Analog Devices Inc./Maxim Integrated MAX933CSA-T

Overview

MAX933CSA-T from Maxim Integrated is a dual micropower voltage comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible outputs that source up to 40mA and sink ≥5mA, and operation from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply). It targets battery-powered threshold detection and window comparator circuits requiring ultra-low quiescent current (≤4µA over temperature) and rail-to-rail input range down to V−.

For engineers reviewing the MAX933CSA-T datasheet, MAX933CSA-T pinout, MAX933CSA-T application, or MAX933CSA-T equivalent, key selection criteria include its dual-comparator architecture with shared internal reference, HYST-pin-based hysteresis programming without external feedback, output swing from V+ to V− (requiring V− connection to GND for single-supply TTL compatibility), and guaranteed performance across 0°C to +70°C.

Technical Context

The MAX933CSA-T implements two independent comparators sharing a single precision 1.182V reference and a dedicated HYST terminal for adjustable hysteresis. Its input common-mode range extends from V− to (V+ − 1.3V), enabling direct sensing near ground in single-supply systems. The output stage eliminates crowbar current during transitions, suppressing supply-induced parasitic feedback.

Unlike the MAX934 (quad) or MAX932 (dual with INB+ only), the MAX933CSA-T features complementary inputs on both comparators: INA+ and INA− for comparator A; INB− and INB+ for comparator B - enabling flexible window detector topologies. It is pin-compatible with the 1% reference MAX923 but not with MAX932 or MAX922.

Key Specifications

Pinout & Package

MAX933CSA-T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, body size 3.9mm × 4.9mm, 1.75mm height, lead pitch 1.27mm. RoHS-compliant, Pb-free, rated for 0°C to +70°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-comparator-with-reference applications.

Compared with MAX923CSA-T, the MAX933CSA-T trades reference accuracy for cost and availability, while retaining identical hysteresis implementation and output drive. Versus TLV3702IDR, it integrates reference and HYST control but consumes higher quiescent current - making it optimal for mid-power, component-count-sensitive designs.

Availability

MAX933CSA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for MAX933CSA-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, computing, and consumer applications.

The MAX931–MAX934 family was designed for ultra-low-power, cost-sensitive sensing and monitoring applications where micropower operation, integrated reference, and simple hysteresis control are essential - particularly in portable and energy-harvesting systems.

FAQ

What is the operating temperature range for MAX933CSA-T?

The MAX933CSA-T is specified for 0°C to +70°C ambient operation, as indicated by the 'C' suffix in the part number. This commercial-grade rating applies to the SO package variant and ensures guaranteed performance including reference accuracy (±2%), propagation delay (12µs typ), and supply current (≤4µA) across that range. For extended temperature operation, the MAX933ESA-T (-40°C to +85°C) is available in SO package.

How does the HYST pin function on MAX933CSA-T?

The HYST pin on MAX933CSA-T accepts a voltage between REF − 50mV and REF to program hysteresis. Connecting R1 from REF to HYST and R2 from HYST to V− sets a hysteresis band (VHB) ≈ 2 × (REF − VHYST), enabling 0–100mV adjustment. This eliminates external positive-feedback networks and maintains low quiescent current - a key differentiator versus discrete hysteresis implementations.

Can MAX933CSA-T operate from a 3V single supply?

Yes, MAX933CSA-T operates from +2.5V to +11V single supply, fully supporting 3V systems. At 3V, supply current remains ≤4µA, input common-mode range extends from V− (GND) to V+ − 1.3V (1.7V), and propagation delay increases to 14µs (typ) at 10mV overdrive. Reference output remains stable at 1.182V ±2%, enabling accurate threshold generation even at minimum supply.

Is MAX933CSA-T pin-compatible with any other Maxim comparators?

Yes, MAX933CSA-T is pin-compatible with the MAX923CSA-T (1% reference) and shares identical pinout, package, and electrical interface. It is not pin-compatible with MAX932 or MAX922 due to differing input configurations (MAX932 has INB+ only; MAX933 has both INB+ and INB−). This allows drop-in replacement with MAX923CSA-T when higher reference accuracy is required.

What is the maximum continuous output source current of MAX933CSA-T?

MAX933CSA-T delivers ≥40mA continuous source current per output (OUTA or OUTB) into loads referenced to V−, verified across temperature and supply voltage. This enables direct driving of LEDs, small solenoids, or logic inputs without external buffers. Short-pulse current can reach 100mA at V+ = 5V, provided package power dissipation limits (471mW at TA = +70°C for SO package) are not exceeded.