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 Output Type Package 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. 163-2592
Mfr. Part No.NCP4625HSN12T1G
kr 3,009
Each (On a Reel of 3000)
Units
1.2 V 330mA Adjustable SOT-23 Surface Mount 2.6 V 10 V 5 - -40 °C +150 °C 1 Positive -
RS Stock No. 162-8933
Mfr. Part No.MC78M08CDTRKG
kr 1,249
Each (On a Reel of 2500)
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8 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 785-6964
Mfr. Part No.MC7815ABD2TG
kr 7,019
Each (In a Pack of 10)
Units
15 V 1A Fixed D2PAK Surface Mount - 40 V dc 3 15W -40 °C +125 °C 1 Positive -
RS Stock No. 178-4804
Mfr. Part No.MC79M08CDTG
kr 3,771
Each (In a Tube of 75)
Units
-8 V 500mA Fixed DPAK Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 805-6499
Mfr. Part No.MC7808BD2TG
kr 5,878
Each (In a Pack of 20)
Units
8 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 163-2602
Mfr. Part No.NCP4671DSN10T1G
kr 3,186
Each (On a Reel of 3000)
Units
1 V 400mA Fixed SOT-23 Surface Mount 2.6 V 5.25 V 5 - - +150 °C 1 Positive ±15mV
RS Stock No. 748-5240
Mfr. Part No.NCP512SQ25T2G
kr 1,54
Each (In a Pack of 5)
Units
2.5 V 200mA Fixed SC-88A Surface Mount 0 V 6 V 5 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 181-3742
Mfr. Part No.RAA2108502GLG#AG0
kr 339,28
Each
Units
0.6 → 5 V 50A Fixed HDA Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 785-7437
Mfr. Part No.NCV7812BTG
kr 4,526
Each (In a Pack of 10)
Units
12 V 1A Fixed TO-220 Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 751-3061
Mfr. Part No.AP7331-12WG-7
kr 2,875
Each (On a Tape of 50)
Units
1.2 V 300mA Fixed SOT-25 Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 178-2331
Mfr. Part No.NJM7905FA
kr 7,777
Each (In a Bag of 100)
Units
- - - - - - - - - - - - - -
RS Stock No. 169-0663
Mfr. Part No.AP7333-15SAG-7
kr 0,908
Each (On a Reel of 3000)
Units
1.5 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 178-5116
Mfr. Part No.L78L12ACZ
kr 0,714
Each (On a Reel of 2500)
Units
- - - - - - - - - - - - - -
RS Stock No. 163-1069
Mfr. Part No.NCV78M05BTG
kr 6,30
Each (In a Tube of 50)
Units
5 V 700mA Fixed TO-220 Through Hole - 40 V dc 3 5W -40 °C +125 °C 1 Positive -
RS Stock No. 464-091
Mfr. Part No.LM317LDG
kr 3,43
Each (In a Pack of 25)
Units
1.2 → 37 V 100mA Adjustable SOIC Surface Mount - - 8 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 102-3489
Mfr. Part No.MC7808CTG
kr 3,499
Each (In a Tube of 50)
Units
8 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 686-9559
Mfr. Part No.L78L09ABZ
kr 2,142
Each (In a Pack of 50)
Units
9 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 162-8919
Mfr. Part No.MC7805ABD2TR4G
kr 3,366
Each (On a Reel of 800)
Units
5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 192-4806
Mfr. Part No.LDLN025M33R
kr 3,918
Each (In a Pack of 10)
Units
3.3 V 250mA Fixed SOT-23 Surface Mount 1.5 V 5.5 V 5 - -40 °C +125 °C 1 - ±4%
RS Stock No. 181-3671
Mfr. Part No.RAA2108502GLG#AG0
kr 333,905
Each (In a Tray of 20)
Units
0.6 → 5 V 50A Fixed HDA Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
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