PCA9554APWR I/O Expander Equivalent & Substitute Parts

Part Overview

The PCA9554APWR is an 8-bit I/O expander interface circuit 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 inventory availability. The part operates across a supply voltage range of 2.3V to 5.5V and supports push-pull output configuration with 10mA source and 25mA sink current capability. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term component sourcing.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Base Product Number	PCA9554
Number of I/O	8
Interface	I2C, SMBus
Clock Frequency	400 kHz
Voltage Supply Range	2.3V ~ 5.5V
Output Type	Push-Pull
Current Output Source/Sink	10mA, 25mA
Operating Temperature	-40°C ~ 85°C
Package	16-TSSOP (0.173", 4.40mm Width)
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9554APWR is determined by the following critical parameters: 8 I/O count, I2C/SMBus interface support, 400 kHz clock frequency, 16-TSSOP package compatibility, push-pull output configuration, and operating temperature range of -40°C to 85°C. Substitute parts must maintain these core electrical and mechanical specifications to ensure drop-in compatibility within existing circuit designs.

The substitute parts are grouped into two categories:

Direct Substitutes (Identical Specifications): Parts that match all key parameters including voltage supply range (2.3V ~ 5.5V), output current ratings (10mA source, 25mA sink), and SMBus interface support.

Compatible Alternatives (Extended Specifications): Parts that exceed minimum requirements in voltage supply range or feature set while maintaining core I/O, interface, frequency, and package specifications. These parts offer broader operational flexibility but remain functionally compatible.

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Frequency	Voltage Supply	Output Type	Current Source/Sink	Package	Operating Temp	Product Status
PCA9554APWR	Texas Instruments	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Last Time Buy
TCA9554APWR	Texas Instruments	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9554PW,112	NXP USA Inc.	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9554PW,118	NXP USA Inc.	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA8574APW,118	NXP USA Inc.	8	I2C	400 kHz	2.3V ~ 5.5V	Push-Pull	100µA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9554APW,118	NXP Semiconductors	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9554BPWJ	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9554CPWJ	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9554PW/Q900,118	NXP USA Inc.	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCAL9554BPWJ	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Open Drain, Push-Pull	10mA, 25mA	16-TSSOP	-40°C ~ 85°C	Active
PCA9654EDTR2G	onsemi	8	I2C	100 kHz	1.65V ~ 5.5V	Not Specified	Not Specified	16-TSSOP	-55°C ~ 125°C	Obsolete

Engineering Selection Recommendations

Primary Recommendation: TCA9554APWR (Texas Instruments) or PCA9554PW,118 (NXP USA Inc.) are the preferred substitutes. Both maintain Active product status with full inventory availability. TCA9554APWR extends the minimum voltage supply to 1.65V, providing broader operational flexibility while maintaining all other electrical specifications identical to the original part. PCA9554PW,118 matches the exact voltage supply range of the original PCA9554APWR and is available in higher quantities.

Secondary Recommendations: PCA9554APW,118 (NXP Semiconductors) and PCA9554BPWJ (NXP USA Inc.) are functionally equivalent alternatives. PCA9554BPWJ offers extended minimum voltage supply (1.65V) and is available in Tape & Reel packaging. Both maintain full SMBus compatibility and identical I/O specifications.

Extended Temperature Range Alternative: PCAL9554BPWJ (NXP USA Inc.) provides dual output type capability (Open Drain and Push-Pull) with extended minimum voltage supply (1.65V). This part is suitable for applications requiring additional output flexibility.

Not Recommended: PCA8574APW,118 exhibits reduced source current capability (100µA versus 10mA) and lacks SMBus interface support, limiting its suitability as a direct substitute. PCA9654EDTR2G is Obsolete with reduced clock frequency (100 kHz versus 400 kHz), making it unsuitable for applications requiring 400 kHz I2C/SMBus operation.

Frequently Asked Questions (FAQ)

Q: Can PCA9554PW,118 replace PCA9554APWR in existing designs? A: Yes. PCA9554PW,118 maintains identical electrical specifications including voltage supply range (2.3V ~ 5.5V), I/O count (8), interface (I2C, SMBus), clock frequency (400 kHz), output type (Push-Pull), and current ratings (10mA source, 25mA sink). The 16-TSSOP package is mechanically compatible. The primary difference is packaging format (Tube versus Cut Tape & Digi-Reel).

Q: What is the difference between TCA9554APWR and PCA9554APWR? A: TCA9554APWR extends the minimum supply voltage to 1.65V compared to PCA9554APWR's 2.3V minimum. All other specifications are identical. TCA9554APWR is manufactured by Texas Instruments and maintains Active product status with higher inventory availability.

Q: Is PCA9554BPWJ compatible with PCA9554APWR? A: Yes. PCA9554BPWJ is compatible with identical I/O count (8), interface (I2C, SMBus), clock frequency (400 kHz), output type (Push-Pull), and current ratings. PCA9554BPWJ extends minimum voltage supply to 1.65V and is available in Tape & Reel packaging.

Q: Why is PCA8574APW,118 not recommended as a substitute? A: PCA8574APW,118 has reduced source current capability (100µA versus 10mA) and supports only I2C interface without SMBus. These differences may cause functional incompatibility in designs requiring SMBus protocol or higher source current output.

Q: Can PCAL9554BPWJ be used instead of PCA9554APWR? A: Yes, with consideration for output type flexibility. PCAL9554BPWJ supports both Open Drain and Push-Pull output modes, extends minimum voltage supply to 1.65V, and maintains all core I/O and interface specifications. The dual output capability provides additional design flexibility.

Q: What packaging options are available for substitutes? A: Substitute parts are available in Cut Tape (CT) & Digi-Reel, Tube, and Tape & Reel (TR) packaging formats. All maintain the 16-TSSOP (0.173", 4.40mm Width) mechanical package specification. Packaging selection depends on procurement and assembly requirements.

Q: Is PCA9654EDTR2G a viable substitute? A: No. PCA9654EDTR2G operates at 100 kHz clock frequency versus the required 400 kHz, lacks SMBus interface support, and is classified as Obsolete. These limitations make it unsuitable for applications requiring 400 kHz I2C/SMBus operation.

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