addresses (0xC0–0xC7). No software address programming is required - addressing is purely hardware-defined and stable across power cycles.

What package type is used for the PCA9621D,118?

The PCA9621D,118 uses the SO16 plastic small outline package (SOT109-1), featuring 16 gull-wing leads, 3.9 mm body width, and standard JEDEC MS-012 footprint. This package is RoHS-compliant, reflow-solderable, and compatible with automated PCB assembly processes including wave and reflow soldering per J-STD-020C guidelines.