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. 169-8181
Mfr. Part No.NJM7810DL1A-TE1
HK$6.056
Each (On a Reel of 3000)
units
10 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive 4%
RS Stock No. 713-9486
Mfr. Part No.NJM7810DL1A-TE1
HK$9.81
Each (In a Pack of 5)
units
10 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive 4%
RS Stock No. 657-1003
Mfr. Part No.NJM7805FA
HK$5.338
Each (In a Pack of 5)
units
5 V 1.5A TO-220F Fixed Through Hole - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 178-2332
Mfr. Part No.NJM79M09FA
HK$4.558
Each (In a Bag of 100)
units
-9 V 500mA TO-220F Fixed Through Hole - -35 V 3 7.5W -40 °C +85 °C 1 Negative -
RS Stock No. 178-2336
Mfr. Part No.NJM7918FA
HK$4.558
Each (In a Bag of 100)
units
-18 V 1.5A TO-220F Fixed Through Hole - -40 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 178-2339
Mfr. Part No.NJM79M12FA
HK$4.558
Each (In a Bag of 100)
units
-12 V 500mA TO-220F Fixed Through Hole - -35 V 3 7.5W -40 °C +85 °C 1 Negative -
RS Stock No. 178-2333
Mfr. Part No.NJM7820FA
HK$4.558
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 178-2337
Mfr. Part No.NJM7912FA
HK$4.558
Each (In a Bag of 100)
units
-12 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 178-2345
Mfr. Part No.NJM7908FA
HK$4.558
Each (In a Tube of 100)
units
-8 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 713-9477
Mfr. Part No.NJM7809DL1A-TE1
HK$9.81
Each (In a Pack of 5)
units
9 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 169-8146
Mfr. Part No.NJM7909FA
HK$4.389
Each (In a Tube of 100)
units
-9 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 178-2334
Mfr. Part No.NJM7824FA
HK$4.558
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 713-9473
Mfr. Part No.NJM7808DL1A-TE1
HK$4.326
Each (In a Pack of 5)
units
8 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 713-9470
Mfr. Part No.NJM7806DL1A-TE1
HK$5.132
Each (In a Pack of 5)
units
6 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 178-2344
Mfr. Part No.NJM7805FA
HK$4.558
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 713-9540
Mfr. Part No.NJM78M08DL1A-TE1
HK$4.808
Each (In a Pack of 5)
units
8 V 500mA TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 697-4370
Mfr. Part No.NJM7909FA
HK$7.70
Each (In a Pack of 4)
units
-9 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 713-9509
Mfr. Part No.NJM78L03UA-TE1
HK$7.758
Each (In a Pack of 5)
units
3 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 0.3W -40 °C +85 °C 1 Positive -
RS Stock No. 713-9423
Mfr. Part No.NJM317DL1-TE1
HK$5.27
Each (In a Pack of 5)
units
1.25 → 37 V 2.2A TO-252 Adjustable Surface Mount 4.25 V 40 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 178-2340
Mfr. Part No.NJM7808FA
HK$4.558
Each (In a Bag of 100)
units
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