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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Description Price 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 Accuracy
RS Stock No. 714-0792
Mfr. Part No.LM317T
TWD17.70
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6809
Mfr. Part No.LM317T
TWD16.90
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-3967
Mfr. Part No.LM317LZ/NOPB
TWD8.70
Each (On a Reel of 1800)
units
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 533-5711
Mfr. Part No.LM317LZ/NOPB
TWD23.00
Each
units
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 742-7691
Mfr. Part No.ADP150AUJZ-3.3-R7
TWD35.00
Each (In a Pack of 5)
units
3.3 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 918-1975
Mfr. Part No.L7812CV
TWD11.60
Each (In a Tube of 50)
units
12 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 912-9589
Mfr. Part No.ADP150AUJZ-3.3-R7
TWD14.70
Each (On a Reel of 3000)
units
3.3 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 169-8951
Mfr. Part No.TS78M05CP ROG
TWD7.60
Each (On a Reel of 2500)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-647
Mfr. Part No.TS78M05CP ROG
TWD18.70
Each (In a Pack of 50)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 535-9997
Mfr. Part No.LM78L15ACZ/NOPB
TWD23.20
Each (In a Pack of 5)
units
15 V 100mA TO-92 Fixed Through Hole 16.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 121-9159
Mfr. Part No.LM317DCY
TWD19.00
Each (In a Tube of 80)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 661-3627
Mfr. Part No.LM317DCYR
TWD20.00
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 661-6128
Mfr. Part No.LM317DCY
TWD24.00
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 102-5719
Mfr. Part No.LM78L15ACZ/NOPB
TWD8.70
Each (On a Reel of 1800)
units
15 V 100mA TO-92 Fixed Through Hole 16.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 756-2801
Mfr. Part No.TA48M05F(T6L1,SNQ)
BrandToshiba
TWD42.20
Each (In a Pack of 5)
units
5.25 V 500mA HSOP Fixed Surface Mount 7 V 29 V 3 - -40 °C +150 °C 1 Positive ±5%
RS Stock No. 100-0703
Mfr. Part No.LM340T-15/NOPB
TWD43.60
Each (In a Tube of 45)
units
15 V 1A TO-220 Fixed Through Hole 17.7 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 460-764
Mfr. Part No.LM340T-15/NOPB
TWD66.80
Each (In a Pack of 5)
units
15 V 1A TO-220 Fixed Through Hole 17.7 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 298-8558
Mfr. Part No.L7815CV
TWD17.00
Each
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
TWD57.60
Each (In a Tube of 45)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 918-1971
Mfr. Part No.L7805CV
TWD12.80
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -