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. 450-862
Mfr. Part No.HCPL-788J-000E
BrandBroadcom
R 129.76
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. 178-3131
Mfr. Part No.ACPL-785J-000E
BrandBroadcom
R 97.11
Each (In a Tube of 45)
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
RS stock no. 178-3216
Mfr. Part No.ACNT-H79A-000E
BrandBroadcom
R 161.534
Each (In a Tube of 80)
units
Single - 3 → 5.5 (VDD2) V, 4.5 → 5.5 (VDD1) V - - - 8.26V/V Surface Mount SOIC 8 13.6 x 6.24 x 3.4mm 3.4mm 6.24mm 13.6mm
RS stock no. 714-0206
Mfr. Part No.ACPL-C79B-000E
BrandBroadcom
R 142.47
Each
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. 197-7180
Mfr. Part No.ISO122P
R 550.07
Each
units
Single ±15V - 140dB - - - - PDIP 8 - - - -
RS stock no. 910-8226
Mfr. Part No.ACNT-H790-000E
BrandBroadcom
R 150.99
Each
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. 146-6124
Mfr. Part No.ACNT-H870-000E
BrandBroadcom
R 127.293
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. 300-8259
Mfr. Part No.ISO124U
R 366.40
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
RS stock no. 369-5819
Mfr. Part No.AD210JN
R 1,907.113
Each (In a Tube of 9)
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. 146-6143
Mfr. Part No.ACNT-H870-000E
BrandBroadcom
R 152.93
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. 714-0209
Mfr. Part No.ACPL-C79A-000E
BrandBroadcom
R 113.93
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. 127-0272
Mfr. Part No.AD202JN
R 1,409.91
Each
units
Single - 15 V 130dB - 1 40dB Through Hole PDIP 11 8.9 x 53.3 x 17.8mm 8.9mm 17.8mm 53.3mm
RS stock no. 786-3151
Mfr. Part No.ADUM3190ARQZ
R 47.605
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. 168-9955
Mfr. Part No.SI8261BAA-C-IS
R 20.612
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. 714-0203
Mfr. Part No.ACPL-C78A-060E
BrandBroadcom
R 103.79
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. 758-9579
Mfr. Part No.AD204KN
R 1,444.01
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. 169-6523
Mfr. Part No.AD210JN
R 2,012.80
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. 178-3206
Mfr. Part No.ACPL-C784-000E
BrandBroadcom
R 81.957
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. 145-7698
Mfr. Part No.ADUM4190SRIZ
R 50.687
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. 106-7017
Mfr. Part No.AD215AY
R 1,462.124
Each (In a Tube of 8)
units
Dual ±15V - - - 1 20dB Through Hole SIP 12 21.4 x 63 x 8.3mm 21.4mm 8.3mm 63mm