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 Output Type Package 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. 751-2890
Mfr. Part No.AP1117E33G-13
R 3.486
Each (In a Pack of 50)
units
3.3 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS stock no. 922-8285
Mfr. Part No.AP1117E33G-13
R 1.972
Each (On a Reel of 2500)
units
3.3 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS stock no. 922-8474
Mfr. Part No.ZLDO1117G33TA
R 3.033
Each (On a Reel of 1000)
units
3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS stock no. 751-5183
Mfr. Part No.ZLDO1117G33TA
R 6.396
Each (In a Pack of 25)
units
3.3 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS stock no. 922-7645
Mfr. Part No.ZMR500FTA
R 6.586
Each (On a Reel of 3000)
units
5 V 50mA Fixed SOT-23 Surface Mount 7 V 25 V 3 0.5W -55 °C +125 °C 1 Positive -
RS stock no. 155-080
Mfr. Part No.ZMR500FTA
R 8.95
Each (In a Pack of 10)
units
5 V 50mA Fixed SOT-23 Surface Mount 7 V 25 V 3 0.5W -55 °C +125 °C 1 Positive -
RS stock no. 751-2894
Mfr. Part No.AP1117E50G-13
R 3.295
Each (In a Pack of 50)
units
5 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS stock no. 922-8288
Mfr. Part No.AP1117E50G-13
R 1.972
Each (On a Reel of 2500)
units
5 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS stock no. 922-8317
Mfr. Part No.AP7333-33SAG-7
R 1.805
Each (On a Reel of 3000)
units
3.3 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS stock no. 751-3102
Mfr. Part No.AP7333-33SAG-7
R 5.368
Each (In a Pack of 50)
units
3.3 V 300mA Fixed SOT-23 Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS stock no. 122-3393
Mfr. Part No.AZ1117H-5.0TRE1
R 1.551
Each (On a Reel of 4000)
units
5 V 1A Fixed SOT-223 Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS stock no. 122-3376
Mfr. Part No.AS78L15RTR-G1
R 1.585
Each (On a Reel of 1000)
units
15 V 100mA Fixed SOT-89 Surface Mount - 36 V 3 750mW -40 °C +125 °C 1 Positive ±5%
RS stock no. 751-3106
Mfr. Part No.AP7333-33SRG-7
R 5.12
Each (In a Pack of 50)
units
3.3 V 300mA Fixed SOT-23R Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS stock no. 122-0825
Mfr. Part No.AP7333-33SRG-7
R 1.803
Each (On a Reel of 3000)
units
3.3 V 300mA Fixed SOT-23R Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS stock no. 885-5432
Mfr. Part No.AZ1117H-5.0TRE1
R 2.401
Each (In a Pack of 50)
units
5 V 1A Fixed SOT-223 Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS stock no. 828-7561
Mfr. Part No.AS78L15RTR-G1
R 2.283
Each (In a Pack of 50)
units
15 V 100mA Fixed SOT-89 Surface Mount - 36 V 3 750mW -40 °C +125 °C 1 Positive ±5%
RS stock no. 710-6310
Mfr. Part No.ZSR1000GTA
R 18.082
Each (In a Pack of 5)
units
10 V 200mA Fixed SOT-223 Surface Mount 12 V 20 V 3+Tab 2W -55 °C +125 °C 1 Positive 2.5%
RS stock no. 751-5170
Mfr. Part No.ZLDO1117G18TA
R 6.674
Each (In a Pack of 25)
units
1.8 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS stock no. 122-1244
Mfr. Part No.ZLDO1117G18TA
R 2.779
Each (On a Reel of 1000)
units
1.8 V 1A Fixed SOT-223 Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS stock no. 122-0620
Mfr. Part No.ZSR1000GTA
R 8.264
Each (On a Reel of 1000)
units
10 V 200mA Fixed SOT-223 Surface Mount 12 V 20 V 3+Tab 2W -55 °C +125 °C 1 Positive 2.5%