Analog Devices Inc./Maxim Integrated MAX6346XR46-T

Overview

MAX6346XR46-T from Maxim Integrated is a precision 4.63V active-low push-pull microprocessor supervisory circuit in SC70-3 package, monitoring VCC supply voltage and asserting reset for ≥100ms after VCC rises above threshold; designed for 2.5V–5V digital systems including portable battery-powered equipment, controllers, and intelligent instruments.

For engineers reviewing the MAX6346XR46-T datasheet, MAX6346XR46-T pinout, MAX6346XR46-T application, or MAX6346XR46-T equivalent, key selection criteria include factory-trimmed 4.63V reset threshold (±2.5% over –40°C to +85°C), 1µA max supply current, push-pull active-low RESET output, SC70-3 footprint compatibility, and immunity to fast VCC transients.

Technical Context

The MAX6346XR46-T implements a precision bandgap-based reset comparator with 9.5mV hysteresis and 40ppm/°C tempco, ensuring stable threshold behavior across temperature. Its internal logic guarantees correct reset state down to VCC = 1.2V and ignores transients shorter than ~200µs at 100mV overdrive.

It features a push-pull output stage capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V, eliminating external pull-up components. The device requires no external capacitors or resistors and operates continuously from –40°C to +85°C with full electrical specification.

Key Specifications

Pinout & Package

MAX6346XR46-T is housed in a 3-pin SC70-3 package with exposed pad (no thermal pad connection required). Pin 1 is GND, Pin 2 is active-low RESET output, Pin 3 is VCC input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TR46-T and TPS3808G33DBVR, the MAX6346XR46-T uniquely combines 4.63V precision threshold, 1µA max ICC, SC70-3 package, and push-pull output-making it optimal for space-constrained, battery-sensitive 5V µP systems where minimal BOM and guaranteed reset timing are critical.

Availability

MAX6346XR46-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, communications base stations, and test & measurement instruments requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6346XR46-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, mixed-signal, and power management ICs for industrial, computing, and communications applications.

The MAX6346XR46-T belongs to the MAX63xx family of ultra-low-power µP supervisors, engineered specifically for reliable, zero-component reset generation in battery-powered and noise-prone digital systems.

FAQ

What is the exact reset threshold voltage of MAX6346XR46-T and how tightly is it specified?

The MAX6346XR46-T has a factory-trimmed nominal reset threshold of 4.63V, guaranteed over temperature at ±2.5% (4.514V to 4.746V) across –40°C to +85°C. This tight tolerance eliminates need for external adjustment and ensures consistent brownout detection in 5V systems. The 40ppm/°C tempco further minimizes drift, making MAX6346XR46-T suitable for industrial environments where ambient temperature varies widely.

Does MAX6346XR46-T require any external components to operate?

No, MAX6346XR46-T requires zero external components. Its internal precision bandgap reference, comparator, and push-pull output stage eliminate the need for pull-up resistors, timing capacitors, or trimming potentiometers. This simplifies design, reduces PCB area, and improves reliability-especially valuable in compact portable devices where every mm² counts and MAX6346XR46-T delivers full supervisory functionality out-of-the-box.

What is the minimum VCC voltage at which MAX6346XR46-T remains functional and asserts reset correctly?

MAX6346XR46-T is fully specified down to VCC = 1.2V over the full –40°C to +85°C temperature range. At 1.2V, it continues to assert RESET low when VCC falls below 4.63V and maintains reset for ≥100ms after recovery. This extended low-voltage operation enables robust brownout protection even as battery voltage decays well below nominal levels-critical for maximizing usable capacity in MAX6346XR46-T–based portable systems.

How does the push-pull output of MAX6346XR46-T differ from open-drain alternatives like MAX6348XR46-T?

The MAX6346XR46-T features an active-low push-pull RESET output that both sources and sinks current-driving high to ≥0.8·VCC when inactive and low to ≤0.3V when asserted. In contrast, MAX6348XR46-T uses open-drain output requiring an external pull-up. This makes MAX6346XR46-T ideal for systems lacking dedicated pull-ups or needing faster rise times, while avoiding extra components and potential weak-pull issues that can affect timing margins in MAX6346XR46-T deployments.

Is MAX6346XR46-T pin-compatible with legacy Maxim supervisors such as MAX809?

Yes, MAX6346XR46-T shares identical pinout (GND, RESET, VCC) and SC70-3 footprint with MAX809 series supervisors, enabling drop-in replacement in existing designs. However, MAX6346XR46-T offers lower 1µA supply current versus MAX809's 2.5µA, tighter threshold accuracy, and improved transient immunity. Designers upgrading to MAX6346XR46-T retain full mechanical compatibility while gaining measurable performance benefits without PCB rework.