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. 168-6580
Mfr. Part No.L78L08CD13TR
$0.145
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8 V 100mA SOIC Fixed Surface Mount - 30 V 8 - 0 °C +125 °C 1 Positive ±10%
RS Stock No. 165-7699
Mfr. Part No.L79L08ACZ-AP
$0.161
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-8 V 100mA TO-92 Fixed Through Hole - -30 V 3 - 0 °C +125 °C 1 Negative ±5%
RS Stock No. 824-6964
Mfr. Part No.LM79M12CT/NOPB
$1.868
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-12 V 500mA TO-220 Fixed Surface Mount -35 V -17.5 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 163-0632
Mfr. Part No.MC78M12BDTRKG
$0.31
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12.5 V 700mA DPAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 795-8561
Mfr. Part No.L78M15CDT-TR
$0.744
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15 V 500mA DPAK Fixed Surface Mount - 35 V dc 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 178-5053
Mfr. Part No.L7806CD2T-TR
$0.516
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- - - - - - - - - - - - - -
RS Stock No. 463-959
Mfr. Part No.MC78L05ABPG
$0.619
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 181-3744
Mfr. Part No.RAA2108702GLG#AG0
$139.35
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0.6 → 5 V 70A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 686-9048
Mfr. Part No.L78M09CV
$0.319
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9 V 500mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 828-3345
Mfr. Part No.ZXTR1005K4-13
$0.605
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5.1 V 50mA TO-252 Fixed Surface Mount 10 V 100 V 3 2.3W -55 °C +125 °C 1 Positive ±2%
RS Stock No. 805-6537
Mfr. Part No.MC78L05ABPRAG
$0.281
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 167-7551
Mfr. Part No.BA178M09FP-E2
BrandROHM
$1.164
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9 V 500mA TO-252 Fixed Surface Mount 11.5 V 26 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 748-5228
Mfr. Part No.NCP502SQ37T2G
$1.098
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3.6 V, 3.7 V 80mA SC-88A Fixed Surface Mount - 12 V 5 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 751-5183
Mfr. Part No.ZLDO1117G33TA
$0.641
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3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 145-1205
Mfr. Part No.MC79L05ACD
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-5 V 100mA SOIC Fixed Surface Mount -7 V -20 V 8 - 0 °C +125 °C 1 Negative ±5%
RS Stock No. 159-9375
Mfr. Part No.ADP121-AUJZ33R7
$0.82
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3.3 V 150mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 686-9026
Mfr. Part No.L78S75CV
$1.014
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7.5 V 2A TO-220 Fixed Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 178-4727
Mfr. Part No.MC7812CD2TG
$0.90
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12 V 1A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 168-6576
Mfr. Part No.L78L15ABUTR
$0.229
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15 V 100mA SOT-89 Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 710-6310
Mfr. Part No.ZSR1000GTA
$1.728
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10 V 200mA SOT-223 Fixed Surface Mount 12 V 20 V 3+Tab 2W -55 °C +125 °C 1 Positive 2.5%
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