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. 460-900
FabrikantnummerLM338T/NOPB
1,786 €
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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. 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. 533-8209
FabrikantnummerLM317T/NOPB
2,21 €
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. 536-1394
FabrikantnummerLM78L05ACM/NOPB
2,21 €
Each
Aantal stuks
5 V 100mA Fixed SOIC Surface Mount 6.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS-stocknr. 100-5905
FabrikantnummerLM317T/NOPB
1,412 €
Each (In a Tube of 45)
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. 102-5753
FabrikantnummerLM78L05ACM/NOPB
0,582 €
Each (In a Tube of 95)
Aantal stuks
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
2,21 €
Each
Aantal stuks
-12 V 1.5A Fixed TO-220 Through Hole - -19 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 100-5950
FabrikantnummerLM7912CT/NOPB
1,175 €
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. 100-5906
FabrikantnummerLM337T/NOPB
1,23 €
Each (In a Tube of 45)
Aantal stuks
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole -50 V -4.2 V 3 - 0 °C +125 °C 1 Negative -
RS-stocknr. 661-6692
FabrikantnummerUA7805CKCS
0,674 €
Each (In a Pack of 5)
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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. 533-8221
FabrikantnummerLM337T/NOPB
2,21 €
Each
Aantal stuks
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole -50 V -4.2 V 3 - 0 °C +125 °C 1 Negative -
RS-stocknr. 121-9161
FabrikantnummerUA78M05CDCY
0,453 €
Each (In a Tube of 80)
Aantal stuks
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
0,556 €
Each (In a Pack of 5)
Aantal stuks
5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS-stocknr. 661-6705
FabrikantnummerUA7812CKCS
0,746 €
Each (In a Pack of 5)
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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. 796-8063
FabrikantnummerLM7812CT/NOPB
1,324 €
Each (In a Pack of 5)
Aantal stuks
12 V 1A Fixed TO-220 Through Hole - 17.5 V 3 - 0 °C +70 °C 1 Positive -
RS-stocknr. 661-6121
FabrikantnummerLM317KCS
0,69 €
Each (In a Pack of 5)
Aantal stuks
1.25 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 661-6730
FabrikantnummerUA78M05IDCY
0,55 €
Each (In a Pack of 5)
Aantal stuks
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
1,876 €
Each (In a Pack of 5)
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%
RS-stocknr. 102-5762
FabrikantnummerLM317AMDT/NOPB
1,703 €
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%
RS-stocknr. 533-5711
FabrikantnummerLM317LZ/NOPB
2,21 €
Each
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1.2 → 37 V 100mA Adjustable TO-92 Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -