Alternatives to NXP PCF8574AT/3_518
NXP PCF8574AT/3_518 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 PCF8574AT/3_518NXP |  PCF8574ADWRTexas Instruments | PCF8574ADWTexas Instruments | +2more | |
|---|---|---|---|---|
| FFF Compatibility | The SOIC-16 (DW) package has the identical 7.50mm body width and pin assignment as the original NXP SO16 (SOT162-1) package.Matches mounting style (SMD), pin pitch (1.27mm), and body dimensions of the original device.Fully compatible 8-bit quasi-bidirectional I/O expander operating across the same 2.5V to 6V supply range and 100 kHz I2C clock frequency. | Package style (SOIC-16 wide) and pin assignments are fully identical.Exact package dimensions and surface-mount footprint compatibility.Equivalent electrical parameters, timing, and control logic to the target part. | ||
 AI Summary | PCF8574AT/3_518 by NXP: I/O Expander 8 I2C 100 kHz 16-SO. | This is the most reliable direct drop-in replacement. It belongs to the same I2C address group ('A' suffix) and package size, ensuring full software and hardware compatibility with the obsolete NXP part.
| This is the tube-packaged sibling of the PCF8574ADWR. It is an exact physical and functional equivalent to the queried part, though packaged in tubes rather than tape and reel.
| |
| Lifecycle Status | Obsolete | Active | Obsolete | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | I/O Expander 8 I2C 100 kHz 16-SO | I/O Expander 8 I2C 100 kHz 16-SOIC | I/O Expander 8 I2C 100 kHz 16-SOIC | |
| Manufacturer | NXP | Texas Instruments | Texas Instruments | |
| Type | Interface | Interface | Interface | |
| Datasheet | Open | Open | Open | |
| Lead Time | 99 weeks | 16 weeks | 6 weeks | |
| Country of Origin | TH | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0070 | - | - | |
| Moisture Sensitivity Level | 2 (1 Year) | - | - | |
| Features | POR | - | - | |
| Interface | I2C | - | - | |
| Output Type | Push-Pull | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Number of I/O | 8 | - | - | |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) | - | - | |
| Clock Frequency | 100 kHz | - | - | |
| Interrupt Output | Yes | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 PCF8574ATNXP | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 PCF8523T/1,118NXP | In stock | Obsolete | 6Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The NXP PCF8574AT/3_518 is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the NXP PCF8574AT/3_518 are the PCF8574ADWR (Texas Instruments) and the PCF8574ADW (Texas Instruments), out of 4 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the PCF8574AT/3_518 are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The PCF8574AT/3_518 (NXP) is a part in the Interface category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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