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. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
SGD0.773
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5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 392-1225
Mfr. Part No.BP5034D12
BrandROHM
SGD6.79
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units
12 V 100mA SIP Fixed Through Hole - 113 → 195 V 10 - -25 °C +80 °C - - -
RS Stock No. 178-5771
Mfr. Part No.BD433M5WFP2-CZE2
BrandROHM
SGD2.26
Each (In a Pack of 5)
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3.3 V 500mA TO-263 Fixed Surface Mount 4.6 V 42 V 5+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 178-5819
Mfr. Part No.BD33IA5WEFJ-E2
BrandROHM
SGD0.722
Each (In a Pack of 20)
units
3.3 V 500mA HTSOP Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 124-6451
Mfr. Part No.BA17808FP-E2
BrandROHM
SGD1.479
Each (In a Pack of 10)
units
8 (Typ.) V 1A TO-252 Fixed Surface Mount 10.5 V 23 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 124-6449
Mfr. Part No.BA17805CP-E2
BrandROHM
SGD1.948
Each (In a Pack of 10)
units
5 V 1A TO-220 Fixed Through Hole 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-5566
Mfr. Part No.BD33IA5WEFJ-E2
BrandROHM
SGD0.322
Each (On a Reel of 2500)
units
3.3 V 500mA HTSOP Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-5761
Mfr. Part No.BD33GA3WEFJ-E2
BrandROHM
SGD0.785
Each (In a Pack of 20)
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3.3 V 300mA HTSOP Fixed Surface Mount 4.5 V 14 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 171-6871
Mfr. Part No.BA7815FP-E2
BrandROHM
SGD0.73
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 171-6928
Mfr. Part No.BA7808FP-E2
BrandROHM
SGD1.25
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- - - - - - - - - - - - - -
RS Stock No. 178-0030
Mfr. Part No.BA00BC0WT
BrandROHM
SGD2.11
Each (In a Tube of 500)
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12 V 1A TO220FP-5 Adjustable Through Hole 3 V 16 V 5 - -40 °C +105 °C 1 - ±2%
RS Stock No. 178-0649
Mfr. Part No.BD00IC0WEFJ-E2
BrandROHM
SGD0.993
Each (In a Pack of 20)
units
4.5 V 1A HTSOP-J8 Adjustable Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 124-6459
Mfr. Part No.BA78M05FP-E2
BrandROHM
SGD1.08
Each (In a Pack of 10)
units
5 V 500mA TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 731-3524
Mfr. Part No.BA178M08FP-E2
BrandROHM
SGD1.49
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units
8 V 500mA TO-252 Fixed Surface Mount 10.5 V 23 V 3 10W -40 °C +85 °C 1 Positive -
RS Stock No. 178-5917
Mfr. Part No.BD3570YFP-ME2
BrandROHM
SGD3.81
Each (In a Pack of 5)
units
3.3 V 500mA TO-252 Fixed Surface Mount 4.5 V 36 V 3+Tab - -40 °C +125 °C 1 - ±2 (Precision)%
RS Stock No. 731-3555
Mfr. Part No.BA178M24FP-E2
BrandROHM
SGD1.49
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 -
RS Stock No. 178-5601
Mfr. Part No.BD50C0AWFP-CE2
BrandROHM
SGD1.30
Each (On a Reel of 2000)
units
5 V 1A TO-252 Fixed Surface Mount 4 V 26.5 V 5+Tab - -40 °C +125 °C 1 - ±1%
RS Stock No. 178-5573
Mfr. Part No.BD433M5WFP2-CZE2
BrandROHM
SGD1.34
Each (On a Reel of 500)
units
3.3 V 500mA TO-263 Fixed Surface Mount 4.6 V 42 V 5+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 124-6457
Mfr. Part No.BA7806FP-E2
BrandROHM
SGD1.326
Each (In a Pack of 10)
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6 (Typ.) V 1A 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
SGD0.73
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -