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. 751-3102
Mfr. Part No.AP7333-33SAG-7
HK$2.017
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. 922-8317
Mfr. Part No.AP7333-33SAG-7
HK$0.832
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. 122-3375
Mfr. Part No.AS78L05MTR-G1
HK$0.696
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. 828-7555
Mfr. Part No.AS78L05MTR-G1
HK$1.34
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. 146-0587
Mfr. Part No.AS78L05ZTR-E1
HK$0.347
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. 122-3393
Mfr. Part No.AZ1117H-5.0TRE1
HK$0.574
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. 751-2890
Mfr. Part No.AP1117E33G-13
HK$2.059
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. 751-5183
Mfr. Part No.ZLDO1117G33TA
HK$3.409
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. 922-8474
Mfr. Part No.ZLDO1117G33TA
HK$1.643
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. 922-8285
Mfr. Part No.AP1117E33G-13
HK$0.822
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. 885-5432
Mfr. Part No.AZ1117H-5.0TRE1
HK$2.116
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. 885-5423
Mfr. Part No.AS78L05ZTR-E1
HK$0.825
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. 122-3332
Mfr. Part No.ZXTR1005PD8-13
HK$2.284
Each (On a Reel of 2500)
units
5.1 V 50mA PowerDI 5060 Fixed Surface Mount 10 V 100 V 8 1.84W -55 °C +125 °C 1 Positive ±2%
RS Stock No. 751-5196
Mfr. Part No.ZLDO1117K50TC
HK$4.536
Each (In a Pack of 25)
units
5 V 1A TO-252 Fixed Surface Mount 2.7 V 18 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 751-3061
Mfr. Part No.AP7331-12WG-7
HK$1.755
Each (On a Tape of 50)
units
1.2 V 300mA SOT-25 Fixed Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 122-3334
Mfr. Part No.ZXTR2005K-13
HK$1.866
Each (On a Reel of 2500)
units
5.5 V 50mA TO-252 Fixed Surface Mount 10 V 100 V 3 2.3W -40 °C +125 °C 1 Positive ±10%
RS Stock No. 166-0434
Mfr. Part No.AP1117E25G-13
HK$0.82
Each (On a Reel of 2500)
units
2.5 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 122-0620
Mfr. Part No.ZSR1000GTA
HK$4.784
Each (On a Reel of 1000)
units
10 V 200mA SOT-223 Fixed Surface Mount 12 V 20 V 3+Tab 2W -55 °C +125 °C 1 Positive 2.5%
RS Stock No. 751-3099
Mfr. Part No.AP7333-25SAG-7
HK$1.508
Each (On a Tape of 50)
units
2.5 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 122-0376
Mfr. Part No.AP7311-WG-7
HK$1.005
Each (On a Reel of 3000)
units
0.8 → 5 V 150mA SOT-25 Adjustable Surface Mount 2 V 6 V 5 - -40 °C +85 °C 1 Positive ±2%