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. 165-8319
Mfr. Part No.AZ431LANTR-G1
SGD0.14
Each (On a Reel of 3000)
units
1.24V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 18 V 1.24 V 18 V 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 921-0717
Mfr. Part No.AZ431LANTR-G1
SGD0.457
Each (In a Pack of 50)
units
1.24V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 18 V 1.24 V 18 V 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 921-0363
Mfr. Part No.AN431AN-ATRG1
SGD0.142
Each (In a Pack of 100)
units
2.5V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 36 V 2.5 V 36 V 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 823-1801
Mfr. Part No.ZR40402F25TA
SGD0.896
Each (In a Pack of 50)
units
2.5V SOT-23 Fixed ±2.0 % Surface Mount Series - - - - 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 922-7601
Mfr. Part No.ZR431FTA
SGD0.334
Each (On a Reel of 3000)
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. 751-5234
Mfr. Part No.ZTL432AFTA
SGD0.428
Each (On a Tape of 50)
units
2.5V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 20 V 2.5 V 20 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 738-5115
Mfr. Part No.ZRC400F01TA
SGD1.816
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. 121-9572
Mfr. Part No.ZTL431AFTA
SGD0.124
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. 146-0949
Mfr. Part No.AS431BNTR-G1
SGD0.095
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. 921-0657
Mfr. Part No.AS431BNTR-G1
SGD0.173
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
SGD0.725
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. 751-5228
Mfr. Part No.ZTL431AFTA
SGD0.428
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. 165-8507
Mfr. Part No.AN431AN-ATRG1
SGD0.08
Each (On a Reel of 3000)
units
2.5V SOT-23 Adjustable ±0.5 % 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
SGD0.628
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. 922-8184
Mfr. Part No.ZRC400F01TA
SGD0.832
Each (On a Reel of 3000)
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. 165-8339
Mfr. Part No.AP4310AMTR-G1
SGD0.235
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. 122-2409
Mfr. Part No.ZR40402F25TA
SGD0.361
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. 122-1256
Mfr. Part No.ZTL432AFTA
SGD0.118
Each (On a Reel of 3000)
units
2.5V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 20 V 2.5 V 20 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 121-9503
Mfr. Part No.AP432ASAG-7
SGD0.415
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. 122-0304
Mfr. Part No.ZHT431F01TA
SGD0.814
Each (On a Reel of 3000)
units
2.5V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA - 2.5 V 20 V 3 - - 3.04 x 1.4 x 1.02mm