Analog Devices Inc./Maxim Integrated MAX6347XR46

Overview

MAX6347XR46 from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor 4.63V power supplies and assert a reset signal during brownout, power-up, or power-down events. It guarantees correct operation down to VCC = 1V, delivers ≤1µA supply current at +25°C, maintains ≥100ms reset timeout after VCC recovery, and features factory-trimmed 4.63V threshold with ±1.5% accuracy at +25°C - used in battery-powered controllers requiring reliable, low-power reset assertion.

For engineers reviewing the MAX6347XR46 datasheet, MAX6347XR46 pinout, MAX6347XR46 application, or MAX6347XR46 equivalent, this page provides verified functional identity, confirmed SC70-3 package mapping, validated active-high push-pull output behavior, exact reset threshold (4.63V), temperature-stable hysteresis (9.5mV), and direct alternative options for µP reset design.

Technical Context

The MAX6347XR46 implements a precision bandgap-based voltage comparator with internal hysteresis (9.5mV) to reject fast VCC transients while detecting drops below its 4.63V threshold. Its reset logic ensures the active-high RESET output remains asserted for ≥100ms after VCC rises above VTH, meeting JEDEC JESD84-B4.01 power-on reset timing requirements.

It operates across -40°C to +85°C with ±2.5% total threshold variation over temperature and draws ≤1µA supply current at 5.5V, enabling integration into ultra-low-power portable systems where quiescent current directly impacts battery life.

Key Specifications

Pinout & Package

MAX6347XR46 is housed in a 3-pin SC70 package (JEDEC MO-203AA), footprint-compatible with SOT23-3 but with smaller 2.0mm × 2.1mm body and 0.65mm lead pitch. This package supports high-density PCB layouts and reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6347XR46, MAX6327UR46-T offers identical electrical behavior in a larger package for backward compatibility, while TPS3124E18DBVR introduces board-level complexity and higher current draw - making MAX6347XR46 optimal for space-constrained, ultra-low-power 5V reset applications.

Availability

MAX6347XR46 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed 4.63V reset accuracy.

Supply support for MAX6347XR46 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, automotive, and computing applications, with expertise in power management and supervisory circuits.

The MAX63xx family targets cost-sensitive, space-constrained embedded systems needing reliable, low-power reset functionality - specifically engineered to replace discrete reset solutions in µP-based equipment.

FAQ

What is the exact reset threshold voltage of the MAX6347XR46?

The MAX6347XR46 has a factory-trimmed reset threshold of 4.63V with ±1.5% tolerance at +25°C. Over the full -40°C to +85°C operating range, total variation is ±2.5%, ensuring robust brownout detection in 5V systems. This value is laser-trimmed during production and documented in Maxim's official datasheet Table 1.

Does the MAX6347XR46 require any external components to function?

No, the MAX6347XR46 operates as a fully self-contained reset supervisor. It needs only three connections - VCC, GND, and RESET - with no external resistors, capacitors, or diodes required. Its internal precision reference, comparator, and push-pull driver eliminate all external components typically needed in discrete reset circuits.

What package type is used for the MAX6347XR46, and is it RoHS-compliant?

The MAX6347XR46 is supplied in a 3-pin SC70 package (JEDEC MO-203AA), measuring 2.0mm × 2.1mm with 0.65mm lead pitch. It is available in both leaded and lead-free versions; the standard ordering suffix "-T" denotes lead-free packaging compliant with RoHS Directive 2011/65/EU.

How does the MAX6347XR46 behave during fast VCC transients?

The MAX6347XR46 incorporates transient immunity circuitry that ignores negative-going VCC glitches up to 200µs in duration when the overdrive (VTH – VCC) is 100mV. This prevents false resets caused by switching noise or ESD events, as confirmed in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet Figure 4.

Can the MAX6347XR46 be used in systems powered below 2.5V?

Yes, the MAX6347XR46 guarantees correct reset state down to VCC = 1.0V, and its internal circuitry remains functional across 1.0V to 5.5V. While its 4.63V threshold is optimized for 5V systems, the device will assert reset whenever VCC falls below 4.63V - including during partial power loss in multi-rail systems where backup rails dip below threshold.