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. 884-2552
Mfr. Part No.LT1033CT#PBF
HK$48.155
Each (In a Pack of 2)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 157-8360
Mfr. Part No.LT1033CT#PBF
HK$37.596
Each (In a Tube of 50)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 779-9628
Mfr. Part No.LT317AT#PBF
HK$35.37
Each (In a Pack of 2)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 155-5383
Mfr. Part No.LT317AT#PBF
HK$27.423
Each (In a Tube of 50)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 912-9589
Mfr. Part No.ADP150AUJZ-3.3-R7
HK$4.321
Each (On a Reel of 3000)
units
3.3 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 742-7691
Mfr. Part No.ADP150AUJZ-3.3-R7
HK$7.154
Each (In a Pack of 5)
units
3.3 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 779-9619
Mfr. Part No.LT337AT#PBF
HK$34.56
Each (In a Pack of 2)
units
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 155-5379
Mfr. Part No.LT337AT#PBF
HK$26.006
Each (In a Tube of 50)
units
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
HK$12.392
Each (In a Tube of 45)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6809
Mfr. Part No.LM317T
HK$1.873
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 460-900
Mfr. Part No.LM338T/NOPB
HK$15.324
Each (In a Pack of 5)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 714-0792
Mfr. Part No.LM317T
HK$4.179
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6061
Mfr. Part No.L7815CV
HK$3.207
Each (In a Tube of 50)
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 761-6567
Mfr. Part No.LP2998MR/NOPB
HK$16.96
Each (In a Pack of 5)
units
- 1.5A PSOP Adjustable Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
RS Stock No. 298-8558
Mfr. Part No.L7815CV
HK$3.98
Each
units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 298-8621
Mfr. Part No.L7915CV
HK$4.69
Each
units
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 168-6067
Mfr. Part No.L7915CV
HK$3.141
Each (In a Tube of 50)
units
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 162-6327
Mfr. Part No.LP2998MR/NOPB
HK$12.984
Each (In a Tube of 95)
units
- 1.5A PSOP Adjustable Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
RS Stock No. 922-8317
Mfr. Part No.AP7333-33SAG-7
HK$0.832
Each (On a Reel of 3000)
units
3.3 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 918-1971
Mfr. Part No.L7805CV
HK$3.207
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
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