ON SEMICONDUCTOR - LM7812CT - LINEAR VOLTAGE REGULATOR, 12V, TO-220-3
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Aug 11, 2021
Lennon Dan
LM7812 Voltage Regulator Tutorial
ON SEMICONDUCTOR - LM7812CT - LINEAR VOLTAGE REGULATOR, 12V, TO-220-3
Hello, everyone, welcome to the new post today. I am Rose. Today we will discuss the LM7812 Positive Voltage Regulators. This article mainly introduce specifications, pinout, datasheet and other detailed information about On Semiconductor LM7812.
LM7812CT
LM7812 is a TO-220 packaged positive voltage regulator IC of LM78xx series that is manufactured by many different electronic components manufacturers. It has synchronous rectification features as well as a wide frequency response and it is ease-of-use and available in very low cost.
The IC provides fixed 12V output voltage no matter if the input voltage is fluctuating or changing continuously or it is higher than 12V but the input voltage should not be more than 35V which is the maximum input voltage limit this IC is capable to handle.
Moreover the input voltage should not be less than 14V that is the minimum input voltage requirement of the IC to provide fixed 12V output. Although this IC is designed for fixed output but the output can also be adjusted if required by the user with the help of only two external resistors at the output
During usage when the IC performing voltage regulation or stepping down the input voltage all the voltage difference between the input voltage and the output is converted to heat due to which a suitable heatsink is mandatory for proper working of the IC. The IC can handle maximum load of 1A to 1.5A but the input current should be 2A to get 1A to 1.5A at the output.
LM7812 has three pins. The first one Input is Postive Input Voltage, the second one GND connect to the ground and the last one Output is Postive Output Voltage. The pin diagram is shown bellow.
Symbol
Footprint
3D Model
●Input Voltage Range: 14V to 35V
●Output Voltage Range: 11.75V - 12.25V DC
●Output Current (Typical): 1A
●Peak current: 2.2A
●Dropout voltage: 2V
●Available in TO-252, TO-220 & TO-263 Package
●The Output current is 1.5 Ampere
●12V fixed and acurate output voltage
●Immediate short circuit shutdown function
●Immediate over heat shutdown function
●Low price
●Authentic to use in commercial devices
●Low standby current only 8mA
●Fixed voltage linear regulator78xx Pin-out
●Output Voltage Tolerance of 5%
●Internal thermal overload protection
●Internal Short-Circuit Limited
●No External Component
1. Does not require any component to balance or saturate their output voltage.
2. It has a built-in protection from the high current.
3. It has a heat-sink with the common ground connected with it. The heat sink prevents our regulator IC from overheating and short-circuits.
ON Semiconductor LM7812CT technical specifications, attributes, parameters and parts with similar specifications to ON Semiconductor LM7812CT.
ON Semiconductor LM7812CT technical specifications, attributes, parameters and parts with similar specifications to ON Semiconductor LM7812CT.
| Product Attribute | Attribute Value | |
|---|---|---|
| Contact Plating | Tin | |
| Mount | Through Hole | |
| Mounting Type | Through Hole | |
| Package / Case | TO-220-3 | |
| Number of Pins | 3Pins | |
| Weight | 1.214g | |
| Operating Temperature | -40°C~125°C | |
| Packaging | Tube | |
| Published | 2014 | |
| JESD-609 Code | e3 | |
| Pbfree Code | yes | |
| Part Status | Obsolete | |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Number of Terminations | 3Terminations | |
| ECCN Code | EAR99 | |
| Packing Method | RAIL | |
| Terminal Position | SINGLE |
| Product Attribute | Attribute Value | |
|---|---|---|
| Number of Functions | 1Function | |
| Terminal Pitch | 2.54mm | |
| Base Part Number | LM7812 | |
| Number of Outputs | 1Output | |
| Voltage - Input (Max) | 35V | |
| Output Voltage | 12V | |
| Output Type | Fixed | |
| Max Output Current | 1A | |
| Max Supply Voltage | 35V | |
| Nominal Supply Current | 5.1mA | |
| Output Configuration | Positive | |
| Quiescent Current | 8mA | |
| Accuracy | 4 % | |
| Output Voltage 1 | 12V | |
| Number of Regulators | 1Regulator | |
| Min Input Voltage | 14.5V | |
| Protection Features | Over Temperature, Short Circuit |
| Product Attribute | Attribute Value | |
|---|---|---|
| Voltage Dropout (Max) | 2V @ 1A Typ | |
| PSRR | 71dB (120Hz) | |
| Dropout Voltage | 2V | |
| Dropout Voltage1-Nom | 2V | |
| Min Output Voltage | 12V | |
| Power Supply Rejection Ratio (PSRR) | 71dB | |
| Voltage Tolerance-Max | 5% | |
| Nominal Output Voltage | 12V | |
| Output Voltage Accuracy | 4 % | |
| Height | 20.4mm | |
| Length | 10.16mm | |
| Width | 4.7mm | |
| REACH SVHC | No SVHC | |
| Radiation Hardening | No | |
| RoHS Status | RoHS Compliant | |
| Lead Free | Lead Free |
The LM7812 IC have 3 pins. The pin 1 is positive input. The pin 2 is common between both input as well as output voltage. The pin 3 is positive output.
When using the voltage regulator setup, you need to take care of the current through the voltage regulator ic do not exceed beyond the capacity which is mentioned in the datasheet or else it may blow off.
You also have to be careful with the connection you are making with the voltage supply. Reverse polarity does get the ic heat up really quickly, you can also use a pn junction diode in order to prevent such a condition.
You can use the capacitors in order to minimize the voltage fluctuations in the circuit and maintains the constant voltage across the input as well as output of the circuit.
1.Remote control cars
2.Toys
3.Phone and battery chargers
4.Power distribution circuits
5.Current Limiter for certain applications
6.Regulated Dual Supply
7.Voltage step down circuits
8.12V Power Supplies
9.Motor Drivers
10.Solar Power Supplies
11.Microcontroller Related Applications
12.Electronic communications, motors, LEDs, flashlights, load switches, DC fans and many others.
13.Independent voltage regulator of high supply voltage of electric motors.
14.AC motor controllers.
15.Electronic security and fire alarms
ON Semiconductor is a semiconductor supplier company, products include power and signal management, logic, discrete, and custom devices for automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power applications. ON Semiconductor runs a network of manufacturing facilities, sales offices and design centers in North America, Europe, and the Asia Pacific regions. Its Headquarter is in Phoenix, Arizona.
Download datasheets and manufacturer documentation for ON Semiconductor LM7812CT.
Download datasheets and manufacturer documentation for LM7812CT
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