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. 686-9754
FabrikantnummerL7915CP
0,603 €
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-15 V 1.5A Fixed TO-220FP Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS-stocknr. 169-8179
FabrikantnummerNJM7809DL1A-TE1
FabrikantNew Japan Radio
0,316 €
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9 V 1.5A Fixed TO-252 Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS-stocknr. 533-5840
FabrikantnummerLM350AT/NOPB
2,69 €
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1.2 → 33 V 3A Adjustable TO-220 Through Hole 4.2 V 35 V 3 25W -40 °C +125 °C 1 Positive ±1%
RS-stocknr. 686-9464
FabrikantnummerL78L33ABUTR
0,306 €
Each (In a Pack of 25)
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3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 860-7286
FabrikantnummerLM317BT
0,558 €
Each (In a Pack of 10)
Aantal stuks
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 884-2552
FabrikantnummerLT1033CT#PBF
FabrikantAnalog Devices
6,06 €
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Aantal stuks
-1.2 → -32 V 3A Adjustable TO-220 Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS-stocknr. 714-7783
FabrikantnummerL78S12CV
0,516 €
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Aantal stuks
12 V 2A Fixed TO-220 Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 806-7168
FabrikantnummerKA7806ETU
FabrikantON Semiconductor
0,182 €
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6 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 102-3488
FabrikantnummerMC7805CTG
FabrikantON Semiconductor
0,304 €
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Aantal stuks
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 178-5144
FabrikantnummerL78L33ABUTR
0,118 €
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Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 686-9603
FabrikantnummerL78L05ACD13TR
0,281 €
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5 V 100mA Fixed SOIC Surface Mount - 30 V 8 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 713-9477
FabrikantnummerNJM7809DL1A-TE1
FabrikantNew Japan Radio
0,532 €
Each (In a Pack of 5)
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9 V 1.5A Fixed TO-252 Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS-stocknr. 785-2372
FabrikantnummerMC7924BTG
FabrikantON Semiconductor
0,405 €
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-24 V 1A Fixed TO-220 Through Hole - -40 V dc 3 15W -40 °C +125 °C 1 Negative -
RS-stocknr. 178-1481
FabrikantnummerL7915CP
0,603 €
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Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 168-6797
FabrikantnummerL7809CV
0,311 €
Each (In a Tube of 50)
Aantal stuks
9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS-stocknr. 168-8786
FabrikantnummerLM317BT
0,362 €
Each (In a Tube of 50)
Aantal stuks
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 686-9552
FabrikantnummerL78L33ABZ-AP
0,23 €
Each (In a Pack of 25)
Aantal stuks
3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 145-2811
FabrikantnummerMC78L15ACDG
FabrikantON Semiconductor
0,235 €
Each (In a Tube of 98)
Aantal stuks
15 V 100mA Fixed SOIC Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive -
RS-stocknr. 100-3967
FabrikantnummerLM317LZ/NOPB
0,249 €
Each (On a Reel of 1800)
Aantal stuks
1.2 → 37 V 100mA Adjustable TO-92 Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS-stocknr. 714-7812
FabrikantnummerPB137ACV
1,222 €
Each (In a Pack of 5)
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13.7 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive ±1%
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