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. 889-5796
Mfr. Part No.LR8N8-G
BrandMicrochip
kr 4,32
Each (On a Reel of 2000)
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1.2 → 440 V 30mA Adjustable SOT-89 Surface Mount 13.2 V 450 V 3 - -40 °C +85 °C 1 Positive ±5%
RS Stock No. 124-5365
Mfr. Part No.NCP553SQ30T1G
kr 1,335
Each (On a Reel of 3000)
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3 V 80mA Fixed SC-82AB Surface Mount - 12 V 4 - -40 °C +85 °C 1 - 2%
RS Stock No. 713-9540
Mfr. Part No.NJM78M08DL1A-TE1
kr 3,456
Each (In a Pack of 5)
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8 V 500mA Fixed TO-252 Surface Mount - 35 V 3 1W -40 °C +85 °C 1 Positive -
RS Stock No. 748-5256
Mfr. Part No.NCP512SQ30T2G
kr 1,738
Each (On a Tape of 5)
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3 V 200mA Fixed SC-88A Surface Mount 0 V 6 V 5 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 178-5053
Mfr. Part No.L7806CD2T-TR
kr 1,412
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- - - - - - - - - - - - - -
RS Stock No. 141-3550
Mfr. Part No.NCV8114ASN180T1G
kr 0,473
Each (In a Pack of 50)
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1.8 V 600mA Fixed TSOP Surface Mount 1.7 V 5.5 V 5 - -40 °C +125 °C 1 Positive -2 → +3%
RS Stock No. 159-9544
Mfr. Part No.ADM7151ARDZ-04
kr 60,842
Each (In a Tube of 98)
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1.5 → 5.1 V 800mA Adjustable SOIC Surface Mount 4.5 V 16 V 8 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 191-7009
Mfr. Part No.MAX1792EUA33+
kr 29,092
Each (In a Pack of 5)
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3.3 V, 1.25 → 5 V 500mA Adjustable, Fixed μMax Surface Mount 2.5 V 5.5 V 8 1.3W -40 °C +85 °C 1 - ±1%
RS Stock No. 732-1206
Mfr. Part No.UA78L08ACLPRE3
kr 4,208
Each (In a Pack of 5)
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8 V 100mA Fixed TO-92 Through Hole 10.5 V 23 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 686-9773
Mfr. Part No.L7824ABV
kr 3,908
Each (In a Pack of 10)
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24 V 1A Fixed TO-220 Through Hole - 40 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 178-7404
Mfr. Part No.TLE4285GHTSA1
BrandInfineon
kr 3,869
Each (On a Reel of 3000)
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5 V 15mA Fixed SCT-595 Surface Mount 6 V 45 V 5 - -40 °C +150 °C 1 Positive 4%
RS Stock No. 516-5988
Mfr. Part No.MC7805ABD2TG
kr 7,438
Each (In a Pack of 5)
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5 V 2.2A Fixed D2PAK Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±4%
RS Stock No. 178-2334
Mfr. Part No.NJM7824FA
kr 7,471
Each (In a Bag of 100)
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- - - - - - - - - - - - - -
RS Stock No. 178-2332
Mfr. Part No.NJM79M09FA
kr 7,543
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-9 V 500mA Fixed TO-220F Through Hole - -35 V 3 7.5W -40 °C +85 °C 1 Negative -
RS Stock No. 178-5859
Mfr. Part No.BD9E151NUX-TR
BrandROHM
kr 6,132
Each (In a Pack of 10)
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1 → 19.6 V 1.2A Adjustable VSON Surface Mount 6 V 28 V 8 - -40 °C +85 °C 1 - ±1 (Precision)%
RS Stock No. 2508962653
Mfr. Part No.NTE935
kr 150,12
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RS Stock No. 2508962293
Mfr. Part No.NTE1914
kr 77,64
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