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. 121-8839
Mfr. Part No.LM4040BIM3-2.5/NOPB
HK$4.493
Each (On a Reel of 1000)
units
2.5V SOT-23 Fixed ±0.2 % Surface Mount Shunt 15mA - - - 3 - 6 mV 2.92 x 1.3 x 0.93mm
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. 162-5824
Mfr. Part No.LM4040C41IDBZR
HK$3.01
Each (On a Reel of 3000)
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. 162-9967
Mfr. Part No.LM385BZ-1.2G
HK$2.33
Each (In a Bag of 2000)
units
1.235V TO-92 Fixed ±1.0 % Through Hole Shunt - - - - 3 - - 5.2 x 4.19 x 5.33mm
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. 912-6375
Mfr. Part No.ADR435BRZ
HK$57.039
Each (In a Tube of 98)
units
5V SOIC Fixed ±0.04 % Surface Mount Series 30mA 20 V 4.998 V 5.002 V 8 20 ppm/V 15 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 779-8975
Mfr. Part No.LT1034BCZ-2.5#PBF
HK$42.265
Each (In a Pack of 2)
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. 162-6244
Mfr. Part No.LM385BLPR-1-2
HK$3.165
Each (On a Reel of 2000)
units
1.235V TO-92 Fixed ±1.0 % Through Hole Shunt 20mA - 1.22 V 1.25 V 3 - 20 mV 5.21 x 4.19 x 5.34mm
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. 758-9727
Mfr. Part No.AD688AQ
HK$251.51
Each
units
10V CERDIP Fixed ±0.05 % Through Hole Series 10mA 36 V - 10 V 16 ±200 μV/V ±200 μV/mA 21.34 x 7.87 x 3.56mm
RS Stock No. 540-4154
Mfr. Part No.MAX6225ACSA+
HK$64.29
Each
units
2.5V SOIC Fixed ±0.02 % Surface Mount Series 15mA 40 V 2.499 V 2.501 V 8 18 ppm/V 1 ppm/mA 5 x 4 x 1.5mm
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. 158-1979
Mfr. Part No.AD1582BRTZ-REEL7
HK$11.417
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±0.08 % Surface Mount Series 5mA 12 V 2.498 V 2.502 V 3 25 μV/V 3.5 mV/mA 2.9 x 1.3 x 1.02mm
RS Stock No. 533-5799
Mfr. Part No.LM336Z-2.5/NOPB
HK$6.39
Each
units
2.5V TO-92 Fixed ±4 % Through Hole Shunt 10mA - 2.39 V 2.59 V 3 - 10 mV 5.2 x 4.19 x 5.2mm
RS Stock No. 158-5253
Mfr. Part No.AD586MNZ
HK$110.706
Each (In a Tube of 50)
units
5V PDIP Fixed ±0.04 % Through Hole Series 10mA 36 V 4.998 V 5.002 V 8 100 μV/V 400 μV/mA 9.27 x 7.24 x 3.43mm
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. 732-1345
Mfr. Part No.LM385BLPR-1-2
HK$4.556
Each (In a Pack of 5)
units
1.235V TO-92 Fixed ±1.0 % Through Hole Shunt 20mA - 1.22 V 1.25 V 3 - 20 mV 5.21 x 4.19 x 5.34mm
RS Stock No. 106-6989
Mfr. Part No.ADR02ARZ
HK$15.411
Each (In a Tube of 98)
units
5V SOIC Fixed ±0.1 % Surface Mount Series 10mA 36 V 4.995 V 5.005 V 8 30 ppm/V 70 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 708-9491
Mfr. Part No.AD581SH
HK$191.80
Each
units
10V TO-5 Fixed ±0.3 % Through Hole Series 10mA 40 V - - 3 0.005 %/V 500 μV/mA 9.4 x 9.4 x 4.7mm
RS Stock No. 461-9535
Mfr. Part No.REF3020AIDBZT
HK$13.272
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