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 157-8360
製造零件編號LT1033CT#PBF
HK$34.897
毎管:50 個
單位
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS庫存編號 884-2552
製造零件編號LT1033CT#PBF
HK$48.67
/個 (每包:2個)
單位
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS庫存編號 155-5383
製造零件編號LT317AT#PBF
HK$26.192
毎管:50 個
單位
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 779-9628
製造零件編號LT317AT#PBF
HK$33.055
/個 (每包:2個)
單位
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS庫存編號 912-9589
製造零件編號ADP150AUJZ-3.3-R7
HK$4.321
個 (在毎卷:3000)
單位
3.3 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS庫存編號 742-7691
製造零件編號ADP150AUJZ-3.3-R7
HK$7.154
/個 (每包:5個)
單位
3.3 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS庫存編號 779-9619
製造零件編號LT337AT#PBF
HK$32.07
/個 (每包:2個)
單位
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Negative -
RS庫存編號 155-5379
製造零件編號LT337AT#PBF
HK$25.714
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 Negative -
RS庫存編號 714-0792
製造零件編號LM317T
HK$4.404
/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 100-0719
製造零件編號LM338T/NOPB
HK$12.392
毎管:45 個
單位
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS庫存編號 460-900
製造零件編號LM338T/NOPB
HK$15.324
/個 (每包:5個)
單位
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS庫存編號 168-6809
製造零件編號LM317T
HK$3.091
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 298-8621
製造零件編號L7915CV
HK$11.43
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$2.518
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 298-8558
製造零件編號L7815CV
HK$10.92
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 162-6327
製造零件編號LP2998MR/NOPB
HK$12.984
毎管:95 個
單位
- 1.5A PSOP Adjustable Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
RS庫存編號 761-6567
製造零件編號LP2998MR/NOPB
HK$16.96
/個 (每包:5個)
單位
- 1.5A PSOP Adjustable Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
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 922-8317
製造零件編號AP7333-33SAG-7
HK$0.832
個 (在毎卷:3000)
單位
3.3 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS庫存編號 918-1971
製造零件編號L7805CV
HK$3.267
毎管:50 個
單位
5 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -