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. 298-8514
Mfr. Part No.L7805CV
R 7.98
Each
units
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS stock no. 918-1971
Mfr. Part No.L7805CV
R 3.887
Each (In a Tube of 50)
units
5 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 714-0792
Mfr. Part No.LM317T
R 5.218
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 168-6809
Mfr. Part No.LM317T
R 7.374
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 686-9552
Mfr. Part No.L78L33ABZ-AP
R 4.679
Each (In a Pack of 25)
units
3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 168-6578
Mfr. Part No.L78L33ABZ-AP
R 1.30
Each (On a Tape of 2000)
units
3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 918-1975
Mfr. Part No.L7812CV
R 3.777
Each (In a Tube of 50)
units
12 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 165-7768
Mfr. Part No.L79L05ABD13TR
R 1.692
Each (On a Reel of 2500)
units
-5 V 100mA Fixed SOIC Surface Mount - -30 V 8 - -40 °C +125 °C 1 Negative -
RS stock no. 686-9492
Mfr. Part No.L79L05ABD13TR
R 4.667
Each (In a Pack of 25)
units
-5 V 100mA Fixed SOIC Surface Mount - -30 V 8 - -40 °C +125 °C 1 Negative -
RS stock no. 178-5130
Mfr. Part No.L78M09ABDT-TR
R 2.788
Each (On a Reel of 2500)
units
9 V 500mA Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS stock no. 370-9637
Mfr. Part No.L200CV
R 44.192
Each (In a Tube of 50)
units
2.85 → 36 V 2A Adjustable PENTAWATT Through Hole 8 V 18 V 5 - -25 °C +150 °C 1 Positive -
RS stock no. 168-6798
Mfr. Part No.L78L05ABUTR
R 1.715
Each (On a Reel of 2500)
units
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 714-0675
Mfr. Part No.L78L05ABUTR
R 4.483
Each (In a Pack of 10)
units
5 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 686-9307
Mfr. Part No.L78M09ABDT-TR
R 4.544
Each (In a Pack of 25)
units
9 V 500mA Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS stock no. 686-9717
Mfr. Part No.LM317P
R 13.405
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A Adjustable TO-220FP Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS stock no. 168-6586
Mfr. Part No.LM317P
R 11.564
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A Adjustable TO-220FP Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS stock no. 165-7754
Mfr. Part No.L78L33ACUTR
R 1.875
Each (On a Reel of 2500)
units
3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS stock no. 686-9426
Mfr. Part No.L78L33ACUTR
R 3.228
Each (In a Pack of 25)
units
3.3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS stock no. 168-6572
Mfr. Part No.L7815CD2T-TR
R 5.774
Each (On a Reel of 1000)
units
15 V 1.5A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS stock no. 686-9397
Mfr. Part No.L7815CD2T-TR
R 9.727
Each (In a Pack of 10)
units
15 V 1.5A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -