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. 122-1254
Mfr. Part No.ZTL431AH6TA
HK$1.244
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$1.301
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. 921-0720
Mfr. Part No.LM4040D30FTA
HK$2.633
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. 751-5221
Mfr. Part No.ZTL431AH6TA
HK$3.076
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. 921-0543
Mfr. Part No.AP4310AMTR-G1
HK$2.094
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. 165-8415
Mfr. Part No.ZXRE330ASA-7
HK$3.248
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. 169-7423
Mfr. Part No.ZHT431F02TA
HK$4.774
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. 921-0833
Mfr. Part No.ZXRE330ASA-7
HK$4.106
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. 823-1794
Mfr. Part No.ZHT431F02TA
HK$4.03
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$2.036
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. 121-9495
Mfr. Part No.TL431ASA-7
HK$0.616
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$1.856
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. 121-9938
Mfr. Part No.ZRC250F02TA
HK$4.00
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. 921-0366
Mfr. Part No.AN431BN-ATRG1
HK$0.741
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. 751-5391
Mfr. Part No.ZXRE125CFTA
HK$15.148
Each (On a Tape of 5)
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
RS Stock No. 823-1817
Mfr. Part No.ZTLV431AFTA
HK$2.586
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. 122-3398
Mfr. Part No.ZRB500F01TA
HK$3.524
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. 122-2326
Mfr. Part No.AP431ASAG-7
HK$0.907
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 250mA - 2.507 V 36 V 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 922-8169
Mfr. Part No.ZR431F005TA
HK$3.137
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. 738-5175
Mfr. Part No.ZXRE125DFTA
HK$9.67
Each (In a Pack of 5)
units
1.22V SOT-23 Fixed ±1.0 % Surface Mount Shunt 20mA - 1.21 V 1.23 V 3 - 20 mV 3.04 x 1.4 x 1.02mm