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. 450-868
Mfr. Part No.HCPL-7800-300E
BrandBroadcom
£7.17
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. 169-6523
Mfr. Part No.AD210JN
£90.77
Each
Units
Single - 15 V 120dB - 1 40dB Through Hole PDIP 12 8.91 x 53.3 x 25.4mm 8.91mm 25.4mm 53.3mm
RS Stock No. 127-0272
Mfr. Part No.AD202JN
£63.43
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
£63.482
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. 450-862
Mfr. Part No.HCPL-788J-000E
BrandBroadcom
£5.85
Each
Units
Dual 5V - 140dB - 1 - Surface Mount SOIC 16 3.51 x 10.31 x 7.49mm 3.51mm 7.49mm 10.31mm
RS Stock No. 922-5652
Mfr. Part No.HCPL-788J-000E
BrandBroadcom
£4.969
Each (In a Tube of 45)
Units
Dual 5V - 140dB - 1 - Surface Mount SOIC 16 3.51 x 10.31 x 7.49mm 3.51mm 7.49mm 10.31mm
RS Stock No. 461-8267
Mfr. Part No.ISO122JP
£20.41
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. 121-8550
Mfr. Part No.ISO122JP
£18.034
Each (In a Tube of 25)
Units
- - - - - - - - - - - - - -
RS Stock No. 369-5774
Mfr. Part No.AD202JY
£62.841
Each (In a Tube of 9)
Units
Single - 15 V 130dB - 1 40dB Through Hole SIP 11 15.9 x 52.8 x 6.6mm 15.9mm 6.6mm 52.8mm
RS Stock No. 106-7018
Mfr. Part No.AD202JY
£62.83
Each (In a Tube of 9)
Units
Single - 15 V 130dB - 1 40dB Through Hole SIP 11 15.9 x 52.8 x 6.6mm 15.9mm 6.6mm 52.8mm
RS Stock No. 922-6762
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
£3.42
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. 768-7893
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
£4.12
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. 714-0206
Mfr. Part No.ACPL-C79B-000E
BrandBroadcom
£6.40
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. 178-3209
Mfr. Part No.ACPL-C79B-000E
BrandBroadcom
£5.30
Each (In a Tube of 80)
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. 178-3213
Mfr. Part No.ACPL-C87AT-000E
BrandBroadcom
£6.537
Each (In a Tube of 80)
Units
Single - 3 → 5.5 V - - 1 1.01V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 830-4987
Mfr. Part No.ACPL-C87AT-000E
BrandBroadcom
£7.50
Each
Units
Single - 3 → 5.5 V - - 1 1.01V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 734-4988
Mfr. Part No.ACPL-7900-000E
BrandBroadcom
£4.12
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
£2.399
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. 825-3164
Mfr. Part No.AMC1200SDUBR
£3.62
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. 921-3000
Mfr. Part No.AMC1200SDUBR
£2.546
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