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. 145-4096
Mfr. Part No.MC78L15ACPRAG
$0.195
Each (On a Reel of 2000)
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15 V 100mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 661-6730
Mfr. Part No.UA78M05IDCY
$1.042
Each (In a Pack of 5)
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5 V 500mA SOT-223 Fixed Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 145-0649
Mfr. Part No.UA7905CKCS
$0.594
Each (In a Tube of 50)
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-5 V 1.5A TO-220 Fixed Through Hole -7 V -25 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 169-8719
Mfr. Part No.LM78L05ACZXA
$0.16
Each (On a Tape of 2000)
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 793-1346
Mfr. Part No.L7805CV-DG
$0.792
Each (In a Pack of 10)
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5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 714-0657
Mfr. Part No.L7805CD2T-TR
$1.155
Each (In a Pack of 10)
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5 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 655-644
Mfr. Part No.CSR2-15E
$146.51
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230 V 15A - Adjustable Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 661-6746
Mfr. Part No.UA7905CKCS
$0.946
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-5 V 1.5A TO-220 Fixed Through Hole -7 V -25 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 168-6595
Mfr. Part No.L78S10CV
$0.801
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10 V 2A TO-220 Fixed Through Hole 13 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 102-5703
Mfr. Part No.LM317HVT/NOPB
$3.52
Each (In a Tube of 45)
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1.2 57 V 1.5A TO-220 Adjustable Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 535-9054
Mfr. Part No.LM317HVT/NOPB
$4.33
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1.2 57 V 1.5A TO-220 Adjustable Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 102-3490
Mfr. Part No.MC7809CTG
$0.865
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9 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 806-4068
Mfr. Part No.LM78L05ACZXA
$0.625
Each (In a Pack of 50)
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 165-7697
Mfr. Part No.L79L12ACZ-TR
$0.123
Each (On a Reel of 2000)
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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. 882-9770
Mfr. Part No.NCP785AH120T1G
$1.133
Each (In a Pack of 20)
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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%
RS Stock No. 367-536
Mfr. Part No.NJM78M12FA
$3.644
Each (In a Pack of 5)
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- - - - - - - - - - - - - -
RS Stock No. 178-2328
Mfr. Part No.NJM78M12FA
$0.885
Each (In a Bag of 100)
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- - - - - - - - - - - - - -
RS Stock No. 163-2617
Mfr. Part No.NCP4683DSQ33T1G
$0.686
Each (On a Reel of 3000)
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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. 686-9717
Mfr. Part No.LM317P
$1.364
Each (In a Pack of 10)
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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. 785-6986
Mfr. Part No.MC7824ACTG
$0.789
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24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
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