Dual comparator with a built-in voltage reference
The MAX933ESA+T from Maxim Integrated packs two comparators and a precision voltage reference into a single 8-SOIC. The internal reference eliminates an external reference IC and its associated bypass caps, saving board space on dense mixed-signal PCBs. It targets threshold-detection applications—battery undervoltage lockout, overcurrent trip, window comparators—where the 50 mV hysteresis prevents chatter at the switching edge. Quiescent current maxes at 6 µA, making this part a fit for portable or loop-powered designs where every microamp is budgeted. The CMOS/TTL output stage drives logic inputs directly; no external pull-up resistor needed for CMOS rails. Supply range spans 2.5 V to 11 V single, or ±1.25 V to ±5.5 V dual. The 12 µs propagation delay is adequate for slow-changing analog signals like temperature or pressure transducer outputs.
What the ratings mean for the BOM
The 50 mV hysteresis is set internally—no external resistors for positive feedback. The 10 mV max input offset at 5 V is the threshold accuracy at the comparator input. 80 dB CMRR and 80 dB PSRR are typical figures—adequate for rejecting supply ripple and common-mode noise in a 12-bit signal chain. If the input common-mode range is exceeded, the output state is undefined; stay within the supply rails. Output current is specified at 0.015 mA typical at 5 V—this is a logic-level output, not a driver. Do not expect it to sink a relay coil or LED directly; buffer with a transistor or a logic gate.
Lifecycle and supply posture
The MAX933ESA+T carries an active lifecycle status and is ROHS3 compliant. There is no last-time-buy notice or NRND flag. Sourced through independent distribution, the part is quoted to order against an RFQ; availability and current pricing are confirmed at quote time.