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. 922-3520
Mfr. Part No.UA78M33CDCY
MYR1.963
Each (In a Tube of 80)
units
- - - - - - - - - - - - - -
RS Stock No. 125-0050
Mfr. Part No.MC7806CTG
MYR2.16
Each (In a Tube of 50)
units
6 V 2.2A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 661-6121
Mfr. Part No.LM317KCS
MYR2.784
Each (In a Pack of 5)
units
1.25 → 37 V 1.5A TO-220 Adjustable Through Hole 4.2 V 40 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 102-5707
Mfr. Part No.LM340S-5.0/NOPB
MYR6.14
Each (In a Tube of 45)
units
5 V 1A D2PAK (TO-263) Fixed Surface Mount 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 535-9363
Mfr. Part No.LM340S-5.0/NOPB
MYR7.05
Each (In a Pack of 5)
units
5 V 1A D2PAK (TO-263) Fixed Surface Mount 7.5 V 35 V 3 - 0 °C +125 °C 1 Positive ±2%
RS Stock No. 163-0728
Mfr. Part No.NCP699SN50T1G
MYR0.456
Each (On a Reel of 3000)
units
5 V 150mA TSOP Fixed Surface Mount 2.1 V 6 V 5 400mW -40 °C +85 °C 1 Positive 2%
RS Stock No. 922-2369
Mfr. Part No.LM7805CT/NOPB
MYR5.412
Each (In a Tube of 45)
units
5 V 1A TO-220 Fixed Through Hole 7.5 V 35 V 3 - 0 °C +70 °C 1 Positive -
RS Stock No. 655-638
Mfr. Part No.CSR2-10E
MYR203.99
Each
units
230 V 10A - Adjustable Panel Mount - 230 V 3 - 0 °C +75 °C - - -
RS Stock No. 102-1392
Mfr. Part No.MC7805CD2TG
MYR2.147
Each (In a Tube of 50)
units
5 V 1A D2PAK Fixed Surface Mount - 35 V 3 - 0 °C +125 °C 1 Positive ±4%
RS Stock No. 536-0969
Mfr. Part No.LM78M05CDT/NOPB
MYR5.425
Each (In a Pack of 10)
units
5 V 500mA TO-252 Fixed Surface Mount 7.2 V 35 V 3 - -40 °C +125 °C 1 Positive -
RS Stock No. 922-8474
Mfr. Part No.ZLDO1117G33TA
MYR0.695
Each (On a Reel of 1000)
units
3.3 V 1A SOT-223 Fixed Surface Mount 2.7 V 18 V 3+Tab - -40 °C +125 °C 1 Positive 2%
RS Stock No. 759-1809
Mfr. Part No.ADP2108AUJZ-3.3-R7
MYR7.438
Each (In a Pack of 5)
units
3.3 V 600mA TSOT Fixed Surface Mount 2.3 V 5.5 V 5 - -40 °C +125 °C 1 Positive ±2%
RS Stock No. 686-9735
Mfr. Part No.L7824CP
MYR2.537
Each (In a Pack of 10)
units
24 V 1.5A TO-220FP Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 922-3491
Mfr. Part No.LM317KCS
MYR2.28
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 121-9336
Mfr. Part No.LM317KCT
MYR1.938
Each (In a Tube of 50)
units
37 V 1.5A TO-220 Adjustable Through Hole - - 3 20W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6588
Mfr. Part No.L7805ABP
MYR2.89
Each (In a Tube of 50)
units
5 V 1A TO-220FP Fixed Through Hole - 35 V 3 - -40 °C +125 °C 1 Positive 2%
RS Stock No. 806-5204
Mfr. Part No.NCP699SN50T1G
MYR1.44
Each (In a Pack of 50)
units
5 V 150mA TSOP Fixed Surface Mount 2.1 V 6 V 5 400mW -40 °C +85 °C 1 Positive 2%
RS Stock No. 145-0649
Mfr. Part No.UA7905CKCS
MYR2.67
Each (In a Tube of 50)
units
-5 V 1.5A TO-220 Fixed Through Hole -7 V -25 V 3 - 0 °C +125 °C 1 Negative -
RS Stock No. 785-6831
Mfr. Part No.LM317LZRAG
MYR1.408
Each (In a Pack of 20)
units
1.2 → 37 V 200mA TO-92 Adjustable Through Hole 4.25 V 41.25 V 3 - 0 °C +125 °C 1 Positive -
RS Stock No. 536-1394
Mfr. Part No.LM78L05ACM/NOPB
MYR3.82
Each
units
5 V 100mA SOIC Fixed Surface Mount 6.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
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