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. 922-5674
Mfr. Part No.HCPL-7840-300E
BrandBroadcom
MYR22.74
Each (In a Tube of 50)
units
Single - 5 V 76.1dB - 1 18.49dB Surface Mount PDIP SMD 8 3.56 x 9.8 x 6.35mm 3.56mm 6.35mm 9.8mm
RS Stock No. 121-8271
Mfr. Part No.ISO122U
MYR117.696
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. 178-3192
Mfr. Part No.ACPL-790B-300E
BrandBroadcom
MYR25.36
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. 768-7893
Mfr. Part No.ACPL-C870-000E
BrandBroadcom
MYR21.68
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. 145-6786
Mfr. Part No.AD204KN
MYR302.459
Each (In a Tube of 9)
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. 145-7087
Mfr. Part No.AD204JY
MYR260.689
Each (In a Tube of 9)
units
- - - 130dB - 1 40dB Through Hole SIP 11 15.9 x 52.8 x 6.3mm 15.9mm 6.3mm 52.8mm
RS Stock No. 169-6523
Mfr. Part No.AD210JN
MYR431.99
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. 183-1683
Mfr. Part No.AD210BN
MYR544.32
Each (In a Tube of 9)
units
Single - 15 V 120dB - 1 100V/V Through Hole PDIP 12 53.3 x 25.4 x 8.91mm 8.91mm 25.4mm 53.3mm
RS Stock No. 768-7897
Mfr. Part No.ACPL-C87A-000E
BrandBroadcom
MYR23.69
Each
units
Single - 4.5 → 5.5 V -78dB - 1 1.01V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 263-481
Mfr. Part No.ISO120G
MYR925.85
Each
units
Dual ±12 V, ±15 V, ±5 V, ±9 V - - - 1 0dB Through Hole SBCDIP 16 2.86 x 30.48 x 7.37mm 2.86mm 7.37mm 30.48mm
RS Stock No. 121-8263
Mfr. Part No.ISO122P
MYR109.497
Each (In a Tube of 25)
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. 922-6765
Mfr. Part No.ACPL-C87A-000E
BrandBroadcom
MYR20.003
Each (In a Tube of 80)
units
Single - 4.5 → 5.5 V -78dB - 1 1.01V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 912-9787
Mfr. Part No.AD202KY
MYR321.68
Each (In a Tube of 9)
units
Single - 15 V 105dB - 2 1 → 100V/V Through Hole SIP 10 52.8 x 6.6 x 15.9mm 15.9mm 6.6mm 52.8mm
RS Stock No. 796-8742
Mfr. Part No.ADUM4190TRIZ
MYR14.36
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. 786-3167
Mfr. Part No.ADUM4190BRIZ
MYR13.31
Each (In a Pack of 2)
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. 178-3208
Mfr. Part No.ACPL-C78A-060E
BrandBroadcom
MYR40.41
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. 146-4417
Mfr. Part No.ACNT-H511-000E
BrandBroadcom
MYR17.12
Each (In a Pack of 2)
units
Single - Maximum of 24 V - - 1 - Surface Mount SO8 8 13.6 x 6.24 x 3.6mm 3.6mm 6.24mm 13.6mm
RS Stock No. 168-9955
Mfr. Part No.SI8261BAA-C-IS
MYR5.07
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. 693-5965
Mfr. Part No.ACPL-C784-000E
BrandBroadcom
MYR24.05
Each
units
Single - 5 V 76dB - 1 18.49dB Surface Mount SSOP 8 3.18 x 5.85 x 6.81mm 3.18mm 6.81mm 5.85mm
RS Stock No. 231-5196
Mfr. Part No.AD215AY
MYR540.83
Each
units
Dual ±15V - - - 1 20dB Through Hole SIP 12 21.4 x 63 x 8.3mm 21.4mm 8.3mm 63mm
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