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PCA8574APW,112 I/O Expander Equivalent & Substitute Parts
Part Overview
The PCA8574APW,112 is an 8-channel I/O expander with I2C interface operating at 400 kHz, manufactured by NXP USA Inc. in a 16-TSSOP surface mount package. This device features push-pull output configuration with 100µA source and 25mA sink current capability, supporting supply voltages from 2.3V to 5.5V across an operating temperature range of -40°C to 85°C.
The PCA8574APW,112 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 8-bit I/O expansion over I2C bus.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of I/O | 8 |
| Interface | I2C |
| Clock Frequency | 400 kHz |
| Interrupt Output | Yes |
| Output Type | Push-Pull |
| Current - Output Source/Sink | 100µA, 25mA |
| Voltage - Supply | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the PCA8574APW,112 is determined by the following critical parameters:
- Number of I/O: Must be 8 channels
- Interface: Must support I2C protocol
- Clock Frequency: Must operate at 400 kHz minimum
- Interrupt Output: Must include interrupt capability
- Output Type: Must be push-pull configuration
- Voltage Supply Range: Must encompass or exceed 2.3V ~ 5.5V
- Operating Temperature: Must support -40°C ~ 85°C minimum
- RoHS Compliance: Must maintain ROHS3 compliance
- Mounting Type: Surface mount only
Substitute parts are grouped into two categories:
Category A - Direct Package Equivalents (16-TSSOP): Parts maintaining identical 16-TSSOP packaging for direct PCB layout compatibility without redesign.
Category B - Functional Equivalents (Alternative Packages): Parts meeting all electrical and functional parameters but in different surface mount packages (16-SOIC, 16-SSOP, 24-QSOP, 24-TQFN, 16-UQFN), requiring PCB layout modification.
Parameter Comparison
| Part Number | Manufacturer | I/O Count | Interface | Clock Freq (kHz) | Output Type | Supply Voltage | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| PCA8574APW,112 | NXP USA Inc. | 8 | I2C | 400 | Push-Pull | 2.3V ~ 5.5V | -40 ~ 85 | 16-TSSOP | Obsolete |
| TCA9534PWR | Texas Instruments | 8 | I2C | 400 | Push-Pull | 1.65V ~ 5.5V | -40 ~ 85 | 16-TSSOP | Active |
| TCA9534DWT | Texas Instruments | 8 | I2C | 400 | Push-Pull | 1.65V ~ 5.5V | -40 ~ 85 | 16-SOIC | Active |
| TCA9534ADWT | Texas Instruments | 8 | I2C | 400 | Push-Pull | 1.65V ~ 5.5V | -40 ~ 85 | 16-SOIC | Active |
| TCA9534ADWR | Texas Instruments | 8 | I2C | 400 | Push-Pull | 1.65V ~ 5.5V | -40 ~ 85 | 16-SOIC | Active |
| TCA9538DBR | Texas Instruments | 8 | I2C | 400 | Push-Pull | 1.65V ~ 5.5V | -40 ~ 85 | 16-SSOP | Active |
| TCA6408ARSVR | Texas Instruments | 8 | I2C, SMBus | 400 | Push-Pull | 1.65V ~ 5.5V | -40 ~ 85 | 16-UQFN | Active |
| PCA9654EDTR2G | onsemi | 8 | I2C | 100 | Push-Pull | 1.65V ~ 5.5V | -55 ~ 125 | 16-TSSOP | Obsolete |
| MAX7324AEG+ | Analog Devices Inc./Maxim Integrated | 8 | I2C | 400 | Push-Pull | 1.71V ~ 5.5V | -40 ~ 125 | 24-QSOP | Active |
| MAX7324ATG+ | Analog Devices Inc./Maxim Integrated | 8 | I2C | 400 | Push-Pull | 1.71V ~ 5.5V | -40 ~ 125 | 24-TQFN | Active |
| MAX7324ATG+T | Analog Devices Inc./Maxim Integrated | 8 | I2C | 400 | Push-Pull | 1.71V ~ 5.5V | -40 ~ 125 | 24-TQFN | Active |
Engineering Selection Recommendations
Primary Recommendation - Direct Package Replacement:
TCA9534PWR (Texas Instruments) is the preferred direct substitute for PCA8574APW,112. This part maintains identical 16-TSSOP packaging, eliminating PCB redesign requirements. The TCA9534PWR meets all functional parameters with expanded supply voltage range (1.65V ~ 5.5V) and active product status, ensuring long-term availability and supply chain stability.
Secondary Recommendations - Functional Equivalents:
For applications where package footprint modification is acceptable, the following active parts provide equivalent functionality:
- TCA9534DWT, TCA9534ADWT, TCA9534ADWR (Texas Instruments, 16-SOIC package): Active status with full parameter compliance
- TCA9538DBR (Texas Instruments, 16-SSOP package): Active status with SMBus compatibility option via TCA6408ARSVR
- TCA6408ARSVR (Texas Instruments, 16-UQFN package): Smallest footprint option with SMBus protocol support
- MAX7324 series (Analog Devices Inc./Maxim Integrated, 24-QSOP or 24-TQFN packages): Extended operating temperature range (-40°C ~ 125°C) and active status
Obsolete Part Consideration:
PCA9654EDTR2G (onsemi, 16-TSSOP) shares package compatibility but operates at reduced clock frequency (100 kHz vs. 400 kHz). This part is suitable only for applications with lower I2C bus speed requirements and is not recommended as a primary substitute due to obsolete status.
All recommended substitutes maintain ROHS3 compliance and MSL 1 rating consistent with the original part.
Frequently Asked Questions (FAQ)
Q: Can TCA9534PWR directly replace PCA8574APW,112 without PCB modification?
A: Yes. TCA9534PWR maintains identical 16-TSSOP packaging and pin configuration. No PCB layout changes are required. The part is pin-compatible and functionally equivalent across all critical parameters.
Q: What is the key difference between TCA9534PWR and MAX7324 series substitutes?
A: TCA9534PWR maintains the original 16-TSSOP package and -40°C ~ 85°C operating temperature range. MAX7324 series parts offer extended temperature operation (-40°C ~ 125°C) but require different package footprints (24-QSOP or 24-TQFN), necessitating PCB redesign.
Q: Is PCA9654EDTR2G a suitable substitute?
A: PCA9654EDTR2G shares the 16-TSSOP package but operates at 100 kHz clock frequency versus the original 400 kHz specification. This part is suitable only for I2C applications with lower bus speed requirements. Both the original and substitute parts are obsolete.
Q: What is the supply voltage compatibility range for substitute parts?
A: The original PCA8574APW,112 operates from 2.3V ~ 5.5V. All recommended substitutes support minimum 1.65V ~ 5.5V or 1.71V ~ 5.5V ranges, which encompass the original specification. Designs operating at 2.3V minimum voltage are compatible with all listed substitutes.
Q: Do substitute parts maintain interrupt output capability?
A: Yes. All recommended substitute parts include interrupt output functionality with push-pull configuration, matching the original PCA8574APW,112 specification.
Q: Which substitute offers the smallest PCB footprint?
A: TCA6408ARSVR in 16-UQFN (2.6x1.8mm) package provides the smallest footprint. This part also supports SMBus protocol in addition to I2C, offering enhanced compatibility for mixed-protocol applications.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All recommended substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original part's environmental certifications.
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