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. 121-9180
Mfr. Part No.TL431AQDBZT
HK$3.186
Each (On a Reel of 250)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 3 - - 2.92 x 1.3 x 1mm
RS Stock No. 809-5378
Mfr. Part No.TL431AQDBZR
HK$3.25
Each (In a Pack of 5)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA - - 36 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 168-6332
Mfr. Part No.TL431ACLPR
HK$1.041
Each (On a Reel of 2000)
units
2.5 - 36V SOIC Adjustable ±0.5 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.91 x 1.58mm
RS Stock No. 428-436
Mfr. Part No.TL431ACLP
HK$9.23
Each
units
2.5 - 36V TO-92 Adjustable ±1.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 661-9524
Mfr. Part No.TL431AQDBZT
HK$4.994
Each (In a Pack of 5)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 3 - - 2.92 x 1.3 x 1mm
RS Stock No. 168-4288
Mfr. Part No.TL431AQDBZR
HK$0.819
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA - - 36 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 661-9809
Mfr. Part No.TL431ACLPR
HK$1.722
Each (In a Pack of 10)
units
2.5 - 36V TO-92 Adjustable ±1.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 145-1010
Mfr. Part No.TL431ACLP
HK$0.761
Each (In a Bag of 1000)
units
2.5 - 36V TO-92 Adjustable ±1.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 922-2492
Mfr. Part No.REF3033AIDBZT
HK$8.708
Each (On a Reel of 250)
units
3.3V SOT-23 Fixed ±0.2 % Surface Mount Series 25mA 7 V 3.294 V 3.3 V 3 400 μV/V 100 μV/mA 2.92 x 1.3 x 1mm
RS Stock No. 661-9442
Mfr. Part No.REF3033AIDBZT
HK$13.412
Each (In a Pack of 5)
units
3.3V SOT-23 Fixed ±0.2 % Surface Mount Series 25mA 7 V 3.294 V 3.3 V 3 400 μV/V 100 μV/mA 2.92 x 1.3 x 1mm
RS Stock No. 101-8304
Mfr. Part No.LM385Z-1.2G
HK$1.979
Each (In a Bag of 2000)
units
1.235V TO-92 Fixed ±2.0 % Through Hole Shunt 20mA - 1.205 V 1.26 V 3 - 20 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 463-482
Mfr. Part No.LM385Z-1.2G
HK$3.435
Each (In a Pack of 10)
units
1.235V TO-92 Fixed ±2.0 % Through Hole Shunt 20mA - 1.205 V 1.26 V 3 - 20 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 824-5466
Mfr. Part No.ZRC330F02TA
HK$5.344
Each (In a Pack of 10)
units
3.3V SOT-23 Fixed ±1.0 % Surface Mount Series - - - - 3 - - 3 x 1.4 x 1.1mm
RS Stock No. 776-0759
Mfr. Part No.NCP431ACSNT1G
HK$1.951
Each (In a Pack of 10)
units
2.5 - 36V SOT-23 Programmable ±1.0 % Surface Mount Shunt 100mA - 2.475 V 36 V 3 - - 3.04 x 1.4 x 1.01mm
RS Stock No. 121-8266
Mfr. Part No.TL431CLP
HK$0.98
Each (In a Box of 1000)
units
2.5 - 36V TO-92 Adjustable ±2.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 163-1004
Mfr. Part No.NCP431ACSNT1G
HK$0.629
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23 Programmable ±1.0 % Surface Mount Shunt 100mA - 2.475 V 36 V 3 - - 3.04 x 1.4 x 1.01mm
RS Stock No. 283-845
Mfr. Part No.TL431CLP
HK$10.38
Each
units
2.5 - 36V TO-92 Adjustable ±2.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 169-5617
Mfr. Part No.TL431CLPR
HK$0.522
Each (On a Reel of 2000)
units
2.5 - 36V TO-92 Adjustable ±2.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 661-9827
Mfr. Part No.TL431CLPR
HK$1.71
Each (In a Pack of 10)
units
2.5 - 36V TO-92 Adjustable ±2.0 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 4.83 x 3.43 x 3.68mm
RS Stock No. 165-9340
Mfr. Part No.MAX6107EUR+T
BrandMaxim
HK$7.852
Each (On a Reel of 2500)
units
4.5V SOT-23 Fixed ±0.4 % Surface Mount Series 5mA 12.6 V 4.482 V 4.518 V 3 550 μV/V 0.9 mV/mA, 8 mV/mA 3.04 x 1.4 x 1.02mm