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. 748-5253
Mfr. Part No.NCP512SQ33T2G
$1.442
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3.3 V 200mA SC-88A Fixed Surface Mount 0 V 6 V 5 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 828-3363
Mfr. Part No.ZXTR2012P5-13
$0.906
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13.2 V 50mA PowerDI 5 Fixed Surface Mount 15 V 100 V 3 1.82W -40 °C +125 °C 1 Positive ±10%
RS Stock No. 877-2728
Mfr. Part No.L7912CV-DG
$0.859
Each (In a Pack of 25)
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-12.6 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 163-2621
Mfr. Part No.NCP502SQ35T2G
$0.419
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3.5 V 80mA SC-88A Fixed Surface Mount - 12 V 5 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 121-6356
Mfr. Part No.MC7815ABD2TG
$1.221
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15 V 1A D2PAK Fixed Surface Mount - 40 V dc 3 15W -40 °C +125 °C 1 Positive -
RS Stock No. 785-2375
Mfr. Part No.MC7808CDTT5G
$1.926
Each (On a Tape of 5)
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8 V 2.2A DPAK Fixed Surface Mount - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 178-4376
Mfr. Part No.NCP786AMNADJTBG
$0.696
Each (On a Reel of 1000)
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1.27 → 15 V 10mA DFN Adjustable Surface Mount 55 V 450 V 6 - - +85 °C 1 - ±5%
RS Stock No. 516-5764
Mfr. Part No.MC78L12ACPG
$0.784
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12 V 100mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 163-2478
Mfr. Part No.MC7805CDTRKG
$0.311
Each (On a Reel of 2500)
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5 V 2.2A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 163-2477
Mfr. Part No.MC7805BD2TR4G
$0.526
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5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 167-7296
Mfr. Part No.BA17820FP-E2
BrandROHM
$1.573
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20 V 1A TO-252 Fixed Surface Mount 23 V 33 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 785-7014
Mfr. Part No.MC78L15ACDR2G
$0.499
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15 V 100mA SOIC Fixed Surface Mount - 40 V dc 8 625mW 0 °C +125 °C 1 Positive -
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