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. 121-9336
Mfr. Part No.LM317KCT
$0.648
Each (In a Tube of 50)
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37 V 1.5A TO-220 Adjustable Through Hole - - 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6047
Mfr. Part No.LM217T
$0.771
Each (In a Tube of 50)
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1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS Stock No. 748-8854
Mfr. Part No.NCP4683DSQ33T1G
$0.64
Each (In a Pack of 5)
units
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. 168-6586
Mfr. Part No.LM317P
$0.897
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220FP Adjustable Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 805-6622
Mfr. Part No.MC7915CD2TR4G
$0.581
Each (On a Tape of 20)
units
-15 V 1A D2PAK Fixed Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 163-0168
Mfr. Part No.NCP785AH120T1G
$0.577
Each (On a Reel of 2500)
units
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. 882-9770
Mfr. Part No.NCP785AH120T1G
$1.133
Each (In a Pack of 20)
units
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. 732-1206
Mfr. Part No.UA78L08ACLPRE3
$0.326
Each (In a Pack of 5)
units
8 V 100mA TO-92 Fixed Through Hole 10.5 V 23 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 714-0666
Mfr. Part No.L7809CV
$0.603
Each (In a Pack of 10)
units
9 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 714-0675
Mfr. Part No.L78L05ABUTR
$0.576
Each (In a Pack of 10)
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5 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 686-9717
Mfr. Part No.LM317P
$1.309
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A TO-220FP Adjustable Through Hole 3 V - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 296-778
Mfr. Part No.L7812CP
$0.88
Each
units
12 V 1.5A TO-220FP Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 663-3246
Mfr. Part No.LM350K STEEL/NOPB
$55.00
Each
units
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. 162-6476
Mfr. Part No.UA78L08ACLPRE3
$0.221
Each (On a Reel of 2000)
units
8 V 100mA TO-92 Fixed Through Hole 10.5 V 23 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 168-6797
Mfr. Part No.L7809CV
$0.353
Each (In a Tube of 50)
units
9 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 757-7169
Mfr. Part No.NCP700BSN28T1G
$0.34
Each (In a Pack of 2)
units
2.8 V 200mA TSOP Fixed Surface Mount -0.3 V 6 V 5 - -40 °C +125 °C 1 Positive ±2.5V
RS Stock No. 145-5245
Mfr. Part No.MC7915CD2TR4G
$0.493
Each (On a Reel of 800)
units
-15 V 1A D2PAK Fixed Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 463-290
Mfr. Part No.MC78L05ABDG
$0.536
Each (In a Pack of 25)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 398-647
Mfr. Part No.TS78M05CP ROG
$0.449
Each (In a Pack of 50)
units
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 921-6910
Mfr. Part No.LM340MP-5.0/NOPB
$0.92
Each (On a Reel of 1000)
units
5 V 1A SOT-223 Fixed Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
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