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. 460-904
Mfr. Part No.LM340AT-5.0/NOPB
£1.174
Each (In a Pack of 5)
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5 V 2.4A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 168-7135
Mfr. Part No.L7812CV-DG
£0.364
Each (In a Tube of 50)
Units
12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 793-1355
Mfr. Part No.L7812CV-DG
£0.42
Each (In a Pack of 10)
Units
12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 661-6121
Mfr. Part No.LM317KCS
£0.628
Each (In a Pack of 5)
Units
1.25 37 V 1.5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 103-2162
Mfr. Part No.MC7805ABD2TG
£0.579
Each (In a Tube of 50)
Units
5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 516-5988
Mfr. Part No.MC7805ABD2TG
£0.716
Each (In a Pack of 5)
Units
5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 536-1293
Mfr. Part No.LM317LM/NOPB
£0.62
Each
Units
1.2 37 V 100mA Adjustable SOIC Surface Mount 4.2 V 40 V 8 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 168-6047
Mfr. Part No.LM217T
£0.487
Each (In a Tube of 50)
Units
1.2 37 V 1.5A Adjustable TO-220 Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS Stock No. 189-1015
Mfr. Part No.LM217T
£0.58
Each
Units
1.2 37 V 1.5A Adjustable TO-220 Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS Stock No. 102-5748
Mfr. Part No.LM317LM/NOPB
£0.533
Each (In a Tube of 95)
Units
1.2 37 V 100mA Adjustable SOIC Surface Mount 4.2 V 40 V 8 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 163-2491
Mfr. Part No.MC7905CTG
£0.371
Each (In a Tube of 50)
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-5 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 516-6199
Mfr. Part No.MC7905CTG
£0.45
Each
Units
-5 V 1A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 165-7726
Mfr. Part No.L78L33ACZ
£0.073
Each (In a Bag of 2500)
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3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 686-9616
Mfr. Part No.L78L33ACZ
£0.216
Each (In a Pack of 50)
Units
3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 168-5783
Mfr. Part No.L7805CP
£0.538
Each (In a Tube of 50)
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5 V 1.5A Fixed TO-220FP Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 296-756
Mfr. Part No.L7805CP
£2.02
Each
Units
5 V 1.5A Fixed TO-220FP Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 169-8944
Mfr. Part No.TS78L05CT A3G
£0.091
Each (On a Tape of 2000)
Units
5 V 150mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-552
Mfr. Part No.TS78L05CT A3G
£0.307
Each (In a Pack of 50)
Units
5 V 150mA Fixed TO-92 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 793-1346
Mfr. Part No.L7805CV-DG
£0.42
Each (In a Pack of 10)
Units
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 102-9429
Mfr. Part No.L7805CV-DG
£0.359
Each (In a Tube of 50)
Units
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
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STMicroelectronics L78 Series of fixed output voltage regulators ...
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STMicroelectronics L78 Series of fixed output voltage regulators are useful in a wide range of applications within the electronics Industry. The three terminal positive linear voltage regulators can remove problems that are related with single point regulation by providing local on-card regulation. The ST Regulator IC can deliver up to ...