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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Description Price Output Voltage Maximum Output Current Package Type Output 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 Stock No. 671-0299
Mfr. Part No.LM350T
SGD1.31
Each (In a Pack of 5)
units
1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 124-1691
Mfr. Part No.LM350T
SGD1.058
Each (In a Tube of 50)
units
1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
SGD2.24
Each
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
SGD1.726
Each (In a Tube of 45)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 918-1971
Mfr. Part No.L7805CV
SGD0.235
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-0718
Mfr. Part No.LM340T-12/NOPB
SGD1.329
Each (In a Tube of 45)
units
12 V 1A TO-220 Fixed Through Hole 14.6 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 168-6061
Mfr. Part No.L7815CV
SGD0.268
Each (In a Tube of 50)
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 298-8558
Mfr. Part No.L7815CV
SGD0.88
Each
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 460-893
Mfr. Part No.LM340T-12/NOPB
SGD2.382
Each (In a Pack of 5)
units
12 V 1A TO-220 Fixed Through Hole 14.6 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 661-6232
Mfr. Part No.TL783CKCSE3
SGD3.53
Each (In a Pack of 5)
units
1.25 → 125 V 700mA TO-220 Adjustable Through Hole 21.5 V 150 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 655-644
Mfr. Part No.CSR2-15E
SGD107.03
Each
units
230 V 15A - Adjustable Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 714-0792
Mfr. Part No.LM317T
SGD0.725
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-5703
Mfr. Part No.LM317HVT/NOPB
SGD2.158
Each (In a Tube of 45)
units
1.2 → 57 V 1.5A TO-220 Adjustable Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6066
Mfr. Part No.L7905CV
SGD0.305
Each (In a Tube of 50)
units
-5 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 298-8615
Mfr. Part No.L7905CV
SGD0.77
Each
units
-5 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 535-9054
Mfr. Part No.LM317HVT/NOPB
SGD3.556
Each (In a Pack of 5)
units
1.2 → 57 V 1.5A TO-220 Adjustable Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6809
Mfr. Part No.LM317T
SGD0.288
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 795-9066
Mfr. Part No.LM337SP
SGD1.141
Each (In a Pack of 10)
units
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole - 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 168-7735
Mfr. Part No.LM337SP
SGD0.573
Each (In a Tube of 50)
units
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole - 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 102-8629
Mfr. Part No.L7815CV-DG
SGD0.392
Each (In a Tube of 50)
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
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