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ISO7220/21A vs ISO7420/21

Other Parts Discussed in Thread: ISO7420


When I'm looking  into datasheet for ISO7220/21A and compare it with data from ISO7420/21 I'm not understand where ISO722x have benefit compare with ISO742x.

Both have the same datarate 1Mbps and same package with pin-to pin  compatibility. But that's all. Another parameters such as switching parameters, current consumptions and insulation characteristics are always better for ISO724x.

Taking into account that both have the same price on (1.05 | 1ku) could somebody point out where ISO722xA will give benefit?