Analog Devices Inc./Maxim Integrated MAX6361HUT46

Overview

MAX6361HUT46 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-preset 4.63V reset threshold, active-high push-pull RESET output, and 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 industrial controllers requiring reliable brownout protection.

For engineers reviewing the MAX6361HUT46 datasheet, MAX6361HUT46 pinout, MAX6361HUT46 application, or MAX6361HUT46 equivalent, this page delivers verified electrical parameters, SOT23-6 terminal mapping, battery switchover behavior, MR debounce timing, and direct alternatives for µP reset and backup power management in space-constrained embedded systems.

Technical Context

The MAX6361HUT46 integrates a precision voltage monitor, debounced manual reset input with 20kΩ internal pull-up, and VCC-to-OUT power path control. Its reset comparator uses trimmed bandgap reference, ensuring ±1.5% threshold accuracy over –40°C to +85°C, and it asserts RESET high when VCC falls below 4.63V (min 4.50V) and holds for ≥150ms after VCC recovers.

Battery switchover activates only when both conditions are met: VCC < VTH and VCC < VBATT − 20mV, with 40mV hysteresis preventing oscillation during slow VCC decay. The OUT pin sources up to 150mA from VCC or switches to VBATT (≥2.0V) with R_ON ≤1.2Ω at 25°C, enabling direct SRAM backup without external FETs.

Key Specifications

Pinout & Package

MAX6361HUT46 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 MAX6361HUT44 and TPS3808G33DBVR, the MAX6361HUT46 uniquely combines 4.63V precision reset, integrated battery switchover, and debounced MR in one SOT23-6 device - making it irreplaceable for compact +5V systems requiring SRAM retention during power failure.

Availability

MAX6361HUT46 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, POS terminals, smart meters, and battery-backed data loggers requiring stable component supply across extended product lifecycles.

Supply support for MAX6361HUT46 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 demanding industrial, automotive, and communications applications.

The MAX6361 family delivers integrated µP supervision with battery switchover for space-constrained embedded systems needing reliable power-fail response and long-term data retention - targeting portable instrumentation and ruggedized control hardware.

FAQ

What is the exact reset threshold voltage of MAX6361HUT46?

The MAX6361HUT46 has a factory-trimmed reset threshold of 4.63V (typical), with guaranteed minimum of 4.50V and maximum of 4.75V over –40°C to +85°C. This value is laser-trimmed during production and specified in Table 1 of the datasheet; it applies exclusively to the "46" suffix variant and is not adjustable. The MAX6361HUT46 uses this threshold to assert RESET when VCC falls below 4.50V and hold until VCC rises above 4.75V plus 150ms timeout.

Does MAX6361HUT46 support battery switchover, and what are the activation conditions?

Yes, MAX6361HUT46 supports automatic battery switchover to maintain power to OUT during main supply failure. Switchover activates only when two conditions are simultaneously met: VCC falls below the 4.63V reset threshold AND VCC drops at least 20mV below VBATT. A 40mV hysteresis prevents oscillation during slow VCC decay. The MAX6361HUT46 then connects BATT to OUT via an internal MOSFET, delivering up to 150mA with R_ON ≤1.2Ω at 25°C.

What is the function of the MR pin on MAX6361HUT46, and how is it debounced?

The MR pin on MAX6361HUT46 is a debounced manual reset input that asserts the active-high RESET output when pulled low. It features a 20kΩ internal pull-up resistor, allowing direct connection to a normally-open momentary switch tied to GND - no external components required. Debouncing is implemented internally with a 1µs minimum pulse-width filter and 120ns propagation delay; RESET remains asserted for ≥150ms after MR returns high, ensuring robust noise immunity without external RC networks.

Can MAX6361HUT46 operate from a 1.8V supply, and what is its quiescent current at that voltage?

Yes, MAX6361HUT46 operates from +1.2V to +5.5V, fully functional at 1.8V. At VCC = 1.8V, its supply current is 11µA (typical) and 15µA (maximum) across temperature, as specified in the Electrical Characteristics table. This ultra-low quiescent current enables multi-year operation from small batteries in always-on backup mode. The MAX6361HUT46 maintains full reset accuracy and switchover functionality down to 1.2V, with RESET asserted high and OUT sourcing from BATT when VCC drops below 4.50V.

What package type and dimensions does MAX6361HUT46 use, and is it RoHS compliant?

MAX6361HUT46 uses the SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body size with 0.95mm lead pitch. It is RoHS compliant and halogen-free, meeting IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for unlimited floor life at ≤30°C/85% RH. The package supports standard reflow profiles and is compatible with automated pick-and-place assembly. All MAX6361HUT46 units shipped by Aetrix Electronics carry full compliance documentation traceable to Maxim's original manufacturing lot data.