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. 918-1971
FabrikantnummerL7805CV
€ 0,367
Each (In a Tube of 50)
Aantal stuks
5 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 714-0792
FabrikantnummerLM317T
€ 0,51
Each (In a Pack of 10)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 168-6809
FabrikantnummerLM317T
€ 0,464
Each (In a Tube of 50)
Aantal stuks
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 918-1975
FabrikantnummerL7812CV
€ 0,334
Each (In a Tube of 50)
Aantal stuks
12 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 298-8542
FabrikantnummerL7812CV
€ 0,44
Each
Aantal stuks
12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 714-0675
FabrikantnummerL78L05ABUTR
€ 0,345
Each (In a Pack of 10)
Aantal stuks
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 168-6798
FabrikantnummerL78L05ABUTR
€ 0,118
Each (On a Reel of 2500)
Aantal stuks
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 168-7135
FabrikantnummerL7812CV-DG
€ 0,42
Each (In a Tube of 50)
Aantal stuks
12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-stocknr. 793-1355
FabrikantnummerL7812CV-DG
€ 0,462
Each (In a Pack of 10)
Aantal stuks
12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS-stocknr. 168-6803
FabrikantnummerL7912CV
€ 0,361
Each (In a Tube of 50)
Aantal stuks
-12 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS-stocknr. 714-0694
FabrikantnummerL7912CV
€ 0,392
Each (In a Pack of 10)
Aantal stuks
-12 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS-stocknr. 168-6062
FabrikantnummerL7824CV
€ 0,334
Each (In a Tube of 50)
Aantal stuks
24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 298-8564
FabrikantnummerL7824CV
€ 2,22
Each
Aantal stuks
24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS-stocknr. 655-644
FabrikantnummerCSR2-15E
€ 38,34
Each
Aantal stuks
230 V 15A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS-stocknr. 761-5621
FabrikantnummerLM317AEMP/NOPB
€ 1,93
Each (In a Pack of 5)
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 Positive ±1%
RS-stocknr. 463-767
FabrikantnummerMC7805CD2TG
FabrikantON Semiconductor
€ 0,492
Each (In a Pack of 10)
Aantal stuks
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 102-1392
FabrikantnummerMC7805CD2TG
FabrikantON Semiconductor
€ 0,441
Each (In a Tube of 50)
Aantal stuks
5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 661-6737
FabrikantnummerUA78M33CKCS
€ 0,738
Each (In a Pack of 5)
Aantal stuks
3.3 V 500mA Fixed TO-220 Through Hole 5.3 V 25 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 921-6894
FabrikantnummerLM317AEMP/NOPB
€ 0,733
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 Positive ±1%
RS-stocknr. 806-2790
FabrikantnummerLM317AHVT
FabrikantON Semiconductor
€ 0,636
Each (In a Tube of 50)
Aantal stuks
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole - 60 V 3 - 0 °C +125 °C 1 Positive -
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