PCA9674AD,512 Equivalent & Substitute Parts

Part Overview

The PCA9674AD,512 is an 8-bit I/O Expander with I2C interface operating at 1 MHz, manufactured by NXP USA Inc. in a 16-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides push-pull output configuration with 100µA source and 25mA sink current capability, operating across a 2.3V to 5.5V supply range with power-on reset functionality.

Substiute Parts

PCA9674AD,512

NXP USA Inc.In Stock: 670PCA9674AD,512 Datasheet

Current PartRFQ

PCA9674APW,118

NXP USA Inc.In Stock: 54576PCA9674APW,118 Datasheet

MFR RecommendedRFQ

MAX7329AWE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1106MAX7329AWE+T Datasheet

MFR RecommendedRFQ

PCA9534ADW

Texas InstrumentsIn Stock: 877PCA9534ADW Datasheet

MFR RecommendedRFQ

PCA9534ADWR

Texas InstrumentsIn Stock: 3323PCA9534ADWR Datasheet

MFR RecommendedRFQ

PCA9534DW

Texas InstrumentsIn Stock: 782PCA9534DW Datasheet

MFR RecommendedRFQ

PCA9534DWR

Texas InstrumentsIn Stock: 2205PCA9534DWR Datasheet

MFR RecommendedRFQ

TCA9534ADWR

Texas InstrumentsIn Stock: 3016TCA9534ADWR Datasheet

MFR RecommendedRFQ

TCA9534ADWT

Texas InstrumentsIn Stock: 1679TCA9534ADWT Datasheet

MFR RecommendedRFQ

TCA9534DWR

Texas InstrumentsIn Stock: 65813TCA9534DWR Datasheet

MFR RecommendedRFQ

TCA9534DWT

Texas InstrumentsIn Stock: 45334TCA9534DWT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9674AD,512 is determined by the following critical parameters: 8 I/O count, I2C interface, push-pull output configuration, 100µA/25mA current capability, 2.3V–5.5V supply voltage range, and -40°C to 85°C operating temperature. The 1 MHz clock frequency is a defining characteristic of the original part.

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalent (16-SOIC) Parts maintaining identical package form factor, electrical specifications, and 1 MHz operation: PCA9674APW,118 (16-TSSOP alternative packaging from same manufacturer).

Category 2: Functional Equivalents with Parameter Variations Parts providing 8-bit I/O expansion with I2C interface but differing in clock frequency, output type, or supply voltage range: MAX7329AWE+T (100 kHz, open drain output), PCA9534 series (400 kHz, SMBus compatible), and TCA9534 series (400 kHz, extended supply range 1.65V–5.5V).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance): PCA9674APW,118 is the primary substitute, offering identical electrical specifications and 1 MHz operation from the same manufacturer (NXP). The only difference is packaging format (16-TSSOP vs. 16-SOIC), which requires PCB layout adjustment. This part maintains active product status and superior inventory availability (54,466 units).

For Active Product Status with Functional Compatibility: PCA9534DWR and TCA9534 series (TCA9534ADWR, TCA9534ADWT, TCA9534DWR, TCA9534DWT) provide active product status with 400 kHz I2C operation. These parts are suitable when higher clock frequency is acceptable. PCA9534 variants maintain the original 2.3V–5.5V supply range, while TCA9534 variants extend the lower supply limit to 1.65V. All maintain push-pull output and 16-SOIC packaging.

For Extended Temperature Range: MAX7329AWE+T operates to 125°C (vs. 85°C for the original), suitable for high-temperature applications. However, this part operates at 100 kHz with open-drain output, requiring pull-up resistors and limiting output current to 25mA.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory standing. Moisture sensitivity levels vary: PCA9674APW,118 offers MSL 1 (unlimited), while PCA9534 variants provide MSL 1 (unlimited) with superior long-term storage characteristics compared to the original MSL 2 (1 year).

Frequently Asked Questions (FAQ)

Q: Can PCA9674APW,118 replace PCA9674AD,512 directly in the circuit? A: Electrically yes, with PCB layout modification. Both parts provide identical I2C 1 MHz operation, 8-bit I/O, push-pull output, and supply voltage range. The difference is package form factor: PCA9674APW,118 uses 16-TSSOP (4.40mm width) versus 16-SOIC (7.50mm width) for the original. Pin assignments are compatible; only PCB footprint changes.

Q: What are the trade-offs when using PCA9534DWR instead of PCA9674AD,512? A: PCA9534DWR operates at 400 kHz (vs. 1 MHz), providing faster I2C communication. It adds SMBus compatibility and maintains push-pull output with 2.3V–5.5V supply range. Output source current is reduced to 10mA (vs. 100µA), though sink current remains 25mA. The part is in active production status, ensuring long-term availability.

Q: Is MAX7329AWE+T suitable for low-speed applications? A: MAX7329AWE+T operates at 100 kHz, suitable for applications not requiring 1 MHz I2C speed. The open-drain output requires external pull-up resistors and limits output current to 25mA sink only (no source current specified). Extended temperature range to 125°C is beneficial for harsh environments. Supply voltage minimum is 2.5V (vs. 2.3V for the original).

Q: Why do TCA9534 parts specify lower supply voltage (1.65V minimum)? A: TCA9534 series extends the lower supply voltage limit to 1.65V, enabling operation in low-power applications. This is a superset capability; the part functions normally at 2.3V and above, matching the original part's operating range. Higher clock frequency (400 kHz) and active product status make this series suitable for new designs.

Q: What packaging options are available for 1 MHz I2C operation? A: Only PCA9674APW,118 maintains 1 MHz operation, available in 16-TSSOP packaging with tape & reel (TR) delivery. The original 16-SOIC package is not available in active production for 1 MHz I/O expanders. If 16-SOIC packaging is mandatory, substitute parts operate at 100 kHz (MAX7329AWE+T) or 400 kHz (PCA9534, TCA9534 series).

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements for EU and global markets.