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. 145-1262
Mfr. Part No.LM385LPE3-1-2
HK$2.487
Each (In a Bag of 1000)
units
1.235V TO-92 Fixed ±2.0 % Through Hole Shunt 20mA - 1.21 V 1.26 V 3 - 20 mV 4.83 x 3.43 x 3.68mm
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
RS Stock No. 822-5907
Mfr. Part No.LT1634BCS8-1.25#PBF
HK$48.44
Each (In a Pack of 2)
units
1.25V SOIC Fixed ±0.05 % Surface Mount Shunt 1µA - 1.25 V 5 V 8 - - 5.004 x 3.98 x 1.498mm
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. 534-2860
Mfr. Part No.LM385Z-1.2/NOPB
HK$6.16
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. 651-3293
Mfr. Part No.LM4132DMF-4.1/NOPB
HK$19.31
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. 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. 162-5824
Mfr. Part No.LM4040C41IDBZR
HK$3.01
Each (On a Reel of 3000)
units
4.096V SOT-23 Fixed ±0.5 % Surface Mount Shunt 15mA - - - 3 - 7 mV 2.92 x 1.3 x 1mm
RS Stock No. 661-9423
Mfr. Part No.LT1009CDR
HK$11.12
Each (In a Pack of 5)
units
2.5V SOIC Fixed ±0.2 % Surface Mount Shunt 10mA - 2.485 V 2.515 V 8 - 10 mV 4.9 x 3.91 x 1.58mm
RS Stock No. 774-3486
Mfr. Part No.LM385BZ-2.5G
HK$5.56
Each (In a Pack of 5)
units
2.5V TO-92 Fixed ±1.5 % Through Hole Shunt 20mA - - 2.5 V 3 - - 5.2 x 4.19 x 5.33mm
RS Stock No. 165-8415
Mfr. Part No.ZXRE330ASA-7
HK$2.88
Each (On a Reel of 3000)
units
3.3V SOT-23 Fixed ±0.5 % Surface Mount Shunt 5mA - - - 3 - - 3 x 1.4 x 1mm
RS Stock No. 122-1254
Mfr. Part No.ZTL431AH6TA
HK$1.13
Each (On a Reel of 3000)
units
2.5V SC-70 Adjustable ±1.0 % Surface Mount Shunt 100mA 20 V 2.475 V 20 V 6 - - 2 x 1.35 x 1mm
RS Stock No. 517-2172
Mfr. Part No.TL1431CD
HK$3.68
Each (In a Pack of 5)
units
2.5 - 36V 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. 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. 121-8561
Mfr. Part No.REF3040AIDBZT
HK$7.363
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
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. 121-9495
Mfr. Part No.TL431ASA-7
HK$0.659
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. 163-1234
Mfr. Part No.TLV431BSN1T1G
HK$1.133
Each (On a Reel of 3000)
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. 802-3903
Mfr. Part No.ADR4540ARZ
HK$52.88
Each
units
4.096V SOIC Fixed ±0.04 % Surface Mount Series 10mA 15 V - - 8 10 ppm/V 120 ppm/mA 5 x 4 x 1.5mm
RS Stock No. 738-5333
Mfr. Part No.TL431ASA-7
HK$2.709
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
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