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. 146-6124
Mfr. Part No.ACNT-H870-000E
BrandBroadcom
SGD10.97
Each (In a Tube of 80)
units
Single - 4.5 → 5.5 V - - 2 1.01 Surface Mount SO 8 13.6 x 6.24 x 3.6mm 3.6mm 6.24mm 13.6mm
RS Stock No. 922-6633
Mfr. Part No.ACPL-C78A-000E
BrandBroadcom
SGD14.83
Each (In a Tube of 80)
units
Single - 5 V 76dB - 1 18.15dB Surface Mount SOIC 8 3.18 x 5.85 x 6.81mm 3.18mm 6.81mm 5.85mm
RS Stock No. 786-3154
Mfr. Part No.ADUM3190BRQZ
SGD4.26
Each (In a Pack of 2)
units
Single - 3 → 20 V - - 2 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 178-3215
Mfr. Part No.ACNT-H790-000E
BrandBroadcom
SGD11.59
Each (In a Tube of 80)
units
Single - 3 → 5.5 (VDD2) V, 4.5 → 5.5 (VDD1) V - - - 8.42V/V Surface Mount SOIC 8 13.6 x 6.24 x 3.4mm 3.4mm 6.24mm 13.6mm
RS Stock No. 106-7013
Mfr. Part No.AD202JN
SGD117.544
Each (In a Tube of 9)
units
Single - 15 V 130dB - 1 40dB Through Hole PDIP 11 8.9 x 53.3 x 17.8mm 8.9mm 17.8mm 53.3mm
New
RS Stock No. 197-7180
Mfr. Part No.ISO122P
SGD49.10
Each
units
Single ±15V - 140dB - - - - PDIP 8 - - - -
RS Stock No. 768-7907
Mfr. Part No.ACPL-C87B-000E
BrandBroadcom
SGD10.64
Each
units
Single - 4.5 → 5.5 V -78dB - 1 1.005V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 922-6762
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
SGD6.78
Each (In a Tube of 80)
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. 910-8257
Mfr. Part No.ACPL-798J-000E
BrandBroadcom
SGD9.57
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. 795-1472
Mfr. Part No.Si8261BAA-C-IS
SGD2.11
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. 146-4417
Mfr. Part No.ACNT-H511-000E
BrandBroadcom
SGD8.48
Each (In a Pack of 2)
units
Single - Maximum of 24 V - - 1 - Surface Mount SO8 8 13.6 x 6.24 x 3.6mm 3.6mm 6.24mm 13.6mm
RS Stock No. 795-1453
Mfr. Part No.Si8261ACA-C-IS
SGD1.81
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. 830-4984
Mfr. Part No.ACPL-790B-300E
BrandBroadcom
SGD10.70
Each
units
Single - 3 → 5.5 V - - 1 8.24V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS Stock No. 714-0206
Mfr. Part No.ACPL-C79B-000E
BrandBroadcom
SGD12.40
Each
units
Single - 4.5 → 5.5 V - - 2 8.24V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 796-8745
Mfr. Part No.ADUM3190TRQZ
SGD4.72
Each (In a Pack of 7)
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. 178-3171
Mfr. Part No.ACPL-790A-000E
BrandBroadcom
SGD8.15
Each (In a Tube of 50)
units
Single - 3 → 5.5 V - - 1 8.28V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS Stock No. 693-5965
Mfr. Part No.ACPL-C784-000E
BrandBroadcom
SGD8.86
Each
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. 178-3173
Mfr. Part No.ACPL-782T-300E
BrandBroadcom
SGD15.21
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 786-3151
Mfr. Part No.ADUM3190ARQZ
SGD3.96
Each (In a Pack of 2)
units
Single - 3 → 20 V - - 2 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 159-9277
Mfr. Part No.ADUM4190BRIZ
SGD4.474
Each (In a Tube of 37)
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
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