Analog Devices Inc./Maxim Integrated MAX6501UKP090-T

Overview

MAX6501UKP090-T from Maxim Integrated is a factory-programmed, micropower temperature switch in SOT23-5 package with +90°C hot-trip threshold, ±0.5°C typical accuracy, active-low open-drain output, and pin-selectable +2°C/+10°C hysteresis. It operates from +2.7V to +5.5V, consumes 30µA supply current, and interfaces directly with microprocessor reset inputs for thermal monitoring in high-speed computing systems.

For engineers reviewing the MAX6501UKP090-T datasheet, MAX6501UKP090-T pinout, MAX6501UKP090-T application, or MAX6501UKP090-T equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application use cases, and two rigorously cross-referenced alternative parts - all grounded in Maxim's official documentation and ordering data.

Technical Context

The MAX6501UKP090-T integrates two on-chip temperature-dependent voltage references (one positive, one negative TC) and a comparator to detect die temperature crossing its factory-trimmed +90°C threshold. Its internal power-on reset ensures stable output state for 50µs at startup.

Hysteresis is selected via the HYST pin: GND yields +2°C hysteresis; VCC yields +10°C hysteresis. The open-drain TOVER output requires an external pull-up resistor (e.g., 100kΩ) and can be pulled up to voltages exceeding VCC, enabling level-shifting flexibility in mixed-voltage systems.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin surface-mount plastic package with exposed pad not electrically connected; Pin 2 provides lowest thermal resistance path to die; recommended layout uses short, wide copper traces to ground pins 1 and 2 tied together near device.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar temperature switch applications.

Compared with MAX6501UKP090-T, the +85°C and +95°C variants offer identical functionality and layout compatibility but shift the thermal response window - enabling precise matching to system-specific thermal dynamics without redesigning circuitry or firmware.

Availability

MAX6501UKP090-T is available at Aetrix Electronics and suitable for microprocessor thermal reset, power supply overtemperature protection, industrial PLC alarms, and fan speed control trigger applications requiring stable component supply and long-term lifecycle support.

Supply support for MAX6501UKP090-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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.

The MAX6501–MAX6504 family was engineered as low-cost, micropower temperature switches for embedded thermal monitoring - delivering factory-trimmed accuracy and minimal external components to reduce design complexity and cost.

FAQ

What is the exact temperature trip point of the MAX6501UKP090-T?

The MAX6501UKP090-T has a factory-programmed hot-trip threshold of +90°C, meaning its TOVER output goes low when the die temperature exceeds +90°C. This value is trimmed during manufacturing and specified with ±0.5°C typical accuracy over the full operating temperature range. The "090" in the part number explicitly denotes the +90°C setting, consistent with Maxim's ordering nomenclature.

Does the MAX6501UKP090-T require any external components to operate?

No, the MAX6501UKP090-T requires no external components for basic operation. It integrates both temperature references and a comparator internally. However, an external pull-up resistor (typically 100kΩ) is mandatory on the TOVER pin to establish a defined logic-high state when the output is not asserted. No capacitors, resistors, or trimming networks are needed for threshold accuracy or hysteresis selection.

How is hysteresis configured on the MAX6501UKP090-T?

Hysteresis on the MAX6501UKP090-T is configured by driving the HYST pin: connect HYST to GND for +2°C hysteresis or to VCC for +10°C hysteresis. This CMOS-compatible input must not float, as indeterminate voltage levels increase supply current. The actual hysteresis value varies slightly with trip temperature per Maxim's Typical Operating Characteristics graph, but +2°C and +10°C are the guaranteed nominal selections.

Can the MAX6501UKP090-T output interface with a 1.8V microcontroller reset input?

Yes, the MAX6501UKP090-T's open-drain TOVER output can interface with a 1.8V µP reset input. Connect the external pull-up resistor to the 1.8V rail (not VCC). Since TOVER only sinks current and has no internal pull-up, it safely operates across voltage domains - the output low voltage remains ≤0.3V (at ISINK = 1.2mA), ensuring valid logic-low assertion on the 1.8V input.

What is the thermal resistance and self-heating effect of the MAX6501UKP090-T in SOT23-5 package?

The SOT23-5 package has a typical junction-to-ambient thermal resistance (θ_JA) of 140°C/W. With 30µA supply current at 5V, power dissipation is ~150µW, resulting in negligible self-heating (<0.02°C). Even under worst-case output sinking (1mA at 0.3V), added dissipation is 0.3mW - causing only ~0.042°C die temperature rise. Thus, die temperature closely tracks package temperature when mounted with good thermal contact.