Analog Devices Inc./Maxim Integrated MAX6340UK31+T

Overview

MAX6340UK31+T from Analog Devices is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-low open-drain reset signal when voltage falls below 3.075V (typical threshold), with capacitor-adjustable timeout (3.0–5.75ms at CSRT = 1500pF), 1.6µA typical quiescent current, and guaranteed operation down to VCC = 1V - used in battery-powered controllers and automotive ECUs for reliable power-up/power-down sequencing.

For engineers reviewing the MAX6340UK31+T datasheet, MAX6340UK31+T pinout, MAX6340UK31+T application, or MAX6340UK31+T equivalent, key selection criteria include its 3.075V factory-trimmed reset threshold, SOT23-5 open-drain output architecture, -40°C to +125°C AEC-Q100 qualified temperature range, and capacitor-based timeout flexibility for µP reset timing compliance.

Technical Context

The MAX6340UK31+T implements a precision voltage-detection circuit with laser-trimmed resistors to set its 3.075V nominal reset threshold (±2.5% over temperature), coupled with a 240nA internal ramp current source charging an external SRT capacitor to generate the reset timeout delay. Its open-drain RESET output requires an external pullup and remains valid for VCC ≥ 1V.

It operates across 1.0V to 5.5V supply range, features immunity to short VCC transients (e.g., ≤50µs at 100mV overdrive), and uses BiCMOS process technology to achieve low quiescent current (1.6µA typ at VCC ≤ 2.0V) while maintaining guaranteed reset assertion during brownout conditions.

Key Specifications

Pinout & Package

MAX6340UK31+T is housed in a 5-pin SOT23-5 package (package code U5+2, outline 21-0057), with gull-wing leads, RoHS-compliant lead-free finish ("+T" suffix), and thermal pad omitted. The package supports reflow soldering per JEDEC J-STD-020 and has 571mW max power dissipation at TA = +70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP302LSN30T1G and TLV803EB30DBZR, the MAX6340UK31+T uniquely combines AEC-Q100 qualification, capacitor-adjustable timeout, and open-drain output in SOT23-5 - enabling robust, field-tunable reset behavior in automotive and industrial systems where supply dynamics vary.

Availability

MAX6340UK31+T is available at Aetrix Electronics and suitable for automotive engine control units, battery-powered medical monitors, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6340UK31+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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The MAX6340 belongs to Analog Devices' microprocessor supervisor product line, designed specifically for reliable power-monitoring and reset generation in safety-critical automotive, industrial, and portable systems.

FAQ

What is the exact reset threshold voltage of MAX6340UK31+T?

The MAX6340UK31+T has a factory-laser-trimmed nominal reset threshold of 3.075V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value corresponds to the "31" suffix in the part number per Table 1 of the datasheet.

Does MAX6340UK31+T require an external capacitor to function?

The MAX6340UK31+T does not require an external capacitor to assert reset - it functions as a basic voltage detector with SRT pin floating. However, to enable the programmable reset timeout feature, a capacitor must be connected between SRT and GND; without it, the timeout defaults to ~275µs.

Can MAX6340UK31+T drive a 3.3V microcontroller reset pin directly?

Yes - the MAX6340UK31+T features an open-drain RESET output compatible with 3.3V logic. Connect a 10kΩ–100kΩ pullup resistor from RESET to the 3.3V supply. The output sinks ≥500µA at VOL ≤ 0.3V (VCC ≥ 1.8V), ensuring solid logic-low assertion.

Is MAX6340UK31+T pin-compatible with other supervisors?

Yes - the MAX6340UK31+T is explicitly stated as pin-compatible with the LP3470. It shares the same 5-pin SOT23-5 pinout (GND, VCC, SRT, N.C., RESET), enabling drop-in replacement where LP3470 was previously used, provided the reset threshold and timeout requirements align.

What is the maximum recommended value for the SRT capacitor in MAX6340UK31+T?

The datasheet specifies CSRT values up to 10nF (10,000pF) for predictable timeout behavior. At 10nF, tRP ≈ 27.6ms. Larger capacitors increase timeout linearly but raise sensitivity to leakage and stray capacitance; ceramic C0G/NP0 types with <10nA leakage are strongly recommended.