Analog Devices Inc./Maxim Integrated MAX6503UKN015-T

Overview

MAX6503UKN015-T from Maxim Integrated is a cold-temperature threshold, open-drain, micropower 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 interfaces directly with µP reset inputs in thermal monitoring circuits for embedded computing and industrial control systems.

For engineers reviewing the MAX6503UKN015-T datasheet, MAX6503UKN015-T pinout, MAX6503UKN015-T application, or MAX6503UKN015-T equivalent, this page delivers verified functional identity, SOT23-5 package mapping, confirmed cold-threshold behavior (TUNDER activation below -15°C), hysteresis configuration logic, and real-world thermal alarm use cases - all extracted from Maxim's official datasheet Rev 6 (2/11).

Technical Context

The MAX6503UKN015-T implements a dual-reference architecture: one positive-TCO and one negative-TCO voltage reference whose intersection defines the -15°C trip point. Its internal comparator drives an active-low open-drain output (TUNDER) that sinks current when die temperature falls below the threshold.

Hysteresis is selected via the HYST pin: grounded for 2°C, tied to VCC for 10°C - preventing output oscillation near trip temperature. The device operates across -55°C to +125°C ambient, with thermal resistance θ_JA = 140°C/W and self-heating <0.05°C at 1mA sink load.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6503UKN015-T, the MAX6503UKN025-T offers identical functionality at a different cold threshold, while the LM20BIM7X/NOPB shifts responsibility for threshold decision-making to firmware - increasing design complexity and reducing response speed for critical cold-alarm events.

Availability

MAX6503UKN015-T is available at Aetrix Electronics and suitable for microprocessor thermal reset, industrial cold-start monitoring, refrigerated storage alarms, and medical diagnostic equipment safety requiring stable component supply and long-term lifecycle support.

Supply support for MAX6503UKN015-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 applications.

The MAX6501–MAX6504 family was engineered specifically for low-cost, micropower thermal supervision in space-constrained systems - delivering factory-trimmed thresholds, zero-external-component operation, and SOT23-5 integration for rapid deployment in reset, alarm, and fan-control functions.

FAQ

What is the exact temperature trip point of the MAX6503UKN015-T?

The MAX6503UKN015-T has a factory-programmed cold-temperature threshold of -15°C. It asserts its open-drain TUNDER output low when the die temperature falls below this point. This value is laser-trimmed during wafer test and specified with ±0.5°C typical accuracy over the full -55°C to +125°C operating range, as confirmed in Maxim's datasheet Rev 6 (2/11), Table 1 and Selector Guide.

Does the MAX6503UKN015-T require external components to operate?

No, the MAX6503UKN015-T requires no external components for basic operation. Its internal architecture integrates two temperature-dependent voltage references, a comparator, and an open-drain output driver. Only an external pull-up resistor on the TUNDER pin is needed for proper logic-level interfacing - typically 100kΩ - as explicitly shown in Figure 2 and stated in the General Description section of the official datasheet.

How is hysteresis configured on the MAX6503UKN015-T?

Hysteresis on the MAX6503UKN015-T is configured via the HYST pin: connect HYST to GND for 2°C hysteresis or to VCC for 10°C hysteresis. This selection is CMOS-compatible and must not be left floating, as undefined voltages increase supply current. The actual hysteresis value also depends on the programmed trip point, as shown in Figure TOC8 of the datasheet - for MAX6503UKN015-T, both settings are valid and documented.

What package type and pin count does the MAX6503UKN015-T use?

The MAX6503UKN015-T uses a 5-pin SOT23 package (package code U5+2, outline 21-0057). Pin assignments are fixed: Pins 1 and 2 are GND (with Pin 2 optimized for thermal conduction), Pin 3 is HYST, Pin 4 is VCC, and Pin 5 is TUNDER. This matches the mechanical drawing and pin configurations shown on page 8 of the official datasheet, and is consistent across all MAX6501–MAX6504 variants.

Can the MAX6503UKN015-T interface with a 5V microcontroller while powered from 3.3V?

Yes, the MAX6503UKN015-T supports voltage translation: its open-drain TUNDER output can be pulled up to a voltage higher than VCC (up to 7V), per Absolute Maximum Ratings. So when powered from 3.3V, TUNDER can drive a 5V µP reset input using a 5V pull-up resistor - a capability explicitly guaranteed in the datasheet and used in Figure 2's typical operating circuit.