The TL431BQDBZ from Texas Instruments is a precision adjustable shunt regulator in a tiny SOT-23-3 package. It provides a reference voltage of 2.495V with plus or minus 0.5% accuracy (B grade), operates over a cathode current range of 1mA to 100mA, and supports cathode voltages from 2.495V to 36V. The Q suffix denotes extended automotive-qualified temperature range.<\/p>\n
| Reference Voltage<\/td>\n | 2.495V (Typical) @ 25\u00b0C<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Reference Accuracy<\/td>\n | +\/-0.5% (B Grade)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Cathode Current Range<\/td>\n | 1mA ~ 100mA<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Cathode Voltage Range (VKA)<\/td>\n | 2.495V ~ 36V<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Dynamic Impedance<\/td>\n | 0.2Ohm (Typical)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Temperature Coefficient<\/td>\n | 6mV (Typical over C temp range)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Paquete<\/td>\n | SOT-23-3 (2.90 x 1.30mm)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||
| Temperatura de funcionamiento<\/td>\n | -40\u00b0C ~ +125\u00b0C (Q Grade)<\/td>\n<\/tr>\n<\/table>\nCaracter\u00edsticas<\/h2>\nAplicaciones<\/h2>\nProduct Overview The TL431BQDBZ from Texas Instruments is a precision adjustable shunt regulator in a tiny SOT-23-3 package. It provides a reference voltage of 2.495V with plus or minus 0.5% accuracy (B grade), operates over a cathode current range of 1mA to 100mA, and supports cathode voltages from 2.495V to 36V. The Q suffix denotes […]<\/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":[13,29],"tags":[],"chip_brand":[138],"class_list":["post-7019","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"Precision adjustable shunt regulator, 2.495V ref +\/-0.5%, 1-100mA cathode current, 0.2Ohm dynamic impedance in SOT-23-3","date_code":"","package_case":"SOT-23-3 (2.90 x 1.30 x 1.00 mm)","in_stock":8039,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tl431.pdf","price":"$0.35 @ 1ku","product_introduction":"The TL431BQDBZ from Texas Instruments is a three-terminal adjustable shunt regulator with improved thermal stability and +\/-0.5% initial accuracy (B grade). The output voltage can be set to any value between 2.495V (VREF) and 36V using two external resistors. The device operates as a precision Zener diode with a sharp turn-on characteristic and low dynamic impedance of 0.2Ohm. The B grade provides +\/-0.5% reference voltage accuracy over the industrial temperature range, making it suitable for precision power supply feedback loops. The Q suffix indicates qualification for extended temperature operation up to +125\u00b0C.","working_principle":"The TL431BQDBZ operates as a precision shunt regulator using an internal bandgap reference and error amplifier. The REF pin is compared against an internal 2.495V bandgap reference. When the REF pin voltage exceeds VREF, the error amplifier drives the internal Darlington pass transistor harder, increasing cathode current and pulling VKA lower. Conversely, if REF falls below VREF, cathode current decreases. In a typical application, the output voltage is set by a resistor divider: VOUT = VREF x (1 + R1\/R2). The low 0.2Ohm dynamic impedance ensures tight regulation under varying load conditions. The minimum cathode current of 1mA must be maintained for proper regulation.","pin_description":"
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