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. 168-6797
FabrikantnummerL7809CV
€ 0,334
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9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS-stocknr. 168-6059
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€ 0,42
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5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS-stocknr. 829-3266
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FabrikantMicrochip
€ 0,461
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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. 145-7768
FabrikantnummerUA78L10ACLP
€ 0,153
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10 V 100mA Fixed TO-92 Through Hole 12.5 V 25 V 3 - 0 °C +125 °C 1 Positive ±5%
RS-stocknr. 922-2417
FabrikantnummerTPS7A4901DGNT
€ 1,80
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33 V 150mA Adjustable MSOP Surface Mount 3 V 36 V 8 - -40 °C +150 °C 1 Positive 2.5%
RS-stocknr. 796-8433
FabrikantnummerTPS7A4901DGNT
€ 2,59
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33 V 150mA Adjustable MSOP Surface Mount 3 V 36 V 8 - -40 °C +150 °C 1 Positive 2.5%
RS-stocknr. 714-0666
FabrikantnummerL7809CV
€ 0,367
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9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS-stocknr. 298-8508
FabrikantnummerL7805ACV
€ 2,22
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5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS-stocknr. 785-6986
FabrikantnummerMC7824ACTG
FabrikantON Semiconductor
€ 0,451
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24 V 1A Fixed TO-220 Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS-stocknr. 168-6569
FabrikantnummerL7812CD2T-TR
€ 0,27
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12 V 1.5A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 516-4963
FabrikantnummerLM317LBDG
FabrikantON Semiconductor
€ 2,20
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount - - 8 - -40 °C +125 °C 1 Positive ±4%
RS-stocknr. 686-9350
FabrikantnummerL7812CD2T-TR
€ 0,513
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12 V 1.5A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 125-0053
FabrikantnummerMC7824ACTG
FabrikantON Semiconductor
€ 0,41
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24 V 1A Fixed TO-220 Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS-stocknr. 124-9985
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FabrikantON Semiconductor
€ 0,341
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount - - 8 - -40 °C +125 °C 1 Positive ±4%
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FabrikantnummerUA78L10ACLP
€ 0,328
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10 V 100mA Fixed TO-92 Through Hole 12.5 V 25 V 3 - 0 °C +125 °C 1 Positive ±5%
RS-stocknr. 751-3102
FabrikantnummerAP7333-33SAG-7
FabrikantDiodesZetex
€ 0,28
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3.3 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS-stocknr. 922-8317
FabrikantnummerAP7333-33SAG-7
FabrikantDiodesZetex
€ 0,098
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3.3 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS-stocknr. 168-6573
FabrikantnummerL78L06ABZ
€ 0,097
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6 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 170-4344
FabrikantnummerLR8N3-G
FabrikantMicrochip
€ 0,411
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- - - - - - - - - - - - - -
RS-stocknr. 686-9439
FabrikantnummerL78L06ABZ
€ 0,255
Each (In a Pack of 25)
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6 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
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