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
€ 1,552
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. 124-1691
FabrikantnummerLM350T
FabrikantON Semiconductor
€ 0,959
Each (In a Tube of 50)
Aantal stuks
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 686-9741
FabrikantnummerL7815CP
€ 0,617
Each (In a Pack of 10)
Aantal stuks
15 V 1.5A Fixed TO-220FP Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 168-6593
FabrikantnummerL7815CP
€ 0,561
Each (In a Tube of 50)
Aantal stuks
15 V 1.5A Fixed TO-220FP Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 460-900
FabrikantnummerLM338T/NOPB
€ 1,786
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. 124-1350
FabrikantnummerLM317LZ
FabrikantON Semiconductor
€ 0,108
Each (In a Bag of 1000)
Aantal stuks
1.2 → 37 V 100mA Adjustable TO-92 Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 793-1346
FabrikantnummerL7805CV-DG
€ 0,462
Each (In a Pack of 10)
Aantal stuks
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-stocknr. 102-9429
FabrikantnummerL7805CV-DG
€ 0,42
Each (In a Tube of 50)
Aantal stuks
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-stocknr. 714-7783
FabrikantnummerL78S12CV
€ 0,581
Each (In a Pack of 10)
Aantal stuks
12 V 2A Fixed TO-220 Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 163-2478
FabrikantnummerMC7805CDTRKG
FabrikantON Semiconductor
€ 0,15
Each (On a Reel of 2500)
Aantal stuks
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 688-9253
FabrikantnummerMC7805CDTRKG
FabrikantON Semiconductor
€ 0,45
Each (In a Pack of 2)
Aantal stuks
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 102-3528
FabrikantnummerL78S12CV
€ 0,524
Each (In a Tube of 50)
Aantal stuks
12 V 2A Fixed TO-220 Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 168-6799
FabrikantnummerL78L05ACUTR
€ 0,118
Each (On a Reel of 2500)
Aantal stuks
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 714-0679
FabrikantnummerL78L05ACUTR
€ 0,345
Each (In a Pack of 10)
Aantal stuks
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 178-4802
FabrikantnummerMC78M08CDTG
FabrikantON Semiconductor
€ 0,28
Each (In a Tube of 75)
Aantal stuks
8 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 714-7768
FabrikantnummerL78L05ACZTR
€ 0,302
Each (In a Pack of 25)
Aantal stuks
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 102-3529
FabrikantnummerL78L05ACZTR
€ 0,108
Each (On a Reel of 2000)
Aantal stuks
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 761-4612
FabrikantnummerLM337IMP/NOPB
€ 1,45
Each (In a Pack of 5)
Aantal stuks
-1.2 → -37 V 1.5A Adjustable SOT-223 Surface Mount -4.2 V -40 V 3+Tab - -40 °C +125 °C 1 Negative -
RS-stocknr. 655-638
FabrikantnummerCSR2-10E
€ 36,12
Each
Aantal stuks
230 V 10A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS-stocknr. 686-9717
FabrikantnummerLM317P
€ 0,794
Each (In a Pack of 10)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220FP Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
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