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PCA8574ATS,118 Equivalent & Substitute Parts
Part Overview
The PCA8574ATS,118 is an 8-bit I/O Expander interface IC operating at 400 kHz I2C bus speed in a 20-SSOP package. Manufactured by NXP USA Inc., this component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part provides 8 I/O lines with push-pull output configuration, interrupt output capability, and power-on reset (POR) feature, suitable for applications requiring I2C-based I/O expansion with moderate clock frequency operation.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PCA8574ATS,118 |
| Manufacturer | NXP USA Inc. |
| Number of I/O | 8 |
| Interface | I2C |
| Clock Frequency | 400 kHz |
| Voltage Supply Range | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 20-LSSOP (0.173", 4.40mm Width) |
| Output Type | Push-Pull |
| Interrupt Output | Yes |
| Current - Output Source/Sink | 100µA, 25mA |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the PCA8574ATS,118 is determined by the following critical parameters: 8 I/O lines, I2C interface protocol, 400 kHz clock frequency operation, push-pull output configuration, interrupt output capability, and surface mount packaging. Substitute parts must maintain functional equivalence across these core specifications.
The substitute parts are grouped into two categories based on package compatibility and operational characteristics:
Category 1: Direct Package Compatibility (20-SSOP/20-TSSOP)
- PCF8574ATS/3,118 (NXP, 20-SSOP, 100 kHz clock)
- PCF8574APWR (Texas Instruments, 20-TSSOP, 100 kHz clock)
Category 2: Alternative Package Formats with 400 kHz Operation
- TCA9534ADWT (Texas Instruments, 16-SOIC, 400 kHz)
- TCA9534PWR (Texas Instruments, 16-TSSOP, 400 kHz)
- TCA6408APWR (Texas Instruments, 16-TSSOP, 400 kHz, SMBus compatible)
- TCA6408ARSVR (Texas Instruments, 16-UQFN, 400 kHz, SMBus compatible)
- MAX7324AEG+ (Analog Devices/Maxim, 24-QSOP, 400 kHz)
- MAX7324ATG+ (Analog Devices/Maxim, 24-TQFN, 400 kHz)
- MAX7324ATG+T (Analog Devices/Maxim, 24-TQFN, 400 kHz)
Parameter Comparison
| Part Number | Manufacturer | I/O Count | Interface | Clock Frequency | Voltage Supply | Temp Range | Package | Output Type | Interrupt | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| PCA8574ATS,118 | NXP USA Inc. | 8 | I2C | 400 kHz | 2.3V ~ 5.5V | -40°C ~ 85°C | 20-LSSOP | Push-Pull | Yes | Obsolete |
| PCF8574ATS/3,118 | NXP USA Inc. | 8 | I2C | 100 kHz | 2.5V ~ 6V | -40°C ~ 85°C | 20-LSSOP | Push-Pull | Yes | Active |
| PCF8574APWR | Texas Instruments | 8 | I2C | 100 kHz | 2.5V ~ 6V | -40°C ~ 85°C | 20-TSSOP | Push-Pull | Yes | Active |
| TCA9534ADWT | Texas Instruments | 8 | I2C | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-SOIC | Push-Pull | Yes | Active |
| TCA9534PWR | Texas Instruments | 8 | I2C | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Push-Pull | Yes | Active |
| TCA6408APWR | Texas Instruments | 8 | I2C, SMBus | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-TSSOP | Push-Pull | Yes | Active |
| TCA6408ARSVR | Texas Instruments | 8 | I2C, SMBus | 400 kHz | 1.65V ~ 5.5V | -40°C ~ 85°C | 16-UQFN | Push-Pull | Yes | Active |
| MAX7324AEG+ | Analog Devices/Maxim | 8 | I2C | 400 kHz | 1.71V ~ 5.5V | -40°C ~ 125°C | 24-QSOP | Push-Pull | Yes | Active |
| MAX7324ATG+ | Analog Devices/Maxim | 8 | I2C | 400 kHz | 1.71V ~ 5.5V | -40°C ~ 125°C | 24-TQFN | Push-Pull | Yes | Active |
| MAX7324ATG+T | Analog Devices/Maxim | 8 | I2C | 400 kHz | 1.71V ~ 5.5V | -40°C ~ 125°C | 24-TQFN | Push-Pull | Yes | Active |
Engineering Selection Recommendations
For Direct Replacement with Minimal Design Changes: PCF8574ATS/3,118 and PCF8574APWR maintain the same 20-pin SSOP/TSSOP footprint as the original PCA8574ATS,118. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. The primary trade-off is reduced clock frequency (100 kHz vs. 400 kHz), which is acceptable for applications not requiring high-speed I2C operation. PCF8574ATS/3,118 is NXP-sourced for design continuity, while PCF8574APWR offers higher inventory availability through Texas Instruments.
For 400 kHz Clock Frequency Retention: TCA9534ADWT, TCA9534PWR, TCA6408APWR, and TCA6408ARSVR maintain the 400 kHz clock frequency specification. These parts require PCB layout modifications due to different package formats (16-pin SOIC, 16-pin TSSOP, or 16-pin UQFN). TCA6408 variants add SMBus protocol compatibility. All are active products with ROHS3 compliance.
For Extended Temperature Range: MAX7324 variants (AEG+, ATG+, ATG+T) support -40°C to 125°C operating temperature, exceeding the original -40°C to 85°C range. These parts require significant PCB redesign due to 24-pin packaging. All MAX7324 variants are active products with ROHS3 compliance and represent the widest supply voltage range (1.71V ~ 5.5V).
All substitute parts maintain push-pull output configuration, 8 I/O lines, interrupt output capability, and POR feature. Selection should prioritize active product status and compliance certifications (ROHS3, REACH Unaffected, EAR99 ECCN classification).
Frequently Asked Questions (FAQ)
Q: Can PCF8574ATS/3,118 directly replace PCA8574ATS,118 without PCB modifications? A: Yes, PCF8574ATS/3,118 uses the same 20-LSSOP package and pinout. The primary functional difference is 100 kHz clock frequency versus 400 kHz. If your application operates at I2C standard mode (100 kHz) or lower, this substitution requires no design changes.
Q: What is the key difference between TCA9534 and TCA6408 I/O expanders? A: Both provide 8 I/O lines at 400 kHz with identical electrical characteristics. TCA6408 adds SMBus protocol compatibility and uses a 16-pin package versus TCA9534's 16-pin SOIC/TSSOP options. TCA6408 is available in more compact UQFN packaging.
Q: Why do MAX7324 parts require PCB redesign? A: MAX7324 variants use 24-pin packages (QSOP or TQFN) compared to the original 20-pin SSOP. The additional pins and different footprint necessitate PCB layout modifications. However, MAX7324 offers extended temperature range (-40°C to 125°C) and lower minimum supply voltage (1.71V).
Q: Are all substitute parts RoHS3 compliant? A: Yes, all listed substitute parts carry ROHS3 Compliant status and REACH Unaffected classification, matching the original PCA8574ATS,118 environmental compliance profile.
Q: Which substitute offers the best inventory availability? A: TCA9534PWR (Texas Instruments, 16-TSSOP) shows the highest inventory at 165,200 pieces. PCF8574APWR (Texas Instruments, 20-TSSOP) is also well-stocked at 38,350 pieces, making both suitable for high-volume production requirements.
Q: Can I use a substitute with lower clock frequency if my design requires 400 kHz operation? A: No. PCF8574 variants operate at 100 kHz maximum and cannot meet 400 kHz I2C bus speed requirements. For 400 kHz operation, select TCA9534, TCA6408, or MAX7324 families.
Q: What is the minimum supply voltage difference between substitutes? A: The original PCA8574ATS,118 operates from 2.3V minimum. PCF8574 variants require 2.5V minimum, while TCA9534, TCA6408, and MAX7324 operate from 1.65V to 1.71V minimum, providing greater flexibility for low-voltage applications.
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