{"id":11157,"date":"2026-07-24T14:40:44","date_gmt":"2026-07-24T14:40:44","guid":{"rendered":"https:\/\/ic-vendor.com\/l4949edtr-e\/"},"modified":"2026-07-24T14:40:44","modified_gmt":"2026-07-24T14:40:44","slug":"l4949edtr-e","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/es\/l4949edtr-e\/","title":{"rendered":"L4949EDTR-E"},"content":{"rendered":"

Productos<\/h2>\n

The STMicroelectronics L4949EDTR-E is an automotive multifunction very low dropout 5V voltage regulator with power-on reset and input voltage sense. AEC-Q100 qualified, it operates from 5V to 28V DC supply with 40V transient capability and delivers up to 100mA output current in an SO-8 package.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n5V (fixed, \u00b12% over line\/load)<\/td>\n<\/tr>\n
Max Output Current<\/td>\n100 mA<\/td>\n<\/tr>\n
Input Voltage (DC)<\/td>\n5 V to 28 V<\/td>\n<\/tr>\n
Transient Input Voltage<\/td>\n40 V (t < 1s)<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n<0.5 V @ 100 mA<\/td>\n<\/tr>\n
Standby Output Accuracy<\/td>\n5V \u00b11%<\/td>\n<\/tr>\n
Quiescent Current (Standby)<\/td>\n200 \u00b5A typ (low output)<\/td>\n<\/tr>\n
Reset Threshold<\/td>\n4.5V typ<\/td>\n<\/tr>\n
Sense Comparator Threshold<\/td>\n1.23V internal ref<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +150\u00b0C (TJ)<\/td>\n<\/tr>\n
Paquete<\/td>\nSO-8 (4.9×3.9mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • AEC-Q100 automotive qualified<\/li>\n
  • Very low dropout voltage (<0.5V)<\/li>\n
  • Power-on reset with programmable delay<\/li>\n
  • Input voltage sense comparator with open-collector output<\/li>\n
  • Extremely low quiescent current in standby<\/li>\n
  • Thermal shutdown and short-circuit protection<\/li>\n
  • ECOPACK2, RoHS compliant<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Automotive ECU power supply<\/li>\n
    • Microcontroller 5V rail regulation<\/li>\n
    • Body electronics and gateway modules<\/li>\n
    • Industrial 24V bus powered systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The STMicroelectronics L4949EDTR-E is an automotive multifunction very low dropout 5V voltage regulator with power-on reset and input voltage sense. AEC-Q100 qualified, it operates from 5V to 28V DC supply with 40V transient capability and delivers up to 100mA output current in an SO-8 package. Key Specifications Output Voltage 5V (fixed, \u00b12% over […]<\/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":[13,32],"tags":[2428],"chip_brand":[142],"class_list":["post-11157","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","tag-l4949edtr-e","chip_brand-st"],"acf":{"brief_explanation":"Automotive 5V LDO, 5-28V in, 100mA out, <0.5V dropout, POR + voltage sense, AEC-Q100, SO-8","date_code":"","package_case":"SO-8 (4.9x3.9mm)","in_stock":8423,"datasheet":"https:\/\/www.st.com\/resource\/en\/datasheet\/l4949ep-e.pdf","price":"$0.47 @ 500+","product_introduction":"The L4949EDTR-E from STMicroelectronics is a monolithic integrated 5V voltage regulator with very low dropout and additional functions including power-on reset and input voltage sense. Designed for microcomputer-controlled systems in automotive applications, it operates from 5V to 28V DC supply (40V transient) and delivers up to 100mA output. The device features a precision 5V\u00b11% standby output, programmable reset pulse delay via external capacitor, and a sense comparator with open-collector output for monitoring input voltage. AEC-Q100 qualified and ECOPACK2 compliant.","working_principle":"The L4949ED uses a low-dropout pass element to regulate the 5V output. An internal reference and error amplifier maintain output voltage regulation across line and load variations. The reset circuit monitors the output voltage and generates a reset pulse when it falls below the threshold (4.5V typ), with delay programmable via the CT pin capacitor. The sense comparator compares a divided input voltage against a 1.23V internal reference and pulls the SO output low when the input drops below threshold. A preregulator (VZ pin) provides an internal stabilized supply. Thermal shutdown activates at 165\u00b0C junction temperature.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>VS<\/td>Power<\/td>Input supply voltage<\/td><\/tr>
      2<\/td>SI<\/td>Input<\/td>Sense input (voltage divider from VS)<\/td><\/tr>
      3<\/td>VZ<\/td>Output<\/td>Preregulator output<\/td><\/tr>
      4<\/td>CT<\/td>Input<\/td>Reset pulse delay capacitor<\/td><\/tr>
      5<\/td>GND<\/td>Ground<\/td>Ground reference<\/td><\/tr>
      6<\/td>RES<\/td>Output<\/td>Reset output (active low)<\/td><\/tr>
      7<\/td>SO<\/td>Output<\/td>Sense output (open collector)<\/td><\/tr>
      8<\/td>VOUT<\/td>Output<\/td>Regulated 5V output<\/td><\/tr><\/table>","application_scenarios":"
      • Automotive ECU 5V microcontroller supply<\/li>
      • Power-on reset generation for MCUs<\/li>
      • Input voltage monitoring with sense comparator<\/li>
      • Industrial 24V bus systems with transient protection<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        L4949EP-E<\/td>STMicroelectronics<\/td>SO-20W package variant<\/td><\/tr>
        TL431<\/td>TI<\/td>Adjustable shunt regulator (different topology)<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/posts\/11157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/comments?post=11157"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/posts\/11157\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/media?parent=11157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/categories?post=11157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/tags?post=11157"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/chip_brand?post=11157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}