PCA9621PW,118

I/o Expanders Overview

The PCA9621PW,118 is a monolithic CMOS integrated circuit providing an 8-bit output port controlled via a 2-wire bus interface. It operates within a supply voltage range of 2.7 V to 5.5 V and features individually selectable open-drain outputs with a static sink capability of 65 mA per port. The device supports Fast-mode Plus (Fm+) I2C-bus signaling, enabling operation at frequencies exceeding 1 MHz and accommodating up to 4000 pF bus capacitance. Addressing is configured through three external pins (A0, A1, A2), allowing multiple devices on the same bus. The component is housed in a TSSOP16 package.

I/o Expanders Feature Summary

• Eight individually addressable open-drain output ports capable of driving LEDs or general-purpose loads
• Fast-mode Plus compatible 2-wire bus interface supporting high-speed communication and long cable connections
• Active LOW reset input for clearing the control register and disabling all outputs simultaneously

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and tape-and-reel specifications. Ensure that the intended application environment remains within the specified operating temperature range of -40 °C to +85 °C. Confirm that the system design adheres to the absolute maximum ratings for supply voltage and pin currents to prevent permanent damage to the integrated circuit.

I/o Expanders Selection Notes

Select this component when an 8-channel output expander with high sink current is required for I2C-based systems. The device is suitable for applications needing direct LED drive without additional transistors. Consider the available address combinations if multiple units are deployed on a single bus line. Verify that the host controller supports the required Fast-mode Plus signaling speeds for optimal performance.

I/o Expanders Part Context

This part belongs to the PCA9621 series of 2-wire bus output ports manufactured by NXP Semiconductors. The PW suffix indicates the TSSOP16 plastic thin shrink small outline package variant. Other variants in the series include the SO16 package version. The device is designed to integrate seamlessly with other NXP I2C-bus components such as bus switches and multiplexers for scalable system designs.

I/o Expanders Replacement Considerations

Direct functional substitutes within the same family include the PCA9621D,118, which utilizes an SO16 package instead of TSSOP16. Designers must verify pin compatibility and thermal characteristics when swapping between package types. No alternative cross-brand replacements are documented in the provided source material.