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. 298-8514
Mfr. Part No.L7805CV
R 7.98
Each
units
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS stock no. 918-1971
Mfr. Part No.L7805CV
R 5.579
Each (In a Tube of 50)
units
5 V 1.5A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 714-0792
Mfr. Part No.LM317T
R 6.769
Each (In a Pack of 10)
units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 168-6809
Mfr. Part No.LM317T
R 9.251
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A Adjustable TO-220 Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 460-900
Mfr. Part No.LM338T/NOPB
R 49.36
Each (In a Pack of 5)
units
1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS stock no. 168-6578
Mfr. Part No.L78L33ABZ-AP
R 1.546
Each (On a Tape of 2000)
units
3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 100-0719
Mfr. Part No.LM338T/NOPB
R 31.93
Each (In a Tube of 45)
units
1.2 → 32 V 5A Adjustable TO-220 Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS stock no. 686-9552
Mfr. Part No.L78L33ABZ-AP
R 4.687
Each (In a Pack of 25)
units
3.3 V 100mA Fixed TO-92 Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 918-1975
Mfr. Part No.L7812CV
R 5.382
Each (In a Tube of 50)
units
12 V 1.5A Fixed TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 165-7768
Mfr. Part No.L79L05ABD13TR
R 1.787
Each (On a Reel of 2500)
units
-5 V 100mA Fixed SOIC Surface Mount - -30 V 8 - -40 °C +125 °C 1 Negative -
RS stock no. 686-9492
Mfr. Part No.L79L05ABD13TR
R 5.251
Each (In a Pack of 25)
units
-5 V 100mA Fixed SOIC Surface Mount - -30 V 8 - -40 °C +125 °C 1 Negative -
RS stock no. 704-4016
Mfr. Part No.LM7809CT
R 10.898
Each (In a Pack of 5)
units
9 V 1A Fixed TO-220 Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS stock no. 922-8285
Mfr. Part No.AP1117E33G-13
R 2.097
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. 751-2890
Mfr. Part No.AP1117E33G-13
R 4.291
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. 102-5703
Mfr. Part No.LM317HVT/NOPB
R 36.632
Each (In a Tube of 45)
units
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS stock no. 184-4293
Mfr. Part No.MC7815ACD2TG
R 11.355
Each (In a Tube of 50)
units
15 V 1A Fixed D2PAK Surface Mount 17 V 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 535-9054
Mfr. Part No.LM317HVT/NOPB
R 42.132
Each (In a Pack of 5)
units
1.2 → 57 V 1.5A Adjustable TO-220 Through Hole 4.2 V 60 V 3 20W 0 °C +125 °C 1 Positive -
RS stock no. 102-2270
Mfr. Part No.LM317D2TG
R 10.986
Each (In a Tube of 50)
units
1.2 → 37 V 1.5A Adjustable D2PAK Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 922-8474
Mfr. Part No.ZLDO1117G33TA
R 3.203
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. 463-650
Mfr. Part No.MC7805CDTG
R 9.066
Each (In a Pack of 20)
units
5 V 1A Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%