{"id":8754,"date":"2026-06-30T07:06:38","date_gmt":"2026-06-30T07:06:38","guid":{"rendered":"https:\/\/materialparts.com\/atl431liaqdbzrq1\/"},"modified":"2026-06-30T07:06:38","modified_gmt":"2026-06-30T07:06:38","slug":"atl431liaqdbzrq1","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/atl431liaqdbzrq1\/","title":{"rendered":"ATL431LIAQDBZRQ1"},"content":{"rendered":"

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The ATL431LIAQDBZRQ1 is a Texas Instruments AEC-Q100 qualified automotive-grade adjustable precision shunt voltage reference with 1.24V internal reference. It offers 0.5% initial accuracy (B grade), 100 uA to 150 mA cathode current range, and adjustable output from 1.24V to 18V. Packaged in SOT-23-3 (DBZ) rated for -40C to +125C.<\/p>\n

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VREF<\/td>\n1.24 V (typical)<\/td>\n<\/tr>\n
Initial Accuracy<\/td>\n0.5% (B grade)<\/td>\n<\/tr>\n
Cathode Current<\/td>\n100 uA to 150 mA<\/td>\n<\/tr>\n
Output Range<\/td>\nVREF to 18 V (adjustable)<\/td>\n<\/tr>\n
Rating<\/td>\nAEC-Q100 automotive<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nSOT-23-3<\/td>\n<\/tr>\n<\/table>\n

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    \n
  • AEC-Q100 Grade 0 qualified (up to 150C TJ)<\/li>\n
  • 0.5% reference accuracy (B grade)<\/li>\n
  • 1.24V low reference voltage<\/li>\n
  • Adjustable output to 18V<\/li>\n
  • 100uA min cathode current<\/li>\n
  • 0.15 ohm typical output impedance<\/li>\n
  • SOT-23-3 compact package<\/li>\n<\/ul>\n

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      \n
    • Automotive SMPS secondary feedback<\/li>\n
    • Vehicle voltage monitoring<\/li>\n
    • Automotive LDO reference<\/li>\n
    • On-board charger regulation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The ATL431LIAQDBZRQ1 is a Texas Instruments AEC-Q100 qualified automotive-grade adjustable precision shunt voltage reference with 1.24V internal reference. It offers 0.5% initial accuracy (B grade), 100 uA to 150 mA cathode current range, and adjustable output from 1.24V to 18V. Packaged in SOT-23-3 (DBZ) rated for -40C to +125C. Key Specifications VREF 1.24 […]<\/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-8754","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"Automotive 1.24V shunt ref, 0.5% accuracy, AEC-Q100, adj to 18V, SOT-23-3","date_code":"","package_case":"SOT-23-3 (2.92 x 1.30 x 0.95 mm)","in_stock":6780,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/atl431.pdf","price":"$0.22 @ 1ku","product_introduction":"The ATL431LIAQDBZRQ1 is a Texas Instruments AEC-Q100 Grade 0 qualified adjustable precision shunt voltage reference designed for automotive applications. The 1.24V internal reference allows regulation down to 2.7V in isolated flyback supplies with an optocoupler. The B grade provides 0.5% reference tolerance at 25C. The cathode current range spans 100 uA to 150 mA, with 0.15 ohm typical dynamic output impedance. The output voltage is adjustable from VREF to 18V using two external resistors. Grade 0 qualification supports junction temperatures up to 150C for under-hood automotive applications. The SOT-23-3 package minimizes board space in space-constrained automotive ECUs.","working_principle":"The ATL431 operates as a three-terminal shunt regulator identical to the TLVH431. The internal 1.24V bandgap reference, error amplifier, and open-collector output transistor form a feedback loop. When the REF pin voltage exceeds VREF, the cathode transistor conducts, sinking current to regulate the output. The output voltage is set by VO = VREF x (1 + R1\/R2) + IREF x R1. The AEC-Q100 qualification ensures the device meets automotive reliability requirements including extended temperature cycling, accelerated stress testing, and defect screening. The Grade 0 rating allows operation at junction temperatures up to 150C.","pin_description":"
      Pin<\/th>Mnemonic<\/th>Description<\/th><\/tr>
      1<\/td>REF<\/td>Reference input (1.24V threshold)<\/td><\/tr>
      2<\/td>ANODE<\/td>Anode (ground reference)<\/td><\/tr>
      3<\/td>CATHODE<\/td>Cathode (output)<\/td><\/tr><\/table>","application_scenarios":"
      • Automotive isolated flyback SMPS secondary-side error feedback with optocoupler<\/li>\n
      • Vehicle battery voltage monitoring and threshold detection<\/li>\n
      • On-board charger output voltage regulation with 0.5% accuracy<\/li>\n
      • Automotive LDO and DC-DC converter precision reference at 150C junction<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        TLVH431BIDBZR<\/td>TI<\/td>Non-automotive, same function<\/td><\/tr>
        ATL431LIAQDBVRQ1<\/td>TI<\/td>SOT-23-5 package with extra pins<\/td><\/tr>
        TL431BCDBZR<\/td>TI<\/td>2.495V ref, higher voltage<\/td><\/tr>
        NCP431<\/td>onsemi<\/td>Pin-compatible automotive<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/8754","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=8754"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/8754\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=8754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=8754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=8754"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=8754"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}