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. 102-3530
Mfr. Part No.L78S05CV
£0.441
Each (In a Tube of 50)
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5 V 2A Fixed TO-220 Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 714-7780
Mfr. Part No.L78S05CV
£0.485
Each (In a Pack of 10)
Units
5 V 2A Fixed TO-220 Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 655-644
Mfr. Part No.CSR2-15E
£34.85
Each
Units
230 V 15A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 102-5717
Mfr. Part No.LM78L05ACZ/NOPB
£0.216
Each (On a Reel of 1800)
Units
5 V 100mA Fixed TO-92 Through Hole 6.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 535-9975
Mfr. Part No.LM78L05ACZ/NOPB
£0.536
Each (In a Pack of 5)
Units
5 V 100mA Fixed TO-92 Through Hole 6.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 918-1975
Mfr. Part No.L7812CV
£0.293
Each (In a Tube of 50)
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12 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6595
Mfr. Part No.L78S10CV
£0.505
Each (In a Tube of 50)
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10 V 2A Fixed TO-220 Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9757
Mfr. Part No.L78S10CV
£0.508
Each (In a Pack of 10)
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10 V 2A Fixed TO-220 Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 298-8520
Mfr. Part No.L7808CV
£2.02
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8 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6060
Mfr. Part No.L7808CV
£0.29
Each (In a Tube of 50)
Units
8 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 535-9054
Mfr. Part No.LM317HVT/NOPB
£1.922
Each (In a Pack of 5)
Units
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 102-5703
Mfr. Part No.LM317HVT/NOPB
£1.584
Each (In a Tube of 45)
Units
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 882-9770
Mfr. Part No.NCP785AH120T1G
£0.504
Each (In a Pack of 20)
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12 V 10.5 (Min)mA Fixed SOT-89 Surface Mount 85 V ac 260 V ac, 450 V dc 3 - - +150 °C 1 Positive ±5%
RS Stock No. 163-0168
Mfr. Part No.NCP785AH120T1G
£0.257
Each (On a Reel of 2500)
Units
12 V 10.5 (Min)mA Fixed SOT-89 Surface Mount 85 V ac 260 V ac, 450 V dc 3 - - +150 °C 1 Positive ±5%
RS Stock No. 655-638
Mfr. Part No.CSR2-10E
£32.84
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230 V 10A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 102-3488
Mfr. Part No.MC7805CTG
£0.383
Each (In a Tube of 50)
Units
5 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 516-4878
Mfr. Part No.MC78M05CTG
£2.00
Each
Units
5 V 700mA Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 178-4729
Mfr. Part No.MC78M05CTG
£0.361
Each (In a Tube of 50)
Units
5 V 700mA Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-3967
Mfr. Part No.LM317LZ/NOPB
£0.225
Each (On a Reel of 1800)
Units
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. 125-0056
Mfr. Part No.MC78M05CDTG
£0.279
Each (In a Tube of 75)
Units
5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
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