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. 918-1971
Mfr. Part No.L7805CV
HK$3.207
Each (In a Tube of 50)
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5 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 464-104
Mfr. Part No.LM337TG
HK$5.31
Each (In a Pack of 10)
units
-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$4.845
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$7.18
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. 516-5843
Mfr. Part No.MC7815BTG
HK$4.636
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$2.08
Each (In a Pack of 25)
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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. 121-9159
Mfr. Part No.LM317DCY
HK$5.015
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. 793-1346
Mfr. Part No.L7805CV-DG
HK$3.563
Each (In a Pack of 10)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 661-6128
Mfr. Part No.LM317DCY
HK$5.938
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. 464-108
Mfr. Part No.LM317MDTG
HK$4.37
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. 688-9250
Mfr. Part No.MC7812CDTRKG
HK$4.80
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. 178-5183
Mfr. Part No.L78L15ACZ
HK$0.792
Each (On a Reel of 2500)
units
- - - - - - - - - - - - - -
RS Stock No. 178-4820
Mfr. Part No.MC79L12ACDG
HK$1.913
Each (In a Tube of 98)
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-12 V 100mA SOIC Fixed Surface Mount - -35 V 8 - 0 °C +125 °C 1 Negative -
RS Stock No. 661-6709
Mfr. Part No.UA78L05ACD
HK$2.521
Each (In a Pack of 10)
units
5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
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. 661-3627
Mfr. Part No.LM317DCYR
HK$6.336
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. 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. 168-6047
Mfr. Part No.LM217T
HK$4.10
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS Stock No. 145-2789
Mfr. Part No.MC7815BTG
HK$3.839
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%
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