{"id":7087,"date":"2026-06-23T03:36:40","date_gmt":"2026-06-23T03:36:40","guid":{"rendered":"https:\/\/materialparts.com\/tl431bqdbzr\/"},"modified":"2026-06-23T03:36:40","modified_gmt":"2026-06-23T03:36:40","slug":"tl431bqdbzr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/tl431bqdbzr\/","title":{"rendered":"TL431BQDBZR"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The TL431BQDBZR from Texas Instruments is a precision programmable shunt voltage reference with 0.5% initial accuracy (B grade) and AEC-Q100 automotive qualification in a SOT-23-3 package. Providing a reference voltage adjustable from 2.495V to 36V with 0.5% tolerance, it is ideal for automotive power supply feedback loops and voltage monitoring circuits.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n
Reference Voltage<\/td>\n2.495V to 36V (adjustable)<\/td>\n<\/tr>\n
Initial Accuracy (B grade)<\/td>\n+\/-0.5%<\/td>\n<\/tr>\n
Min Cathode Current<\/td>\n1 mA (typ)<\/td>\n<\/tr>\n
Max Cathode Current<\/td>\n100 mA<\/td>\n<\/tr>\n
Dynamic Impedance<\/td>\n0.2 Ohm (typ)<\/td>\n<\/tr>\n
Temperature Drift<\/td>\n6 mV (typ over -40 to +125C)<\/td>\n<\/tr>\n
AEC-Q100<\/td>\nYes (Grade 1)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +125C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • AEC-Q100 Grade 1 qualified for automotive applications<\/li>\n
  • +\/-0.5% initial accuracy (B grade) for tight regulation<\/li>\n
  • Adjustable output voltage from 2.495V to 36V via external resistor divider<\/li>\n
  • Low dynamic impedance of 0.2 Ohm for stable reference<\/li>\n
  • Wide operating cathode current range of 1mA to 100mA<\/li>\n
  • Industry-standard SOT-23-3 pinout<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Automotive SMPS feedback loop compensation<\/li>\n
    • Voltage monitoring and overvoltage protection<\/li>\n
    • Linear regulator reference voltage<\/li>\n
    • Battery charger voltage regulation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TL431BQDBZR from Texas Instruments is a precision programmable shunt voltage reference with 0.5% initial accuracy (B grade) and AEC-Q100 automotive qualification in a SOT-23-3 package. Providing a reference voltage adjustable from 2.495V to 36V with 0.5% tolerance, it is ideal for automotive power supply feedback loops and voltage monitoring circuits. Key Specifications […]<\/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":[],"chip_brand":[138],"class_list":["post-7087","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"Programmable shunt reference, 2.495-36V, +\/-0.5%, AEC-Q100, SOT-23-3, automotive","date_code":"","package_case":"SOT-23-3 (2.90 x 1.30 x 1.00 mm)","in_stock":14500,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tl431b-q1.pdf","price":"$0.32 @ 1ku","product_introduction":"The TL431BQDBZR from Texas Instruments is an AEC-Q100 Grade 1 qualified precision programmable shunt voltage reference in a SOT-23-3 package. The B grade provides +\/-0.5% initial reference voltage accuracy. The output voltage is programmable from 2.495V to 36V using two external resistors. The device features low dynamic impedance of 0.2 Ohm typical, wide operating cathode current range of 1mA to 100mA, and typical temperature drift of 6mV over -40C to +125C. It is pin-compatible with industry-standard TL431 devices and suitable for automotive SMPS feedback loops, voltage monitoring, and voltage regulation circuits.","working_principle":"The TL431BQDBZR is a three-terminal shunt regulator that maintains a precise voltage at the REF pin. (1) Internal Reference: An internal 2.495V bandgap reference is compared to the voltage at the REF pin by an internal error amplifier. (2) Feedback Loop: When VREF exceeds 2.495V, the cathode current increases, pulling more current through the external series resistor and reducing the output voltage. When VREF is below 2.495V, cathode current decreases. This negative feedback regulates the output voltage. (3) Voltage Programming: Two external resistors (R1, R2) form a divider from the output to GND with the midpoint connected to REF. The output voltage is Vout = Vref x (1 + R1\/R2) + Iref x R1, where Iref is typically 2uA. (4) Shunt Regulation: The device shunts excess current to maintain regulation, with the cathode current range of 1-100mA setting the regulation capability.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>REF<\/td>Input<\/td>Reference input (2.495V threshold)<\/td><\/tr>
      2<\/td>ANODE<\/td>Power<\/td>Anode (ground connection)<\/td><\/tr>
      3<\/td>CATHODE<\/td>Output<\/td>Cathode (shunt output)<\/td><\/tr><\/table>","application_scenarios":"
      • Automotive SMPS optocoupler feedback loop with 0.5% accuracy<\/li>
      • Voltage monitoring and overvoltage detection in automotive systems<\/li>
      • Linear regulator and LDO reference voltage generation<\/li>
      • Battery charger voltage regulation with adjustable setpoint<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>TL431AQDBZR<\/td>SOT-23-3<\/td>1% accuracy, AEC-Q100<\/td><\/tr>
        onsemi<\/td>TL431BQDBZT1G<\/td>SOT-23-3<\/td>0.5%, AEC-Q100<\/td><\/tr>
        STMicroelectronics<\/td>TL431BIDBZR<\/td>SOT-23-3<\/td>0.5%, not automotive<\/td><\/tr>
        Diodes Inc<\/td>TL431BQDBZR<\/td>SOT-23-3<\/td>0.5%, AEC-Q100<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7087","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=7087"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7087\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7087"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7087"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7087"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}