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. 738-5342
Mfr. Part No.TL431BSA-7
R 2.852
Each (In a Pack of 25)
units
2.5 - 36V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 3 - - 3 x 1.4 x 1mm
RS stock no. 122-0328
Mfr. Part No.TL431BSA-7
R 1.573
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 100mA 40 V 2.5 V 36 V 3 - - 3 x 1.4 x 1mm
RS stock no. 738-5333
Mfr. Part No.TL431ASA-7
R 0.822
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. 121-9495
Mfr. Part No.TL431ASA-7
R 0.777
Each (On a Reel of 3000)
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. 428-436
Mfr. Part No.TL431ACLP
R 8.67
Each
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. 145-1010
Mfr. Part No.TL431ACLP
R 2.612
Each (In a Bag of 1000)
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. 162-4726
Mfr. Part No.LM385Z-1.2/NOPB
R 5.403
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. 534-2860
Mfr. Part No.LM385Z-1.2/NOPB
R 12.95
Each
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. 779-8903
Mfr. Part No.LM399H#PBF
R 213.15
Each
units
6.95V TO-46 Fixed ±5 % Through Hole Shunt 10mA - - 6.95 V 4 - - 10.389 (Dia.) x 5.943mm
RS stock no. 889-5815
Mfr. Part No.MCP1541T-I/TT
BrandMicrochip
R 6.709
Each (On a Reel of 3000)
units
4.096V SOT-23 Precision 1% Surface Mount Series 20mA 7 V 4.055 V 4.137 V 3 350 μV/V 1.3 mV/mA 2.9 x 1.3 x 0.95mm
RS stock no. 145-0736
Mfr. Part No.LM399H#PBF
R 206.907
Each (In a Tube of 20)
units
6.95V TO-46 Fixed ±5 % Through Hole Shunt 10mA - - 6.95 V 4 - - 10.389 (Dia.) x 5.943mm
RS stock no. 163-0322
Mfr. Part No.TL431ACLPG
R 2.846
Each (In a Bag of 2000)
units
2.5 - 36V TO-92 Programmable ±1.0 % Through Hole Shunt 100mA - - 36 V 3 53 mV 25 mV 5.2 x 4.19 x 5.33mm
RS stock no. 698-9047
Mfr. Part No.MCP1541T-I/TT
BrandMicrochip
R 13.71
Each
units
4.096V SOT-23 Precision 1% Surface Mount Series 20mA 7 V 4.055 V 4.137 V 3 350 μV/V 1.3 mV/mA 2.9 x 1.3 x 0.95mm
RS stock no. 862-4976
Mfr. Part No.TL431ACLPG
R 6.694
Each (In a Pack of 50)
units
2.5 - 36V TO-92 Programmable ±1.0 % Through Hole Shunt 100mA - - 36 V 3 53 mV 25 mV 5.2 x 4.19 x 5.33mm
RS stock no. 121-8925
Mfr. Part No.LM4040D20IDBZT
R 10.332
Each (On a Reel of 250)
units
2.048V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - - 3 - 8 mV 2.92 x 1.3 x 1mm
RS stock no. 523-6125
Mfr. Part No.REF193GSZ
R 63.07
Each
units
3V SOIC Fixed ±0.07 % Surface Mount Series 30mA 18 V 2.99 V 3 V 8 8 ppm/V 15 ppm/mA 5 x 4 x 1.5mm
RS stock no. 533-8489
Mfr. Part No.LM4040DIM3-2.5/NOPB
R 10.096
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. 661-9376
Mfr. Part No.LM4040D41IDBZR
R 11.332
Each (In a Pack of 5)
units
4.096V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - - 3 - 9 mV 2.92 x 1.3 x 1mm
RS stock no. 535-9521
Mfr. Part No.LM4040AIM3-3.0/NOPB
R 31.048
Each (In a Pack of 5)
units
3V SOT-23 Fixed ±0.1 % Surface Mount Shunt 15mA 37 V - - 3 - 6 mV 2.92 x 1.3 x 0.93mm
RS stock no. 111-1150
Mfr. Part No.REF193GSZ
R 52.421
Each (In a Tube of 98)
units
3V SOIC Fixed ±0.07 % Surface Mount Series 30mA 18 V 2.99 V 3 V 8 8 ppm/V 15 ppm/mA 5 x 4 x 1.5mm