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. 918-1971
Mfr. Part No.L7805CV
$0.727
Each (In a Tube of 50)
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5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6809
Mfr. Part No.LM317T
$0.929
Each (In a Tube of 50)
units
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
$0.927
Each (In a Pack of 10)
units
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
$3.146
Each (In a Tube of 45)
units
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
$3.706
Each (In a Pack of 5)
units
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. 189-1295
Mfr. Part No.L78L05ACZ
$0.67
Each
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 168-6049
Mfr. Part No.L78L05ACZ
$0.155
Each (In a Bag of 2500)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 661-3621
Mfr. Part No.LM317KTTR
$1.24
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A D2PAK (TO-263) Adjustable Surface Mount 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-3529
Mfr. Part No.L78L05ACZTR
$0.165
Each (On a Reel of 2000)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 714-7768
Mfr. Part No.L78L05ACZTR
$0.539
Each (In a Pack of 25)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 533-5711
Mfr. Part No.LM317LZ/NOPB
$1.22
Each
units
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 100-3967
Mfr. Part No.LM317LZ/NOPB
$0.445
Each (On a Reel of 1800)
units
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 178-1481
Mfr. Part No.L7915CP
$1.20
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 168-6062
Mfr. Part No.L7824CV
$0.66
Each (In a Tube of 50)
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24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 121-9570
Mfr. Part No.ZLDO1117G50TA
$0.281
Each (On a Reel of 1000)
units
5 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 686-9754
Mfr. Part No.L7915CP
$1.284
Each (In a Pack of 10)
units
-15 V 1.5A TO-220FP Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 298-8564
Mfr. Part No.L7824CV
$0.79
Each
units
24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 751-5186
Mfr. Part No.ZLDO1117G50TA
$0.702
Each (In a Pack of 25)
units
5 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 686-9022
Mfr. Part No.L78S18CV
$1.295
Each (In a Pack of 10)
units
18 V 2A TO-220 Fixed Through Hole 21 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 655-638
Mfr. Part No.CSR2-10E
$82.44
Each
units
230 V 10A - Adjustable Panel Mount - 230 V 3 - 0 °C +75 °C - - -
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