ProductsIntegrated CircuitsPCF8574T/3,518
PACKAGE REFERENCESO-16Confirm case, pinout and ordering suffix before purchase.
MANUFACTURER PART RECORD

PCF8574T/3,518

NXP Semiconductors

PCF8574T/3,518 is an NXP Semiconductors PCF8574T 8-bit I2C-bus I/O expander in SO-16, 1000-piece tape and reel — 2.5 V to 6 V supply, 100 kHz I2C, 8 quasi-bidirectional I/O pins with latched outputs driving LEDs directly, open-drain interrupt output, 3 hardware address pins for up to 8 devices on one bus, −40 °C to +85 °C. Selection advice: the interrupt-on-change output is the design win — the MCU sleeps until a pin actually changes instead of polling the expander over I2C. Lifecycle warning: DigiKey and Future Electronics both list PCF8574T/3,518 as Obsolete at NXP — for new designs, migrate to the PCF8574AT or a current-production I2C expander (mind the address range: PCF8574 uses 0x20–0x27, PCF8574A uses 0x38–0x3F, they are not drop-in address-compatible); for repairs and legacy builds, we source remaining distributor and factory stock. Evidence: DigiKey and Future Electronics confirm the /3,518 code, SO-16, 1000-piece reel and Obsolete status. Match the full PCF8574T/3,518 code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

Integrated CircuitsI2C GPIO expanderSO-16
MPN
PCF8574T/3,518
Manufacturer
NXP Semiconductors
Family
I2C GPIO expander
Package
SO-16
Manufacturer channel coverage
Checked by RFQ
Data last checked
Commercial check required
PROCUREMENT DATA

Identity and sourcing requirements.

Manufacturer part number
PCF8574T/3,518
Manufacturer
NXP Semiconductors
Product family
I2C GPIO expander
Category
Integrated Circuits
Package reference
SO-16
Manufacturer-channel report
Confirmed on request
Sourceics price status
Quoted for required quantity
Sourceics sourcing status
Supplier and stock verified during RFQ
Required order checks
Suffix, package, date code, lot, source and traceability
SELECTION GUIDANCE

PCF8574T/3,518 selection guidance

PCF8574T/3,518 is a I2C GPIO expander from NXP Semiconductors, orderable in the SO-16 package. The ordering code fixes the exact configuration you receive — package, grade and packing — so procurement starts with matching this code character-for-character against your BOM, not just the base series name.

When you request a quote, include the full ordering code, the target packing format (reel, tube, tray or cut tape), your quantity and any date-code or lot requirements. We reconfirm manufacturer, suffix, package, date code and traceability against the actual offered lot before any commercial quote is issued, and every RFQ gets a reply within 24 hours.

QUOTE WORKFLOW

Four checks before a commercial offer.

01

Identity

Exact MPN, manufacturer and suffix

02

Supply

Supplier type, quantity and freshness

03

Evidence

Lot, labels, photos and documents

04

Terms

Price, lead time, payment and shipping

RELATED REFERENCES

Explore more Integrated Circuits records

Browse existing catalog records — same series first, then the same category and manufacturer. These are not confirmed replacements; compatibility requires engineering review.

COMMON QUESTIONS

PCF8574T/3,518 FAQ

What do the suffixes in PCF8574T/3,518 mean?

Every suffix in a manufacturer ordering code identifies one exact orderable device — package, temperature grade, packing format or a revision. PCF8574T/3,518 names the SO-16 configuration; a code that differs by even one suffix character may be a different device. Always quote the complete code exactly as it appears on your BOM.

What is the difference between package and packing for PCF8574T/3,518?

The package (SO-16) is the physical form of the device itself. Packing describes how the devices are delivered — reel, tube, tray or cut tape. The same ordering code can ship in different packing formats depending on the lot, so confirm the required packing format when you submit your RFQ.

Can you provide traceability documents for PCF8574T/3,518?

Traceability evidence — lot and date-code information, labels and photos — is confirmed per lot at quotation time, because it depends on the actual lot offered. Tell us which documents your receiving inspection requires when you submit the RFQ, and we will confirm what can be provided for the offered lot.

How do I request a quotation for PCF8574T/3,518?

Add PCF8574T/3,518 to your RFQ with the complete ordering code, the manufacturer (NXP Semiconductors), your quantity, the target packing format and any date-code requirements. We reply to every RFQ within 24 hours.