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 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 stock no. 704-4010
Mfr. Part No.LM7812CT
R 12.464
Each (In a Pack of 5)
units
12 V 1A Fixed TO-220 Through Hole - 35 V 3 - - - 1 Positive 2%
RS stock no. 806-2790
Mfr. Part No.LM317AHVT
R 10.023
Each (In a Tube of 50)
units
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole - 60 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 704-4016
Mfr. Part No.LM7809CT
R 10.898
Each (In a Pack of 5)
units
9 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS stock no. 184-4293
Mfr. Part No.MC7815ACD2TG
R 8.091
Each (In a Tube of 50)
units
15 V 1A Fixed D2PAK Surface Mount 17 V 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 464-097
Mfr. Part No.LM317D2TG
R 7.102
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A Adjustable D2PAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 102-1378
Mfr. Part No.MC7805CDTG
R 4.264
Each (In a Tube of 75)
units
5 V 1A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 463-650
Mfr. Part No.MC7805CDTG
R 6.826
Each (In a Pack of 20)
units
5 V 1A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 102-2270
Mfr. Part No.LM317D2TG
R 9.246
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A Adjustable D2PAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 464-108
Mfr. Part No.LM317MDTG
R 7.70
Each (In a Pack of 10)
units
1.2 → 37 V 250mA Adjustable DPAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 102-2271
Mfr. Part No.LM317MDTG
R 7.185
Each (In a Tube of 75)
units
1.2 → 37 V 250mA Adjustable DPAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 124-1691
Mfr. Part No.LM350T
R 10.277
Each (In a Tube of 50)
units
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS stock no. 671-0299
Mfr. Part No.LM350T
R 19.656
Each (In a Pack of 5)
units
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS stock no. 516-4935
Mfr. Part No.MC78M15CDTG
R 38.03
Each
units
15 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 125-0058
Mfr. Part No.MC78M15CDTG
R 4.817
Each (In a Tube of 75)
units
15 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 808-3892
Mfr. Part No.MC7805ACD2TR4G
R 6.142
Each (On a Tape of 25)
units
5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 704-4026
Mfr. Part No.LM7815ACT
R 11.872
Each (In a Pack of 5)
units
15 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS stock no. 688-9250
Mfr. Part No.MC7812CDTRKG
R 12.025
Each (In a Pack of 2)
units
12 V 1A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 463-767
Mfr. Part No.MC7805CD2TG
R 5.876
Each (In a Pack of 10)
units
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 102-1392
Mfr. Part No.MC7805CD2TG
R 7.662
Each (In a Tube of 50)
units
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS stock no. 145-4263
Mfr. Part No.MC7805ACD2TR4G
R 4.718
Each (On a Reel of 800)
units
5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -