Analog Devices Inc./Maxim Integrated MAX6361HUT31

Overview

MAX6361HUT31 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-preset 3.00V reset threshold, active-high push-pull reset output, and debounced manual reset input (MR). It operates from +1.2V supply, provides battery switchover for SRAM backup, guarantees RESET assertion down to 1.2V, and delivers 150ms minimum reset timeout - used in portable instrumentation and industrial controllers requiring reliable brownout protection.

For engineers reviewing the MAX6361HUT31 datasheet, MAX6361HUT31 pinout, MAX6361HUT31 application, or MAX6361HUT31 equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, MR debounce behavior, battery switchover hysteresis, and direct alternatives for µP reset and backup power management in space-constrained embedded systems.

Technical Context

The MAX6361HUT31 integrates a precision voltage monitor, debounced manual reset input with 20kΩ internal pull-up, and an active-high push-pull RESET output that remains high during VCC < 3.00V and for ≥150ms after VCC rises above threshold. Its internal MOSFET enables seamless switchover from VCC to VBATT when VCC falls 20mV below VBATT, with 40mV hysteresis preventing oscillation.

It monitors supply integrity across -40°C to +85°C, draws only 10µA typical supply current at VCC = 2.8V, maintains RESET/RESET validity down to 1.2V, and features 100ns glitch immunity on MR. The device powers SRAM via OUT pin, sourcing up to 150mA from VCC or VBATT depending on supply status.

Key Specifications

Pinout & Package

MAX6361HUT31 is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and industrial equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361HUT26 and TPS3123E18DBVR, the MAX6361HUT31 uniquely combines 3.00V precision reset, integrated MR debounce, and battery switchover in SOT23-6 - making it irreplaceable in portable 3.0V/3.3V systems requiring SRAM retention and field-serviceable reset capability.

Availability

MAX6361HUT31 is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC modules, medical diagnostics, smart energy meters, and battery-backed memory systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6361HUT31 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 demanding industrial, medical, and communications applications.

The MAX6361 family targets space-constrained µP systems needing robust power monitoring, battery switchover, and manual reset - with emphasis on low quiescent current, wide supply range, and guaranteed reset timing across temperature.

FAQ

What is the exact reset threshold voltage of MAX6361HUT31?

The MAX6361HUT31 has a factory-trimmed reset threshold of 3.00V (minimum 2.93V, maximum 3.08V) at +25°C, with ±1.5% variation over -40°C to +85°C. This value is laser-trimmed during production and specified in Table 1 of the datasheet. The MAX6361HUT31 uses this precise threshold to assert RESET when VCC falls below 3.00V and hold it for ≥150ms after VCC recovers.

Does MAX6361HUT31 support battery backup for SRAM, and how does switchover work?

Yes, MAX6361HUT31 supports battery backup via the BATT pin. When VCC drops below VBATT −20mV and also falls below the 3.00V reset threshold, the internal MOSFET connects VBATT to the OUT pin, powering SRAM from the backup source. Switchover includes 40mV hysteresis: VCC must rise 20mV above VBATT to revert to main supply. The MAX6361HUT31 guarantees this behavior across -40°C to +85°C with <1µA battery drain in backup mode.

What is the function of the MR pin on MAX6361HUT31, and does it require external components?

The MR pin on MAX6361HUT31 is a debounced manual reset input with an internal 20kΩ pull-up resistor. Driving MR low asserts RESET for ≥150ms after release - no external RC network is needed. A normally open switch from MR to GND suffices for front-panel reset. In noisy environments, a 0.1µF capacitor from MR to GND adds immunity. This feature is exclusive to the MAX6361 series and is fully integrated in the MAX6361HUT31.

Is MAX6361HUT31 compatible with 1.2V logic systems, and what happens to RESET output at low VCC?

Yes, MAX6361HUT31 operates down to +1.2V supply and guarantees RESET/RESET validity at that level. Its active-high RESET output remains high (asserted) as VCC decays from 3.00V to 1.2V, ensuring µP stays held in reset throughout brownout. This behavior is tested and specified - unlike many supervisors that lose output drive below 1.8V. The MAX6361HUT31 thus enables reliable shutdown sequencing in ultra-low-voltage portable designs.

What package type and footprint does MAX6361HUT31 use, and are there thermal considerations?

MAX6361HUT31 uses the SOT23-6 package (2.9mm × 1.6mm × 1.1mm), with standard JEDEC MO-178AC outline and 0.95mm pin pitch. Its thermal resistance θ_JA is 200°C/W, and max continuous power dissipation is 696mW at +70°C (derating 8.70mW/°C above). For high-current OUT loads (>50mA), keep traces short and add local copper pour under the exposed pad (if present) - though the MAX6361HUT31's 10µA ICC minimizes self-heating in most applications.