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. 661-9290
Mfr. Part No.LM285DRG4-1-2
HK$4.564
Each (In a Pack of 5)
units
1.235V SOIC Fixed ±1.0 % Surface Mount Shunt 20mA - 1.223 V 1.247 V 8 - 12 mV 4.9 x 3.91 x 1.58mm
RS Stock No. 165-9765
Mfr. Part No.TL431AQDBZR,215
BrandNexperia
HK$0.736
Each (On a Reel of 3000)
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. 779-9167
Mfr. Part No.LT1236AIS8-10#PBF
HK$66.59
Each
units
10V SOIC Fixed ±0.05 % Surface Mount Series 10mA 40 V 9.95 V 10.05 V 8 6 ppm/V 40 ppm/mA 5.004 x 3.988 x 1.498mm
RS Stock No. 535-9559
Mfr. Part No.LM4040BIM3-2.5/NOPB
HK$8.848
Each (In a Pack of 5)
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. 822-5907
Mfr. Part No.LT1634BCS8-1.25#PBF
HK$41.88
Each (In a Pack of 2)
units
1.25V SOIC Fixed ±0.05 % Surface Mount Shunt 1µA - 1.25 V 5 V 8 - - 5.004 x 3.98 x 1.498mm
RS Stock No. 540-4154
Mfr. Part No.MAX6225ACSA+
BrandMaxim
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. 922-2230
Mfr. Part No.LMV431BIMF/NOPB
HK$4.128
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
RS Stock No. 165-8407
Mfr. Part No.LM4040D30FTA
HK$1.585
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. 522-8859
Mfr. Part No.AD586JNZ
HK$84.71
Each
units
5V PDIP Fixed ±0.4 % Through Hole Series 10mA 36 V 4.98 V 5.02 V 8 100 μV/V 400 μV/mA 9.27 x 7.24 x 3.43mm
RS Stock No. 527-984
Mfr. Part No.TL431AILPE3
HK$1.464
Each (In a Pack of 25)
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. 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. 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. 106-7078
Mfr. Part No.AD586JNZ
HK$57.967
Each (In a Tube of 50)
units
5V PDIP Fixed ±0.4 % Through Hole Series 10mA 36 V 4.98 V 5.02 V 8 100 μV/V 400 μV/mA 9.27 x 7.24 x 3.43mm
RS Stock No. 533-8467
Mfr. Part No.LM4040AIM3-4.1/NOPB
HK$14.896
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. 168-4286
Mfr. Part No.LM4040B25IDBZT
HK$12.584
Each (On a Reel of 250)
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. 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. 661-9483
Mfr. Part No.TL1431CDR
HK$3.262
Each (In a Pack of 5)
units
2.5V SOIC Adjustable ±0.4 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.91 x 1.58mm
RS Stock No. 165-9104
Mfr. Part No.MAX6225ACSA+
BrandMaxim
HK$93.30
Each (In a Tube of 100)
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. 121-8694
Mfr. Part No.LM336Z-2.5/NOPB
HK$2.734
Each (In a Box of 1800)
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. 534-2860
Mfr. Part No.LM385Z-1.2/NOPB
HK$5.85
Each
units
1.235V TO-92 Fixed ±2.0 % Through Hole Shunt 20mA - - - 3 - 20 mV 5.2 x 4.19 x 5.2mm