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. 739-0448
Mfr. Part No.LM336Z25
$0.606
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. 166-2589
Mfr. Part No.LM336Z25
$0.15
Each (In a Bag of 10000)
units
2.5V TO-92 Programmable ±1.0 % Through Hole Shunt 15 (Reverse)mA - - - 3 - - 5.2 x 4.19 x 5.33mm
RS Stock No. 166-3103
Mfr. Part No.LM431SBCMFX
$0.121
Each (On a Reel of 3000)
units
2.5 - 36V SOT-23F Adjustable ±1.0 % Surface Mount Shunt 100 (Cathode)mA - 2.5 (Cathode) V 36 V 3 - - 3 x 1.7 x 1mm
RS Stock No. 806-4049
Mfr. Part No.LM431SBCMFX
$0.205
Each (On a Tape of 100)
units
2.5 - 36V SOT-23F Adjustable ±1.0 % Surface Mount Shunt 100 (Cathode)mA - 2.5 (Cathode) V 36 V 3 - - 3 x 1.7 x 1mm
RS Stock No. 463-498
Mfr. Part No.LM385Z-2.5G
$0.848
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. 145-2928
Mfr. Part No.LM385BD-2.5G
$0.999
Each (In a Tube of 98)
units
2.5V SOIC Fixed ±1.5 % Surface Mount Shunt - - - - 8 - - 5 x 4 x 1.5mm
RS Stock No. 163-2419
Mfr. Part No.LM385Z-2.5G
$0.437
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. 805-1387
Mfr. Part No.LM385BD-2.5G
$0.999
Each (In a Pack of 25)
units
2.5V SOIC Fixed ±1.5 % Surface Mount Shunt - - - - 8 - - 5 x 4 x 1.5mm
RS Stock No. 805-6758
Mfr. Part No.TL431ACDG
$0.628
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. 862-4922
Mfr. Part No.LM385BZ-1.2G
$0.908
Each (In a Pack of 25)
units
1.235V TO-92 Fixed ±1.0 % Through Hole Shunt - - - - 3 - - 5.2 x 4.19 x 5.33mm
RS Stock No. 808-3959
Mfr. Part No.CAT102TDI-GT3
$1.668
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. 145-3880
Mfr. Part No.TL431CDR2G
$0.17
Each (On a Reel of 2500)
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
RS Stock No. 145-3275
Mfr. Part No.TL431CLPG
$0.186
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. 166-1672
Mfr. Part No.LM431SCCMLX
$0.266
Each (On a Reel of 4000)
units
2.5 - 36V SOT-89 Adjustable ±0.5 % Surface Mount Shunt 100 (Cathode)mA - 2.5 (Cathode) V 36 V 3 - - 4.7 x 2.7 x 1.7mm
RS Stock No. 781-5553
Mfr. Part No.TLV431BSN1T1G
$0.565
Each (In a Pack of 20)
units
1.24 - 16V SOT-23 Adjustable ±0.5 % Surface Mount Shunt 20mA - 1.24 V 16 V 3 - - 3.04 x 1.04 x 1.01mm
RS Stock No. 163-2402
Mfr. Part No.LM285Z-2.5G
$0.501
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. 162-8888
Mfr. Part No.LM385BD-2.5R2G
$0.53
Each (On a Reel of 2500)
units
2.5V SOIC Fixed ±1.5 % Surface Mount Shunt - - - - 8 - - 5 x 4 x 1.5mm
RS Stock No. 145-2809
Mfr. Part No.LM385D-1.2G
$0.999
Each (In a Tube of 98)
units
1.235V SOIC Fixed ±2.0 % Surface Mount Shunt 20mA - 1.205 V 1.26 V 8 - 20 mV 5 x 4 x 1.5mm
RS Stock No. 774-3697
Mfr. Part No.TL431AILPG
$0.633
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. 806-4030
Mfr. Part No.LM431CIMX
$0.668
Each (On a Tape of 25)
units
2.5 - 36V SOIC Adjustable ±0.5 % Surface Mount Shunt 100 (Cathode)mA - 2.5 (Cathode) V 36 V 8 - - 5 x 4 x 1.5mm