Analog Devices Inc./Maxim Integrated MAX6459UTA/V+

Overview

MAX6459UTA/V+ from Analog Devices is a dual-channel, high-voltage (4V–28V), AEC-Q100 qualified voltage monitor IC with independent undervoltage (OUTA) and overvoltage (OUTB) open-drain outputs, 0.5% internal threshold hysteresis, 50µs timeout, and operation from –40°C to +125°C - used for automotive battery stack supervision and fault-protected power sequencing.

For engineers reviewing the MAX6459UTA/V+ datasheet, MAX6459UTA/V+ pinout, MAX6459UTA/V+ application, or MAX6459UTA/V+ equivalent, this page delivers verified electrical parameters, automotive-grade qualification evidence, dual-output timing behavior, SOT23-6 package layout, and real-world window-detection use cases - all confirmed against the official MAX6457–MAX6460 datasheet Rev 9 (10/24).

Technical Context

The MAX6459UTA/V+ integrates two precision comparators sharing a 2.25V ±2.5% internal bandgap reference, with IN+ and IN− inputs externally configurable for adjustable trip thresholds via resistor dividers. It lacks latch logic (unlike MAX6457) and offers no extended timeout option - only fixed 50µs response after threshold crossing.

Each comparator drives a dedicated 28V-tolerant open-drain output: OUTA asserts low on undervoltage (IN+ < VTH−), OUTB asserts low on overvoltage (IN− > VTH+). Internal 0.5% hysteresis eliminates external feedback components and ensures noise immunity in automotive transients.

Key Specifications

Pinout & Package

SOT23-6 package (package code U6+1/U6+1A, outline 21-0058), 1.6mm × 2.9mm footprint, RoHS-compliant lead(Pb)-free construction. Thermal resistance θJA = 115°C/W (four-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBVR and TPS3808G33DBVR, the MAX6459UTA/V+ uniquely delivers AEC-Q100-qualified dual independent outputs, user-adjustable thresholds, and 28V tolerance - making it irreplaceable for automotive window monitoring where functional safety and voltage flexibility are mandatory.

Availability

MAX6459UTA/V+ is available at Aetrix Electronics and suitable for automotive battery management, industrial power sequencing, and medical equipment supply validation requiring stable component supply across extended temperature and lifecycle demands.

Supply support for MAX6459UTA/V+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.

The MAX6457–MAX6460 family was designed specifically for high-voltage, low-power supervisory functions in harsh environments - emphasizing AEC-Q100 compliance, wide supply range, and minimal external component count.

FAQ

What is the AEC-Q100 qualification status of the MAX6459UTA/V+?

The MAX6459UTA/V+ is explicitly AEC-Q100 qualified per Grade 0 (–40°C to +150°C ambient), as stated in the "Benefits and Features" section and Ordering Information table of the official datasheet Rev 9. This qualification applies only to the /V+ suffix variant - other MAX6459 variants (e.g., MAX6459UTA-T) are not automotive-qualified. The qualification covers stress testing, thermal cycling, and reliability validation required for under-hood automotive deployment.

Does the MAX6459UTA/V+ support window detection with separate outputs?

Yes, the MAX6459UTA/V+ is specifically designed for window detection with two independent open-drain outputs: OUTA asserts low on undervoltage (IN+ < VTH−), and OUTB asserts low on overvoltage (IN− > VTH+). When the monitored voltage is within the programmed window, both outputs remain high. This architecture eliminates need for external logic gates and enables direct connection to separate enable/disable inputs in power systems.

What are the absolute maximum ratings for the IN+ and IN− inputs of the MAX6459UTA/V+?

The MAX6459UTA/V+ specifies IN+ and IN− input voltage range as 0V to VCC, with absolute maximum ratings of –0.3V to (VCC + 0.3V). Exceeding these limits risks permanent damage. Input bias current is ±25nA max, and common-mode voltage range is limited to 0–1.4V - meaning resistor dividers must scale monitored voltages into this range while respecting the 0–VCC constraint.

Can the MAX6459UTA/V+ monitor negative voltages?

The MAX6459UTA/V+ itself cannot directly monitor negative voltages on IN+ or IN−, as both inputs require 0V ≤ VIN ≤ VCC. However, the datasheet shows that the related MAX6460 (with REF output) can monitor negative rails using a specific resistor network (Figure 14). For negative voltage monitoring with MAX6459UTA/V+, an external level-shifting circuit or op-amp interface is required - the device does not include built-in negative-input capability.

What is the purpose of the 0.5% internal hysteresis in the MAX6459UTA/V+?

The 0.5% internal hysteresis in the MAX6459UTA/V+ creates distinct rising (VTH+) and falling (VTH−) trip thresholds - for example, VTH+ = 1.228V and VTH− = 1.222V at 25°C - preventing output oscillation during slow-moving or noisy input transitions near the threshold. This eliminates need for external hysteresis resistors and ensures clean, chatter-free fault signaling in electrically noisy automotive and industrial environments.