What the ratings mean for your BOM
The 4 mV hysteresis is built in — no external resistor divider needed for clean switching at slow edges. Propagation delay is 8 µs typical, so this is not a high-speed comparator for switching regulators or fast overcurrent detection; it is sized for level sensing, window comparators, and wake-up circuits where response time in microseconds is acceptable. Input bias current is 0.08 µA max at 5 V, which lets you use high-value resistor dividers without offset error. Output sink/source is 50 mA at 5 V, enough to drive a logic input or a small LED directly.
Lifecycle and sourcing
The MAX9021AXK is listed as Active with no last-time-buy or obsolescence notice. RoHS status is non-compliant, so verify your assembly line's exemption or lead-free policy before specifying. Sourced and quoted to order through independent distribution; availability and current pricing confirmed at quote time against an RFQ.