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. 263-9751
Mfr. Part No.BA78M10FP-E2
BrandROHM
$1.31
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10 V 500mA TO-252 Fixed Surface Mount 12.5 V 25 V 3 - -40 °C +85 °C 1 - ±4%
RS Stock No. 239-3001
Mfr. Part No.BA17815T
BrandROHM
$2.06
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15 V 1A TO-220FP Fixed Through Hole 17.5 V 30 V 3 2W -40 °C +85 °C 1 Positive -
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
$1.078
Each (In a Pack of 10)
units
5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 124-6453
Mfr. Part No.BA178M05FP-E2
BrandROHM
$0.751
Each (In a Pack of 10)
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5 V 500mA TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 167-7413
Mfr. Part No.BA178M24FP-E2
BrandROHM
$0.874
Each (In a Pack of 10)
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24 V 500mA TO-252 Fixed Surface Mount 27 V 33 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 239-2963
Mfr. Part No.BA17805T
BrandROHM
$2.37
Each
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5 V 1A TO-220FP Fixed Through Hole 7.5 V 25 V 3 2W -40 °C +85 °C 1 Positive -
RS Stock No. 171-6868
Mfr. Part No.BA7809CP-E2
BrandROHM
$0.739
Each (On a Reel of 500)
units
- - - - - - - - - - - - - -
RS Stock No. 171-6869
Mfr. Part No.BA7810CP-E2
BrandROHM
$0.698
Each (On a Reel of 500)
units
- - - - - - - - - - - - - -
RS Stock No. 128-8857
Mfr. Part No.BA7820FP-E2
BrandROHM
$1.217
Each (In a Pack of 10)
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20 V 1A TO-252 Fixed Surface Mount 23 V 33 V 3+Tab - -40 °C +85 °C 1 Positive -
RS Stock No. 171-7002
Mfr. Part No.BA78M18FP-E2
BrandROHM
$0.903
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 171-6877
Mfr. Part No.BA78M18FP-E2
BrandROHM
$0.597
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 731-3508
Mfr. Part No.BA17809FP-E2
BrandROHM
$1.072
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9 V 1A TO-252 Fixed Surface Mount 11.5 V 26 V 3 10W -40 °C +85 °C 1 Positive -
RS Stock No. 171-7004
Mfr. Part No.BD3539FVM-TR
BrandROHM
$1.676
Each (In a Pack of 5)
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- - - - - - - - - - - - - -
RS Stock No. 128-8855
Mfr. Part No.BA7809FP-E2
BrandROHM
$1.217
Each (In a Pack of 10)
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9 V 1A TO-252 Fixed Surface Mount 11.5 V 26 V 3+Tab - -40 °C +85 °C 1 Positive -
RS Stock No. 171-6874
Mfr. Part No.BA78M08FP-E2
BrandROHM
$0.597
Each (On a Reel of 2000)
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- - - - - - - - - - - - - -
RS Stock No. 167-7411
Mfr. Part No.BA178M06FP-E2
BrandROHM
$1.265
Each (In a Pack of 10)
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6 V 500mA TO-252 Fixed Surface Mount 8.5 V 21 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 171-6867
Mfr. Part No.BA7808FP-E2
BrandROHM
$0.803
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 392-1281
Mfr. Part No.BP5039A
BrandROHM
$8.32
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24 V 200mA SIP Fixed Through Hole - 113 → 170 V 6 - -20 °C +80 °C - - -
RS Stock No. 185-0938
Mfr. Part No.BD42530EFJ-CE2
BrandROHM
$1.342
Each (In a Pack of 10)
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- 250mA HTSOP - Surface Mount 5.6 V 42 V 8 - -40 °C +150 °C 1 - ±10mV
RS Stock No. 731-3555
Mfr. Part No.BA178M24FP-E2
BrandROHM
$0.96
Each (In a Pack of 5)
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24 V 500mA TO-252 Fixed Surface Mount 27 V 33 V 3 10W -40 °C +85 °C 1 Positive -