Analog Devices Inc./Maxim Integrated MAX6413UK44+T

Overview

MAX6413UK44+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 4.375V VCC reset threshold, active-high push-pull reset output, manual reset input (MR), and capacitor-adjustable reset timeout. It monitors single-supply systems in automotive, medical, and embedded controllers, asserting reset during brownout or power-up until timeout expires after VCC and MR recover.

For engineers reviewing the MAX6413UK44+T datasheet, MAX6413UK44+T pinout, MAX6413UK44+T application, or MAX6413UK44+T equivalent, this page delivers verified electrical specs, SOT23-5 package details, reset timing behavior, thermal limits, and real-world substitution guidance - all confirmed against Maxim's official datasheet Rev 11 (July 2019).

Technical Context

The MAX6413UK44+T implements a factory-trimmed bandgap-based voltage comparator for VCC monitoring at 4.375V ±2.5% over –40°C to +125°C, paired with a high-impedance manual reset input (MR) featuring internal 20kΩ pullup. Its reset assertion logic triggers on VCC drop below threshold or MR low, holding active-high RESET for a user-defined timeout period set by external capacitor on SRT.

Reset deassertion relies on a precision 240nA current source charging the SRT capacitor to a 0.65V internal reference; timeout accuracy is ±15% over temperature. The device guarantees valid RESET output down to VCC = 1V and supports glitch immunity for transients ≤50µs when VCC dips 100mV below threshold.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 2.9mm × 1.6mm × 1.1mm), 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 MAX6413UK44+T, the leaded MAX6413UK44-T offers identical functionality but violates modern environmental compliance, while the TPS3808G33DBVR trades adjustable timeout and MR flexibility for lower cost and higher minimum timeout - making it unsuitable for fast-recovery systems requiring sub-5ms reset hold.

Availability

MAX6413UK44+T is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6413UK44+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 medical applications, emphasizing reliability, low power, and high integration.

The MAX6412–MAX6420 family delivers configurable microprocessor supervision with capacitor-tunable reset timing, targeting systems needing robust, low-current voltage monitoring across harsh operating environments.

FAQ

What is the exact reset threshold voltage of MAX6413UK44+T?

The MAX6413UK44+T has a factory-trimmed VCC reset threshold of 4.375V, with tolerance of ±2.5% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet (suffix "44" maps to 4.375V nominal), and is guaranteed by laser trimming during production. The MAX6413UK44+T uses this fixed threshold exclusively for VCC monitoring - it does not support adjustable reset input.

Does MAX6413UK44+T support manual reset functionality?

Yes, MAX6413UK44+T includes a dedicated MR (manual reset) input on Pin 3. It is active-low, features an internal 20kΩ pullup resistor, accepts CMOS-level logic (VIH ≥ 0.7×VCC), and requires a minimum 1µs pulse width. When asserted, MR forces the active-high RESET output low for the full capacitor-programmed timeout period - identical to VCC-initiated reset behavior.

How is the reset timeout period set on MAX6413UK44+T?

The reset timeout period on MAX6413UK44+T is set by connecting an external capacitor (CSRT) between Pin 4 (SRT) and GND. The relationship is tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT in farads. For example, a 1500pF capacitor yields 4.375ms typical timeout. Ceramic capacitors with leakage <10nA are recommended.

What is the operating voltage range for MAX6413UK44+T?

MAX6413UK44+T operates from VCC = 1.0V to 5.5V. Its reset output remains valid down to VCC = 1V (guaranteed VOH ≥ 0.8×VCC and VOL ≤ 0.4V), enabling reliable supervision during deep brownout. Below 1V, output drive capability degrades - for VCC = 0V operation, a 100kΩ pullup to VCC is recommended per datasheet Figure 7.

Is MAX6413UK44+T qualified for automotive applications?

MAX6413UK44+T is rated for –40°C to +125°C operation and built in an AEC-Q100-capable process, but the specific part number MAX6413UK44+T is not certified as AEC-Q100 qualified. Automotive-qualified versions use the /V suffix (e.g., MAX6413UK44/V+T). Always verify qualification status via Maxim's official ordering information table before deploying in automotive safety-critical systems.