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AS78L12RTR-G1

12V 100mA positive voltage regulator, SOT-89, thermal/short-circuit protection

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Manufacturer Part：

AS78L12RTR-G1

Package：

SOT-89 (4.50 x 2.50 x 1.50 mm)

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Description

Product Overview

The AS78L12RTR-G1 from Diodes Incorporated (BCR) is a positive voltage regulator providing 12V output at up to 100mA in a SOT-89 package. A low-cost, low-dropout alternative to the 78L12 series, it is suitable for low-power analog and relay supply rails.

Key Specifications

Output Voltage 12 V
Output Current 100 mA (max)
Dropout Voltage 1.7 V (typ)
Input Voltage Range 14.8 V to 30 V
Line Regulation 30 mV (typ)
Load Regulation 60 mV (typ)
Operating Temperature -40C to +125C

Features

  • Fixed 12V output with 100mA current capability
  • Internal thermal shutdown and short-circuit protection
  • Low quiescent current of 4mA typical
  • SOT-89 package for compact layout

Applications

  • 12V analog and relay supply rails
  • Low-power auxiliary voltage regulation
  • Industrial control system supply
  • Post-regulation for switch-mode supplies

The AS78L12RTR-G1 from Diodes Incorporated is a fixed 12V positive voltage regulator capable of delivering up to 100mA output current in a SOT-89 package. The device requires only external input and output capacitors for stable operation. It features internal thermal shutdown and short-circuit current limiting for reliable operation. Typical dropout voltage is 1.7V, requiring a minimum input voltage of 14.8V. The low quiescent current of 4mA typical minimizes power dissipation. The device is pin-compatible with industry-standard 78L12 regulators in SOT-89 package.

The AS78L12RTR-G1 uses a series-pass regulator topology. (1) Reference: An internal bandgap voltage reference provides a stable 1.25V reference. (2) Error Amplifier: The error amplifier compares a divided-down version of the output voltage to the reference and drives the series-pass transistor to maintain 12V at the output. (3) Pass Transistor: A Darlington NPN series-pass transistor regulates output voltage by dropping excess voltage between input and output. (4) Protection: Thermal shutdown activates at approximately 150C junction temperature, disabling the pass transistor. Short-circuit current limiting restricts output current to approximately 200mA under fault conditions. (5) Bypass Capacitors: A 0.33uF input capacitor prevents oscillation with high source impedance. A 0.1uF output capacitor improves transient response.

Pin Name Type Function
1 GND Ground Ground reference
2 VOUT Output 12V regulated output
3 VIN Input Unregulated input (14.8-30V)
  • 12V analog and relay supply rails in industrial control systems
  • Low-power auxiliary voltage regulation from 24V industrial supply
  • Post-regulation for switch-mode supplies to reduce output noise
  • General-purpose 12V bias supply with thermal and short-circuit protection
Manufacturer Part Number Package Notes
onsemi MC78L12ABDR2G SOIC-8 12V 100mA LDO
ST L78L12ACZ-AP TO-92 Through-hole version
TI UA78L12ACLP TO-92 12V 100mA, TI brand
Diodes Inc AS78L05RTR-G1 SOT-89 5V version
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Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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