Analog Devices Inc./Maxim Integrated MAX6512UT055

Overview

The MAX6512UT055 from Maxim Integrated is a fully integrated remote temperature switch using an external P-N junction (e.g., diode-connected transistor) to monitor remote die or board temperature. It features a factory-programmed +55°C trip threshold, ±3°C accuracy over –5°C to +55°C ambient, 5°C/10°C pin-selectable hysteresis, open-drain active-low output, and operates from +3.0V to +5.5V. It is used for microprocessor reset signaling in CPU thermal management systems.

For engineers reviewing the MAX6512UT055 datasheet, MAX6512UT055 pinout, MAX6512UT055 application, or MAX6512UT055 equivalent, key selection criteria include remote-sensing junction interface compatibility, open-drain sink capability for µP reset/interrupt lines, hysteresis configuration via HYST pin, and SOT23-6 package footprint constraints in space-constrained thermal monitoring designs.

Technical Context

The MAX6512UT055 implements a precision chopper-stabilized amplifier architecture to measure forward voltage across an external diode-connected transistor, converting it to temperature with minimal series-resistance sensitivity (<1°C error for <100Ω). Its internal bandgap reference and current-steering circuitry enable stable threshold detection independent of supply voltage variation (–0.6°C/V sensitivity).

It asserts its open-drain TOVER output low when remote temperature exceeds +55°C, requiring external pull-up for logic-level compatibility. Hysteresis is selected by biasing the HYST pin to VDD (10°C) or GND (5°C), preventing output chatter near the trip point without external components.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6 (package code U6F-6), 2.9mm × 1.6mm × 1.1mm body, lead-free option available per data sheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6511UT055 and LM75BIMM-5, the MAX6512UT055 uniquely delivers open-drain assertion for reset/interrupt lines with true remote diode sensing - enabling simpler, more responsive hardware-based thermal protection without software dependency or local-sensing limitations.

Availability

MAX6512UT055 is available at Aetrix Electronics and suitable for CPU thermal shutdown, battery pack protection, industrial PLC monitoring, and fan control applications requiring stable component supply and long-term lifecycle support.

Supply support for MAX6512UT055 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 and mixed-signal ICs for industrial, communications, computing, and consumer applications.

The MAX651x family targets cost-sensitive, space-constrained thermal monitoring where hardware-based overtemperature assertion - not digital telemetry - is required, especially in systems using remote diode sensors like CPUs or power modules.

FAQ

What is the factory-programmed temperature threshold of the MAX6512UT055?

The MAX6512UT055 has a factory-programmed temperature threshold of +55°C. This value is laser-trimmed during production and cannot be adjusted. The device asserts its open-drain TOVER output low when the remote junction temperature exceeds this fixed point, making it suitable for precise thermal shutdown applications without calibration overhead. The MAX6512UT055 is part of the MAX6511/MAX6512/MAX6513 family, all sharing identical architecture except for output type and trip point.

How does the MAX6512UT055 interface with a microprocessor reset input?

The MAX6512UT055 interfaces with a microprocessor reset input via its active-low open-drain TOVER pin, which must be pulled up to the µP's reset rail (e.g., VDD_IO) using an external resistor (typically 4.7kΩ–10kΩ). When remote temperature exceeds +55°C, TOVER sinks current and pulls the reset line low, triggering hardware reset. The MAX6512UT055's open-drain structure allows direct connection to shared reset buses and supports mixed-voltage systems without level shifters.

What external components are required for reliable operation of the MAX6512UT055?

The MAX6512UT055 requires three external components for reliable operation: (1) a 0.1µF ceramic capacitor between VDD and GND for supply decoupling; (2) a 2200pF ceramic capacitor across DXP/DXN to filter noise and maintain threshold accuracy; and (3) an external pull-up resistor on TOVER (e.g., 4.7kΩ to VDD_IO). No resistors are needed on HYST - it must be hard-wired to VDD or GND. The MAX6512UT055 also requires a diode-connected transistor (e.g., MMBT3904) as the remote sensing element.

Can the hysteresis of the MAX6512UT055 be changed after PCB assembly?

Yes, the hysteresis of the MAX6512UT055 can be changed after PCB assembly by modifying the logic level applied to the HYST pin: connect HYST to VDD for 10°C hysteresis or to GND for 5°C hysteresis. This is a CMOS-compatible input with no current requirement, so a simple jumper, solder bridge, or GPIO-controlled FET can reconfigure hysteresis in-system. The MAX6512UT055 does not support dynamic hysteresis adjustment during normal operation - the HYST pin must remain static while monitoring.

Is the MAX6512UT055 RoHS-compliant and lead-free?

The MAX6512UT055 is offered in RoHS-compliant, lead-free versions - specifically the tape-and-reel variant MAX6512UT055-T, which uses lead-free SOT23-6 packaging (pkg code U6F-6*). Per Maxim's documentation, RoHS status is indicated by the "+" suffix (e.g., MAX6512UT055+), though the base part number MAX6512UT055 may ship in either leaded or lead-free form depending on date code and distribution channel. Always verify compliance via Aetrix's certified material declarations for the specific lot of MAX6512UT055.