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. 536-1394
Mfr. Part No.LM78L05ACM/NOPB
£2.01
Each
Units
5 V 100mA Fixed SOIC Surface Mount 6.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 751-2890
Mfr. Part No.AP1117E33G-13
£0.263
Each (In a Pack of 50)
Units
3.3 V 1A Fixed SOT-223 Surface Mount 6.4 V 18 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 102-5753
Mfr. Part No.LM78L05ACM/NOPB
£0.529
Each (In a Tube of 95)
Units
5 V 100mA Fixed SOIC Surface Mount 6.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 168-6536
Mfr. Part No.L78S75CV
£0.552
Each (In a Tube of 50)
Units
7.5 V 2A Fixed TO-220 Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9026
Mfr. Part No.L78S75CV
£0.607
Each (In a Pack of 10)
Units
7.5 V 2A Fixed TO-220 Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
£0.388
Each (In a Pack of 10)
Units
5 V 1A Fixed TO-252 Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 829-3266
Mfr. Part No.LR8N3-G
BrandMicrochip
£0.419
Each (In a Pack of 10)
Units
1.2 440 V 30mA Adjustable TO-92 Through Hole 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 170-4344
Mfr. Part No.LR8N3-G
BrandMicrochip
£0.373
Each (In a Bag of 1000)
Units
- - - - - - - - - - - - - -
RS Stock No. 661-3627
Mfr. Part No.LM317DCYR
£0.624
Each (In a Pack of 5)
Units
1.25 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 661-6128
Mfr. Part No.LM317DCY
£0.716
Each (In a Pack of 5)
Units
1.25 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 121-9159
Mfr. Part No.LM317DCY
£0.459
Each (In a Tube of 80)
Units
1.25 37 V 1.5A Adjustable SOT-223 Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 806-4068
Mfr. Part No.LM78L05ACZXA
£0.165
Each (In a Pack of 50)
Units
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 761-5680
Mfr. Part No.LM340MP-5.0/NOPB
£1.098
Each (In a Pack of 5)
Units
5 V 1A Fixed SOT-223 Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 921-6910
Mfr. Part No.LM340MP-5.0/NOPB
£0.48
Each (On a Reel of 1000)
Units
5 V 1A Fixed SOT-223 Surface Mount 7.5 V 35 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 686-9751
Mfr. Part No.L78S09CV
£0.502
Each (In a Pack of 10)
Units
9 V 2A Fixed TO-220 Through Hole 12 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 145-8603
Mfr. Part No.L78S09CV
£0.456
Each (In a Tube of 50)
Units
9 V 2A Fixed TO-220 Through Hole 12 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 661-6730
Mfr. Part No.UA78M05IDCY
£0.50
Each (In a Pack of 5)
Units
5 V 500mA Fixed SOT-223 Surface Mount 7 V 25 V 3+Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 169-8719
Mfr. Part No.LM78L05ACZXA
£0.073
Each (On a Tape of 2000)
Units
5 V 100mA Fixed TO-92 Through Hole - 30 V 3 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 102-3489
Mfr. Part No.MC7808CTG
£0.342
Each (In a Tube of 50)
Units
8 V 2.2A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 102-3491
Mfr. Part No.MC7812CTG
£0.388
Each (In a Tube of 50)
Units
12 V 1A Fixed TO-220 Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
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STMicroelectronics L78 Series of fixed output voltage regulators ...
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STMicroelectronics L78 Series of fixed output voltage regulators are useful in a wide range of applications within the electronics Industry. The three terminal positive linear voltage regulators can remove problems that are related with single point regulation by providing local on-card regulation. The ST Regulator IC can deliver up to ...