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. 398-742
Mfr. Part No.TS7824CZ COG
MYR1.618
Each (In a Pack of 50)
units
24 V 1A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-552
Mfr. Part No.TS78L05CT A3G
MYR0.416
Each (In a Pack of 50)
units
5 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 169-8944
Mfr. Part No.TS78L05CT A3G
MYR0.345
Each (On a Tape of 2000)
units
5 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-736
Mfr. Part No.TS7812CZ COG
MYR1.631
Each (In a Pack of 50)
units
12 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 169-8946
Mfr. Part No.TS78L12CS RLG
MYR0.611
Each (On a Reel of 2500)
units
12 V 150mA SOP Fixed Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-562
Mfr. Part No.TS78L12CT A3G
MYR1.00
Each (In a Pack of 50)
units
12 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 146-2238
Mfr. Part No.TS78L09CT A3G
MYR0.345
Each (On a Tape of 2000)
units
9 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-697
Mfr. Part No.TS7805CZ COG
MYR1.093
Each (In a Pack of 50)
units
5 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-657
Mfr. Part No.TS78L05CS RLG
MYR0.801
Each (In a Pack of 50)
units
5 V 150mA SOP Fixed Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 146-2240
Mfr. Part No.TS78M12CP ROG
MYR0.725
Each (On a Reel of 2500)
units
12 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-641
Mfr. Part No.TS78M12CP ROG
MYR1.171
Each (In a Pack of 50)
units
12 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-647
Mfr. Part No.TS78M05CP ROG
MYR1.662
Each (In a Pack of 50)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-524
Mfr. Part No.TS78L05ACY RMG
MYR0.969
Each (In a Pack of 50)
units
5 V 150mA SOT-89 Fixed Surface Mount - 35 V 4 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 169-8951
Mfr. Part No.TS78M05CP ROG
MYR1.118
Each (On a Reel of 2500)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 169-8945
Mfr. Part No.TS78L12CT A3G
MYR0.442
Each (On a Tape of 2000)
units
12 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-578
Mfr. Part No.TS78L09CT A3G
MYR0.867
Each (In a Pack of 50)
units
9 V 150mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 146-2236
Mfr. Part No.TS78L05ACY RMG
MYR0.507
Each (On a Reel of 1000)
units
5 V 150mA SOT-89 Fixed Surface Mount - 35 V 4 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 398-568
Mfr. Part No.TS78L12CS RLG
MYR1.128
Each (In a Pack of 50)
units
12 V 150mA SOP Fixed Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 169-8952
Mfr. Part No.TS78L05CS RLG
MYR0.611
Each (On a Reel of 2500)
units
5 V 150mA SOP Fixed Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive ±4%