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. 169-8951
Mfr. Part No.TS78M05CP ROG
$0.408
Each (On a Reel of 2500)
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5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
$0.332
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 103-5083
Mfr. Part No.NCP7805TG
$0.484
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5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 398-647
Mfr. Part No.TS78M05CP ROG
$0.449
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5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 166-2431
Mfr. Part No.KA78L05AZTA
$0.142
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 178-4745
Mfr. Part No.MC7812ABD2TG
$1.133
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12 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 162-6788
Mfr. Part No.UA78M05CKVURG3
$0.437
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5 V 500mA TO-252 Fixed Surface Mount 7 V 25 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 533-8221
Mfr. Part No.LM337T/NOPB
$2.73
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-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole -50 V -4.2 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 719-2768
Mfr. Part No.NCP7805TG
$0.724
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5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 100-8058
Mfr. Part No.MC78L05ABDG
$0.332
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 625-6316
Mfr. Part No.MC7812ABD2TG
$1.364
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12 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 785-7128
Mfr. Part No.MC7915ACD2TG
$1.036
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-15 V 1A D2PAK Fixed Surface Mount - -40 V dc 3 15W 0 °C +125 °C 1 Negative -
RS Stock No. 748-4795
Mfr. Part No.NCP4620DSN50T1G
$0.718
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5 V 165mA SOT-23 Fixed Surface Mount 2.6 V 10 V 5 - -40 °C +85 °C 1 Positive ±1%
RS Stock No. 102-3494
Mfr. Part No.LM317BTG
$0.439
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 686-9350
Mfr. Part No.L7812CD2T-TR
$0.728
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12 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 100-7568
Mfr. Part No.MC7805ACTG
$0.40
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 922-8285
Mfr. Part No.AP1117E33G-13
$0.16
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3.3 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 146-2238
Mfr. Part No.TS78L09CT A3G
$0.126
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9 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 661-6226
Mfr. Part No.TL780-05KCS
$1.306
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5 V 1.5A TO-220 Fixed Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive ±1%
RS Stock No. 798-9931
Mfr. Part No.ADM7150ARDZ-2.8
$11.16
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2.8 V 800mA SOIC Fixed Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
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