{"id":6641,"date":"2026-06-18T15:53:47","date_gmt":"2026-06-18T15:53:47","guid":{"rendered":"https:\/\/materialparts.com\/lm337t\/"},"modified":"2026-06-18T15:53:47","modified_gmt":"2026-06-18T15:53:47","slug":"lm337t","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm337t\/","title":{"rendered":"LM337T"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The LM337T from Texas Instruments is a 1.5A adjustable negative voltage regulator, the complement to the LM317T positive regulator. Output voltage is adjustable from -1.2V to -37V using two external resistors. Packaged in TO-220.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
\u062c\u0647\u062f \u0627\u0644\u062e\u0631\u062c<\/td>\n-1.2V to -37V (adjustable)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n1.5A<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n-4.2V to -40V<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u062a\u0633\u0631\u0628<\/td>\n3V (typ at 1A)<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.01%\/V (typ)<\/td>\n<\/tr>\n
Load Regulation<\/td>\n0.3%\/A (typ)<\/td>\n<\/tr>\n
Ripple Rejection<\/td>\n77dB (typ)<\/td>\n<\/tr>\n
Reference Voltage<\/td>\n-1.25V (ADJ to VOUT)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nTO-220<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n0 to +125 C<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Negative output adjustable from -1.2V to -37V<\/li>\n
  • 1.5A output current<\/li>\n
  • Complement to LM317T for dual supplies<\/li>\n
  • Internal thermal and current limiting<\/li>\n
  • 77dB ripple rejection<\/li>\n
  • Only 2 resistors to set output voltage<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Dual +\/-15V op-amp power supplies (with LM317T)<\/li>\n
    • Negative voltage regulation for analog circuits<\/li>\n
    • Laboratory adjustable negative supply<\/li>\n
    • Audio amplifier negative rail<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM337T from Texas Instruments is a 1.5A adjustable negative voltage regulator, the complement to the LM317T positive regulator. Output voltage is adjustable from -1.2V to -37V using two external resistors. Packaged in TO-220. Key Specifications Output Voltage -1.2V to -37V (adjustable) Output Current 1.5A Input Voltage -4.2V to -40V Dropout Voltage 3V […]<\/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":[13,32],"tags":[],"chip_brand":[],"class_list":["post-6641","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo"],"acf":{"brief_explanation":"Adjustable negative voltage regulator, -1.2 to -37V, 1.5A, TO-220","date_code":"","package_case":"TO-220","in_stock":11845,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm337.pdf","price":"$0.60 @ 1ku","product_introduction":"The LM337T from Texas Instruments is the negative-output complement to the LM317T adjustable positive regulator. It provides an adjustable output voltage from -1.2V to -37V at up to 1.5A, set by just two external resistors. Combined with an LM317T, it creates a complete dual-tracking or independent +\/- adjustable power supply for op-amps, audio circuits, and analog systems. The LM337T uses the same adjustment mechanism as the LM317T: the output voltage is VOUT = -1.25V x (1 + R2\/R1) + IADJ x R2, where IADJ is approximately 50uA. The 77dB ripple rejection ensures clean negative rails for sensitive analog circuits. Internal protection includes thermal shutdown and current limiting. The TO-220 package tab is connected to the adjustment pin (not to the output), requiring an insulating washer when mounted to a heatsink at a different potential.","working_principle":"The LM337T maintains -1.25V between the ADJ (adjust) pin and the VOUT (output) pin. The output voltage is set by a resistor divider from VOUT to ADJ to GND: R1 between VOUT and ADJ (typically 120 Ohm), and R2 between ADJ and ground. The current through R1 is I = 1.25V\/R1 = 1.25\/120 = 10.4mA, which is well above the ADJ pin bias current of 50uA, ensuring the divider dominates the output voltage. The output voltage is VOUT = -(1.25V x (1 + R2\/R1) + IADJ x R2). For a -15V output: R2 = (15\/1.25 - 1) x 120 = 7 x 120 = 840 Ohm (use 845 Ohm standard). The 3V dropout means the input must be at least 3V more negative than the output (e.g., -18V input for -15V output at 1A). The thermal protection disables the output when the junction exceeds 125C.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>ADJ<\/td>Adjustment terminal (connected to R1\/R2 divider)<\/td><\/tr>
      2<\/td>VOUT<\/td>Negative regulated output<\/td><\/tr>
      3<\/td>VIN<\/td>Negative unregulated input (-4.2 to -40V)<\/td><\/tr><\/table>","application_scenarios":"
      • Dual +\/-15V power supply using LM317T (+) and LM337T (-) for op-amp circuits<\/li>\n
      • Adjustable negative rail from -1.2V to -37V for analog and audio circuits<\/li>\n
      • Audio amplifier symmetric power supply with 77dB ripple rejection<\/li>\n
      • Laboratory bench supply with LM317T\/LM337T dual tracking regulators<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        LM317T<\/td>TI<\/td>Positive adjustable (+1.2 to +37V), complement<\/td><\/tr>
        LM337MP<\/td>TI<\/td>SOT-223 surface mount version<\/td><\/tr>
        LM7905CT<\/td>TI<\/td>Fixed -5V output version<\/td><\/tr>
        LM7912CT<\/td>TI<\/td>Fixed -12V output version<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6641","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=6641"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6641\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6641"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6641"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}