Analog Devices Inc./Maxim Integrated MAX6665ASA60+

Overview

MAX6665ASA60+ from Maxim Integrated is a factory-programmed thermal fan controller with integrated 250mA low-side power switch, +60°C activation threshold (±3°C max error), 1°C/4°C/8°C pin-selectable hysteresis, and dual open-drain overtemperature outputs (WARN at +15°C, OT at +30°C above threshold). It operates from +2.7V to +5.5V supply and drives fans up to +24V/250mA in notebook cooling, server thermal management, and lab instrument safety systems.

For engineers reviewing the MAX6665ASA60+ datasheet, MAX6665ASA60+ pinout, MAX6665ASA60+ application, or MAX6665ASA60+ equivalent, this page delivers verified thermal trip accuracy, FANOUT drive capability, hysteresis configuration logic, WARN/OT output behavior, and SO-EP package thermal performance-critical for fail-safe fan control design and thermal shutdown validation.

Technical Context

The MAX6665ASA60+ implements a monolithic BiCMOS temperature-sensing comparator with internal reference and hysteresis control via the HYST pin (floating = 1°C, GND = 4°C, VDD = 8°C). Its FANOUT pin directly switches 250mA at <0.6V saturation under +3.3V VDD and TA ≤ TTH +10°C, enabling direct low-side fan drive without external MOSFETs.

Two independent open-drain outputs-WARN (active-low at +15°C above threshold) and OT (active-low at +30°C above threshold)-provide staged thermal response. FANON is a push-pull indicator synchronized to fan state, while FORCEON allows external override of thermal control by pulling low.

Key Specifications

Pinout & Package

MAX6665ASA60+ is housed in an 8-pin SOIC with exposed paddle (SO-EP), optimized for thermal dissipation and PCB ground plane integration. The exposed paddle is internally connected to GND and must be soldered to the system ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thermal fan control applications.

Compared with LM75BIMM-3/NOPB and ADT7470ARQZ, the MAX6665ASA60+ delivers immediate, deterministic fan activation at +60°C with zero firmware dependency, making it optimal for cost-sensitive, safety-critical, or resource-constrained embedded thermal protection where simplicity and reliability outweigh programmability.

Availability

MAX6665ASA60+ is available at Aetrix Electronics and suitable for notebook thermal management, server power supply monitoring, and laboratory instrument cooling requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed thresholds.

Supply support for MAX6665ASA60+ 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, computing, and communications applications.

The MAX6665ASA60+ belongs to Maxim's thermal management product line, engineered for autonomous, self-contained fan control in space-constrained and safety-critical systems where minimal external components and guaranteed trip accuracy are essential.

FAQ

What is the exact factory-programmed temperature threshold for MAX6665ASA60+?

The MAX6665ASA60+ has a factory-programmed fan activation threshold of +60°C, with a maximum error of ±3°C across the full operating temperature range (−40°C to +125°C). This value is laser-trimmed during production and does not require user calibration. The MAX6665ASA60+ datasheet specifies this as the nominal trip point, and electrical test data confirms distribution within ±1°C typical at +25°C ambient.

Can MAX6665ASA60+ drive a 24V fan with 250mA current?

Yes, the MAX6665ASA60+ FANOUT pin is rated for continuous 250mA at V_FANOUT < 0.6V when VDD ≥ +3.3V and ambient temperature is ≤ TTH +10°C. It supports fan supply voltages from +4.5V to +24V. At 250mA, the typical saturation voltage is <0.6V, resulting in <150mW power dissipation-within safe limits when the exposed paddle is properly soldered to a ground plane.

How do I configure hysteresis on MAX6665ASA60+?

Hysteresis on the MAX6665ASA60+ is configured solely via the HYST pin: leave it unconnected for 1°C, tie it to GND for 4°C, or tie it to VDD for 8°C. No external resistors or programming are needed. Note that self-heating from fan current increases effective hysteresis-e.g., 250mA operation adds ~7.65°C due to 51°C/W θ_JA, so total hysteresis becomes ~15.7°C when HYST = VDD.

What is the function of the FANON pin on MAX6665ASA60+?

The FANON pin on MAX6665ASA60+ is a push-pull logic output that goes high whenever the FANOUT switch is active-whether triggered by die temperature exceeding +60°C or forced on via the FORCEON pin. It provides real-time fan status to microcontrollers or LEDs without requiring external pull-up resistors, simplifying diagnostics and visual indication in compact thermal subsystems.

Are WARN and OT outputs open-drain on MAX6665ASA60+?

Yes, both WARN and OT outputs on MAX6665ASA60+ are active-low open-drain terminals. WARN asserts when die temperature reaches +75°C (+60°C +15°C), and OT asserts at +90°C (+60°C +30°C). Each requires an external pull-up resistor (typically 10kΩ to VDD or system rail) to generate a valid logic-high level when inactive. Their 2°C hysteresis prevents chatter during thermal transients.