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. 145-9195
Mfr. Part No.L78S18CV
$0.544
Each (In a Tube of 50)
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18 V 2A TO-220 Fixed Through Hole 21 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9022
Mfr. Part No.L78S18CV
$1.188
Each (In a Pack of 10)
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18 V 2A TO-220 Fixed Through Hole 21 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 655-638
Mfr. Part No.CSR2-10E
$124.82
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230 V 10A - Adjustable Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 661-6232
Mfr. Part No.TL783CKCSE3
$4.074
Each (In a Pack of 5)
units
1.25 → 125 V 700mA TO-220 Adjustable Through Hole 21.5 V 150 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 125-0057
Mfr. Part No.MC78M12CDTG
$0.633
Each (In a Tube of 75)
units
12 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 918-1975
Mfr. Part No.L7812CV
$0.521
Each (In a Tube of 50)
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12 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-5783
Mfr. Part No.L7805CP
$0.777
Each (In a Tube of 50)
units
5 V 1.5A TO-220FP Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 793-1355
Mfr. Part No.L7812CV-DG
$0.788
Each (In a Pack of 10)
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12 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 168-7135
Mfr. Part No.L7812CV-DG
$0.413
Each (In a Tube of 50)
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12 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
$2.49
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. 464-114
Mfr. Part No.MC78M12CDTG
$0.62
Each (In a Pack of 20)
units
12 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
$2.105
Each (In a Tube of 45)
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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. 296-756
Mfr. Part No.L7805CP
$1.39
Each
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5 V 1.5A TO-220FP Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 518-8379
Mfr. Part No.MC78L15ACPRAG
$0.742
Each (In a Pack of 5)
units
15 V 100mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 178-7547
Mfr. Part No.LM78L05ACZX
$0.124
Each (On a Reel of 2000)
units
5 V 100mA TO-92 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±5%
RS Stock No. 102-9429
Mfr. Part No.L7805CV-DG
$0.404
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 661-6730
Mfr. Part No.UA78M05IDCY
$0.948
Each (In a Pack of 5)
units
5 V 500mA SOT-223 Fixed Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 535-9054
Mfr. Part No.LM317HVT/NOPB
$3.856
Each (In a Pack of 5)
units
1.2 → 57 V 1.5A TO-220 Adjustable Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 761-3549
Mfr. Part No.LM78L05ACZ
$0.434
Each (In a Pack of 25)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 686-9757
Mfr. Part No.L78S10CV
$0.966
Each (In a Pack of 10)
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10 V 2A TO-220 Fixed Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
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