Voltage References

Voltage references are electronic devices that provide a fixed voltage. They provide a constant voltage regardless of external factors like the load on the device or fluctuations in the power supply.


Voltage references have different characteristics depending on their purpose. Voltage references used in laboratory applications are designed to have extremely high precision and accuracy, whereas those used as regulators for computer power supplies are much cheaper but less precise. 


Types of voltage references

There are many different kinds of voltage references, generally categorised by type, tolerance, rated voltage, reference voltage and rated current. The most common tolerances are ±2%, ±1% and ±0.5%, but voltage references are available even up to ±40%. 


What are voltage references used for? 

Voltage references can be used for a variety of different precision measurement and control systems such as power supplies in personal computers and analog-to-digital converters. They are also used in scientific applications and in medical equipment where voltage variations need to be tested regularly. 


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Description Price Nominal Voltage Package Type Reference Type Initial Accuracy Mounting Type Topology Maximum Output Current Maximum Input Voltage Minimum Output Voltage Maximum Output Voltage Pin Count Line Regulation Load Regulation Dimensions
RS Stock No. 168-6826
Mfr. Part No.TL431CDT
TWD3.80
Each (On a Reel of 2500)
units
2.5 - 36V SOIC Adjustable ±2.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.9 x 1.25mm
RS Stock No. 759-0844
Mfr. Part No.AD584JH
TWD655.00
Each
units
2.5 V, 5 V, 7.5 V, 10 V TO-99 Programmable ±0.3 % Through Hole Series 10mA 15 V - 10 V 8 0.005 %/V 50 ppm/mA 8.5 (Dia.) x 4.7mm
RS Stock No. 159-7621
Mfr. Part No.AD584JH
TWD529.60
Each (In a Box of 100)
units
2.5 V, 5 V, 7.5 V, 10 V TO-99 Programmable ±0.3 % Through Hole Series 10mA 15 V - 10 V 8 0.005 %/V 50 ppm/mA 8.5 (Dia.) x 4.7mm
RS Stock No. 166-3439
Mfr. Part No.LM431BCMX
TWD5.20
Each (On a Reel of 3000)
units
2.5 - 36V SOIC Adjustable ±1.0 % Surface Mount Shunt 100 (Cathode)mA - 2.5 (Cathode) V 36 V 8 - - 5 x 4 x 1.5mm
RS Stock No. 758-9572
Mfr. Part No.AD1583BRTZ-REEL7
TWD79.00
Each
units
3V SOT-23 Fixed ±0.1 % Surface Mount Series 5mA 5 V 2.997 V 3 V 3 25 μV/V 3.7 mV/mA 3.04 x 1.4 x 1.02mm
RS Stock No. 751-5228
Mfr. Part No.ZTL431AFTA
TWD9.90
Each (In a Pack of 50)
units
2.5V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 20 V 2.475 V 20 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 284-214
Mfr. Part No.TLE2425CLP
TWD89.00
Each
units
2.5V TO-92 Fixed - Through Hole Series 80mA 40 V 2.47 V 2.53 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 162-4377
Mfr. Part No.TLE2425CLP
TWD40.90
Each (In a Bag of 1000)
units
2.5V TO-92 Fixed - Through Hole Series 80mA 40 V 2.47 V 2.53 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 166-0327
Mfr. Part No.TL431AW5-7
TWD2.70
Each (On a Reel of 3000)
units
2.5 - 36V SOT-25 Adjustable ±1.0 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 5 - - 3.1 x 1.7 x 1.3mm
RS Stock No. 162-4864
Mfr. Part No.TL431ACD
TWD11.10
Each (In a Tube of 75)
units
2.5 - 36V SOIC Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.91 x 1.58mm
RS Stock No. 545-5562
Mfr. Part No.LT1021CCN8-10#PBF
TWD304.00
Each
units
10V PDIP Fixed ±0.05 % Through Hole Series/Shunt 10mA 40 V 9.995 V 10.005 V 8 4 ppm/V 100 ppm/mA 10.16 x 6.48 x 3.3mm
RS Stock No. 535-9559
Mfr. Part No.LM4040BIM3-2.5/NOPB
TWD45.60
Each (In a Pack of 5)
units
2.5V SOT-23 Fixed ±0.2 % Surface Mount Shunt 15mA - - - 3 - 6 mV 2.92 x 1.3 x 0.93mm
RS Stock No. 121-8559
Mfr. Part No.REF3020AIDBZT
TWD36.30
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 528-426
Mfr. Part No.TL431IPK
TWD9.40
Each (In a Pack of 25)
units
2.5 - 36V SOT-89 Adjustable ±2.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.5 x 2.5 x 1.5mm
RS Stock No. 153-3347
Mfr. Part No.LTC6652AHMS8-3.3#PBF
TWD193.20
Each (In a Tube of 50)
units
3.3V MSOP Fixed ±0.05 % Surface Mount Series 5mA 13.2 V - - 8 50 ppm/V 150 ppm/mA 3 x 3 x 0.86mm
RS Stock No. 661-9827
Mfr. Part No.TL431CLPR
TWD9.40
Each (In a Pack of 10)
units
2.5 - 36V TO-92 Adjustable ±2.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 857-979
Mfr. Part No.TL431CD
TWD13.00
Each
units
2.5 - 36V SOIC Adjustable ±2.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.91 x 1.58mm
RS Stock No. 154-7679
Mfr. Part No.LT1021DCN8-10#PBF
TWD152.60
Each (In a Tube of 50)
units
10V PDIP Fixed ±1.0 % Through Hole Series 10mA 40 V 9.95 V 10.05 V 8 6 ppm/V 40 ppm/mA 10.16 x 6.477 x 3.302mm
RS Stock No. 738-5342
Mfr. Part No.TL431BSA-7
TWD10.90
Each (In a Pack of 25)
units
2.5 - 36V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 3 - - 3 x 1.4 x 1mm
RS Stock No. 527-306
Mfr. Part No.TL431ACDBZT
TWD21.00
Each (In a Pack of 25)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 3 - - 2.92 x 1.3 x 1mm