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. 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. 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. 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. 145-2875
Mfr. Part No.MC78M20CTG
MYR0.987
Each (In a Tube of 50)
units
20 V 700mA TO-220 Fixed Through Hole - 40 V dc 3 5W 0 °C +125 °C 1 Positive -
RS Stock No. 145-9425
Mfr. Part No.L78L05ACD13TR
MYR0.478
Each (On a Reel of 2500)
units
5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - 0 °C +150 °C 1 Positive ±5%
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. 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%
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. 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. 922-8474
Mfr. Part No.ZLDO1117G33TA
MYR0.769
Each (On a Reel of 1000)
units
3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 806-5204
Mfr. Part No.NCP699SN50T1G
MYR0.726
Each (In a Pack of 50)
units
5 V 150mA TSOP Fixed Surface Mount 2.1 V 6 V 5 400mW -40 °C +85 °C 1 Positive 2%
RS Stock No. 168-6797
Mfr. Part No.L7809CV
MYR1.499
Each (In a Tube of 50)
units
9 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
RS Stock No. 121-9336
Mfr. Part No.LM317KCT
MYR1.13
Each (In a Tube of 50)
units
37 V 1.5A TO-220 Adjustable Through Hole - - 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 163-0728
Mfr. Part No.NCP699SN50T1G
MYR0.507
Each (On a Reel of 3000)
units
5 V 150mA TSOP Fixed Surface Mount 2.1 V 6 V 5 400mW -40 °C +85 °C 1 Positive 2%
RS Stock No. 714-0666
Mfr. Part No.L7809CV
MYR1.53
Each (In a Pack of 10)
units
9 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive 2%
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. 168-6588
Mfr. Part No.L7805ABP
MYR2.404
Each (In a Tube of 50)
units
5 V 1A TO-220FP Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 102-5707
Mfr. Part No.LM340S-5.0/NOPB
MYR5.443
Each (In a Tube of 45)
units
5 V 1A D2PAK (TO-263) Fixed Surface Mount 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
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. 169-0663
Mfr. Part No.AP7333-15SAG-7
MYR0.458
Each (On a Reel of 3000)
units
1.5 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
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