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. 125-0051
Mfr. Part No.MC7812CDTG
SGD0.748
Each (In a Tube of 75)
units
12 V 2.2A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 170-3503
Mfr. Part No.MC79M12BTG
SGD0.682
Each (In a Tube of 50)
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-12 V 500mA TO-220 Fixed Through Hole - -35 V dc 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 884-2552
Mfr. Part No.LT1033CT#PBF
SGD11.085
Each (In a Pack of 2)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 516-5269
Mfr. Part No.LM337BTG
SGD1.32
Each
units
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 178-5053
Mfr. Part No.L7806CD2T-TR
SGD0.433
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 805-6503
Mfr. Part No.MC7812CDTG
SGD0.748
Each (In a Pack of 25)
units
12 V 2.2A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 157-8360
Mfr. Part No.LT1033CT#PBF
SGD6.261
Each (In a Tube of 50)
units
-1.2 → -32 V 3A TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Negative ±1%
RS Stock No. 178-4734
Mfr. Part No.LM337BD2TG
SGD1.415
Each (In a Tube of 50)
units
-37 → -1.2 V 1.5A D2PAK Adjustable Surface Mount - -40 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 121-6354
Mfr. Part No.MC7809ACTG
SGD0.646
Each (In a Tube of 50)
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9 V 2.2A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 184-4293
Mfr. Part No.MC7815ACD2TG
SGD1.051
Each (In a Tube of 50)
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15 V 1A D2PAK Fixed Surface Mount 17 V 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 163-2414
Mfr. Part No.LM337BTG
SGD1.093
Each (In a Tube of 50)
units
-37 → -1.2 V 1.5A TO-220 Adjustable Through Hole - -40 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 810-295
Mfr. Part No.UA78L05ACLP
SGD0.68
Each
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5 V 100mA TO-92 Fixed Through Hole 7 V 20 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 714-0782
Mfr. Part No.LM317D2T-TR
SGD1.304
Each (In a Pack of 5)
units
1.2 → 37 V 1.5A D2PAK Adjustable Surface Mount - 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 661-3772
Mfr. Part No.TPS51200DRCT
SGD1.41
Each
units
-0.1 → 3.5 V 3A SON Adjustable Surface Mount 2.375 V 3.5 V 10 1.92W -40 °C +85 °C 1 Positive -
RS Stock No. 516-5607
Mfr. Part No.LM337BD2TG
SGD1.96
Each
units
-37 → -1.2 V 1.5A D2PAK Adjustable Surface Mount - -40 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 163-2478
Mfr. Part No.MC7805CDTRKG
SGD0.244
Each (On a Reel of 2500)
units
5 V 2.2A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 163-2487
Mfr. Part No.MC78M05BDTRKG
SGD0.226
Each (On a Reel of 2500)
units
5 V 700mA DPAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 877-2750
Mfr. Part No.LM317T-DG
SGD0.942
Each (In a Pack of 25)
units
1.2 → 37 V 500mA TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6049
Mfr. Part No.L78L05ACZ
SGD0.137
Each (In a Bag of 2500)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 100-3969
Mfr. Part No.LM337LZ/NOPB
SGD0.553
Each (On a Reel of 1800)
units
-37 → -1.2 V 100mA TO-92 Adjustable Through Hole -40 V -4.2 V 3 0.625W -25 °C +125 °C 1 Negative -
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