PCA9673DB,112 Equivalent & Substitute Parts

Part Overview

The PCA9673DB,112 is a 16-channel I/O expander with I2C interface operating at 1 MHz, manufactured by NXP Semiconductors in 24-SSOP surface mount packaging. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The device provides push-pull output configuration with interrupt capability and power-on reset functionality, suitable for applications requiring expanded digital I/O control via I2C communication.

Substiute Parts

PCA9673DB,112

NXP SemiconductorsIn Stock: 1141PCA9673DB,112 Datasheet

Current PartRFQ

PCA9673PW,118

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

MFR RecommendedRFQ

TCA9539PWR

Texas InstrumentsIn Stock: 61089TCA9539PWR Datasheet

MFR RecommendedRFQ

PCA9673PW,118

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

MFR RecommendedRFQ

TCA9539PWR

Texas InstrumentsIn Stock: 61089TCA9539PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9673DB,112 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Number of I/O channels: 16 (fixed requirement)
• Interface protocol: I2C (mandatory)
• Output configuration: Push-Pull (mandatory)
• Interrupt output capability: Yes (required)
• Power-on reset feature: Yes (required)
• Operating temperature range: -40°C ~ 85°C (minimum requirement)
• Supply voltage range: Must encompass or exceed 2.3V ~ 5.5V
• RoHS3 compliance: Required for regulatory alignment

Substitute Parts Identified:

1. PCA9673PW,118 (NXP USA Inc.) – Direct functional equivalent with package variation (24-TSSOP vs. 24-SSOP). Maintains identical electrical specifications and active product status.

2. TCA9539PWR (Texas Instruments) – Functional substitute with operational differences in clock frequency (400 kHz vs. 1 MHz) and minimum source current (10mA vs. 100µA). Broader supply voltage range (1.65V ~ 5.5V) and SMBus protocol support provide extended compatibility.

Parameter Comparison

Engineering Selection Recommendations

PCA9673PW,118 is the primary substitute for direct replacement applications. This part maintains identical electrical specifications and clock frequency performance while offering active product status and improved availability. The package transition from 24-SSOP to 24-TSSOP requires PCB layout modification but provides superior thermal characteristics and manufacturing reliability. Both parts share NXP semiconductor lineage and ROHS3 compliance.

TCA9539PWR serves as an alternative substitute for applications where reduced clock frequency (400 kHz) is acceptable. This Texas Instruments device provides extended supply voltage range (1.65V minimum) and SMBus protocol compatibility, enabling broader system integration. The reduced source current specification (10mA vs. 100µA) may require circuit design evaluation for output drive requirements. Active product status and high inventory availability support long-term supply chain stability.

Selection between PCA9673PW,118 and TCA9539PWR depends on system timing requirements and output current demands. Applications requiring 1 MHz I2C operation and 100µA source current should prioritize PCA9673PW,118. Systems tolerating 400 kHz operation and lower source current specifications benefit from TCA9539PWR's extended voltage range and dual-protocol support.

Frequently Asked Questions (FAQ)

Q: Can PCA9673PW,118 replace PCA9673DB,112 in existing designs?

A: Yes. Both devices provide identical electrical specifications, I/O count, interface protocol, and operating temperature range. The package change from 24-SSOP to 24-TSSOP requires PCB footprint modification but maintains functional compatibility.

Q: What are the key differences between PCA9673PW,118 and TCA9539PWR?

A: Clock frequency differs (1 MHz vs. 400 kHz). Source current specification varies (100µA vs. 10mA). TCA9539PWR supports SMBus protocol in addition to I2C and provides lower minimum supply voltage (1.65V vs. 2.3V). Both maintain 16 I/O channels, push-pull output, and interrupt capability.

Q: Is TCA9539PWR suitable for applications requiring 1 MHz I2C operation?

A: No. TCA9539PWR operates at 400 kHz maximum clock frequency. Applications requiring 1 MHz I2C bus speed must use PCA9673PW,118 or equivalent 1 MHz devices.

Q: What packaging considerations apply to these substitutes?

A: PCA9673DB,112 uses 24-SSOP (0.209" width). Both substitutes use 24-TSSOP (0.173" width). TSSOP packaging is narrower and requires PCB layout redesign. Pin assignments remain identical across all three parts.

Q: Are all three parts RoHS3 compliant?

A: Yes. PCA9673DB,112, PCA9673PW,118, and TCA9539PWR all meet ROHS3 compliance requirements and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Which substitute offers better long-term availability?

A: TCA9539PWR demonstrates superior inventory position (60,988 pcs) compared to PCA9673PW,118 (2,400 pcs). Both maintain active product status. For critical supply chain applications, TCA9539PWR provides enhanced availability assurance.