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. 714-0666
Mfr. Part No.L7809CV
kr 3,111
Each (In a Pack of 10)
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9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 860-7286
Mfr. Part No.LM317BT
kr 5,563
Each (In a Pack of 10)
Units
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 168-6797
Mfr. Part No.L7809CV
kr 3,105
Each (In a Tube of 50)
Units
9 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 625-6338
Mfr. Part No.MC78M05ABDTG
kr 5,504
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. 168-8786
Mfr. Part No.LM317BT
kr 3,613
Each (In a Tube of 50)
Units
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 178-5059
Mfr. Part No.L7805ACD2T-TR
kr 2,393
Each (On a Reel of 1000)
Units
- - - - - - - - - - - - - -
RS Stock No. 103-3895
Mfr. Part No.MC78M05ABDTG
kr 4,549
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. 774-3543
Mfr. Part No.MC7808BTG
kr 4,626
Each (In a Pack of 10)
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8 V 1A Fixed TO-220 Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive 4%
RS Stock No. 178-4766
Mfr. Part No.MC7808BTG
kr 3,856
Each (In a Tube of 50)
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8 V 1A Fixed TO-220 Through Hole - 40 V dc 3 - -40 °C +125 °C 1 Positive 4%
RS Stock No. 686-9530
Mfr. Part No.L7805ACD2T-TR
kr 5,117
Each (In a Pack of 25)
Units
5 V 1.5A Fixed D2PAK Surface Mount - 35 V 3 - 0 °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. 122-0379
Mfr. Part No.AP7313-33SAG-7
kr 0,83
Each (On a Reel of 3000)
Units
3.3 V 150mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 168-6062
Mfr. Part No.L7824CV
kr 3,105
Each (In a Tube of 50)
Units
24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 298-8564
Mfr. Part No.L7824CV
kr 3,89
Each
Units
24 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 661-6705
Mfr. Part No.UA7812CKCS
kr 6,38
Each (In a Pack of 5)
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12 V 1.5A Fixed TO-220 Through Hole 14.5 V 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 162-5911
Mfr. Part No.TL780-05KCS
kr 5,517
Each (In a Tube of 50)
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5 V 1.5A Fixed TO-220 Through Hole 7 V 25 V 3 - 0 °C +125 °C 1 Positive ±1%
RS Stock No. 300-344
Mfr. Part No.CSR604A
kr 264,80
Each
Units
230 V 6A Adjustable - Through Hole - 230 V 3 - 0 °C +70 °C - - -
RS Stock No. 922-3514
Mfr. Part No.UA7812CKCS
kr 5,272
Each (In a Tube of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 751-3064
Mfr. Part No.AP7313-33SAG-7
kr 2,201
Each (In a Pack of 50)
Units
3.3 V 150mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 655-644
Mfr. Part No.CSR2-15E
kr 385,84
Each
Units
230 V 15A Adjustable - Panel Mount - 230 V 3 - 0 °C +75 °C - - -
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