{"id":8046,"date":"2026-06-28T08:48:11","date_gmt":"2026-06-28T08:48:11","guid":{"rendered":"https:\/\/materialparts.com\/max811meust\/"},"modified":"2026-06-28T11:35:27","modified_gmt":"2026-06-28T11:35:27","slug":"max811meust","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/max811meust\/","title":{"rendered":"MAX811MEUS+T"},"content":{"rendered":"<h2>MAX811MEUS+T Overview<\/h2>\n<p>The MAX811MEUS+T is a 4-pin microprocessor reset supervisor from Analog Devices\/Maxim with 4.38V reset threshold, manual reset input, only 5uA supply current, in a SOT-143 package, suitable for MCU power-on reset and voltage monitoring.<\/p>\n<h3>Key Features<\/h3>\n<ul>\n<li>Reset threshold: 4.38V<\/li>\n<li>Reset output: Active low<\/li>\n<li>Manual reset input<\/li>\n<li>Supply current: 5uA<\/li>\n<li>Reset timeout: 140ms (minimum)<\/li>\n<li>Supply voltage: 1.2V-5.5V<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>MAX811MEUS+T Overview The MAX811MEUS+T is a 4-pin microprocessor reset supervisor from Analog Devices\/Maxim with 4.38V reset threshold, manual reset input, only 5uA supply current, in a SOT-143 package, suitable for MCU power-on reset and voltage monitoring. Key Features Reset threshold: 4.38V Reset output: Active low Manual reset input Supply current: 5uA Reset timeout: 140ms (minimum) [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[144],"class_list":["post-8046","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-on"],"acf":{"brief_explanation":"Microprocessor supervisor, 4.38V threshold, manual reset, SOT-23-5","date_code":"","package_case":"SOT-23-5 (2.90 x 1.60 x 1.10 mm)","in_stock":8005,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/MAX811-MAX812.pdf","price":"$0.72 @ 1ku","product_introduction":"The MAX811MEUS+T is a microprocessor supervisory circuit from Maxim Integrated (now Analog Devices), providing a precision reset output when the supply voltage drops below 4.38 V threshold. It features a manual reset input (MR), 140 ms minimum reset timeout, and an active-low reset output in a SOT-23-5 package. The device guarantees reset output valid to VCC = 1 V, ensuring proper system initialization during power-up and brownout conditions. With 2 uA supply current and no external components required, it is ideal for space-constrained embedded systems.","working_principle":"The MAX811MEUS+T continuously monitors the VCC supply voltage through an internal resistor divider and precision comparator. When VCC falls below the 4.38 V threshold (VIT-), the comparator triggers the reset generator, which drives the active-low RESET output low. The reset output remains low for a minimum of 140 ms after VCC rises above the threshold, allowing the microprocessor and power supply to stabilize before code execution begins. The manual reset (MR) input, when pulled low, triggers the same reset sequence regardless of VCC level. The MR input is debounced internally and includes an internal pull-up resistor. The open-drain reset output requires an external pull-up resistor when connected to active-high logic. The device is guaranteed to assert reset down to VCC = 1 V, ensuring reliable operation during deep brownout and power-down transients.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Description<\/th><\/tr><tr><td>1<\/td><td>MR<\/td><td>Manual reset input; active low, internal 50 kOhm pull-up, debounce filtered<\/td><\/tr><tr><td>2<\/td><td>GND<\/td><td>Ground reference<\/td><\/tr><tr><td>3<\/td><td>NC<\/td><td>No connect; leave floating<\/td><\/tr><tr><td>4<\/td><td>RESET<\/td><td>Active-low reset output; open-drain, requires external pull-up to VCC or logic rail<\/td><\/tr><tr><td>5<\/td><td>VCC<\/td><td>Supply voltage input; also serves as the monitored voltage (4.38 V threshold)<\/td><\/tr><\/table>\n<p>MAX811MEUS+T uses the 4-SOT-143 (US) surface-mount package with Pin 1 = GND, Pin 2 = RESET (active-low, push-pull output), Pin 3 = MR (Manual Reset input, active-low), Pin 4 = VCC. The \"M\" suffix denotes the 150ms reset timeout period. The RESET output is push-pull (not open-drain), eliminating the need for an external pull-up resistor. The MR pin has an internal 12k\u03a9 pull-up resistor \u2014 connecting MR to GND through a momentary switch triggers a manual reset. The SOT-143 package is slightly wider than SOT-23 to accommodate the four pins. For active-high reset output, use MAX812 (same pinout, RESET output is active-high). For different timeout periods, ME=140ms, LE=1.12s, TE=200ms suffixes are available.<\/p>","application_scenarios":"<ul><li><strong>Microprocessor Reset<\/strong>: Ensuring reliable startup and brownout detection for 5 V microcontrollers and FPGAs<\/li><li><strong>FPGA Configuration Control<\/strong>: Holding FPGA in reset during power supply ramp-up and transients<\/li><li><strong>Board-Level Monitoring<\/strong>: System-wide reset generation for multi-IC embedded boards<\/li><li><strong>Manual Reset Button<\/strong>: Debounced push-button reset for operator-controlled system restart<\/li><li><strong>Power Supply Supervision<\/strong>: Detecting 5 V rail undervoltage in telecom and industrial equipment<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Threshold<\/th><th>Timeout<\/th><th>Package<\/th><th>Notes<\/th><\/tr><tr><td>MAX811LEUS+T<\/td><td>ADI\/Maxim<\/td><td>4.63 V<\/td><td>140 ms<\/td><td>SOT-23-5<\/td><td>Higher threshold<\/td><\/tr><tr><td>MAX811TEUS+T<\/td><td>ADI\/Maxim<\/td><td>3.08 V<\/td><td>140 ms<\/td><td>SOT-23-5<\/td><td>3.3 V system threshold<\/td><\/tr><tr><td>DS1811<\/td><td>ADI\/Maxim<\/td><td>4.38 V<\/td><td>140 ms<\/td><td>SOT-23-5<\/td><td>Pin-compatible equivalent<\/td><\/tr><tr><td>TLC7733<\/td><td>Texas Instruments<\/td><td>3.08 V<\/td><td>200 ms<\/td><td>SOT-23-5<\/td><td>TI alternative, 3.3 V<\/td><\/tr><tr><td>ADM811MART-REEL7<\/td><td>Analog Devices<\/td><td>4.38 V<\/td><td>140 ms<\/td><td>SOT-23-5<\/td><td>ADI pin-compatible<\/td><\/tr><\/table>\n<p>MAX811MEUS+T is a 150ms reset supervisor from Maxim\/ADI in SOT-143-4. The MAX812 provides active-high RESET output in the same package. The MCP130T from Microchip offers similar 4.38V threshold in SOT-23-3 with open-drain output. The TPS3839 from TI provides nanopower 150nA supply current in SOT-23-3. The CAT811 from onsemi offers the same function with CMOS push-pull output in SOT-143. For adjustable threshold, TLV803 from TI provides factory-programmable thresholds from 0.9V to 5.0V.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8046","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=8046"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8046\/revisions"}],"predecessor-version":[{"id":8085,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8046\/revisions\/8085"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=8046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=8046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=8046"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=8046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}