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 714-0792
製造零件編號LM317T
TWD16
/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 168-6809
製造零件編號LM317T
TWD7
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 100-3967
製造零件編號LM317LZ/NOPB
TWD10
個 (在毎卷:1800)
單位
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS庫存編號 533-5711
製造零件編號LM317LZ/NOPB
TWD18
單位
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS庫存編號 912-9589
製造零件編號ADP150AUJZ-3.3-R7
TWD17
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
TWD33
/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 661-4611
製造零件編號UA78L10ACPK
TWD7
/個 (每包:10個)
單位
10 V 100mA SOT-89 Fixed Surface Mount 12.5 V 25 V 3 - 0 °C +125 °C 1 Positive ±5%
RS庫存編號 169-8951
製造零件編號TS78M05CP ROG
TWD7
個 (在毎卷:2500)
單位
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS庫存編號 918-1975
製造零件編號L7812CV
TWD10
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 398-647
製造零件編號TS78M05CP ROG
TWD10
/個 (每包:50個)
單位
5 V 500mA TO-252 Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS庫存編號 121-9159
製造零件編號LM317DCY
TWD17
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 661-3627
製造零件編號LM317DCYR
TWD22
/個 (每包:5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 535-9997
製造零件編號LM78L15ACZ/NOPB
TWD22
/個 (每包:5個)
單位
15 V 100mA TO-92 Fixed Through Hole 16.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS庫存編號 102-5719
製造零件編號LM78L15ACZ/NOPB
TWD10
個 (在毎卷:1800)
單位
15 V 100mA TO-92 Fixed Through Hole 16.7 V 35 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS庫存編號 661-6128
製造零件編號LM317DCY
TWD29
/個 (每包:5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 100-5906
製造零件編號LM337T/NOPB
TWD40
毎管:45 個
單位
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole -50 V -4.2 V 3 - 0 °C +125 °C 1 Negative -
RS庫存編號 756-2801
製造零件編號TA48M05F(T6L1,SNQ)
BrandToshiba
TWD25
/個 (每包:5個)
單位
5.25 V 500mA HSOP Fixed Surface Mount 7 V 29 V 3 - -40 °C +150 °C 1 Positive ±5%
RS庫存編號 460-764
製造零件編號LM340T-15/NOPB
TWD54
/個 (每包:5個)
單位
15 V 1A TO-220 Fixed Through Hole 17.7 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS庫存編號 533-8221
製造零件編號LM337T/NOPB
TWD56
單位
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole -50 V -4.2 V 3 - 0 °C +125 °C 1 Negative -
RS庫存編號 100-0703
製造零件編號LM340T-15/NOPB
TWD37
毎管:45 個
單位
15 V 1A TO-220 Fixed Through Hole 17.7 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%