PCF8574AP,112 Equivalent & Substitute Parts

Part Overview

The PCF8574AP,112 is an 8-bit I/O expander with I2C interface operating at 100 kHz, manufactured by NXP USA Inc. in a 16-DIP through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device provides push-pull output capability with 300µA source and 25mA sink current, operating across a 2.5V to 6V supply range and -40°C to 85°C temperature range.

Substiute Parts

PCF8574AP,112

NXP USA Inc.In Stock: 1061PCF8574AP,112 Datasheet

Current PartRFQ

PCF8574AT/3,518

NXP SemiconductorsIn Stock: 17634PCF8574AT/3,518 Datasheet

DirectRFQ

PCF8574AN

Texas InstrumentsIn Stock: 3941PCF8574AN Datasheet

DirectRFQ

MAX1609EEE+

Analog Devices Inc./Maxim IntegratedIn Stock: 796MAX1609EEE+ Datasheet

MFR RecommendedRFQ

MAX7329AWE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1206MAX7329AWE+ Datasheet

MFR RecommendedRFQ

MAX7329AWE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1106MAX7329AWE+T Datasheet

MFR RecommendedRFQ

NLVPCA9535EDTR2G

onsemiIn Stock: 5716NLVPCA9535EDTR2G Datasheet

MFR RecommendedRFQ

PCF8574N

Texas InstrumentsIn Stock: 2056PCF8574N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCF8574AP,112 is determined by the following critical parameters: 8 I/O count, I2C interface at 100 kHz, interrupt output capability, push-pull output type, 300µA/25mA current rating, 2.5V–6V supply voltage, and -40°C to 85°C operating temperature range.

Substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Through-Hole Replacements Parts maintaining identical package (16-DIP), I/O count (8), interface (I2C), and electrical specifications. These include PCF8574N and PCF8574AN, both active products from Texas Instruments with equivalent functional performance.

Category 2: Surface-Mount Equivalents with Matching Electrical Specifications Parts with identical electrical parameters but different mounting technology (surface mount) and packaging. These include PCF8574AT/3,518 (16-SOIC), MAX7329AWE+ and MAX7329AWE+T (16-SOIC), and NLVPCA9535EDTR2G (24-TSSOP with 16 I/O).

Category 3: Functional Alternatives with Interface Variation MAX1609EEE+ operates on SMBus instead of I2C, with open-drain output and reduced supply voltage range (2.7V–5.5V), requiring circuit topology evaluation before substitution.

Parameter Comparison

Engineering Selection Recommendations

For Direct Through-Hole Replacement (Recommended Primary Option) PCF8574N and PCF8574AN are active products from Texas Instruments with identical package (16-DIP), I/O count (8), I2C interface, and operating specifications. Both maintain ROHS3 compliance and equivalent functional performance. PCF8574N is available in higher quantity (2000 pcs) compared to PCF8574AN (3900 pcs). Source current specification differs (1mA vs. 300µA), but sink current remains 25mA, suitable for most applications.

For Surface-Mount Designs PCF8574AT/3,518 from NXP Semiconductors provides the closest electrical match in surface-mount form factor (16-SOIC), maintaining identical current specifications (300µA source, 25mA sink) and push-pull output type. This part is active with 17,623 pcs in stock.

MAX7329AWE+ and MAX7329AWE+T offer extended operating temperature range (-40°C to 125°C) and higher inventory availability (1,162 and 1,021 pcs respectively). Output type differs (open drain vs. push-pull), requiring pull-up resistor configuration in the application circuit. Supply voltage range is slightly reduced (2.5V–5.5V vs. 2.5V–6V).

For I/O Expansion Beyond 8 Bits NLVPCA9535EDTR2G provides 16 I/O lines with I2C interface at 100 kHz, though it is classified as obsolete. This part is suitable only when additional I/O capacity is required and circuit redesign is acceptable.

Not Recommended for Direct Substitution MAX1609EEE+ operates on SMBus protocol instead of I2C, lacks interrupt output, and features open-drain output. Substitution requires protocol verification and circuit topology changes.

Frequently Asked Questions (FAQ)

Q: Can PCF8574N or PCF8574AN directly replace PCF8574AP,112 in existing designs? A: Yes. Both parts maintain identical 16-DIP package, 8 I/O count, I2C 100 kHz interface, interrupt output, and operating temperature range (-40°C to 85°C). The source current specification differs (1mA vs. 300µA), but sink current remains 25mA. Verify application current requirements before substitution.

Q: What is the difference between push-pull and open-drain output types? A: Push-pull output (PCF8574 series) actively drives both high and low logic states. Open-drain output (MAX7329, NLVPCA9535) requires external pull-up resistors to achieve high logic state. Circuit topology must accommodate this difference.

Q: Can I use a surface-mount part (PCF8574AT/3,518) as a replacement for through-hole PCF8574AP,112? A: Electrically, yes. PCF8574AT/3,518 maintains identical specifications. However, this requires PCB redesign to accommodate 16-SOIC surface-mount package instead of 16-DIP through-hole. Use only if board redesign is feasible.

Q: Is NLVPCA9535EDTR2G a suitable substitute? A: NLVPCA9535EDTR2G provides 16 I/O lines (vs. 8 on PCF8574AP,112) with I2C interface. It is classified as obsolete and features open-drain output. Substitution is viable only when additional I/O capacity is required and circuit redesign is acceptable.

Q: What are the compliance and certification differences? A: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original PCF8574AP,112. Moisture sensitivity levels vary: PCF8574 series (MSL 1 or Not Applicable), MAX7329 series (MSL 1), NLVPCA9535EDTR2G (MSL 1), MAX1609EEE+ (MSL 1).

Q: Why is MAX1609EEE+ listed if it is not recommended? A: MAX1609EEE+ is included for completeness as a functional alternative. It operates on SMBus (not I2C), lacks interrupt output, and features open-drain output. Direct substitution is not recommended without protocol and circuit verification.