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. 181-3744
Mfr. Part No.RAA2108702GLG#AG0
$139.35
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0.6 5 V 70A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3739
Mfr. Part No.RAA2109252GLG#AG0
$88.11
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0.6 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3675
Mfr. Part No.RTKA2108502H00000BU
$298.12
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RS Stock No. 181-3674
Mfr. Part No.RTKA2108332H00000BU
$244.45
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RS Stock No. 181-3669
Mfr. Part No.RAA2108332GLG#AG0
$62.246
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0.6 5 V 33A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3670
Mfr. Part No.RAA2109252GLG#AG0
$78.755
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0.6 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3677
Mfr. Part No.RTKA2109252H00000BU
$360.71
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- - - - - - - - - - - - - -
RS Stock No. 181-3673
Mfr. Part No.RTKA2108252H00000BU
$298.12
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RS Stock No. 772-6645
Mfr. Part No.UPC1093T-E1-AZ
$0.632
Each (On a Reel of 15)
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36 V 150mA SOT-89 Adjustable Surface Mount 2.44 V 2.55 V 3 2W -20 °C +85 °C 1 Positive ±2%
RS Stock No. 181-3735
Mfr. Part No.RAA2108252GLG#AG0
$59.70
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0.6 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3676
Mfr. Part No.RTKA2108702H00000BU
$310.04
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- - - - - - - - - - - - - -
RS Stock No. 181-3742
Mfr. Part No.RAA2108502GLG#AG0
$93.73
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0.6 5 V 50A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3668
Mfr. Part No.RAA2108252GLG#AG0
$52.594
Each (In a Tray of 36)
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0.6 5 V 25A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3672
Mfr. Part No.RAA2108702GLG#AG0
$133.254
Each (In a Tray of 20)
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0.6 5 V 70A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3737
Mfr. Part No.RAA2108332GLG#AG0
$70.64
Each
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0.6 5 V 33A HDA Fixed Surface Mount 4.5 V 14 V 41 - -40 °C +85 °C 1 - ±1.2%
RS Stock No. 181-3671
Mfr. Part No.RAA2108502GLG#AG0
$88.036
Each (In a Tray of 20)
units
0.6 5 V 50A HDA Fixed Surface Mount 4.5 V 14 V 58 - -40 °C +85 °C 1 - ±1.2%