Part Number: L78M05CDT-TR

Manufacturer: STMicroelectronics

Description: IC REG LINEAR 5V 500MA DPAK

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Technical Specifications of L78M05CDT-TR

Datasheet  L78M05CDT-TR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – Linear
Manufacturer STMicroelectronics
Packaging Tape & Reel (TR)
Part Status Active
Regulator Topology Positive Fixed
Voltage – Output 5V
Current – Output 500mA
Voltage – Dropout (Typical) 2V @ 350mA
Number of Regulators 1
Voltage – Input Up to 35V
Current – Limit (Min)
Operating Temperature 0°C ~ 150°C
Mounting Type Surface Mount
Package / Case TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package D-Pak

L78M05CDT-TR Introduction

A linear voltage regulator IC called the L78M05CDT-TR produces a steady and regulated output voltage of +5V, with a maximum output current of 500mA. This IC is frequently used in various electronic circuits, especially in power supply applications where a reliable and well-regulated power supply is necessary. The L78M05CDT-TR is made to function over a broad temperature range of -40°C to 125°C and accept a wide variety of input voltages, typically from 7V to 35V. It can be used in various applications, from consumer electronics to industrial control systems, because of its small size and robust DPAK packaging. This post will give a thorough overview of the L78M05CDT-TR, covering its features, specifications, and typical applications.

L78M05CDT-TR Description

Widely applicable in various applications, the L78M family of three-terminal positive regulators is offered in TO-220FP, TO-220, DPAK, and IPAK packages and with a number of set output voltages. These regulators can offer on-card local regulation, doing away with the distribution issues that come with single-point regulation. Internal current limiting, thermal shutdown and safe area protection are all used by each kind, making them virtually indestructible. With enough heat sinking, they can deliver more than 0.5 A of output current. Although their primary purpose is to act as fixed voltage regulators, these gadgets can be combined with outside elements to create adjustable voltages and currents.

L78M05CDT-TR Features

A linear voltage regulator with various crucial functions for controlling DC voltage is the L78M05CDT-TR IC. Its essential characteristics include:

  • The L78M05CDT-TR can accept input voltages between 7V and 35V DC. Input voltage range.
  • The IC offers a set output voltage of +5V DC as its output.
  • The L78M05CDT-TR can provide 500mA of output current at its maximum.
  • Thermal protection: The IC has a built-in thermal shutdown mechanism to prevent overheating.
  • In case of a short circuit, the L78M05CDT-TR has a built-in short-circuit protection mechanism that helps shield the IC from being harmed.
  • Low dropout voltage: The IC can adjust voltage even when the input voltage is marginally higher than the output voltage because of its extremely low dropout voltage.
  • Wide operating temperature range: The L78M05CDT-TR is appropriate for various applications because it can run at temperatures between -40°C and 125°C.
  • A linear voltage regulator with various characteristics to satisfy diverse power supply requirements is the L78M05CDT-TR IC. The main characteristics of this IC make it suited for low-power applications, including an output current of up to 0.5 A. The L78M05CDT-TR is extremely adaptable since it provides a broad range of output voltages, including 5, 6, 8, 9, 10, 12, and 24 V.
  • A further feature of the IC is thermal overload protection, which guarantees that the gadget will switch off if the temperature rises over safe levels. The L78M05CDT-TR also has short circuit protection, which shields the integrated circuit (IC) from harm in the event of a short circuit.
  • Output transition SOA protection is another feature of the L78M05CDT-TR. As a result, the device is guaranteed to handle the load current during the change from the linear region to the saturation region.
  • The output voltage tolerance for the AB, AC, and C variants is 2%, 4%, and 6%, respectively, offering users precise and reliable output voltages. The device is suited for applications where the temperature fluctuates since it can operate over a wide temperature range.

Because of these characteristics, the L78M05CDT-TR is a great option for various electrical devices, including power supplies, voltage regulators, and other applications that call for a set output voltage.

L78M05CDT-TR Design considerations

The fixed voltage regulators in the L78M series are equipped with internal short-circuit protection, output transistor safe-area compensation, and thermal overload protection, which shuts down the circuit if it is subjected to an extreme power overload condition.

It also has internal short-circuit protection that caps the maximum current the circuit will pass. The consensus is that compensation capacitors are unnecessary in many low-current applications.

The regulator input should, however, be bypassed with a capacitor if it is linked to the power supply filter through lengthy wires or if the output load capacitance is high. To provide stable functioning under all load situations, an input bypass capacitor should be used to have strong high-frequency characteristics.

Choosing a mylar, tantalum, or another capacitor with an internal impedance low at high frequencies and 0.33 F or bigger is best. Directly across the input terminals of the regulator, the bypass capacitor should be fitted with the shortest possible leads. Since the regulator doesn’t have an external sense lead, proper construction methods should typically be used to reduce ground loops and lead resistance drops.

L78M05CDT-TR Advantages

  • Simple to use: The L78M05CDT-TR has a set output voltage and is a very straightforward device, making it simple to operate and include in various applications.
  • Low output noise: Linear voltage regulators, like the L78M05CDT-TR, have extremely low output noise compared to other voltage regulators, making them suited for delicate applications like audio circuits.
  • Low cost: Compared to other voltage regulator types, such as switching regulators, linear voltage regulators are typically less expensive.
  • The L78M05CDT-TR is ideal for low-power applications because it is built for them, making it a good option for those where power consumption is a key factor.

L78M05CDT-TR Disadvantages

  • Low efficiency: The efficiency of linear voltage regulators is normally between 60 and 70%, which is lower than that of other regulators.
  • Limited input voltage range: The L78M05CDT-TR is inappropriate for applications requiring higher input voltages due to its limited input voltage range of 7V to 35V.
  • Thermal dissipation: In high-power applications where thermal management is important, linear regulators like the L78M05CDT-TR can be problematic since they lose much power as heat.
  • Limited output current: The L78M05CDT-TR’s 500mA maximum output current makes it unsuitable for high-current applications.

In conclusion, the L78M05CDT-TR is a solid option for low-power applications where simplicity and low noise are critical. Still, its low efficiency and constrained output current may not be ideal for high-power applications.


To sum up, the L78M05CDT-TR is a popular linear voltage regulator IC featuring different output voltages, short-circuit protection, and thermal overload protection. Its main benefit is its capacity to deliver an output voltage consistent and dependable with little noise and ripple, making it the perfect option for powering delicate electronic circuits. Meanwhile, its low efficiency is a drawback that can be overcome by switching to more effective regulators.

Despite this restriction, the L78M05CDT-TR is still a dependable and adaptable part that can be used in various applications, including consumer electronics, transportation, and industry. We may anticipate those linear voltage regulators will continue to perform and operate more efficiently as technology develops.

If you’re looking for the L78M05CDT-TR IC, ICRFQ offers a huge selection of affordable electronic parts, and our staff is always happy to help you with any questions or requests. For outstanding performance in your industrial applications, get the L78M05CDT-TR.

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