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. 102-1392
FabrikantnummerMC7805CD2TG
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€ 0,485
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5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 463-767
FabrikantnummerMC7805CD2TG
FabrikantON Semiconductor
€ 0,534
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5 V 1A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 124-1691
FabrikantnummerLM350T
FabrikantON Semiconductor
€ 0,959
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1.2 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 806-2790
FabrikantnummerLM317AHVT
FabrikantON Semiconductor
€ 0,636
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1.2 57 V 1.5A Adjustable TO-220 Through Hole - 60 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 163-2478
FabrikantnummerMC7805CDTRKG
FabrikantON Semiconductor
€ 0,15
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Aantal stuks
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 688-9253
FabrikantnummerMC7805CDTRKG
FabrikantON Semiconductor
€ 0,45
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5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 516-4929
FabrikantnummerMC78M08CDTG
FabrikantON Semiconductor
€ 1,10
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8 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 178-4802
FabrikantnummerMC78M08CDTG
FabrikantON Semiconductor
€ 0,305
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8 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 125-0052
FabrikantnummerMC7818CTG
FabrikantON Semiconductor
€ 0,302
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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
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-37 -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - -40 °C +125 °C 1 Negative -
RS-stocknr. 516-6183
FabrikantnummerMC7818CTG
FabrikantON Semiconductor
€ 2,20
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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
€ 2,20
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-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
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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
FabrikantnummerLM317LBDG
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%
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. 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. 805-6470
FabrikantnummerMC7805BDTRKG
FabrikantON Semiconductor
€ 0,406
Each (In a Pack of 25)
Aantal stuks
5 V 2.2A Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 806-0987
FabrikantnummerNCV553SQ50T1G
FabrikantON Semiconductor
€ 0,267
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5 V 80mA Fixed SC-82AB Surface Mount - 12 V 4 - -40 °C +125 °C 1 Positive 2%
RS-stocknr. 166-2166
FabrikantnummerKA7915ATU
FabrikantON Semiconductor
€ 0,34
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-15 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±2%
RS-stocknr. 719-2768
FabrikantnummerNCP7805TG
FabrikantON Semiconductor
€ 0,451
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5 V 1A Fixed TO-220 Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%