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. 751-5192
Mfr. Part No.ZLDO1117K33TC
MYR1.92
Each (In a Pack of 25)
units
3.3 V 1A TO-252 Fixed Surface Mount 2.7 V 18 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 533-5705
Mfr. Part No.LM317EMP/NOPB
MYR2.43
Each
units
1.2 → 37 V 1A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 714-7783
Mfr. Part No.L78S12CV
MYR2.45
Each (In a Pack of 10)
units
12 V 2A TO-220 Fixed Through Hole 15 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 298-8615
Mfr. Part No.L7905CV
MYR2.33
Each
units
-5 V 1.5A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +150 °C 1 Negative -
RS Stock No. 884-2552
Mfr. Part No.LT1033CT#PBF
MYR25.035
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. 125-0053
Mfr. Part No.MC7824ACTG
MYR1.695
Each (In a Tube of 50)
units
24 V 1A TO-220 Fixed Through Hole - 40 V dc 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 296-778
Mfr. Part No.L7812CP
MYR2.21
Each
units
12 V 1.5A TO-220FP Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 189-1295
Mfr. Part No.L78L05ACZ
MYR1.31
Each
units
5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 681-0418
Mfr. Part No.KA317TU
MYR3.12
Each (In a Pack of 5)
units
1.2 → 37 V 2.2A TO-220 Adjustable Through Hole - 40 V 3 - 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. 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. 178-5063
Mfr. Part No.LM317D2T-TR
MYR1.545
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
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. 756-3930
Mfr. Part No.TA78M05F(TE16L1,NQ
BrandToshiba
MYR2.492
Each (In a Pack of 5)
units
5.25 V 500mA HSOP Fixed Surface Mount 10 V 35 V 3 - -30 °C +150 °C 1 Positive ±4%
RS Stock No. 168-6062
Mfr. Part No.L7824CV
MYR1.004
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. 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. 785-7080
Mfr. Part No.MC78M20CTG
MYR1.367
Each (In a Pack of 10)
units
20 V 700mA TO-220 Fixed Through Hole - 40 V dc 3 5W 0 °C +125 °C 1 Positive -
RS Stock No. 298-8564
Mfr. Part No.L7824CV
MYR1.75
Each
units
24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9603
Mfr. Part No.L78L05ACD13TR
MYR1.064
Each (In a Pack of 50)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - 0 °C +150 °C 1 Positive ±5%
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