PCA9621D,118

I/o Expanders Overview

The PCA9621D,118 is a monolithic CMOS integrated circuit designed for general-purpose output drive via a 2-wire bus interface. It features eight individually selectable open-drain output ports with a 65 mA static sink capability per port. The device operates on supply voltages ranging from 2.7 V to 5.5 V and supports Fast-mode Plus (Fm+) signaling at speeds exceeding 1 MHz. It includes an active LOW reset input and address pins for multi-device addressing. The component is housed in an SO16 plastic small outline package.

I/o Expanders Feature Summary

• Eight independently configurable open-drain output ports capable of driving LEDs or general loads
• Fast-mode Plus compatible 2-wire bus interface supporting I2C-bus, SMBus, and PMBus protocols
• Active LOW hardware reset pin for immediate initialization and default state restoration

I/o Expanders Applications

• LED and 7-segment display drivers
• Simple high-power LED dimming circuits
• General purpose digital output expansion
• Instrumentation status indicators

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' against official NXP documentation to confirm tape-and-reel packaging specifications. Ensure the selected variant matches the required ambient temperature range of -40 °C to +85 °C. Confirm that the SO16 package dimensions align with the target PCB footprint design constraints.

I/o Expanders Selection Notes

Select this component when a microcontroller requires additional high-current sinking capability beyond its native GPIO limits. It is suitable for systems needing multiple isolated outputs controlled by a standard I2C bus. Consider the 65 mA per-port limit and total power dissipation constraints when designing for high-density LED arrays.

I/o Expanders Part Context

The PCA9621D belongs to the PCA962x series of 2-wire bus output ports manufactured by NXP Semiconductors. This series provides scalable solutions for expanding I/O capabilities in embedded systems. The 'D' designation specifically identifies the SO16 surface-mount package variant within the product family.

I/o Expanders Replacement Considerations

PCA9621PW: Identical functional specifications but utilizes a TSSOP16 package instead of SO16.