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. 102-9429
Mfr. Part No.L7805CV-DG
MYR1.921
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. 793-1346
Mfr. Part No.L7805CV-DG
MYR1.921
Each (In a Pack of 10)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 805-6474
Mfr. Part No.MC7806ACTG
MYR1.911
Each (In a Pack of 25)
units
6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 145-3439
Mfr. Part No.MC7806ACTG
MYR1.911
Each (In a Tube of 50)
units
6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6809
Mfr. Part No.LM317T
MYR2.078
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 714-0792
Mfr. Part No.LM317T
MYR2.078
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 661-6721
Mfr. Part No.UA78M05CDCY
MYR2.538
Each (In a Pack of 5)
units
5 V 500mA SOT-223 Fixed Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 885-5432
Mfr. Part No.AZ1117H-5.0TRE1
MYR1.264
Each (In a Pack of 50)
units
5 V 1A SOT-223 Fixed Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 122-3393
Mfr. Part No.AZ1117H-5.0TRE1
MYR0.376
Each (On a Reel of 4000)
units
5 V 1A SOT-223 Fixed Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 168-6536
Mfr. Part No.L78S75CV
MYR2.898
Each (In a Tube of 50)
units
7.5 V 2A TO-220 Fixed Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 885-5423
Mfr. Part No.AS78L05ZTR-E1
MYR0.389
Each (In a Pack of 100)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS Stock No. 146-0587
Mfr. Part No.AS78L05ZTR-E1
MYR0.23
Each (On a Tape of 2000)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS Stock No. 121-9161
Mfr. Part No.UA78M05CDCY
MYR2.091
Each (In a Tube of 80)
units
5 V 500mA SOT-223 Fixed Surface Mount 7 V 25 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6559
Mfr. Part No.L7805CDT-TR
MYR1.007
Each (On a Reel of 2500)
units
5 V 1.5A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9221
Mfr. Part No.L7805CDT-TR
MYR2.46
Each (In a Pack of 10)
units
5 V 1.5A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9026
Mfr. Part No.L78S75CV
MYR2.898
Each (In a Pack of 10)
units
7.5 V 2A TO-220 Fixed Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
MYR8.21
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. 918-1975
Mfr. Part No.L7812CV
MYR0.914
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. 100-5905
Mfr. Part No.LM317T/NOPB
MYR7.114
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. 918-1971
Mfr. Part No.L7805CV
MYR1.626
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
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