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. 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. 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. 734-4931
Mfr. Part No.ACPL-C790-000E
BrandBroadcom
$8.91
Each
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. 693-5974
Mfr. Part No.ACPL-C78A-000E
BrandBroadcom
$17.26
Each
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. 914-0090
Mfr. Part No.AD215BY
$152.08
Each
units
Dual ±15V - 120dB - 1 - Through Hole SIP 12 63 x 8.3 x 21.4mm 21.4mm 8.3mm 63mm
RS Stock No. 693-5965
Mfr. Part No.ACPL-C784-000E
BrandBroadcom
$8.99
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. 178-3206
Mfr. Part No.ACPL-C784-000E
BrandBroadcom
$7.84
Each (In a Tube of 80)
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. 178-3209
Mfr. Part No.ACPL-C79B-000E
BrandBroadcom
$10.98
Each (In a Tube of 80)
units
Single - 4.5 → 5.5 V - - 2 8.24V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 178-3139
Mfr. Part No.ACPL-798J-000E
BrandBroadcom
$8.47
Each (In a Tube of 45)
units
Single - 3 → 5.5 (VDD2) V, 4.5 → 5.5 (VDD1) V - - - - Surface Mount SOIC 16 10.31 x 7.49 x 3.5mm 3.5mm 7.49mm 10.31mm
RS Stock No. 145-7087
Mfr. Part No.AD204JY
$115.93
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. 922-5674
Mfr. Part No.HCPL-7840-300E
BrandBroadcom
$8.78
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. 145-7698
Mfr. Part No.ADUM4190SRIZ
$4.07
Each (In a Tube of 37)
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. 922-6633
Mfr. Part No.ACPL-C78A-000E
BrandBroadcom
$15.04
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. 183-1878
Mfr. Part No.AD210BN
$228.07
Each
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. 146-6124
Mfr. Part No.ACNT-H870-000E
BrandBroadcom
$11.13
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. 714-0209
Mfr. Part No.ACPL-C79A-000E
BrandBroadcom
$10.40
Each
units
Single - 4.5 → 5.5 V - - 2 8.28V/V Surface Mount SSOP 8 5.85 x 6.807 x 3.18mm 3.18mm 6.807mm 5.85mm
RS Stock No. 169-6523
Mfr. Part No.AD210JN
$180.63
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. 168-9955
Mfr. Part No.SI8261BAA-C-IS
$1.90
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. 174-3675
Mfr. Part No.HCPL-7800A-500E
BrandBroadcom
$12.392
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. 734-4966
Mfr. Part No.ACPL-785J-000E
BrandBroadcom
$9.34
Each
units
Single - 4.5 → 5.5 V - - - - Surface Mount SOIC 16 10.312 x 7.493 x 3.505mm 3.505mm 7.493mm 10.31mm
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