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. 921-0546
Mfr. Part No.AP431IAZTR-G1
TWD11.10
Each (In a Pack of 50)
units
2.5V TO-92 Adjustable ±0.5 % Through Hole Shunt 100mA 36 V 2.5 V 36 V 3 - - 4.8 x 3.8 x 4.7mm
RS Stock No. 170-9003
Mfr. Part No.AP431IAZTR-G1
TWD2.80
Each (On a Tape of 2000)
units
2.5V TO-92 Adjustable ±0.5 % Through Hole Shunt 100mA 36 V 2.5 V 36 V 3 - - 4.8 x 3.8 x 4.7mm
RS Stock No. 738-5345
Mfr. Part No.TL431AW5-7
TWD9.20
Each (On a Tape of 50)
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. 751-4474
Mfr. Part No.LM4040D25FTA
TWD15.20
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. 122-0258
Mfr. Part No.LM4040D25FTA
TWD6.10
Each (On a Reel of 3000)
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. 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. 121-9572
Mfr. Part No.ZTL431AFTA
TWD3.00
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
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. 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. 122-0333
Mfr. Part No.TLV431BFTA
TWD5.60
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. 738-5361
Mfr. Part No.TLV431BFTA
TWD13.90
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. 122-0328
Mfr. Part No.TL431BSA-7
TWD3.30
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. 885-5656
Mfr. Part No.ZRB500F01TA
TWD34.20
Each (In a Pack of 10)
units
5V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA 5 V - 5 V 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 122-3398
Mfr. Part No.ZRB500F01TA
TWD18.30
Each (On a Reel of 3000)
units
5V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA 5 V - 5 V 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 738-5358
Mfr. Part No.TL432ASA-7
TWD10.70
Each (On a Tape 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. 751-5215
Mfr. Part No.ZR40402F50TA
TWD22.30
Each (In a Pack of 10)
units
5V SOT-23 Fixed ±2.0 % Surface Mount Shunt 15mA - - 5 V 3 - - 3.05 x 1.4 x 1mm
RS Stock No. 922-8522
Mfr. Part No.ZXRE4041DFTA
TWD15.00
Each (On a Reel of 3000)
units
1.225V SOT-23 Fixed ±1.0 % Surface Mount Shunt 12mA - 1.213 V 1.237 V 3 - 10 mV 3.04 x 1.4 x 1.02mm
RS Stock No. 921-0720
Mfr. Part No.LM4040D30FTA
TWD15.20
Each (In a Pack of 20)
units
3V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - - 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 922-8513
Mfr. Part No.ZXRE125EFTA
TWD17.80
Each (On a Reel of 3000)
units
1.22V SOT-23 Fixed ±0.5 % Surface Mount Shunt 20mA - 1.196 V 1.244 V 3 - 10 mV 3.04 x 1.4 x 1.02mm
RS Stock No. 122-1432
Mfr. Part No.ZXRE125CFTA
TWD32.50
Each (On a Reel of 3000)
units
1.22V SOT-23 Fixed ±0.5 % Surface Mount Shunt 20mA - 1.214 V 1.226 V 3 - - 3.04 x 1.4 x 1.02mm