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78L05 Voltage Regulator: PDF, Pinout, Datasheet

Author: Iggy Date: 19 Apr 2021  897

The 78L05 is a three terminal integrated regulator.

Its excellent internal current limit and thermal shutdown characteristics make it particularly suitable for overload conditions. When used to replace the traditional Zener diode-resistor group, its output impedance is effectively improved, but the bias current is greatly reduced.

78L05 is suitable for many applications. They can be combined with other power transfer devices to form a high-current regulated power supply, such as a voltage regulator that can drive an output current of up to 100 mA.

Catalog

78L05 Pinout

78L05 Features

78L05 Applications

78L05 Advantage

78L05 Equivalents

78L05 Alternative

Where to use 78L05

How to test 78L05

How to use 78L05

78L05 Package

Component Datasheet


78L05 Pinout

78L05 Voltage Regulator Pinout

Pin No.

Pin Name

Description

1

Output (Vo)

Outputs Regulated +5V

2

Ground (Gnd)

Connected to Ground

3

Input (V+)

Unregulated Input Voltage


78L05 Features

  • Operating current(IQ) is 5mA
  • Internal Thermal Overload and Short circuit current limiting protection is available.
  • The maximum input voltage is 30 volts.
  • TO-92, SO-8, and SOT-89 packages are available.
  • Positive Voltage Regulator 5V
  • Maximum output current is 100mA.

Note: Complete Technical Details can be found at the 78L05 datasheet given at the end of this page.


78L05 Applications

  • Adjustable Output Regulator
  • Constant +5V output regulator to power small loads of less than 100mA
  • Output Polarity-Reversal-Protection Circuit
  • Output booster circuit
  • Current Limiter for certain applications

78L05 Advantage

78L05 Voltage Regulator

78L05 Voltage Regulator

78L05 is a fixed voltage (5V) three terminal integrated regulator, which can be applied to many applications. Its excellent internal current and thermal shutdown characteristics make it especially suitable for overload. When it is used to replace the traditional zener diode - resistance group, its output impedance is improved effectively, but the bias current is greatly reduced. In another words,78L05 series (like L78L05ACD013TR) is a fixed voltage (5V) three terminal integrated voltage regulator, which is suitable for many applications. Like a single point voltage regulator which needs to limit the noise and solve the distribution problem, it can also be used with other power transfer devices to form a stable voltage power supply with large current, such as a stable output current of up to 100 mA.


78L05 Equivalents

LM7805, AMS7111


78L05 Alternative

LM317,LM7806, LM7809, LM7905, LM117V33, LM7812, LM7912, XC6206P332MR.


Where to use 78L05

Voltage regulators are frequently used in electronic circuits. They produce a constant output voltage in response to a variable input voltage. In our case, the 78L05 IC is a well-known regulator IC that is used in a wide range of projects. The name 78L05 has two meanings: "78" indicates that it is a positive voltage regulator, and "05" indicates that it outputs 5V. As a result, our 7805 will produce a +5V output voltage.

This IC's output current can reach 100mA. However, the IC suffers from significant heat loss, so a heat sink is recommended for projects that require a higher current consumption. For example, if the input voltage is 12V and the current consumption is 50mA, (12-5) * (50*10-3) = 0.35W. This 0.35 Watts will be dissipated in the form of heat.

Another popular voltage regulator is the 7805, which is larger but has a higher current rating of about 1A. So, if you're looking for a smaller package of a voltage regulator with a low current rating in a TO-92 package, this IC might be a good fit.


How to test 78L05

All you need to do is take the positive probe off the input pin and place it on the output pin. You can leave the negative probe on the ground pin. The amount of output voltage indicated should be 5 volts because of the “05” associated with 78L05.

How to use 78L05

The 78L05 is a voltage regulator with three terminals. As shown in the 78L05 pinout diagram, the three terminals are Input, Output, and Ground. It is very simple to use this IC; simply connect the input pin to the input voltage that needs to be regulated and the ground pin to system ground. The IC's output pin can be used to obtain regulated 5V.

The 78L05 is used in the circuit below to regulate a 12V input voltage to 5V. You use the 5V to power any small loads that draw less than 100mA, such as LEDs. Because the maximum current that this IC can provide is only 100mA.

How to use 78L05

It is also worth noting that the capacitors C1 and C2 are used at both the input and output ends. These capacitors filter any noise that is coupled with the input voltage. It is not necessary to use the exact value of the capacitor, but 10uF for C1 and 1uF for C2 would be a good starting point.

These regulators can also limit current and protect when the temperature rises above the junction temperature. If you connect high current loads, you can expect the IC to get very hot and eventually shunt down. In this case, a high current regulator such as the 7805 would be an excellent choice.

It can be used as a voltage regulator, a current regulator, a short-circuit protector, a booster circuit, and even a variable voltage regulator in addition to a voltage regulator. All of these circuits can be found on page 27/45 of the 78L05 datasheet, which is linked below.


78L05 Package

78L05 Package


Component Datasheet

78L05 Datasheet


Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
L78L05ABD13TR L78L05ABD13TR Company:STMicroelectronics Remark:IC REG LINEAR 5V 100MA 8SO Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:22500
Inquiry
Price:
2500+: $0.10638
5000+: $0.10047
12500+: $0.09160
25000+: $0.08570
62500+: $0.07683
125000+: $0.07388
Inquiry
L78L05ABUTR L78L05ABUTR Company:STMicroelectronics Remark:IC REG LINEAR 5V 100MA SOT89-3 Package:TO-243AA
DataSheet
In Stock:85000
Inquiry
Price:
2500+: $0.13470
5000+: $0.12601
12500+: $0.11558
25000+: $0.11123
62500+: $0.10862
125000+: $0.10428
Inquiry
L78L05ABZ L78L05ABZ Company:STMicroelectronics Remark:Linear Voltage Regulators 5.0V 0.1A Positive Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
1+: $0.41000
10+: $0.30000
100+: $0.15300
1000+: $0.11500
2500+: $0.10100
10000+: $0.09300
25000+: $0.08900
50000+: $0.08700
100000+: $0.08600
Inquiry
L78L05ABZ-TR L78L05ABZ-TR Company:STMicroelectronics Remark:IC REG LINEAR 5V 100MA TO92-3 Package:TO-226-3, TO-92-3 (TO-226AA)
DataSheet
In Stock:6000
Inquiry
Price:
2000+: $0.09300
6000+: $0.08700
10000+: $0.07980
50000+: $0.07500
100000+: $0.07380
200000+: $0.07200
Inquiry
L78L05ACD13TR L78L05ACD13TR Company:STMicroelectronics Remark:IC REG LINEAR 5V 100MA 8SO Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:20000
Inquiry
Price:
2500+: $0.10692
5000+: $0.10098
12500+: $0.09207
25000+: $0.08613
62500+: $0.07722
125000+: $0.07425
Inquiry
L78L05ACUTR L78L05ACUTR Company:STMicroelectronics Remark:IC REG LINEAR 5V 100MA SOT89-3 Package:TO-243AA
DataSheet
In Stock:30000
Inquiry
Price:
2500+: $0.13470
5000+: $0.12601
12500+: $0.11558
25000+: $0.11123
62500+: $0.10862
125000+: $0.10428
Inquiry
L78L05ACZ L78L05ACZ Company:STMicroelectronics Remark:Linear Voltage Regulators 5.0V 0.1A Positive Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
1+: $0.38000
10+: $0.27900
100+: $0.14200
1000+: $0.10700
2500+: $0.09400
10000+: $0.08600
25000+: $0.08300
50000+: $0.08100
100000+: $0.07900
Inquiry
L78L05ACZ-AP L78L05ACZ-AP Company:STMicroelectronics Remark:IC REG LINEAR 5V 100MA TO92-3 Package:TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
DataSheet
In Stock:8000
Inquiry
Price:
2000+: $0.10230
6000+: $0.09570
10000+: $0.08778
50000+: $0.08250
100000+: $0.08118
200000+: $0.07920
Inquiry
LM78L05ACM LM78L05ACM Company:Texas Instruments Remark:IC REG LINEAR 5V 100MA 8SOIC Package:SOP-8
DataSheet
In Stock:7626
Inquiry
Price:
1+: $0.92000
10+: $8.23000
25+: $19.53000
100+: $59.99000
250+: $132.53000
500+: $251.10000
1000+: $390.60000
2500+: $927.68000
5000+: $1785.60000
Inquiry
LM78L05ACMX-NOPB LM78L05ACMX-NOPB Company:Texas Instruments Remark:IC REG LINEAR 5V 100MA 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:125000
Inquiry
Price:
2500+: $0.24030
5000+: $0.23140
12500+: $0.22250
25000+: $0.21894
62500+: $0.21360
Inquiry

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