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. 163-2609
Mfr. Part No.NCP4681DSQ15T1G
HK$2.39
Each (On a Reel of 3000)
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1.5 V 180mA SC-70 Fixed Surface Mount 1.4 V 5.25 V 5 - -40 °C +150 °C 1 Positive ±1%
RS Stock No. 161-2602
Mfr. Part No.NCP785AH33T1G
HK$2.983
Each (On a Reel of 2500)
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3.3 V 10.5mA SOT Fixed Surface Mount 25 V 450 V 3+Tab - - 150 °C 1 Positive ±5%
RS Stock No. 661-6724
Mfr. Part No.UA78L10ACD
HK$2.513
Each (In a Pack of 10)
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10 V 100mA SOIC Fixed Surface Mount 12.5 V 25 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 167-7454
Mfr. Part No.BA178M07FP-E2
BrandROHM
HK$3.567
Each (In a Pack of 10)
units
7 V 500mA TO-252 Fixed Surface Mount 9.5 V 22 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 686-9568
Mfr. Part No.L78L05ABZ
HK$1.539
Each (In a Pack of 50)
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5 V 100mA TO-92 Fixed Through Hole - 30 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 686-9303
Mfr. Part No.L78M05ABDT-TR
HK$3.068
Each (In a Pack of 25)
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5 V 500mA DPAK Fixed Surface Mount - 35 V 3 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 146-0321
Mfr. Part No.MIC5282YMME
BrandMicrochip
HK$10.461
Each (In a Tube of 100)
units
1.27 → 5.5 V 50mA MSOP Adjustable Surface Mount 6 V dc 120 V dc 8 - -40 °C +125 °C 1 Positive ±3%
RS Stock No. 145-5387
Mfr. Part No.KA7909TU
HK$4.26
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-9 V 1A TO-220 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±4%
RS Stock No. 714-0672
Mfr. Part No.L78L05ABD13TR
HK$1.912
Each (In a Pack of 20)
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5 V 100mA SOIC Fixed Surface Mount - 30 V 8 - -40 °C +125 °C 1 Positive -
RS Stock No. 516-4935
Mfr. Part No.MC78M15CDTG
HK$3.45
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15 V 700mA DPAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 145-7000
Mfr. Part No.UA7805CKTTR
HK$3.286
Each (On a Reel of 500)
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5 V 1.5A D2PAK (TO-263) Fixed Surface Mount 7 V 25 V 3 15W 0 °C +125 °C 1 Positive -
RS Stock No. 710-6262
Mfr. Part No.AP78L08YG-13
HK$1.649
Each (In a Pack of 20)
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8 V 100mA SOT-89 Fixed Surface Mount 10.5 V 23 V 3 - -20 °C +85 °C 1 Positive ±5%
RS Stock No. 162-8938
Mfr. Part No.MC79M05BDTRKG
HK$1.96
Each (On a Reel of 2500)
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-5 V 500mA DPAK Fixed Surface Mount - -35 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 186-9072
Mfr. Part No.LM317MBDTRKG
HK$2.271
Each (On a Reel of 2500)
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1.2 → 37 V 500mA DPAK Adjustable Surface Mount 3.1 V 40 V dc 3 + Tab - -40 °C +125 °C 1 Positive -
RS Stock No. 167-7353
Mfr. Part No.BA178M18FP-E2
BrandROHM
HK$4.092
Each (In a Pack of 10)
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18 V 500mA TO-252 Fixed Surface Mount 21 V 33 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 880-5305
Mfr. Part No.L5150BNTR
HK$7.057
Each (In a Pack of 10)
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5 V 150mA SOT-223 Fixed Surface Mount 5.6 V 40 V 3+Tab - -40 °C +150 °C 1 Positive ±2%
RS Stock No. 748-5228
Mfr. Part No.NCP502SQ37T2G
HK$4.248
Each (In a Pack of 5)
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3.6 V, 3.7 V 80mA SC-88A Fixed Surface Mount - 12 V 5 - -40 °C +85 °C 1 Positive 2%
RS Stock No. 714-7812
Mfr. Part No.PB137ACV
HK$11.626
Each (In a Pack of 5)
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13.7 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive ±1%
RS Stock No. 121-9333
Mfr. Part No.UA78M33CKVURG3
HK$2.113
Each (On a Reel of 2500)
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3.3 V 500mA TO-252 Fixed Surface Mount 5.3 V 25 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 178-2329
Mfr. Part No.NJM7809FA
HK$4.558
Each (In a Bag of 100)
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