Voltage References

Voltage references are electronic devices that provide a fixed output voltage. They provide a constant voltage regardless of external factors. This includes the load on the device, temperature or fluctuations in the power supply. Learn more in our Complete Guide to Voltage References.

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.

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%.

Voltage reference ICs come in a standard semiconductor package, such as PDIP, SO, SOIC and SOT-23. The pin count may also be combined with the package type, for example SO-8.

Types of voltage references

  • Two-terminal shunt voltage reference
  • Three-terminal series voltage reference
  • Band-gap voltage reference
  • Low noise voltage reference
  • Micropower voltage reference

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 analogue-to-digital converters. They are also used in scientific applications and in medical equipment where voltage variations need to be tested regularly. Voltage references are also used in battery-powered devices.


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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. 122-2414
Mfr. Part No.ZTLV431AFTA
kr 1,801
Each (On a Reel of 3000)
Units
1.24V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 15mA - 1.24 V 10 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 121-9938
Mfr. Part No.ZRC250F02TA
kr 3,997
Each (On a Reel of 3000)
Units
2.5V SOT-23 Fixed ±2.0 % Surface Mount Shunt 5mA - 2.45 V 2.55 V 3 - - 3.05 x 1.4 x 1mm
RS Stock No. 122-0258
Mfr. Part No.LM4040D25FTA
kr 1,489
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. 206-0267
Mfr. Part No.LM4040B33QFTA
kr 9,784
Each (In a Pack of 25)
Units
3.3V SOT-23 Precision 0.2% Surface Mount Shunt - - - - 3 - - -
RS Stock No. 121-9572
Mfr. Part No.ZTL431AFTA
kr 0,772
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. 738-5115
Mfr. Part No.ZRC400F01TA
kr 10,98
Each (In a Pack of 5)
Units
4.096V SOT-23 Fixed ±1.0 % Surface Mount Shunt 5mA - 4.06 V 4.14 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 921-0546
Mfr. Part No.AP431IAZTR-G1
kr 0,772
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. 121-9503
Mfr. Part No.AP432ASAG-7
kr 2,521
Each (On a Reel of 3000)
Units
1.24 - 20V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 200mA 20 V 1.24 V 20 V 3 - - 3 x 1.4 x 1mm
RS Stock No. 751-4474
Mfr. Part No.LM4040D25FTA
kr 3,605
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. 751-5394
Mfr. Part No.ZXRE125EFTA
kr 10,372
Each (In a Pack of 5)
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. 738-5358
Mfr. Part No.TL432ASA-7
kr 2,74
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. 738-5349
Mfr. Part No.TL431BW5-7
kr 0,624
Each (In a Pack of 25)
Units
2.5 - 36V SOT-25 Adjustable ±0.5 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 5 - - 3.1 x 1.7 x 1.3mm
RS Stock No. 823-1817
Mfr. Part No.ZTLV431AFTA
kr 1,859
Each (In a Pack of 20)
Units
1.24V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 15mA - 1.24 V 10 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 921-0657
Mfr. Part No.AS431BNTR-G1
kr 0,989
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. 154-891
Mfr. Part No.ZR431FTA
kr 4,381
Each (In a Pack of 10)
Units
2.5 - 20V SOT-23 Adjustable ±2.0 % Surface Mount Shunt 100mA 20 V 2.5 V 20 V 3 - - 2.9 x 1.3 x 1mm
RS Stock No. 121-9495
Mfr. Part No.TL431ASA-7
kr 0,382
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. 823-1794
Mfr. Part No.ZHT431F02TA
kr 3,696
Each (In a Pack of 10)
Units
2.5V SOT-23 Adjustable ±2.0 % Surface Mount Shunt 100mA 20 V - 20 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 885-5647
Mfr. Part No.ZR404005F25TA
kr 4,884
Each (In a Pack of 5)
Units
2.5V SOT-23 Fixed ±0.5 % Surface Mount Shunt 15mA 2.5 V - 2.5 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 206-0273
Mfr. Part No.LM4040C41QFTA
kr 6,105
Each (In a Pack of 25)
Units
4.096V SOT-23 Precision 0.5% Surface Mount Shunt - - - - 3 - - -
RS Stock No. 823-1808
Mfr. Part No.ZR40401F50TA
kr 7,36
Each (In a Pack of 10)
Units
5V SOT-23 Fixed ±1.0 % Surface Mount Series - - - - 3 - - 3.04 x 1.4 x 1.02mm