Analog Devices Inc./Maxim Integrated MAX6503CMP015

Overview

MAX6503CMP015 from ON Semiconductor is a 5-pin SOT-23A ultra-small temperature switch with factory-programmed +115°C trip threshold, +10°C hysteresis (HYST = VCC), open-drain active-low output, and ±4°C max threshold accuracy over −55°C to +125°C. It draws only 17 µA typical supply current and requires no external components, targeting microprocessor reset control in thermal fail-safe circuits.

For engineers reviewing the MAX6503CMP015 datasheet, MAX6503CMP015 pinout, MAX6503CMP015 application, or MAX6503CMP015 equivalent, this device supports precise hot-temperature monitoring in space-constrained embedded systems where low power, high accuracy, and pin-selectable hysteresis are critical design requirements.

Technical Context

The MAX6503CMP015 integrates a precision bandgap-based temperature sensor and comparator with factory-trimmed trip point at +115°C. Its internal hysteresis network switches between +2°C and +10°C based on HYST pin voltage level - grounded for low hysteresis, tied to VCC for high hysteresis.

It features an open-drain TOVER output compatible with pull-up voltages exceeding VCC, enabling direct interface to microprocessor reset inputs. The device operates across full industrial temperature range (−55°C to +125°C) with thermal performance optimized by dual GND pins (Pins 1 & 2), where Pin 2 provides lowest thermal resistance to the die.

Key Specifications

Pinout & Package

MAX6503CMP015 is housed in a 5-pin SOT-23A (EIAJ SC-74A) package with exposed thermal pad not electrically connected. Dual ground pins (1 & 2) reduce thermal resistance; Pin 2 offers lowest θ_JA path to die.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6501UKP115-T, MAX6503CMP015 offers identical thermal switching functionality but may reflect alternate marking or packaging configuration; compared with TC74A5-5.0VAT, it eliminates firmware dependency and provides faster, guaranteed sub-millisecond response to overtemperature events.

Availability

MAX6503CMP015 is available at Aetrix Electronics and suitable for thermal management in PCs and servers, over-temperature fail-safe circuits, and simple fan controllers requiring stable component supply across extended product lifecycles.

Supply support for MAX6503CMP015 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

ON Semiconductor (now part of onsemi) is a global semiconductor supplier focused on energy-efficient electronics, delivering power management, analog, sensors, and logic solutions for automotive, industrial, and cloud infrastructure markets.

MAX6503CMP015 belongs to the MAX6501/MAX6502 family of ultra-small temperature switches designed specifically for autonomous hot-temperature monitoring in space- and power-constrained embedded systems.

FAQ

What is the factory-programmed temperature threshold of the MAX6503CMP015?

The MAX6503CMP015 has a factory-programmed temperature threshold of +115°C. This means the device asserts its active-low TOVER output when the die temperature rises above +115°C. The threshold is trimmed during manufacturing and does not require external calibration. Accuracy is specified at ±4°C maximum over the full −55°C to +125°C operating range, ensuring predictable fail-safe behavior in thermal protection applications using the MAX6503CMP015.

How is hysteresis selected on the MAX6503CMP015?

Hysteresis on the MAX6503CMP015 is selected via the HYST pin (Pin 3): connect HYST to VCC for +10°C hysteresis or to GND for +2°C hysteresis. For MAX6503CMP015, the +10°C setting is confirmed by its part number suffix and application context. Floating the HYST pin is prohibited - it must be solidly tied to avoid increased supply current and undefined hysteresis behavior. This selection directly determines the temperature at which TOVER deasserts: +105°C for +10°C hysteresis with the MAX6503CMP015.

What output type does the MAX6503CMP015 feature, and how is it used?

The MAX6503CMP015 features an open-drain, active-low TOVER output (Pin 5). It sinks current when the temperature exceeds +115°C and presents high impedance otherwise. An external pull-up resistor (typically 100 kΩ) is required to generate a logic-high signal when inactive. The output supports pull-up voltages higher than VCC, enabling interface with 5 V microprocessor reset inputs even when powered from 3.3 V - a key design advantage of the MAX6503CMP015 in mixed-voltage systems.

Can the MAX6503CMP015 operate from a 3.3 V supply?

Yes, the MAX6503CMP015 operates from +2.7 V to +5.5 V, fully supporting 3.3 V nominal supplies. At VCC = 3.3 V, its typical supply current remains 17 µA, and output sink capability meets specification (VOL ≤ 0.4 V at ISINK = 3.2 mA). The HYST input thresholds scale with VCC (VIH ≥ 0.8 × VCC, VIL ≤ 0.2 × VCC), ensuring robust logic-level compatibility. All electrical characteristics in the MAX6503CMP015 datasheet are validated across this supply range.

Why does the MAX6503CMP015 have two GND pins (Pins 1 and 2)?

The MAX6503CMP015 includes two GND pins (Pins 1 and 2) to minimize thermal resistance between the PCB and the temperature-sensing die. Pin 2 provides the lowest thermal resistance path, improving thermal response time and measurement accuracy when the device is mounted near heat sources. Both pins must be connected to system ground - splitting ground connections across two pins reduces inductance and enhances noise immunity. This dual-GND layout is a deliberate thermal design feature unique to the MAX6503CMP015's SOT-23A implementation.