Analog Devices Inc./Maxim Integrated MAX6412UK26+T

Overview

MAX6412UK26+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 2.625V VCC reset threshold, active-low push-pull reset output, manual reset input (MR), and capacitor-adjustable reset timeout. It monitors VCC in systems requiring precise brownout detection down to 1V supply and guarantees valid reset assertion during power-up, power-down, and transient events in automotive and industrial controllers.

For engineers reviewing the MAX6412UK26+T datasheet, MAX6412UK26+T pinout, MAX6412UK26+T application, or MAX6412UK26+T equivalent, key selection criteria include its 2.625V ±2.5% threshold accuracy over –40°C to +125°C, 1.7µA typical quiescent current at 2V, SOT23-5 package compatibility, and external capacitor–programmable reset timeout from 275µs to >5ms.

Technical Context

The MAX6412UK26+T implements a precision bandgap-based voltage comparator for VCC monitoring and a dedicated manual reset input with internal 20kΩ pullup. Its reset timeout is generated by a 240nA current source charging an external capacitor on the SRT pin, referenced to a stable 0.65V internal threshold.

It asserts an active-low push-pull RESET signal when VCC falls below 2.625V (±2.5% over temperature) or MR is pulled low, holding reset asserted for the full timeout period after both conditions clear - ensuring reliable µP initialization in noisy or slow-ramping power environments.

Key Specifications

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead-free (+T suffix), thermal resistance θJA = 255.9°C/W (multi-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G26DBVR and STM6315SW33F, the MAX6412UK26+T uniquely combines 2.625V precision threshold, manual reset with internal pullup, capacitor-adjustable timeout, and guaranteed operation down to VCC = 1V - making it optimal for automotive and industrial designs requiring configurable, low-voltage robust reset behavior.

Availability

MAX6412UK26+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and portable medical equipment requiring stable component supply, AEC-Q100-aligned reliability, and long-term production continuity.

Supply support for MAX6412UK26+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6412UK26+T belongs to the MAX6412–MAX6420 family of low-power µP supervisors engineered for reliable power-monitoring and reset generation in harsh environments with wide temperature and supply voltage variation.

FAQ

What is the exact reset threshold voltage of the MAX6412UK26+T?

The MAX6412UK26+T has a factory-trimmed VCC reset threshold of 2.625V, with ±1.25% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value is confirmed in the Electrical Characteristics table and corresponds to the "26" suffix per the Reset Voltages Suffix Table in the datasheet.

Does the MAX6412UK26+T support manual reset functionality?

Yes, the MAX6412UK26+T includes a dedicated MR (manual reset) input on Pin 3. It is active-low, features an internal 20kΩ pullup resistor, accepts logic-level signals, and requires a minimum 1µs pulse width with 75ns glitch rejection. Deasserting MR initiates the same capacitor-programmed reset timeout as a VCC brownout event.

How is the reset timeout period set on the MAX6412UK26+T?

The reset timeout period on the MAX6412UK26+T is set by connecting an external capacitor (CSRT) between Pin 4 (SRT) and ground. The relationship is tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 1500pF capacitor yields 3.00–5.75ms timeout depending on temperature.

What package type and footprint does the MAX6412UK26+T use?

The MAX6412UK26+T uses the SOT23-5 package (package code U5+2A), with 2.9mm × 1.6mm body dimensions, gull-wing leads, and RoHS-compliant lead-free finish. Its land pattern matches JEDEC MO-178AA, and thermal resistance is θJA = 255.9°C/W on a multi-layer board.

Is the MAX6412UK26+T qualified for automotive applications?

The MAX6412UK26+T is specified for –40°C to +125°C operation and is AEC-Q100 qualified per the datasheet's Benefits and Features section. While the specific /V automotive grade variant uses a different suffix (e.g., MAX6412UK26/V+T), the +T version shares the same die, process, and temperature rating - making it suitable for non-certified automotive subsystems and industrial applications with equivalent stress requirements.