Analog Devices Inc. AD7414ARM-1

Overview

AD7414ARM-1 from Analog Devices is a ±0.5°C accurate, 10-bit digital temperature sensor in a 6-lead SOT-23 package, featuring SMBus/I²C-compatible serial interface, overtemperature alert (ALERT) output, and programmable high/low temperature thresholds. It operates from −40°C to +125°C with 0.25°C resolution and 25 µs typical conversion time, used for thermal monitoring in PC motherboards and embedded control systems.

For engineers reviewing the AD7414ARM-1 datasheet, AD7414ARM-1 pinout, AD7414ARM-1 application, or AD7414ARM-1 equivalent, key selection criteria include its ±0.5°C accuracy at +40°C, open-drain ALERT functionality, AS-pin-selectable I²C address (1001 100), 3 µA shutdown current, and compatibility with SMBus alert protocol in space-constrained thermal management designs.

Technical Context

The AD7414ARM-1 integrates a bandgap-based temperature sensor and successive-approximation ADC to deliver 10-bit twos-complement temperature data with 0.25°C LSB resolution. Its internal oscillator triggers automatic conversions every 800 ms, while the one-shot mode enables on-demand measurement via configuration register write.

It implements full SMBus/I²C slave functionality with 7-bit address (1001 100 for -1 version), supports active-low or active-high ALERT polarity, and uses an AS pin to select among three I²C addresses per variant - enabling up to eight unique addresses across the AD7414 family without external address pins.

Key Specifications

Pinout & Package

AD7414ARM-1 is housed in a 6-lead SOT-23 (RJ-6) package with 190.4°C/W junction-to-ambient thermal resistance, optimized for surface-mount reflow on standard 2-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor applications.

Compared with LM75BIMM-5/NOPB and MAX31820MUA+, the AD7414ARM-1 uniquely combines ±0.5°C accuracy, programmable thresholds, open-drain ALERT, and AS-pin address flexibility in a 6-lead SOT-23 - making it optimal for I²C-based thermal safety systems requiring deterministic interrupt behavior and multi-node scalability.

Availability

AD7414ARM-1 is available at Aetrix Electronics and suitable for PC motherboard thermal management, industrial PLC cabinet sensing, hard disk drive bay monitoring, and network switch power supply sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7414ARM-1 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision sensing and signal chain solutions.

The AD7414ARM-1 belongs to Analog Devices' precision digital temperature sensor product line, designed specifically for embedded thermal monitoring applications demanding high accuracy, low power, and SMBus/I²C interoperability in compact form factors.

FAQ

What is the guaranteed accuracy specification of the AD7414ARM-1 over its full operating temperature range?

The AD7414ARM-1 guarantees ±3.0°C maximum accuracy over the full −40°C to +125°C range at 5.5 V supply. At +40°C, its typical accuracy is ±0.5°C, and it achieves ±2.0°C maximum over −40°C to +125°C at both 3 V and 5.5 V supplies - verified across 100% production testing at 40°C per Rev. H datasheet Table 1.

How does the AS pin function on the AD7414ARM-1, and what I²C address does it select?

On the AD7414ARM-1, the AS pin is tied to GND to select the I²C address 1001 100 (0x4C). This is fixed for the "-1" variant per Table 4 of the datasheet; floating or connecting AS to VDD yields different addresses only on -0 or -3 variants - not applicable to AD7414ARM-1.

Can the AD7414ARM-1 operate in shutdown mode while still responding to I²C commands?

Yes - the AD7414ARM-1 supports wake-on-access: when in shutdown mode (PD bit = 1), issuing an I²C START condition automatically powers up the device, allowing immediate register read/write. After command completion, it returns to shutdown unless explicitly kept active.

What is the role of the ALERT output on the AD7414ARM-1, and how is its polarity configured?

The ALERT output on the AD7414ARM-1 is an open-drain indicator that asserts when temperature exceeds the THIGH register value. Its polarity is set via bit D4 of the configuration register: D4 = 0 configures active-low, D4 = 1 configures active-high - enabling direct compatibility with either interrupt-input or SMBus-alert-capable hosts.

Does the AD7414ARM-1 support both automatic and on-demand temperature conversions?

Yes - the AD7414ARM-1 supports two modes: automatic conversion every 800 ms (default on power-up), and on-demand one-shot conversion triggered by writing '1' to bit D2 of the configuration register. The latter initiates a full conversion cycle (25 µs) even from shutdown mode, then auto-returns to low-power state.