Part Number: MC78M12BDTRKG

Manufacturer: onsemi

Description: IC REG LINEAR 12V 500MA DPAK

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of MC78M12BDTRKG

Datasheet  MC78M12BDTRKG datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – Linear
Manufacturer ON Semiconductor
Packaging Digi-Reel?
Part Status Active
Regulator Topology Positive Fixed
Voltage – Output 12V
Current – Output 500mA
Voltage – Dropout (Typical) 2V @ 350mA
Number of Regulators 1
Voltage – Input Up to 35V
Current – Limit (Min)
Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount
Package / Case TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package DPAK-3

MC78M12BDTRKG Introduction

Voltage regulators are very important parts of computer circuits because they make sure that all the parts get the same stable voltage. They are needed for electronic gadgets to work correctly and keep their integrity. The MC78M12BDTRKG is one of these voltage regulators. It is part of the MC78M00/MC78M00A Series of positive voltage regulators.

The MC78M12BDTRKG is similar to the widely used MC7800 Series devices in many ways, but it is made differently: it is only rated for half the total current. This means it is meant to control voltage but has a lower maximum output current than its MC7800 peers. This function makes it easy to control the voltage on the card in situations where less current is needed.

By having a half-current output, the MC78M12BDTRKG is perfect for situations where less power is needed or where room is limited. It gives designers options for how to make their circuits work best, especially when accurate voltage regulation is needed at low power levels. Even though the MC78M12BDTRKG has a lower output current, it has the same performance and durability as the MC7800 devices. This makes sure that the voltage is always regulated correctly.

Overview of MC78M12BDTRKG

The MC78M12BDTRKG is a positive voltage regulator with three terminals. It is part of the MC78M00/MC78M00A Series. It has a small surface-mount package and is made to control power on the card itself. Let’s look at its most important features and specs:

  • How it looks and how the pins are set up: The MC78M12BDTRKG comes in a small surface-mount package, usually a TO-252 or DPAK box. It has three input/output pins: Vin, Vout, and GND, which are all connected to the same ground.
  • Voltage Regulation: The MC78M12BDTRKG is mainly made to control positive voltages, and it does this by giving a regulated +12-volt output voltage. It is able to keep the output voltage fixed even if the input voltage changes within a certain range.
  • Features that make it different: The MC78M12BDTRKG is different from other regulators because its output power is limited to half of what the MC7800 Series devices can do. This makes it a good choice for applications that need less current and where a smaller size or less power loss is wanted.

Key Specifications

  • Range of Input Voltage: The MC78M12BDTRKG usually works with input voltages between 14V and 35V. For the regulator to work right, the input voltage should be in this band.
  • Output Voltage: The regulator has a fixed output voltage of +12 volts, which gives the connected circuitry a steady and accurate voltage source.
  • Limit on Output Current: The MC78M12BDTRKG is designed to work with a maximum output current that is half of what the MC7800 Series devices can handle. To find out the exact current limit, you should look at the datasheet for the particular value.

Operating Principles

The MC78M12BDTRKG works in the same basic way that other linear voltage controllers do. It controls the output voltage with a mix of built-in electronics and feedback control. Here’s an explanation of how it works:

The voltage is controlled by the MC78M12BDTRKG, which has three terminals. There is a voltage reference, an error amplifier, and a pass transistor inside of the regulator. The voltage reference makes a stable reference voltage that can be used to compare the output voltage you want. The error amplifier checks the output voltage to the reference voltage all the time and sends out an error signal if there is a difference. This error signal tells the pass transistor how to change the output voltage so that it stays at the right amount.

Role of Each Terminal

  • Input (Vin): The uncontrolled input voltage goes into the input terminal. It is usually hooked up to a power source or a source of higher energy. For the MC78M12BDTRKG to work properly, the incoming voltage must be within the range given.
  • Output (Vout): The controlled output voltage is at the output terminal. It is connected to the load or circuitry that needs a steady source of voltage. The MC78M12BDTRKG makes sure that the output voltage stays the same, even if the input voltage changes or the load current changes.
  • Ground (GND): The regulator’s shared reference point is the ground terminal. It is linked to both the power source’s ground, or negative terminal, and the load circuitry. The ground terminal helps set the reference voltage and gives the current running through the regulator a way to go back to where it came from.

Protection Mechanisms

The MC78M12BDTRKG has several safety features to make sure it works safely and avoid damage to the device and the circuitry it is connected to. Some of these safety features are:

  • Overcurrent Protection: The regulator can limit the output current to a safe level, keeping too much current from flowing through the gadget and the load. This trait stops the current from getting too high and causing damage.
  • safety from overheating: The MC78M12BDTRKG may have built-in safety against overheating. If the temperature goes above a certain point, the regulator can either cut the output current or shut down temporarily to avoid thermal damage.

Recommended Operating Conditions

To make sure the MC78M12BDTRKG works well and is reliable:

  • Input Voltage: Work within the stated range of 14V to 35V for the input voltage.
  • Output Load: Don’t go over the highest output current limit, which is usually half of the value for devices in the MC7800 Series.
  • Heat Dissipation: Make sure there is enough heat dissipation, taking things like environmental temperature and power dissipation into account.
  • Capacitors on the input and output: Use the suggested capacitors to improve stability and reaction to sudden changes.

For stable voltage control and to keep the regulator from breaking, it is important to follow these rules. Changes in input voltage and output load can have an effect on performance, so it’s important to stay within the operating conditions stated by the manufacturer.


The MC78M12BDTRKG from the MC78M00/MC78M00A Series is a large half-current positive voltage regulator made for local voltage control. Compared to the MC7800 Series, it has more stable voltage regulation and less output power. For the best performance, you must follow the suggested operating conditions.  Don’t be afraid to get in touch with ICRFQ‘s skilled team if you need help or have questions. We’re here to give you tips and information to help you get the most out of the MC78M12BDTRKG.

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