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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รายละเอียดสินค้า / Description ราคา / 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. 168-6809
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM317T
THB16.412
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. 178-2344
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.NJM7805FA
THB15.80
Each (In a Bag of 100)
Units
- - - - - - - - - - - - - -
RS Stock No. 657-1003
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.NJM7805FA
THB32.548
Each: (In a Pack of 5)
Units
5 V 1.5A TO-220F Fixed Through Hole - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 714-0792
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM317T
THB16.70
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. 168-6607
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L7815ABV
THB12.965
Each (In a Tube of 50)
Units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 686-9802
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L7815ABV
THB12.638
Each: (In a Pack of 25)
Units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 178-8869
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM78L15ACM/NOPB
THB26.046
Each (In a Tube of 95)
Units
- - - - - - - - - - - - - -
RS Stock No. 536-1417
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM78L15ACM/NOPB
THB25.10
Each
Units
15 V 100mA SOIC Fixed Surface Mount 16.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 168-6061
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L7815CV
THB12.454
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. 298-8558
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L7815CV
THB15.31
Each
Units
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9454
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L78L12ACUTR
THB10.434
Each: (In a Pack of 25)
Units
12 V 100mA SOT-89 Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 178-5142
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L78L12ACUTR
THB3.886
Each (On a Reel of 2500)
Units
- - - - - - - - - - - - - -
RS Stock No. 145-2789
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MC7815BTG
THB15.023
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. 516-5843
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MC7815BTG
THB17.77
Each: (In a Pack of 5)
Units
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 460-900
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM338T/NOPB
THB65.626
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. 751-3073
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AP7331-25WG-7
Brand :DiodesZetex
THB11.064
Each (On a Tape of 50)
Units
2.5 V 300mA SOT-25 Fixed Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 124-1691
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM350T
THB20.056
Each (In a Tube of 50)
Units
1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 169-0662
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AP7331-25WG-7
Brand :DiodesZetex
THB3.94
Each (On a Reel of 3000)
Units
2.5 V 300mA SOT-25 Fixed Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 536-1394
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM78L05ACM/NOPB
THB28.19
Each
Units
5 V 100mA SOIC Fixed Surface Mount 6.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 918-1975
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L7812CV
THB11.689
Each (In a Tube of 50)
Units
12 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
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