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. 922-2969
FabrikantnummerLM323K STEEL/NOPB
47,759 €
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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 -
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FabrikantON Semiconductor
0,50 €
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5 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS-stocknr. 686-9530
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5 V 1.5A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS-stocknr. 463-599
FabrikantnummerMC7805ACD2TG
FabrikantON Semiconductor
0,493 €
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5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS-stocknr. 169-8178
FabrikantnummerNJM7808DL1A-TE1
FabrikantNew Japan Radio
0,31 €
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8 V 1.5A Fixed TO-252 Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS-stocknr. 168-6062
FabrikantnummerL7824CV
0,311 €
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24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 398-697
FabrikantnummerTS7805CZ COG
0,267 €
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5 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 102-5762
FabrikantnummerLM317AMDT/NOPB
1,381 €
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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%
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FabrikantnummerUA78M05IDCY
0,439 €
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RS-stocknr. 713-9473
FabrikantnummerNJM7808DL1A-TE1
FabrikantNew Japan Radio
0,522 €
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8 V 1.5A Fixed TO-252 Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS-stocknr. 688-9228
FabrikantnummerLM317MDTRKG
FabrikantON Semiconductor
0,42 €
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1.2 → 37 V 250mA Adjustable DPAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 168-7267
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0,149 €
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15 V 500mA Fixed DPAK Surface Mount - 35 V dc 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 165-7751
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0,089 €
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-5 V 100mA Fixed SOT-89 Surface Mount - -30 V 3 - 0 °C +125 °C 1 Negative ±5%
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0,536 €
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
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FabrikantnummerL7805CDT-TR
0,521 €
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5 V 1.5A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
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FabrikantON Semiconductor
0,332 €
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24 V 1A Fixed TO-220 Through Hole - 40 V dc 3 15W -40 °C +125 °C 1 Positive -
RS-stocknr. 168-6800
FabrikantnummerL7908CV
0,322 €
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-8 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS-stocknr. 163-2412
FabrikantnummerLM317MDTRKG
FabrikantON Semiconductor
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1.2 → 37 V 250mA Adjustable DPAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 168-6559
FabrikantnummerL7805CDT-TR
0,22 €
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5 V 1.5A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 170-3424
FabrikantnummerMC79L05ABDG
FabrikantON Semiconductor
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