Analog Devices Inc./Maxim Integrated MAX6501UKP045-T

Overview

MAX6501UKP045-T from Maxim Integrated is a factory-programmed, micropower temperature switch with +45°C hot-trip threshold, active-low open-drain output, and pin-selectable 2°C/10°C hysteresis. It operates from +2.7V to +5.5V, consumes 30µA typical supply current, achieves ±0.5°C typical threshold accuracy over -55°C to +125°C, and requires no external components. It is used for microprocessor reset assertion in high-speed computing thermal monitoring.

For engineers reviewing the MAX6501UKP045-T datasheet, MAX6501UKP045-T pinout, MAX6501UKP045-T application, or MAX6501UKP045-T equivalent, key selection criteria include trip-point accuracy, open-drain drive capability, hysteresis configuration, SOT23-5 thermal performance, and compatibility with µP reset inputs under low-power constraints.

Technical Context

The MAX6501UKP045-T integrates dual on-chip temperature-dependent voltage references (one positive TC, one negative TC) and a comparator to detect die temperature crossing +45°C. Its internal power-on reset ensures defined output state for 50µs at startup.

Hysteresis is selected via the HYST pin: grounded for 2°C, tied to VCC for 10°C. The open-drain TOVER output sinks up to 1.2mA and supports pull-up to voltages exceeding VCC, enabling level-shifting interface with µP reset inputs.

Key Specifications

Pinout & Package

SOT23-5 package with exposed thermal pad not electrically connected; Pin 2 provides lowest thermal resistance path to die for optimal temperature tracking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6501UKP045-T, the +55°C variant offers relaxed trip timing for higher thermal inertia systems, while the LM75BIMM-3/NOPB trades simplicity and ultra-low power for digital configurability and measurement capability - neither is pin-compatible, but both serve discrete thermal event detection roles.

Availability

MAX6501UKP045-T is available at Aetrix Electronics and suitable for microprocessor reset, fan control enable, and overtemperature alarm applications requiring stable component supply and guaranteed RoHS-compliant sourcing.

Supply support for MAX6501UKP045-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 industrial, communications, and computing markets.

The MAX6501–MAX6504 family delivers low-cost, micropower thermal protection for space-constrained systems where hardware-based, zero-software-overhead temperature response is critical.

FAQ

What is the exact factory-programmed temperature threshold of the MAX6501UKP045-T?

The MAX6501UKP045-T has a factory-programmed hot-trip threshold of +45°C. This means the TOVER output goes low when the die temperature exceeds +45°C. The threshold is trimmed to ±0.5°C typical accuracy across the full -55°C to +125°C operating range, and the device is specified with ±6°C maximum error. No external calibration is required for this fixed threshold.

How does the hysteresis setting affect the behavior of the MAX6501UKP045-T?

The MAX6501UKP045-T uses the HYST pin to select between 2°C and 10°C hysteresis. When HYST is connected to GND, hysteresis is 2°C - the output returns high when temperature falls to +43°C. When HYST is tied to VCC, hysteresis is 10°C - the output returns high at +35°C. This prevents output chatter near the trip point and must be configured externally; leaving HYST floating increases supply current and degrades performance.

Can the MAX6501UKP045-T drive a microprocessor reset input directly?

Yes, the MAX6501UKP045-T can drive a microprocessor reset input directly. Its active-low open-drain TOVER output sinks up to 1.2mA and supports an external pull-up resistor (e.g., 100kΩ) to the µP's reset rail. The output voltage remains below 0.3V when sinking 1.2mA, satisfying standard reset input low-level requirements. No level-shifting or buffering is needed for common 3.3V or 5V µP reset circuits.

What is the thermal resistance and self-heating impact of the MAX6501UKP045-T in SOT23-5 package?

The MAX6501UKP045-T in SOT23-5 has a typical junction-to-ambient thermal resistance (θJA) of 140°C/W. With 30µA supply current at 5V, power dissipation is ~150µW, resulting in negligible self-heating (<0.03°C). Even under worst-case sink conditions (1.2mA @ 0.3V), additional dissipation is 0.36mW - causing only ~0.05°C die temperature rise. Pin 2 provides the lowest thermal resistance path, making PCB layout critical for accurate sensing.

Is the MAX6501UKP045-T RoHS-compliant and lead-free?

Yes, the MAX6501UKP045-T is RoHS-compliant and lead-free. The "+T" suffix denotes tape-and-reel packaging with lead(Pb)-free/RoHS-compliant construction, per Maxim's documentation. The device meets EU RoHS Directive 2011/65/EU requirements and carries appropriate marking per JEDEC standards. Full compliance documentation is available through Analog Devices' product change notifications.