{"id":5447,"date":"2026-06-10T02:08:02","date_gmt":"2026-06-10T02:08:02","guid":{"rendered":"https:\/\/materialparts.com\/tl431aqdbzr\/"},"modified":"2026-06-10T02:08:02","modified_gmt":"2026-06-10T02:08:02","slug":"tl431aqdbzr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/tl431aqdbzr\/","title":{"rendered":"TL431AQDBZR"},"content":{"rendered":"

Productos<\/h2>\n

The TL431AQDBZR from Texas Instruments is a precision adjustable shunt voltage reference in a 3-pin SOT-23 package. With 1% initial accuracy (A-grade), 2.495V reference, adjustable output from Vref to 36V, 0.2 ohm dynamic impedance, and -40 to 125C operation, it is the industry-standard Zener diode replacement for power supply feedback and voltage regulation.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Reference Voltage<\/td>\n2.495V typical (2.470-2.520V, A-grade)<\/td>\n<\/tr>\n
Initial Accuracy<\/td>\n+\/-1% (A-grade)<\/td>\n<\/tr>\n
Adjustable Output<\/td>\nVref to 36V<\/td>\n<\/tr>\n
Cathode Current<\/td>\n1 mA to 100 mA<\/td>\n<\/tr>\n
Min Regulation Current<\/td>\n0.6 mA max<\/td>\n<\/tr>\n
Dynamic Impedance<\/td>\n0.2 ohm typical<\/td>\n<\/tr>\n
Temperature Drift<\/td>\n14 mV typical (I\/Q temp)<\/td>\n<\/tr>\n
Reference Input Current<\/td>\n2 uA typical<\/td>\n<\/tr>\n
Off-State Current<\/td>\n0.1 uA typical<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40 to +125 C (Q-grade)<\/td>\n<\/tr>\n
Paquete<\/td>\nSOT-23-3 (2,9 x 1,3 mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • +\/-1% reference voltage accuracy (A-grade)<\/li>\n
  • Adjustable output: Vref to 36V via 2 resistors<\/li>\n
  • 0.2 ohm low dynamic impedance<\/li>\n<\/ul>\n
      \n
    • 1-100mA sink current range<\/li>\n
    • Sharp turn-on characteristic<\/li>\n
    • -40 to +125C operation (Q-grade)<\/li>\n
    • Industry-standard pinout<\/li>\n
    • Direct Zener diode replacement<\/li>\n
    • AEC-Q100 qualified (Nexperia version)<\/li>\n<\/ul>\n

      Aplicaciones<\/h2>\n
        \n
      • Switching power supply feedback<\/li>\n
      • Adjustable voltage regulation<\/li>\n
      • Online voltage reference<\/li>\n
      • Overvoltage\/undervoltage protection<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

        Product Overview The TL431AQDBZR from Texas Instruments is a precision adjustable shunt voltage reference in a 3-pin SOT-23 package. With 1% initial accuracy (A-grade), 2.495V reference, adjustable output from Vref to 36V, 0.2 ohm dynamic impedance, and -40 to 125C operation, it is the industry-standard Zener diode replacement for power supply feedback and voltage regulation. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,32],"tags":[],"chip_brand":[138],"class_list":["post-5447","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"Adj shunt ref 2.495V, 1%, 0.2ohm, -40 to 125C, SOT-23-3","date_code":"","package_case":"SOT-23-3 (2.9 x 1.3 x 1.0 mm)","in_stock":99726,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tl431.pdf","price":"$0.09 @ 1ku","product_introduction":"The TL431AQDBZR from Texas Instruments is a three-terminal adjustable precision shunt regulator in a 3-pin SOT-23 package. The A suffix denotes 1% initial reference voltage accuracy, Q denotes the automotive\/extended temperature range (-40 to +125C), DBZ denotes the SOT-23-3 package, and R denotes tape and reel. The TL431 is the industry-standard Zener diode replacement, providing a 2.495V bandgap reference with programmable output voltage from Vref to 36V using two external resistors. The 0.2 ohm typical dynamic impedance and sharp turn-on characteristic make it ideal for switching power supply optocoupler feedback loops. The Q-grade temperature range ensures reliable operation in automotive and industrial environments. With over 100mA sink current capability and only 0.6mA minimum regulation current, the TL431AQDBZR covers a wide range of shunt regulation applications.","working_principle":"The TL431AQDBZR operates as a precision shunt regulator: (1) Reference Comparison: An internal bandgap reference of approximately 2.495V is compared with the voltage at the REF pin. When VREF exceeds Vref (2.495V), the cathode (K) conducts current from cathode to anode (A), pulling VKA down. When VREF is below Vref, the cathode current is essentially zero (off-state, 0.1uA typical). (2) Output Voltage Setting: Two external resistors R1 (top) and R2 (bottom) form a voltage divider from VKA to ground. The REF pin connects to the junction: VREF = VKA x R2\/(R1+R2). Setting VREF = Vref gives VKA = Vref x (1 + R1\/R2). This allows VKA to be set to any value from Vref to 36V. (3) Shunt Regulation: The device acts as a shunt element, conducting more or less current to maintain VREF at Vref. The 0.2 ohm dynamic impedance (at low frequency) ensures tight regulation. The 1mA to 100mA operating cathode current range provides wide regulation authority. (4) Power Supply Feedback: In switching power supplies, the TL431 compares the output voltage (via resistor divider) with its internal reference and drives an optocoupler LED to provide feedback to the primary side controller. The sharp turn-on characteristic and high open-loop gain ensure precise output voltage regulation.","pin_description":"
        Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
        1<\/td>REF<\/td>Input<\/td>Reference input (2.495V threshold)<\/td><\/tr>
        2<\/td>Anode<\/td>Power<\/td>Anode (ground reference)<\/td><\/tr>
        3<\/td>Cathode<\/td>Output<\/td>Cathode (current sink output)<\/td><\/tr><\/table>","application_scenarios":"
        • Switching power supply optocoupler feedback with 1% output accuracy and 0.2ohm dynamic impedance<\/li>
        • Adjustable voltage regulator from 2.495V to 36V using two external resistors in -40 to 125C environment<\/li>
        • Overvoltage protection clamp with sharp turn-on and 100mA sink current in automotive applications<\/li>
        • Precision voltage reference for ADC\/DAC with +\/-1% initial accuracy and low 2uA reference input current<\/li><\/ul>","alternative_models":"
          Model<\/th>Manufacturer<\/th>Accuracy<\/th>Temp Range<\/th>Notes<\/th><\/tr>
          TL431BIQDBZR<\/td>TI<\/td>0.5%<\/td>-40 to 125C<\/td>Higher accuracy B-grade<\/td><\/tr>
          TL431AIDBZR<\/td>TI<\/td>1%<\/td>-40 to 85C<\/td>Industrial temp only<\/td><\/tr>
          KA431AZTA<\/td>onsemi<\/td>1%<\/td>-40 to 85C<\/td>Second source<\/td><\/tr>
          TLV431AQDBZR<\/td>TI<\/td>1%<\/td>-40 to 125C<\/td>1.24V ref, lower voltage<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5447","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=5447"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5447\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=5447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=5447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=5447"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=5447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}