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. 102-3493
Mfr. Part No.MC7824CTG
MYR1.991
Each (In a Tube of 50)
units
24 V 1A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 178-5063
Mfr. Part No.LM317D2T-TR
MYR1.545
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 155-5383
Mfr. Part No.LT317AT#PBF
MYR14.588
Each (In a Tube of 50)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 714-0782
Mfr. Part No.LM317D2T-TR
MYR3.152
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. 779-9628
Mfr. Part No.LT317AT#PBF
MYR17.645
Each (In a Pack of 2)
units
5 → 40 V 1.5A TO-220 Adjustable Through Hole 3 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 162-9417
Mfr. Part No.MC78M06CTG
MYR1.208
Each (In a Tube of 50)
units
6 V 700mA TO-220 Fixed Through Hole - 40 V dc 3 5W 0 °C +125 °C 1 Positive -
RS Stock No. 785-7030
Mfr. Part No.MC78M06CTG
MYR1.624
Each (In a Pack of 10)
units
6 V 700mA TO-220 Fixed Through Hole - 40 V dc 3 5W 0 °C +125 °C 1 Positive -
RS Stock No. 460-764
Mfr. Part No.LM340T-15/NOPB
MYR5.946
Each (In a Pack of 5)
units
15 V 1A TO-220 Fixed Through Hole 17.7 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 661-3621
Mfr. Part No.LM317KTTR
MYR2.09
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A D2PAK (TO-263) Adjustable Surface Mount 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 170-3501
Mfr. Part No.MC78M24BTG
MYR1.275
Each (In a Tube of 50)
units
24 V 700mA TO-220 Fixed Through Hole - 40 V dc 3 5W -40 °C +125 °C 1 Positive -
RS Stock No. 239-2963
Mfr. Part No.BA17805T
BrandROHM
MYR6.02
Each
units
5 V 1A TO-220FP Fixed Through Hole 7.5 V 25 V 3 2W -40 °C +85 °C 1 Positive -
RS Stock No. 113-8596
Mfr. Part No.LM317TG
MYR2.40
Each (In a Tube of 50)
units
1.2 → 37 V 2.2A TO-220 Adjustable Through Hole -0.3 V 40 V 3 - -55 °C +150 °C 1 - -
RS Stock No. 806-4116
Mfr. Part No.MC78L05ACP
MYR0.876
Each (In a Pack of 50)
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 655-638
Mfr. Part No.CSR2-10E
MYR200.07
Each
units
230 V 10A - Adjustable Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 661-3772
Mfr. Part No.TPS51200DRCT
MYR3.77
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. 169-8146
Mfr. Part No.NJM7909FA
MYR2.49
Each (In a Tube of 100)
units
-9 V 1.5A TO-220F Fixed Through Hole - -35 V 3 16W -40 °C +85 °C 1 Negative -
RS Stock No. 516-6177
Mfr. Part No.MC7806CTG
MYR2.39
Each
units
6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 686-9726
Mfr. Part No.L7805ABP
MYR2.89
Each (In a Pack of 10)
units
5 V 1A TO-220FP Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 686-9735
Mfr. Part No.L7824CP
MYR2.543
Each (In a Pack of 10)
units
24 V 1.5A TO-220FP Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 102-5741
Mfr. Part No.LM78M05CDT/NOPB
MYR3.785
Each (In a Tube of 75)
units
5 V 500mA TO-252 Fixed Surface Mount 7.2 V 35 V 3 - -40 °C +125 °C 1 Positive -
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