{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MCP121T-195I/TT","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"MCP121T-195I-TT","canonicalUrl":"https://icboms.com/microchip/MCP121T-195I-TT","factsUrl":"https://icboms.com/api/mcp/products/MCP121T-195I%2FTT","rawCanonicalId":null},"summary":{"shortDescription":"Microchip MCP121T-195I/TT Simple Reset/Power-On Reset, active-low open-drain output, 1.9V threshold, 80ms minimum reset timeout, SOT-23-3 package, -40°C to 85°C operating temperature.","salesMarkdown":"## 1.9V threshold supervisor in a SOT-23-3 The Microchip MCP121T-195I/TT is a simple reset/power-on reset supervisor that monitors a single voltage rail and asserts a reset signal when the supply drops below 1.9V. The output is active-low open-drain, so it can be wire-ORed with other reset sources or pulled up to any voltage up to the absolute maximum of the open-drain transistor. ## Active-low open-drain output — wired-OR compatible Because the output is open-drain and active-low, this part can share a common reset line with other supervisors, a manual reset button, or a watchdog timer without contention. The pull-up resistor value sets the rise time; for a SOT-23-3 layout with short traces, a 10 kΩ pull-up to the MCU supply is typical. The 1.9V threshold is a good fit for monitoring a 1.8V or 2.5V core rail — it asserts before the logic becomes indeterminate. ## Industrial temperature range and active lifecycle The SOT-23-3 package is a standard footprint — easy to hand-solder or reflow, and the small body keeps board area to a minimum.","metaTitle":"MCP121T-195I/TT Simple Reset/Power-On Reset, 1.9V Threshold","metaDescription":"Microchip MCP121T-195I/TT supervisor IC: active-low open-drain output, 1.9V threshold, 80ms min reset timeout, SOT-23-3, -40°C to 85°C. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"Simple Reset/Power-On Reset","Reset":"Active Low","Output":"Open Drain or Open Collector","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Reset Timeout":"80ms Minimum","Package / Case":"TO-236-3, SC-59, SOT-23-3","lifecycle_stage":"eol_hot","Voltage - Threshold":"1.9V","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"SOT-23-3","Number of Voltages Monitored":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.72","priceTiers":[{"qty":1,"price":"$0.72000","currency":"USD"},{"qty":25,"price":"$0.60400","currency":"USD"},{"qty":100,"price":"$0.54060","currency":"USD"},{"qty":3000,"price":"$0.54060","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/16be20d135db34434d936296911bcc87.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MCP121T-195I%2FTT/alternatives.json"},"ai":{"faq":[{"question":"Is MCP121T-195I/TT active low or active high?","answer":"It is active-low — the reset output goes low when the supply drops below the threshold and stays low for the 80ms minimum timeout after the supply recovers."},{"question":"Does MCP121T-195I/TT have an open drain output?","answer":"Yes, the output is open-drain (open collector), which allows the reset line to be shared with other open-drain outputs or pulled up to a different voltage than the supervisor supply."},{"question":"What is the reset timeout of MCP121T-195I/TT?","answer":"The reset timeout is a minimum of 80ms. This ensures the supply rail has settled before the processor is released from reset."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/MCP121T-195I-TT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/MCP121T-195I-TT 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}}