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 168-6809
製造零件編號LM317T
HK$1.873
毎管:50 個
單位
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 714-0792
製造零件編號LM317T
HK$4.179
/個 (每包:10個)
單位
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 298-8558
製造零件編號L7815CV
HK$8.74
單位
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS庫存編號 168-6067
製造零件編號L7915CV
HK$3.141
毎管:50 個
單位
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS庫存編號 168-6061
製造零件編號L7815CV
HK$3.207
毎管:50 個
單位
15 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS庫存編號 298-8621
製造零件編號L7915CV
HK$4.69
單位
-15 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS庫存編號 918-1971
製造零件編號L7805CV
HK$3.207
毎管:50 個
單位
5 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 102-9429
製造零件編號L7805CV-DG
HK$2.168
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 793-1346
製造零件編號L7805CV-DG
HK$3.563
/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 178-5183
製造零件編號L78L15ACZ
HK$0.792
個 (在毎卷:2500)
單位
- - - - - - - - - - - - - -
RS庫存編號 298-8564
製造零件編號L7824CV
HK$8.74
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 168-6062
製造零件編號L7824CV
HK$1.873
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 714-7774
製造零件編號L78L15ACZ
HK$1.546
/個 (每包:50個)
單位
15 V 100mA TO-92 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive ±5%
RS庫存編號 168-6047
製造零件編號LM217T
HK$4.10
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 189-1015
製造零件編號LM217T
HK$5.94
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 298-8508
製造零件編號L7805ACV
HK$4.47
單位
5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%
RS庫存編號 918-1975
製造零件編號L7812CV
HK$3.00
毎管:50 個
單位
12 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 686-9397
製造零件編號L7815CD2T-TR
HK$5.187
/個 (每包:10個)
單位
15 V 1.5A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +150 °C 1 Positive -
RS庫存編號 860-7286
製造零件編號LM317BT
HK$4.068
/個 (每包:10個)
單位
1.2 → 37 V 2.2A TO-220 Adjustable Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive -
RS庫存編號 168-6059
製造零件編號L7805ACV
HK$3.194
毎管:50 個
單位
5 V 1A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive 2%