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. 450-903
Mfr. Part No.HCPL-7800A-300E
BrandBroadcom
TWD402.00
Each
units
Single - 5 V 76dB - 1 18.14dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 922-5665
Mfr. Part No.HCPL-7800A-300E
BrandBroadcom
TWD350.90
Each (In a Tube of 50)
units
Single - 5 V 76dB - 1 18.14dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 734-4988
Mfr. Part No.ACPL-7900-000E
BrandBroadcom
TWD185.00
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. 922-6731
Mfr. Part No.ACPL-7900-000E
BrandBroadcom
TWD157.10
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. 121-8514
Mfr. Part No.ISO124U
TWD612.00
Each (In a Tube of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 300-8259
Mfr. Part No.ISO124U
TWD708.00
Each
units
Dual ±12 V, ±15 V, ±5 V, ±9 V - - - 1 0dB Surface Mount SOP 8 2.3 x 17.9 x 7.5mm 2.3mm 7.5mm 17.9mm
RS Stock No. 817-5786
Mfr. Part No.AMC1100DUB
TWD195.00
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
TWD166.20
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. 451-007
Mfr. Part No.HCPL-7800A-000E
BrandBroadcom
TWD401.00
Each
units
Single - 5 V 76dB - 1 18.14dB Through Hole PDIP 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 922-5687
Mfr. Part No.HCPL-7800A-000E
BrandBroadcom
TWD349.50
Each (In a Tube of 50)
units
Single - 5 V 76dB - 1 18.14dB Through Hole PDIP 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 127-0272
Mfr. Part No.AD202JN
TWD2,719.00
Each
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
RS Stock No. 106-7013
Mfr. Part No.AD202JN
TWD2,669.80
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
RS Stock No. 922-5674
Mfr. Part No.HCPL-7840-300E
BrandBroadcom
TWD194.10
Each (In a Tube of 50)
units
Single - 5 V 76.1dB - 1 18.49dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 450-907
Mfr. Part No.HCPL-7840-300E
BrandBroadcom
TWD229.00
Each
units
Single - 5 V 76.1dB - 1 18.49dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 922-6510
Mfr. Part No.ACPL-7900-300E
BrandBroadcom
TWD158.90
Each (In a Tube of 50)
units
Single - 3 → 5.5 V - - 1 8.44V/V Surface Mount PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS Stock No. 768-7907
Mfr. Part No.ACPL-C87B-000E
BrandBroadcom
TWD246.00
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. 922-5655
Mfr. Part No.HCPL-7800-300E
BrandBroadcom
TWD280.70
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. 914-0090
Mfr. Part No.AD215BY
TWD3,291.00
Each
units
Dual ±15V - 120dB - 1 - Through Hole SIP 12 63 x 8.3 x 21.4mm 21.4mm 8.3mm 63mm
RS Stock No. 922-6769
Mfr. Part No.ACPL-C87B-000E
BrandBroadcom
TWD214.70
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. 461-8267
Mfr. Part No.ISO122JP
TWD743.00
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