PCAL9554BBSHP Equivalent & Substitute Parts

Part Overview

The PCAL9554BBSHP is an 8-bit I/O expander manufactured by NXP USA Inc., designed for I2C and SMBus communication at 400 kHz. The device features open drain and push-pull output options with interrupt capability and power-on reset functionality. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Number of I/O	8
Interface	I2C, SMBus
Clock Frequency	400 kHz
Voltage Supply Range	1.65V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Output Type	Open Drain, Push-Pull
Current Output Source/Sink	10mA, 25mA
Interrupt Output	Yes
Features	POR
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PCAL9554BBSHP is determined by the following critical parameters: 8-bit I/O count, I2C/SMBus interface support at 400 kHz, voltage supply range of 1.65V to 5.5V, operating temperature range of -40°C to 85°C, interrupt output capability, and surface mount packaging. Substitute parts must maintain compatibility across these core electrical and functional specifications.

The substitute parts are grouped into two categories based on package type and electrical characteristics:

Category 1: NXP PCAL Series (Package Compatibility) PCAL6408ABSHP maintains identical electrical specifications and package form factor (16-HVQFN), with the distinction of active product status and different packaging format (Cut Tape & Digi-Reel versus Tape & Reel).

Category 2: Texas Instruments TCA Series (Functional Equivalence) TCA6408APWR, TCA6408AQPWRQ1, TCA6408ARSVR, TCA9534ADWR, TCA9534ADWT, and TCA9534PWR provide functional equivalence with identical I/O count, interface protocol, clock frequency, and voltage specifications. These parts differ in package form factor (16-TSSOP, 16-UQFN, or 16-SOIC) and operating temperature ranges.

Category 3: Analog Devices/Maxim Integrated MAX Series (Extended Temperature Range) MAX7324AEG+T and MAX7324ATG+ offer 8-bit I/O expansion with I2C interface at 400 kHz. These parts feature extended operating temperature range (-40°C to 125°C) and higher output current capability (20mA), with different package configurations (24-QSOP and 24-TQFN).

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Frequency	Voltage Supply	Operating Temp	Output Type	Current Output	Package	Product Status
PCAL9554BBSHP	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Open Drain, Push-Pull	10mA, 25mA	16-HVQFN (3x3)	Obsolete
PCAL6408ABSHP	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Open Drain, Push-Pull	10mA, 25mA	16-HVQFN (3x3)	Active
MAX7324AEG+T	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	1.71V ~ 5.5V	-40°C ~ 125°C	Push-Pull	20mA	24-QSOP	Active
MAX7324ATG+	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	1.71V ~ 5.5V	-40°C ~ 125°C	Push-Pull	20mA	24-TQFN (4x4)	Active
TCA6408APWR	Texas Instruments	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	10mA, 25mA	16-TSSOP	Active
TCA6408AQPWRQ1	Texas Instruments	8	I2C, SMBus	400 kHz	1.65V ~ 3.6V	-40°C ~ 125°C	Push-Pull	10mA, 25mA	16-TSSOP	Active
TCA6408ARSVR	Texas Instruments	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	10mA, 25mA	16-UQFN (2.6x1.8)	Active
TCA9534ADWR	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Not specified	16-SOIC	Active
TCA9534ADWT	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Not specified	16-SOIC	Active
TCA9534DWR	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Not specified	16-SOIC	Active
TCA9534PWR	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	10mA, 25mA	16-TSSOP	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility) PCAL6408ABSHP is the recommended direct replacement. It maintains identical electrical specifications, package form factor, and functional characteristics as the PCAL9554BBSHP. The primary difference is active product status, ensuring long-term availability and supply chain continuity. This part is suitable for designs requiring no PCB layout modifications.

Package-Dependent Alternatives TCA6408APWR and TCA9534PWR are suitable for applications where 16-TSSOP or 16-SOIC packages are acceptable. These parts maintain full electrical compatibility with the original specification, including voltage supply range, operating temperature, and I2C/SMBus interface support. TCA6408ARSVR offers a compact 16-UQFN package for space-constrained applications while maintaining identical electrical parameters.

Automotive-Grade Option TCA6408AQPWRQ1 is qualified to AEC-Q100 automotive standards with extended operating temperature range (-40°C to 125°C). This part is appropriate for automotive applications requiring higher temperature performance. Note that the voltage supply range is reduced to 1.65V to 3.6V, requiring verification against system requirements.

Extended Temperature Performance MAX7324AEG+T and MAX7324ATG+ provide extended operating temperature range (-40°C to 125°C) and higher output current capability (20mA). These parts are suitable for industrial and high-temperature applications. Package changes (24-QSOP or 24-TQFN) require PCB layout modifications. SMBus support is not available on these parts; I2C interface only.

Compliance and Certification All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part. Moisture sensitivity level remains at MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can PCAL6408ABSHP be used as a direct drop-in replacement for PCAL9554BBSHP? A: Yes. PCAL6408ABSHP maintains identical electrical specifications, package form factor (16-HVQFN 3x3), and functional characteristics. The only difference is product status (active versus obsolete) and packaging format (Cut Tape & Digi-Reel versus Tape & Reel). No design changes are required.

Q: What are the key differences between NXP PCAL and Texas Instruments TCA series substitutes? A: Both series provide 8-bit I/O expansion with I2C/SMBus interface at 400 kHz and identical voltage supply ranges. Primary differences are package form factors (HVQFN, TSSOP, UQFN, or SOIC) and output type options. NXP PCAL series offers both open drain and push-pull outputs, while TCA series provides push-pull only. Package selection depends on PCB layout constraints.

Q: Are MAX7324 parts compatible with SMBus applications? A: No. MAX7324AEG+T and MAX7324ATG+ support I2C interface only. SMBus support is not available. These parts are suitable for I2C-only applications requiring extended temperature performance (-40°C to 125°C) and higher output current (20mA).

Q: What is the impact of using TCA6408AQPWRQ1 instead of the standard TCA6408APWR? A: TCA6408AQPWRQ1 is automotive-grade (AEC-Q100 qualified) with extended operating temperature range (-40°C to 125°C). The voltage supply range is reduced to 1.65V to 3.6V. Verify that your system operates within this reduced voltage range before substitution.

Q: Can I use a 24-pin package substitute (MAX7324) in place of a 16-pin package (PCAL9554BBSHP)? A: No. Package changes require PCB layout modifications. MAX7324 parts in 24-QSOP or 24-TQFN packages have different pin configurations and footprints. Use only if PCB redesign is acceptable.

Q: What is the difference between TCA9534ADWT and TCA9534DWR? A: Both are 16-SOIC package variants with identical electrical specifications. TCA9534ADWT is supplied in Tape & Reel packaging, while TCA9534DWR is supplied in Cut Tape & Digi-Reel format. Electrical performance is identical; packaging format differs based on procurement requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original PCAL9554BBSHP specification.

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