Analog Devices Inc./Maxim Integrated DS2401AX1-102-0D2#

Overview

DS2401AX1-102-0D2# from Maxim Integrated (formerly Dallas Semiconductor) is a factory-lasered 64-bit silicon serial number IC implementing the 1-Wire® protocol in flip-chip packaging. It provides a unique identity (8-bit family code 01h + 48-bit serial number + 8-bit CRC), operates from 2.8V to 6.0V, supports multidrop on a single data line, and delivers zero standby power consumption for PCB identification and equipment registration.

For engineers reviewing the DS2401AX1-102-0D2# datasheet, DS2401AX1-102-0D2# pinout, DS2401AX1-102-0D2# application, or DS2401AX1-102-0D2# equivalent, key selection criteria include 1-Wire bus compatibility, industrial temperature range (-40°C to +85°C), TO-92/SOT-223/TSOC/flip-chip package options, presence pulse timing (tPDH: 15–60μs), and read data validity window (tRDV = 15μs).

Technical Context

The DS2401AX1-102-0D2# implements a fixed 64-bit ROM structure with no writable memory, accessed exclusively via the Dallas 1-Wire protocol using open-drain signaling. Its operation relies entirely on parasitic power drawn from the data line, eliminating external V_CC connections and enabling direct interface to a single microcontroller I/O pin.

It supports standard 1-Wire initialization (reset/presence pulse), ROM function commands (Read ROM [33h/0Fh]), and time-slot-based communication with strict timing windows: tSLOT = 60–120μs, tLOW1 = 1–15μs, tPDL = 60–240μs. The device is reverse-compatible with DS2400 but adds true multidrop capability without requiring Match ROM or Skip ROM support.

Key Specifications

Pinout & Package

DS2401AX1-102-0D2# uses a 2-pin flip-chip package (package code BF211-1 per Maxim drawing 56-G7009-001A), with no exposed leads and laser-marked top surface. Power and data share a single terminal; ground is internally referenced via substrate connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire silicon serial number applications.

Compared with DS2401Z+ and DS2401P+T&R, DS2401AX1-102-0D2# offers the smallest form factor (flip-chip), zero external ground connection, and lowest assembly cost-but requires precise placement alignment and lacks RoHS exemption documentation in its # suffix variant.

Availability

DS2401AX1-102-0D2# is available at Aetrix Electronics and suitable for PCB identification, network node ID assignment, and equipment registration requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for DS2401AX1-102-0D2# 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 (acquired by Analog Devices in 2021) is a U.S.-based semiconductor company specializing in analog, mixed-signal, and digital ICs for industrial, communications, and computing applications.

The DS2401AX1-102-0D2# belongs to Maxim's legacy 1-Wire silicon serial number product line, designed specifically for secure, low-cost, single-pin device identification in resource-constrained embedded systems.

FAQ

What is the primary function of the DS2401AX1-102-0D2#?

The DS2401AX1-102-0D2# is a factory-lasered 64-bit silicon serial number IC that provides a globally unique, unalterable identity via the 1-Wire protocol. It contains an 8-bit family code (01h), 48-bit serial number, and 8-bit CRC-all read-only-and draws power parasitically from the data line. Its core function is hardware-level device identification without firmware or external power.

Does the DS2401AX1-102-0D2# require an external power supply?

No, the DS2401AX1-102-0D2# operates with zero external power supply. It derives all operating energy parasitically from the 1-Wire data line through an internal charge pump, enabled by the external pullup resistor (1.5kΩ–5kΩ). This eliminates the need for V_CC and GND traces, reducing PCB complexity and enabling ultra-low-power system designs.

How does the DS2401AX1-102-0D2# differ from the original DS2400?

The DS2401AX1-102-0D2# is a drop-in upgrade to the DS2400 with extended supply voltage (2.8V–6.0V vs. 2.8V–5.5V), guaranteed multidrop capability on a shared 1-Wire bus, and identical 64-bit ROM structure. Unlike the DS2400, the DS2401AX1-102-0D2# supports Read ROM commands 33h and 0Fh for full backward compatibility while enabling multiple devices per bus without collision.

What package type is used by the DS2401AX1-102-0D2#?

The DS2401AX1-102-0D2# uses a 2-pin flip-chip package (drawing 56-G7009-001A, pkgcode BF211-1), with no visible leads and laser marking on the top surface. Pin 1 is Data (DQ), Pin 2 is Ground (substrate reference). This package enables the smallest possible footprint and is optimized for automated die-bonding in high-volume module assembly.

Can the DS2401AX1-102-0D2# be used in multidrop 1-Wire configurations?

Yes, the DS2401AX1-102-0D2# is explicitly designed for multidrop 1-Wire networks. Its built-in multidrop controller ensures compatibility with other 1-Wire devices (e.g., DS1994, DS2404) on the same bus. Multiple DS2401AX1-102-0D2# units can coexist and be individually enumerated using the Search ROM command (F0h), with timing compliance verified per tSLOT = 60–120μs and tPDL = 60–240μs.