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. 661-6128
Mfr. Part No.LM317DCY
HK$5.938
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 102-5754
Mfr. Part No.LM78L12ACM/NOPB
HK$4.435
Each (In a Tube of 95)
units
12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 163-2480
Mfr. Part No.MC7812CDTRKG
HK$1.83
Each (On a Reel of 2500)
units
12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 536-1401
Mfr. Part No.LM78L12ACM/NOPB
HK$6.39
Each
units
12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 688-9250
Mfr. Part No.MC7812CDTRKG
HK$4.80
Each (In a Pack of 2)
units
12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 145-2789
Mfr. Part No.MC7815BTG
HK$3.839
Each (In a Tube of 50)
units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 168-6047
Mfr. Part No.LM217T
HK$4.10
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS Stock No. 168-6062
Mfr. Part No.L7824CV
HK$1.873
Each (In a Tube of 50)
units
24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 688-9317
Mfr. Part No.MC79L12ACDG
HK$3.51
Each (In a Pack of 2)
units
-12 V 100mA SOIC Fixed Surface Mount - -35 V 8 - 0 °C +125 °C 1 Negative -
RS Stock No. 793-1346
Mfr. Part No.L7805CV-DG
HK$3.563
Each (In a Pack of 10)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 102-2271
Mfr. Part No.LM317MDTG
HK$3.347
Each (In a Tube of 75)
units
1.2 → 37 V 250mA DPAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 102-9429
Mfr. Part No.L7805CV-DG
HK$2.168
Each (In a Tube of 50)
units
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 759-1809
Mfr. Part No.ADP2108AUJZ-3.3-R7
HK$13.50
Each (In a Pack of 5)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
HK$5.654
Each (In a Pack of 10)
units
5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 298-8508
Mfr. Part No.L7805ACV
HK$4.47
Each
units
5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS Stock No. 178-8831
Mfr. Part No.LM79L12ACM/NOPB
HK$6.299
Each (In a Tube of 95)
units
-12 V 100mA SOIC Fixed Surface Mount -35 V -14.6 V 8 - 0 °C +70 °C 1 Negative -
RS Stock No. 912-9696
Mfr. Part No.ADP2108AUJZ-3.3-R7
HK$9.249
Each (On a Reel of 3000)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 145-0842
Mfr. Part No.TL780-15KCS
HK$4.142
Each (In a Tube of 50)
units
15 V 1.5A TO-220 Fixed Through Hole 17.5 V 30 V 3 - 0 °C +125 °C 1 Positive ±1%
RS Stock No. 739-0464
Mfr. Part No.KA7815ETU
HK$6.378
Each (In a Pack of 5)
units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
HK$10.616
Each (In a Tube of 45)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
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