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. 533-5711
Mfr. Part No.LM317LZ/NOPB
£2.01
Each
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1.2 → 37 V 100mA Adjustable TO-92 Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 307-957
Mfr. Part No.CSR1004A
£20.24
Each
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230 V 10A Adjustable - Through Hole - 230 V 3 - 0 °C +70 °C - - -
RS Stock No. 533-5705
Mfr. Part No.LM317EMP/NOPB
£2.01
Each
Units
1.2 → 37 V 1A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 100-3966
Mfr. Part No.LM317EMP/NOPB
£0.441
Each (On a Reel of 1000)
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1.2 → 37 V 1A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 298-8621
Mfr. Part No.L7915CV
£2.02
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-15 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 168-6067
Mfr. Part No.L7915CV
£0.381
Each (In a Tube of 50)
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-15 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 113-8596
Mfr. Part No.LM317TG
£0.466
Each (In a Tube of 50)
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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. 168-6578
Mfr. Part No.L78L33ABZ-AP
£0.069
Each (On a Tape of 2000)
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3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 686-9552
Mfr. Part No.L78L33ABZ-AP
£0.246
Each (In a Pack of 25)
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3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 661-6692
Mfr. Part No.UA7805CKCS
£0.654
Each (In a Pack of 5)
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5 V 1.5A Fixed TO-220 Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6062
Mfr. Part No.L7824CV
£0.296
Each (In a Tube of 50)
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24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 125-0050
Mfr. Part No.MC7806CTG
£0.468
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6 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 370-9637
Mfr. Part No.L200CV
£2.323
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2.85 → 36 V 2A Adjustable PENTAWATT Through Hole 8 V 18 V 5 - -25 °C +150 °C 1 Positive -
RS Stock No. 516-6177
Mfr. Part No.MC7806CTG
£2.00
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6 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 239-2963
Mfr. Part No.BA17805T
BrandROHM
£1.18
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5 V 1A Fixed TO-220FP Through Hole 7.5 V 25 V 3 2W -40 °C +85 °C 1 Positive -
RS Stock No. 298-8564
Mfr. Part No.L7824CV
£2.02
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24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 102-3528
Mfr. Part No.L78S12CV
£0.481
Each (In a Tube of 50)
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12 V 2A Fixed TO-220 Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 655-622
Mfr. Part No.CSR2-6E
£27.76
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230 V 6A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 714-7783
Mfr. Part No.L78S12CV
£0.511
Each (In a Pack of 10)
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12 V 2A Fixed TO-220 Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 100-0704
Mfr. Part No.LM340T-5.0/NOPB
£0.99
Each (In a Tube of 45)
Units
5 V 1A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
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