{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX6421US26+T","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX6421US26T","canonicalUrl":"https://icboms.com/analog-devices/MAX6421US26T","factsUrl":"https://icboms.com/api/mcp/products/MAX6421US26%2BT","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices MAX6421US26+T, Simple Reset/Power-On Reset, Active Low, Push-Pull, 2.625V Threshold, Adjustable Timeout, -40°C to 125°C, SOT-143-4, Tape & Reel.","salesMarkdown":"## 2.625V threshold — the rail it watches The MAX6421US26+T is a single-channel voltage supervisor from Analog Devices, built for the simple reset/power-on reset job. Its 2.625V threshold sits right at the edge of a 2.5V rail's undervoltage limit or a 3.3V rail's brownout zone — you pick the capacitor to set the reset timeout. The active-low, push-pull output means no external pull-up resistor, which saves a component and a trace on a tight board. Rated across -40°C to 125°C, this part handles automotive under-hood or industrial motor-drive environments without a second temperature-grade variant. ## Adjustable timeout — one cap sets the delay Unlike fixed-timeout supervisors that lock you into a 100 ms or 200 ms window, the MAX6421US26+T lets you choose the reset release delay with a single external capacitor. That matters when your microcontroller needs extra time for the oscillator to stabilize or an external regulator to ramp. The trade-off: one more BOM line and a small PCB footprint for the cap. If your design already uses a fixed-timeout part and you want to standardize, the MAX6420US26+T is the fixed-delay sibling worth comparing. ## Active lifecycle — no LTB surprise Listed as Active with ROHS3 compliance, the MAX6421US26+T is not on any end-of-life watch. That means you can qualify it into a new production BOM without worrying about a last-time-buy window closing mid-program. ## SOT-143-4 — small, surface-mount, field-swappable The SOT-143-4 package (also listed as TO-253-4) is a common four-pin footprint for voltage supervisors. It is small enough for space-constrained designs but large enough to hand-solder with a fine tip if you are doing rework or field repair. No exposed pad, no thermal vias — just four pads and a clear orientation mark. If you are swapping this on site with a basic iron, the active-low output and push-pull stage mean you do not need to check for a missing pull-up resistor on the replacement board.","metaTitle":"MAX6421US26+T Simple Reset/Power-On Reset, 2.625V Threshold","metaDescription":"MAX6421US26+T is an active simple reset/power-on reset IC from Analog Devices. Active-low push-pull output, 2.625V threshold, -40°C to 125°C range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Simple Reset/Power-On Reset","Reset":"Active Low","Output":"Push-Pull, Totem Pole","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Reset Timeout":"Adjustable/Selectable","Package / Case":"TO-253-4, TO-253AA","lifecycle_stage":"eol_hot","Voltage - Threshold":"2.625V","Operating Temperature":"-40°C ~ 125°C (TA)","Supplier Device Package":"SOT-143-4","Number of Voltages Monitored":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.15","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$4.15000","currency":"USD"},{"qty":10,"price":"$3.72500","currency":"USD"},{"qty":25,"price":"$3.52200","currency":"USD"},{"qty":100,"price":"$3.05240","currency":"USD"},{"qty":250,"price":"$2.89584","currency":"USD"},{"qty":500,"price":"$2.59844","currency":"USD"},{"qty":1000,"price":"$2.19146","currency":"USD"},{"qty":2500,"price":"$1.86719","currency":"USD"},{"qty":5000,"price":"$1.79699","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/933cc1c646d91ed9ac5841be1ed1930d.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to MAX6421US26+T?","answer":"The MAX6420US26+T is the fixed-reset-timeout sibling in the same family. Both share the same SOT-143-4 footprint, 2.625V threshold, and active-low push-pull output. The difference is the timeout: the MAX6421US26+T uses an external capacitor for an adjustable delay, while the MAX6420US26+T has a fixed internal timeout. If your design already has a timing capacitor on the layout, the MAX6421US26+T is the right fit; if you want to eliminate that cap, the MAX6420US26+T is the alternative."},{"question":"What is MAX6421US26+T's listed reset type?","answer":"It is a Simple Reset/Power-On Reset with an active-low output. The output stage is push-pull (totem pole), so it drives the reset line high or low without needing an external pull-up resistor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX6421US26T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX6421US26T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}