Analog Devices Inc./Maxim Integrated MAX6686AU75H

Overview

MAX6686AU75H from Maxim Integrated is a dual-output remote-junction temperature switch using an external diode-connected transistor for precision die-temperature monitoring. It features factory-programmed +125°C upper trip threshold, pin-selectable lower threshold range of +75°C to +115°C (in 5°C steps), ±1.5°C accuracy, open-drain active-low THIGH and TLOW outputs, and operates from 3.0V to 5.5V with 200µA typical supply current. It is used in CPU thermal protection and FPGA throttling circuits.

For engineers reviewing the MAX6686AU75H datasheet, MAX6686AU75H pinout, MAX6686AU75H application, or MAX6686AU75H equivalent, key selection criteria include its dual-threshold remote-sensing capability, µMAX package footprint, open-drain output configuration, and compatibility with on-die PNP sensing junctions in high-performance processors and programmable logic devices.

Technical Context

The MAX6686AU75H integrates a BiCMOS remote-junction sensor front-end with two independent comparators - one fixed at +125°C (THIGH), the other configurable via S1/S2 pins across +75°C–+115°C (TLOW). Both outputs feature 5°C hysteresis to prevent chatter near thresholds, and internal oversampling provides noise immunity against switching regulator interference.

It sources 8–12µA bias current into the external DXP/DXN sensing junction, requires a 2200pF ceramic capacitor across those pins for accuracy, and supports system-level shutdown and clock throttling via its two logic outputs - both open-drain and active-low, enabling wired-OR interfacing with standard 3.3V/5V logic rails.

Key Specifications

Pinout & Package

MAX6686AU75H is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), RoHS-compliant variant U8-1 per Maxim drawing 21-0036J. The package supports surface-mount reflow and provides thermal performance suitable for proximity to hot ICs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6685AU75H and LM95235CIMM/NOPB, the MAX6686AU75H delivers true hardware-based dual-threshold autonomy with open-drain outputs ideal for direct integration into legacy shutdown and throttle control paths without software intervention or level translation.

Availability

MAX6686AU75H is available at Aetrix Electronics and suitable for CPU thermal protection, FPGA temperature protection, and multichip module monitoring requiring stable component supply across industrial and computing product lifecycles.

Supply support for MAX6686AU75H 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 demanding industrial, computing, and communications applications.

The MAX6686AU75H belongs to the MAX6685/MAX6686 family of remote-junction temperature switches engineered specifically for autonomous, pin-configurable thermal monitoring of microprocessors, FPGAs, and ASICs using their built-in sensing diodes.

FAQ

What is the upper temperature trip threshold of the MAX6686AU75H?

The MAX6686AU75H has a factory-programmed upper temperature trip threshold of +125°C. This value is fixed and cannot be adjusted; it triggers the THIGH output to assert low when the remote-sensing junction exceeds this temperature. The +125°C setting is confirmed in Maxim's ordering information table and applies specifically to all MAX6686AU75H variants.

How is the lower temperature trip threshold configured on the MAX6686AU75H?

The lower temperature trip threshold of the MAX6686AU75H is set using the S1 and S2 pins, which define eight discrete points from +75°C to +115°C in 5°C increments. Configuration must occur before VDD power-up; valid states include GND, VDD, or floating. Table 1 in the datasheet maps each S1/S2 combination to its corresponding trip point, and this behavior is specific to the MAX6686AU75H's +75°C–+115°C range.

What type of output does the TLOW pin provide on the MAX6686AU75H?

The TLOW pin on the MAX6686AU75H is an open-drain, active-low output - identical in structure and function to THIGH. This differs from the MAX6685 series, which uses a CMOS push-pull active-high TLOW. The open-drain configuration allows MAX6686AU75H to interface directly with shared alarm buses and simplifies level translation across 3.3V and 5V systems.

Does the MAX6686AU75H require an external capacitor on the DXP/DXN pins?

Yes, the MAX6686AU75H requires a 2200pF ceramic capacitor connected across the DXP and DXN pins to maintain temperature measurement accuracy and suppress noise coupling. Deviation beyond ±50% from this value introduces up to ±1°C error. This capacitor placement and value are mandatory per Maxim's noise-filtering guidelines and apply uniquely to the MAX6686AU75H's remote-sensing architecture.

What is the operating supply voltage range for the MAX6686AU75H?

The MAX6686AU75H operates from 3.0V to 5.5V DC, with typical supply current of 200µA. This range supports direct connection to standard logic rails without regulation, and the device maintains full specification compliance - including ±1.5°C accuracy and 5°C hysteresis - across the entire voltage span. This supply range is explicitly defined in the Electrical Characteristics table for MAX6686AU75H.