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. 697-4370
Mfr. Part No.NJM7909FA
MYR5.168
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. 169-8146
Mfr. Part No.NJM7909FA
MYR2.49
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. 178-2270
Mfr. Part No.NJM7909FA
MYR2.695
Each (In a Tube of 50)
units
-9 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 169-8179
Mfr. Part No.NJM7809DL1A-TE1
MYR1.826
Each (On a Reel of 3000)
units
9 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 657-0741
Mfr. Part No.NJM7915FA
MYR4.864
Each (In a Pack of 5)
units
-15 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
MYR2.286
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. 178-2342
Mfr. Part No.NJM7915FA
MYR2.45
Each (In a Bag of 100)
units
-15 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 713-9600
Mfr. Part No.NJM79M15DL1A-TE1
MYR3.802
Each (In a Pack of 5)
units
-15 V 500mA TO-252 Fixed Surface Mount - -35 V 3 7.5W -40 °C +85 °C 1 Negative -
RS Stock No. 178-2344
Mfr. Part No.NJM7805FA
MYR2.45
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 178-2338
Mfr. Part No.NJM79M15FA
MYR2.45
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 371-725
Mfr. Part No.NJM7824FA
MYR3.726
Each (In a Pack of 5)
units
24 V 1.5A TO-220F Fixed Through Hole - 40 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 713-9574
Mfr. Part No.NJM79L05UA-TE1
MYR3.042
Each (In a Pack of 5)
units
-5 V 100mA SOT-89 Fixed Surface Mount - -30 V 3 0.35W -40 °C +85 °C 1 Negative -
RS Stock No. 169-8169
Mfr. Part No.NJM317DL1-TE1
MYR2.739
Each (On a Reel of 3000)
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. 178-2265
Mfr. Part No.NJM7806FA
MYR2.695
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 169-8182
Mfr. Part No.NJM7812DL1A-TE1
MYR1.826
Each (On a Reel of 3000)
units
12 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 169-8184
Mfr. Part No.NJM78L03UA-TE1
MYR1.027
Each (On a Reel of 1000)
units
3 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 0.3W -40 °C +85 °C 1 Positive -
RS Stock No. 713-9540
Mfr. Part No.NJM78M08DL1A-TE1
MYR2.336
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. 169-8185
Mfr. Part No.NJM78L07UA-TE1
MYR1.027
Each (On a Reel of 1000)
units
7 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 0.3W -40 °C +85 °C 1 Positive -
RS Stock No. 169-8187
Mfr. Part No.NJM78M05DL1A-TE1
MYR2.853
Each (On a Reel of 3000)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 178-2261
Mfr. Part No.NJM78M08FA
MYR2.493
Each (In a Tube of 20)
units
8 V 500mA TO-220F Fixed Through Hole - 35 V 3 1W -40 °C +85 °C 1 Positive -