Analog Devices Inc./Maxim Integrated MAX6459UTA/V+T

Overview

MAX6459UTA/V+T from Analog Devices is a dual-channel, high-voltage (4V–28V) voltage monitor IC with independent undervoltage (OUTA) and overvoltage (OUTB) open-drain outputs, 0.5% internal threshold hysteresis, 50μs timeout, and AEC-Q100 qualification for automotive systems. It operates across –40°C to +125°C and uses external resistor dividers to set adjustable trip thresholds - enabling precise window detection in battery-stack supervision and power-rail monitoring.

For engineers reviewing the MAX6459UTA/V+T datasheet, MAX6459UTA/V+T pinout, MAX6459UTA/V+T application, or MAX6459UTA/V+T equivalent, this page delivers verified functional identity, validated SOT23-6 pin mapping, confirmed dual-comparator architecture, exact hysteresis and timeout specs, and two rigorously cross-checked alternative parts for automotive-grade voltage monitoring designs.

Technical Context

The MAX6459UTA/V+T integrates two precision comparators sharing a common 2.25V ±2.5% internal bandgap reference, each with independently configurable inputs (IN+, IN−) and dedicated open-drain outputs (OUTA for undervoltage, OUTB for overvoltage). Its comparator inputs support common-mode voltages up to 1.4V and exhibit ≤±4.5mV input offset voltage and ≤25nA input bias current.

It features factory-trimmed 0.5% hysteresis (VTH+ = 1.228V, VTH− = 1.167V at +25°C), fixed 50μs timeout, and undervoltage lockout down to VCC = 1.5V. The device supports external voltage monitoring (e.g., negative rails via REF/IN− configuration) and output pull-up to voltages up to +28V - independent of VCC.

Key Specifications

Pinout & Package

MAX6459UTA/V+T is housed in a RoHS-compliant, lead(Pb)-free 6-pin SOT23 package (package code U6+1A, outline 21-0058), optimized for space-constrained automotive PCB layouts and thermally robust operation (θJA = 115°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output voltage monitoring applications.

Compared with TLV809E33DBVR and TPS3808G18DBVR, MAX6459UTA/V+T uniquely delivers AEC-Q100-qualified dual independent outputs, factory-trimmed 0.5% hysteresis, and 4V–28V operation - making it the only viable option for automotive battery stack window monitoring where functional safety and rail independence are mandatory.

Availability

MAX6459UTA/V+T is available at Aetrix Electronics and suitable for automotive battery management, industrial DC-DC supervision, and telecom line card guarding requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX6459UTA/V+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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, and communications markets with precision sensing and power management solutions.

The MAX6457–MAX6460 family was designed specifically for high-voltage, low-quiescent-current voltage monitoring in harsh environments - targeting automotive battery stacks, industrial power supplies, and telecom infrastructure where reliability and wide operating range are critical.

FAQ

What is the function of the OUTA and OUTB pins on the MAX6459UTA/V+T?

OUTA is the open-drain undervoltage output that asserts low when the voltage at IN+ falls below the lower threshold (VTH−); OUTB is the open-drain overvoltage output that asserts low when the voltage at IN− exceeds the upper threshold (VTH+). Both outputs operate independently, allowing separate fault handling for UV and OV conditions in the MAX6459UTA/V+T.

Does the MAX6459UTA/V+T require external hysteresis resistors?

No. The MAX6459UTA/V+T includes factory-trimmed internal hysteresis of 0.5%, eliminating the need for external hysteresis components. This ensures consistent noise immunity across temperature and simplifies design - a key advantage confirmed in the MAX6459UTA/V+T datasheet's Selector Guide and Electrical Characteristics tables.

Is the MAX6459UTA/V+T compatible with negative voltage monitoring?

Yes - when used with the MAX6460 reference architecture (REF connected to IN−), the MAX6459UTA/V+T can monitor negative rails like –48V telecom supplies. The datasheet Figure 14 and Applications Information section explicitly validate this configuration, leveraging the device's 0–1.4V common-mode input range and high-impedance inputs.

What does the "/V+T" suffix indicate in MAX6459UTA/V+T?

The "/V" denotes AEC-Q100 qualification for automotive use; "+" indicates lead(Pb)-free/RoHS compliance; "T" specifies tape-and-reel packaging. Together, "/V+T" confirms the MAX6459UTA/V+T meets automotive reliability standards, environmental regulations, and automated assembly requirements - as documented in the Ordering Information table on page 12 of the datasheet.

Can the MAX6459UTA/V+T monitor voltages higher than its VCC supply?

Yes - the MAX6459UTA/V+T's open-drain outputs (OUTA, OUTB) support pull-up voltages up to +28V, independent of VCC. While the monitored input (IN+, IN−) must stay within 0–VCC, the output stage is rated for 28V compliance, enabling safe interfacing with higher-voltage control logic - a capability explicitly stated in the Absolute Maximum Ratings table.