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. 145-3371
FabrikantnummerMC7812BDTG
FabrikantON Semiconductor
€ 0,399
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12 V 1A Fixed DPAK Surface Mount - 40 V 3 15W -40 °C +125 °C 1 Positive -
RS-stocknr. 122-0380
FabrikantnummerAP7313-33SRG-7
FabrikantDiodesZetex
€ 0,097
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3.3 V 150mA Fixed SOT-23R Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS-stocknr. 124-9986
FabrikantnummerLM317LDR2G
FabrikantON Semiconductor
€ 0,075
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount 4.2 V - 8 - 0 °C +125 °C 1 Positive ±4%
RS-stocknr. 686-9426
FabrikantnummerL78L33ACUTR
€ 0,345
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3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 686-9603
FabrikantnummerL78L05ACD13TR
€ 0,302
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5 V 100mA Fixed SOIC Surface Mount - 30 V 8 - 0 °C +150 °C 1 Positive ±5%
RS-stocknr. 686-9237
FabrikantnummerLM217LD13TR
€ 0,334
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Aantal stuks
1.2 → 37 V 200mA Adjustable SOIC Surface Mount - - 8 - -40 °C +125 °C 1 Positive -
RS-stocknr. 178-4803
FabrikantnummerMC79M05CDTG
FabrikantON Semiconductor
€ 0,356
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-5 V 500mA Fixed DPAK Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS-stocknr. 163-2488
FabrikantnummerMC78M05CDTRKG
FabrikantON Semiconductor
€ 0,118
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5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS-stocknr. 162-6232
FabrikantnummerLM340LAZ-5.0/NOPB
€ 0,317
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5 V 100mA Fixed TO-92 Through Hole 7.5 V 35 V 3 - 0 °C +70 °C 1 Positive ±3%
RS-stocknr. 906-4687
FabrikantnummerSTLQ015M33R
€ 0,55
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3.3 V 150mA Fixed SOT-23 Surface Mount 1.5 V 5.5 V 5 - -40 °C +85 °C 1 Positive ±20mV
RS-stocknr. 102-5748
FabrikantnummerLM317LM/NOPB
€ 0,571
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1.2 → 37 V 100mA Adjustable SOIC Surface Mount 4.2 V 40 V 8 0.625W -40 °C +125 °C 1 Positive -
RS-stocknr. 686-9726
FabrikantnummerL7805ABP
€ 0,679
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5 V 1A Fixed TO-220FP Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS-stocknr. 806-2857
FabrikantnummerLM7810CT
FabrikantON Semiconductor
€ 0,539
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10 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 178-5150
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€ 0,086
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- - - - - - - - - - - - - -
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FabrikantnummerLP2998MR/NOPB
€ 1,662
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- 1.5A Adjustable PSOP Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
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FabrikantnummerLM217MDT-TR
€ 0,712
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1.2 → 37 V 200mA Adjustable DPAK Surface Mount 3 V - 3 - -40 °C +125 °C 1 Positive -
RS-stocknr. 178-5063
FabrikantnummerLM317D2T-TR
€ 0,334
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- - - - - - - - - - - - - -
RS-stocknr. 163-2415
FabrikantnummerLM337TG
FabrikantON Semiconductor
€ 0,507
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Aantal stuks
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS-stocknr. 536-1293
FabrikantnummerLM317LM/NOPB
€ 2,21
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Aantal stuks
1.2 → 37 V 100mA Adjustable SOIC Surface Mount 4.2 V 40 V 8 0.625W -40 °C +125 °C 1 Positive -
RS-stocknr. 686-9300
FabrikantnummerL78M12ABDT-TR
€ 0,464
Each (In a Pack of 25)
Aantal stuks
12 V 500mA Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
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