Analog Devices Inc./Maxim Integrated MAX921CSA-TG05

Overview

MAX921CSA-TG05 from Maxim Integrated is a single, micropower, low-voltage comparator with integrated 1.182V ±1% bandgap reference, programmable hysteresis via HYST pin, and TTL/CMOS-compatible output capable of sourcing up to 40mA. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), features 4μA max quiescent current over –40°C to +85°C, and supports threshold detection in battery-powered sensor interfaces.

For engineers reviewing the MAX921CSA-TG05 datasheet, MAX921CSA-TG05 pinout, MAX921CSA-TG05 application, or MAX921CSA-TG05 equivalent, key selection criteria include ultra-low supply current, rail-to-rail input range (V– to V+ – 1.3V), internal reference accuracy, hysteresis configurability without external feedback, and output drive capability for direct LED or logic-level interfacing.

Technical Context

The MAX921CSA-TG05 implements a micropower comparator core paired with a precision bandgap reference referenced to V–, not GND. Its unique output stage eliminates crowbar current during transitions, minimizing supply-line parasitic feedback and enabling stable operation without stringent PCB layout constraints.

Input common-mode range extends from V– to (V+ – 1.3V); inputs tolerate ±0.3V beyond rails. Hysteresis is implemented via the HYST pin-accepting 0.05V below REF-and enables simple two-resistor configuration for noise-immune thresholding without external op-amp feedback networks.

Key Specifications

Pinout & Package

MAX921CSA-TG05 is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with gull-wing leads, 1.27mm pitch, and standard SOIC footprint compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar comparator applications.

Compared with LM393DR and TLV3701CDR, MAX921CSA-TG05 uniquely integrates a ±1% reference and HYST-controlled hysteresis in a single 8-pin SO package, eliminating at least three external components while delivering 40mA drive and sub-5μA operation-critical for space- and power-constrained designs.

Availability

MAX921CSA-TG05 is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply and long-term production continuity.

Supply support for MAX921CSA-TG05 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, automotive, and communications markets.

The MAX921CSA-TG05 belongs to the MAX921–MAX924 micropower comparator family, designed specifically for ultra-low-power sensing and monitoring applications where supply current, reference accuracy, and ease of hysteresis implementation are critical.

FAQ

What is the operating temperature range for MAX921CSA-TG05?

The MAX921CSA-TG05 is rated for operation from –40°C to +85°C (E-grade). This extended temperature range ensures reliable performance in industrial environments, automotive under-hood modules, and outdoor sensor nodes where thermal cycling occurs. The 4μA max supply current specification is guaranteed across this full range, unlike commercial-grade variants limited to 0°C to +70°C.

Does MAX921CSA-TG05 require external components to use its internal reference?

No, MAX921CSA-TG05's 1.182V ±1% internal reference is fully functional without external components. The REF pin delivers the reference voltage referenced to V– and can source up to 25μA. However, the datasheet explicitly warns against bypassing REF with capacitors, as this may cause instability. External resistors are only needed when configuring hysteresis via the HYST pin.

Can MAX921CSA-TG05 operate from a 3V single supply?

Yes, MAX921CSA-TG05 operates from +2.5V to +11V single supply, making 3V fully supported. At 3V, it maintains ≤4μA supply current, 12μs propagation delay (10mV overdrive), and input common-mode range from V– (GND) to 1.7V. Output swings from 3V to GND, ensuring compatibility with 3V logic families when loaded appropriately.

How is hysteresis configured on MAX921CSA-TG05?

Hysteresis on MAX921CSA-TG05 is configured using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V–. The hysteresis band (VHB) ≈ 2 × (VREF – VHYST), with VHYST adjustable from (REF – 50mV) to REF. For example, setting VHYST = REF – 25mV yields ~50mV hysteresis. No feedback loop or additional op-amps are required.

What is the maximum continuous output source current of MAX921CSA-TG05?

MAX921CSA-TG05 continuously sources up to 40mA while maintaining specified performance. This is verified across temperature and supply voltage (e.g., 40mA at V+ = 5V, TA = +25°C). Short pulses exceeding 40mA (up to 100mA) are permissible if average power dissipation stays within the 471mW SO-package limit at +70°C ambient.