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. 463-767
FabrikantnummerMC7805CD2TG
FabrikantON Semiconductor
€ 0,492
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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
€ 0,461
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. 806-2790
FabrikantnummerLM317AHVT
FabrikantON Semiconductor
€ 0,617
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 -
RS-stocknr. 169-8722
FabrikantnummerLM317LZX
FabrikantON Semiconductor
€ 0,088
Each (On a Reel of 2000)
Aantal stuks
1.2 → 37 V 200mA Adjustable TO-92 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 806-4661
FabrikantnummerLM317LZX
FabrikantON Semiconductor
€ 0,246
Each (In a Pack of 50)
Aantal stuks
1.2 → 37 V 200mA Adjustable TO-92 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 761-3537
FabrikantnummerLM317LZ
FabrikantON Semiconductor
€ 0,274
Each (In a Pack of 25)
Aantal stuks
1.2 → 37 V 100mA Adjustable TO-92 Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 124-1691
FabrikantnummerLM350T
FabrikantON Semiconductor
€ 0,688
Each (In a Tube of 50)
Aantal stuks
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 671-0299
FabrikantnummerLM350T
FabrikantON Semiconductor
€ 0,922
Each (In a Pack of 5)
Aantal stuks
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 124-1350
FabrikantnummerLM317LZ
FabrikantON Semiconductor
€ 0,093
Each (In a Bag of 1000)
Aantal stuks
1.2 → 37 V 100mA Adjustable TO-92 Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 688-9253
FabrikantnummerMC7805CDTRKG
FabrikantON Semiconductor
€ 0,50
Each (In a Pack of 2)
Aantal stuks
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 163-2478
FabrikantnummerMC7805CDTRKG
FabrikantON Semiconductor
€ 0,167
Each (On a Reel of 2500)
Aantal stuks
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 178-4802
FabrikantnummerMC78M08CDTG
FabrikantON Semiconductor
€ 0,294
Each (In a Tube of 75)
Aantal stuks
8 V 700mA Fixed DPAK Surface Mount - 35 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. 166-3597
FabrikantnummerKA78L08AMTF
FabrikantON Semiconductor
€ 0,136
Each (On a Reel of 4000)
Aantal stuks
8 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 0.75W 0 °C +125 °C 1 - -
RS-stocknr. 163-2414
FabrikantnummerLM337BTG
FabrikantON Semiconductor
€ 0,647
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. 807-8837
FabrikantnummerKA78L08AMTF
FabrikantON Semiconductor
€ 0,301
Each (In a Pack of 25)
Aantal stuks
8 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 0.75W 0 °C +125 °C 1 - -
RS-stocknr. 125-0052
FabrikantnummerMC7818CTG
FabrikantON Semiconductor
€ 0,294
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. 516-6183
FabrikantnummerMC7818CTG
FabrikantON Semiconductor
€ 0,37
Each
Aantal stuks
18 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 516-5269
FabrikantnummerLM337BTG
FabrikantON Semiconductor
€ 1,10
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. 785-6986
FabrikantnummerMC7824ACTG
FabrikantON Semiconductor
€ 0,451
Each (In a Pack of 10)
Aantal stuks
24 V 1A Fixed TO-220 Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -