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 Package Type Output 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
PHP24.174
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 714-0792
Mfr. Part No.LM317T
PHP25.166
Each (In a Pack of 10)
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
PHP85.956
Each (In a Tube of 45)
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1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 460-900
Mfr. Part No.LM338T/NOPB
PHP101.646
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1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
PHP25.004
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5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 516-6212
Mfr. Part No.MC7912CTG
PHP29.04
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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. 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
PHP17.422
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
PHP75.51
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
PHP63.013
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
PHP28.08
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
PHP23.117
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 686-9303
Mfr. Part No.L78M05ABDT-TR
PHP21.612
Each (In a Pack of 25)
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5 V 500mA DPAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 165-7435
Mfr. Part No.L78M05ABDT-TR
PHP9.82
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5 V 500mA DPAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 527-974
Mfr. Part No.UA78L05ACDR
PHP6.762
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5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 661-6709
Mfr. Part No.UA78L05ACD
PHP17.831
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5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 516-5758
Mfr. Part No.MC78L05ACPG
PHP22.088
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-3501
Mfr. Part No.MC78L05ACPG
PHP6.11
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 714-7780
Mfr. Part No.L78S05CV
PHP28.282
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5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 102-3530
Mfr. Part No.L78S05CV
PHP28.016
Each (In a Tube of 50)
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5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
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