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
SGD0.726
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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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12 V 100mA SIP Fixed Through Hole - 113 → 195 V 10 - -25 °C +80 °C - - -
RS Stock No. 178-5857
Mfr. Part No.BD70GA3WEFJ-E2
BrandROHM
SGD0.529
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7 V 300mA HTSOP Fixed Surface Mount 4.5 V 14 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 171-6874
Mfr. Part No.BA78M08FP-E2
BrandROHM
SGD0.543
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 171-7002
Mfr. Part No.BA78M18FP-E2
BrandROHM
SGD0.816
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units
- - - - - - - - - - - - - -
RS Stock No. 167-7413
Mfr. Part No.BA178M24FP-E2
BrandROHM
SGD0.722
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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. 178-5765
Mfr. Part No.BD9V100MUF-CE2
BrandROHM
SGD4.38
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. 178-5613
Mfr. Part No.BD90640HFP-CTR
BrandROHM
SGD3.475
Each (On a Reel of 3000)
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0.8 → 36 V 4A HRP Adjustable Surface Mount 3.5 V 36 V 7+Tab - -40 °C +125 °C 1 - ±2%
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%
RS Stock No. 167-7574
Mfr. Part No.BA17809FP-E2
BrandROHM
SGD1.221
Each (In a Pack of 10)
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9 V 1A TO-252 Fixed Surface Mount 11.5 V 26 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-0662
Mfr. Part No.BA00BC0WT
BrandROHM
SGD1.866
Each (In a Pack of 5)
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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. 128-8854
Mfr. Part No.BA7807FP-E2
BrandROHM
SGD1.059
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7 V 1A TO-252 Fixed Surface Mount 9.5 V 22 V 3+Tab - -40 °C +85 °C 1 Positive -
RS Stock No. 171-6877
Mfr. Part No.BA78M18FP-E2
BrandROHM
SGD0.543
Each (On a Reel of 2000)
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- - - - - - - - - - - - - -
RS Stock No. 731-3536
Mfr. Part No.BA178M10FP-E2
BrandROHM
SGD0.856
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10 V 500mA TO-252 Fixed Surface Mount 12.5 V 25 V 3 - -40 °C +85 °C 1 Positive -
RS Stock No. 178-5819
Mfr. Part No.BD33IA5WEFJ-E2
BrandROHM
SGD0.436
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3.3 V 500mA HTSOP Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 171-6875
Mfr. Part No.BA78M09FP-E2
BrandROHM
SGD0.543
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- - - - - - - - - - - - - -
RS Stock No. 731-3533
Mfr. Part No.BA178M09FP-E2
BrandROHM
SGD0.728
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9 V 500mA TO-252 Fixed Surface Mount 11.5 V 24 V 3 10W -40 °C +85 °C 1 Positive -
RS Stock No. 178-5605
Mfr. Part No.BD60HC5WEFJ-E2
BrandROHM
SGD0.47
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6 V 1.5A HTSOP Fixed Surface Mount 4.5 V 8 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-5574
Mfr. Part No.BD450M2FP3-CE2
BrandROHM
SGD0.928
Each (On a Reel of 2000)
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5 V 200mA SOT-223 Fixed Surface Mount 5.8 V 42 V 3+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 178-5942
Mfr. Part No.BD3575YFP-ME2
BrandROHM
SGD2.138
Each (In a Pack of 5)
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2.8 → 12 V 500mA TO-252 Adjustable Surface Mount 4.5 V 36 V 5+Tab - -40 °C +125 °C 1 - ±2 (Precision)%