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. 795-1472
Mfr. Part No.Si8261BAA-C-IS
£1.07
Each (In a Pack of 5)
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. 178-3208
Mfr. Part No.ACPL-C78A-060E
BrandBroadcom
£4.523
Each (In a Tube of 80)
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. 796-8736
Mfr. Part No.ADUM3190SRQZ
£2.176
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. 796-8748
Mfr. Part No.ADUM4190SRIZ
£2.704
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. 714-0203
Mfr. Part No.ACPL-C78A-060E
BrandBroadcom
£4.66
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. 168-9955
Mfr. Part No.SI8261BAA-C-IS
£0.945
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. 818-8262
Mfr. Part No.ACPL-782T-000E
BrandBroadcom
£8.74
Each
Units
- - - - - - - Through Hole - - - - - -
RS Stock No. 758-9579
Mfr. Part No.AD204KN
£65.13
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. 817-5786
Mfr. Part No.AMC1100DUB
£4.14
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. 178-3179
Mfr. Part No.ACPL-782T-000E
BrandBroadcom
£7.624
Each (In a Tube of 50)
Units
- - - - - - - Through Hole DIP - - - - -
RS Stock No. 121-9701
Mfr. Part No.AMC1100DUB
£3.499
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. 146-6124
Mfr. Part No.ACNT-H870-000E
BrandBroadcom
£5.661
Each (In a Tube of 80)
Units
Single - 4.5 → 5.5 V - - 2 1.01 Surface Mount SO 8 13.6 x 6.24 x 3.6mm 3.6mm 6.24mm 13.6mm
RS Stock No. 174-4179
Mfr. Part No.HCPL-7800A-500E
BrandBroadcom
£7.99
Each
Units
Single - Maximum of 5.5 V 76dB - 1 8.08V/V Surface Mount DIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS Stock No. 146-6143
Mfr. Part No.ACNT-H870-000E
BrandBroadcom
£6.49
Each
Units
Single - 4.5 → 5.5 V - - 2 1.01 Surface Mount SO 8 13.6 x 6.24 x 3.6mm 3.6mm 6.24mm 13.6mm
RS Stock No. 174-3675
Mfr. Part No.HCPL-7800A-500E
BrandBroadcom
£5.08
Each (On a Reel of 1000)
Units
Single - Maximum of 5.5 V 76dB - 1 8.08V/V Surface Mount DIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS Stock No. 197-7179
Mfr. Part No.ISO122P
£21.91
Each (In a Tube of 25)
Units
Single ±15V - 140dB - - - - PDIP 8 - - - -
RS Stock No. 693-5961
Mfr. Part No.ACPL-C780-000E
BrandBroadcom
£5.97
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. 922-6624
Mfr. Part No.ACPL-C780-000E
BrandBroadcom
£6.15
Each (In a Tube of 80)
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. 922-6633
Mfr. Part No.ACPL-C78A-000E
BrandBroadcom
£6.831
Each (In a Tube of 80)
Units
Single - 5 V 76dB - 1 18.15dB Surface Mount SOIC 8 3.18 x 5.85 x 6.81mm 3.18mm 6.81mm 5.85mm
RS Stock No. 197-7180
Mfr. Part No.ISO122P
£24.88
Each
Units
Single ±15V - 140dB - - - - PDIP 8 - - - -
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