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. 464-114
Mfr. Part No.MC78M12CDTG
$0.62
Each (In a Pack of 20)
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12 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 125-0057
Mfr. Part No.MC78M12CDTG
$0.633
Each (In a Tube of 75)
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12 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 125-0050
Mfr. Part No.MC7806CTG
$0.536
Each (In a Tube of 50)
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6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 806-4068
Mfr. Part No.LM78L05ACZXA
$0.625
Each (In a Pack of 50)
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 761-3537
Mfr. Part No.LM317LZ
$0.503
Each (In a Pack of 25)
units
1.2 37 V 100mA TO-92 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-3490
Mfr. Part No.MC7809CTG
$0.865
Each (In a Tube of 50)
units
9 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 145-4096
Mfr. Part No.MC78L15ACPRAG
$0.195
Each (On a Reel of 2000)
units
15 V 100mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 516-6177
Mfr. Part No.MC7806CTG
$1.08
Each
units
6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 169-8719
Mfr. Part No.LM78L05ACZXA
$0.16
Each (On a Tape of 2000)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 518-8379
Mfr. Part No.MC78L15ACPRAG
$0.772
Each (In a Pack of 5)
units
15 V 100mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 145-5245
Mfr. Part No.MC7915CD2TR4G
$0.493
Each (On a Reel of 800)
units
-15 V 1A D2PAK Fixed Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 882-9770
Mfr. Part No.NCP785AH120T1G
$1.133
Each (In a Pack of 20)
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12 V 10.5 (Min)mA SOT-89 Fixed Surface Mount 85 V ac 260 V ac, 450 V dc 3 - - +150 °C 1 Positive ±5%
RS Stock No. 805-6622
Mfr. Part No.MC7915CD2TR4G
$0.581
Each (On a Tape of 20)
units
-15 V 1A D2PAK Fixed Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 125-0053
Mfr. Part No.MC7824ACTG
$0.642
Each (In a Tube of 50)
units
24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 163-0168
Mfr. Part No.NCP785AH120T1G
$0.577
Each (On a Reel of 2500)
units
12 V 10.5 (Min)mA SOT-89 Fixed Surface Mount 85 V ac 260 V ac, 450 V dc 3 - - +150 °C 1 Positive ±5%
RS Stock No. 785-6986
Mfr. Part No.MC7824ACTG
$0.789
Each (In a Pack of 10)
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24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 463-650
Mfr. Part No.MC7805CDTG
$0.875
Each (In a Pack of 20)
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5 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 748-8854
Mfr. Part No.NCP4683DSQ33T1G
$1.576
Each (In a Pack of 5)
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3.3 V 400mA SC-70 Fixed Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS Stock No. 102-1378
Mfr. Part No.MC7805CDTG
$0.432
Each (In a Tube of 75)
units
5 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 102-3493
Mfr. Part No.MC7824CTG
$0.362
Each (In a Tube of 50)
units
24 V 1A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive ±4%