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. 823-1794
Mfr. Part No.ZHT431F02TA
HK$7.653
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. 738-5333
Mfr. Part No.TL431ASA-7
HK$2.678
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. 921-0720
Mfr. Part No.LM4040D30FTA
HK$3.77
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. 921-0833
Mfr. Part No.ZXRE330ASA-7
HK$5.859
Each (In a Pack of 20)
units
3.3V SOT-23 Fixed ±0.5 % Surface Mount Shunt 5mA - - - 3 - - 3 x 1.4 x 1mm
RS Stock No. 169-7423
Mfr. Part No.ZHT431F02TA
HK$3.893
Each (On a Reel of 3000)
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. 165-8415
Mfr. Part No.ZXRE330ASA-7
HK$3.044
Each (On a Reel of 3000)
units
3.3V SOT-23 Fixed ±0.5 % Surface Mount Shunt 5mA - - - 3 - - 3 x 1.4 x 1mm
RS Stock No. 751-5221
Mfr. Part No.ZTL431AH6TA
HK$3.286
Each (On a Tape of 25)
units
2.5V SC-70 Adjustable ±1.0 % Surface Mount Shunt 100mA 20 V 2.475 V 20 V 6 - - 2 x 1.35 x 1mm
RS Stock No. 122-1254
Mfr. Part No.ZTL431AH6TA
HK$1.256
Each (On a Reel of 3000)
units
2.5V SC-70 Adjustable ±1.0 % Surface Mount Shunt 100mA 20 V 2.475 V 20 V 6 - - 2 x 1.35 x 1mm
RS Stock No. 165-8339
Mfr. Part No.AP4310AMTR-G1
HK$1.512
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. 921-0543
Mfr. Part No.AP4310AMTR-G1
HK$3.564
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. 121-9495
Mfr. Part No.TL431ASA-7
HK$0.683
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. 165-8407
Mfr. Part No.LM4040D30FTA
HK$1.504
Each (On a Reel of 3000)
units
3V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - - 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 751-5228
Mfr. Part No.ZTL431AFTA
HK$2.478
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. 122-0334
Mfr. Part No.TLV431BE5TA
HK$1.679
Each (On a Reel of 3000)
units
1.24 - 18V SOT-25 Adjustable ±0.5 % Surface Mount Shunt 20mA 20 V 1.24 V 18 V 5 - - 3.1 x 1.8 x 1.3mm
RS Stock No. 122-0259
Mfr. Part No.LM4040D50FTA
HK$1.729
Each (On a Reel of 3000)
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. 122-0335
Mfr. Part No.TLV431AFTA
HK$0.962
Each (On a Reel of 3000)
units
1.24 - 18V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 20mA 20 V 1.24 V 18 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 206-0266
Mfr. Part No.LM4040B33QFTA
HK$3.298
Each (On a Reel of 3000)
units
3.3V SOT-23 Precision 0.2% Surface Mount Shunt - - - - 3 - - -
RS Stock No. 738-5109
Mfr. Part No.ZRB500F03TA
HK$9.074
Each (In a Pack of 5)
units
5V SOT-23 Fixed ±3 % Surface Mount Shunt 15mA - 4.85 V 5.15 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 206-0272
Mfr. Part No.LM4040C41QFTA
HK$2.071
Each (On a Reel of 3000)
units
4.096V SOT-23 Precision 0.5% Surface Mount Shunt - - - - 3 - - -
RS Stock No. 122-0332
Mfr. Part No.TL432ASA-7
HK$0.77
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