Analog Devices Inc./Maxim Integrated MAX31825ANT+T

Overview

The MAX31825ANT+T from Maxim Integrated is a 1-Wire® digital temperature sensor delivering 8- to 12-bit Celsius measurements with ±1°C accuracy from 0°C to +70°C and ±1.75°C across -45°C to +145°C. It operates on parasite power or external VDD (1.6V–3.6V), features unique 64-bit ROM addressing, and integrates ALARM output and user-configurable TH/TL thresholds for thermal monitoring in space-constrained industrial and data center systems.

For engineers reviewing the MAX31825ANT+T datasheet, MAX31825ANT+T pinout, MAX31825ANT+T application, or MAX31825ANT+T equivalent, this page delivers verified electrical specs, WLP package layout, 1-Wire timing constraints, resolution-selectable conversion (8–12 bits), and real-world implementation guidance for distributed thermal sensing with location-addressable multi-sensor networks.

Technical Context

The MAX31825ANT+T implements a 1-Wire bus interface requiring only DQ and GND, with internal logic supporting parasite power harvesting via DQ and external capacitor (CPP) storage. Its 64-bit ROM includes family code 3Bh and CRC-8 validation, enabling collision-free enumeration of multiple devices on a single bus.

Two address inputs-ADD0 (resistor-strapped for 5-bit location code A4:A0) and ADD1 (logic-level strapped for A5)-enable 64 distinct physical-location identifiers without firmware mapping. The ALARM output functions exclusively in external-power mode and supports comparator or interrupt modes via Configuration Register bit D4.

Key Specifications

Pinout & Package

MAX31825ANT+T uses a 6-bump Wafer-Level Package (WLP) with 1.5mm × 1.5mm body size and 0.5mm pitch. Land pattern follows Maxim's N/A-referenced outline 21-100395.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire temperature sensing applications.

Compared with DS18B20+T and MAX31850ASA+, the MAX31825ANT+T uniquely combines location-addressable hardware pins (ADD0/ADD1), ALARM output with dual-mode operation, and ultra-compact WLP packaging-making it optimal for distributed, space-constrained thermal monitoring where physical sensor mapping and fast fault response are critical.

Availability

MAX31825ANT+T is available at Aetrix Electronics and suitable for industrial equipment monitoring, communications infrastructure thermal management, and data center server rack applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX31825ANT+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, automotive, and communications markets.

The MAX31825ANT+T belongs to Maxim's 1-Wire temperature sensor product line, engineered specifically for distributed, low-wiring-count thermal monitoring in harsh environments with wide temperature ranges and minimal PCB footprint requirements.

FAQ

What is the operating temperature range of the MAX31825ANT+T?

The MAX31825ANT+T operates from -45°C to +145°C, with guaranteed performance across this full range. Its ±1.75°C accuracy specification applies over the entire span, while improved ±1°C accuracy is specified from 0°C to +70°C. This makes the MAX31825ANT+T suitable for demanding applications such as power converter thermal monitoring and under-hood automotive sensing where extreme temperatures occur.

Does the MAX31825ANT+T support parasite power operation?

Yes, the MAX31825ANT+T supports parasite power operation using only the DQ line and GND. In this mode, it draws power from the 1-Wire bus during high states and stores charge on an external 3.3nF capacitor connected between VDD and GND. Note that parasite power requires a strong pullup during temperature conversions and restricts ALARM functionality - the ALARM output is active only in external-power mode.

How does the MAX31825ANT+T implement physical location addressing?

The MAX31825ANT+T uses two dedicated pins - ADD0 and ADD1 - to encode physical location. ADD0 accepts a precision resistor (0–905kΩ) to generate five address bits (A4:A0), while ADD1 selects the sixth bit (A5) via logic level. This yields 64 unique location IDs independent of the 64-bit ROM, enabling hardware-based mapping without firmware configuration. The MAX31825ANT+T reads the resistor value upon receipt of the Convert Location command.

What are the key differences between comparator and interrupt modes for the ALARM output on the MAX31825ANT+T?

In comparator mode (Configuration Register D4 = 0), the ALARM output asserts when temperature exceeds TH or falls below TL and de-asserts automatically once the reading returns within the window. In interrupt mode (D4 = 1), ALARM remains asserted and status bits stay set until any register is read - enabling latched fault detection for systems that poll infrequently. Critically, ALARM functionality is disabled entirely in parasite power mode and requires external VDD.

What package type and dimensions does the MAX31825ANT+T use?

The MAX31825ANT+T is packaged in a 6-bump Wafer-Level Package (WLP) with package code N61A1+1, outline number 21-100395, and footprint dimensions of 1.5mm × 1.5mm. It features a 0.5mm bump pitch and is RoHS-compliant. This ultra-compact WLP enables placement in tight spaces such as beneath heatsinks, inside sealed connectors, or on flex circuits where traditional SOIC or TO-92 packages cannot fit.