Isolation Amplifiers

Isolation Amplifiers are instruments that have been designed to measure the smallest current and voltage signals in the presence of high common mode voltage by providing electrical safety barrier and electrical isolation. They are differential amplifiers that protect data acquisition components from common mode voltages, which are potential differences between instrument ground and signal ground.

How to select a correct isolation amplifier?
There are two main types of isolation amplifiers and the decision of using one or another may depend on several aspects and user needs:

• Single-ended, floating common - an isolated and quasi-balanced input (the floating common is typically connected to the (-) input of differential amplifier). Suitable for off-ground measurements up to breakdown voltage of the isolation barrier, and exhibits very good common mode rejection (100 dB typical).

• Differential, floating common - an isolated and balanced input. Suitable for off-ground measurements of the breakdown voltage of the isolation barrier, and exhibits superb common mode rejection (>120 dB).

What is typical application of isolation amplifiers?
Isolation amplifiers are commonly used in test and measurement or medical devices. Also, they are popular in solar and fuel cells construction to profile the performance of individual series-connected voltage cells.

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Description Price Power Supply Type Typical Dual Supply Voltage Typical Single Supply Voltage Isolation Mode Rejection Rail to Rail Number of Channels per Chip Maximum Voltage Gain Mounting Type Package Type Pin Count Dimensions Height Width Length
RS Stock No. 159-9305
Mfr. Part No.ADUM4190TRIZ
TWD98.50
Each (In a Tube of 37)
units
Single - 3 → 20 V 72dB - 1 80dB Surface Mount SOIC 16 12.85 x 7.6 x 2.44mm 2.44mm 7.6mm 12.85mm
RS Stock No. 121-9702
Mfr. Part No.AMC1200SDUB
TWD157.00
Each (In a Tube of 50)
units
Dual 5V - - - 1 8 Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS Stock No. 803-0747
Mfr. Part No.ACPL-782T-300E
BrandBroadcom
TWD373.00
Each
units
- - - - - - - Surface Mount DIP - - - - -
RS Stock No. 830-4981
Mfr. Part No.ACPL-C87BT-000E
BrandBroadcom
TWD366.00
Each
units
Single - 3 → 5.5 V - - 1 1.005V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 817-5789
Mfr. Part No.AMC1200SDUB
TWD185.00
Each
units
Dual 5V - - - 1 8 Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS Stock No. 178-3206
Mfr. Part No.ACPL-C784-000E
BrandBroadcom
TWD179.10
Each (In a Tube of 80)
units
Single - 5 V 76dB - 1 18.49dB Surface Mount SSOP 8 3.18 x 5.85 x 6.81mm 3.18mm 6.81mm 5.85mm
RS Stock No. 786-3158
Mfr. Part No.ADUM4190ARIZ
TWD105.50
Each (In a Pack of 2)
units
Single - 3 → 20 V - - 1 80dB Surface Mount SOIC 16 12.85 x 7.6 x 2.44mm 2.44mm 7.6mm 12.85mm
RS Stock No. 159-9303
Mfr. Part No.ADUM3190SRQZ
TWD77.50
Each (In a Tube of 98)
units
Single - 3 → 20 V 72dB - 1 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 714-0209
Mfr. Part No.ACPL-C79A-000E
BrandBroadcom
TWD182.00
Each
units
Single - 4.5 → 5.5 V - - 2 8.28V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 734-4966
Mfr. Part No.ACPL-785J-000E
BrandBroadcom
TWD197.00
Each
units
Single - 4.5 → 5.5 V - - - - Surface Mount SOIC 16 10.312 x 7.493 x 3.505mm 3.505mm 7.493mm 10.31mm
RS Stock No. 825-3164
Mfr. Part No.AMC1200SDUBR
TWD154.50
Each (In a Pack of 2)
units
Single - 5 V 108dB - 1 8dB Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS Stock No. 910-8257
Mfr. Part No.ACPL-798J-000E
BrandBroadcom
TWD204.00
Each
units
Single - 3 → 5.5 (VDD2) V, 4.5 → 5.5 (VDD1) V - - - - Surface Mount SOIC 16 10.31 x 7.49 x 3.5mm 3.5mm 7.49mm 10.31mm
RS Stock No. 768-7893
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
TWD171.00
Each
units
Single - 4.5 → 5.5 V -78dB - 1 1.03V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 795-1453
Mfr. Part No.Si8261ACA-C-IS
TWD38.60
Each (In a Pack of 10)
units
Single - 5 → 30 V - Rail to Rail Output 1 - Surface Mount SOIC 8 5 x 4 x 1.55mm 1.55mm 5mm 5mm
RS Stock No. 178-3173
Mfr. Part No.ACPL-782T-300E
BrandBroadcom
TWD352.30
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 197-7180
Mfr. Part No.ISO122P
TWD1,117.00
Each
units
Single ±15V - 140dB - - - - PDIP 8 - - - -
RS Stock No. 178-3210
Mfr. Part No.ACPL-C79A-000E
BrandBroadcom
TWD184.80
Each (In a Tube of 80)
units
Single - 4.5 → 5.5 V - - 2 8.28V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 795-1472
Mfr. Part No.Si8261BAA-C-IS
TWD45.00
Each (In a Pack of 5)
units
Single - 5 → 30 V - Rail to Rail Output 1 - Surface Mount SOIC 8 5 x 4 x 1.55mm 1.55mm 5mm 5mm
RS Stock No. 734-4931
Mfr. Part No.ACPL-C790-000E
BrandBroadcom
TWD194.00
Each
units
Single - 3 → 5.5 V - - 1 8.44V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 921-3000
Mfr. Part No.AMC1200SDUBR
TWD135.80
Each (On a Reel of 350)
units
Single - 5 V 108dB - 1 8dB Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm