The PCAL9535AHF,128 from NXP USA Inc. is an I/O expander (16) that operates on I2C at 400 kHz, in a 24-HWQFN (4x4) package.
The PCAL9535APW,118 from NXP USA Inc. is an I/O expander Integrated Circuit with 16 I/O, I2C and SMBus interface at 400 kHz, in a 24-TSSOP package.
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