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. 122-0328
Mfr. Part No.TL431BSA-7
R 1.361
Each (On a Reel of 3000)
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. 738-5342
Mfr. Part No.TL431BSA-7
R 2.168
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. 121-9495
Mfr. Part No.TL431ASA-7
R 1.116
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 3 - - 3 x 1.4 x 1mm
RS stock no. 738-5333
Mfr. Part No.TL431ASA-7
R 4.439
Each (In a Pack of 50)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 3 - - 3 x 1.4 x 1mm
RS stock no. 921-0657
Mfr. Part No.AS431BNTR-G1
R 1.553
Each (In a Pack of 100)
units
2.5V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 36 V 2.5 V 36 V 3 - - 3 x 1.4 x 1.1mm
RS stock no. 146-0949
Mfr. Part No.AS431BNTR-G1
R 0.83
Each (On a Reel of 3000)
units
2.5V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 36 V 2.5 V 36 V 3 - - 3 x 1.4 x 1.1mm
RS stock no. 921-0543
Mfr. Part No.AP4310AMTR-G1
R 1.453
Each (In a Pack of 50)
units
2.5V SOIC Fixed ±0.4 % Surface Mount Shunt 80mA 36 V - - 8 - - 5.1 x 4 x 1.45mm
RS stock no. 165-8339
Mfr. Part No.AP4310AMTR-G1
R 1.397
Each (On a Reel of 4000)
units
2.5V SOIC Fixed ±0.4 % Surface Mount Shunt 80mA 36 V - - 8 - - 5.1 x 4 x 1.45mm
RS stock no. 165-8409
Mfr. Part No.LM4040C30FTA
R 2.178
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±0.5 % Surface Mount Shunt 15mA - - - 3 - - 3.04 x 1.4 x 1.02mm
RS stock no. 122-0333
Mfr. Part No.TLV431BFTA
R 2.314
Each (On a Reel of 3000)
units
1.24 - 18V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 20mA 20 V 1.24 V 18 V 3 - - 3.04 x 1.4 x 1.02mm
RS stock no. 921-0726
Mfr. Part No.LM4040C30FTA
R 6.336
Each (In a Pack of 20)
units
2.5V SOT-23 Fixed ±0.5 % Surface Mount Shunt 15mA - - - 3 - - 3.04 x 1.4 x 1.02mm
RS stock no. 738-5361
Mfr. Part No.TLV431BFTA
R 5.756
Each (In a Pack of 25)
units
1.24 - 18V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 20mA 20 V 1.24 V 18 V 3 - - 3.04 x 1.4 x 1.02mm
RS stock no. 738-5080
Mfr. Part No.ZR40401F41TA
R 11.585
Each (In a Pack of 10)
units
4.096V SOT-23 Fixed ±1.0 % Surface Mount Shunt 20mA - 4.05 V 4.14 V 3 - - 3.04 x 1.4 x 1.02mm
RS stock no. 121-9572
Mfr. Part No.ZTL431AFTA
R 1.237
Each (On a Reel of 3000)
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. 751-5228
Mfr. Part No.ZTL431AFTA
R 4.122
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. 922-8169
Mfr. Part No.ZR431F005TA
R 5.751
Each (On a Reel of 3000)
units
2.5V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 20 V 2.5 V 20 V 3 - - 3 x 1.4 x 1.1mm
RS stock no. 738-5099
Mfr. Part No.ZR431F005TA
R 12.608
Each (In a Pack of 5)
units
2.5V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 20 V 2.5 V 20 V 3 - - 3 x 1.4 x 1.1mm
RS stock no. 751-4483
Mfr. Part No.LM4040D50FTA
R 6.296
Each (On a Tape of 25)
units
5V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - 5 V 3 - 10 mV 3.04 x 1.4 x 1.02mm
RS stock no. 751-4474
Mfr. Part No.LM4040D25FTA
R 6.296
Each (In a Pack of 25)
units
2.5V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - 2.5 V 3 - 10 mV 3.04 x 1.4 x 1.02mm
RS stock no. 921-0710
Mfr. Part No.AZ431LBNTR-G1
R 3.901
Each (In a Pack of 50)
units
1.24V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 18 V 1.24 V 18 V 3 - - 3 x 1.4 x 1.1mm