{"id":7843,"date":"2026-06-28T02:48:20","date_gmt":"2026-06-28T02:48:20","guid":{"rendered":"https:\/\/materialparts.com\/tl431aclp-3\/"},"modified":"2026-06-28T10:20:20","modified_gmt":"2026-06-28T10:20:20","slug":"tl431aclp-3","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/tl431aclp-3\/","title":{"rendered":"TL431ACLP"},"content":{"rendered":"

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

The TL431ACLP is a precision programmable shunt voltage reference from Texas Instruments with 0.5% initial accuracy, 2.495V to 36V adjustable output, and 1mA to 100mA cathode current range in a TO-92 through-hole package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Reference Voltage (Vref)<\/td>\n2.495V typical (VKA = Vref)<\/td>\n<\/tr>\n
Initial Accuracy (A-grade)<\/td>\n\u00b10.5% at 25\u00b0C<\/td>\n<\/tr>\n
Adjustable Output Range<\/td>\nVref to 36V (2.495V to 36V)<\/td>\n<\/tr>\n
Cathode Current Range<\/td>\n1mA to 100mA<\/td>\n<\/tr>\n
Reference Input Current<\/td>\n2\u00b5A typical<\/td>\n<\/tr>\n
Dynamic Impedance<\/td>\n0.2\u03a9 typical<\/td>\n<\/tr>\n
Temperature Stability<\/td>\n10mV typical over -40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n
Supply Voltage (VKA max)<\/td>\n36V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n0\u00b0C to +70\u00b0C (C-grade)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTO-92 (3-pin through-hole)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Precision 2.495V bandgap reference with \u00b10.5% accuracy<\/li>\n
  • Output voltage adjustable from Vref to 36V via external resistors<\/li>\n
  • Low dynamic output impedance: 0.2\u03a9 typical<\/li>\n
  • Wide operating cathode current range: 1mA to 100mA<\/li>\n
  • Low reference input current: 2\u00b5A typical<\/li>\n
  • Active output circuitry for sharp turn-on characteristics<\/li>\n
  • Direct replacement for industry-standard TL431<\/li>\n
  • Multiple grade options for accuracy and temperature range<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Switching power supply feedback loops<\/li>\n
    • Adjustable voltage references<\/li>\n
    • Shunt regulators and voltage monitors<\/li>\n
    • Constant current sources<\/li>\n
    • Overvoltage and undervoltage protection<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TL431ACLP is a precision programmable shunt voltage reference from Texas Instruments with 0.5% initial accuracy, 2.495V to 36V adjustable output, and 1mA to 100mA cathode current range in a TO-92 through-hole package. Key Specifications Reference Voltage (Vref) 2.495V typical (VKA = Vref) Initial Accuracy (A-grade) \u00b10.5% at 25\u00b0C Adjustable Output Range Vref […]<\/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":[19,13],"tags":[],"chip_brand":[138],"class_list":["post-7843","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"Precision programmable shunt reference, 2.495V-36V, 0.5% accuracy, TO-92","date_code":"","package_case":"TO-92 (3-pin through-hole, 5.21 x 4.19mm)","in_stock":12400,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tl431.pdf","price":"$0.58 @ 1ku","product_introduction":"The TL431ACLP is a three-terminal programmable shunt voltage reference from Texas Instruments that combines a precision 2.495V bandgap reference with an error amplifier and open-collector output transistor. The A-grade provides \u00b10.5% initial accuracy at 25\u00b0C. The output voltage can be programmed from Vref (2.495V) to 36V using an external resistor divider. The device sinks 1mA to 100mA cathode current with a low 0.2\u03a9 dynamic output impedance, making it an effective shunt regulator. The C-grade is rated for commercial temperature range (0\u00b0C to +70\u00b0C). It is one of the most widely used voltage references in switching power supply feedback loops worldwide.","working_principle":"The TL431ACLP integrates a temperature-compensated bandgap reference, error amplifier, and NPN output transistor in a three-terminal shunt configuration. The REF pin connects to the inverting input of the internal error amplifier, which compares the external voltage divider output with the 2.495V internal bandgap reference. When the voltage at REF exceeds Vref, the error amplifier drives the NPN output transistor to sink more cathode current, pulling the cathode voltage lower. When REF falls below Vref, the NPN turns off, allowing the cathode voltage to rise. This negative feedback loop regulates the output voltage at Vref \u00d7 (1 + R1\/R2) + Iref \u00d7 R2, where Iref is the 2\u00b5A reference input current. For the simplest configuration with REF tied to CATHODE, the output is fixed at 2.495V. In a switching power supply, the TL431 is typically optocoupled to the primary side controller, with the REF pin monitoring the output voltage through a resistor divider. The low 0.2\u03a9 dynamic impedance ensures the cathode voltage changes minimally with cathode current variations, providing tight regulation.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>REF<\/td>Input<\/td>Reference input (connect to output divider)<\/td><\/tr>\n
      2<\/td>ANODE<\/td>Power<\/td>Anode (connect to GND)<\/td><\/tr>\n
      3<\/td>CATHODE<\/td>Power\/Output<\/td>Cathode (connect to supply via resistor, sinks 1-100mA)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • SMPS Feedback:<\/strong> 0.5% accuracy and low dynamic impedance provide tight output voltage regulation in isolated flyback and forward converters<\/li>\n
      • Adjustable References:<\/strong> External resistor divider sets any voltage from 2.495V to 36V for precision bias applications<\/li>\n
      • Voltage Monitoring:<\/strong> REF pin threshold comparison enables overvoltage and undervoltage detection circuits<\/li>\n
      • Shunt Regulation:<\/strong> 100mA sink capability provides effective shunt regulation for low-power supply rails<\/li>\n
      • Constant Current:<\/strong> Configured with a sense resistor and NPN transistor, the TL431 creates a precision constant current source<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        KA431AZTA<\/td>onsemi<\/td>Direct compatible replacement with identical 2.495V reference and 1-100mA cathode current range<\/td>TO-92-3<\/td>2.495V\/1-100mA<\/td><\/tr>\n
        LM431ACM<\/td>TI<\/td>Direct equivalent in SOIC-8 surface-mount for compact power supply feedback loops<\/td>SOIC-8<\/td>2.495V\/A-grade<\/td><\/tr>\n
        TLV431ACDBZR<\/td>TI<\/td>Low-voltage 1.24V reference version with 80\u00b5A minimum cathode current for low-power designs<\/td>SOT-23-3<\/td>1.24V\/80\u00b5A min<\/td><\/tr>\n
        ATL431LIBQDBZR<\/td>TI<\/td>Ultra-low-power 25\u00b5A min cathode current version for battery-powered and standby circuits<\/td>SOT-23-3<\/td>2.5V\/25\u00b5A min<\/td><\/tr>\n
        LM4040C10IDBZR<\/td>TI<\/td>Fixed 10V precision shunt reference with 0.1% tolerance for high-accuracy voltage regulation<\/td>SOT-23-3<\/td>10V fixed\/0.1%<\/td><\/tr>\n<\/table>\n

        TL431ACLP is an adjustable 2.495-36V shunt voltage regulator in TO-92-3 with \u00b11% A-grade reference tolerance and 1-100mA cathode current. The KA431 and LM431 are direct pin-compatible replacements. TLV431 offers a 1.24V low-voltage reference, while ATL431 provides ultra-low 25\u00b5A minimum cathode current for battery applications. LM4040 provides fixed-voltage precision references.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7843","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=7843"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7843\/revisions"}],"predecessor-version":[{"id":8292,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7843\/revisions\/8292"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7843"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7843"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}