Analog Devices Inc./Maxim Integrated MAX6313UK46D3-T

Overview

MAX6313UK46D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC and an external undervoltage input (RST IN) while providing an active-high push/pull reset output. It features a factory-set 4.63V ±2.5% VCC reset threshold, 140ms minimum reset timeout, manual-reset input (MR), and guaranteed RESET validity down to VCC = 1.0V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset assertion.

For engineers reviewing the MAX6313UK46D3-T datasheet, MAX6313UK46D3-T pinout, MAX6313UK46D3-T application, or MAX6313UK46D3-T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, thermal stability data, and validated alternative options for dual-supply monitoring designs.

Technical Context

The MAX6313UK46D3-T implements a precision internal voltage divider to monitor VCC against a factory-trimmed 4.63V threshold with ±2.5% tolerance over –40°C to +85°C. It simultaneously compares an external voltage at RST IN against a 1.23V internal reference, enabling independent undervoltage supervision of a second rail.

Its active-high push/pull RESET output sources ≥0.8×VCC at 150µA and sinks ≤0.3V at 1.2mA, ensuring robust interface with microcontrollers. The MR input includes a 63.5kΩ internal pull-up and supports TTL/CMOS logic levels, with reset asserted during MR low and held for the full 140ms timeout after MR release.

Key Specifications

Pinout & Package

MAX6313UK46D3-T is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts and compatible with standard reflow profiles including lead-free soldering at +260°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-rail supervisory applications.

Compared with MAX6313UK46D2-T and TPS3808G33DBVR, the MAX6313UK46D3-T uniquely combines factory-set 4.63V VCC supervision, 140ms timeout, active-high push/pull output, and RST IN capability in one SOT23-5 device-enabling compact, robust dual-rail reset generation without design compromises.

Availability

MAX6313UK46D3-T is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, automotive infotainment head units, smart energy meters, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6313UK46D3-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space- and power-constrained systems, delivering precision reset thresholds, dual-input monitoring, and factory-programmed timing in ultra-small packages.

FAQ

What is the exact factory-set reset threshold voltage for MAX6313UK46D3-T?

The MAX6313UK46D3-T has a factory-trimmed VCC reset threshold of 4.63V with ±2.5% tolerance over the full –40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The threshold is implemented using an internal precision voltage divider and does not require external calibration.

Does MAX6313UK46D3-T support monitoring of a second voltage rail besides VCC?

Yes, MAX6313UK46D3-T supports secondary rail supervision via its RST IN pin, which compares an external voltage to a stable 1.23V internal reference. By connecting a resistor divider from the second rail to RST IN and GND, users can program an independent undervoltage reset threshold-for example, 3.3V or 2.5V-without additional ICs or references.

What is the function and electrical behavior of the MR pin on MAX6313UK46D3-T?

The MR pin on MAX6313UK46D3-T is a manual-reset input with an internal 63.5kΩ pull-up resistor. A logic-low pulse ≥1.5µs asserts RESET active-high for the full 140ms timeout period. MR accepts TTL/CMOS logic levels and requires no external debounce; it is commonly connected to a momentary switch tied to GND. Its voltage rating is limited to (VCC + 0.3V), so MR should be driven from the same supply as VCC.

How does the RESET output of MAX6313UK46D3-T behave when VCC drops below 1.0V?

The RESET output of MAX6313UK46D3-T is guaranteed valid down to VCC = 1.0V, meaning it maintains correct logic-high state and drive strength until that point. Below 1.0V, output sourcing capability degrades, and external pull-up or pull-down resistors may be needed to ensure defined logic levels for connected µPs. The device itself remains functional and asserts RESET as long as VCC stays above absolute minimum 1.0V.

Is MAX6313UK46D3-T compatible with lead-free reflow soldering processes?

Yes, MAX6313UK46D3-T is qualified for lead-free reflow soldering at +260°C peak temperature, as specified in the Absolute Maximum Ratings table. The "-T" suffix denotes tape-and-reel packaging with lead-free finish. For RoHS-compliant assembly, standard JEDEC J-STD-020D reflow profiles apply, and no special handling beyond standard SOT23-5 thermal management is required.