STMicroelectronics L78L Series Fixed 12V 100mA Linear Voltage Regulator SOT-89-

The STMicroelectronics L78L Series is a 3-terminal positive linear voltage regulator designed for reliable, fixed-voltage power regulation. Employing advanced internal current limiting and thermal shutdown protection, this device is engineered to be exceptionally robust, providing dependable performance in a wide array of electronic applications.

When paired with an adequate heat sink, it can deliver a steady output current of up to 100mA. Its primary function is to serve as a local or on-card voltage regulator, effectively eliminating noise and mitigating power distribution issues commonly associated with single-point regulation systems. This makes it an excellent choice for cleaning up power supplies to sensitive components.

Beyond standard regulation, this versatile IC can be utilised alongside external power pass elements to construct high-current voltage regulator circuits, offering design flexibility. It also serves as a superior, drop-in replacement for traditional Zener diode and resistor combinations, delivering the added benefits of significantly lower quiescent current and reduced output noise.

A key advantage is its simplicity of use; no external components are required for basic operation, streamlining your circuit design and reducing board space. The integrated short-circuit protection further enhances system reliability, safeguarding both the regulator and the downstream circuitry.

Key Specifications & Features:

• Output Type: Fixed voltage
• Nominal Output Voltage: 12V
• Maximum Output Current: 100mA
• Maximum Input Voltage: 35V
• Protection Features: Internal current limiting, thermal shutdown, and short-circuit protection
• Mounting Style: Surface Mount (SMD)
• Package: SOT-89-3
• Operating Temperature Range: 0°C to +125°C
• Key Benefit: Functions as a low-noise, low-quiescent-current Zener