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. 829-3257
Mfr. Part No.LR8K4-G
BrandMicrochip
R 15.188
Each (In a Pack of 10)
units
1.2 → 440 V 30mA Adjustable TO-252 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS stock no. 889-5991
Mfr. Part No.LR8K4-G
BrandMicrochip
R 11.904
Each (On a Reel of 2000)
units
1.2 → 440 V 30mA Adjustable TO-252 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS stock no. 178-5364
Mfr. Part No.SR086SG-G
BrandMicrochip
R 12.201
Each (On a Reel of 3300)
units
9 → 50 V 100mA Adjustable SOIC Surface Mount 90 V 270 V 8 200mW -40 °C +125 °C 1 Positive -
RS stock no. 170-4351
Mfr. Part No.LR645N3-G
BrandMicrochip
R 5.325
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS stock no. 829-3443
Mfr. Part No.SR086SG-G
BrandMicrochip
R 12.546
Each (In a Pack of 10)
units
9 → 50 V 100mA Adjustable SOIC Surface Mount 90 V 270 V 8 200mW -40 °C +125 °C 1 Positive -
RS stock no. 170-4350
Mfr. Part No.LR12N3-G
BrandMicrochip
R 14.209
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS stock no. 829-3421
Mfr. Part No.LR12N3-G
BrandMicrochip
R 18.468
Each (In a Pack of 10)
units
1.2 → 88 V 100mA Adjustable TO-92 Through Hole 13.2 V 100 V 3 - -40 °C +85 °C 1 Positive ±5%
RS stock no. 178-5280
Mfr. Part No.LR645N8-G
BrandMicrochip
R 6.064
Each (On a Reel of 2000)
units
9 → 11.5 V 30mA Adjustable SOT-89 Surface Mount 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS stock no. 178-4926
Mfr. Part No.LR645N5-G
BrandMicrochip
R 16.738
Each (In a Tube of 50)
units
9 → 11.5 V 30mA Adjustable TO-220 Through Hole 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS stock no. 170-4344
Mfr. Part No.LR8N3-G
BrandMicrochip
R 7.452
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS stock no. 829-3266
Mfr. Part No.LR8N3-G
BrandMicrochip
R 12.435
Each (In a Pack of 10)
units
1.2 → 440 V 30mA Adjustable TO-92 Through Hole 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS stock no. 829-3446
Mfr. Part No.LR645N8-G
BrandMicrochip
R 6.263
Each (In a Pack of 10)
units
9 → 11.5 V 30mA Adjustable SOT-89 Surface Mount 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS stock no. 829-3437
Mfr. Part No.LR645N5-G
BrandMicrochip
R 20.246
Each (In a Pack of 5)
units
9 → 11.5 V 30mA Adjustable TO-220 Through Hole 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS stock no. 829-3269
Mfr. Part No.LR8N8-G
BrandMicrochip
R 10.148
Each (In a Pack of 10)
units
1.2 → 440 V 30mA Adjustable SOT-89 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS stock no. 829-3455
Mfr. Part No.SR10LG-G
BrandMicrochip
R 5.135
Each (In a Pack of 20)
units
6 → 28 V 50mA Adjustable SOIC Surface Mount 90 V 275 V 8 - -40 °C +125 °C 1 Positive -
RS stock no. 177-0755
Mfr. Part No.MIC5283-5.0YME
BrandMicrochip
R 14.978
Each (In a Pack of 5)
units
5 V 150mA Fixed SOIC Surface Mount 6 V 120 V 8 - -40 °C +125 °C 1 Positive ±5%
RS stock no. 911-2809
Mfr. Part No.MIC5282-5.0YMME
BrandMicrochip
R 25.512
Each (In a Pack of 5)
units
5 V 50mA Fixed MSOP Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS stock no. 165-5153
Mfr. Part No.MIC94325YMT-TR
BrandMicrochip
R 4.392
Each (On a Reel of 5000)
units
1.2 → 3.4 V 500mA Adjustable DFN Surface Mount 1.8 V 3.6 V 6 - -40 °C +125 °C 1 Positive ±3%
RS stock no. 177-3296
Mfr. Part No.MIC94310-PYMT-T5
BrandMicrochip
R 3.606
Each (In a Pack of 20)
units
3 V 200mA Fixed DFN Surface Mount 1.8 V 3.6 V 4 - -40 °C +125 °C 1 - ±3%
RS stock no. 177-0782
Mfr. Part No.MIC5355-SGYMME
BrandMicrochip
R 4.923
Each (In a Pack of 20)
units
1.8 V, 3.3 V 500mA Fixed MSOP Surface Mount 2.5 V 5.5 V 8 - -40 °C +125 °C 2 Positive ±3%