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. 168-6572
Mfr. Part No.L7815CD2T-TR
TWD10.00
Each (On a Reel of 1000)
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15 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 516-5758
Mfr. Part No.MC78L05ACPG
TWD16.00
Each (In a Pack of 5)
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 145-1043
Mfr. Part No.UA7815CKCS
TWD23.40
Each (In a Tube of 50)
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15 V 1.5A TO-220 Fixed Through Hole 17.5 V 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 464-104
Mfr. Part No.LM337TG
TWD21.70
Each (In a Pack of 10)
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-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 102-3501
Mfr. Part No.MC78L05ACPG
TWD5.00
Each (In a Bag of 2000)
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6059
Mfr. Part No.L7805ACV
TWD16.70
Each (In a Tube of 50)
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 660-8013
Mfr. Part No.UA7815CKCS
TWD28.20
Each (In a Pack of 5)
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15 V 1.5A TO-220 Fixed Through Hole 17.5 V 30 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
TWD20.00
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
TWD16.80
Each (In a Pack of 10)
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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. 686-9397
Mfr. Part No.L7815CD2T-TR
TWD22.80
Each (In a Pack of 10)
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15 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 100-0704
Mfr. Part No.LM340T-5.0/NOPB
TWD48.00
Each (In a Tube of 45)
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5 V 1A TO-220 Fixed Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 922-8474
Mfr. Part No.ZLDO1117G33TA
TWD6.60
Each (On a Reel of 1000)
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3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 163-2415
Mfr. Part No.LM337TG
TWD21.70
Each (In a Tube of 50)
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-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 686-9820
Mfr. Part No.L7805ABV
TWD14.30
Each (In a Pack of 25)
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5 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 756-3918
Mfr. Part No.TA7805F(TE16L1,NQ)
BrandToshiba
TWD21.40
Each (In a Pack of 5)
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5.25 V 1A HSOP Fixed Surface Mount 10 V 33 V 3 - -30 °C +150 °C 1 Positive ±4%
RS Stock No. 168-6594
Mfr. Part No.L7912CP
TWD25.50
Each (In a Tube of 50)
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-12 V 1.5A TO-220FP Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 460-768
Mfr. Part No.LM340T-5.0/NOPB
TWD56.60
Each (In a Pack of 5)
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5 V 1A TO-220 Fixed Through Hole 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 125-0050
Mfr. Part No.MC7806CTG
TWD17.80
Each (In a Tube of 50)
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6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 751-5183
Mfr. Part No.ZLDO1117G33TA
TWD13.90
Each (In a Pack of 25)
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3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 518-8385
Mfr. Part No.MC79L15ACPRAG
TWD15.40
Each (In a Pack of 5)
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-15 V 100mA TO-92 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative -