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. 535-9672
Mfr. Part No.LM4040EIM3-2.5/NOPB
HK$3.768
Each (In a Pack of 5)
units
2.5V SOT-23 Fixed ±2.0 % Surface Mount Shunt 15mA - - - 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 889-5137
Mfr. Part No.MCP1525T-I/TT
BrandMicrochip
HK$4.458
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. 121-8776
Mfr. Part No.LM4040DIZ-5.0/NOPB
HK$3.141
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. 163-0424
Mfr. Part No.CAT102TDI-GT3
HK$4.894
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. 808-3959
Mfr. Part No.CAT102TDI-GT3
HK$5.029
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. 698-9069
Mfr. Part No.MCP1525T-I/TT
BrandMicrochip
HK$8.71
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. 121-8713
Mfr. Part No.LM4040DIM3-2.5/NOPB
HK$2.533
Each (On a Reel of 1000)
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. 779-8909
Mfr. Part No.LM329BZ#PBF
HK$23.855
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. 162-5937
Mfr. Part No.TLVH431BQDBZT
HK$5.103
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. 759-0446
Mfr. Part No.ADR02AKSZ-REEL7
HK$23.64
Each
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. 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. 711-2475
Mfr. Part No.TL431AIDR
HK$2.82
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. 162-9967
Mfr. Part No.LM385BZ-1.2G
HK$2.449
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. 809-5374
Mfr. Part No.TL431AILP
HK$3.09
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. 651-3293
Mfr. Part No.LM4132DMF-4.1/NOPB
HK$18.06
Each
units
4.096V SOT-23 Fixed ±0.4 % Surface Mount Series 20mA 6 V - - 5 100 ppm/V 25 ppm/mA 2.92 x 1.6 x 1.02mm
RS Stock No. 162-4727
Mfr. Part No.LM4040AIZ-4.1/NOPB
HK$8.568
Each (In a Box of 1800)
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$3.628
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. 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. 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. 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
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