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PCA9554PW I/O Expander Equivalent & Substitute Parts
Part Overview
The PCA9554PW is an 8-bit I/O expander with I2C and SMBus interface operating at 400 kHz, manufactured by Texas Instruments in a 16-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides push-pull output capability with 10mA source and 25mA sink current, power-on reset (POR) feature, and interrupt output functionality. Supply voltage range is 2.3V to 5.5V with operating temperature range of -40°C to 85°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of I/O | 8 |
| Interface | I2C, SMBus |
| Clock Frequency | 400 kHz |
| Interrupt Output | Yes |
| Output Type | Push-Pull |
| Current - Output Source/Sink | 10mA, 25mA |
| Voltage - Supply | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the PCA9554PW is determined by the following critical parameters: 8 I/O count, I2C/SMBus interface support, 400 kHz clock frequency, push-pull output type, 10mA/25mA output current capability, 2.3V to 5.5V supply voltage range, -40°C to 85°C operating temperature, 16-TSSOP package, and ROHS3 compliance.
Substitute parts are grouped into two categories:
Direct Equivalents (Same Base Product Number - PCA9554 Series): Parts with identical electrical specifications and the same base product number (PCA9554) from Texas Instruments and NXP USA Inc. These include TCA9554PWR, PCA9554APW,118, PCA9554PW,112, PCA9554BPWJ, PCA9554CPWJ, and PCA9554PW,118. Differences exist only in packaging format (Cut Tape, Tube, Tape & Reel) and voltage supply range variations (1.65V ~ 5.5V for some variants).
Functional Equivalents (Different Base Product Number): Parts meeting the same electrical and mechanical requirements but with different base product numbers. These include PCA8574APW,118 (NXP, I2C only, no SMBus), PCA9654EDTR2G (onsemi, 100 kHz clock frequency, -55°C ~ 125°C operating range), PI4IOE5V9554ALEX, and PI4IOE5V9554LE (Diodes Incorporated, 400 kHz I2C interface).
Parameter Comparison
| Part Number | Manufacturer | I/O Count | Interface | Clock Frequency | Supply Voltage | Operating Temp | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| PCA9554PW | Texas Instruments | 8 | I2C, SMBus | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Obsolete |
| TCA9554PWR | Texas Instruments | 8 | I2C, SMBus | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA9554APW,118 | NXP Semiconductors | 8 | I2C, SMBus | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA9554PW,112 | NXP USA Inc. | 8 | I2C, SMBus | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA8574APW,118 | NXP USA Inc. | 8 | I2C | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA9554BPWJ | NXP USA Inc. | 8 | I2C, SMBus | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA9554CPWJ | NXP USA Inc. | 8 | I2C, SMBus | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA9554PW,118 | NXP USA Inc. | 8 | I2C, SMBus | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PCA9654EDTR2G | onsemi | 8 | I2C | 100 kHz | 1.65V ~ 5.5V | -55°C ~ 125°C | 16-TSSOP | Obsolete |
| PI4IOE5V9554ALEX | Diodes Incorporated | 8 | I2C | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
| PI4IOE5V9554LE | Diodes Incorporated | 8 | I2C | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Active |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility): TCA9554PWR (Texas Instruments) and PCA9554APW,118 (NXP Semiconductors) are recommended as primary substitutes. Both are active products with identical electrical specifications to the PCA9554PW, including 8 I/O, I2C/SMBus interface, 400 kHz clock frequency, push-pull output, and 16-TSSOP package. TCA9554PWR offers extended lower supply voltage support (1.65V minimum) compared to the original part (2.3V minimum). Both are ROHS3 compliant with MSL 1 rating.
Secondary Substitutes (Conditional Use): PCA9554BPWJ and PCA9554CPWJ (NXP USA Inc.) are active products with identical functionality but extended lower supply voltage range (1.65V ~ 5.5V). These are suitable for applications requiring lower voltage operation. PCA9554PW,112 and PCA9554PW,118 (NXP USA Inc.) maintain the original 2.3V ~ 5.5V supply range and are available in different packaging formats.
Limited Compatibility Substitutes: PCA8574APW,118 (NXP USA Inc.) supports I2C interface only without SMBus capability, making it suitable only for applications not requiring SMBus protocol. PI4IOE5V9554ALEX and PI4IOE5V9554LE (Diodes Incorporated) support I2C interface only without SMBus, but maintain 400 kHz clock frequency and identical I/O count. PCA9654EDTR2G (onsemi) operates at reduced 100 kHz clock frequency and is obsolete; use only if legacy system compatibility is required.
Packaging Considerations: Substitutes are available in Cut Tape (CT) & Digi-Reel, Tube, and Tape & Reel (TR) packaging formats. Selection depends on procurement and assembly requirements. All substitutes maintain the 16-TSSOP (0.173", 4.40mm Width) package footprint.
Frequently Asked Questions (FAQ)
Q: Can TCA9554PWR replace PCA9554PW in all applications? A: Yes, TCA9554PWR is a direct functional equivalent with identical electrical specifications. The extended lower supply voltage range (1.65V vs. 2.3V minimum) provides additional design flexibility without compromising compatibility.
Q: What is the difference between PCA9554 and PCA8574 I/O expanders? A: Both devices provide 8 I/O with I2C interface and 400 kHz clock frequency in 16-TSSOP package. PCA8574APW,118 supports I2C interface only, while PCA9554PW supports both I2C and SMBus protocols. Applications requiring SMBus functionality must use PCA9554 series.
Q: Is PCA9654EDTR2G suitable as a substitute? A: PCA9654EDTR2G operates at 100 kHz clock frequency compared to the 400 kHz specification of PCA9554PW. This reduced clock speed may impact I2C communication timing in systems designed for 400 kHz operation. Use only if system timing requirements permit 100 kHz operation.
Q: What are the packaging format differences among substitutes? A: Cut Tape (CT) & Digi-Reel packaging is suitable for automated assembly lines. Tube packaging is used for manual assembly or lower-volume applications. Tape & Reel (TR) packaging is standard for high-volume production. All formats contain identical components; selection depends on procurement and assembly process requirements.
Q: Can PI4IOE5V9554ALEX replace PCA9554PW? A: PI4IOE5V9554ALEX provides 8 I/O with I2C interface and 400 kHz clock frequency in identical 16-TSSOP package. However, it supports I2C interface only without SMBus capability. Use only in applications not requiring SMBus protocol support.
Q: Are all substitutes ROHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original PCA9554PW specifications.
Q: What is the inventory status for substitute parts? A: TCA9554PWR has 42,131 units in stock. PCA9554APW,118 has 2,100 units. PCA9554PW,112 has 3,300 units. PCA9554BPWJ has 2,400 units. PCA9554CPWJ has 3,784 units. PCA9554PW,118 has 2,752 units. PI4IOE5V9554ALEX has 11,489 units. PI4IOE5V9554LE has 10,994 units. PCA9654EDTR2G has 10,214 units.
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