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. 526-981
Mfr. Part No.TL431AIDBZT
SGD0.756
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
RS Stock No. 922-2524
Mfr. Part No.TL431ACDBZR
SGD0.142
Each (On a Reel of 3000)
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
RS Stock No. 661-9518
Mfr. Part No.TL431AIDBZR
SGD0.418
Each (In a Pack of 10)
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
RS Stock No. 168-4858
Mfr. Part No.TL431AIDBZT
SGD0.436
Each (On a Reel of 250)
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
RS Stock No. 809-5387
Mfr. Part No.TL431CDBVR
SGD0.246
Each (On a Tape of 10)
units
2.5 - 36V SOT-23 Adjustable ±2.0 % Surface Mount Shunt 100mA - - 36 V 5 - - 3.05 x 1.75 x 1.3mm
RS Stock No. 169-5611
Mfr. Part No.TL431CDBVT
SGD0.579
Each (On a Reel of 250)
units
2.5 - 36V TO-92AP Adjustable ±1.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 5 x 4 x 5mm
RS Stock No. 195-240
Mfr. Part No.AD780BRZ
SGD17.35
Each
units
2.5V SOIC Programmable ±0.04 % Surface Mount Series/Shunt 10mA 36 V 2.499 V, 2.999 V 2 V, 3 V 8 10 μV/V 75 μV/mA 5 x 4 x 1.5mm
RS Stock No. 761-5895
Mfr. Part No.LM385M3-2.5/NOPB
SGD1.686
Each (In a Pack of 5)
units
2.5V SOT-23 Fixed ±0.8 % Surface Mount Shunt 20mA - - 2.5 V 3 - 20 mV 2.92 x 1.4 x 0.94mm
RS Stock No. 527-306
Mfr. Part No.TL431ACDBZT
SGD0.60
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
RS Stock No. 921-6939
Mfr. Part No.LM385M3-2.5/NOPB
SGD0.707
Each (On a Reel of 1000)
units
2.5V SOT-23 Fixed ±0.8 % Surface Mount Shunt 20mA - - 2.5 V 3 - 20 mV 2.92 x 1.4 x 0.94mm
RS Stock No. 661-9556
Mfr. Part No.TL431CDBVT
SGD0.711
Each (In a Pack of 10)
units
2.5 - 36V SOT-23 Adjustable ±2.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 5 - - 2.9 x 1.6 x 1.15mm
RS Stock No. 463-509
Mfr. Part No.LM285Z-1.2G
SGD0.661
Each (In a Pack of 10)
units
1.235V TO-92 Fixed ±1.0 % Through Hole Shunt 20mA - 1.223 V 1.247 V 3 - 10 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 158-1979
Mfr. Part No.AD1582BRTZ-REEL7
SGD2.138
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±0.08 % Surface Mount Series 5mA 12 V 2.498 V 2.502 V 3 25 μV/V 3.5 mV/mA 2.9 x 1.3 x 1.02mm
RS Stock No. 155-9368
Mfr. Part No.LT1460EIS8-5#PBF
SGD5.273
Each (In a Tube of 100)
units
5V SOIC Fixed ±0.125 % Surface Mount Series 40mA 30 V 4.99 V 5 V 8 1000 ppm/V 4000 ppm/mA 5 x 3.98 x 1.49mm
RS Stock No. 864-7878
Mfr. Part No.TL431ACDR2G
SGD0.381
Each (In a Pack of 50)
units
2.5 - 36V SOIC Programmable ±1.0 % Surface Mount Shunt 100mA - 2.44 V 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 548-5456
Mfr. Part No.UPC1944T-AZ
SGD3.65
Each
units
1.26 - 24V SOT-89 Adjustable ±2.4 % Surface Mount Shunt 30mA 25 V - - 3 - - 4.5 x 2.5 x 1.5mm
RS Stock No. 779-8892
Mfr. Part No.LT1004CS8-2.5#PBF
SGD3.83
Each (In a Pack of 2)
units
2.5V SOIC Fixed ±0.8 % Surface Mount Shunt 20mA - - 2.5 V 8 - - 5.004 x 3.988 x 1.498mm
RS Stock No. 145-6994
Mfr. Part No.LM285D-1-2
SGD0.41
Each (In a Tube of 75)
units
1.235V SOIC Fixed ±1.0 % Surface Mount Shunt - - - - 8 - 30 mV 5 x 4 x 1.5mm
RS Stock No. 163-0321
Mfr. Part No.TL431ACDR2G
SGD0.209
Each (On a Reel of 2500)
units
2.5 - 36V SOIC Programmable ±1.0 % Surface Mount Shunt 100mA - 2.44 V 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 686-4765
Mfr. Part No.TS2431AILT
SGD0.40
Each (In a Pack of 25)
units
2.5 - 24V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 25 V 2.5 V 24 V 3 - - 2.9 x 1.3 x 0.95mm
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