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. 817-5786
Mfr. Part No.AMC1100DUB
R 82.15
Each
units
Dual 5V - 108dB - 1 - Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS stock no. 121-9701
Mfr. Part No.AMC1100DUB
R 72.103
Each (In a Tube of 50)
units
Dual 5V - 108dB - 1 - Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS stock no. 866-0215
Mfr. Part No.ISO124P
R 257.71
Each (In a Tube of 25)
units
Dual ±4.5 → ±18V - 140dB - 1 - Through Hole PDIP 8 21.34 x 7.11 x 4.95mm 4.95mm 7.11mm 21.34mm
RS stock no. 922-5655
Mfr. Part No.HCPL-7800-300E
BrandBroadcom
R 114.021
Each (In a Tube of 50)
units
Single - 5 V 76dB - 1 18.31dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS stock no. 450-868
Mfr. Part No.HCPL-7800-300E
BrandBroadcom
R 167.27
Each
units
Single - 5 V 76dB - 1 18.31dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS stock no. 300-8243
Mfr. Part No.ISO124P
R 319.70
Each
units
Dual ±12 V, ±15 V, ±5 V, ±9 V - - - 1 0dB Through Hole PDIP 8 3.94 x 20.01 x 6.61mm 3.94mm 6.61mm 20.01mm
RS stock no. 922-6731
Mfr. Part No.ACPL-7900-000E
BrandBroadcom
R 63.762
Each (In a Tube of 50)
units
Single - 3 → 5.5 V - - 1 8.44V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS stock no. 734-4988
Mfr. Part No.ACPL-7900-000E
BrandBroadcom
R 75.74
Each
units
Single - 3 → 5.5 V - - 1 8.44V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS stock no. 818-8357
Mfr. Part No.HCPL-7510-300E
BrandBroadcom
R 76.05
Each (In a Pack of 2)
units
Single - 4.5 → 5.5 V - - 1 4/0.512V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS stock no. 178-3187
Mfr. Part No.HCPL-7510-300E
BrandBroadcom
R 64.504
Each (In a Tube of 50)
units
Single - 4.5 → 5.5 V - - 1 4/0.512V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS stock no. 768-7893
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
R 93.55
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. 922-6762
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
R 57.467
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. 759-2187
Mfr. Part No.AD202KN
R 1,987.53
Each
units
Single - 15 V 105dB - 2 1 → 100V/V Through Hole PDIP 10 53.3 x 17.8 x 8.52mm 8.52mm 17.8mm 53.3mm
RS stock no. 796-8736
Mfr. Part No.ADUM3190SRQZ
R 39.923
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. 159-9303
Mfr. Part No.ADUM3190SRQZ
R 31.511
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. 922-6728
Mfr. Part No.HCPL-7510-000E
BrandBroadcom
R 60.456
Each (In a Tube of 50)
units
Single 5.5V 4.5 → 5.5 V - - 1 - Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS stock no. 922-6769
Mfr. Part No.ACPL-C87B-000E
BrandBroadcom
R 87.214
Each (In a Tube of 80)
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. 768-7897
Mfr. Part No.ACPL-C87A-000E
BrandBroadcom
R 90.45
Each
units
Single - 4.5 → 5.5 V -78dB - 1 1.01V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS stock no. 734-4934
Mfr. Part No.HCPL-7510-000E
BrandBroadcom
R 75.55
Each
units
Single 5.5V 4.5 → 5.5 V - - 1 - Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS stock no. 922-6765
Mfr. Part No.ACPL-C87A-000E
BrandBroadcom
R 76.661
Each (In a Tube of 80)
units
Single - 4.5 → 5.5 V -78dB - 1 1.01V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm