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. 922-8317
Mfr. Part No.AP7333-33SAG-7
HK$0.958
Each (On a Reel of 3000)
units
3.3 V 300mA SOT-23 Fixed 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
HK$2.73
Each (In a Pack of 50)
units
3.3 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 828-7555
Mfr. Part No.AS78L05MTR-G1
HK$2.596
Each (In a Pack of 50)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 750mW -40 °C +125 °C 1 Positive ±5%
RS Stock No. 122-3375
Mfr. Part No.AS78L05MTR-G1
HK$0.762
Each (On a Reel of 4000)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 750mW -40 °C +125 °C 1 Positive ±5%
RS Stock No. 922-8474
Mfr. Part No.ZLDO1117G33TA
HK$1.61
Each (On a Reel of 1000)
units
3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 146-0587
Mfr. Part No.AS78L05ZTR-E1
HK$0.496
Each (On a Tape of 2000)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS Stock No. 885-5423
Mfr. Part No.AS78L05ZTR-E1
HK$0.864
Each (In a Pack of 100)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive ±5%
RS Stock No. 885-5432
Mfr. Part No.AZ1117H-5.0TRE1
HK$2.72
Each (In a Pack of 50)
units
5 V 1A SOT-223 Fixed Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 922-8285
Mfr. Part No.AP1117E33G-13
HK$1.04
Each (On a Reel of 2500)
units
3.3 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 122-3393
Mfr. Part No.AZ1117H-5.0TRE1
HK$0.813
Each (On a Reel of 4000)
units
5 V 1A SOT-223 Fixed Surface Mount - 15 V 3+Tab - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 751-5183
Mfr. Part No.ZLDO1117G33TA
HK$3.41
Each (In a Pack of 25)
units
3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 751-2890
Mfr. Part No.AP1117E33G-13
HK$2.95
Each (In a Pack of 50)
units
3.3 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 122-0382
Mfr. Part No.AP7331-WG-7
HK$1.06
Each (On a Reel of 3000)
units
0.8 → 5 V 300mA SOT-25 Adjustable Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 710-6322
Mfr. Part No.ZSR330GTA
HK$9.58
Each (In a Pack of 5)
units
3.3 V 200mA SOT-223 Fixed Surface Mount 5.3 V 20 V 3+Tab 2W -55 °C +125 °C 1 Positive 2.5%
RS Stock No. 122-1250
Mfr. Part No.ZLDO1117KTC
HK$1.693
Each (On a Reel of 2500)
units
1.2 → 5 V 1A TO-252 Adjustable Surface Mount 2.7 V 18 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 122-0617
Mfr. Part No.AP78L05YG-13
HK$1.217
Each (On a Reel of 2500)
units
5 V 100mA SOT-89 Fixed Surface Mount 7 V 20 V 3 - -20 °C +85 °C 1 Positive ±5%
RS Stock No. 751-5186
Mfr. Part No.ZLDO1117G50TA
HK$3.41
Each (In a Pack of 25)
units
5 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 122-0383
Mfr. Part No.AP7331-30WG-7
HK$1.06
Each (On a Reel of 3000)
units
3 V 300mA SOT-25 Fixed Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 710-6256
Mfr. Part No.AP78L05YG-13
HK$2.04
Each (In a Pack of 20)
units
5 V 100mA SOT-89 Fixed Surface Mount 7 V 20 V 3 - -20 °C +85 °C 1 Positive ±5%
RS Stock No. 155-125
Mfr. Part No.ZSR500GTA
HK$9.58
Each (In a Pack of 5)
units
5 V 200mA SOT-223 Fixed Surface Mount 7 V 20 V 3+Tab 2W -55 °C +125 °C 1 Positive 2.5%