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. 102-3487
Mfr. Part No.LM317LZG
HK$1.133
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. 463-454
Mfr. Part No.MC7812BTG
HK$3.789
Each (In a Pack of 20)
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12 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 166-2730
Mfr. Part No.KA7815ETU
HK$5.953
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15 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 661-6812
Mfr. Part No.UA78L05ACLPR
HK$3.271
Each (In a Pack of 10)
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5 V 100mA TO-92 Fixed Through Hole 7 V 20 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 625-6316
Mfr. Part No.MC7812ABD2TG
HK$7.10
Each (In a Pack of 5)
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12 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 168-8786
Mfr. Part No.LM317BT
HK$3.698
Each (In a Tube of 50)
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1.2 → 37 V 2.2A TO-220 Adjustable Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 125-0056
Mfr. Part No.MC78M05CDTG
HK$3.203
Each (In a Tube of 75)
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5 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6572
Mfr. Part No.L7815CD2T-TR
HK$2.88
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15 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
HK$4.202
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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. 463-290
Mfr. Part No.MC78L05ABDG
HK$2.409
Each (In a Pack of 25)
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 516-5900
Mfr. Part No.MC79M12BDTG
HK$5.31
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-12 V 500mA DPAK Fixed Surface Mount - -35 V 3 - -40 °C +125 °C 1 Negative ±4%
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
HK$4.88
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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. 719-2768
Mfr. Part No.NCP7805TG
HK$3.976
Each (In a Pack of 10)
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5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS Stock No. 178-8831
Mfr. Part No.LM79L12ACM/NOPB
HK$6.168
Each (In a Tube of 95)
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-12 V 100mA SOIC Fixed Surface Mount -35 V -14.6 V 8 - 0 °C +70 °C 1 Negative -
RS Stock No. 516-4783
Mfr. Part No.LM317LZG
HK$4.58
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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. 533-5698
Mfr. Part No.LM317AT/NOPB
HK$12.28
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 178-4731
Mfr. Part No.MC7918CTG
HK$3.626
Each (In a Tube of 50)
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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. 168-4874
Mfr. Part No.UA78L05ACLP
HK$1.37
Each (In a Box of 1000)
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5 V 100mA TO-92 Fixed Through Hole 7 V 20 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 463-767
Mfr. Part No.MC7805CD2TG
HK$4.65
Each (In a Pack of 10)
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5 V 1A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 686-9824
Mfr. Part No.L7885CV
HK$3.234
Each (In a Pack of 25)
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8.5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
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