{"id":7915,"date":"2026-06-28T04:21:29","date_gmt":"2026-06-28T04:21:29","guid":{"rendered":"https:\/\/materialparts.com\/tl431aclp-4\/"},"modified":"2026-06-28T11:46:09","modified_gmt":"2026-06-28T11:46:09","slug":"tl431aclp-4","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/tl431aclp-4\/","title":{"rendered":"TL431ACLP"},"content":{"rendered":"

Productos<\/h2>\n

The TL431ACLP is a precision programmable shunt voltage reference from Texas Instruments with 2.495V to 36V adjustable output, \u00b10.5% initial accuracy, and 1mA to 100mA cathode current range in a TO-92 through-hole package.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Reference Voltage (Vref)<\/td>\n2.495V typical (2.470V to 2.520V for A-grade)<\/td>\n<\/tr>\n
Adjustable Output Range<\/td>\nVref to 36V<\/td>\n<\/tr>\n
Initial Accuracy (A-grade)<\/td>\n\u00b10.5% at 25\u00b0C<\/td>\n<\/tr>\n
Cathode Current (IKA)<\/td>\n1mA to 100mA<\/td>\n<\/tr>\n
Dynamic Impedance<\/td>\n0.2\u03a9 typical (below Vref)<\/td>\n<\/tr>\n
Reference Input Current<\/td>\n2\u00b5A typical<\/td>\n<\/tr>\n
Temperature Coefficient<\/td>\n30ppm\/\u00b0C typical (C-grade: 0-70\u00b0C)<\/td>\n<\/tr>\n
Cathode-Anode Voltage (Max)<\/td>\n37V<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n0\u00b0C to +70\u00b0C (C-grade)<\/td>\n<\/tr>\n
Paquete<\/td>\nTO-92-3 (5.2 x 4.2mm, through-hole)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Programmable shunt voltage reference<\/li>\n
  • 2.495V to 36V output range<\/li>\n
  • \u00b10.5% initial accuracy (A-grade)<\/li>\n
  • 0.2\u03a9 dynamic impedance<\/li>\n
  • Low reference pin current: 2\u00b5A typical<\/li>\n
  • Wide cathode current range: 1mA to 100mA<\/li>\n
  • Direct replacement for TL431, LM431, etc.<\/li>\n
  • Low temperature drift: 30ppm\/\u00b0C typical<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Switch-mode power supply feedback<\/li>\n
    • Precision voltage reference<\/li>\n
    • Shunt regulator<\/li>\n
    • Voltage monitoring and comparison<\/li>\n
    • OVP and OCP circuits<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TL431ACLP is a precision programmable shunt voltage reference from Texas Instruments with 2.495V to 36V adjustable output, \u00b10.5% initial accuracy, and 1mA to 100mA cathode current range in a TO-92 through-hole package. Key Specifications Reference Voltage (Vref) 2.495V typical (2.470V to 2.520V for A-grade) Adjustable Output Range Vref to 36V Initial Accuracy […]<\/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":[13,24],"tags":[],"chip_brand":[138],"class_list":["post-7915","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-processors","chip_brand-ti"],"acf":{"brief_explanation":"Programmable shunt ref, 2.495V-36V, \u00b10.5%, 0.2\u03a9 Zka, TO-92","date_code":"","package_case":"TO-92-3 (5.2 x 4.2 x 4.2mm, 2.54mm pitch, through-hole)","in_stock":18000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tl431a.pdf","price":"$0.38 @ 1ku","product_introduction":"The TL431ACLP from Texas Instruments is a three-terminal programmable shunt voltage reference that functions as a precision zener diode with adjustable breakdown voltage from 2.495V to 36V. When the reference pin (REF) voltage exceeds 2.495V, the cathode (KA) conducts, pulling current away from the load. This negative feedback action is used in SMPS feedback loops: the output voltage is divided down by two resistors to the REF pin, and the TL431 shunts current through an optocoupler LED to the primary side, closing the regulation loop. The \u00b10.5% initial accuracy (A-grade) and 30ppm\/\u00b0C temperature drift provide precision regulation over temperature. The 0.2\u03a9 dynamic impedance means the cathode voltage changes only 0.2mV per mA of cathode current change, providing excellent load regulation. The C-grade is specified for 0\u00b0C to +70\u00b0C, and the LP suffix denotes the TO-92 through-hole package.","working_principle":"The TL431ACLP operates as a precision shunt regulator with an internal 2.495V bandgap reference and an open-collector error amplifier. The REF pin is connected to the internal reference comparator's non-inverting input. When VREF exceeds the internal 2.495V reference, the error amplifier drives the output transistor (between cathode and anode) to conduct more current. This increased cathode current flows through an external series resistor, dropping more voltage and reducing VREF back toward 2.495V. For a simple shunt regulator, VOUT = VREF \u00d7 (1 + R1\/R2) + IREF \u00d7 R1 \u2248 2.495 \u00d7 (1 + R1\/R2), where R1 is the upper divider resistor (VOUT to REF) and R2 is the lower divider resistor (REF to ANODE). For VOUT = 5V, R1\/R2 \u2248 1.0, so R1 = R2 = 10k\u03a9. The minimum cathode current of 1mA is required for proper regulation; below this, the device may not regulate accurately. In an SMPS application, the cathode connects through a resistor and optocoupler LED to the output rail; the REF pin monitors the divided output voltage; and the anode connects to the output ground. When the output rises, the TL431 conducts more, increasing optocoupler LED current, which reduces the primary-side PWM duty cycle, bringing the output back to the setpoint.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>REF<\/td>Input<\/td>Reference input pin. The device regulates to maintain 2.495V at this pin relative to Anode (\u00b10.5% for A-grade). Input bias current is 2\u00b5A typical. Connect a voltage divider from Cathode to REF to Anode to set the desired output voltage. The reference voltage is internally trimmed to 2.495V at 25\u00b0C with 10ppm\/\u00b0C typical drift.<\/td><\/tr>\n
      2<\/td>Anode<\/td>Power<\/td>Anode (ground reference) pin. Connects to the most negative point in the circuit. All voltages are referenced to this pin. Maximum anode-cathode voltage is 37V. This pin carries the full operating current minus the cathode current.<\/td><\/tr>\n
      3<\/td>Cathode<\/td>Output<\/td>Cathode (output) pin. Draws current to regulate the voltage at the REF pin to 2.495V. Operating cathode current range is 1mA to 100mA. Minimum operating current (Imin) is 0.5mA typical (1mA max) to maintain regulation. Dynamic impedance is 0.2\u03a9 typical above Imin.<\/td><\/tr>\n<\/table>\n

      TL431ACLP pin assignment (TO-92-3, flat face toward you, pins down): Pin 1 (left) = REF, Pin 2 (center) = Anode, Pin 3 (right) = Cathode. In SOT-23-3 (DBZR) package: Pin 1 = REF, Pin 2 = Anode, Pin 3 = Cathode. In SOIC-8: Pin 1-4 = NC, Pin 5 = Cathode, Pin 6 = NC, Pin 7 = REF, Pin 8 = Anode. For basic shunt regulator, connect REF to Cathode for 2.495V fixed output, or use voltage divider for higher output voltages (Vout = 2.495V \u00d7 (1 + R1\/R2)).<\/p>","application_scenarios":"

        \n
      • SMPS Feedback:<\/strong> Output voltage divided to REF; cathode drives optocoupler LED; regulates isolated 5V\/12V\/24V outputs<\/li>\n
      • Adjustable Zener:<\/strong> R1\/R2 sets VOUT from 2.495V to 36V; replaces fixed zener with precision, adjustable voltage<\/li>\n
      • Voltage Monitor:<\/strong> REF monitors divided rail voltage; cathode pulls down enable pin when voltage exceeds threshold<\/li>\n
      • OVP Circuit:<\/strong> Cathode triggers SCR gate when REF exceeds 2.495V; crowbar protects downstream circuitry<\/li>\n
      • Current Source:<\/strong> Series resistor + TL431 creates precision constant-current sink; I = VREF\/R2<\/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\/es\/wp-json\/wp\/v2\/posts\/7915","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=7915"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7915\/revisions"}],"predecessor-version":[{"id":8241,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7915\/revisions\/8241"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7915"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7915"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7915"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}