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. 121-6360
Mfr. Part No.NCV7812BTG
$0.817
Each (In a Tube of 50)
units
12 V 1A TO-220 Fixed Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
$0.831
Each (In a Tube of 50)
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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. 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. 533-5698
Mfr. Part No.LM317AT/NOPB
$4.73
Each
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 146-2238
Mfr. Part No.TS78L09CT A3G
$0.158
Each (On a Tape of 2000)
units
9 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
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%
RS Stock No. 178-4747
Mfr. Part No.MC78M12ABTG
$0.888
Each (In a Tube of 50)
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12 V 700mA TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 748-4795
Mfr. Part No.NCP4620DSN50T1G
$1.486
Each (In a Pack of 5)
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. 162-5911
Mfr. Part No.TL780-05KCS
$0.79
Each (In a Tube of 50)
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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. 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. 625-6366
Mfr. Part No.MC78M12ABTG
$1.112
Each (In a Pack of 5)
units
12 V 700mA TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
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. 168-6067
Mfr. Part No.L7915CV
$0.855
Each (In a Tube of 50)
units
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 661-6226
Mfr. Part No.TL780-05KCS
$1.618
Each (In a Pack of 5)
units
5 V 1.5A TO-220 Fixed Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive ±1%
RS Stock No. 884-2552
Mfr. Part No.LT1033CT#PBF
$13.10
Each (In a Pack of 2)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
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. 298-8621
Mfr. Part No.L7915CV
$1.05
Each
units
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 785-7018
Mfr. Part No.MC78L18ACPRAG
$0.592
Each (In a Pack of 20)
units
18 V 100mA TO-92 Fixed Through Hole - 40 V dc 3 625mW 0 °C +125 °C 1 Positive -
RS Stock No. 157-8360
Mfr. Part No.LT1033CT#PBF
$7.769
Each (In a Tube of 50)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
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%
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