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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RS Stock No. 516-6212
Mfr. Part No.MC7912CTG
PHP30.68
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-12 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 671-0299
Mfr. Part No.LM350T
PHP52.96
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1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 124-1691
Mfr. Part No.LM350T
PHP38.51
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1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-3488
Mfr. Part No.MC7805CTG
PHP25.869
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
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Mfr. Part No.MC78L05ACPG
PHP6.132
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 516-5758
Mfr. Part No.MC78L05ACPG
PHP23.216
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 516-6228
Mfr. Part No.MC7915CTG
PHP28.12
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-15 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 102-3491
Mfr. Part No.MC7812CTG
PHP26.15
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12 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 163-2415
Mfr. Part No.LM337TG
PHP19.46
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-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 464-104
Mfr. Part No.LM337TG
PHP32.484
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-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 806-2790
Mfr. Part No.LM317AHVT
PHP29.71
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1.2 → 57 V 1.5A TO-220 Adjustable Through Hole - 60 V 3 - 0 °C +125 °C 1 Positive -
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Mfr. Part No.LM317TG
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1.2 → 37 V 2.2A TO-220 Adjustable Through Hole -0.3 V 40 V 3 - -55 °C +150 °C 1 - -
RS Stock No. 806-4116
Mfr. Part No.MC78L05ACP
PHP13.226
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
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Mfr. Part No.KA7815ETU
PHP34.054
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15 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 178-4746
Mfr. Part No.MC7815ACTG
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15 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 170-3499
Mfr. Part No.MC78M15ACTG
PHP13.74
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15 V 700mA TO-220 Fixed Through Hole - 35 V dc 3 5W 0 °C +125 °C 1 Positive ±2%
RS Stock No. 178-4754
Mfr. Part No.NCP7815TG
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15 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 719-2774
Mfr. Part No.NCP7815TG
PHP24.842
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15 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 516-5938
Mfr. Part No.MC7805ABTG
PHP32.862
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 102-3506
Mfr. Part No.MC7805ABTG
PHP18.081
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±2%