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. 288-777
Mfr. Part No.ISO122U
$50.19
Each
units
Dual ±12 V, ±15 V, ±5 V, ±9 V - - - 1 0dB Surface Mount SOIC 28 2.3 x 17.9 x 7.5mm 2.3mm 7.5mm 17.9mm
RS Stock No. 922-6510
Mfr. Part No.ACPL-7900-300E
BrandBroadcom
$6.96
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. 830-4984
Mfr. Part No.ACPL-790B-300E
BrandBroadcom
$10.85
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. 178-3192
Mfr. Part No.ACPL-790B-300E
BrandBroadcom
$9.48
Each (In a Tube of 50)
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. 178-3179
Mfr. Part No.ACPL-782T-000E
BrandBroadcom
$15.36
Each (In a Tube of 50)
units
- - - - - - - Through Hole DIP - - - - -
RS Stock No. 830-4971
Mfr. Part No.ACPL-7900-300E
BrandBroadcom
$8.19
Each (In a Pack of 2)
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. 461-8267
Mfr. Part No.ISO122JP
$43.71
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
$32.834
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 734-4934
Mfr. Part No.HCPL-7510-000E
BrandBroadcom
$8.10
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. 714-0203
Mfr. Part No.ACPL-C78A-060E
BrandBroadcom
$17.31
Each
units
Single - 4.5 → 5.5 V - - 2 8.08V/V Surface Mount SSOP 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
$15.10
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. 709-2324
Mfr. Part No.ISO122JU
$41.54
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. 145-7696
Mfr. Part No.ADUM3190BRQZ
$3.32
Each (In a Tube of 98)
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. 758-9579
Mfr. Part No.AD204KN
$144.84
Each
units
- - - 110dB - 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. 231-5196
Mfr. Part No.AD215AY
$137.21
Each
units
Dual ±15V - - - 1 20dB Through Hole SIP 12 21.4 x 63 x 8.3mm 21.4mm 8.3mm 63mm
RS Stock No. 796-8742
Mfr. Part No.ADUM4190TRIZ
$5.73
Each (In a Pack of 5)
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. 159-9277
Mfr. Part No.ADUM4190BRIZ
$4.512
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
RS Stock No. 693-5961
Mfr. Part No.ACPL-C780-000E
BrandBroadcom
$12.23
Each
units
Single - 5 V 76dB - 1 18.32dB Surface Mount SOIC 8 3.18 x 5.85 x 6.81mm 3.18mm 6.81mm 5.85mm
RS Stock No. 178-3213
Mfr. Part No.ACPL-C87AT-000E
BrandBroadcom
$13.16
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. 106-7018
Mfr. Part No.AD202JY
$217.191
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
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