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. 163-2480
Mfr. Part No.MC7812CDTRKG
HK$1.83
Each (On a Reel of 2500)
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12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 536-1401
Mfr. Part No.LM78L12ACM/NOPB
HK$6.42
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12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 145-2789
Mfr. Part No.MC7815BTG
HK$3.914
Each (In a Tube of 50)
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15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 828-7555
Mfr. Part No.AS78L05MTR-G1
HK$1.257
Each (In a Pack of 50)
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 750mW -40 °C +125 °C 1 Positive ±5%
RS Stock No. 661-6709
Mfr. Part No.UA78L05ACD
HK$2.82
Each (In a Pack of 10)
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5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 189-1015
Mfr. Part No.LM217T
HK$6.79
Each
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS Stock No. 121-9159
Mfr. Part No.LM317DCY
HK$4.798
Each (In a Tube of 80)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 516-5843
Mfr. Part No.MC7815BTG
HK$4.712
Each (In a Pack of 5)
units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 527-974
Mfr. Part No.UA78L05ACDR
HK$2.242
Each (In a Pack of 25)
units
5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 464-108
Mfr. Part No.LM317MDTG
HK$4.019
Each (In a Pack of 10)
units
1.2 → 37 V 250mA DPAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 661-6128
Mfr. Part No.LM317DCY
HK$5.56
Each (In a Pack of 5)
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1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 661-3627
Mfr. Part No.LM317DCYR
HK$4.874
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 100-3967
Mfr. Part No.LM317LZ/NOPB
HK$2.185
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. 516-4907
Mfr. Part No.MC7918CTG
HK$4.23
Each
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-18 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 178-4805
Mfr. Part No.MC78M09CDTG
HK$3.07
Each (In a Tube of 75)
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9 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-3487
Mfr. Part No.LM317LZG
HK$1.045
Each (In a Bag of 2000)
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1.2 → 37 V 20mA TO-92 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
HK$4.71
Each
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
HK$4.109
Each (In a Pack of 10)
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5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 125-0056
Mfr. Part No.MC78M05CDTG
HK$3.203
Each (In a Tube of 75)
units
5 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-8058
Mfr. Part No.MC78L05ABDG
HK$1.043
Each (In a Tube of 98)
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
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