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. 145-6681
Mfr. Part No.REF5040AID
HK$26.333
Each (In a Tube of 75)
units
4.096V SOIC Fixed ±0.05 % Surface Mount Series 10mA 18 V - - 8 1 ppm/V 50 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 145-1262
Mfr. Part No.LM385LPE3-1-2
HK$2.487
Each (In a Bag of 1000)
units
1.235V TO-92 Fixed ±2.0 % Through Hole Shunt 20mA - 1.21 V 1.26 V 3 - 20 mV 4.83 x 3.43 x 3.68mm
RS Stock No. 713-9899
Mfr. Part No.NJM431M
HK$6.40
Each (In a Pack of 5)
units
2.5 - 36V DMP Adjustable ±2.2 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - 0.1 % 5 x 5 x 1.6mm
RS Stock No. 160-0694
Mfr. Part No.ADR4540ARZ
HK$39.661
Each (In a Tube of 98)
units
4.096V SOIC Fixed ±0.04 % Surface Mount Series 10mA 15 V - - 8 10 ppm/V 120 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 533-8467
Mfr. Part No.LM4040AIM3-4.1/NOPB
HK$15.72
Each (In a Pack of 5)
units
4.096V SOT-23 Fixed ±0.1 % Surface Mount Shunt 15mA - - - 3 - 7 mV 2.92 x 1.3 x 0.93mm
RS Stock No. 535-9537
Mfr. Part No.LM4040AIZ-4.1/NOPB
HK$15.148
Each (In a Pack of 5)
units
4.1V TO-92 Fixed ±0.1 % Through Hole Shunt 15mA - - - 3 - 7 mV 5.2 x 4.19 x 5.2mm
RS Stock No. 661-9297
Mfr. Part No.LM385DRG4-2-5
HK$4.598
Each (In a Pack of 5)
units
2.5V SOIC Fixed ±3 % Surface Mount Shunt 20mA - 2.425 V 2.575 V 8 - 20 mV 4.9 x 3.91 x 1.58mm
RS Stock No. 121-8712
Mfr. Part No.LM4040AIM3-4.1/NOPB
HK$8.467
Each (On a Reel of 1000)
units
4.096V SOT-23 Fixed ±0.1 % Surface Mount Shunt 15mA - - - 3 - 7 mV 2.92 x 1.3 x 0.93mm
RS Stock No. 163-0923
Mfr. Part No.LM385BZ-2.5G
HK$2.353
Each (In a Bag of 2000)
units
2.5V TO-92 Fixed ±1.5 % Through Hole Shunt 20mA - - 2.5 V 3 - - 5.2 x 4.19 x 5.33mm
RS Stock No. 797-4829
Mfr. Part No.TL431AQDBZR,215
BrandNexperia
HK$2.43
Each (On a Tape of 50)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.495 V 36 V 3 - - 3 x 1.4 x 1mm
RS Stock No. 169-8210
Mfr. Part No.NJM431M
HK$2.965
Each (In a Tube of 100)
units
2.5 - 36V DMP Adjustable ±2.2 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - 0.1 % 5 x 5 x 1.6mm
RS Stock No. 461-9535
Mfr. Part No.REF3020AIDBZT
HK$13.416
Each (In a Pack of 5)
units
2.048V SOT-23 Fixed ±0.2 % Surface Mount Series 25mA 7 V 2.044 V 2.052 V 3 290 μV/V 100 μV/mA 2.92 x 1.3 x 1mm
RS Stock No. 921-0720
Mfr. Part No.LM4040D30FTA
HK$3.636
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. 661-9341
Mfr. Part No.LM4040C41IDBZR
HK$7.468
Each (In a Pack of 5)
units
4.096V SOT-23 Fixed ±0.5 % Surface Mount Shunt 15mA - - - 3 - 7 mV 2.92 x 1.3 x 1mm
RS Stock No. 809-5217
Mfr. Part No.LM4040B25IDBZT
HK$16.356
Each (On a Tape of 20)
units
2.5V SOT-23 Fixed ±0.2 % Surface Mount Shunt 80µA - - 2.5 V 3 - - 3.04 x 1.4 x 1.02mm
RS Stock No. 809-5374
Mfr. Part No.TL431AILP
HK$3.274
Each (In a Pack of 5)
units
2.5 - 36V TO-92 Adjustable ±1.0 % Through Hole Shunt 100mA - - 36 V 3 - - 5.21 x 4.19 x 5.34mm
RS Stock No. 912-6665
Mfr. Part No.ADR444BRZ
HK$57.859
Each (In a Tube of 98)
units
4.096V SOIC Fixed ±0.04 % Surface Mount Series 10mA 20 V 4.094 V 4.098 V 8 20 ppm/V 50 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 162-5820
Mfr. Part No.LM4040B25IDBZR
HK$9.506
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±0.2 % Surface Mount Shunt 15mA - - - 3 - 6 mV 2.92 x 1.3 x 1mm
RS Stock No. 154-7683
Mfr. Part No.LT1034BCZ-2.5#PBF
HK$35.238
Each (In a Bag of 100)
units
2.5V TO-92 Fixed ±1.6 % Through Hole Shunt 20mA - - 2.5 V 3 - - 4.572 x 4.572 x 3.556mm
RS Stock No. 922-2230
Mfr. Part No.LMV431BIMF/NOPB
HK$4.19
Each (On a Reel of 1000)
units
1.24 - 30V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 15mA - 1.224 V 1.259 V 3 - - 2.92 x 1.3 x 0.93mm
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