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 Output Type Package 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. 113-8596
Mfr. Part No.LM317TG
kr 5,274
Each (In a Tube of 50)
Units
1.2 37 V 2.2A Adjustable TO-220 Through Hole -0.3 V 40 V 3 - -55 °C +150 °C 1 - -
RS Stock No. 464-104
Mfr. Part No.LM337TG
kr 5,563
Each (In a Pack of 10)
Units
-37 -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 163-2415
Mfr. Part No.LM337TG
kr 5,051
Each (In a Tube of 50)
Units
-37 -1.2 V 1.5A Adjustable TO-220 Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 774-3543
Mfr. Part No.MC7808BTG
kr 4,616
Each (In a Pack of 10)
Units
8 V 1A Fixed TO-220 Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive 4%
RS Stock No. 103-3895
Mfr. Part No.MC78M05ABDTG
kr 4,944
Each (In a Tube of 75)
Units
5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 145-5382
Mfr. Part No.KA317TU
kr 7,98
Each (In a Tube of 50)
Units
1.2 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 625-6338
Mfr. Part No.MC78M05ABDTG
kr 5,922
Each (In a Pack of 5)
Units
5 V 700mA Fixed D-PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 681-0418
Mfr. Part No.KA317TU
kr 8,774
Each (In a Pack of 5)
Units
1.2 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 178-4766
Mfr. Part No.MC7808BTG
kr 3,868
Each (In a Tube of 50)
Units
8 V 1A Fixed TO-220 Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive 4%
RS Stock No. 102-3491
Mfr. Part No.MC7812CTG
kr 4,483
Each (In a Tube of 50)
Units
12 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 785-2375
Mfr. Part No.MC7808CDTT5G
kr 3,54
Each (On a Tape of 5)
Units
8 V 2.2A Fixed DPAK Surface Mount - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 125-0057
Mfr. Part No.MC78M12CDTG
kr 3,439
Each (In a Tube of 75)
Units
12 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 163-2615
Mfr. Part No.NCP4683DSQ18T1G
kr 2,638
Each (On a Reel of 3000)
Units
1.8 V 400mA Fixed SC-70 Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS Stock No. 785-6958
Mfr. Part No.MC7812ABTG
kr 5,194
Each (In a Pack of 10)
Units
12 V 1A Fixed TO-220 Through Hole - 40 V 3 15W -40 °C +125 °C 1 Positive -
RS Stock No. 806-2857
Mfr. Part No.LM7810CT
kr 5,374
Each (In a Tube of 50)
Units
10 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 748-8842
Mfr. Part No.NCP4683DSQ18T1G
kr 7,576
Each (In a Pack of 5)
Units
1.8 V 400mA Fixed SC-70 Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS Stock No. 163-0954
Mfr. Part No.MC7808CDTT5G
kr 3,493
Each (On a Reel of 2500)
Units
8 V 2.2A Fixed DPAK Surface Mount - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 464-114
Mfr. Part No.MC78M12CDTG
kr 3,853
Each (In a Pack of 20)
Units
12 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 121-6355
Mfr. Part No.MC7812ABTG
kr 4,73
Each (In a Tube of 50)
Units
12 V 1A Fixed TO-220 Through Hole - 40 V 3 15W -40 °C +125 °C 1 Positive -
RS Stock No. 757-7190
Mfr. Part No.NCV4274AST33T3G
kr 12,065
Each (In a Pack of 2)
Units
3.3 V 400mA Fixed SOT-223 Surface Mount 4.5 V 40 V 3+Tab - -40 °C +150 °C 1 Positive 2%