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. 535-9616
Mfr. Part No.LM4040CIM3-4.1/NOPB
HK$5.82
Each (In a Pack of 5)
units
4.1V SOT-23 Fixed ±0.5 % Surface Mount Shunt 15mA - - - 3 - 7 mV 2.92 x 1.3 x 0.93mm
RS Stock No. 159-8079
Mfr. Part No.AD588JQ
HK$268.95
Each (In a Tube of 25)
units
±10 V, ±5 V CERDIP Programmable ±0.06 % Through Hole Series 10mA 36 V - 10 V 16 ±200 μV/V ±50 μV/mA 21.34 x 7.87 x 3.56mm
RS Stock No. 121-8299
Mfr. Part No.REF5045AID
HK$26.172
Each (In a Tube of 75)
units
4.5V 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. 162-5894
Mfr. Part No.TL431ACDBVR
HK$0.821
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23 Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 5 - - 2.9 x 1.6 x 1.15mm
RS Stock No. 714-1114
Mfr. Part No.TL431CDT
HK$2.67
Each (In a Pack of 20)
units
2.5 - 36V SOIC Adjustable ±2.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.9 x 1.25mm
RS Stock No. 168-6826
Mfr. Part No.TL431CDT
HK$0.941
Each (On a Reel of 2500)
units
2.5 - 36V SOIC Adjustable ±2.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.9 x 1.25mm
RS Stock No. 711-2475
Mfr. Part No.TL431AIDR
HK$3.51
Each (In a Pack of 5)
units
2.5 - 36V SOIC Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.91 x 1.58mm
RS Stock No. 661-9653
Mfr. Part No.TLVH431BQDBZT
HK$11.99
Each (In a Pack of 5)
units
1.24 - 18V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 70mA 20 V 1.24 V 18 V 3 - - 2.92 x 1.3 x 1mm
RS Stock No. 889-5137
Mfr. Part No.MCP1525T-I/TT
BrandMicrochip
HK$4.96
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±1.0 % Surface Mount Series 20mA 7 V 2.475 V 2.525 V 3 350 μV/V 1.3 mV/mA 2.9 x 1.3 x 0.95mm
RS Stock No. 154-7674
Mfr. Part No.LM329BZ#PBF
HK$17.949
Each (In a Bag of 100)
units
6.9V TO-92 Fixed ±5 % Through Hole Shunt 15mA - - 6.9 V 3 - - 4.572 x 4.572 x 3.556mm
RS Stock No. 159-7584
Mfr. Part No.ADR02AKSZ-REEL7
HK$15.558
Each (On a Reel of 3000)
units
5V SC-70 Fixed ±0.1 % Through Hole Series 10mA 36 V 4.995 V 5.005 V 5 40 ppm/V 80 ppm/mA 2.2 x 1.35 x 1mm
RS Stock No. 163-0424
Mfr. Part No.CAT102TDI-GT3
HK$3.88
Each (On a Reel of 3000)
units
- TSOT-23 Adjustable ±1.0 % Surface Mount Shunt - 20 V 20 V - 5 1 mV 8 mV 2.9 x 1.6 x 0.9mm
RS Stock No. 779-8909
Mfr. Part No.LM329BZ#PBF
HK$27.75
Each (In a Pack of 2)
units
6.9V TO-92 Fixed ±5 % Through Hole Shunt 15mA - - 6.9 V 3 - - 4.572 x 4.572 x 3.556mm
RS Stock No. 808-3959
Mfr. Part No.CAT102TDI-GT3
HK$8.15
Each (In a Pack of 10)
units
0.6V TSOT-23 Adjustable ±1.0 % Surface Mount Shunt - 20 V 20 V - 5 1 mV 8 mV 2.9 x 1.6 x 0.9mm
RS Stock No. 121-8776
Mfr. Part No.LM4040DIZ-5.0/NOPB
HK$2.11
Each (In a Box of 1800)
units
5V TO-92 Fixed ±1.0 % Through Hole Shunt 15mA - - - 3 - - 5.2 x 4.19 x 5.2mm
RS Stock No. 533-8489
Mfr. Part No.LM4040DIM3-2.5/NOPB
HK$5.336
Each (In a Pack of 5)
units
2.5V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - - 3 - 8 mV 2.92 x 1.3 x 0.93mm
RS Stock No. 162-5937
Mfr. Part No.TLVH431BQDBZT
HK$7.58
Each (On a Reel of 250)
units
1.24 - 18V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 70mA 20 V 1.24 V 18 V 3 - - 2.92 x 1.3 x 1mm
RS Stock No. 698-9069
Mfr. Part No.MCP1525T-I/TT
BrandMicrochip
HK$6.79
Each
units
2.5V SOT-23 Fixed ±1.0 % Surface Mount Series 20mA 7 V 2.475 V 2.525 V 3 350 μV/V 1.3 mV/mA 2.9 x 1.3 x 0.95mm
RS Stock No. 121-9267
Mfr. Part No.TL431AIDR
HK$0.941
Each (On a Reel of 2500)
units
2.5 - 36V SOIC Adjustable ±1.0 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 4.9 x 3.91 x 1.58mm
RS Stock No. 534-3065
Mfr. Part No.LM4040DIZ-5.0/NOPB
HK$5.39
Each
units
5V TO-92 Precision 1% Through Hole Shunt 15mA - - - 3 - - 5.2 x 4.19 x 5.2mm
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