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. 163-2657
Mfr. Part No.NCV4274ADS85R4G
HK$10.779
Each (On a Reel of 800)
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8.5 V 400mA D2PAK Fixed Surface Mount 9 V 40 V 3 - -40 °C +150 °C 1 Positive 2%
RS Stock No. 181-3675
Mfr. Part No.RTKA2108502H00000BU
HK$1,422.33
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- - - - - - - - - - - - - -
RS Stock No. 825-6804
Mfr. Part No.TPS51200DRCR
HK$7.19
Each (In a Pack of 5)
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0.75 → 1.25 V 5.5A SON Adjustable Surface Mount 1.1 V 3.5 V 10 0.79W -40 °C +85 °C 1 Positive ±5%
RS Stock No. 165-7697
Mfr. Part No.L79L12ACZ-TR
HK$0.961
Each (On a Reel of 2000)
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-12 V 100mA TO-92 Fixed Through Hole - -35 V 3 - 0 °C +125 °C 1 Negative ±5%
RS Stock No. 184-4303
Mfr. Part No.MC79M08BDTG
HK$4.30
Each (In a Tube of 75)
units
-8 V 500mA DPAK Fixed Surface Mount -9.1 V -35 V 3 - -40 °C +125 °C 1 Negative -
RS Stock No. 122-1246
Mfr. Part No.ZLDO1117GTA
HK$1.61
Each (On a Reel of 1000)
units
1.2 → 5 V 1A SOT-223 Adjustable Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 686-9234
Mfr. Part No.LD1086D2T18TR
HK$7.53
Each (In a Pack of 5)
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1.8 V 1.5A D2PAK Fixed Surface Mount - 30 V 3 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 710-6278
Mfr. Part No.AP78L12YG-13
HK$1.435
Each (In a Pack of 20)
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12 V 100mA SOT-89 Fixed Surface Mount 14.5 V 27 V 3 - -20 °C +85 °C 1 Positive ±5%
RS Stock No. 178-5150
Mfr. Part No.L78L09ABZ
HK$0.83
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- - - - - - - - - - - - - -
RS Stock No. 686-9432
Mfr. Part No.L78L10ACUTR
HK$3.29
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10 V 100mA SOT-89 Fixed Surface Mount - - 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 751-5192
Mfr. Part No.ZLDO1117K33TC
HK$4.02
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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. 145-3439
Mfr. Part No.MC7806ACTG
HK$4.00
Each (In a Tube of 50)
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6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 912-9624
Mfr. Part No.ADP151AUJZ-3.3-R7
HK$4.275
Each (On a Reel of 3000)
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3.3 V 200mA TSOT Fixed Surface Mount 2.2 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2.5%
RS Stock No. 166-0463
Mfr. Part No.AP7313-18SRG-7
HK$0.907
Each (On a Reel of 3000)
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1.8 V 150mA SOT-23R Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
New
RS Stock No. 192-4615
Mfr. Part No.LDBL20D-25R
HK$2.928
Each (On a Reel of 15000)
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2.5 V 200mA STSTAMP Fixed Surface Mount 1.5 V 5.5 V 4 - -40 °C +125 °C 1 - ±3%
RS Stock No. 714-0795
Mfr. Part No.LM317LD13TR
HK$3.265
Each (In a Pack of 10)
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1.2 → 37 V 200mA SOIC Adjustable Surface Mount - - 8 - 0 °C +125 °C 1 Positive -
RS Stock No. 122-0823
Mfr. Part No.AP7333-18SAG-7
HK$0.958
Each (On a Reel of 3000)
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1.8 V 300mA SOT-23 Fixed Surface Mount 2 V 6 V 3 - -40 °C +85 °C 1 Positive ±2%
RS Stock No. 169-8952
Mfr. Part No.TS78L05CS RLG
HK$1.77
Each (On a Reel of 2500)
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5 V 150mA SOP Fixed Surface Mount - 35 V 8 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 192-4800
Mfr. Part No.LD56050DPU120R
HK$4.092
Each (In a Pack of 25)
units
1.2 V 500mA DFN Fixed Surface Mount 0.8 V 5.5 V 4 - -40 °C +85 °C 1 - ±1.5%
RS Stock No. 162-9420
Mfr. Part No.MC78M09CDTRKG
HK$1.185
Each (On a Reel of 2500)
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9 V 700mA DPAK Fixed Surface Mount - 40 V dc 3 5W 0 °C +125 °C 1 Positive -
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