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. 144-7543
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010378
THB201.61
Each (In a Tube of 42)
Units
3.3 V 1A SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS Stock No. 144-7547
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173950578
THB179.03
Each (In a Tube of 42)
Units
5 V 500mA SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS Stock No. 144-7542
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010342
THB299.56
Each (In a Tube of 42)
Units
3.3 V 1A SIP Fixed Through Hole 7 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS Stock No. 144-7813
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010578
THB217.51
Each
Units
5 V 1A SIP Fixed Through Hole 8 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS Stock No. 144-7817
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173950578
THB189.21
Each
Units
5 V 500mA SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS Stock No. 144-7546
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173950378
THB179.03
Each (In a Tube of 42)
Units
3.3 V 500mA SIP Fixed Through Hole 6 V 28 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS Stock No. 144-7801
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010342
THB329.45
Each
Units
3.3 V 1A SIP Fixed Through Hole 7 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS Stock No. 144-7815
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173950378
THB189.21
Each
Units
3.3 V 500mA SIP Fixed Through Hole 6 V 28 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS Stock No. 144-7545
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010578
THB201.61
Each (In a Tube of 42)
Units
5 V 1A SIP Fixed Through Hole 8 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS Stock No. 144-7809
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010542
THB299.56
Each
Units
5 V 1A SIP Fixed Through Hole 8 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS Stock No. 144-7805
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010378
THB217.51
Each
Units
3.3 V 1A SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS Stock No. 144-7544
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.173010542
THB277.30
Each (In a Tube of 42)
Units
5 V 1A SIP Fixed Through Hole 8 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%