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. 816-0282
Mfr. Part No.TL431CDBZR,215
BrandNexperia
TWD9.90
Each (In a Pack of 50)
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2.49 → 36 V 100mA SOT-23 Adjustable Surface Mount - - 3 950mW 0 °C +70 °C 1 Positive -
RS Stock No. 178-5137
Mfr. Part No.L78L10ACUTR
TWD4.70
Each (On a Reel of 2500)
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- - - - - - - - - - - - - -
RS Stock No. 922-2369
Mfr. Part No.LM7805CT/NOPB
TWD32.60
Each (In a Tube of 45)
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5 V 1A TO-220 Fixed Through Hole 7.5 V 35 V 3 - 0 °C +70 °C 1 Positive -
RS Stock No. 713-9470
Mfr. Part No.NJM7806DL1A-TE1
TWD18.40
Each (In a Pack of 5)
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6 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 647-2710
Mfr. Part No.LP3966ES-ADJ/NOPB
TWD183.00
Each
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1.2 → 5 V 3A D2PAK (TO-263) Adjustable Surface Mount 2.5 V 7 V 5 - -40 °C +125 °C 1 Positive ±1.5%
RS Stock No. 809-6333
Mfr. Part No.LM317MKVURG3
TWD19.50
Each (In a Pack of 10)
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37 V 500mA TO-252 Adjustable Surface Mount 2.5 V 40 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 536-0919
Mfr. Part No.LM317MDT/NOPB
TWD32.60
Each (In a Pack of 10)
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1.2 → 37 V 500mA TO-252 Adjustable Surface Mount 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 761-3537
Mfr. Part No.LM317LZ
TWD9.60
Each (In a Pack of 25)
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1.2 → 37 V 100mA TO-92 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 168-6598
Mfr. Part No.L7824ABV
TWD14.50
Each (In a Tube of 50)
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24 V 1A TO-220 Fixed Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 165-7754
Mfr. Part No.L78L33ACUTR
TWD4.40
Each (On a Reel of 2500)
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3.3 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 168-8870
Mfr. Part No.LM317T-DG
TWD22.20
Each (In a Tube of 50)
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1.2 → 37 V 500mA TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 166-3218
Mfr. Part No.KA79M12RTF
TWD11.20
Each (On a Reel of 2000)
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-12 V 500mA DPAK Fixed Surface Mount - -35 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 713-9461
Mfr. Part No.NJM7805DL1A-TE1
TWD18.40
Each (In a Pack of 5)
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5 V 1.5A TO-252 Fixed Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 877-2750
Mfr. Part No.LM317T-DG
TWD22.20
Each (In a Pack of 25)
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1.2 → 37 V 500mA TO-220 Adjustable Through Hole - - 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 146-2236
Mfr. Part No.TS78L05ACY RMG
TWD6.10
Each (On a Reel of 1000)
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5 V 150mA SOT-89 Fixed Surface Mount - 35 V 4 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 533-5705
Mfr. Part No.LM317EMP/NOPB
TWD78.00
Each
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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. 686-9808
Mfr. Part No.L78M05ABV
TWD16.30
Each (In a Pack of 25)
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5 V 500mA TO-220 Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 102-5737
Mfr. Part No.LM317MDT/NOPB
TWD30.70
Each (In a Tube of 75)
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1.2 → 37 V 500mA TO-252 Adjustable Surface Mount 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 880-5317
Mfr. Part No.LD39050PUR
TWD22.90
Each (In a Pack of 10)
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0.8 V 500mA DFN Adjustable Surface Mount 1.5 V 5.5 V 6 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 516-5073
Mfr. Part No.MC78LC33NTRG
TWD20.00
Each
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3.3 V 80mA TSOP Fixed Surface Mount - 12 V 5 140mW -40 °C +85 °C 1 Positive ±2.5%