PCA9674PW,112 Equivalent & Substitute Parts

Part Overview

The PCA9674PW,112 is an 8-channel I/O expander with I2C interface operating at 1 MHz, manufactured by NXP Semiconductors in a 16-TSSOP surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides push-pull output configuration with interrupt output capability and power-on reset (POR) feature, suitable for applications requiring expanded I/O capabilities in I2C-based systems.

Substiute Parts

PCA9674PW,112

NXP SemiconductorsIn Stock: 1131PCA9674PW,112 Datasheet

Current PartRFQ

PCA9534APWR

Texas InstrumentsIn Stock: 17321PCA9534APWR Datasheet

MFR RecommendedRFQ

PCA9534PWR

Texas InstrumentsIn Stock: 43410PCA9534PWR Datasheet

MFR RecommendedRFQ

TCA9534PWR

Texas InstrumentsIn Stock: 165243TCA9534PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9674PW,112 are selected based on the following critical parameters that determine functional compatibility:

• 8 I/O Channels: All substitutes maintain the same channel count
• I2C Interface: Core communication protocol requirement
• Push-Pull Output Configuration: Electrical output characteristic
• Interrupt Output Capability: Signal notification feature
• 16-TSSOP Package: Physical form factor and pin compatibility
• Surface Mount Technology: Assembly method compatibility
• Supply Voltage Range: Minimum 2.3V support required
• Operating Temperature Range: -40°C to 85°C operational window
• RoHS3 Compliance: Environmental and regulatory requirement

The three substitute parts (PCA9534APWR, PCA9534PWR, and TCA9534PWR) meet these core substitution criteria while operating at reduced clock frequencies (400 kHz instead of 1 MHz), which is acceptable for most I2C applications due to backward compatibility of the I2C protocol.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The PCA9674PW,112 is obsolete, making substitution necessary for new production and long-term availability. All three substitute parts maintain active product status with established supply chains.

Compliance and Certifications: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the original part.

Voltage Supply Compatibility: PCA9534APWR and PCA9534PWR maintain the identical 2.3V ~ 5.5V supply range as the original part. TCA9534PWR extends the lower voltage limit to 1.65V, providing additional flexibility for low-voltage applications while remaining compatible with standard 5V and 3.3V systems.

Clock Frequency Trade-off: The substitute parts operate at 400 kHz instead of 1 MHz. I2C protocol supports multiple clock frequencies with backward compatibility, making 400 kHz operation acceptable for applications not requiring the higher speed of the original part.

Output Current Characteristics: The original part sources 100µA compared to 10mA in substitutes. Applications requiring the specific 100µA source current should be evaluated for compatibility with the 10mA substitute specification.

Frequently Asked Questions (FAQ)

Q: Can PCA9534APWR, PCA9534PWR, or TCA9534PWR be used as direct replacements for PCA9674PW,112?

A: Yes, all three parts are functionally compatible substitutes. They maintain identical I/O channel count, interface protocol, output configuration, interrupt capability, package type, and operating temperature range. The primary differences are reduced clock frequency (400 kHz vs. 1 MHz) and manufacturer change from NXP to Texas Instruments.

Q: What is the impact of the reduced clock frequency from 1 MHz to 400 kHz?

A: The I2C protocol supports multiple clock frequencies with full backward compatibility. Most applications operate at 400 kHz or lower. The reduced frequency does not affect functional compatibility but may impact data throughput in bandwidth-critical applications. Verify that your system design does not require the higher 1 MHz clock speed.

Q: Are the 16-TSSOP packages identical between all parts?

A: Yes, all parts use the 16-TSSOP package with identical dimensions (0.173", 4.40mm Width). Pin assignments and PCB footprints are compatible across all substitute parts.

Q: What is the difference between PCA9534APWR and PCA9534PWR?

A: Both parts are functionally identical I/O expanders with the same electrical specifications. The primary difference is packaging format: PCA9534APWR is supplied in Cut Tape (CT) & Digi-Reel format, while PCA9534PWR is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly requirements.

Q: Why does TCA9534PWR have a lower minimum supply voltage (1.65V vs. 2.3V)?

A: TCA9534PWR is designed to operate at lower voltages, extending compatibility to 1.65V systems. This does not affect compatibility with standard 3.3V or 5V applications. The part remains fully compatible with the original 2.3V ~ 5.5V range.

Q: Are SMBus features on PCA9534 variants required for compatibility?

A: PCA9534APWR and PCA9534PWR include SMBus protocol support in addition to I2C. This is a superset feature that does not affect I2C-only applications. Systems using only I2C protocol will operate identically with or without SMBus capability.

Q: What is the significance of the output source current difference (100µA vs. 10mA)?

A: The original part sources 100µA while substitutes source 10mA. Both sink 25mA identically. Verify that your application does not depend on the specific 100µA source current specification. Most standard I2C applications are compatible with the higher 10mA source current.