PCA9673D,118 Equivalent & Substitute Parts

Part Overview

The PCA9673D,118 is a 16-channel I/O Expander with I2C interface operating at 1 MHz, manufactured by NXP USA Inc. in a 24-SOIC package. This component is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part provides push-pull output configuration with interrupt capability and power-on reset functionality across a 2.3V to 5.5V supply range.

Substiute Parts

PCA9673D,118

NXP USA Inc.In Stock: 977PCA9673D,118 Datasheet

Current PartRFQ

PCA9673PW,118

NXP USA Inc.In Stock: 2433PCA9673PW,118 Datasheet

MFR RecommendedRFQ

PCA9539DW

Texas InstrumentsIn Stock: 66179PCA9539DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9673D,118 is determined by the following critical parameters:

• I/O Channel Count: 16 channels (fixed requirement)
• Interface Protocol: I2C compatibility (mandatory)
• Supply Voltage Range: 2.3V ~ 5.5V (must encompass or match)
• Operating Temperature Range: -40°C ~ 85°C (must match or exceed)
• Output Configuration: Push-Pull with interrupt capability
• Package Compatibility: Surface mount options with electrical equivalence

The identified substitutes maintain these core electrical specifications while offering different package formats or enhanced product status. Clock frequency variations (1 MHz vs. 400 kHz) remain within acceptable I2C protocol limits for backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

PCA9673PW,118 (NXP USA Inc., Active Status)

This substitute maintains identical electrical specifications to the PCA9673D,118, including 1 MHz clock frequency and 100µA source current capability. The primary difference is package format: 24-TSSOP versus 24-SOIC. This part carries Active product status, ensuring long-term availability and supply continuity. Selection is appropriate when PCB layout accommodates TSSOP footprint or when new designs require extended component lifecycle.

PCA9539DW (Texas Instruments, Last Time Buy Status)

This substitute provides 16-channel I/O expansion with I2C and SMBus protocol support across identical supply and temperature ranges. The clock frequency is reduced to 400 kHz, which remains compliant with I2C standard specifications. Output source current is specified at 10mA versus 100µA on the original part. The 24-SOIC package matches the PCA9673D,118 footprint directly. Product status is Last Time Buy, indicating limited future availability; selection should prioritize near-term applications only.

Frequently Asked Questions (FAQ)

Q: Can PCA9673PW,118 replace PCA9673D,118 in existing designs?

A: Electrical substitution is direct. The 24-TSSOP package requires PCB layout modification compared to the 24-SOIC original. Pin-to-pin functionality is equivalent for all 16 I/O channels, I2C interface, and interrupt output.

Q: What is the impact of 400 kHz clock frequency on PCA9539DW compatibility?

A: I2C protocol supports operation at 400 kHz standard mode. The PCA9539DW operates within this specification. Systems designed for 1 MHz fast-mode I2C will function correctly at reduced clock speed with potential latency implications in high-frequency polling applications.

Q: Does PCA9539DW source current specification affect circuit design?

A: The PCA9539DW specifies 10mA source current versus 100µA on the original part. Load impedance and drive requirements must be re-evaluated. Sink current remains 25mA across all three parts.

Q: Are all three parts RoHS3 compliant?

A: Yes. PCA9673D,118, PCA9673PW,118, and PCA9539DW all carry ROHS3 Compliant certification.

Q: Which substitute offers the longest product lifecycle?

A: PCA9673PW,118 carries Active product status, indicating ongoing manufacturing and support. PCA9539DW is Last Time Buy, and PCA9673D,118 is Obsolete.