PCA9555DBQR Equivalent & Substitute Parts

Part Overview

The PCA9555DBQR is a 16-bit I/O expander interface component manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The component provides 16 programmable I/O lines with push-pull output configuration, suitable for applications requiring expanded digital I/O capabilities in space-constrained designs. Alternative equivalent parts are necessary for new designs or when inventory of the primary part becomes unavailable.

Substiute Parts

PCA9555DBQR

Texas InstrumentsIn Stock: 5510PCA9555DBQR Datasheet

Current PartRFQ

TCA9555DBR

Texas InstrumentsIn Stock: 2447TCA9555DBR Datasheet

MFR RecommendedRFQ

MAX7313AEG+

Analog Devices Inc./Maxim IntegratedIn Stock: 2060MAX7313AEG+ Datasheet

MFR RecommendedRFQ

MAX7313AEG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 8167MAX7313AEG+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9555DBQR is determined by the following critical parameters: 16 I/O count, I2C/SMBus interface support, 400 kHz clock frequency, surface mount packaging, and RoHS3 compliance. The substitute parts identified maintain these core functional requirements while differing in specific electrical characteristics and packaging configurations.

TCA9555DBR (Texas Instruments) qualifies as a direct functional equivalent, sharing identical I/O count, interface protocol, and clock frequency. This part operates across an extended supply voltage range (1.65V ~ 5.5V) compared to the main part, with improved moisture sensitivity rating (MSL 1 vs. MSL 2). The primary distinction is packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and active product status.

MAX7313AEG+ and MAX7313AEG+T (Analog Devices Inc./Maxim Integrated) maintain the 16 I/O count, I2C/SMBus interface, and 400 kHz clock frequency. These parts differ in output configuration (open drain versus push-pull), current sourcing capability (50mA versus 10mA/25mA), and supply voltage range (2V ~ 3.6V). The extended operating temperature range (-40°C ~ 125°C) and PWM feature availability distinguish these alternatives. Packaging differs between tube (MAX7313AEG+) and cut tape (MAX7313AEG+T) formats.

Parameter Comparison

Engineering Selection Recommendations

TCA9555DBR is the preferred substitute for direct replacement applications. This part maintains identical functional specifications and output characteristics while offering active product status and improved moisture sensitivity rating. The extended supply voltage range (1.65V ~ 5.5V) provides additional design flexibility for low-voltage applications. Packaging format differences (Cut Tape & Digi-Reel) do not affect electrical compatibility.

MAX7313AEG+ and MAX7313AEG+T are suitable alternatives when output configuration flexibility is acceptable. The open-drain output topology requires external pull-up resistors, differing from the push-pull configuration of the primary part. The higher current sourcing capability (50mA) accommodates applications with greater load requirements. The restricted supply voltage range (2V ~ 3.6V) limits applicability to lower-voltage systems. Extended operating temperature range (-40°C ~ 125°C) benefits high-temperature environments. Both variants maintain active product status and RoHS3 compliance.

All substitute parts maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can TCA9555DBR replace PCA9555DBQR in existing designs? A: Yes. TCA9555DBR maintains identical I/O count, interface protocol, clock frequency, output type, and current specifications. The extended supply voltage range (1.65V ~ 5.5V) provides backward compatibility with designs operating at 2.3V ~ 5.5V. Packaging format differences do not affect electrical performance.

Q: What are the key differences between MAX7313AEG+ variants and the PCA9555DBQR? A: MAX7313AEG+ and MAX7313AEG+T employ open-drain output configuration requiring external pull-up resistors, whereas PCA9555DBQR uses push-pull outputs. The MAX7313 series provides higher current sourcing (50mA versus 10mA/25mA) and extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). Supply voltage range is restricted to 2V ~ 3.6V. Packaging differs between tube and cut tape formats.

Q: Are package differences between 24-SSOP and 24-QSOP significant for substitution? A: Package type differences require PCB layout verification. While both are 24-pin surface mount packages, physical dimensions and pin spacing differ. 24-SSOP (0.154" width) and 24-QSOP (0.154" width) share similar footprints but require confirmation against specific board design specifications before implementation.

Q: Which substitute part is recommended for new designs? A: TCA9555DBR is recommended for new designs requiring direct functional equivalence. MAX7313AEG+T is recommended when higher current sourcing capability or extended temperature range is required, provided the design accommodates open-drain output configuration and the restricted 2V ~ 3.6V supply voltage range.

Q: Do all substitute parts maintain regulatory compliance? A: Yes. All substitute parts (TCA9555DBR, MAX7313AEG+, MAX7313AEG+T) are ROHS3 compliant and REACH unaffected, matching the regulatory status of PCA9555DBQR.