{"id":2235,"date":"2026-05-16T08:33:08","date_gmt":"2026-05-16T08:33:08","guid":{"rendered":"https:\/\/materialparts.com\/tlvh431aidbzr\/"},"modified":"2026-05-16T08:33:08","modified_gmt":"2026-05-16T08:33:08","slug":"tlvh431aidbzr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/tlvh431aidbzr\/","title":{"rendered":"TLVH431AIDBZR"},"content":{"rendered":"

Productos<\/h2>\n

El TLVH431AIDBZR es un regulador shunt de precisi\u00f3n ajustable de bajo voltaje fabricado por Texas Instruments, que incorpora una referencia bandgap de 1,24 V con una precisi\u00f3n inicial de 1% (grado A). Alojado en un compacto encapsulado de montaje superficial SOT-23-3 (DBZ), admite tensiones de salida ajustables desde VREF (1,24 V) hasta 18 V utilizando dos resistencias externas. El dispositivo funciona en un amplio rango de corriente cat\u00f3dica de 100 uA a 70 mA con una impedancia de salida t\u00edpica de 0,25 Ohm, lo que lo convierte en un excelente sustituto de los diodos Zener de bajo voltaje. En comparaci\u00f3n con el ampliamente utilizado TL431 (referencia de 2,495 V), el TLVH431A ofrece una tensi\u00f3n de referencia m\u00e1s baja (1,24 V) y una corriente cat\u00f3dica m\u00ednima m\u00e1s baja (100 uA frente a 1 mA), lo que permite la regulaci\u00f3n en sistemas de 3 V a 3,3 V. La versi\u00f3n de grado industrial (sufijo I) est\u00e1 especificada de -40 C a +85 C.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Tensi\u00f3n de referencia (VREF)<\/td>\n1,24 V (t\u00edpico)<\/td>\n<\/tr>\n
Tolerancia de tensi\u00f3n de referencia (Grado A, 25 C)<\/td>\n+\/-1%<\/td>\n<\/tr>\n
Rango de tensi\u00f3n de salida ajustable<\/td>\n1,24 V a 18 V<\/td>\n<\/tr>\n
Rango de corriente cat\u00f3dica (IK)<\/td>\n100 uA a 70 mA (continuo)<\/td>\n<\/tr>\n
Corriente cat\u00f3dica m\u00ednima para la regulaci\u00f3n<\/td>\n60 uA (t\u00edp.), 100 uA (m\u00e1x.)<\/td>\n<\/tr>\n
Corriente cat\u00f3dica en estado apagado (IK(off))<\/td>\n0,02 uA (t\u00edpico), 0,1 uA (m\u00e1x.)<\/td>\n<\/tr>\n
Corriente de entrada de referencia (Iref)<\/td>\n0,1 uA (t\u00edpico), 0,5 uA (m\u00e1x.)<\/td>\n<\/tr>\n
Impedancia din\u00e1mica (|zKA|)<\/td>\n0,25 ohmios (t\u00edpico), 0,4 ohmios (m\u00e1x.) a f <= 1 kHz<\/td>\n<\/tr>\n
Variaci\u00f3n de la tensi\u00f3n de referencia frente a la tensi\u00f3n cat\u00f3dica<\/td>\n-1,5 mV\/V (t\u00edpico), -2,7 mV\/V (m\u00e1ximo)<\/td>\n<\/tr>\n
Desviaci\u00f3n VREF sobre temperatura (Grado I)<\/td>\n6 mV (t\u00edp.), 20 mV (m\u00e1x.)<\/td>\n<\/tr>\n
Tensi\u00f3n cat\u00f3dica (VKA, m\u00e1x. absoluto)<\/td>\n20 V<\/td>\n<\/tr>\n
Corriente cat\u00f3dica (m\u00e1x. absoluto)<\/td>\n-25 mA a 80 mA<\/td>\n<\/tr>\n
Corriente de referencia (m\u00e1x. absoluto)<\/td>\n-0,05 mA a 3 mA<\/td>\n<\/tr>\n
Temperatura de funcionamiento de la uni\u00f3n<\/td>\n-40 C a +85 C (Grado I)<\/td>\n<\/tr>\n
Temperatura de almacenamiento<\/td>\n-65 C a +150 C<\/td>\n<\/tr>\n
Clasificaci\u00f3n ESD (HBM)<\/td>\n2000 V (Clase II)<\/td>\n<\/tr>\n
Clasificaci\u00f3n ESD (CDM)<\/td>\n1000 V<\/td>\n<\/tr>\n
Paquete<\/td>\nSOT-23-3 (DBZ), 2,92 x 1,30 mm<\/td>\n<\/tr>\n
Conformidad<\/td>\nRoHS, REACH, EAR99<\/td>\n<\/tr>\n
Clasificaci\u00f3n MSL<\/td>\nNivel-1-260C-UNLIM<\/td>\n<\/tr>\n
Acabado en plomo<\/td>\nNiPdAuAg \/ NiPdAu \/ Sn<\/td>\n<\/tr>\n
Pieza complementaria (pinout alternativo)<\/td>\nTLVH432A (diferente configuraci\u00f3n de patillas SOT-23-3)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Funcionamiento a baja tensi\u00f3n hasta 1,24 V, inferior a TL431 (2,495 V) y TL1431<\/li>\n
  • 1% Precisi\u00f3n de la tensi\u00f3n de referencia inicial (grado A) para una regulaci\u00f3n de precisi\u00f3n<\/li>\n
  • Tensi\u00f3n de salida ajustable de 1,24 V a 18 V con dos resistencias externas<\/li>\n
  • Amplio rango de corriente cat\u00f3dica de funcionamiento: 100 uA a 70 mA<\/li>\n
  • Corriente cat\u00f3dica m\u00ednima muy baja (60 uA t\u00edp.) para aplicaciones de bajo consumo<\/li>\n
  • Impedancia de salida t\u00edpica de 0,25 ohmios para una regulaci\u00f3n estricta<\/li>\n
  • Caracter\u00edstica de encendido agudo: sustituto ideal del diodo Zener<\/li>\n
  • Baja corriente de entrada de referencia: 0,1 uA t\u00edpica, minimizando el error del divisor de resistencias<\/li>\n
  • Baja corriente cat\u00f3dica en estado desactivado: 0,02 uA t\u00edpicos para un consumo m\u00ednimo en modo de espera.<\/li>\n
  • Especificado sobre -40 C a +125 C (grado Q), -40 C a +85 C (grado I)<\/li>\n
  • La variante TLVH432 ofrece pinouts alternativos SOT-23-3 y SOT-89<\/li>\n
  • Opci\u00f3n de encapsulado ultrapeque\u00f1o SC-70 (DCK) - 40% m\u00e1s peque\u00f1o que SOT-23-3<\/li>\n
  • Calificaci\u00f3n AEC-Q100 (Grado 1) disponible en versiones Q-suffix<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Referencia de tensi\u00f3n ajustable para convertidores de datos y sistemas ADC\/DAC<\/li>\n
    • Regulaci\u00f3n del lado secundario en SMPS flyback aisladas (salidas de 3 V a 3,3 V) con retroalimentaci\u00f3n de optoacoplador.<\/li>\n
    • Sustituci\u00f3n de diodos Zener de baja fuga en circuitos de regulaci\u00f3n de a bordo<\/li>\n
    • Limitador de corriente de precisi\u00f3n y circuitos de disipaci\u00f3n de corriente constante<\/li>\n
    • Control de la tensi\u00f3n y supervisi\u00f3n de los ra\u00edles de alimentaci\u00f3n en los sistemas de gesti\u00f3n de la energ\u00eda<\/li>\n
    • Comparador con referencia de banda prohibida de 1,24 V integrada<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TLVH431AIDBZR is a low-voltage adjustable precision shunt regulator manufactured by Texas Instruments, featuring a 1.24 V bandgap reference with 1% initial accuracy (A grade). Housed in a compact SOT-23-3 (DBZ) surface-mount package, it supports adjustable output voltages from VREF (1.24 V) to 18 V using two external resistors. The device operates over […]<\/p>\n","protected":false},"author":2,"featured_media":2236,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[],"chip_brand":[138],"class_list":["post-2235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"Adjustable precision shunt regulator, 1.24V ref, 1% A-grade, VO=1.24-18V, IK=0.1-70mA, 0.25Ohm zKA, SOT-23-3, -40 to 85C","date_code":"","package_case":"SOT-23-3 (DBZ), 2.92 x 1.30 x 1.22 mm","in_stock":2930,"datasheet":"https:\/\/www.ti.com\/product\/TLVH431A","price":"$0.182 @ 1ku","product_introduction":"The TLVH431AIDBZR is a low-voltage adjustable precision shunt regulator from Texas Instruments, featuring an internal 1.24 V bandgap reference with 1% initial accuracy (A grade) at 25 C. As a three-terminal device, the output voltage can be programmed to any value between VREF (1.24 V) and 18 V by using two external resistive dividers connected to the REF pin. This architecture enables flexible voltage regulation without requiring a fixed-voltage Zener diode for each target output level. The device operates from a minimum cathode current of just 60 uA (typical), significantly lower than the TL431 which requires 1 mA, making it ideal for low-power and battery-operated systems. The wide cathode current range of 100 uA to 70 mA provides substantial design margin for both biasing and load-driving scenarios. With a typical dynamic output impedance of 0.25 Ohm, the TLVH431A delivers tight voltage regulation that outperforms standard Zener diodes by an order of magnitude. The active output circuitry provides a sharp turn-on characteristic, enabling precise threshold behavior in comparator and monitoring applications. When paired with an optocoupler, the TLVH431A serves as the voltage reference and error amplifier in isolated feedback loops for 3 V to 3.3 V switching-mode power supplies, where its low reference voltage enables direct regulation of low-voltage outputs. The industrial-grade (I suffix) version is fully specified from -40 C to +85 C, while Q-suffix versions extend to +125 C with AEC-Q100 Grade 1 qualification for automotive applications.","working_principle":"The TLVH431A operates as a precision shunt regulator through three functional subsystems:\n\n1. Bandgap Reference and Error Amplifier: The core of the device is an internal 1.24 V bandgap voltage reference connected to the non-inverting input of a high-gain comparator. The REF pin serves as the inverting input to this comparator. When the voltage at the REF pin exceeds the internal 1.24 V reference, the error amplifier drives the output Darlington stage to sink more cathode current. Conversely, when the REF pin voltage falls below 1.24 V, the amplifier reduces cathode current. This negative feedback loop forces the REF pin to maintain 1.24 V when the device is in regulation, establishing a stable voltage reference point.\n\n2. Adjustable Output Voltage via External Resistor Divider: When configured with two external resistors R1 (from cathode to REF) and R2 (from REF to anode), the output voltage at the cathode is determined by: VO = VREF x (1 + R1\/R2) + Iref x R1. Since Iref is typically only 0.1 uA, the Iref x R1 term is negligible for resistor values below 10 kOhm, yielding VO approximately equal to VREF x (1 + R1\/R2). This allows the output voltage to be set from 1.24 V (R1 = 0) up to 18 V (R1\/R2 ratio permitting), providing flexibility across a wide range of applications.\n\n3. Shunt Regulation and Dynamic Impedance: The device regulates by shunting excess current from the cathode to the anode. When the output voltage rises above the programmed setpoint, the internal Darlington pair conducts more heavily, sinking additional current and pulling the cathode voltage down. The dynamic output impedance of 0.25 Ohm (typical at f <= 1 kHz) quantifies how effectively the device maintains regulation against load current variations. In the off state (REF pin below 1.24 V), cathode current drops to just 0.02 uA (typical), minimizing power dissipation during standby conditions.","pin_description":"\n
      Pin No.<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>REF<\/td>Input<\/td>Reference input. Connected to the internal error amplifier inverting input. The device regulates to maintain this pin at 1.24 V relative to ANODE. A resistive divider from CATHODE to ANODE sets the desired output voltage. Reference input current is typically 0.1 uA, minimizing divider loading error.<\/td><\/tr>\n
      2<\/td>CATHODE<\/td>I\/O<\/td>Shunt current output and voltage input. In regulation, current flows into this pin and out through ANODE. The cathode voltage is the regulated output. When REF exceeds 1.24 V, cathode current increases to pull the voltage down; when REF falls below 1.24 V, cathode current decreases. Maximum continuous cathode current: 70 mA.<\/td><\/tr>\n
      3<\/td>ANODE<\/td>Ground<\/td>Common return terminal, normally connected to circuit ground. All voltage measurements are referenced to this pin. Current flowing into the cathode exits through the anode.<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Isolated SMPS feedback regulation: Paired with an optocoupler in the secondary side of 3 V to 3.3 V flyback converters, the TLVH431A compares a fraction of the output voltage against its 1.24 V reference and drives the optocoupler LED to close the feedback loop, enabling precise output regulation with +\/-1% accuracy.<\/li>\n
      • On-board adjustable voltage reference: Using two external resistors, the device provides a programmable reference from 1.24 V to 18 V for ADC\/DAC voltage references, bias networks, or comparator thresholds without needing multiple fixed-voltage Zener diodes.<\/li>\n
      • Low-leakage Zener replacement: With off-state current of only 0.02 uA and sharp turn-on, the TLVH431A replaces Zener diodes in applications requiring precise voltage clamping with minimal leakage and tight tolerance, such as voltage monitoring and protection circuits.<\/li>\n
      • Precision current sink: Configured with a sense resistor at the REF pin, the device maintains a constant voltage across the resistor, establishing a precision constant-current sink for LED bias, sensor excitation, or battery charging circuits.<\/li>\n
      • Power-rail voltage monitor: The sharp threshold at 1.24 V and low reference current make this device suitable for undervoltage and overvoltage detection when combined with a resistive divider and a pull-up resistor on the cathode.<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Key Notes<\/th><\/tr>\n
        Texas Instruments<\/td>TLVH431BIDBZR<\/td>SOT-23-3<\/td>Higher precision B grade (0.5%), pin-compatible, same VREF and current range<\/td><\/tr>\n
        Texas Instruments<\/td>TLVH432AIDBZR<\/td>SOT-23-3<\/td>Alternative SOT-23-3 pinout (CATHODE=1, REF=2 swapped vs TLVH431), same electrical specs<\/td><\/tr>\n
        onsemi<\/td>NCP431AIDBZR<\/td>SOT-23-3<\/td>Pin-compatible, 1% A grade, 1.24 V ref, 80 mA max cathode current<\/td><\/tr>\n
        Diodes Incorporated<\/td>AP431A<\/td>SOT-23-3<\/td>Pin-compatible shunt regulator, 1% tolerance, 1.24 V reference, 80 mA cathode current<\/td><\/tr>\n
        STMicroelectronics<\/td>TS431ACX<\/td>SOT-23-3<\/td>Adjustable 1.24 V shunt reference, 1% grade A, pin-compatible, 30 mA cathode current<\/td><\/tr>\n
        Texas Instruments<\/td>TL431AIDBZR<\/td>SOT-23-3<\/td>Higher reference voltage (2.495 V), same pinout, for applications needing VREF > 2.5 V<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/2235","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=2235"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/2235\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media\/2236"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=2235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=2235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=2235"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=2235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}