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. 168-6809
Mfr. Part No.LM317T
£0.382
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. 714-0792
Mfr. Part No.LM317T
£0.42
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. 918-1971
Mfr. Part No.L7805CV
£0.305
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. 460-900
Mfr. Part No.LM338T/NOPB
£1.624
Each (In a Pack of 5)
Units
1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
£1.32
Each (In a Tube of 45)
Units
1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
£2.02
Each
Units
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
£0.402
Each (In a Tube of 50)
Units
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 714-7768
Mfr. Part No.L78L05ACZTR
£0.24
Each (In a Pack of 25)
Units
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 189-1295
Mfr. Part No.L78L05ACZ
£2.02
Each
Units
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 102-3529
Mfr. Part No.L78L05ACZTR
£0.078
Each (On a Reel of 2000)
Units
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 168-6049
Mfr. Part No.L78L05ACZ
£0.078
Each (In a Bag of 2500)
Units
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 661-6737
Mfr. Part No.UA78M33CKCS
£0.644
Each (In a Pack of 5)
Units
3.3 V 500mA Fixed TO-220 Through Hole 5.3 V 25 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6797
Mfr. Part No.L7809CV
£0.393
Each (In a Tube of 50)
Units
9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 714-0666
Mfr. Part No.L7809CV
£0.397
Each (In a Pack of 10)
Units
9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 298-8558
Mfr. Part No.L7815CV
£2.02
Each
Units
15 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 124-1691
Mfr. Part No.LM350T
£0.539
Each (In a Tube of 50)
Units
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 671-0299
Mfr. Part No.LM350T
£0.618
Each (In a Pack of 5)
Units
1.2 → 33 V 3A Adjustable TO-220AB Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6061
Mfr. Part No.L7815CV
£0.304
Each (In a Tube of 50)
Units
15 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
£1.02
Each (In a Tube of 45)
Units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
£2.01
Each
Units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
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