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. 102-2270
Mfr. Part No.LM317D2TG
HK$4.685
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A D2PAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
HK$17.57
Each
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
HK$10.616
Each (In a Tube of 45)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 516-5809
Mfr. Part No.MC78M09CDTG
HK$3.348
Each (In a Pack of 5)
units
9 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 463-454
Mfr. Part No.MC7812BTG
HK$4.21
Each (In a Pack of 20)
units
12 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 463-290
Mfr. Part No.MC78L05ABDG
HK$2.356
Each (In a Pack of 25)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 918-1975
Mfr. Part No.L7812CV
HK$3.00
Each (In a Tube of 50)
units
12 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 625-6316
Mfr. Part No.MC7812ABD2TG
HK$7.014
Each (In a Pack of 5)
units
12 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 759-1809
Mfr. Part No.ADP2108AUJZ-3.3-R7
HK$13.50
Each (In a Pack of 5)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 168-6572
Mfr. Part No.L7815CD2T-TR
HK$2.65
Each (On a Reel of 1000)
units
15 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 536-1322
Mfr. Part No.LM337LM/NOPB
HK$7.32
Each
units
-37 → -1.2 V 100mA SOIC Adjustable Surface Mount -40 V -4.2 V 8 0.625W -25 °C +125 °C 1 Negative -
RS Stock No. 516-5900
Mfr. Part No.MC79M12BDTG
HK$3.94
Each (In a Pack of 5)
units
-12 V 500mA DPAK Fixed Surface Mount - -35 V 3 - -40 °C +125 °C 1 Negative ±4%
RS Stock No. 102-3487
Mfr. Part No.LM317LZG
HK$1.369
Each (In a Bag of 2000)
units
1.2 → 37 V 20mA TO-92 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 178-4731
Mfr. Part No.MC7918CTG
HK$3.22
Each (In a Tube of 50)
units
-18 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 102-5750
Mfr. Part No.LM337LM/NOPB
HK$5.275
Each (In a Tube of 95)
units
-37 → -1.2 V 100mA SOIC Adjustable Surface Mount -40 V -4.2 V 8 0.625W -25 °C +125 °C 1 Negative -
RS Stock No. 464-097
Mfr. Part No.LM317D2TG
HK$5.74
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A D2PAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 516-4907
Mfr. Part No.MC7918CTG
HK$4.16
Each
units
-18 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 719-2768
Mfr. Part No.NCP7805TG
HK$3.781
Each (In a Pack of 10)
units
5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 103-5083
Mfr. Part No.NCP7805TG
HK$3.013
Each (In a Tube of 50)
units
5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 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 -
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