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. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
HK$5.654
Each (In a Pack of 10)
units
5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-5575
Mfr. Part No.BD450M5FP2-CZE2
BrandROHM
HK$7.173
Each (On a Reel of 500)
units
5 V 500mA TO-263 Fixed Surface Mount 3 V 42 V 3+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 178-5617
Mfr. Part No.BD9E151NUX-TR
BrandROHM
HK$3.141
Each (On a Reel of 4000)
units
1 → 19.6 V 1.2A VSON Adjustable Surface Mount 6 V 28 V 8 - -40 °C +85 °C 1 - ±1 (Precision)%
RS Stock No. 178-0590
Mfr. Part No.BA78M10FP-E2
BrandROHM
HK$4.403
Each (In a Pack of 10)
units
10 V 500mA TO252-3 Fixed Through Hole 12.5 V 25 V 3 - -40 °C +85 °C 1 - -
RS Stock No. 178-5816
Mfr. Part No.BD450M5WFPJ-CZE2
BrandROHM
HK$9.559
Each (In a Pack of 10)
units
5 V 500mA TO-252 Fixed Surface Mount 3 V 42 V 5+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 178-5626
Mfr. Part No.BH25PB1WHFV-TR
BrandROHM
HK$2.10
Each (On a Reel of 3000)
units
2.5 V 150mA HVSOF Fixed Surface Mount 1.7 V 5.5 V 5 - -40 °C +85 °C 1 - ±1%
RS Stock No. 167-7413
Mfr. Part No.BA178M24FP-E2
BrandROHM
HK$4.297
Each (In a Pack of 10)
units
24 V 500mA TO-252 Fixed Surface Mount 27 V 33 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-5576
Mfr. Part No.BD450M5WFPJ-CZE2
BrandROHM
HK$6.38
Each (On a Reel of 2000)
units
5 V 500mA TO-252 Fixed Surface Mount 3 V 42 V 5+Tab - -40 °C +150 °C 1 - ±2%
RS Stock No. 178-5745
Mfr. Part No.BD50C0AWFP-CE2
BrandROHM
HK$10.546
Each (In a Pack of 5)
units
5 V 1A TO-252 Fixed Surface Mount 4 V 26.5 V 5+Tab - -40 °C +125 °C 1 - ±1%
RS Stock No. 185-0608
Mfr. Part No.BD42530EFJ-CE2
BrandROHM
HK$5.949
Each (On a Reel of 2500)
units
- 250mA HTSOP - Surface Mount 5.6 V 42 V 8 - -40 °C +150 °C 1 - ±10mV
RS Stock No. 178-0598
Mfr. Part No.BD25IA5WEFJ-E2
BrandROHM
HK$2.341
Each (In a Pack of 20)
units
25 V 500mA HTSOP-J8 Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 167-7353
Mfr. Part No.BA178M18FP-E2
BrandROHM
HK$4.092
Each (In a Pack of 10)
units
18 V 500mA TO-252 Fixed Surface Mount 21 V 33 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-5612
Mfr. Part No.BD90640EFJ-CE2
BrandROHM
HK$16.742
Each (On a Reel of 2500)
units
0.8 → 36 V 4A HTSOP Adjustable Surface Mount 3.5 V 36 V 8 - -40 °C +125 °C 1 - ±2%
RS Stock No. 167-7463
Mfr. Part No.BH33MA3WHFV
BrandROHM
HK$4.613
Each (In a Pack of 20)
units
3.3 V 300mA HVSOF Fixed Surface Mount 2.5 V 5.5 V 6 - -40 °C +85 °C 1 Positive ±1%
RS Stock No. 128-8855
Mfr. Part No.BA7809FP-E2
BrandROHM
HK$5.654
Each (In a Pack of 10)
units
9 V 1A TO-252 Fixed Surface Mount 11.5 V 26 V 3+Tab - -40 °C +85 °C 1 Positive -
RS Stock No. 171-7004
Mfr. Part No.BD3539FVM-TR
BrandROHM
HK$8.176
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 171-6932
Mfr. Part No.BA7809CP-E2
BrandROHM
HK$5.462
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 178-5776
Mfr. Part No.BD50HC5WEFJ-E2
BrandROHM
HK$3.80
Each (In a Pack of 20)
units
5 V 1.5A HTSOP Fixed Surface Mount 4.5 V 8 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-5819
Mfr. Part No.BD33IA5WEFJ-E2
BrandROHM
HK$2.341
Each (In a Pack of 20)
units
3.3 V 500mA HTSOP Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-5750
Mfr. Part No.BD9S400MUF-CE2
BrandROHM
HK$14.662
Each (In a Pack of 5)
units
0.8 → 4.4 V 4A VQFN Adjustable Surface Mount 2.7 V 5.5 V 16 - -40 °C +125 °C 1 - -