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. 460-900
Mfr. Part No.LM338T/NOPB
HK$18.578
Each (In a Pack of 5)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 100-0719
Mfr. Part No.LM338T/NOPB
HK$15.687
Each (In a Tube of 45)
units
1.2 → 32 V 5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 761-6567
Mfr. Part No.LP2998MR/NOPB
HK$17.29
Each (In a Pack of 5)
units
- 1.5A PSOP Adjustable Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
RS Stock No. 162-6327
Mfr. Part No.LP2998MR/NOPB
HK$14.72
Each (In a Tube of 95)
units
- 1.5A PSOP Adjustable Surface Mount 2.2 V 5.5 V 8 - -40 °C +125 °C 1 - -
RS Stock No. 661-3627
Mfr. Part No.LM317DCYR
HK$5.202
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 661-6128
Mfr. Part No.LM317DCY
HK$6.08
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 121-9159
Mfr. Part No.LM317DCY
HK$5.09
Each (In a Tube of 80)
units
1.25 → 37 V 1.5A SOT-223 Adjustable Surface Mount 4.2 V 40 V 3+Tab - 0 °C +125 °C 1 Positive -
RS Stock No. 102-5754
Mfr. Part No.LM78L12ACM/NOPB
HK$5.526
Each (In a Tube of 95)
units
12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 536-1401
Mfr. Part No.LM78L12ACM/NOPB
HK$6.76
Each
units
12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 527-974
Mfr. Part No.UA78L05ACDR
HK$2.71
Each (In a Pack of 25)
units
5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 661-6709
Mfr. Part No.UA78L05ACD
HK$2.82
Each (In a Pack of 10)
units
5 V 100mA SOIC Fixed Surface Mount 7 V 20 V 8 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 810-295
Mfr. Part No.UA78L05ACLP
HK$3.85
Each
units
5 V 100mA TO-92 Fixed Through Hole 7 V 20 V 3 - 0 °C +125 °C 1 Positive ±5%
RS Stock No. 100-3967
Mfr. Part No.LM317LZ/NOPB
HK$2.53
Each (On a Reel of 1800)
units
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 533-5711
Mfr. Part No.LM317LZ/NOPB
HK$14.37
Each
units
1.2 → 37 V 100mA TO-92 Adjustable Through Hole 4.2 V 40 V 3 0.625W -40 °C +125 °C 1 Positive -
RS Stock No. 460-540
Mfr. Part No.LM79L12ACM/NOPB
HK$6.08
Each (In a Pack of 10)
units
-12 V 100mA SOIC Fixed Surface Mount -35 V -14.6 V 8 - 0 °C +70 °C 1 Negative -
RS Stock No. 533-8209
Mfr. Part No.LM317T/NOPB
HK$17.89
Each
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 660-7455
Mfr. Part No.TL783CKTTR
HK$17.466
Each (In a Pack of 5)
units
1.25 → 125 V 700mA D2PAK (TO-263) Adjustable Surface Mount 21.5 V 150 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 100-5905
Mfr. Part No.LM317T/NOPB
HK$11.074
Each (In a Tube of 45)
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 533-5698
Mfr. Part No.LM317AT/NOPB
HK$12.28
Each
units
1.2 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - -40 °C +125 °C 1 Positive ±1%
RS Stock No. 661-6812
Mfr. Part No.UA78L05ACLPR
HK$3.34
Each (In a Pack of 10)
units
5 V 100mA TO-92 Fixed Through Hole 7 V 20 V 3 - 0 °C +125 °C 1 Positive ±5%