Analog Devices Inc./Maxim Integrated MAX6458UKD3B+T

Overview

The MAX6458UKD3B+T from Analog Devices is a dual-threshold, window voltage monitor IC in a 5-pin SOT23 package, designed for high-voltage (4V–28V) power-rail supervision. It integrates two precision comparators (one for undervoltage, one for overvoltage), internal 5% threshold hysteresis, a 150ms reset timeout, and a single open-drain output that asserts low when input falls below V_TH− or rises above V_TH+. It is used in multicell Li+ battery stacks to enable safe shutdown during out-of-window conditions.

For engineers reviewing the MAX6458UKD3B+T datasheet, MAX6458UKD3B+T pinout, MAX6458UKD3B+T application, or MAX6458UKD3B+T equivalent, key selection criteria include its 150ms timeout for transient immunity, 5% factory-trimmed hysteresis, −40°C to +125°C operation, 3.5μA supply current at 12V, and compatibility with adjustable external resistor-divider trip thresholds.

Technical Context

The MAX6458UKD3B+T implements a window-detection architecture using two independent comparators referenced to a 2.25V ±2.5% internal bandgap. Its IN+ and IN− inputs accept externally scaled voltages; trip thresholds are set via resistor dividers with no loading error due to <25nA input bias current. The device asserts OUT low when monitored voltage is outside the window - i.e., VIN+ < V_TH− or VIN− > V_TH+.

It features fixed 150ms minimum timeout (D3 option), internal undervoltage lockout down to 1.5V VCC, and hysteresis of exactly 5% of V_TH+ (factory-trimmed, not user-selectable). The open-drain output sinks up to 10mA and tolerates pullup voltages up to +28V, enabling interface with higher-voltage logic or discrete FET gate drivers.

Key Specifications

Pinout & Package

MAX6458UKD3B+T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SOT23 package (package code U5+1, outline 21-0057), footprint-compatible with standard SOT23-5 land pattern 90-0174.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar window voltage monitor applications.

Compared with TLV809E33DBVR and MAX6315US31D3+T, the MAX6458UKD3B+T uniquely delivers adjustable dual-threshold window detection across 4V–28V, with factory-trimmed 5% hysteresis and guaranteed 150ms timeout - making it irreplaceable for high-voltage safety-critical supervision where both UV and OV faults must be independently detected.

Availability

MAX6458UKD3B+T is available at Aetrix Electronics and suitable for automotive battery management, industrial 24V power rail supervision, and telecom rectifier protection requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for MAX6458UKD3B+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 industrial, automotive, communications, and healthcare markets.

The MAX6457–MAX6460 family was engineered specifically for high-voltage, ultra-low-power system supervision - targeting safety-critical applications in automotive, industrial, and telecom infrastructure where reliable, glitch-immune voltage monitoring is mandatory.

FAQ

What is the exact timeout period of the MAX6458UKD3B+T?

The MAX6458UKD3B+T has a guaranteed minimum timeout period of 150ms. This is the fixed D3 option specified in the part number suffix, and it represents the minimum time the output remains asserted after the monitored voltage re-enters the valid window. Typical values may exceed 150ms, but design must assume the minimum for timing-critical fault response.

Does the MAX6458UKD3B+T require external hysteresis components?

No, the MAX6458UKD3B+T does not require external hysteresis components. It features factory-trimmed internal hysteresis of exactly 5% of V_TH+, which is permanently set and cannot be adjusted. This eliminates external resistor networks and ensures consistent noise immunity across temperature and process variation.

Can the MAX6458UKD3B+T monitor voltages higher than its VCC supply?

No - the MAX6458UKD3B+T's IN+ and IN− inputs must remain within 0V to VCC. However, its open-drain OUT pin can be pulled up to voltages up to +28V, independent of VCC. To monitor voltages >VCC, use an external resistor divider to scale the input into the 0–VCC range before applying it to IN+ or IN−.

What is the purpose of the "B" in the MAX6458UKD3B+T part number?

The "B" in MAX6458UKD3B+T denotes the 5% internal threshold hysteresis option. Per Table 1 in the datasheet, the suffix "3B" specifies the combination of 150ms timeout (3) and 5% hysteresis (B). This is factory-trimmed and non-configurable - the device ships with this hysteresis value permanently programmed.

Is the MAX6458UKD3B+T AEC-Q100 qualified?

No, the MAX6458UKD3B+T is not AEC-Q100 qualified. Only the MAX6459UTA/V+ and MAX6459UTB/V+ variants in the same family carry AEC-Q100 qualification. The MAX6458UKD3B+T is rated for −40°C to +125°C operation and meets industrial reliability standards, but it lacks formal automotive qualification documentation.