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. 168-6809
FabrikantnummerLM317T
0,438 €
Each (In a Tube of 50)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 714-0792
FabrikantnummerLM317T
0,438 €
Each (In a Pack of 10)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 370-9637
FabrikantnummerL200CV
2,683 €
Each (In a Tube of 50)
Aantal stuks
2.85 → 36 V 2A Adjustable PENTAWATT Through Hole 8 V 18 V 5 - -25 °C +150 °C 1 Positive -
RS-stocknr. 785-6936
FabrikantnummerMC7808ACTG
FabrikantON Semiconductor
0,433 €
Each (In a Pack of 10)
Aantal stuks
8 V 2.2A Fixed TO-220 Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS-stocknr. 100-0719
FabrikantnummerLM338T/NOPB
1,551 €
Each (In a Tube of 45)
Aantal stuks
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
1,822 €
Each (In a Pack of 5)
Aantal stuks
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. 170-3556
FabrikantnummerMC7908ACTG
FabrikantON Semiconductor
0,128 €
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. 805-6616
FabrikantnummerMC7908ACTG
FabrikantON Semiconductor
0,132 €
Each (In a Pack of 25)
Aantal stuks
-8 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative -
RS-stocknr. 922-3520
FabrikantnummerUA78M33CDCY
0,415 €
Each (In a Tube of 80)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 661-6733
FabrikantnummerUA78M33CDCY
0,50 €
Each (In a Pack of 5)
Aantal stuks
3.3 V 500mA Fixed SOT-223 Surface Mount 5.3 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-stocknr. 655-644
FabrikantnummerCSR2-15E
41,99 €
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Aantal stuks
230 V 15A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS-stocknr. 128-8855
FabrikantnummerBA7809FP-E2
FabrikantROHM
0,702 €
Each (In a Pack of 10)
Aantal stuks
9 V 1A Fixed TO-252 Surface Mount 11.5 V 26 V 3+Tab - -40 °C +85 °C 1 Positive -
RS-stocknr. 533-8209
FabrikantnummerLM317T/NOPB
1,73 €
Each
Aantal stuks
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. 168-6061
FabrikantnummerL7815CV
0,342 €
Each (In a Tube of 50)
Aantal stuks
15 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 298-8508
FabrikantnummerL7805ACV
0,50 €
Each
Aantal stuks
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS-stocknr. 298-8621
FabrikantnummerL7915CV
0,52 €
Each
Aantal stuks
-15 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS-stocknr. 168-6059
FabrikantnummerL7805ACV
0,412 €
Each (In a Tube of 50)
Aantal stuks
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS-stocknr. 100-5950
FabrikantnummerLM7912CT/NOPB
1,155 €
Each (In a Tube of 45)
Aantal stuks
-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 534-3908
FabrikantnummerLM7912CT/NOPB
1,35 €
Each
Aantal stuks
-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 168-6067
FabrikantnummerL7915CV
0,41 €
Each (In a Tube of 50)
Aantal stuks
-15 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
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