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 Stock No. 157-8360
Mfr. Part No.LT1033CT#PBF
HK$39.06
Each (In a Tube of 50)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 884-2552
Mfr. Part No.LT1033CT#PBF
HK$58.82
Each (In a Pack of 2)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 779-9628
Mfr. Part No.LT317AT#PBF
HK$42.31
Each (In a Pack of 2)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 155-5383
Mfr. Part No.LT317AT#PBF
HK$27.423
Each (In a Tube of 50)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 742-7691
Mfr. Part No.ADP150AUJZ-3.3-R7
HK$8.64
Each (In a Pack of 5)
units
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 Stock No. 912-9589
Mfr. Part No.ADP150AUJZ-3.3-R7
HK$4.68
Each (On a Reel of 3000)
units
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 Stock No. 155-5379
Mfr. Part No.LT337AT#PBF
HK$27.388
Each (In a Tube of 50)
units
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 779-9619
Mfr. Part No.LT337AT#PBF
HK$42.31
Each (In a Pack of 2)
units
-1.2 → -37 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 912-9696
Mfr. Part No.ADP2108AUJZ-3.3-R7
HK$9.249
Each (On a Reel of 3000)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 759-1809
Mfr. Part No.ADP2108AUJZ-3.3-R7
HK$15.244
Each (In a Pack of 5)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 159-8045
Mfr. Part No.ADP150ACBZ-3.3-R7
HK$4.525
Each (On a Reel of 3000)
units
3.3 V 150mA WLCSP Fixed Surface Mount 2.2 V 5.5 V 4 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 912-8087
Mfr. Part No.ADM7150ARDZ-3.3
HK$55.79
Each (In a Tube of 98)
units
3.3 V 800mA SOIC Fixed Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 912-9618
Mfr. Part No.ADP150AUJZ-2.8-R7
HK$4.68
Each (On a Reel of 3000)
units
2.8 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 862-6461
Mfr. Part No.HMC976LP3E
HK$85.31
Each
units
5 V 400mA QFN Adjustable Surface Mount 3.3 V 5.5 V 16 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 145-7242
Mfr. Part No.HMC976LP3E
HK$73.50
Each (On a Reel of 50)
units
5 V 400mA QFN Adjustable Surface Mount 3.3 V 5.5 V 16 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 798-9944
Mfr. Part No.ADM7150ARDZ-3.3
HK$70.17
Each
units
3.3 V 800mA SOIC Fixed Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 742-7746
Mfr. Part No.ADP150AUJZ-2.8-R7
HK$8.64
Each (On a Tape of 5)
units
2.8 V 150mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 742-7730
Mfr. Part No.ADP150ACBZ-3.3-R7
HK$8.64
Each (In a Pack of 5)
units
3.3 V 150mA WLCSP Fixed Surface Mount 2.2 V 5.5 V 4 - -40 °C +125 °C 1 Positive -2.5 → 1.5%
RS Stock No. 912-9624
Mfr. Part No.ADP151AUJZ-3.3-R7
HK$4.97
Each (On a Reel of 3000)
units
3.3 V 200mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2.5%
RS Stock No. 183-2279
Mfr. Part No.ADP151ACBZ-3.3-R7
HK$4.828
Each (On a Reel of 3000)
units
3.3 V 200mA WLCSP Fixed Surface Mount 2.2 V 5.5 V 4 - -40 °C +125 °C 1 - ±2%