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. 922-8288
Mfr. Part No.AP1117E50G-13
MYR0.495
Each (On a Reel of 2500)
units
5 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 126-6368
Mfr. Part No.UA723CN
MYR2.20
Each
units
2 → 37 V 150mA PDIP Adjustable Through Hole 9.5 V 40 V 14 - 0 °C +70 °C 1 Positive ±10%
RS Stock No. 516-5269
Mfr. Part No.LM337BTG
MYR3.72
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. 102-5710
Mfr. Part No.LM350T/NOPB
MYR5.236
Each (In a Tube of 45)
units
1.2 → 33 V 3A TO-220 Adjustable Through Hole 4.2 V 35 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 166-1981
Mfr. Part No.MC7805ECDTX
MYR1.896
Each (On a Reel of 2000)
units
5 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 806-4103
Mfr. Part No.MC7805ECDTX
MYR2.196
Each (In a Pack of 20)
units
5 V 1A DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 751-2894
Mfr. Part No.AP1117E50G-13
MYR1.003
Each (In a Pack of 50)
units
5 V 1A SOT-223 Fixed Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 535-9408
Mfr. Part No.LM350T/NOPB
MYR6.762
Each (In a Pack of 5)
units
1.2 → 33 V 3A TO-220 Adjustable Through Hole 4.2 V 35 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 163-2414
Mfr. Part No.LM337BTG
MYR2.575
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. 145-0100
Mfr. Part No.UA723CN
MYR2.204
Each (In a Tube of 25)
units
2 → 37 V 150mA PDIP Adjustable Through Hole 9.5 V 40 V 14 - 0 °C +70 °C 1 Positive ±10%
RS Stock No. 772-6645
Mfr. Part No.UPC1093T-E1-AZ
MYR1.741
Each (On a Reel of 15)
units
36 V 150mA SOT-89 Adjustable Surface Mount 2.44 V 2.55 V 3 2W -20 °C +85 °C 1 Positive ±2%
RS Stock No. 536-0010
Mfr. Part No.LM79L12ACZ/NOPB
MYR3.068
Each (In a Pack of 5)
units
-12 V 100mA TO-92 Fixed Through Hole -35 V -14.6 V 3 - 0 °C +70 °C 1 Negative -
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
MYR2.787
Each (In a Pack of 10)
units
5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 534-3885
Mfr. Part No.LM7905CT/NOPB
MYR6.38
Each
units
-5 V 1.5A TO-220 Fixed Through Hole - -10 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 661-6730
Mfr. Part No.UA78M05IDCY
MYR2.048
Each (In a Pack of 5)
units
5 V 500mA SOT-223 Fixed Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
MYR6.916
Each (In a Tube of 45)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 633-026
Mfr. Part No.L78S05CV
BrandMagnatec
MYR5.68
Each
units
5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 170-4344
Mfr. Part No.LR8N3-G
BrandMicrochip
MYR1.89
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 671-0299
Mfr. Part No.LM350T
MYR5.882
Each (In a Pack of 5)
units
1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 124-1691
Mfr. Part No.LM350T
MYR3.359
Each (In a Tube of 50)
units
1.2 → 33 V 3A TO-220AB Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
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