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 163-2415
製造零件編號LM337TG
HK$3.174
毎管:50 個
單位
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS庫存編號 464-104
製造零件編號LM337TG
HK$5.405
/個 (每包:10個)
單位
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - 0 °C +125 °C 1 Negative -
RS庫存編號 103-2162
製造零件編號MC7805ABD2TG
HK$5.065
毎管:50 個
單位
5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS庫存編號 516-5988
製造零件編號MC7805ABD2TG
HK$6.634
/個 (每包:5個)
單位
5 V 2.2A D2PAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS庫存編號 178-4820
製造零件編號MC79L12ACDG
HK$1.913
毎管:98 個
單位
-12 V 100mA SOIC Fixed Surface Mount - -35 V 8 - 0 °C +125 °C 1 Negative -
RS庫存編號 178-4730
製造零件編號MC78M12CTG
HK$3.872
毎管:50 個
單位
12 V 700mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 516-5843
製造零件編號MC7815BTG
HK$4.644
/個 (每包:5個)
單位
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS庫存編號 145-2789
製造零件編號MC7815BTG
HK$3.126
毎管:50 個
單位
15 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS庫存編號 516-4890
製造零件編號MC78M12CTG
HK$12.48
單位
12 V 700mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 163-2480
製造零件編號MC7812CDTRKG
HK$1.853
個 (在毎卷:2500)
單位
12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS庫存編號 688-9250
製造零件編號MC7812CDTRKG
HK$7.625
/個 (每包:2個)
單位
12 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS庫存編號 464-108
製造零件編號LM317MDTG
HK$4.51
/個 (每包:10個)
單位
1.2 → 37 V 250mA DPAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS庫存編號 688-9317
製造零件編號MC79L12ACDG
HK$6.24
/個 (每包:2個)
單位
-12 V 100mA SOIC Fixed Surface Mount - -35 V 8 - 0 °C +125 °C 1 Negative -
RS庫存編號 102-2271
製造零件編號LM317MDTG
HK$3.347
毎管:75 個
單位
1.2 → 37 V 250mA DPAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS庫存編號 145-2791
製造零件編號MC79M12BDTG
HK$3.42
毎管:75 個
單位
-12 V 500mA DPAK Fixed Surface Mount - -35 V 3 - -40 °C +125 °C 1 Negative ±4%
RS庫存編號 463-454
製造零件編號MC7812BTG
HK$4.688
/個 (每包:20個)
單位
12 V 1A TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS庫存編號 463-290
製造零件編號MC78L05ABDG
HK$2.356
/個 (每包:25個)
單位
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS庫存編號 125-0056
製造零件編號MC78M05CDTG
HK$3.203
毎管:75 個
單位
5 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 719-2768
製造零件編號NCP7805TG
HK$3.838
/個 (每包:10個)
單位
5 V 1A TO-220 Fixed Through Hole 7 V 35 V 3 - 0 °C +125 °C 1 - 4%
RS庫存編號 178-4805
製造零件編號MC78M09CDTG
HK$2.72
毎管:75 個
單位
9 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -