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. 464-104
Mfr. Part No.LM337TG
HK$5.405
Each (In a Pack of 10)
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-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 103-2162
Mfr. Part No.MC7805ABD2TG
HK$5.065
Each (In a Tube of 50)
units
5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 163-2415
Mfr. Part No.LM337TG
HK$3.174
Each (In a Tube of 50)
units
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 516-5988
Mfr. Part No.MC7805ABD2TG
HK$6.634
Each (In a Pack of 5)
units
5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 178-4820
Mfr. Part No.MC79L12ACDG
HK$1.913
Each (In a Tube of 98)
units
-12 V 100mA SOIC Fixed Surface Mount - -35 V 8 - 0 °C +125 °C 1 Negative -
RS Stock No. 516-5843
Mfr. Part No.MC7815BTG
HK$4.644
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. 145-2789
Mfr. Part No.MC7815BTG
HK$3.126
Each (In a Tube of 50)
units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 688-9317
Mfr. Part No.MC79L12ACDG
HK$6.24
Each (In a Pack of 2)
units
-12 V 100mA SOIC Fixed Surface Mount - -35 V 8 - 0 °C +125 °C 1 Negative -
RS Stock No. 688-9250
Mfr. Part No.MC7812CDTRKG
HK$7.625
Each (In a Pack of 2)
units
12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 178-4730
Mfr. Part No.MC78M12CTG
HK$3.872
Each (In a Tube of 50)
units
12 V 700mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 464-108
Mfr. Part No.LM317MDTG
HK$4.51
Each (In a Pack of 10)
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1.2 → 37 V 250mA DPAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 516-4890
Mfr. Part No.MC78M12CTG
HK$12.48
Each
units
12 V 700mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 163-2480
Mfr. Part No.MC7812CDTRKG
HK$1.853
Each (On a Reel of 2500)
units
12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 102-2271
Mfr. Part No.LM317MDTG
HK$3.347
Each (In a Tube of 75)
units
1.2 → 37 V 250mA DPAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 516-5900
Mfr. Part No.MC79M12BDTG
HK$3.94
Each (In a Pack of 5)
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-12 V 500mA DPAK Fixed Surface Mount - -35 V 3 - -40 °C +125 °C 1 Negative ±4%
RS Stock No. 178-4745
Mfr. Part No.MC7812ABD2TG
HK$6.839
Each (In a Tube of 50)
units
12 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 516-4783
Mfr. Part No.LM317LZG
HK$12.17
Each
units
1.2 → 37 V 20mA TO-92 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 100-8058
Mfr. Part No.MC78L05ABDG
HK$2.056
Each (In a Tube of 98)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 101-8271
Mfr. Part No.MC7812BTG
HK$3.308
Each (In a Tube of 50)
units
12 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 178-4805
Mfr. Part No.MC78M09CDTG
HK$2.72
Each (In a Tube of 75)
units
9 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -