{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCA9557D,118","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"PCA9557D118","canonicalUrl":"https://icboms.com/nxp/PCA9557D118","factsUrl":"https://icboms.com/api/mcp/products/PCA9557D%2C118","rawCanonicalId":null},"summary":{"shortDescription":"NXP PCA9557D,118 I2C/SMBus I/O expander, 8-bit, 400 kHz, 2.3-5.5V, open drain/push-pull, 16-SOIC, Tape & Reel.","salesMarkdown":"## 8-bit I/O expander for I2C and SMBus buses The NXP PCA9557D,118 is an 8-bit I/O expander that communicates over I2C or SMBus at up to 400 kHz. It provides eight general-purpose I/O pins configurable as inputs or outputs, with open-drain or push-pull output drive. Each I/O can source 10 mA or sink 25 mA, enough to drive LEDs or small relays directly without a buffer transistor. A Power-On Reset (POR) circuit ensures the outputs start in a known high-impedance state, preventing glitches during power-up. ## Supply voltage and I/O drive capability Operating from 2.3 V to 5.5 V, the PCA9557D,118 covers the standard digital supply rails for microcontrollers and FPGAs. The 400 kHz I2C clock rate is compatible with most bus masters and allows daisy-chaining multiple expanders on the same two-wire bus. With 10 mA source and 25 mA sink per pin, the expander can drive indicator LEDs with a series resistor or switch small relays through a transistor. The open-drain output option allows wired-AND connections for shared interrupt lines. ## Package and board-fit details Housed in a 16-SOIC package with a 3.90 mm body width and 1.27 mm pin pitch, the PCA9557D,118 uses a standard SOIC-16 footprint. The surface-mount package is suitable for both reflow and hand-soldering in rework scenarios. The supplier device package is designated 16-SO, matching the common NXP SOIC-16 land pattern.","metaTitle":"NXP PCA9557D,118 I2C I/O Expander, 8-bit, 16-SOIC","metaDescription":"NXP PCA9557D,118 8-bit I2C/SMBus I/O expander. 2.3-5.5V supply, 400 kHz clock, 16-SOIC package. Active production, ROHS3. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"POR","Interface":"I²C, SMBus","Output Type":"Open Drain, Push-Pull","Mounting Type":"Surface Mount","Number of I/O":"8","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","Clock Frequency":"400 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"No","Voltage - Supply":"2.3V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"16-SO","Current - Output Source/Sink":"10mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.71","stockQuantity":16,"priceTiers":[{"qty":1,"price":"$1.71000","currency":"USD"},{"qty":10,"price":"$1.53900","currency":"USD"},{"qty":25,"price":"$1.45160","currency":"USD"},{"qty":100,"price":"$1.23680","currency":"USD"},{"qty":250,"price":"$1.16128","currency":"USD"},{"qty":500,"price":"$1.01614","currency":"USD"},{"qty":1000,"price":"$0.84194","currency":"USD"},{"qty":2500,"price":"$0.78388","currency":"USD"},{"qty":5000,"price":"$0.75484","currency":"USD"},{"qty":12500,"price":"$0.72581","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d90cc7250191e87077d31059e93e9bca.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does PCA9557D support interrupt output?","answer":"No, the PCA9557D does not have an interrupt output pin. For interrupt support, consider the PCA9557PW variant or a part with an INT pin."},{"question":"What is the difference between PCA9557D and PCA9557PW?","answer":"The PCA9557D comes in a 16-SOIC package, while the PCA9557PW uses a 16-TSSOP package. The TSSOP variant is smaller and better for space-constrained designs, but the SOIC is easier to hand-solder and rework. Functionally they are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/PCA9557D118","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/PCA9557D118 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}