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. 144-7801
Mfr. Part No.173010342
$17.67
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3.3 V 1A SIP Fixed Through Hole 7 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS Stock No. 516-5607
Mfr. Part No.LM337BD2TG
$2.06
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-37 → -1.2 V 1.5A D2PAK Adjustable Surface Mount - -40 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 168-6562
Mfr. Part No.LD1086D2T18TR
$0.709
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1.8 V 1.5A D2PAK Fixed Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 460-752
Mfr. Part No.LM341T-5.0/NOPB
$2.42
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5 V 500mA TO-220 Fixed Through Hole 7.2 V 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 163-2660
Mfr. Part No.NCV4949APDR2G
$1.65
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5 V 100mA SOIC Fixed Surface Mount 5 V 28 V 8 - -40 °C +150 °C 1 Positive ±1%
RS Stock No. 145-1206
Mfr. Part No.MC79L12ACLP
$0.267
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-12 V 100mA TO-92 Fixed Through Hole -14.5 V -27 V 3 - 0 °C +125 °C 1 Negative ±5%
RS Stock No. 367-520
Mfr. Part No.NJM78M05FA
$0.818
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- - - - - - - - - - - - - -
RS Stock No. 163-2594
Mfr. Part No.NCP4625HSN30T1G
$0.747
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3 V 330mA SOT-23 Adjustable Surface Mount 2.6 V 10 V 5 - -40 °C +150 °C 1 Positive -
RS Stock No. 714-0782
Mfr. Part No.LM317D2T-TR
$1.53
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1.2 → 37 V 1.5A D2PAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 748-4922
Mfr. Part No.NCP4671DSN10T1G
$1.77
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1 V 400mA SOT-23 Fixed Surface Mount 2.6 V 5.25 V 5 - - +150 °C 1 Positive ±15mV
RS Stock No. 145-3090
Mfr. Part No.MC7808ABD2TG
$1.199
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8 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 751-2894
Mfr. Part No.AP1117E50G-13
$0.439
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5 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 168-5871
Mfr. Part No.L7815ABV-DG
$0.883
Each (In a Tube of 50)
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15 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 922-8317
Mfr. Part No.AP7333-33SAG-7
$0.188
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3.3 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 714-7787
Mfr. Part No.L78S24CV
$1.206
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24 V 2A TO-220 Fixed Through Hole 27 V 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 751-3102
Mfr. Part No.AP7333-33SAG-7
$0.563
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3.3 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 688-9269
Mfr. Part No.MC78L05ABDR2G
$0.76
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 168-6604
Mfr. Part No.L7912ACV
$0.804
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-12 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±2%
RS Stock No. 102-3488
Mfr. Part No.MC7805CTG
$0.90
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 122-3376
Mfr. Part No.AS78L15RTR-G1
$0.165
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15 V 100mA SOT-89 Fixed Surface Mount - 36 V 3 750mW -40 °C +125 °C 1 Positive ±5%
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