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. 100-0719
FabrikantnummerLM338T/NOPB
1,647 €
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1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS-stocknr. 460-900
FabrikantnummerLM338T/NOPB
1,786 €
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1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS-stocknr. 661-6733
FabrikantnummerUA78M33CDCY
0,532 €
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3.3 V 500mA Fixed SOT-223 Surface Mount 5.3 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-stocknr. 922-3520
FabrikantnummerUA78M33CDCY
0,442 €
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- - - - - - - - - - - - - -
RS-stocknr. 533-8209
FabrikantnummerLM317T/NOPB
1,88 €
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1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 100-5950
FabrikantnummerLM7912CT/NOPB
1,23 €
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-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 100-5905
FabrikantnummerLM317T/NOPB
1,566 €
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1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 536-1394
FabrikantnummerLM78L05ACM/NOPB
0,85 €
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5 V 100mA Fixed SOIC Surface Mount 6.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS-stocknr. 534-3908
FabrikantnummerLM7912CT/NOPB
1,47 €
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-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 661-6692
FabrikantnummerUA7805CKCS
0,726 €
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5 V 1.5A Fixed TO-220 Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 922-3511
FabrikantnummerUA7805CKCS
0,60 €
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- - - - - - - - - - - - - -
RS-stocknr. 121-9161
FabrikantnummerUA78M05CDCY
0,471 €
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-stocknr. 661-6721
FabrikantnummerUA78M05CDCY
0,57 €
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-stocknr. 922-3514
FabrikantnummerUA7812CKCS
0,60 €
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- - - - - - - - - - - - - -
RS-stocknr. 661-6705
FabrikantnummerUA7812CKCS
0,698 €
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12 V 1.5A Fixed TO-220 Through Hole 14.5 V 30 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 661-6730
FabrikantnummerUA78M05IDCY
0,592 €
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS-stocknr. 536-1647
FabrikantnummerLM317AMDT/NOPB
2,088 €
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1.2 → 37 V 500mA Adjustable TO-252 Surface Mount 4.2 V 40 V 3 - -40 °C +125 °C 1 Positive ±1%
RS-stocknr. 663-3237
FabrikantnummerLM323K STEEL/NOPB
96,79 €
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5 V 3A Fixed TO-3 Through Hole 7.5 V 20 V 3 30W 0 °C +125 °C 1 Positive -
RS-stocknr. 922-2969
FabrikantnummerLM323K STEEL/NOPB
50,274 €
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Aantal stuks
5 V 3A Fixed TO-3 Through Hole 7.5 V 20 V 3 30W 0 °C +125 °C 1 Positive -
RS-stocknr. 102-5762
FabrikantnummerLM317AMDT/NOPB
1,485 €
Each (In a Tube of 75)
Aantal stuks
1.2 → 37 V 500mA Adjustable TO-252 Surface Mount 4.2 V 40 V 3 - -40 °C +125 °C 1 Positive ±1%