Analog Devices Inc./Maxim Integrated MAX6504UKN015

Overview

MAX6504UKN015 from Maxim Integrated is a cold-temperature threshold, push-pull output temperature switch with factory-trimmed trip point of −15°C, ±0.5°C typical accuracy, 2.7V to 5.5V supply range, 30µA quiescent current, and pin-selectable 2°C or 10°C hysteresis. It directly drives fan-control logic in thermal management systems for industrial controllers and embedded power supplies.

For engineers reviewing the MAX6504UKN015 datasheet, MAX6504UKN015 pinout, MAX6504UKN015 application, or MAX6504UKN015 equivalent, this page delivers verified functional identity, SOT23-5 package mapping, confirmed cold-threshold behavior (TUNDER), push-pull output drive capability, and real-world thermal alarm use cases - all validated against Maxim's official datasheet Rev 6 (2/11).

Technical Context

The MAX6504UKN015 implements a dual-reference comparator architecture using one positive-TC and one negative-TC voltage reference; their intersection defines the −15°C trip point. Hysteresis is selected via HYST pin voltage level (GND = 2°C, VCC = 10°C), preventing output oscillation near threshold.

As a cold-threshold device, it asserts high on TUNDER when die temperature falls below −15°C. Its push-pull output sources up to 800µA at VCC > 4.5V and sinks up to 3.2mA, eliminating external pull-up resistors required by open-drain variants like MAX6503.

Key Specifications

Pinout & Package

SOT23-5 package with exposed pad not electrically connected; pins 1 and 2 are both GND (pin 2 provides lowest thermal resistance to die); pin 3 is HYST; pin 4 is VCC; pin 5 is TUNDER (push-pull active-high output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6503UKN015, the MAX6504UKN015 eliminates external components and supports direct logic drive; versus LM75BIMM-3/NOPB, it delivers deterministic, zero-latency cold-alarm response without firmware involvement or bus overhead.

Availability

MAX6504UKN015 is available at Aetrix Electronics and suitable for industrial motor controls, embedded power supplies, outdoor IoT gateways, and edge data center thermal management requiring stable component supply and long-term lifecycle support.

Supply support for MAX6504UKN015 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, autonomous thermal protection in space- and power-constrained systems - delivering factory-calibrated switching without microcontroller dependency.

FAQ

What is the exact temperature trip point of the MAX6504UKN015?

The MAX6504UKN015 has a factory-programmed cold-threshold trip point of −15°C. When the die temperature falls below this value, the TUNDER output asserts high. This threshold is trimmed during manufacturing and specified with ±0.5°C typical accuracy across 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 MAX6504UKN015 require an external pull-up resistor?

No, the MAX6504UKN015 does not require an external pull-up resistor because it features a push-pull active-high output on the TUNDER pin. Unlike the open-drain MAX6503 series, this architecture allows direct connection to CMOS logic inputs or fan-enable circuits without additional components - a key design advantage confirmed in the Pin Description and Typical Operating Circuit sections of the official datasheet.

How is hysteresis configured on the MAX6504UKN015?

Hysteresis on the MAX6504UKN015 is configured by applying a logic level to the HYST pin: connect HYST to GND for 2°C hysteresis or to VCC for 10°C hysteresis. The datasheet explicitly warns against leaving HYST floating, as that increases supply current. This pin-selectable feature is electrically verified and documented in the Applications Information section and Pin Configuration diagrams.

What is the supply current consumption of the MAX6504UKN015 at room temperature?

The MAX6504UKN015 consumes 30µA typical supply current at +25°C and across its full operating voltage range (+2.7V to +5.5V), as measured and guaranteed in the Electrical Characteristics table. This micropower performance remains stable over temperature, with less than 10% variation from −40°C to +85°C per the Supply Current vs. Temperature graph (MAX6501 TOC01).

Can the MAX6504UKN015 be used in a temperature window alarm configuration?

Yes, the MAX6504UKN015 is designed for temperature window alarms when paired with a hot-threshold device such as MAX6502UKP075. As a cold-threshold switch, it asserts high on TUNDER below −15°C; combined with a hot-threshold device's TOVER output, the two signals can be ORed to generate an out-of-window alarm - a configuration explicitly illustrated in Figure 4 of the datasheet with matching part numbering and functional description.