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. 714-0675
Mfr. Part No.L78L05ABUTR
R 6.079
Each (In a Pack of 10)
units
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 370-9637
Mfr. Part No.L200CV
R 53.887
Each (In a Tube of 50)
units
2.85 → 36 V 2A Adjustable PENTAWATT Through Hole 8 V 18 V 5 - -25 °C +150 °C 1 Positive -
RS stock no. 921-5324
Mfr. Part No.LM337IMP/NOPB
R 14.239
Each (On a Reel of 1000)
units
-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 stock no. 686-9717
Mfr. Part No.LM317P
R 14.054
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A Adjustable TO-220FP Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS stock no. 102-5717
Mfr. Part No.LM78L05ACZ/NOPB
R 4.773
Each (On a Reel of 1800)
units
5 V 100mA Fixed TO-92 Through Hole 6.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS stock no. 761-4612
Mfr. Part No.LM337IMP/NOPB
R 38.246
Each (In a Pack of 5)
units
-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 stock no. 168-6586
Mfr. Part No.LM317P
R 14.063
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A Adjustable TO-220FP Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS stock no. 922-2372
Mfr. Part No.LM7815CT/NOPB
R 17.172
Each (In a Tube of 45)
units
15 V 1A Fixed TO-220 Through Hole - 17.5 V 3 - 0 °C +70 °C 1 Positive -
RS stock no. 796-8067
Mfr. Part No.LM7815CT/NOPB
R 25.97
Each (In a Pack of 5)
units
15 V 1A Fixed TO-220 Through Hole - 17.5 V 3 - 0 °C +70 °C 1 Positive -
RS stock no. 535-9975
Mfr. Part No.LM78L05ACZ/NOPB
R 11.236
Each (In a Pack of 5)
units
5 V 100mA Fixed TO-92 Through Hole 6.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS stock no. 463-767
Mfr. Part No.MC7805CD2TG
R 7.584
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. 145-4263
Mfr. Part No.MC7805ACD2TR4G
R 4.93
Each (On a Reel of 800)
units
5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 102-1392
Mfr. Part No.MC7805CD2TG
R 9.295
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. 165-7754
Mfr. Part No.L78L33ACUTR
R 2.212
Each (On a Reel of 2500)
units
3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS stock no. 686-9426
Mfr. Part No.L78L33ACUTR
R 4.33
Each (In a Pack of 25)
units
3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS stock no. 922-2978
Mfr. Part No.LM350K STEEL/NOPB
R 958.255
Each (In a Tray of 50)
units
1.2 → 33 V 3A Adjustable TO-3 Through Hole 4.2 V 35 V 3 30W 0 °C +125 °C 1 Positive -
RS stock no. 688-9250
Mfr. Part No.MC7812CDTRKG
R 11.505
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. 922-8288
Mfr. Part No.AP1117E50G-13
R 2.097
Each (On a Reel of 2500)
units
5 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS stock no. 751-2894
Mfr. Part No.AP1117E50G-13
R 3.943
Each (In a Pack of 50)
units
5 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS stock no. 163-2480
Mfr. Part No.MC7812CDTRKG
R 3.767
Each (On a Reel of 2500)
units
12 V 1A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%