{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MCP3221A4T-E/OT","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"MCP3221A4T-E-OT","canonicalUrl":"https://icboms.com/microchip/MCP3221A4T-E-OT","factsUrl":"https://icboms.com/api/mcp/products/MCP3221A4T-E%2FOT","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology MCP3221A4T-E/OT 12-bit SAR ADC, 22.3 kS/s, I²C, Single Ended, SOT-23-5, -40°C to +125°C.","salesMarkdown":"## 12-bit SAR ADC in a SOT-23-5 — fit for space-constrained single-channel conversion The MCP3221A4T-E/OT is a 12-bit successive-approximation-register (SAR) ADC from Microchip, sampling at 22.3 kS/s with a single-ended input and an I²C interface. It operates from a single 2.7V to 5.5V supply — the analog and digital rails share the same pin, so no separate reference or dual-supply routing is needed on the board. The 12-bit resolution gives 4096 codes across the supply voltage range, so the LSB size scales with VDD — at 5V it is 1.22 mV, at 3.3V it is 0.81 mV. This is a workhorse ADC for reading a single sensor or voltage rail where 0.1% accuracy is enough and the 22.3 kS/s throughput covers slow-changing signals like temperature, pressure, or battery voltage. ## Supply and temperature range — single-rail simplicity with 125°C headroom The -40°C to +125°C operating temperature covers automotive under-hood and industrial oven-adjacent environments; the 125°C ceiling gives margin above the 105°C typical for engine-bay electronics. The SOT-23-5 package (SC-74A) is a five-pin footprint that hand-solders easily and fits into tight mixed-signal layouts. The I²C interface uses only two bus lines (SCL, SDA) plus VDD and GND, leaving one pin for the analog input — the 1:1 S/H:ADC ratio means the sample-and-hold is dedicated to that single channel, so no input multiplexer settling delay.","metaTitle":"Microchip MCP3221A4T-E/OT 12-bit SAR ADC, SOT-23-5","metaDescription":"12-bit SAR ADC, 22.3 kS/s, I²C interface, 2.7V-5.5V supply, -40°C to +125°C, SOT-23-5. Active production, ROHS3 compliant. Sourced to order.","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)","Input Type":"Single Ended","Architecture":"SAR","Configuration":"S/H-ADC","Mounting Type":"Surface Mount","Data Interface":"I²C","Number of Bits":"12","Package / Case":"SC-74A, SOT-753","Reference Type":"Supply","Ratio - S/H:ADC":"1:1","lifecycle_stage":"eol_hot","Number of Inputs":"1","Operating Temperature":"-40°C ~ 125°C","Supplier Device Package":"SOT-23-5","Number of A/D Converters":"1","Voltage - Supply, Analog":"2.7V ~ 5.5V","Voltage - Supply, Digital":"2.7V ~ 5.5V","Sampling Rate (Per Second)":"22.3k"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.93","priceTiers":[{"qty":1,"price":"$1.93000","currency":"USD"},{"qty":25,"price":"$1.60080","currency":"USD"},{"qty":100,"price":"$1.48500","currency":"USD"},{"qty":3000,"price":"$1.48500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4678317b4c547a43b3da8e690afa9d5d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MCP3221A4T-E%2FOT/alternatives.json"},"ai":{"faq":[{"question":"Will MCP3221A4T-E/OT drop into a board designed for MCP3564T-E/NC?","answer":"No — the MCP3564 is a 24-bit sigma-delta ADC with differential inputs, an SPI interface, and a different package (20-QFN). The MCP3221 is a 12-bit SAR with a single-ended input and I²C bus. They are not pin-compatible or functionally interchangeable without a board and firmware redesign."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/MCP3221A4T-E-OT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/MCP3221A4T-E-OT 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}}