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. 168-6061
Mfr. Part No.L7815CV
TWD14.40
Each (In a Tube of 50)
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15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 460-900
Mfr. Part No.LM338T/NOPB
TWD73.00
Each (In a Pack of 5)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 806-4112
Mfr. Part No.MC78L05ACHX
TWD14.10
Each (In a Pack of 25)
units
5 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 298-8558
Mfr. Part No.L7815CV
TWD17.00
Each
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 918-1971
Mfr. Part No.L7805CV
TWD13.90
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
TWD62.10
Each (In a Tube of 45)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 163-2602
Mfr. Part No.NCP4671DSN10T1G
TWD14.90
Each (On a Reel of 3000)
units
1 V 400mA SOT-23 Fixed Surface Mount 2.6 V 5.25 V 5 - - +150 °C 1 Positive ±15mV
RS Stock No. 779-9628
Mfr. Part No.LT317AT#PBF
TWD177.00
Each (In a Pack of 2)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 298-8621
Mfr. Part No.L7915CV
TWD23.00
Each
units
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 155-5383
Mfr. Part No.LT317AT#PBF
TWD99.80
Each (In a Tube of 50)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 169-8180
Mfr. Part No.NJM7815DL1A-TE1
TWD11.00
Each (On a Reel of 3000)
units
15 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 748-4922
Mfr. Part No.NCP4671DSN10T1G
TWD36.50
Each (In a Pack of 2)
units
1 V 400mA SOT-23 Fixed Surface Mount 2.6 V 5.25 V 5 - - +150 °C 1 Positive ±15mV
RS Stock No. 168-6067
Mfr. Part No.L7915CV
TWD17.10
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. 793-1355
Mfr. Part No.L7812CV-DG
TWD16.70
Each (In a Pack of 10)
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12 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 103-2162
Mfr. Part No.MC7805ABD2TG
TWD26.50
Each (In a Tube of 50)
units
5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
TWD73.00
Each
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
TWD26.10
Each (In a Tube of 45)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-7135
Mfr. Part No.L7812CV-DG
TWD16.70
Each (In a Tube of 50)
units
12 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 516-5988
Mfr. Part No.MC7805ABD2TG
TWD32.20
Each (In a Pack of 5)
units
5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 713-9483
Mfr. Part No.NJM7815DL1A-TE1
TWD18.40
Each (In a Pack of 5)
units
15 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -