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. 160-0690
Mfr. Part No.ADR4533ARZ
SGD6.488
Each (In a Tube of 98)
units
3.3V SOIC Fixed ±0.04 % Surface Mount Series 10mA 15 V - 3.3 V 8 10 ppm/V 120 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 122-2409
Mfr. Part No.ZR40402F25TA
SGD0.349
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±2.0 % Surface Mount Series - - - - 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 121-8839
Mfr. Part No.LM4040BIM3-2.5/NOPB
SGD0.775
Each (On a Reel of 1000)
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. 738-6358
Mfr. Part No.MCP1525-I/TO
BrandMicrochip
SGD1.07
Each (In a Pack of 5)
units
2.5V TO-92 Fixed ±1.0 % Through Hole Series 20mA 7 V - - 3 350 μV/V 1.3 mV/mA 4.71 x 3.62 x 4.62mm
RS Stock No. 527-984
Mfr. Part No.TL431AILPE3
SGD0.18
Each (In a Pack of 25)
units
2.5 - 36V TO-92 Adjustable ±1.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 404-285
Mfr. Part No.REF5050AID
SGD4.74
Each
units
5V SOIC Fixed ±0.05 % Surface Mount Series 10mA 18 V - - 8 1 ppm/V 50 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 751-5228
Mfr. Part No.ZTL431AFTA
SGD0.226
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. 159-7585
Mfr. Part No.ADR421BRZ-REEL7
SGD12.129
Each (On a Reel of 1000)
units
2.5V SOIC Fixed ±0.04 % Surface Mount Series 10mA 15 V 2.499 V 2.501 V 8 35 ppm/V 70 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 165-4708
Mfr. Part No.MCP1501-10E/SN
BrandMicrochip
SGD0.99
Each (In a Tube of 100)
units
1.02V SOIC Fixed ±0.08 % Surface Mount Series 30mA 5.5 V 1.023 V 1.025 V 8 50 ppm/V 40 (Sink) ppm/mA, 70 (Source) ppm/mA 4.9 x 3.9 x 1.5mm
RS Stock No. 121-8297
Mfr. Part No.REF5020AID
SGD4.513
Each (In a Tube of 75)
units
2.048V SOIC Fixed ±0.05 % Surface Mount Series 10mA 18 V - - 8 1 ppm/V 50 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 808-3965
Mfr. Part No.LM385D-1.2R2G
SGD0.491
Each (On a Tape of 25)
units
1.235V SOIC Fixed ±2% Surface Mount Shunt - - 1.247 V 1.223 V 8 - - 5 x 4 x 1.5mm
RS Stock No. 810-289
Mfr. Part No.TL431ILP
SGD0.86
Each
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. 535-9751
Mfr. Part No.LM431BIM3/NOPB
SGD0.956
Each (In a Pack of 5)
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 0.93mm
RS Stock No. 179-1626
Mfr. Part No.TL431CD
SGD0.364
Each (In a Tube of 75)
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
New
RS Stock No. 184-1117
Mfr. Part No.TL431AIDG
SGD0.431
Each (In a Tube of 98)
units
2.49V SOIC Adjustable - Surface Mount Series/Shunt 100mA 2.52 V - 36 V 8 - - 5 x 4 x 1.5mm
RS Stock No. 545-5562
Mfr. Part No.LT1021CCN8-10#PBF
SGD9.32
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. 921-6932
Mfr. Part No.LM4041BIM3-1.2/NOPB
SGD0.914
Each (On a Reel of 1000)
units
1.225V SOT-23 Fixed ±0.1 % Surface Mount Shunt 12mA - - 1.2 V 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 178-8930
Mfr. Part No.TL431AILP
SGD0.326
Each (On a Reel of 1000)
units
2.5 - 36V TO-92 Adjustable ±1.0 % Through Hole Shunt 100mA - - 36 V 3 - - 5.21 x 4.19 x 5.34mm
RS Stock No. 806-7824
Mfr. Part No.AD780BNZ
SGD21.42
Each
units
2.5 V, 3 V PDIP Programmable ±0.04 % Through Hole Series/Shunt 10mA 36 V 2.5 V 3 V 8 10 μV/V 75 (Shunt) μV/mA, 150 (Series) μV/mA 10.16 x 7.11 x 4.95mm
RS Stock No. 121-8848
Mfr. Part No.LM431BIM3/NOPB
SGD0.359
Each (On a Reel of 1000)
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 0.93mm
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