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. 829-3266
Mfr. Part No.LR8N3-G
BrandMicrochip
$1.065
Each (In a Pack of 10)
units
1.2 → 440 V 30mA TO-92 Adjustable Through Hole 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 170-4344
Mfr. Part No.LR8N3-G
BrandMicrochip
$0.859
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 889-5991
Mfr. Part No.LR8K4-G
BrandMicrochip
$1.061
Each (On a Reel of 2000)
units
1.2 → 440 V 30mA TO-252 Adjustable Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 829-3421
Mfr. Part No.LR12N3-G
BrandMicrochip
$1.597
Each (In a Pack of 10)
units
1.2 → 88 V 100mA TO-92 Adjustable Through Hole 13.2 V 100 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 170-4350
Mfr. Part No.LR12N3-G
BrandMicrochip
$1.664
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 829-3257
Mfr. Part No.LR8K4-G
BrandMicrochip
$1.352
Each (In a Pack of 10)
units
1.2 → 440 V 30mA TO-252 Adjustable Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 829-3443
Mfr. Part No.SR086SG-G
BrandMicrochip
$1.642
Each (In a Pack of 10)
units
9 → 50 V 100mA SOIC Adjustable Surface Mount 90 V 270 V 8 200mW -40 °C +125 °C 1 Positive -
RS Stock No. 146-0321
Mfr. Part No.MIC5282YMME
BrandMicrochip
$1.95
Each (In a Tube of 100)
units
1.27 → 5.5 V 50mA MSOP Adjustable Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 829-3437
Mfr. Part No.LR645N5-G
BrandMicrochip
$1.63
Each (In a Pack of 5)
units
9 → 11.5 V 30mA TO-220 Adjustable Through Hole 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS Stock No. 178-5280
Mfr. Part No.LR645N8-G
BrandMicrochip
$0.71
Each (On a Reel of 2000)
units
9 → 11.5 V 30mA SOT-89 Adjustable Surface Mount 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS Stock No. 829-3446
Mfr. Part No.LR645N8-G
BrandMicrochip
$0.888
Each (In a Pack of 10)
units
9 → 11.5 V 30mA SOT-89 Adjustable Surface Mount 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS Stock No. 889-5796
Mfr. Part No.LR8N8-G
BrandMicrochip
$0.643
Each (On a Reel of 2000)
units
1.2 → 440 V 30mA SOT-89 Adjustable Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 911-2802
Mfr. Part No.MIC5281YMME
BrandMicrochip
$2.624
Each (In a Pack of 5)
units
1.27 → 5.5 V 25mA MSOP Adjustable Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 165-6437
Mfr. Part No.MIC94325YMT-TR
BrandMicrochip
$0.48
Each (In a Pack of 25)
units
1.2 → 3.4 V 500mA DFN Adjustable Surface Mount 1.8 V 3.6 V 6 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 829-3433
Mfr. Part No.LR645N3-G
BrandMicrochip
$0.689
Each (In a Pack of 20)
units
9 → 11.5 V 30mA TO-92 Adjustable Through Hole 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS Stock No. 144-5871
Mfr. Part No.SR10LG-G
BrandMicrochip
$0.635
Each (On a Reel of 3300)
units
6 → 28 V 50mA SOIC Adjustable Surface Mount 90 V 275 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 145-9146
Mfr. Part No.MIC5282-5.0YMME
BrandMicrochip
$1.95
Each (In a Tube of 100)
units
5 V 50mA MSOP Fixed Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 911-2809
Mfr. Part No.MIC5282-5.0YMME
BrandMicrochip
$2.892
Each (In a Pack of 5)
units
5 V 50mA MSOP Fixed Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 170-4351
Mfr. Part No.LR645N3-G
BrandMicrochip
$0.698
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 829-3269
Mfr. Part No.LR8N8-G
BrandMicrochip
$0.787
Each (In a Pack of 10)
units
1.2 → 440 V 30mA SOT-89 Adjustable Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%