{"id":7866,"date":"2026-06-28T03:00:56","date_gmt":"2026-06-28T03:00:56","guid":{"rendered":"https:\/\/materialparts.com\/l78l08acz\/"},"modified":"2026-06-28T11:40:05","modified_gmt":"2026-06-28T11:40:05","slug":"l78l08acz","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/l78l08acz\/","title":{"rendered":"L78L08ACZ"},"content":{"rendered":"

Productos<\/h2>\n

The L78L08ACZ is a 100mA positive voltage regulator from STMicroelectronics providing fixed 8V output with thermal shutdown and short-circuit protection in a TO-92 through-hole package.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n8V fixed (\u00b12% at 25\u00b0C, A-grade)<\/td>\n<\/tr>\n
Corriente de salida<\/td>\n100mA (with adequate heatsinking)<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n10.5V to 30V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.7V typical at 100mA<\/td>\n<\/tr>\n
Line Regulation<\/td>\n20mV typical<\/td>\n<\/tr>\n
Load Regulation<\/td>\n5mV typical (1mA to 100mA)<\/td>\n<\/tr>\n
Corriente de reposo<\/td>\n3mA typical<\/td>\n<\/tr>\n
Ripple Rejection<\/td>\n45dB typical at 120Hz<\/td>\n<\/tr>\n
Thermal Shutdown<\/td>\n150\u00b0C typical<\/td>\n<\/tr>\n
Short-Circuit Current<\/td>\n200mA typical<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +125\u00b0C (A-grade)<\/td>\n<\/tr>\n
Paquete<\/td>\nTO-92 (3-pin through-hole)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Fixed 8V output with \u00b12% tolerance (A-grade)<\/li>\n
  • 100mA output current capability<\/li>\n
  • Internal thermal overload protection<\/li>\n
  • Internal short-circuit current limiting<\/li>\n
  • Output transistor safe-area compensation<\/li>\n
  • No external components required for basic operation<\/li>\n
  • TO-92 package for through-hole and prototyping<\/li>\n
  • Direct replacement for 78L08 and LM78L08<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Local 8V regulation in analog circuits<\/li>\n
    • Op-amp and comparator power supply<\/li>\n
    • Instrumentation and measurement<\/li>\n
    • Relay and solenoid driver supply<\/li>\n
    • Low-power logic power<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The L78L08ACZ is a 100mA positive voltage regulator from STMicroelectronics providing fixed 8V output with thermal shutdown and short-circuit protection in a TO-92 through-hole package. Key Specifications Output Voltage 8V fixed (\u00b12% at 25\u00b0C, A-grade) Output Current 100mA (with adequate heatsinking) Input Voltage Range 10.5V to 30V Dropout Voltage 1.7V typical at 100mA […]<\/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":[142],"class_list":["post-7866","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-st"],"acf":{"brief_explanation":"100mA fixed 8V positive regulator, 10.5-30V input, TO-92, A-grade \u00b12%","date_code":"","package_case":"TO-92 (5.21 x 4.19 x 5.34mm, 3-pin through-hole)","in_stock":8300,"datasheet":"https:\/\/www.st.com\/resource\/en\/datasheet\/l78l.pdf","price":"$0.35 @ 1ku","product_introduction":"The L78L08ACZ is a 100mA positive linear voltage regulator from STMicroelectronics providing a fixed 8V output in a TO-92 through-hole package. The A-grade offers \u00b12% output voltage tolerance at 25\u00b0C over the -40\u00b0C to +125\u00b0C industrial temperature range. It requires only input and output bypass capacitors for operation. Internal protection includes thermal shutdown at 150\u00b0C and short-circuit current limiting at approximately 200mA. The 8V output is commonly used for dual-supply op-amp circuits (\u00b18V) and specialized analog applications. The TO-92 package is ideal for low-power applications and prototyping.","working_principle":"The L78L08ACZ uses a series pass transistor controlled by an error amplifier that compares a fraction of the output voltage (via an internal resistor divider set for 8V) with an internal bandgap reference. The error amplifier drives the base of the NPN pass transistor to maintain the output at 8V. The series pass element dissipates (VIN - VOUT) \u00d7 ILOAD as heat, requiring adequate PCB copper or heatsinking at higher input-output differentials. The thermal shutdown circuit monitors junction temperature and turns off the pass transistor at approximately 150\u00b0C. The current-limiting circuit senses output current and reduces the drive when it exceeds approximately 200mA. Safe area protection reduces the current limit as the input-output voltage differential increases. The 45dB ripple rejection at 120Hz suppresses input ripple by a factor of approximately 178:1. The 3mA quiescent current flows through the internal bias network and is delivered to the output rather than wasted.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>OUTPUT<\/td>Power Output<\/td>Regulated 8V DC output at up to 100mA continuous current with \u00b14% A-grade tolerance (\u00b12% available in premium grades). Minimum load current is not required for stability. Output noise is typically 60\u00b5Vrms (10Hz-100kHz bandwidth). Bypass with 0.01\u00b5F ceramic capacitor to improve transient response.<\/td><\/tr>\n
      2<\/td>GND<\/td>Ground<\/td>Common ground reference. In TO-92 package, the center pin and the tab are both GND. This pin serves as both electrical ground and the primary thermal path to the PCB. For best thermal performance, connect to large copper pour on PCB.<\/td><\/tr>\n
      3<\/td>INPUT<\/td>Power Input<\/td>Unregulated input voltage ranging from 10.5V to 30V (minimum input = Vout + Vdropout \u2248 10.5V). Dropout voltage is 1.7V typical at 40mA output current. Bypass with 0.33\u00b5F ceramic capacitor to GND when input supply is more than 4 inches from the regulator.<\/td><\/tr>\n<\/table>\n

      L78L08ACZ pin assignment (TO-92-3, flat face toward you, pins down): Pin 1 (left) = OUTPUT, Pin 2 (center) = GND, Pin 3 (right) = INPUT. WARNING: 78Lxx has OUTPUT on Pin 1 and INPUT on Pin 3, which is OPPOSITE to the larger 78xx TO-220 where Input is Pin 1. This is a common source of design errors. Always verify pinout against the specific datasheet before PCB layout. The A suffix denotes \u00b14% tolerance; C suffix = \u00b18%.<\/p>","application_scenarios":"

        \n
      • Op-Amp Supply:<\/strong> 8V output suitable for single-supply op-amp circuits and dual \u00b18V analog rails<\/li>\n
      • Instrumentation:<\/strong> \u00b12% accuracy and low output noise provide stable reference for measurement circuits<\/li>\n
      • Relay Drivers:<\/strong> 100mA output directly drives 8V relay coils with short-circuit protection<\/li>\n
      • Local Regulation:<\/strong> TO-92 package allows point-of-load regulation near sensitive analog circuits<\/li>\n
      • Prototyping:<\/strong> 3-pin through-hole package and zero external components simplify breadboard circuits<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM78L08ACZ<\/td>TI<\/td>TI equivalent 8V\/100mA positive regulator in TO-92 with \u00b14% tolerance for low-power rails<\/td>TO-92-3<\/td>8V\/100mA<\/td><\/tr>\n
        MC78L08ACDR2G<\/td>onsemi<\/td>Surface-mount SOIC-8 version of 8V\/100mA regulator for compact PCB assembly<\/td>SOIC-8<\/td>8V\/100mA<\/td><\/tr>\n
        LM7808CT<\/td>onsemi<\/td>1A full-current version in TO-220 for applications requiring more than 100mA output<\/td>TO-220-3<\/td>8V\/1A<\/td><\/tr>\n
        LM317LZ<\/td>TI<\/td>Adjustable 1.25-37V\/100mA version in TO-92 for custom output voltage low-power rails<\/td>TO-92-3<\/td>1.25-37V\/100mA<\/td><\/tr>\n
        TLV70033DDCR<\/td>TI<\/td>3.3V\/300mA modern LDO in SOT-23-5 with 200mV dropout for battery-powered designs<\/td>SOT-23-5<\/td>3.3V\/300mA<\/td><\/tr>\n<\/table>\n

        L78L08ACZ is an 8V\/100mA fixed positive voltage regulator in TO-92-3 with \u00b14% A-grade tolerance. It is the low-power version of the 7808, ideal for reference and bias supply rails. For surface-mount, MC78L08ACDR2G (SOIC-8) provides identical functionality. For adjustable output at 100mA, LM317LZ offers 1.25-37V range in the same TO-92-3 package.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7866","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=7866"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7866\/revisions"}],"predecessor-version":[{"id":8273,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7866\/revisions\/8273"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7866"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}