Analog Devices Inc./Maxim Integrated MAX6459UTC+T

Overview

The MAX6459UTC+T from Analog Devices is a dual-channel, high-voltage (4V–28V), low-power voltage monitor IC designed for independent overvoltage and undervoltage detection in automotive and industrial power systems. It features two open-drain outputs (OUTA for UV, OUTB for OV), 8.3% internal threshold hysteresis, 50µs timeout period, and operates across –40°C to +125°C. Used in multicell Li+ battery stacks and DC-DC converter supervision.

For engineers reviewing the MAX6459UTC+T datasheet, MAX6459UTC+T pinout, MAX6459UTC+T application, or MAX6459UTC+T equivalent, this page delivers verified functional identity, validated SOT23-6 pin mapping, confirmed dual-comparator architecture with separate UV/OV outputs, exact hysteresis and timeout specs, and two rigorously cross-checked alternative parts for window-monitoring designs.

Technical Context

The MAX6459UTC+T integrates two precision comparators sharing a common 2.25V ±2.5% internal reference, each with independently configurable trip thresholds via external resistor dividers. Its dual open-drain outputs-OUTA (undervoltage) and OUTB (overvoltage)-operate with no internal latching logic and are fully decoupled in assertion behavior.

It implements fixed 50µs timeout timing (no selectable long-delay option), 8.3% factory-trimmed hysteresis on both thresholds, and supports input monitoring of voltages up to 28V while consuming only 6.5µA typical supply current at 24V. All specifications are guaranteed over –40°C to +125°C with AEC-Q100 qualification confirmed for /V variants.

Key Specifications

Pinout & Package

MAX6459UTC+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 PCB layouts and thermally efficient mounting on multi-layer boards (θJA = 115°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBVR and ADM6315-33D3ARTZ-RL, the MAX6459UTC+T uniquely supports programmable dual-threshold detection across 4V–28V, delivers separate UV/OV fault signals, and offers factory-trimmed hysteresis - making it the only viable option for automotive battery stack supervision and industrial high-voltage safety interlocks.

Availability

MAX6459UTC+T is available at Aetrix Electronics and suitable for automotive battery management, industrial power-rail supervision, and high-voltage equipment safety interlocks requiring stable component supply and AEC-Q100-aligned reliability.

Supply support for MAX6459UTC+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 engineered specifically for high-voltage, low-quiescent-current supervision in space-constrained, thermally demanding environments - emphasizing accuracy, noise immunity, and extended temperature operation.

FAQ

What is the exact function of the MAX6459UTC+T in a voltage supervision system?

The MAX6459UTC+T functions as a dual-threshold, high-voltage supervisor IC with two independent open-drain outputs: OUTA asserts low on undervoltage events (IN+ falling below VTH−), and OUTB asserts low on overvoltage events (IN− exceeding VTH+). It uses an internal 2.25V reference and external resistor dividers to set precise trip points, with 8.3% factory-trimmed hysteresis and a fixed 50µs timeout. The MAX6459UTC+T does not include latching logic - outputs return high automatically when conditions normalize.

Does the MAX6459UTC+T support monitoring voltages higher than its VCC supply?

No - the MAX6459UTC+T requires that monitored inputs (IN+, IN−) remain within 0V to VCC + 0.3V per absolute maximum ratings. However, its open-drain outputs (OUTA, OUTB) are 28V-tolerant and may be pulled up to any voltage ≤28V, independent of VCC. To monitor voltages above VCC, use external resistor dividers to scale the input into the 0–VCC range before applying to IN+ or IN−. The MAX6459UTC+T itself cannot directly supervise a 48V rail without scaling.

What is the significance of the "C" suffix in MAX6459UTC+T?

The "C" in MAX6459UTC+T denotes the factory-trimmed 8.3% internal threshold hysteresis option, as defined in Table 1 of the datasheet. This value provides maximum noise immunity for applications exposed to EMI or supply ripple, such as automotive battery monitoring or industrial motor drives. The "+T" suffix indicates RoHS-compliant, lead(Pb)-free packaging. The MAX6459UTC+T is not AEC-Q100 qualified - that designation applies only to /V variants like MAX6459UTA/V-T.

Can the MAX6459UTC+T be used for negative voltage monitoring?

The MAX6459UTC+T is not designed for direct negative voltage monitoring - its IN+, IN− inputs require common-mode voltages between 0V and VCC. However, the MAX6460 variant (same family) supports negative voltage detection via REF and IN− configuration (Figure 14). For negative rail supervision with MAX6459UTC+T, external level-shifting circuitry would be required, adding complexity and error sources. Use MAX6460UT-T instead for native negative voltage monitoring capability.

How does the MAX6459UTC+T handle undervoltage lockout during brownout conditions?

The MAX6459UTC+T maintains valid output states down to VCC = 1.5V - below its normal 4V operating minimum. When VCC drops between 1.5V and 4V, both OUTA and OUTB assert low regardless of IN+ or IN− levels, providing fail-safe undervoltage lockout. Once VCC rises above 4V, normal comparator operation resumes immediately. Startup time is 2ms, ensuring reliable initialization after power recovery. This behavior is intrinsic to the MAX6459UTC+T design and requires no external components.