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. 100-0719
Mfr. Part No.LM338T/NOPB
kr 15,465
Each (In a Tube of 45)
Units
1.2 → 32 V 5A Adjustable TO-220 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
kr 18,166
Each (In a Pack of 5)
Units
1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 168-5783
Mfr. Part No.L7805CP
kr 6,074
Each (In a Tube of 50)
Units
5 V 1.5A Fixed TO-220FP Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 922-3520
Mfr. Part No.UA78M33CDCY
kr 4,133
Each (In a Tube of 80)
Units
- - - - - - - - - - - - - -
RS Stock No. 661-6733
Mfr. Part No.UA78M33CDCY
kr 4,986
Each (In a Pack of 5)
Units
3.3 V 500mA Fixed SOT-223 Surface Mount 5.3 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 113-8596
Mfr. Part No.LM317TG
kr 4,739
Each (In a Tube of 50)
Units
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole -0.3 V 40 V 3 - -55 °C +150 °C 1 - -
RS Stock No. 296-756
Mfr. Part No.L7805CP
kr 7,38
Each
Units
5 V 1.5A Fixed TO-220FP Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 922-8474
Mfr. Part No.ZLDO1117G33TA
kr 1,674
Each (On a Reel of 1000)
Units
3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 751-5183
Mfr. Part No.ZLDO1117G33TA
kr 3,537
Each (In a Pack of 25)
Units
3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 661-6692
Mfr. Part No.UA7805CKCS
kr 6,80
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 -
RS Stock No. 922-3511
Mfr. Part No.UA7805CKCS
kr 5,611
Each (In a Tube of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 168-6809
Mfr. Part No.LM317T
kr 4,369
Each (In a Tube of 50)
Units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 714-0792
Mfr. Part No.LM317T
kr 4,367
Each (In a Pack of 10)
Units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 308-584
Mfr. Part No.CSR1504A
kr 206,78
Each
Units
230 V 15A Adjustable - Through Hole - 230 V 3 - 0 °C +70 °C - - -
RS Stock No. 661-6128
Mfr. Part No.LM317DCY
kr 6,222
Each (In a Pack of 5)
Units
1.25 → 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 121-9159
Mfr. Part No.LM317DCY
kr 5,305
Each (In a Tube of 80)
Units
1.25 → 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 661-3627
Mfr. Part No.LM317DCYR
kr 5,184
Each (In a Pack of 5)
Units
1.25 → 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 163-2415
Mfr. Part No.LM337TG
kr 5,026
Each (In a Tube of 50)
Units
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 464-104
Mfr. Part No.LM337TG
kr 5,032
Each (In a Pack of 10)
Units
-37 → -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 860-7286
Mfr. Part No.LM317BT
kr 5,563
Each (In a Pack of 10)
Units
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
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