Analog Devices Inc./Maxim Integrated MAX6346XR35-T

Overview

MAX6346XR35-T from Maxim Integrated is a precision 3.5V active-low push-pull microprocessor supervisory circuit in SC70-3 package, monitoring VCC supply voltage and asserting reset for ≥100ms after VCC rises above 3.5V threshold (±2.5% over -40°C to +85°C), with ultra-low 1µA max supply current and immunity to fast transients - used in portable battery-powered µP systems requiring reliable power-on reset.

For engineers reviewing the MAX6346XR35-T datasheet, MAX6346XR35-T pinout, MAX6346XR35-T application, or MAX6346XR35-T equivalent, this page delivers verified reset threshold accuracy, SC70-3 package compatibility, push-pull output drive capability, transient rejection behavior, and direct alternatives for 3.5V system supervision.

Technical Context

The MAX6346XR35-T implements a factory-trimmed bandgap-based reset comparator with 3.5V nominal threshold (±2.5% over full temperature range), hysteresis of 9.5mV, and guaranteed correct operation down to VCC = 1.2V. Its push-pull RESET output drives low (≤0.3V at 1.6mA) during reset and high (≥0.8·VCC) when inactive.

It features 20µs typical VCC-to-reset delay, 100–280ms power-up reset timeout, and immunity to negative-going VCC transients up to 200µs at 100mV overdrive - enabling robust brownout detection without external components in space-constrained designs.

Key Specifications

Pinout & Package

MAX6346XR35-T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), with 0.65mm pin pitch and exposed pad not present. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MAX6326XR35-T, MAX6346XR35-T guarantees operation down to 1.2V (not 1.0V) with consistent 1µA ICC across all VCC conditions, while TPS3123E18DBVR provides higher accuracy at a different threshold - making MAX6346XR35-T the only drop-in 3.5V SC70-3 reset supervisor with full industrial temp range validation.

Availability

MAX6346XR35-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart metering endpoints, and automated test equipment requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6346XR35-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) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, with emphasis on low-power, high-reliability solutions.

The MAX6346XR35-T belongs to the MAX63xx family of ultra-low-power µP supervisors, engineered specifically for battery-critical and thermally demanding embedded systems requiring accurate, glitch-immune reset generation.

FAQ

What is the exact reset threshold voltage of MAX6346XR35-T and how does it vary with temperature?

The MAX6346XR35-T has a nominal reset threshold of 3.500V at +25°C, with factory trim accuracy of ±1.5% at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in ≤±12mV drift across the industrial temperature span - confirmed in Table 1 and Electrical Characteristics section of the datasheet.

Does MAX6346XR35-T require any external components to function as a reset supervisor?

No, MAX6346XR35-T requires zero external components. It integrates the voltage reference, comparator, timer, and push-pull output driver in a single SC70-3 package. Unlike RC-based reset circuits, MAX6346XR35-T delivers precise, temperature-stable reset timing without capacitors, resistors, or manual adjustment.

What is the maximum VCC voltage the MAX6346XR35-T can withstand, and what happens below its minimum operating voltage?

MAX6346XR35-T supports VCC from 1.2V to 5.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.2V, the device is not guaranteed to assert reset correctly; above 5.5V risks permanent damage. The reset output remains valid down to 1.2V, ensuring supervision integrity during deep brownout events.

How does the push-pull output of MAX6346XR35-T differ from open-drain alternatives like MAX6348XR35-T?

The MAX6346XR35-T's push-pull RESET output actively drives both high (≥0.8·VCC) and low (≤0.3V at 1.6mA), eliminating the need for an external pull-up resistor. In contrast, MAX6348XR35-T uses open-drain output requiring a pull-up, increasing BOM count and slowing rise time - making MAX6346XR35-T preferable for compact, low-component-count designs.

Is MAX6346XR35-T pin-compatible with legacy Maxim reset ICs such as MAX809 or MAX810?

Yes, MAX6346XR35-T is pin-compatible with MAX809 and MAX810 in SC70-3 and SOT23-3 packages, sharing identical 3-pin pinout (VCC, RESET, GND) and footprint. This allows direct replacement in existing designs without PCB modification, provided the 3.5V threshold and push-pull output meet system requirements.