{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCA9534ADB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCA9534ADB","canonicalUrl":"https://icboms.com/texas-instruments/PCA9534ADB","factsUrl":"https://icboms.com/api/mcp/products/PCA9534ADB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCA9534A series I²C/SMBus I/O expander, 8-bit, 16-SSOP (0.209\", 5.30mm Width), Tube, 2.3V~5.5V supply, -40°C~85°C, push-pull outputs, POR, interrupt output.","salesMarkdown":"## 8 GPIOs on the I²C bus The PCA9534ADB is an 8-bit I²C-bus and SMBus I/O expander from Texas Instruments. It adds eight general-purpose I/O pins to a system through a two-wire serial interface, freeing up processor GPIOs for other tasks. ## Supply, temperature, and drive Each I/O pin can source 10 mA or sink 25 mA — enough to drive an LED directly or switch a small-signal relay through a transistor. The push-pull output structure eliminates the need for external pull-up resistors on output pins. An open-drain interrupt output (INT) asserts when an input changes state, letting the host processor poll the expander only on demand rather than continuously. This reduces I²C bus traffic and saves CPU cycles in power-sensitive designs. ## Package and board-fit The supplier device package is 16-SSOP, and the device is shipped in a Tube. The 1.27 mm pin pitch of the SSOP package is layout-friendly for two-layer boards. Standard decoupling — a 0.1 µF ceramic near the VCC pin — is sufficient; the POR circuit handles the reset timing.","metaTitle":"TI PCA9534ADB I²C I/O Expander, 8-bit, 16-SSOP","metaDescription":"Texas Instruments PCA9534ADB I²C/SMBus I/O expander, 8 GPIO, 400 kHz, 2.3-5.5 V, -40 to 85°C, 16-SSOP. Active, ROHS3. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Package":"Tube","Features":"POR","Interface":"I²C, SMBus","Output Type":"Push-Pull","Mounting Type":"Surface Mount","Number of I/O":"8","Package / Case":"16-SSOP (0.209\\\", 5.30mm Width)","Clock Frequency":"400 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"Yes","Voltage - Supply":"2.3V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"16-SSOP","Current - Output Source/Sink":"10mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.51","priceTiers":[{"qty":1,"price":"$2.51000","currency":"USD"},{"qty":10,"price":"$2.25300","currency":"USD"},{"qty":25,"price":"$2.12520","currency":"USD"},{"qty":100,"price":"$1.81080","currency":"USD"},{"qty":250,"price":"$1.70024","currency":"USD"},{"qty":500,"price":"$1.48772","currency":"USD"},{"qty":1000,"price":"$1.23267","currency":"USD"},{"qty":2500,"price":"$1.20300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0eb2a599f8938193efde1bd70240c816.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCA9534ADB/alternatives.json"},"ai":{"faq":[{"question":"What is the PCA9534ADB used for?","answer":"The PCA9534ADB is an 8-bit I²C/SMBus I/O expander. It adds eight GPIO pins to a microcontroller or processor over a two-wire serial bus, commonly used in embedded systems to monitor switches, drive LEDs, or control relays without consuming processor pins."},{"question":"What is the closest pin-compatible alternative to the PCA9534ADB?","answer":"The PCA9534ADB is the 16-SSOP variant of the PCA9534A family. The PCA9534ADW (SOIC-16) and PCA9534APW (TSSOP-16) are functionally identical but differ in package. For a direct drop-in replacement in the same 16-SSOP footprint, the PCA9534ADB is the specific order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCA9534ADB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCA9534ADB when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}