{"id":9754,"date":"2026-07-05T12:44:17","date_gmt":"2026-07-05T12:44:17","guid":{"rendered":"https:\/\/materialparts.com\/um803rs\/"},"modified":"2026-07-05T12:44:17","modified_gmt":"2026-07-05T12:44:17","slug":"um803rs","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/um803rs\/","title":{"rendered":"UM803RS"},"content":{"rendered":"<h2>Productos<\/h2>\n<p>The UM803RS from Union Semiconductor is a 3-pin microprocessor reset circuit that monitors power supply voltage and asserts an active-low open-drain reset output when VCC drops below 2.63V. It provides a minimum 140ms reset timeout after VCC recovers and draws only 2uA typical supply current.<\/p>\n<h2>Especificaciones<\/h2>\n<ul>\n<li>Type: Microprocessor Reset Circuit<\/li>\n<li>Manufacturer: Union Semiconductor<\/li>\n<li>Reset Threshold: 2.63V typical (2.59V min \/ 2.66V max)<\/li>\n<li>Output: Open-drain, active-low RESET<\/li>\n<li>Reset Timeout: 140ms minimum (240ms typical)<\/li>\n<li>Supply Voltage: 1V to 5.5V<\/li>\n<li>Supply Current: 2uA typical<\/li>\n<li>Power Dissipation: 320mW max<\/li>\n<li>Package: SOT-23-3<\/li>\n<li>Operating Temp: -40C to +85C<\/li>\n<li>RoHS: Compliant<\/li>\n<\/ul>\n<h2>Caracter\u00edsticas<\/h2>\n<ul>\n<li>No external components required<\/li>\n<li>Ultra-low 2uA supply current<\/li>\n<li>Guaranteed reset valid down to VCC=1V<\/li>\n<li>Precision 2.63V threshold<\/li>\n<li>140ms minimum power-on reset pulse width<\/li>\n<li>Open-drain output can be pulled up above VCC<\/li>\n<\/ul>\n<h2>Aplicaciones<\/h2>\n<ul>\n<li>Microcontroller power-on\/brownout reset<\/li>\n<li>Portable and battery-powered equipment<\/li>\n<li>Intelligent instruments and controllers<\/li>\n<li>Critical uP\/uC power monitoring<\/li>\n<li>Automotive electronics supervision<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Product Overview The UM803RS from Union Semiconductor is a 3-pin microprocessor reset circuit that monitors power supply voltage and asserts an active-low open-drain reset output when VCC drops below 2.63V. It provides a minimum 140ms reset timeout after VCC recovers and draws only 2uA typical supply current. Key Specifications Type: Microprocessor Reset Circuit Manufacturer: Union [&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":[1025],"chip_brand":[1024],"class_list":["post-9754","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","tag-um803rs","chip_brand-union-semiconductor"],"acf":{"brief_explanation":"3-pin uP reset circuit, 2.63V threshold, open-drain, 140ms timeout, 2uA, SOT-23-3, -40~85C","date_code":"","package_case":"SOT-23-3 (TO-236-3 \/ SC-59)","in_stock":11624,"datasheet":"https:\/\/www.union-ic.com\/index.php?m=content&c=index&a=show&catid=30&id=108","price":"$0.10 @ 1ku","product_introduction":"The UM803RS from Union Semiconductor is a 3-pin microprocessor reset circuit with 2.63V threshold, open-drain active-low output, 140ms minimum reset timeout, and 2uA supply current in a SOT-23-3 package.","working_principle":"The UM803RS continuously monitors VCC through an internal resistor divider and precision comparator. When VCC falls below 2.63V, the comparator triggers RESET active-low. When VCC recovers, an internal timer keeps RESET asserted for at least 140ms before releasing it.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Function<\/th><\/tr><tr><td>1<\/td><td>RESET<\/td><td>Active-low reset output (open-drain)<\/td><\/tr><tr><td>2<\/td><td>GND<\/td><td>Ground<\/td><\/tr><tr><td>3<\/td><td>VCC<\/td><td>Power supply (1V-5.5V)<\/td><\/tr><\/table>","application_scenarios":"<ul><li>Microcontroller power-on\/brownout reset<\/li><li>Portable and battery-powered equipment<\/li><li>Intelligent instruments and controllers<\/li><li>Automotive electronics supervision<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Spec1<\/th><th>Spec2<\/th><\/tr><tr><td>TPS3839K33DBVR<\/td><td>TI<\/td><td>2.63V open-drain<\/td><td>SOT-23-3<\/td><\/tr><tr><td>MAX803TUR-T<\/td><td>Maxim<\/td><td>2.63V push-pull<\/td><td>SOT-23-3<\/td><\/tr><tr><td>MCP131T-263E\/TT<\/td><td>Microchip<\/td><td>2.63V open-drain<\/td><td>SOT-23-3<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9754","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=9754"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/9754\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=9754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=9754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=9754"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=9754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}