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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Part Details Brand Stock Output Voltage Maximum Output Current Package Type Output Type Mounting Type Minimum Input Voltage Maximum Input Voltage Pin Count Power Rating Minimum Operating Temperature Maximum Operating Temperature Number of Outputs Polarity Series Dimensions Typical Dropout Voltage @ Current Height Load Regulation Line Regulation Width Quiescent Current Length Reference Voltage Dropout Voltage Measurement Current Accuracy
ON Semiconductor, 1.27 → 15 V Linear Voltage Regulator, 10mA, 1-Channel, Adjustable, ±5% 6-Pin, DFN ON Semiconductor 1000 1.27 → 15 V 10mA DFN Adjustable Surface Mount 55 V 450 V 6 - - +85 °C 1 - NCP786A 6.1 x 5.1 x 0.95mm - 0.95mm ±1 % ±0.5 % 5.1mm 15µA 6.1mm 1.27V 100 μA ±5%
ON Semiconductor, -5 V Linear Voltage Regulator, 350mA, 1-Channel Negative 4-Pin, TO-220 MC79M05CTG ON Semiconductor 0 -5 V 350mA TO-220 Fixed Through Hole -6.1 V -35 V dc 4 - 0 °C +125 °C 1 Negative MC79M00 10.28 x 4.82 x 15.75mm 1.1 V dc @ 500 mA 15.75mm 100 mV 50 mV 4.82mm - 10.28mm - 500 mA -
ON Semiconductor, -5 V Linear Voltage Regulator, 350mA, 1-Channel Negative 4-Pin, TO-220 MC79M05CTG ON Semiconductor 0 -5 V 350mA TO-220 Fixed Through Hole -6.1 V -35 V dc 4 - 0 °C +125 °C 1 Negative MC79M00 10.28 x 4.82 x 15.75mm 1.1 V dc @ 500 mA 15.75mm 100 mV 50 mV 4.82mm - 10.28mm - 500 mA -
ON Semiconductor, 1.2 → 37 V Linear Voltage Regulator, 500mA, 1-Channel, Adjustable 3 + Tab-Pin, DPAK ON Semiconductor 0 1.2 → 37 V 500mA DPAK Adjustable Surface Mount 3.1 V 40 V dc 3 + Tab - -40 °C +125 °C 1 Positive LM317M 6.73 x 6.22 x 2.25mm - 2.25mm 25 mV 0.04 %/V 6.22mm - 6.73mm 1.3V 500 mA -
ON Semiconductor, 1.2 → 37 V Linear Voltage Regulator, 500mA, 1-Channel, Adjustable 3 + Tab-Pin, DPAK ON Semiconductor 0 1.2 → 37 V 500mA DPAK Adjustable Surface Mount 3.1 V 40 V dc 3 + Tab - -40 °C +125 °C 1 Positive LM317M 6.73 x 6.22 x 2.25mm - 2.25mm 25 mV 0.04 %/V 6.22mm - 6.73mm 1.3V 500 mA -
ON Semiconductor, 1.24 → 13 V Linear Voltage Regulator, 3A, 1-Channel, Adjustable, ±2% 5-Pin, D2PAK ON Semiconductor 0 1.24 → 13 V 3A D2PAK Adjustable Surface Mount 0 V 18 V 5 - -40 °C +125 °C 1 Positive NCP59302 10.23 x 9.34 x 4.57mm 500 mV @ 3 A 4.57mm 1 % 0.5 % 9.34mm - 10.23mm 1.26V 3 A ±2%
ON Semiconductor, 1.24 → 13 V Linear Voltage Regulator, 3A, 1-Channel, Adjustable, ±2% 5-Pin, D2PAK ON Semiconductor 0 1.24 → 13 V 3A D2PAK Adjustable Surface Mount 0 V 18 V 5 - -40 °C +125 °C 1 Positive NCP59302 10.23 x 9.34 x 4.57mm 500 mV @ 3 A 4.57mm 1 % 0.5 % 9.34mm - 10.23mm 1.26V 3 A ±2%
ON Semiconductor, 1.27 → 15 V Linear Voltage Regulator, 10mA, 1-Channel, Adjustable, ±5% 6-Pin, DFN ON Semiconductor 0 1.27 → 15 V 10mA DFN Adjustable Surface Mount 55 V 450 V 6 - - +85 °C 1 - NCP786A 6.1 x 5.1 x 0.95mm - 0.95mm ±1 % ±0.5 % 5.1mm 15µA 6.1mm 1.27V 100 μA ±5%
ON Semiconductor, 1.8 V Linear Voltage Regulator, 800mA, 1-Channel, ±1% 4-Pin, SOT-223 NCP1117ST18T3G ON Semiconductor 0 1.8 V 800mA SOT-223 Fixed Surface Mount 2.4 V 20 V 4 - 0 °C +125 °C 1 Positive NCP1117 6.7 x 3.7 x 1.69mm 1.07 V @ 800 mA 1.69mm 6 mV 1 mV 3.7mm 10mA 6.7mm 1.27V 800 mA ±1%
ON Semiconductor, 1.8 V Linear Voltage Regulator, 800mA, 1-Channel, ±1% 4-Pin, SOT-223 NCP1117ST18T3G ON Semiconductor 0 1.8 V 800mA SOT-223 Fixed Surface Mount 2.4 V 20 V 4 - 0 °C +125 °C 1 Positive NCP1117 6.7 x 3.7 x 1.69mm 1.07 V @ 800 mA 1.69mm 6 mV 1 mV 3.7mm 10mA 6.7mm 1.27V 800 mA ±1%
ON Semiconductor, 12 V Linear Voltage Regulator, 40mA, 1-Channel 8-Pin, SOIC MC78L12ACDR2G ON Semiconductor 0 12 V 40mA SOIC Fixed Surface Mount 9.7 V 30 V dc 8 - 0 °C +125 °C 1 Positive MC78L00A 5 x 4 x 1.5mm 1.7 V dc @ 40 mA 1.5mm 60 mV 150 mV 4mm - 5mm - 40 mA -
ON Semiconductor, 12 V Linear Voltage Regulator, 40mA, 1-Channel 8-Pin, SOIC MC78L12ACDR2G ON Semiconductor 0 12 V 40mA SOIC Fixed Surface Mount 9.7 V 30 V dc 8 - 0 °C +125 °C 1 Positive MC78L00A 5 x 4 x 1.5mm 1.7 V dc @ 40 mA 1.5mm 60 mV 150 mV 4mm - 5mm - 40 mA -
ON Semiconductor, 24 V Linear Voltage Regulator, 350mA, 1-Channel, ±2% 4-Pin, TO-220 MC78M24CTG ON Semiconductor 0 24 V 350mA TO-220 Fixed Through Hole 26 V 40 V dc 4 - 0 °C +125 °C 1 Positive MC78M00 10.28 x 4.82 x 15.75mm 2 V dc @ 350 mA 15.75mm 100 mV 50 mV 4.82mm 0.8mA 10.28mm - 350 mA ±2%
ON Semiconductor, 24 V Linear Voltage Regulator, 350mA, 1-Channel, ±2% 4-Pin, TO-220 MC78M24CTG ON Semiconductor 0 24 V 350mA TO-220 Fixed Through Hole 26 V 40 V dc 4 - 0 °C +125 °C 1 Positive MC78M00 10.28 x 4.82 x 15.75mm 2 V dc @ 350 mA 15.75mm 100 mV 50 mV 4.82mm 0.8mA 10.28mm - 350 mA ±2%
ON Semiconductor, 8 V Linear Voltage Regulator, 350mA, 1-Channel, ±2% 4-Pin, TO-220 MC78M08CTG ON Semiconductor 0 8 V 350mA TO-220 Fixed Through Hole 10 V 35 V dc 4 - 0 °C +125 °C 1 Positive MC78M00 10.28 x 4.82 x 15.75mm 2 V dc @ 350 mA 15.75mm 100 mV 50 mV 4.82mm 0.8mA 10.28mm - 350 mA ±2%
ON Semiconductor, 8 V Linear Voltage Regulator, 350mA, 1-Channel, ±2% 4-Pin, TO-220 MC78M08CTG ON Semiconductor 0 8 V 350mA TO-220 Fixed Through Hole 10 V 35 V dc 4 - 0 °C +125 °C 1 Positive MC78M00 10.28 x 4.82 x 15.75mm 2 V dc @ 350 mA 15.75mm 100 mV 50 mV 4.82mm 0.8mA 10.28mm - 350 mA ±2%
ON Semiconductor, 8 V Linear Voltage Regulator, 40mA, 1-Channel 8-Pin, SOIC MC78L08ABDR2G ON Semiconductor 0 8 V 40mA SOIC Fixed Surface Mount 9.7 V 30 V dc 8 - -40 °C +125 °C 1 Positive MC78L00A 5 x 4 x 1.5mm 1.7 V dc @ 40 mA 1.5mm 60 mV 150 mV 4mm - 5mm - 40 mA -
ON Semiconductor, 8 V Linear Voltage Regulator, 40mA, 1-Channel 8-Pin, SOIC MC78L08ABDR2G ON Semiconductor 0 8 V 40mA SOIC Fixed Surface Mount 9.7 V 30 V dc 8 - -40 °C +125 °C 1 Positive MC78L00A 5 x 4 x 1.5mm 1.7 V dc @ 40 mA 1.5mm 60 mV 150 mV 4mm - 5mm - 40 mA -
Analog Devices, 3.3 V Linear Voltage Regulator, 200mA, 1-Channel, ±2% 4-Pin, WLCSP ADP151ACBZ-3.3-R7 Analog Devices 6000 3.3 V 200mA WLCSP Fixed Surface Mount 2.2 V 5.5 V 4 - -40 °C +125 °C 1 - - 0.8 x 0.8 x 0.66mm 135 mV @ 200 mA 0.66mm 0.009 %/mA ±0.5 %/V 0.8mm 256µA 0.8mm - 200 mA ±2%
Analog Devices, 1.2 V Linear Voltage Regulator, 500mA, 1-Channel, ±3% 8-Pin, MSOP ADP1715ARMZ-1.2-R7 Analog Devices 1855 1.2 V 500mA MSOP Fixed Surface Mount 2.5 V 5.5 V 8 - -40 °C +125 °C 1 - - 3.2 x 3.2 x 0.95mm 320 mV @ 500 mA 0.95mm 0.004 %/mA ±0.15 %/V 3.2mm - 3.2mm - 500 mA ±3%
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