PCA9675DB,118 Equivalent & Substitute Parts

Part Overview

The PCA9675DB,118 is a 16-bit I/O expander with I2C interface operating at 1 MHz, manufactured by NXP Semiconductors. This device features push-pull output configuration with interrupt output capability and power-on reset functionality. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The primary substitute maintains functional equivalence while offering improved availability and active product status.

Substiute Parts

PCA9675DB,118

NXP SemiconductorsIn Stock: 724PCA9675DB,118 Datasheet

Current PartRFQ

PCA9675PW,118

NXP SemiconductorsIn Stock: 6889PCA9675PW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9675DB,118 is determined by the following critical parameters:

• I/O Count: 16-bit configuration required
• Interface Protocol: I2C compatibility mandatory
• Clock Frequency: 1 MHz operation
• Supply Voltage Range: 2.3V ~ 5.5V compatibility
• Operating Temperature Range: -40°C ~ 85°C
• Output Configuration: Push-Pull output type
• Interrupt Capability: Interrupt output required
• Mounting: Surface mount technology

The PCA9675PW,118 satisfies all substitution criteria while maintaining functional equivalence across these parameters. The primary difference is the package format transition from 24-SSOP to 24-TSSOP, which represents a standard industry evolution in thermal and mechanical packaging without affecting electrical functionality.

Parameter Comparison

Engineering Selection Recommendations

The PCA9675PW,118 is the direct functional substitute for the obsolete PCA9675DB,118. Selection is based on the following engineering criteria:

Product Status: The PCA9675DB,118 is obsolete, creating supply chain risk. The PCA9675PW,118 maintains active manufacturing status with significantly higher inventory availability (6865 units versus 694 units).

Electrical Equivalence: Both devices operate identically across all critical electrical parameters including supply voltage, operating temperature, clock frequency, and I/O configuration. The PCA9675PW,118 provides enhanced output drive capability (300µA source, 42mA sink versus 100µA source, 25mA sink), which represents a performance improvement without introducing compatibility issues.

Interface Compatibility: The PCA9675PW,118 supports both I2C and SMBus protocols. SMBus is a strict superset of I2C, ensuring full backward compatibility with existing I2C implementations.

Compliance: Both devices maintain ROHS3 compliance and MSL Level 1 rating, meeting environmental and reliability standards.

Package Consideration: The transition from 24-SSOP to 24-TSSOP requires PCB layout modification. The TSSOP package is narrower (4.40mm versus 5.30mm width) and represents current industry standard packaging. Pin count and electrical connectivity remain identical.

Frequently Asked Questions (FAQ)

Q: Can PCA9675PW,118 directly replace PCA9675DB,118 in existing designs?

A: Electrical and functional replacement is direct. PCB layout modification is required due to package format change from 24-SSOP to 24-TSSOP. Pin assignments and electrical characteristics are identical.

Q: What is the difference between I2C and SMBus support?

A: SMBus is a communication protocol based on I2C with additional timing and protocol specifications. Devices supporting SMBus are fully compatible with I2C implementations. The PCA9675PW,118 supports both protocols, ensuring compatibility with existing I2C systems.

Q: Are the output drive capabilities interchangeable?

A: The PCA9675PW,118 provides higher output drive current (300µA source, 42mA sink) compared to the PCA9675DB,118 (100µA source, 25mA sink). This represents improved performance and does not create compatibility issues. Existing designs will function correctly with the higher drive capability.

Q: What are the package dimension differences?

A: The 24-SSOP package measures 0.209" (5.30mm) width, while the 24-TSSOP package measures 0.173" (4.40mm) width. Both packages have identical pin counts and pitch. PCB footprint redesign is necessary for the package transition.

Q: Is compliance maintained with the substitute part?

A: Both devices maintain ROHS3 compliance and MSL Level 1 rating. Environmental and regulatory compliance is preserved with the PCA9675PW,118 substitute.

Q: What inventory status should influence selection?

A: The PCA9675DB,118 has 694 units available but is obsolete. The PCA9675PW,118 has 6865 units available and maintains active product status, providing superior long-term supply chain security.