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. 463-054
Mfr. Part No.MC7805ACTG
$0.834
Each (In a Pack of 20)
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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. 163-2580
Mfr. Part No.NCP4620DSN50T1G
$0.611
Each (On a Reel of 3000)
units
5 V 165mA SOT-23 Fixed Surface Mount 2.6 V 10 V 5 - -40 °C +85 °C 1 Positive ±1%
RS Stock No. 159-9540
Mfr. Part No.ADM7150ARDZ-2.8
$10.967
Each (In a Tube of 98)
units
2.8 V 800mA SOIC Fixed Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 145-0483
Mfr. Part No.LM337KCSE3
$1.232
Each (In a Tube of 50)
units
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole -40 V -4.2 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 464-104
Mfr. Part No.LM337TG
$1.079
Each (In a Pack of 10)
units
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 398-647
Mfr. Part No.TS78M05CP ROG
$1.008
Each (In a Pack of 50)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 751-3092
Mfr. Part No.AP7333-15SAG-7
$0.556
Each (On a Tape of 50)
units
1.5 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 178-4745
Mfr. Part No.MC7812ABD2TG
$1.177
Each (In a Tube of 50)
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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. 102-3494
Mfr. Part No.LM317BTG
$0.912
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 751-2890
Mfr. Part No.AP1117E33G-13
$0.601
Each (In a Pack of 50)
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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. 157-8360
Mfr. Part No.LT1033CT#PBF
$7.769
Each (In a Tube of 50)
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-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 761-5680
Mfr. Part No.LM340MP-5.0/NOPB
$2.872
Each (In a Pack of 5)
units
5 V 1A SOT-223 Fixed Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 785-6831
Mfr. Part No.LM317LZRAG
$0.598
Each (In a Pack of 20)
units
1.2 → 37 V 200mA TO-92 Adjustable Through Hole 4.25 V 41.25 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 463-290
Mfr. Part No.MC78L05ABDG
$0.498
Each (In a Pack of 25)
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 125-0052
Mfr. Part No.MC7818CTG
$0.596
Each (In a Tube of 50)
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18 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 103-5083
Mfr. Part No.NCP7805TG
$0.782
Each (In a Tube of 50)
units
5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 102-3502
Mfr. Part No.MC79L05ACPG
$0.233
Each (In a Bag of 2000)
units
-5 V 100mA TO-92 Fixed Through Hole - -30 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 398-578
Mfr. Part No.TS78L09CT A3G
$0.286
Each (In a Pack of 50)
units
9 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 798-9931
Mfr. Part No.ADM7150ARDZ-2.8
$13.79
Each
units
2.8 V 800mA SOIC Fixed Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 100-3972
Mfr. Part No.LM350AT/NOPB
$4.967
Each (In a Tube of 45)
units
1.2 → 33 V 3A TO-220 Adjustable Through Hole 4.2 V 35 V 3 25W -40 °C +125 °C 1 Positive ±1%
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