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Alternative part analysis

PCA8574D,518 LTB replacements and cross reference

Compare mapped pin-to-pin replacement options for PCA8574D,518, review cross-reference notes, and verify the engineering fit before approval.

Compare PCA8574D,518 vs PCF8574DWR and review the mapped replacement relationship here.

Compare PCA8574D,518 against mapped replacement options
Review package, lifecycle, stock, and MOQ in one view
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Back to product detail pageBrowse NXP SemiconductorsSee Interface - I/O Expanders category

PCA8574D,518 cross reference and alternatives

PCA8574D,518 vs PCF8574DWR: replacement comparison

Start with the best mapped replacement options for PCA8574D,518, including pin-to-pin, functional, and cross-reference alternatives. Review the overview and core specifications, then submit an RFQ when the fit looks right.

P2P

PCA8574D,518 vs PCF8574DWR

Texas Instruments

Same-function SOIC-16 P2P review candidate for PCA8574D,518. Validate quasi-bidirectional I/O and firmware assumptions.

PCF8574DWR is mapped as a possible replacement for PCA8574D,518. Verify package, lifecycle, stock, datasheet, and key attributes before approval.

Manufacturer
Texas Instruments
Package
16-SOIC
Series
PCF8574
Category
Integrated Circuits (ICs)
Stock
30,000
Available
20,000
Min Order
1
Datasheet
Available
Key Attributes: -

Matches

  • Package: 16-SOIC
  • Category: Integrated Circuits (ICs)
  • Subcategory: Interface - I/O Expanders
  • Interface: I2C

Differences

  • Series: PCA8574 vs PCF8574
  • Clock Frequency: 400 kHz vs 100 kHz typical family class
  • Supply Voltage: 2.3 V to 5.5 V vs 2.5 V to 6 V
  • Manufacturer: NXP USA Inc. vs Texas Instruments

Must verify

  • Confirm the complete pinout; a mapped pin-to-pin relationship is not final approval.
  • Check electrical limits and test conditions in both manufacturer datasheets.
  • Confirm qualification, compliance, and internal approval requirements.

Other replacement comparisons for PCA8574D,518

Functional

PCA8574D,518 vs PCAL6408AEX1Z

NXP Semiconductors

NXP recommended functional replacement path with newer low-voltage translating GPIO features; layout and firmware review required.

PCAL6408AEX1Z is mapped as a possible replacement for PCA8574D,518. Verify package, lifecycle, stock, datasheet, and key attributes before approval.

Manufacturer
NXP Semiconductors
Package
16-X2QFN
Series
PCAL6408A
Category
Integrated Circuits (ICs)
Stock
30,000
Available
20,000
Min Order
1
Datasheet
Available
Key Attributes: -

Matches

  • Category: Integrated Circuits (ICs)
  • Subcategory: Interface - I/O Expanders
  • Number of I/O: 8
  • Clock Frequency: 400 kHz

Differences

  • Package: 16-SOIC vs 16-X2QFN
  • Series: PCA8574 vs PCAL6408A
  • Interface: I2C vs I2C / SMBus
  • Supply Voltage: 2.3 V to 5.5 V vs 1.65 V to 5.5 V

Must verify

  • Confirm package dimensions, footprint, and mounting details.
  • Confirm functional behavior and application-level compatibility.
  • Check electrical limits and test conditions in both manufacturer datasheets.
  • Confirm qualification, compliance, and internal approval requirements.

Specification view

Parameter Comparison Chart

A side-by-side view of the source part and its mapped alternatives so buyers and engineers can screen package, availability, lifecycle, and key descriptors before RFQ.

Swipe or scroll horizontally to compare more part numbers

The left column stays visible so buyers can keep the spec label in view while scanning multiple alternatives.

Parameter Comparison Chart
Current partLTB
PCA8574D,518

NXP Semiconductors

P2P
PCF8574DWR

Texas Instruments

Functional
PCAL6408AEX1Z

NXP Semiconductors

Part NumberPCA8574D,518PCF8574DWRPCAL6408AEX1Z
ManufacturerNXP SemiconductorsTexas InstrumentsNXP Semiconductors
CategoryIntegrated Circuits (ICs)Integrated Circuits (ICs)Integrated Circuits (ICs)
SubcategoryInterface - I/O ExpandersInterface - I/O ExpandersInterface - I/O Expanders
Package16-SOIC16-SOIC16-X2QFN
SeriesPCA8574PCF8574PCAL6408A
Key Attributes---
Description8-bit I2C-bus I/O expander in 16-SOIC, listed by NXP for 2026 last-time buy.8-bit I2C I/O expander in 16-SOIC used as a P2P candidate for PCA8574D,518.Active low-voltage translating 8-bit I2C/SMBus GPIO expander used as NXP functional replacement.
LifecycleLTB--
Stock20,00030,00030,000
Available12,00020,00020,000
Min Order111
DatasheetAvailableAvailableAvailable
InterfaceI2CI2CI2C / SMBus
Number of I/O888
Clock Frequency400 kHz100 kHz typical family class400 kHz
Supply Voltage2.3 V to 5.5 V2.5 V to 6 V1.65 V to 5.5 V
ManufacturerNXP USA Inc.Texas InstrumentsNXP USA Inc.
Lifecycle StatusEOL / Last Time Buy-Active
Package / Case16-SOIC16-SOIC16-X2QFN
Replacement PathPCF8574DWR P2P; PCAL6408AEX1Z functional--
Function8-bit I2C GPIO expander8-bit I2C GPIO expander8-bit low-voltage translating GPIO expander
Replacement Role-P2P review candidate-
Actions

Cross-reference FAQ

Replacement Part Questions

Short answers for teams reviewing PCA8574D,518 replacement and equivalent-part options.

What is a cross-reference page for PCA8574D,518?

This page groups mapped replacement options for PCA8574D,518 so buyers and engineers can compare alternatives before requesting a quote or approving a substitute.

Does a mapped alternative mean a guaranteed drop-in replacement for PCA8574D,518?

Not automatically. Cross-reference mapping helps shortlist candidates, but package, electrical behavior, qualification scope, and approval rules still need to be checked before release.

Which parameters should teams compare first for PCA8574D,518 alternatives?

Start with package, series, key attributes, lifecycle status, stock position, datasheet access, and the mapped pin-to-pin or cross-reference note. Then confirm application-specific requirements in the datasheet and RFQ stage.

Can I request a quote for an alternative to PCA8574D,518?

Yes. Use the product links or RFQ actions on this page to request pricing, availability, documentation, and sourcing support for any listed alternative part.

Is PCA8574D,518 obsolete, and what replacement should buyers review first?

Check the lifecycle row on this page first. If buyers need a fast starting point, the strongest mapped replacement currently surfaced here is PCF8574DWR, followed by the other alternatives shown in the comparison table.

Is PCF8574DWR a replacement for PCA8574D,518?

PCF8574DWR is mapped as a P2P option for PCA8574D,518, not as an automatically approved drop-in replacement. Compare package, pinout, electrical limits, lifecycle, and qualification requirements before release.

Engineering support

Need help validating the replacement path?

If your team is unsure whether a mapped alternative to PCA8574D,518 from NXP Semiconductors is really usable, contact us for help on package fit, pin compatibility, key parameter gaps, and qualification-facing review questions.

Contact a hardware engineer

Email our engineering support contact at [email protected], or use the contact page if the question should be routed across sourcing, engineering, and support.

Package and pin compatibility

Review whether the alternate path looks credible from package, footprint, and pin-level perspectives.

Parameter and function gaps

Surface the electrical, interface, or application-fit questions that still need confirmation before approval.

Qualification and approval prep

Organize the documentation, datasheet evidence, and validation checkpoints your internal team may still require.