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. 714-0672
Mfr. Part No.L78L05ABD13TR
$0.471
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 100-5948
Mfr. Part No.LM7905CT/NOPB
$1.141
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-5 V 1.5A TO-220 Fixed Through Hole - -10 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 367-536
Mfr. Part No.NJM78M12FA
$0.94
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RS Stock No. 168-6064
Mfr. Part No.L78M05CV
$0.413
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5 V 500mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 178-2328
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$0.885
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Mfr. Part No.LM350K STEEL/NOPB
$56.07
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1.2 → 33 V 3A TO-3 Adjustable Through Hole 4.2 V 35 V 3 30W 0 °C +125 °C 1 Positive -
RS Stock No. 534-3885
Mfr. Part No.LM7905CT/NOPB
$2.55
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-5 V 1.5A TO-220 Fixed Through Hole - -10 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 714-7796
Mfr. Part No.L79L12ACZ-TR
$0.49
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-12 V 100mA TO-92 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±5%
RS Stock No. 785-6986
Mfr. Part No.MC7824ACTG
$0.653
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24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 125-0053
Mfr. Part No.MC7824ACTG
$0.642
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24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 163-2617
Mfr. Part No.NCP4683DSQ33T1G
$0.686
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3.3 V 400mA SC-70 Fixed Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS Stock No. 168-6797
Mfr. Part No.L7809CV
$0.353
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9 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 732-1206
Mfr. Part No.UA78L08ACLPRE3
$0.326
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8 V 100mA TO-92 Fixed Through Hole 10.5 V 23 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 463-650
Mfr. Part No.MC7805CDTG
$0.838
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5 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 756-3930
Mfr. Part No.TA78M05F(TE16L1,NQ
BrandToshiba
$0.794
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5.25 V 500mA HSOP Fixed Surface Mount 10 V 35 V 3 - -30 °C +150 °C 1 Positive ±4%
RS Stock No. 145-5671
Mfr. Part No.KA78L18AZTA
$0.125
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18 V 100mA TO-92 Fixed Through Hole - 35 V 3 0.75W 0 °C +125 °C 1 - -
RS Stock No. 121-9336
Mfr. Part No.LM317KCT
$0.648
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37 V 1.5A TO-220 Adjustable Through Hole - - 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6586
Mfr. Part No.LM317P
$0.897
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1.2 → 37 V 1.5A TO-220FP Adjustable Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-5784
Mfr. Part No.L7812CP
$0.733
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12 V 1.5A TO-220FP Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 882-9770
Mfr. Part No.NCP785AH120T1G
$1.133
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12 V 10.5 (Min)mA SOT-89 Fixed Surface Mount 85 V ac 260 V ac, 450 V dc 3 - - +150 °C 1 Positive ±5%
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