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 918-1971
製造零件編號L7805CV
HK$3.192
毎管:50 個
單位
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 516-5988
製造零件編號MC7805ABD2TG
HK$6.58
/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 464-104
製造零件編號LM337TG
HK$5.469
/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$6.166
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 163-2415
製造零件編號LM337TG
HK$3.176
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 189-1015
製造零件編號LM217T
HK$6.79
單位
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS庫存編號 145-2789
製造零件編號MC7815BTG
HK$3.914
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 121-9159
製造零件編號LM317DCY
HK$4.798
毎管:80 個
單位
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庫存編號 527-974
製造零件編號UA78L05ACDR
HK$2.242
/個 (每包:25個)
單位
5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS庫存編號 178-4820
製造零件編號MC79L12ACDG
HK$2.65
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 168-6062
製造零件編號L7824CV
HK$2.342
毎管:50 個
單位
24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS庫存編號 298-8564
製造零件編號L7824CV
HK$3.97
單位
24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS庫存編號 688-9317
製造零件編號MC79L12ACDG
HK$3.51
/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 661-6709
製造零件編號UA78L05ACD
HK$2.82
/個 (每包:10個)
單位
5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS庫存編號 168-6047
製造零件編號LM217T
HK$5.187
毎管:50 個
單位
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole - - 3 - -25 °C +150 °C 1 Positive -
RS庫存編號 163-2480
製造零件編號MC7812CDTRKG
HK$1.83
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 793-1346
製造零件編號L7805CV-DG
HK$4.141
/個 (每包:10個)
單位
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS庫存編號 102-9429
製造零件編號L7805CV-DG
HK$4.151
毎管:50 個
單位
5 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS庫存編號 122-3375
製造零件編號AS78L05MTR-G1
HK$0.762
個 (在毎卷:4000)
單位
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 750mW -40 °C +125 °C 1 Positive ±5%
RS庫存編號 464-108
製造零件編號LM317MDTG
HK$4.019
/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%