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. 460-893
Mfr. Part No.LM340T-12/NOPB
kr 13,12
Each (In a Pack of 5)
Units
12 V 1A Fixed TO-220 Through Hole 14.6 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 463-767
Mfr. Part No.MC7805CD2TG
kr 4,387
Each (In a Pack of 10)
Units
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 759-1809
Mfr. Part No.ADP2108AUJZ-3.3-R7
kr 15,274
Each (In a Pack of 5)
Units
3.3 V 600mA Fixed TSOT Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 155-7558
Mfr. Part No.LT3050EMSE#PBF
kr 35,501
Each (In a Tube of 37)
Units
0.6 → 44.5 V 100mA Adjustable MSOP Surface Mount 1.6 V 45 V 12 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 533-5812
Mfr. Part No.LM337LZ/NOPB
kr 6,98
Each
Units
-37 → -1.2 V 100mA Adjustable TO-92 Through Hole -40 V -4.2 V 3 0.625W -25 °C +125 °C 1 Negative -
RS Stock No. 178-5086
Mfr. Part No.L78L08ACZTR
kr 0,714
Each (On a Reel of 2000)
Units
- - - - - - - - - - - - - -
RS Stock No. 460-768
Mfr. Part No.LM340T-5.0/NOPB
kr 17,268
Each (In a Pack of 5)
Units
5 V 1A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 103-5102
Mfr. Part No.NCV4274AST33T3G
kr 4,996
Each (On a Reel of 4000)
Units
3.3 V 400mA Fixed SOT-223 Surface Mount 4.5 V 40 V 3+Tab - -40 °C +150 °C 1 Positive 2%
RS Stock No. 795-9066
Mfr. Part No.LM337SP
kr 7,707
Each (In a Pack of 10)
Units
-1.2 → -37 V 1.5A Adjustable TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 710-6304
Mfr. Part No.ZMR250FTA
kr 7,836
Each (In a Pack of 5)
Units
2.5 V 100mA Fixed SOT-23 Surface Mount 4.2 V 22.5 V 3 0.5W -55 °C +125 °C 1 Positive -
RS Stock No. 178-8869
Mfr. Part No.LM78L15ACM/NOPB
kr 5,569
Each (In a Tube of 95)
Units
- - - - - - - - - - - - - -
RS Stock No. 145-5384
Mfr. Part No.KA7912TU
kr 5,023
Each (In a Tube of 50)
Units
-12 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 168-6066
Mfr. Part No.L7905CV
kr 3,918
Each (In a Tube of 50)
Units
-5 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 822-9921
Mfr. Part No.LT3015EQ#PBF
kr 75,97
Each
Units
-1.22 → -29.3 V 1.5A Adjustable D2PAK Surface Mount -1.8 V -30 V 5 - -40 °C +125 °C 1 Negative -
RS Stock No. 877-2716
Mfr. Part No.L78L09ACZ-TR
kr 2,122
Each (In a Pack of 25)
Units
9.45 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-0704
Mfr. Part No.LM340T-5.0/NOPB
kr 14,787
Each (In a Tube of 45)
Units
5 V 1A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 163-0957
Mfr. Part No.MC7924BTG
kr 3,946
Each (In a Tube of 50)
Units
-24 V 1A Fixed TO-220 Through Hole - -40 V dc 3 15W -40 °C +125 °C 1 Negative -
RS Stock No. 125-0048
Mfr. Part No.MC7805BDTG
kr 3,961
Each (In a Tube of 75)
Units
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 661-6702
Mfr. Part No.UA7810CKCS
kr 7,058
Each (In a Pack of 5)
Units
10 V 1.5A Fixed TO-220 Through Hole 12.5 V 28 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 145-1206
Mfr. Part No.MC79L12ACLP
kr 1,113
Each (In a Bag of 1000)
Units
-12 V 100mA Fixed TO-92 Through Hole -14.5 V -27 V 3 - 0 °C +125 °C 1 Negative ±5%
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