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
TWD17.20
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. 124-6453
Mfr. Part No.BA178M05FP-E2
BrandROHM
TWD16.50
Each (In a Pack of 10)
units
5 V 500mA TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 392-1281
Mfr. Part No.BP5039A
BrandROHM
TWD179.00
Each
units
24 V 200mA SIP Fixed Through Hole - 113 → 170 V 6 - -20 °C +80 °C - - -
RS Stock No. 178-5745
Mfr. Part No.BD50C0AWFP-CE2
BrandROHM
TWD46.40
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. 124-6459
Mfr. Part No.BA78M05FP-E2
BrandROHM
TWD25.00
Each (In a Pack of 10)
units
5 V 500mA TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-5576
Mfr. Part No.BD450M5WFPJ-CZE2
BrandROHM
TWD29.30
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. 239-2963
Mfr. Part No.BA17805T
BrandROHM
TWD54.00
Each
units
5 V 1A TO-220FP Fixed Through Hole 7.5 V 25 V 3 2W -40 °C +85 °C 1 Positive -
RS Stock No. 178-5570
Mfr. Part No.BD3575YFP-ME2
BrandROHM
TWD35.20
Each (On a Reel of 2000)
units
2.8 → 12 V 500mA TO-252 Adjustable Surface Mount 4.5 V 36 V 5+Tab - -40 °C +125 °C 1 - ±2 (Precision)%
RS Stock No. 171-6878
Mfr. Part No.BD3539FVM-TR
BrandROHM
TWD40.10
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 185-0608
Mfr. Part No.BD42530EFJ-CE2
BrandROHM
TWD15.70
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. 178-0042
Mfr. Part No.BD12IA5WEFJ-E2
BrandROHM
TWD7.00
Each (On a Reel of 2500)
units
12 V 500mA HTSOP-J8 Fixed Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-5759
Mfr. Part No.BD50GA5WEFJ-E2
BrandROHM
TWD19.90
Each (In a Pack of 20)
units
5 V 500mA HTSOP Fixed Surface Mount 4.5 V 14 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 167-7292
Mfr. Part No.BA178M15FP-E2
BrandROHM
TWD26.80
Each (In a Pack of 10)
units
15 V 500mA TO-252 Fixed Surface Mount 17.5 V 30 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 178-0567
Mfr. Part No.BD00GA3WEFJ-E2
BrandROHM
TWD19.90
Each (In a Pack of 20)
units
13 V 300mA HTSOP-J8 Adjustable Surface Mount 4.5 V 14 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-5917
Mfr. Part No.BD3570YFP-ME2
BrandROHM
TWD88.40
Each (In a Pack of 5)
units
3.3 V 500mA TO-252 Fixed Surface Mount 4.5 V 36 V 3+Tab - -40 °C +125 °C 1 - ±2 (Precision)%
RS Stock No. 178-0034
Mfr. Part No.BAJ6DD0T
BrandROHM
TWD59.00
Each (In a Tube of 500)
units
16 V 230A TO220FP-3 Fixed Through Hole -0.3 V 35 V 3 - -40 °C +125 °C 1 - -
RS Stock No. 178-0035
Mfr. Part No.BD00GA3WEFJ-E2
BrandROHM
TWD8.70
Each (On a Reel of 2500)
units
13 V 300mA HTSOP-J8 Adjustable Surface Mount 4.5 V 14 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 178-0649
Mfr. Part No.BD00IC0WEFJ-E2
BrandROHM
TWD23.00
Each (In a Pack of 20)
units
4.5 V 1A HTSOP-J8 Adjustable Surface Mount 2.4 V 5.5 V 8 - -25 °C +85 °C 1 - ±1%
RS Stock No. 128-8856
Mfr. Part No.BA7810FP-E2
BrandROHM
TWD35.90
Each (In a Pack of 10)
units
10 V 1A TO-252 Fixed Surface Mount 12.5 V 25 V 3+Tab - -40 °C +85 °C 1 Positive -
RS Stock No. 171-7000
Mfr. Part No.BA78M15FP-E2
BrandROHM
TWD25.00
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -