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. 124-1691
Mfr. Part No.LM350T
MYR3.359
Each (In a Tube of 50)
units
1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 460-900
Mfr. Part No.LM338T/NOPB
MYR8.218
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. 100-0719
Mfr. Part No.LM338T/NOPB
MYR6.916
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. 633-026
Mfr. Part No.L78S05CV
BrandMagnatec
MYR5.68
Each
units
5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 661-6730
Mfr. Part No.UA78M05IDCY
MYR2.048
Each (In a Pack of 5)
units
5 V 500mA SOT-223 Fixed Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 370-9637
Mfr. Part No.L200CV
MYR10.764
Each (In a Tube of 50)
units
2.85 → 36 V 2A PENTAWATT Adjustable Through Hole 8 V 18 V 5 - -25 °C +150 °C 1 Positive -
RS Stock No. 168-6066
Mfr. Part No.L7905CV
MYR1.107
Each (In a Tube of 50)
units
-5 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 533-5705
Mfr. Part No.LM317EMP/NOPB
MYR2.43
Each
units
1.2 → 37 V 1A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 681-0418
Mfr. Part No.KA317TU
MYR3.12
Each (In a Pack of 5)
units
1.2 → 37 V 2.2A TO-220 Adjustable Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6049
Mfr. Part No.L78L05ACZ
MYR0.333
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. 714-7783
Mfr. Part No.L78S12CV
MYR2.45
Each (In a Pack of 10)
units
12 V 2A TO-220 Fixed Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 102-3530
Mfr. Part No.L78S05CV
MYR1.686
Each (In a Tube of 50)
units
5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 714-7780
Mfr. Part No.L78S05CV
MYR2.41
Each (In a Pack of 10)
units
5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 157-8360
Mfr. Part No.LT1033CT#PBF
MYR19.799
Each (In a Tube of 50)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 100-3966
Mfr. Part No.LM317EMP/NOPB
MYR2.204
Each (On a Reel of 1000)
units
1.2 → 37 V 1A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 298-8615
Mfr. Part No.L7905CV
MYR2.33
Each
units
-5 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 125-0053
Mfr. Part No.MC7824ACTG
MYR1.695
Each (In a Tube of 50)
units
24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 922-8478
Mfr. Part No.ZLDO1117K33TC
MYR1.149
Each (On a Reel of 2500)
units
3.3 V 1A TO-252 Fixed Surface Mount 2.7 V 18 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 102-3529
Mfr. Part No.L78L05ACZTR
MYR0.431
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. 102-3528
Mfr. Part No.L78S12CV
MYR2.045
Each (In a Tube of 50)
units
12 V 2A TO-220 Fixed Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
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