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. 922-5687
Mfr. Part No.HCPL-7800A-000E
BrandBroadcom
$14.599
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. 451-007
Mfr. Part No.HCPL-7800A-000E
BrandBroadcom
$16.82
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. 817-5789
Mfr. Part No.AMC1200SDUB
$8.14
Each
units
Dual 5V - - - 1 8 Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS Stock No. 121-9702
Mfr. Part No.AMC1200SDUB
$6.973
Each (In a Tube of 50)
units
Dual 5V - - - 1 8 Surface Mount SOP 8 9.55 x 6.67 x 3.35mm 3.35mm 6.67mm 9.55mm
RS Stock No. 825-3164
Mfr. Part No.AMC1200SDUBR
$8.025
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
$5.539
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
RS Stock No. 830-4981
Mfr. Part No.ACPL-C87BT-000E
BrandBroadcom
$16.13
Each
units
Single - 3 → 5.5 V - - 1 1.005V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 922-6513
Mfr. Part No.ACPL-C87BT-000E
BrandBroadcom
$11.907
Each (In a Tube of 80)
units
Single - 3 → 5.5 V - - 1 1.005V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 178-3171
Mfr. Part No.ACPL-790A-000E
BrandBroadcom
$7.93
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. 734-4981
Mfr. Part No.ACPL-790A-000E
BrandBroadcom
$8.87
Each
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. 740-5279
Mfr. Part No.NJM2505AF-TE1
$1.10
Each (In a Pack of 5)
units
Single - 4.5 → 9 V - - 1 1dB Surface Mount SOT-23 5 2.9 x 1.6 x 1.1mm 1.1mm 1.6mm 2.9mm
RS Stock No. 786-3151
Mfr. Part No.ADUM3190ARQZ
$3.625
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. 796-8789
Mfr. Part No.AD210AN
$144.03
Each
units
Dual ±15V - 120dB - 1 100V/V Through Hole PDIP 12 53.3 x 25 x 8.91mm 8.91mm 25mm 53.3mm
RS Stock No. 866-0215
Mfr. Part No.ISO124P
$23.60
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. 300-8243
Mfr. Part No.ISO124P
$29.02
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. 159-9273
Mfr. Part No.ADUM3190ARQZ
$2.742
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. 912-9983
Mfr. Part No.AD210AN
$130.69
Each (In a Tube of 9)
units
Dual ±15V - 120dB - 1 100V/V Through Hole PDIP 12 53.3 x 25 x 8.91mm 8.91mm 25mm 53.3mm
RS Stock No. 168-9952
Mfr. Part No.SI8261ACA-C-IS
$1.478
Each (In a Tube of 96)
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. 795-1453
Mfr. Part No.Si8261ACA-C-IS
$1.54
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. 300-8259
Mfr. Part No.ISO124U
$20.00
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
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