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. 921-5056
Mfr. Part No.LM317MQDCYR
R 6.106
Each (On a Reel of 2500)
units
1.25 → 37 V 500mA Adjustable SOT-223 Surface Mount 3 V 40 V 3+Tab - -40 °C +125 °C 1 Positive -
RS stock no. 464-114
Mfr. Part No.MC78M12CDTG
R 4.862
Each (In a Pack of 20)
units
12 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 625-6338
Mfr. Part No.MC78M05ABDTG
R 11.284
Each (In a Pack of 5)
units
5 V 700mA Fixed D-PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS stock no. 796-8060
Mfr. Part No.LM7805CT/NOPB
R 26.74
Each (In a Pack of 5)
units
5 V 1A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +70 °C 1 Positive -
RS stock no. 489-3654
Mfr. Part No.CSR1004B
R 530.62
Each
units
230 V 10A Adjustable - Through Hole - 230 V 3 - 0 °C +70 °C 1 - -
RS stock no. 922-2369
Mfr. Part No.LM7805CT/NOPB
R 22.772
Each (In a Tube of 45)
units
5 V 1A Fixed TO-220 Through Hole 7.5 V 35 V 3 - 0 °C +70 °C 1 Positive -
RS stock no. 145-5382
Mfr. Part No.KA317TU
R 6.435
Each (In a Tube of 50)
units
1.2 → 37 V 2.2A Adjustable TO-220 Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 163-2487
Mfr. Part No.MC78M05BDTRKG
R 2.77
Each (On a Reel of 2500)
units
5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS stock no. 125-0057
Mfr. Part No.MC78M12CDTG
R 6.24
Each (In a Tube of 75)
units
12 V 700mA Fixed DPAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 805-6515
Mfr. Part No.MC7815CD2TG
R 10.99
Each (In a Pack of 20)
units
15 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 145-2948
Mfr. Part No.MC7815CD2TG
R 9.204
Each (In a Tube of 50)
units
15 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS stock no. 169-8184
Mfr. Part No.NJM78L03UA-TE1
R 3.936
Each (On a Reel of 1000)
units
3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 0.3W -40 °C +85 °C 1 Positive -
RS stock no. 713-9509
Mfr. Part No.NJM78L03UA-TE1
R 6.76
Each (In a Pack of 5)
units
3 V 100mA Fixed SOT-89 Surface Mount - 30 V 3 0.3W -40 °C +85 °C 1 Positive -
RS stock no. 298-8621
Mfr. Part No.L7915CV
R 11.28
Each
units
-15 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS stock no. 103-3895
Mfr. Part No.MC78M05ABDTG
R 9.196
Each (In a Tube of 75)
units
5 V 700mA Fixed DPAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS stock no. 168-6066
Mfr. Part No.L7905CV
R 8.191
Each (In a Tube of 50)
units
-5 V 1.5A Fixed TO-220 Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS stock no. 751-3102
Mfr. Part No.AP7333-33SAG-7
R 5.655
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. 748-5275
Mfr. Part No.NCV59302DSADJR4G
R 21.42
Each
units
1.24 → 13 V 3A Adjustable D2PAK Surface Mount 2.24 V 13.5 V 5 - -40 °C +125 °C 1 Positive ±1%
RS stock no. 145-0774
Mfr. Part No.LM317LCD
R 6.406
Each (In a Tube of 75)
units
32 V 100mA Adjustable SOIC Surface Mount 5 V 35 V 8 - 0 °C +125 °C 1 Positive -
RS stock no. 169-8180
Mfr. Part No.NJM7815DL1A-TE1
R 6.29
Each (On a Reel of 3000)
units
15 V 1.5A Fixed TO-252 Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -