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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Omschrijving Prijs 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-stocknr. 170-4344
FabrikantnummerLR8N3-G
FabrikantMicrochip
€ 0,396
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Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 829-3266
FabrikantnummerLR8N3-G
FabrikantMicrochip
€ 0,451
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Aantal stuks
1.2 → 440 V 30mA Adjustable TO-92 Through Hole 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS-stocknr. 829-3269
FabrikantnummerLR8N8-G
FabrikantMicrochip
€ 0,477
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Aantal stuks
1.2 → 440 V 30mA Adjustable SOT-89 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS-stocknr. 889-5796
FabrikantnummerLR8N8-G
FabrikantMicrochip
€ 0,407
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Aantal stuks
1.2 → 440 V 30mA Adjustable SOT-89 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS-stocknr. 829-3446
FabrikantnummerLR645N8-G
FabrikantMicrochip
€ 0,542
Each (In a Pack of 10)
Aantal stuks
9 → 11.5 V 30mA Adjustable SOT-89 Surface Mount 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS-stocknr. 178-5280
FabrikantnummerLR645N8-G
FabrikantMicrochip
€ 0,418
Each (On a Reel of 2000)
Aantal stuks
9 → 11.5 V 30mA Adjustable SOT-89 Surface Mount 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS-stocknr. 911-2806
FabrikantnummerMIC5282YMME
FabrikantMicrochip
€ 1,388
Each (In a Pack of 5)
Aantal stuks
1.27 → 5.5 V 50mA Adjustable MSOP Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS-stocknr. 178-5364
FabrikantnummerSR086SG-G
FabrikantMicrochip
€ 0,757
Each (On a Reel of 3300)
Aantal stuks
9 → 50 V 100mA Adjustable SOIC Surface Mount 90 V 270 V 8 200mW -40 °C +125 °C 1 Positive -
RS-stocknr. 146-0321
FabrikantnummerMIC5282YMME
FabrikantMicrochip
€ 1,049
Each (In a Tube of 100)
Aantal stuks
1.27 → 5.5 V 50mA Adjustable MSOP Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS-stocknr. 829-3443
FabrikantnummerSR086SG-G
FabrikantMicrochip
€ 0,88
Each (In a Pack of 10)
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9 → 50 V 100mA Adjustable SOIC Surface Mount 90 V 270 V 8 200mW -40 °C +125 °C 1 Positive -
RS-stocknr. 178-4926
FabrikantnummerLR645N5-G
FabrikantMicrochip
€ 0,881
Each (In a Tube of 50)
Aantal stuks
9 → 11.5 V 30mA Adjustable TO-220 Through Hole 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS-stocknr. 144-5871
FabrikantnummerSR10LG-G
FabrikantMicrochip
€ 0,35
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6 → 28 V 50mA Adjustable SOIC Surface Mount 90 V 275 V 8 - -40 °C +125 °C 1 Positive -
RS-stocknr. 829-3455
FabrikantnummerSR10LG-G
FabrikantMicrochip
€ 0,441
Each (In a Pack of 20)
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6 → 28 V 50mA Adjustable SOIC Surface Mount 90 V 275 V 8 - -40 °C +125 °C 1 Positive -
RS-stocknr. 829-3433
FabrikantnummerLR645N3-G
FabrikantMicrochip
€ 0,369
Each (In a Pack of 20)
Aantal stuks
9 → 11.5 V 30mA Adjustable TO-92 Through Hole 15 V 450 V 3 - -55 °C +150 °C 1 Positive -
RS-stocknr. 145-9146
FabrikantnummerMIC5282-5.0YMME
FabrikantMicrochip
€ 1,04
Each (In a Tube of 100)
Aantal stuks
5 V 50mA Fixed MSOP Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS-stocknr. 889-5991
FabrikantnummerLR8K4-G
FabrikantMicrochip
€ 0,622
Each (On a Reel of 2000)
Aantal stuks
1.2 → 440 V 30mA Adjustable TO-252 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS-stocknr. 165-5152
FabrikantnummerMIC5365-1.8YC5-TR
FabrikantMicrochip
€ 0,079
Each (On a Reel of 3000)
Aantal stuks
1.8 V 150mA Fixed SC-70 Surface Mount 2.5 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS-stocknr. 170-4351
FabrikantnummerLR645N3-G
FabrikantMicrochip
€ 0,316
Each (In a Bag of 1000)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 829-3257
FabrikantnummerLR8K4-G
FabrikantMicrochip
€ 0,715
Each (In a Pack of 10)
Aantal stuks
1.2 → 440 V 30mA Adjustable TO-252 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS-stocknr. 829-3421
FabrikantnummerLR12N3-G
FabrikantMicrochip
€ 0,869
Each (In a Pack of 10)
Aantal stuks
1.2 → 88 V 100mA Adjustable TO-92 Through Hole 13.2 V 100 V 3 - -40 °C +85 °C 1 Positive ±5%