Analog Devices Inc./Maxim Integrated DS2406+T&R

Overview

DS2406+T&R from Maxim Integrated (now Analog Devices) is a dual addressable open-drain switch IC with 1024-bit one-time programmable EPROM, designed for closed-loop 1-Wire® bus control of two independent PIO channels (A and B). It features factory-lasered 64-bit ROM for absolute device identity, CRC16 error detection, and operates from 2.8V to 6.0V across –40°C to +85°C. Used in industrial sensor node identification and remote switch monitoring.

For engineers reviewing the DS2406+T&R datasheet, DS2406+T&R pinout, DS2406+T&R application, or DS2406+T&R equivalent, key selection criteria include PIO sink capability (50mA/8mA), 1-Wire parasite power operation, OTP memory architecture, conditional search support, and TO-92 tape-and-reel packaging compatibility with automated assembly.

Technical Context

The DS2406+T&R implements a hierarchical 1-Wire protocol stack with ROM function commands (Read/Match/Search/Skip/Conditional Search) followed by memory and PIO-control functions. Its internal architecture integrates 64-bit lasered ROM, 1024-bit EPROM (4×32-byte pages), 8-byte status memory (7 bytes EPROM + 1 byte SRAM), and dual PIO-control logic with channel flip-flops.

It supports parasite power operation via internal capacitor charging during 1-Wire high periods, with optional Vcc bondout only in TSOC package (not applicable to DS2406+T&R's TO-92 variant). Programming requires 12V pulses on the 1-Wire line, and all data transfers occur LSB-first with CRC16 validation at multiple protocol stages.

Key Specifications

Pinout & Package

DS2406+T&R is supplied in lead-free TO-92 package (3-pin, through-hole), optimized for cost-sensitive, space-constrained industrial nodes. No Vcc or NC pins - power and communication share the single Data line in parasite mode.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-switch-plus-memory applications.

Compared with DS2406+T&R, DS2407P+T&R adds programmable startup defaults but increases complexity and cost, while DS2413+T&R removes EPROM entirely - making it unsuitable for electronic labeling but more responsive for real-time control loops.

Availability

DS2406+T&R is available at Aetrix Electronics and suitable for industrial sensor node ID, remote load switch monitoring, legacy equipment retrofit, secure access control token, and building automation requiring stable component supply with long-term lifecycle assurance.

Supply support for DS2406+T&R 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 (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and digital ICs for industrial, automotive, and communications markets.

The DS2406+T&R belongs to the 1-Wire® addressable switch and memory product line, engineered for ultra-low-pin-count, multi-drop digital identification and control in harsh or space-constrained environments.

FAQ

What is the package type and lead finish for DS2406+T&R?

The DS2406+T&R is supplied in the TO-92 through-hole package with lead-free (RoHS-compliant) finish, delivered in tape-and-reel format compatible with automated SMT placement equipment. It does not include Vcc or NC pins - all functionality is accessed via the three-terminal configuration (GND, Data, PIO-A).

Does DS2406+T&R support parasite power operation?

Yes, DS2406+T&R fully supports parasite power operation from the 1-Wire bus across its specified voltage range (2.8V to 6.0V) and temperature range (–40°C to +85°C). Internal capacitor charging enables continuous operation during bus low periods, eliminating need for external Vcc - a key advantage in the TO-92 variant.

How is memory programmed on DS2406+T&R, and what voltage is required?

DS2406+T&R uses 1024-bit one-time programmable (OTP) EPROM. Programming requires the bus master to apply a 12V pulse (480 µs duration) on the 1-Wire line during write sequences. Only devices supporting EPROM programming should be present on the bus during this operation, and data integrity is verified via CRC16 before and after each byte write.

Can DS2406+T&R be used alongside other 1-Wire devices on the same bus?

Yes, DS2406+T&R is fully compatible with the Dallas Semiconductor 1-Wire protocol and includes built-in multidrop controller logic. Multiple DS2406+T&R units - along with other 1-Wire devices like DS18B20 or DS2438 - can coexist on a single bus, identified uniquely by their 64-bit ROM and addressed individually or via Conditional Search.

What is the difference between DS2406+T&R and DS2406P+T&R?

DS2406+T&R uses the TO-92 package (3-pin), while DS2406P+T&R uses the 6-pin TSOC package. The TSOC variant includes Vcc and NC pins (pins 4 and 5), enabling optional external power supply - a feature absent in DS2406+T&R. Both share identical electrical specifications, memory map, and 1-Wire functionality.