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. 168-8786
FabrikantnummerLM317BT
€ 0,507
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. 189-1295
FabrikantnummerL78L05ACZ
€ 2,22
Each
Aantal stuks
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
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. 168-6586
FabrikantnummerLM317P
€ 0,722
Each (In a Tube of 50)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220FP Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 516-4929
FabrikantnummerMC78M08CDTG
FabrikantON Semiconductor
€ 1,10
Each
Aantal stuks
8 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 921-5324
FabrikantnummerLM337IMP/NOPB
€ 0,69
Each (On a Reel of 1000)
Aantal stuks
-1.2 → -37 V 1.5A Adjustable SOT-223 Surface Mount -4.2 V -40 V 3+Tab - -40 °C +125 °C 1 Negative -
RS-stocknr. 168-6049
FabrikantnummerL78L05ACZ
€ 0,086
Each (In a Bag of 2500)
Aantal stuks
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS-stocknr. 686-9757
FabrikantnummerL78S10CV
€ 0,581
Each (In a Pack of 10)
Aantal stuks
10 V 2A Fixed TO-220 Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 298-8558
FabrikantnummerL7815CV
€ 2,22
Each
Aantal stuks
15 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 168-6576
FabrikantnummerL78L15ABUTR
€ 0,129
Each (On a Reel of 2500)
Aantal stuks
15 V 100mA Fixed SOT-89 Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 533-8209
FabrikantnummerLM317T/NOPB
€ 2,21
Each
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 168-6595
FabrikantnummerL78S10CV
€ 0,528
Each (In a Tube of 50)
Aantal stuks
10 V 2A Fixed TO-220 Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 686-9489
FabrikantnummerL78L15ABUTR
€ 0,313
Each (In a Pack of 25)
Aantal stuks
15 V 100mA Fixed SOT-89 Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 516-5269
FabrikantnummerLM337BTG
FabrikantON Semiconductor
€ 2,20
Each
Aantal stuks
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - -40 °C +125 °C 1 Negative -
RS-stocknr. 168-6061
FabrikantnummerL7815CV
€ 0,367
Each (In a Tube of 50)
Aantal stuks
15 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 516-6183
FabrikantnummerMC7818CTG
FabrikantON Semiconductor
€ 2,20
Each
Aantal stuks
18 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 163-2414
FabrikantnummerLM337BTG
FabrikantON Semiconductor
€ 0,609
Each (In a Tube of 50)
Aantal stuks
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - -40 °C +125 °C 1 Negative -
RS-stocknr. 125-0052
FabrikantnummerMC7818CTG
FabrikantON Semiconductor
€ 0,302
Each (In a Tube of 50)
Aantal stuks
18 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 100-5905
FabrikantnummerLM317T/NOPB
€ 1,412
Each (In a Tube of 45)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 125-0053
FabrikantnummerMC7824ACTG
FabrikantON Semiconductor
€ 0,41
Each (In a Tube of 50)
Aantal stuks
24 V 1A Fixed TO-220 Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
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