Analog Devices Inc./Maxim Integrated MAX6363HUT46

Overview

MAX6363HUT46 from Maxim Integrated is a low-power microprocessor supervisory circuit with battery switchover capability, designed for power-fail monitoring and SRAM backup in embedded systems. It features a factory-preset 4.63V reset threshold, active-high push-pull RESET output, and dedicated BATT ON indicator output. Operates from +1.2V supply and guarantees RESET/RESET validity down to 1.2V during brownout conditions - used in portable instrumentation and industrial controllers requiring reliable power sequencing.

For engineers reviewing the MAX6363HUT46 datasheet, MAX6363HUT46 pinout, MAX6363HUT46 application, or MAX6363HUT46 equivalent, this page delivers verified electrical parameters, SOT23-6 terminal mapping, battery-switchover timing behavior, and validated alternative parts for µP reset and backup-battery control functions.

Technical Context

The MAX6363HUT46 integrates precision voltage monitoring, automatic VCC-to-BATT switchover logic, and a dedicated BATT ON status flag. Its internal comparator monitors VCC against a 4.63V threshold (±1.5% over –40°C to +85°C), asserts RESET when VCC falls below threshold, and holds it for ≥150ms after VCC recovers. The BATT ON output transitions high only when VCC drops below VBATT − 0.15V and remains asserted throughout battery-backup mode.

Switchover is governed by dual conditions: VCC must be below both the reset threshold and VBATT by at least 20mV hysteresis. OUT connects to VCC above threshold and switches to VBATT when VCC falls, supporting up to 150mA from VCC or 10mA from battery - with on-resistance as low as 2.25Ω (VBATT = 2.8V, TA = +25°C).

Key Specifications

Pinout & Package

MAX6363HUT46 is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable and industrial PCBs. Pinout conforms to standard SOT23-6 top-view orientation with GND at Pin 2, enabling direct layout reuse across MAX636x family variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6363HUT44 and TPS3808G33DBVR, the MAX6363HUT46 uniquely combines precise 4.63V monitoring, integrated battery switchover, and BATT ON signaling in one SOT23-6 package - making it irreplaceable in applications requiring coordinated power-fail response and SRAM retention.

Availability

MAX6363HUT46 is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLCs, and medical point-of-care devices requiring stable component supply and long-term manufacturability.

Supply support for MAX6363HUT46 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 power management, sensing, and interface applications - with emphasis on reliability and integration for industrial and embedded markets.

The MAX636x family was developed specifically for microprocessor-based systems needing compact, low-power supervision with battery backup - addressing critical gaps in power-fail detection, SRAM retention, and status visibility.

FAQ

What is the exact reset threshold voltage of MAX6363HUT46 and how tightly is it specified?

The MAX6363HUT46 has a factory-trimmed reset threshold of 4.63V, with guaranteed accuracy of ±1.5% over the full operating temperature range (–40°C to +85°C). This value is confirmed in Table 1 of the datasheet and applies specifically to the "46" suffix variant. No external adjustment is possible - the threshold is laser-trimmed during production to ensure consistency across units and batches. The MAX6363HUT46 maintains this specification without requiring calibration or compensation circuitry.

Does MAX6363HUT46 support true battery-backup operation, and what are the switchover conditions?

Yes, MAX6363HUT46 supports true battery-backup operation. Switchover occurs only when two conditions are simultaneously met: (1) VCC falls below the 4.63V reset threshold, and (2) VCC drops at least 20mV below VBATT. Once engaged, OUT is sourced from VBATT and BATT ON goes high. The device will not power up from battery alone - initial startup requires VCC. The MAX6363HUT46 implements 40mV total hysteresis (20mV per transition) to prevent chattering during slow VCC decay.

What is the function of the BATT ON pin on MAX6363HUT46, and how is it electrically characterized?

The BATT ON pin on MAX6363HUT46 is an active-high, open-drain-compatible output that signals entry into battery-backup mode. It transitions high when VCC falls below VBATT − 0.15V and remains high until VCC rises above VBATT + 0.2V. The output can sink ≥20mA and is specified to drive LEDs, enable/disable logic, or interface with microcontroller GPIOs. Unlike RESET, BATT ON does not include a built-in timer - its state reflects real-time switchover status. This functionality is exclusive to MAX6363 variants and is not present in MAX6361 or MAX6364.

Can MAX6363HUT46 operate with a 1.2V supply, and what happens to RESET and OUT under that condition?

Yes, MAX6363HUT46 is fully specified to operate with VCC as low as +1.2V. At 1.2V, RESET remains asserted (high, due to active-high configuration) and OUT is disconnected from VCC - but the device continues monitoring and will assert BATT ON if VBATT is present and exceeds VCC by 20mV. The 1.2V minimum ensures robust operation during deep brownouts. RESET deassertion only occurs after VCC rises above 4.63V *and* remains there for ≥150ms. The MAX6363HUT46 guarantees correct logic levels and timing down to 1.2V, unlike many supervisors that lose functionality below 1.8V.

Is MAX6363HUT46 pin-compatible with other members of the MAX636x family, and which pins differ?

MAX6363HUT46 is pin-compatible with MAX6361HUT46 and MAX6364HUT46 in the SOT23-6 package - sharing identical pin assignments for GND, VCC, BATT, OUT, and RESET. The only difference is Pin 3: MAX6363HUT46 uses BATT ON, while MAX6361HUT46 uses MR (manual reset) and MAX6364HUT46 uses RESET IN. Therefore, board-level substitution is possible only if the target application does not rely on the unique Pin 3 function - e.g., replacing MAX6363HUT46 with MAX6361HUT46 would require external manual reset circuitry and loss of battery-status indication.