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. 121-8271
Mfr. Part No.ISO122U
TWD890.60
Each (In a Tube of 20)
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. 169-6523
Mfr. Part No.AD210JN
TWD3,562.00
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. 922-6719
Mfr. Part No.ACPL-C790-000E
BrandBroadcom
TWD172.80
Each (In a Tube of 80)
units
Single - 3 → 5.5 V - - 1 8.44V/V Surface Mount SOIC 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 178-3187
Mfr. Part No.HCPL-7510-300E
BrandBroadcom
TWD158.90
Each (In a Tube of 50)
units
Single - 4.5 → 5.5 V - - 1 4/0.512V/V Through Hole PDIP 8 9.8 x 6.35 x 3.56mm 3.56mm 6.35mm 9.8mm
RS Stock No. 197-7179
Mfr. Part No.ISO122P
TWD961.10
Each (In a Tube of 25)
units
Single ±15V - 140dB - - - - PDIP 8 - - - -
RS Stock No. 159-9273
Mfr. Part No.ADUM3190ARQZ
TWD70.20
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. 830-4984
Mfr. Part No.ACPL-790B-300E
BrandBroadcom
TWD229.00
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. 231-5196
Mfr. Part No.AD215AY
TWD2,730.00
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. 450-862
Mfr. Part No.HCPL-788J-000E
BrandBroadcom
TWD251.00
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. 693-5961
Mfr. Part No.ACPL-C780-000E
BrandBroadcom
TWD279.00
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. 796-8742
Mfr. Part No.ADUM4190TRIZ
TWD122.60
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. 922-6513
Mfr. Part No.ACPL-C87BT-000E
BrandBroadcom
TWD311.80
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. 174-4179
Mfr. Part No.HCPL-7800A-500E
BrandBroadcom
TWD371.00
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. 796-8736
Mfr. Part No.ADUM3190SRQZ
TWD97.90
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. 178-3215
Mfr. Part No.ACNT-H790-000E
BrandBroadcom
TWD247.60
Each (In a Tube of 80)
units
Single - 3 → 5.5 (VDD2) V, 4.5 → 5.5 (VDD1) V - - - 8.42V/V Surface Mount SOIC 8 13.6 x 6.24 x 3.4mm 3.4mm 6.24mm 13.6mm
RS Stock No. 178-3179
Mfr. Part No.ACPL-782T-000E
BrandBroadcom
TWD323.60
Each (In a Tube of 50)
units
- - - - - - - Through Hole DIP - - - - -
RS Stock No. 714-0203
Mfr. Part No.ACPL-C78A-060E
BrandBroadcom
TWD395.00
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. 159-9274
Mfr. Part No.ADUM4190ARIZ
TWD84.80
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. 786-3151
Mfr. Part No.ADUM3190ARQZ
TWD88.50
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. 796-8748
Mfr. Part No.ADUM4190SRIZ
TWD111.80
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