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. 298-8520
Mfr. Part No.L7808CV
MYR1.84
Each
units
8 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6060
Mfr. Part No.L7808CV
MYR1.53
Each (In a Tube of 50)
units
8 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
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. 168-6062
Mfr. Part No.L7824CV
MYR1.53
Each (In a Tube of 50)
units
24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 170-3501
Mfr. Part No.MC78M24BTG
MYR1.95
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. 686-9603
Mfr. Part No.L78L05ACD13TR
MYR1.38
Each (In a Pack of 50)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 100-0703
Mfr. Part No.LM340T-15/NOPB
MYR4.635
Each (In a Tube of 45)
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. 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. 102-3493
Mfr. Part No.MC7824CTG
MYR2.06
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. 168-6591
Mfr. Part No.L7824CP
MYR2.63
Each (In a Tube of 50)
units
24 V 1.5A TO-220FP Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 912-9696
Mfr. Part No.ADP2108AUJZ-3.3-R7
MYR4.495
Each (On a Reel of 3000)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 661-6121
Mfr. Part No.LM317KCS
MYR3.126
Each (In a Pack of 5)
units
1.25 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 463-767
Mfr. Part No.MC7805CD2TG
MYR2.22
Each (In a Pack of 10)
units
5 V 1A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 686-9735
Mfr. Part No.L7824CP
MYR2.63
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. 178-4729
Mfr. Part No.MC78M05CTG
MYR2.09
Each (In a Tube of 50)
units
5 V 700mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 825-6804
Mfr. Part No.TPS51200DRCR
MYR3.44
Each (In a Pack of 5)
units
0.75 1.25 V 5.5A SON Adjustable Surface Mount 1.1 V 3.5 V 10 0.79W -40 °C +85 °C 1 Positive ±5%
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. 145-5387
Mfr. Part No.KA7909TU
MYR2.23
Each (In a Tube of 50)
units
-9 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 145-0649
Mfr. Part No.UA7905CKCS
MYR2.74
Each (In a Tube of 50)
units
-5 V 1.5A TO-220 Fixed Through Hole -7 V -25 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 162-8792
Mfr. Part No.TPS51200DRCR
MYR3.091
Each (On a Reel of 3000)
units
0.75 1.25 V 5.5A SON Adjustable Surface Mount 1.1 V 3.5 V 10 0.79W -40 °C +85 °C 1 Positive ±5%
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