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庫存編號 144-7542
製造零件編號173010342
HK$79.18
毎管:42 個
單位
3.3 V 1A SIP Fixed Through Hole 7 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS庫存編號 144-7813
製造零件編號173010578
HK$59.84
單位
5 V 1A SIP Fixed Through Hole 8 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS庫存編號 144-7544
製造零件編號173010542
HK$74.62
毎管:42 個
單位
5 V 1A SIP Fixed Through Hole 8 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS庫存編號 144-7543
製造零件編號173010378
HK$52.616
毎管:42 個
單位
3.3 V 1A SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS庫存編號 144-7809
製造零件編號173010542
HK$80.61
單位
5 V 1A SIP Fixed Through Hole 8 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS庫存編號 144-7805
製造零件編號173010378
HK$57.53
單位
3.3 V 1A SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS庫存編號 144-7815
製造零件編號173950378
HK$47.37
單位
3.3 V 500mA SIP Fixed Through Hole 6 V 28 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS庫存編號 144-7546
製造零件編號173950378
HK$44.16
毎管:42 個
單位
3.3 V 500mA SIP Fixed Through Hole 6 V 28 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS庫存編號 144-7801
製造零件編號173010342
HK$87.13
單位
3.3 V 1A SIP Fixed Through Hole 7 V 42 V 3 5W -40 °C +85 °C 1 Positive ±2%
RS庫存編號 144-7545
製造零件編號173010578
HK$49.462
毎管:42 個
單位
5 V 1A SIP Fixed Through Hole 8 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS庫存編號 144-7817
製造零件編號173950578
HK$56.59
單位
5 V 500mA SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%
RS庫存編號 144-7547
製造零件編號173950578
HK$44.16
毎管:42 個
單位
5 V 500mA SIP Fixed Through Hole 7 V 28 V 3 5W -40 °C +85 °C 1 Positive 3.5%