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. 121-9267
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. 460-988
Mfr. Part No.LM385M-2.5/NOPB
HK$6.50
Each (In a Pack of 10)
units
2.5V SOIC Fixed ±3 % Surface Mount Shunt 20mA - - - 8 - 20 mV 4.9 x 3.9 x 1.45mm
RS Stock No. 121-8713
Mfr. Part No.LM4040DIM3-2.5/NOPB
HK$1.916
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. 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. 162-4726
Mfr. Part No.LM385Z-1.2/NOPB
HK$2.66
Each (In a Box of 1800)
units
1.235V TO-92 Fixed ±2.0 % Through Hole Shunt 20mA - - - 3 - 20 mV 5.2 x 4.19 x 5.2mm
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. 620-0802
Mfr. Part No.REF02AU
HK$41.84
Each (In a Pack of 5)
units
5V SOIC Fixed ±0.2 % Surface Mount Series - 40 V 4.985 V 5.015 V 8 0.01 %/V 0.01 %/mA 4.9 x 3.91 x 1.58mm
RS Stock No. 639-4496
Mfr. Part No.LM4120AIM5-2.5/NOPB
HK$18.684
Each (In a Pack of 5)
units
2.5V SOT-23 Fixed ±0.2 % Surface Mount Series 5mA 14 V - - 5 0.008 %/V 0.12 %/mA 2.92 x 1.6 x 1.02mm
RS Stock No. 168-4286
Mfr. Part No.LM4040B25IDBZT
HK$13.35
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. 661-9483
Mfr. Part No.TL1431CDR
HK$4.11
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. 779-8975
Mfr. Part No.LT1034BCZ-2.5#PBF
HK$56.90
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. 106-6989
Mfr. Part No.ADR02ARZ
HK$18.74
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. 404-326
Mfr. Part No.REF5040AID
HK$29.95
Each
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. 732-1345
Mfr. Part No.LM385BLPR-1-2
HK$6.59
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. 121-8561
Mfr. Part No.REF3040AIDBZT
HK$7.363
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 412-349
Mfr. Part No.ADR02ARZ
HK$24.196
Each (In a Pack of 5)
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. 158-0224
Mfr. Part No.ADR03BRZ
HK$39.36
Each (In a Tube of 98)
units
2.5V SOIC Fixed ±0.1 % Surface Mount Series 10mA 36 V 2.498 V 2.503 V 8 30 ppm/V 70 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 709-5308
Mfr. Part No.ADR444BRZ
HK$74.19
Each
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. 809-5374
Mfr. Part No.TL431AILP
HK$3.34
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. 168-4199
Mfr. Part No.ADR02ARZ-REEL7
HK$11.546
Each (On a Reel of 1000)
units
5V SOIC Fixed ±0.1 % Surface Mount Series 10mA 36 V 4.995 V 5.005 V 8 40 ppm/V 80 ppm/mA 5 x 4 x 1.5mm