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. 661-6730
Mfr. Part No.UA78M05IDCY
£0.658
Each (In a Pack of 5)
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5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 686-9751
Mfr. Part No.L78S09CV
£0.542
Each (In a Pack of 10)
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9 V 2A Fixed TO-220 Through Hole 12 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 921-6910
Mfr. Part No.LM340MP-5.0/NOPB
£0.466
Each (On a Reel of 1000)
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5 V 1A Fixed SOT-223 Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 124-1351
Mfr. Part No.LM78L05ACZ
£0.079
Each (In a Bag of 1000)
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5 V 100mA Fixed TO-92 Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 145-8603
Mfr. Part No.L78S09CV
£0.451
Each (In a Tube of 50)
Units
9 V 2A Fixed TO-220 Through Hole 12 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 761-5680
Mfr. Part No.LM340MP-5.0/NOPB
£1.06
Each (In a Pack of 5)
Units
5 V 1A Fixed SOT-223 Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 102-3491
Mfr. Part No.MC7812CTG
£0.342
Each (In a Tube of 50)
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12 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 516-4806
Mfr. Part No.MC7808CTG
£2.00
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8 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 102-3489
Mfr. Part No.MC7808CTG
£0.396
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8 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 168-7135
Mfr. Part No.L7812CV-DG
£0.371
Each (In a Tube of 50)
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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
£0.447
Each (In a Pack of 10)
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12 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 460-904
Mfr. Part No.LM340AT-5.0/NOPB
£1.192
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. 100-0720
Mfr. Part No.LM340AT-5.0/NOPB
£0.99
Each (In a Tube of 45)
Units
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. 661-6121
Mfr. Part No.LM317KCS
£0.654
Each (In a Pack of 5)
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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. 162-5911
Mfr. Part No.TL780-05KCS
£0.537
Each (In a Tube of 50)
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5 V 1.5A Fixed TO-220 Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive ±1%
RS Stock No. 103-2162
Mfr. Part No.MC7805ABD2TG
£0.56
Each (In a Tube of 50)
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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
£0.662
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. 661-6226
Mfr. Part No.TL780-05KCS
£0.726
Each (In a Pack of 5)
Units
5 V 1.5A Fixed TO-220 Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive ±1%
RS Stock No. 536-1293
Mfr. Part No.LM317LM/NOPB
£2.01
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. 189-1015
Mfr. Part No.LM217T
£2.02
Each
Units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole - - 3 - -25 °C +150 °C 1 Positive -
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