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. 655-644
Mfr. Part No.CSR2-15E
kr 385,84
Each
Units
230 V 15A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 168-6062
Mfr. Part No.L7824CV
kr 3,105
Each (In a Tube of 50)
Units
24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 298-8564
Mfr. Part No.L7824CV
kr 3,89
Each
Units
24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6600
Mfr. Part No.L7806ABV
kr 3,743
Each (In a Tube of 50)
Units
6 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 761-5621
Mfr. Part No.LM317AEMP/NOPB
kr 14,556
Each (In a Pack of 5)
Units
1.2 → 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
kr 17,25
Each
Units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 178-5056
Mfr. Part No.L7808ABD2T-TR
kr 2,652
Each (On a Reel of 1000)
Units
- - - - - - - - - - - - - -
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
kr 4,99
Each
Units
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 922-8042
Mfr. Part No.ZMR330FTA
kr 3,439
Each (On a Reel of 3000)
Units
3.3 V 50mA Fixed SOT-23 Surface Mount 4.8 V 24 V 3 0.5W -55 °C +125 °C 1 Positive -
RS Stock No. 785-2375
Mfr. Part No.MC7808CDTT5G
kr 9,072
Each (On a Tape of 5)
Units
8 V 2.2A Fixed DPAK Surface Mount - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 686-9779
Mfr. Part No.L7806ABV
kr 4,496
Each (In a Pack of 10)
Units
6 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 710-6313
Mfr. Part No.ZMR330FTA
kr 8,196
Each (In a Pack of 5)
Units
3.3 V 50mA Fixed SOT-23 Surface Mount 4.8 V 24 V 3 0.5W -55 °C +125 °C 1 Positive -
RS Stock No. 145-1043
Mfr. Part No.UA7815CKCS
kr 5,436
Each (In a Tube of 50)
Units
15 V 1.5A Fixed TO-220 Through Hole 17.5 V 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 785-6958
Mfr. Part No.MC7812ABTG
kr 5,523
Each (In a Pack of 10)
Units
12 V 1A Fixed TO-220 Through Hole - 40 V 3 15W -40 °C +125 °C 1 Positive -
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
kr 4,108
Each (In a Tube of 50)
Units
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 102-3491
Mfr. Part No.MC7812CTG
kr 3,908
Each (In a Tube of 50)
Units
12 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 660-8013
Mfr. Part No.UA7815CKCS
kr 6,64
Each (In a Pack of 5)
Units
15 V 1.5A Fixed TO-220 Through Hole 17.5 V 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 751-3102
Mfr. Part No.AP7333-33SAG-7
kr 2,794
Each (In a Pack of 50)
Units
3.3 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 742-7691
Mfr. Part No.ADP150AUJZ-3.3-R7
kr 8,894
Each (In a Pack of 5)
Units
3.3 V 150mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 102-5703
Mfr. Part No.LM317HVT/NOPB
kr 17,948
Each (In a Tube of 45)
Units
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
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