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Hi
Could you help suggest suitable products
bidirectional single channel buffer
Vin max: 5.5V IOL: 40mA max.
Buffers cannot be bidirectional without a separate direction signal. Such a device is called a transceiver.
Single-channel transceivers like the SN74LXC1T45 cannot do 40 mA. You'd have to use multiple channels in parallel, e.g., SN74LV245A or SN74AHC245.