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
SGD0.847
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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
SGD7.26
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units
12 V 100mA SIP Fixed Through Hole - 113 → 195 V 10 - -25 °C +80 °C - - -
RS Stock No. 178-5810
Mfr. Part No.BD9A600MUV-E2
BrandROHM
SGD1.361
Each (In a Pack of 10)
units
0.8 → 3.85 V 6A VQFN Adjustable Surface Mount 2.7 V 5.5 V 16 - -40 °C +85 °C 1 - -
RS Stock No. 171-6998
Mfr. Part No.BA78M09FP-E2
BrandROHM
SGD0.816
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 178-5765
Mfr. Part No.BD9V100MUF-CE2
BrandROHM
SGD6.22
Each (In a Pack of 2)
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0.8 → 5.5 V 1A VQFN Adjustable Surface Mount 16 V 60 V 24 - -40 °C +125 °C 1 - ±2%
RS Stock No. 178-0043
Mfr. Part No.BD18IA5WEFJ-E2
BrandROHM
SGD0.29
Each (On a Reel of 2500)
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18 V 500mA HTSOP-J8 Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 392-1247
Mfr. Part No.BP5034D15
BrandROHM
SGD13.58
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15 V 80mA SIP Fixed Through Hole - 113 → 195 V 10 - -20 °C +80 °C - - -
RS Stock No. 171-6871
Mfr. Part No.BA7815FP-E2
BrandROHM
SGD0.73
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 178-5617
Mfr. Part No.BD9E151NUX-TR
BrandROHM
SGD0.583
Each (On a Reel of 4000)
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1 → 19.6 V 1.2A VSON Adjustable Surface Mount 6 V 28 V 8 - -40 °C +85 °C 1 - ±1 (Precision)%
RS Stock No. 178-5576
Mfr. Part No.BD450M5WFPJ-CZE2
BrandROHM
SGD1.186
Each (On a Reel of 2000)
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5 V 500mA TO-252 Fixed Surface Mount 3 V 42 V 5+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 167-7604
Mfr. Part No.BA178M10FP-E2
BrandROHM
SGD0.73
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10 V 500mA TO-252 Fixed Surface Mount 12.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 167-7551
Mfr. Part No.BA178M09FP-E2
BrandROHM
SGD0.873
Each (In a Pack of 10)
units
9 V 500mA TO-252 Fixed Surface Mount 11.5 V 26 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 167-7411
Mfr. Part No.BA178M06FP-E2
BrandROHM
SGD1.391
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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. 124-6456
Mfr. Part No.BA7805FP-E2
BrandROHM
SGD1.059
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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. 178-5917
Mfr. Part No.BD3570YFP-ME2
BrandROHM
SGD2.138
Each (In a Pack of 5)
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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. 178-5789
Mfr. Part No.BD33HC0WEFJ-E2
BrandROHM
SGD0.646
Each (In a Pack of 20)
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3.3 V 100mA HTSOP Fixed Surface Mount 4.5 V 8 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 128-8859
Mfr. Part No.BA78M20FP-E2
BrandROHM
SGD0.777
Each (In a Pack of 10)
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20 V 500mA TO-252 Fixed Surface Mount 23 V 33 V 3+Tab - -40 °C +85 °C 1 Positive -
RS Stock No. 178-5913
Mfr. Part No.BD80GA3WEFJ-E2
BrandROHM
SGD0.529
Each (In a Pack of 20)
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8 V 300mA HTSOP Fixed Surface Mount 4.5 V 14 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 167-7505
Mfr. Part No.BA17806FP-E2
BrandROHM
SGD1.10
Each (In a Pack of 10)
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6 V 1A TO-252 Fixed Surface Mount 8.5 V 21 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 167-7292
Mfr. Part No.BA178M15FP-E2
BrandROHM
SGD0.991
Each (In a Pack of 10)
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15 V 500mA TO-252 Fixed Surface Mount 17.5 V 30 V 3 - -40 °C +85 °C 1 Positive ±4%