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. 671-0292
Mfr. Part No.LM336Z5
PHP18.25
Each (In a Pack of 5)
units
5V TO-92 Programmable ±1.0 % Through Hole Shunt 400mA - 4.8 V 5.2 V 3 - 20 mV 4.58 x 3.86 x 4.58mm
RS Stock No. 805-6758
Mfr. Part No.TL431ACDG
PHP19.819
Each (In a Pack of 50)
units
2.5 - 36V SOIC Programmable ±1.0 % Surface Mount Shunt 100mA - - 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 864-7878
Mfr. Part No.TL431ACDR2G
PHP16.147
Each (In a Pack of 50)
units
2.5 - 36V SOIC Programmable ±1.0 % Surface Mount Shunt 100mA - 2.44 V 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 739-0300
Mfr. Part No.KA431AZTA
PHP10.849
Each (In a Pack of 10)
units
2.5 - 36V TO-92 Programmable ±1.0 % Through Hole Shunt 100mA - 2.5 V 36 V 3 - - 4.58 x 3.86 x 4.58mm
RS Stock No. 163-2402
Mfr. Part No.LM285Z-2.5G
PHP12.578
Each (In a Bag of 2000)
units
2.5V TO-92 Fixed ±1.5 % Through Hole Shunt 20mA - 2.462 V 2.538 V 3 - 10 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 463-246
Mfr. Part No.TL431CLPG
PHP14.402
Each (In a Pack of 50)
units
2.5 - 36V TO-92 Adjustable ±2.2 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 5.2 x 4.19 x 5.33mm
RS Stock No. 163-0321
Mfr. Part No.TL431ACDR2G
PHP6.547
Each (On a Reel of 2500)
units
2.5 - 36V SOIC Programmable ±1.0 % Surface Mount Shunt 100mA - 2.44 V 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 166-2430
Mfr. Part No.KA431AZTA
PHP3.10
Each (On a Tape of 2000)
units
2.5 - 36V TO-92 Programmable ±1.0 % Through Hole Shunt 100mA - 2.5 V 36 V 3 - - 4.58 x 3.86 x 4.58mm
RS Stock No. 739-0448
Mfr. Part No.LM336Z25
PHP18.90
Each (In a Pack of 5)
units
2.5V TO-92 Fixed ±1.0 % Through Hole Shunt - - 2.44 V 2.54 V 3 - 10 mV 4.58 x 3.86 x 4.58mm
RS Stock No. 805-4588
Mfr. Part No.TL431IDG
PHP20.21
Each (In a Pack of 50)
units
2.5 - 36V SOIC Programmable ±1.0 % Surface Mount Shunt 100mA - - 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 463-492
Mfr. Part No.LM285Z-2.5G
PHP29.98
Each (In a Pack of 10)
units
2.5V TO-92 Fixed ±1.5 % Through Hole Shunt 20mA - 2.462 V 2.538 V 3 - 10 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 463-498
Mfr. Part No.LM385Z-2.5G
PHP23.959
Each (In a Pack of 10)
units
2.5V TO-92 Fixed ±3 % Through Hole Shunt 20mA - 2.425 V 2.575 V 3 - 20 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 805-4581
Mfr. Part No.TL431BCDG
PHP19.019
Each (In a Pack of 50)
units
2.5 - 36V SOIC Fixed ±0.4 % Surface Mount Shunt 100mA - - 36 V 8 53 mV 25 mV 5 x 4 x 1.5mm
RS Stock No. 163-2419
Mfr. Part No.LM385Z-2.5G
PHP11.049
Each (In a Bag of 2000)
units
2.5V TO-92 Fixed ±3 % Through Hole Shunt 20mA - 2.425 V 2.575 V 3 - 20 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 145-3275
Mfr. Part No.TL431CLPG
PHP5.78
Each (In a Bag of 2000)
units
2.5 - 36V TO-92 Adjustable ±2.2 % Through Hole Shunt 100mA 37 V 2.5 V 36 V 3 - - 5.2 x 4.19 x 5.33mm
RS Stock No. 163-0924
Mfr. Part No.LM4040DTB-250GT3
PHP51.561
Each (On a Reel of 3000)
units
2.5V SOT-23 Fixed ±1.0 % Surface Mount Shunt 15mA - - 2.5 V 3 - - 3.04 x 1.04 x 1.12mm
RS Stock No. 774-3697
Mfr. Part No.TL431AILPG
PHP19.32
Each (In a Pack of 10)
units
2.5 - 36V TO-92 Programmable ±4 % Through Hole Shunt 100mA 37 V 2.495 V 36 V 3 53 mV 25 mV 5.2 x 4.19 x 5.33mm
RS Stock No. 186-8939
Mfr. Part No.TL431CDG
PHP13.737
Each (In a Tube of 98)
units
2.49V SOIC Programmable 2.2% Surface Mount Shunt - 2.56 V - 36 V 8 - - 5 x 4 x 1.5mm
RS Stock No. 166-2139
Mfr. Part No.KA431SAMF2TF
PHP4.31
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23F Programmable ±1.0 % Surface Mount Shunt - - - 36 V 3 - - 3 x 1.7 x 1mm
RS Stock No. 688-9335
Mfr. Part No.TL431CDR2G
PHP21.61
Each (In a Pack of 2)
units
2.5 - 36V SOIC Adjustable ±2.2 % Surface Mount Shunt 100mA 37 V 2.5 V 36 V 8 - - 5 x 4 x 1.5mm