Analog Devices Inc./Maxim Integrated MAX6503UKP015+

Overview

MAX6503UKP015+ from Maxim Integrated is a cold-temperature threshold, open-drain temperature switch with factory-trimmed trip point of +15°C, ±0.5°C typical accuracy, 30µA supply current, and pin-selectable 2°C/10°C hysteresis. It operates from +2.7V to +5.5V and interfaces directly with microprocessor reset inputs in thermal monitoring circuits.

For engineers reviewing the MAX6503UKP015+ datasheet, MAX6503UKP015+ pinout, MAX6503UKP015+ application, or MAX6503UKP015+ equivalent, this device serves as a low-power, no-component-required thermal alarm for cold-temperature detection in embedded systems, industrial controllers, and computing peripherals.

Technical Context

The MAX6503UKP015+ integrates two on-die temperature-dependent voltage references (one positive, one negative TC) and a comparator to define its cold-trip behavior-output asserts low when die temperature falls below +15°C. Its open-drain output requires an external pullup resistor and supports voltage levels up to 5.5V, independent of VCC.

Hysteresis is selected via the HYST pin: grounded for 2°C, tied to VCC for 10°C. The device features internal power-on reset guaranteeing stable output state for 50µs at startup, and thermal performance is optimized by dual GND pins-Pin 2 provides lowest thermal resistance to the die.

Key Specifications

Pinout & Package

SOT23-5 package with exposed thermal pad not electrically connected; dual GND pins (1 and 2) provide low-impedance ground return and minimized thermal resistance-Pin 2 is thermally optimal for die-to-PCB heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6503UKN015+, the MAX6503UKP015+ offers identical cold-switch behavior and pin compatibility but uses a different marking convention; compared with LM20BIM3/NOPB, it delivers immediate logic-level output without external components, reducing BOM count and layout area.

Availability

MAX6503UKP015+ is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic equipment, microprocessor cold-alarm systems, and fan control safety backup requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6503UKP015+ 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 is a semiconductor design and manufacturing company specializing in analog and mixed-signal ICs for power, sensing, and communication applications.

The MAX6503UKP015+ belongs to the MAX6501–MAX6504 family of micropower temperature switches, designed specifically for cost-sensitive, space-constrained thermal monitoring where factory-trimmed thresholds and zero-external-component operation are critical.

FAQ

What is the exact temperature trip point of the MAX6503UKP015+?

The MAX6503UKP015+ has a factory-programmed cold-temperature trip threshold of +15°C. When the die temperature falls below this value, the TUNDER output asserts low. This threshold is trimmed during wafer test with ±0.5°C typical accuracy across the full operating range, and does not require external calibration or adjustment. The "P015" in the part number explicitly denotes the +15°C trip point.

Does the MAX6503UKP015+ require external components to operate?

No, the MAX6503UKP015+ requires no external passive components for basic operation. Only an external pullup resistor on the TUNDER pin is needed to establish a defined high state when the output is inactive. The device integrates all sensing elements-including dual temperature-dependent references and a comparator-as well as hysteresis control logic. No capacitors, resistors, or trimming networks are necessary for functional cold-temperature switching.

How is hysteresis configured on the MAX6503UKP015+?

Hysteresis on the MAX6503UKP015+ is set via the HYST pin: connect HYST to GND for 2°C hysteresis or to VCC for 10°C hysteresis. This CMOS-compatible input must not be left floating, as undefined voltages increase supply current. The actual hysteresis magnitude also depends on the programmed trip point, as confirmed in the Typical Operating Characteristics graph (Figure TOC8), where MAX6503 shows ~2°C hysteresis at +15°C regardless of HYST setting due to internal design constraints.

Can the MAX6503UKP015+ output drive a microprocessor reset pin directly?

Yes, the MAX6503UKP015+ TUNDER pin is an active-low open-drain output specifically designed to interface with microprocessor reset inputs. When the die temperature drops below +15°C, TUNDER pulls low and sinks up to 1.2mA. With a standard 100kΩ pullup to VCC (or higher voltage), it delivers clean reset assertion compatible with most µP reset thresholds. No level-shifting or buffering is required.

What is the thermal resistance and self-heating impact of the MAX6503UKP015+ in SOT23-5?

The MAX6503UKP015+ in SOT23-5 has a typical junction-to-ambient thermal resistance (θJA) of 140°C/W. With 30µA supply current and negligible load power, self-heating is sub-0.01°C-effectively negligible. Even under worst-case sink conditions (1.2mA at 0.3V), dissipation adds only ~0.36mW, causing a maximum die temperature rise of ~0.05°C. Pin 2 provides the lowest thermal resistance path, making it the preferred ground connection for precision thermal coupling.