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 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 stock no. 796-9183
Mfr. Part No.ADP123AUJZ-R7
R 13.77
Each (In a Pack of 10)
units
0.8 → 5 V 300mA Adjustable TSOT Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±1%
RS stock no. 912-8078
Mfr. Part No.ADP123AUJZ-R7
R 8.283
Each (On a Reel of 3000)
units
0.8 → 5 V 300mA Adjustable TSOT Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±1%
RS stock no. 157-8360
Mfr. Part No.LT1033CT#PBF
R 65.867
Each (In a Tube of 50)
units
-1.2 → -32 V 3A Adjustable TO-220 Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS stock no. 884-2552
Mfr. Part No.LT1033CT#PBF
R 101.51
Each (In a Pack of 2)
units
-1.2 → -32 V 3A Adjustable TO-220 Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS stock no. 155-5383
Mfr. Part No.LT317AT#PBF
R 51.955
Each (In a Tube of 50)
units
5 → 40 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 779-9628
Mfr. Part No.LT317AT#PBF
R 69.83
Each (In a Pack of 2)
units
5 → 40 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 759-1809
Mfr. Part No.ADP2108AUJZ-3.3-R7
R 35.378
Each (In a Pack of 5)
units
3.3 V 600mA Fixed TSOT Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS stock no. 912-9696
Mfr. Part No.ADP2108AUJZ-3.3-R7
R 14.958
Each (On a Reel of 3000)
units
3.3 V 600mA Fixed TSOT Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS stock no. 742-7691
Mfr. Part No.ADP150AUJZ-3.3-R7
R 16.248
Each (In a Pack of 5)
units
3.3 V 150mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS stock no. 912-9589
Mfr. Part No.ADP150AUJZ-3.3-R7
R 7.575
Each (On a Reel of 3000)
units
3.3 V 150mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS stock no. 912-9624
Mfr. Part No.ADP151AUJZ-3.3-R7
R 6.826
Each (On a Reel of 3000)
units
3.3 V 200mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2.5%
RS stock no. 159-9544
Mfr. Part No.ADM7151ARDZ-04
R 92.424
Each (In a Tube of 98)
units
1.5 → 5.1 V 800mA Adjustable SOIC Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS stock no. 798-9950
Mfr. Part No.ADM7151ARDZ-04
R 156.49
Each
units
1.5 → 5.1 V 800mA Adjustable SOIC Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS stock no. 822-6654
Mfr. Part No.LT3015IDD#PBF
R 102.01
Each
units
-1.22 → -29.3 V 1.5A Adjustable DFN Surface Mount -1.8 V -30 V 8 - -40 °C +125 °C 1 Negative -
RS stock no. 155-7544
Mfr. Part No.LT3015IDD#PBF
R 68.43
Each (In a Tube of 121)
units
-1.22 → -29.3 V 1.5A Adjustable DFN Surface Mount -1.8 V -30 V 8 - -40 °C +125 °C 1 Negative -
RS stock no. 742-7764
Mfr. Part No.ADP151AUJZ-3.3-R7
R 8.65
Each
units
3.3 V 200mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2.5%
RS stock no. 159-9540
Mfr. Part No.ADM7150ARDZ-2.8
R 73.176
Each (In a Tube of 98)
units
2.8 V 800mA Fixed SOIC Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS stock no. 822-9921
Mfr. Part No.LT3015EQ#PBF
R 110.23
Each
units
-1.22 → -29.3 V 1.5A Adjustable D2PAK Surface Mount -1.8 V -30 V 5 - -40 °C +125 °C 1 Negative -
RS stock no. 159-8049
Mfr. Part No.ADP150AUJZ-2.5-R7
R 6.475
Each (On a Reel of 3000)
units
2.5 V 150mA Fixed TSOT Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS stock no. 159-9541
Mfr. Part No.ADM7150ARDZ-3.0
R 73.176
Each (In a Tube of 98)
units
3 V 800mA Fixed SOIC Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%