Linear Voltage Regulators

A Linear Voltage Regulator ensures the output voltage from the circuit is maintained at a specific voltage.

The device acts as a variable resistor, continuously adjusting to maintain a constant output voltage. The regulated voltage must be lower than the input voltage. Simple voltage regulator contains a Zener Diode and a resistor but more complicated versions include elements like a voltage reference and error amplifiers.

A more specific type of regulator are Low Dropout Voltage Regulators (LDO) which can regulate voltage even when the power supply voltage is very close to the supply voltage.


How to choose linear voltage regulator ICs?


The primary feature in choosing a regulator is usually the Output voltage as the main purpose of one is to regulate the voltage to a specific value such as 3.3V. Its accuracy to this voltage across temperature and load current is another consideration as is its maximum load. The dropout voltage value will be particularly important with battery applications.


How to test a linear voltage regulator?


  1. Set your multimeter to the voltage setting
  2. Check the datasheet to determine which pins are the ground, input and output.
  3. Attach the red wire to the input and the black wire to the ground, the multimeter should give a reading higher than the regulators' output value. If not then there is a power supply issue.
  4. Attach the red to the ground and the black wire the output, the multimeter should then give the regulators' output value (plus minus its accuracy). If not then the regulator is likely to be faulty.

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Omschrijving Prijs Output Voltage Maximum Output Current Output Type Package Type Mounting Type Minimum Input Voltage Maximum Input Voltage Pin Count Power Rating Minimum Operating Temperature Maximum Operating Temperature Number of Outputs Polarity Accuracy
RS-stocknr. 785-6936
FabrikantnummerMC7808ACTG
FabrikantON Semiconductor
0,429 €
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8 V 2.2A Fixed TO-220 Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS-stocknr. 805-6616
FabrikantnummerMC7908ACTG
FabrikantON Semiconductor
0,446 €
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-8 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative -
RS-stocknr. 170-3556
FabrikantnummerMC7908ACTG
FabrikantON Semiconductor
0,222 €
Each (In a Tube of 50)
Aantal stuks
-8 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative -
RS-stocknr. 463-767
FabrikantnummerMC7805CD2TG
FabrikantON Semiconductor
0,492 €
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Aantal stuks
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 785-6958
FabrikantnummerMC7812ABTG
FabrikantON Semiconductor
0,49 €
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Aantal stuks
12 V 1A Fixed TO-220 Through Hole - 40 V 3 15W -40 °C +125 °C 1 Positive -
RS-stocknr. 121-6355
FabrikantnummerMC7812ABTG
FabrikantON Semiconductor
0,49 €
Each (In a Tube of 50)
Aantal stuks
12 V 1A Fixed TO-220 Through Hole - 40 V 3 15W -40 °C +125 °C 1 Positive -
RS-stocknr. 102-1392
FabrikantnummerMC7805CD2TG
FabrikantON Semiconductor
0,461 €
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Aantal stuks
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 166-3617
FabrikantnummerKA78L05AZBU
FabrikantON Semiconductor
0,079 €
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 - -
RS-stocknr. 807-8824
FabrikantnummerKA78L05AZBU
FabrikantON Semiconductor
0,288 €
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 - -
RS-stocknr. 785-7125
FabrikantnummerMC7915BTG
FabrikantON Semiconductor
0,47 €
Each (In a Pack of 5)
Aantal stuks
-15 V 1A Fixed TO-220 Through Hole - -40 V dc 3 15W -40 °C +125 °C 1 Negative -
RS-stocknr. 516-6212
FabrikantnummerMC7912CTG
FabrikantON Semiconductor
0,50 €
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Aantal stuks
-12 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 516-4806
FabrikantnummerMC7808CTG
FabrikantON Semiconductor
0,47 €
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Aantal stuks
8 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 178-4774
FabrikantnummerMC7915BTG
FabrikantON Semiconductor
0,402 €
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-15 V 1A Fixed TO-220 Through Hole - -40 V dc 3 15W -40 °C +125 °C 1 Negative -
RS-stocknr. 103-5083
FabrikantnummerNCP7805TG
FabrikantON Semiconductor
0,392 €
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5 V 1A Fixed TO-220 Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS-stocknr. 719-2768
FabrikantnummerNCP7805TG
FabrikantON Semiconductor
0,429 €
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Aantal stuks
5 V 1A Fixed TO-220 Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS-stocknr. 102-3489
FabrikantnummerMC7808CTG
FabrikantON Semiconductor
0,44 €
Each (In a Tube of 50)
Aantal stuks
8 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 163-2412
FabrikantnummerLM317MDTRKG
FabrikantON Semiconductor
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Each (On a Reel of 2500)
Aantal stuks
1.2 → 37 V 250mA Adjustable DPAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 102-3503
FabrikantnummerMC7805BTG
FabrikantON Semiconductor
0,435 €
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5 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS-stocknr. 688-9310
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0,395 €
Each (In a Pack of 2)
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-5 V 100mA Fixed SOIC Surface Mount - -30 V 8 - -40 °C +125 °C 1 Negative -
RS-stocknr. 688-9228
FabrikantnummerLM317MDTRKG
FabrikantON Semiconductor
0,45 €
Each (In a Pack of 2)
Aantal stuks
1.2 → 37 V 250mA Adjustable DPAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%