PCA9555DB,112 Equivalent & Substitute Parts

Part Overview

The PCA9555DB,112 is a 16-bit I/O expander interface circuit designed for I2C and SMBus communication at 400 kHz. Manufactured by NXP USA Inc., this device operates across a supply voltage range of 2.3V to 5.5V and supports push-pull output configuration with interrupt capability. The component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

PCA9555DB,112

NXP USA Inc.In Stock: 1177PCA9555DB,112 Datasheet

Current PartRFQ

MAX7312AAG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 664MAX7312AAG+T Datasheet

MFR RecommendedRFQ

PCA9535DB

Texas InstrumentsIn Stock: 976PCA9535DB Datasheet

MFR RecommendedRFQ

PCA9555DBR

Texas InstrumentsIn Stock: 16345PCA9555DBR Datasheet

MFR RecommendedRFQ

TCA9535DBR

Texas InstrumentsIn Stock: 2445TCA9535DBR Datasheet

MFR RecommendedRFQ

TCA9555DBR

Texas InstrumentsIn Stock: 2447TCA9555DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9555DB,112 is determined by the following critical parameters: 16-bit I/O configuration, I2C/SMBus interface protocol, 400 kHz clock frequency, 24-SSOP package form factor, push-pull output topology, and interrupt output capability. All identified substitute parts maintain these core electrical and mechanical specifications.

The substitute parts are grouped into two categories based on supply voltage compatibility:

Category 1 - Full Voltage Range Compatibility (2.3V ~ 5.5V): PCA9535DB and PCA9555DBR maintain identical supply voltage specifications to the original part, ensuring direct substitution in existing designs without circuit modification.

Category 2 - Extended Lower Voltage Support (1.65V ~ 5.5V): TCA9535DBR and TCA9555DBR support lower minimum supply voltages, providing additional design flexibility for low-power applications while maintaining upper voltage compatibility.

Category 3 - Enhanced Current Capability (2V ~ 5.5V): MAX7312AAG+T offers increased output source/sink current (31mA, 43mA versus 10mA, 25mA) with extended operating temperature range (-40°C ~ 125°C), suitable for applications requiring higher drive capability.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications: PCA9555DBR is the primary recommended substitute. This part maintains all electrical parameters of the original PCA9555DB,112 while offering active product status and significantly higher inventory availability (16,300 units). The packaging format (Cut Tape & Digi-Reel) supports both prototype and production volume requirements.

For Applications Requiring Extended Supply Voltage Range: TCA9535DBR and TCA9555DBR support minimum supply voltages as low as 1.65V, enabling deployment in low-power and battery-operated systems. Both parts maintain active product status and are available in production quantities.

For High-Current Output Applications: MAX7312AAG+T provides enhanced output drive capability (31mA source, 43mA sink) and extended operating temperature range to 125°C. This substitute is appropriate for applications requiring higher load current or operation in elevated temperature environments. Product status is active with 634 units in inventory.

For Designs Transitioning from Obsolete Components: PCA9535DB represents an intermediate option with identical electrical specifications to the original part. However, this part carries Last Time Buy status, indicating limited future availability. Selection should prioritize PCA9555DBR or TCA9555DBR for long-term design sustainability.

Frequently Asked Questions (FAQ)

Q: Can PCA9555DBR be used as a direct replacement for PCA9555DB,112? A: Yes. PCA9555DBR maintains identical electrical specifications including supply voltage (2.3V ~ 5.5V), operating temperature range (-40°C ~ 85°C), output current ratings (10mA, 25mA), and 24-SSOP package form factor. The primary difference is product status (active versus obsolete) and packaging format (Cut Tape & Digi-Reel versus tube).

Q: What is the difference between PCA9555DBR and TCA9555DBR? A: Both parts provide 16-bit I/O expansion with I2C/SMBus interface at 400 kHz. The primary distinction is minimum supply voltage: PCA9555DBR operates from 2.3V minimum, while TCA9555DBR operates from 1.65V minimum. Output current specifications and operating temperature range are identical. Selection depends on circuit supply voltage requirements.

Q: Is MAX7312AAG+T compatible with existing PCB layouts designed for PCA9555DB,112? A: Yes, from a package perspective. MAX7312AAG+T uses the same 24-SSOP form factor and pinout. However, the enhanced output current capability (31mA, 43mA) may require circuit design review if current-limiting resistors or load impedances were optimized for the original 10mA, 25mA specification.

Q: Why does PCA9535DB show Last Time Buy status? A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part number. While inventory remains available, future procurement may become unavailable. For new designs or long-term production, selection of parts with Active status (PCA9555DBR, TCA9535DBR, TCA9555DBR, MAX7312AAG+T) is recommended.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All identified substitute parts maintain ROHS3 compliance, matching the environmental and regulatory status of the original PCA9555DB,112.

Q: What packaging options are available for substitute parts? A: PCA9555DBR, TCA9535DBR, and TCA9555DBR are supplied in Cut Tape (CT) & Digi-Reel format. PCA9535DB is supplied in Tube packaging. MAX7312AAG+T is supplied in Tape & Reel (TR) format. Selection should align with assembly process requirements and volume specifications.