Analog Devices Inc./Maxim Integrated DS2405AR-100-550/T

Overview

DS2405AR-100-550/T from Maxim Integrated is an addressable 1-Wire® open-drain N-channel switch IC with factory-lasered 64-bit ROM (8-bit family code 05h, 48-bit serial number, 8-bit CRC), 2.8V–6.0V operating voltage, -40°C to +85°C temperature range, and PIO pin sink capability >4mA at 0.4V. It enables remote on/off control and state sensing of individual nodes in multidrop MicroLAN systems for industrial identification and control.

For engineers reviewing the DS2405AR-100-550/T datasheet, DS2405AR-100-550/T pinout, DS2405AR-100-550/T application, or DS2405AR-100-550/T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for secure node-addressable switching in parasitically powered 1-Wire networks.

Technical Context

The DS2405AR-100-550/T implements a 1-Wire slave interface with embedded multidrop controller logic, supporting five ROM function commands (Read ROM, Match ROM, Search ROM, Active-Only Search ROM, Skip ROM) for device singulation and PIO state control. Its internal circuitry includes parasitic power harvesting via bus capacitance and a dedicated open-drain N-channel MOSFET output stage.

Communication follows Dallas Semiconductor's standard 1-Wire protocol with strict timing: reset pulse ≥480μs, time slot 60–120μs, read data valid window of 15μs, and presence pulse 60–240μs. The device operates without external power-deriving all energy from the 1-Wire bus-and uses least-significant-bit-first data transfer.

Key Specifications

Pinout & Package

DS2405AR-100-550/T is supplied in a 6-pin TSOC surface-mount package (3.7mm × 4.0mm × 1.5mm). Pin 1 = Ground, Pin 2 = Data (1-Wire bidirectional I/O), Pin 3 = PIO (open-drain N-channel output), Pins 4–6 = No Connect.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar addressable 1-Wire switch applications.

Compared with DS2405AR-100-550/T, DS2406P adds EEPROM and dual PIOs but loses parasitic operation, while DS2413P retains parasitic power and TSOC packaging but doubles PIO count and sink capability-making it suitable for more demanding load-driving tasks without layout changes.

Availability

DS2405AR-100-550/T is available at Aetrix Electronics and suitable for industrial asset tagging, secure access control nodes, and environmental sensor node enable applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for DS2405AR-100-550/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 high-reliability semiconductor solutions for industrial, automotive, and communications markets.

The DS2405AR-100-550/T belongs to Maxim's 1-Wire addressable switch product line, engineered specifically for secure, low-wire-count node identification and remote control in distributed MicroLAN architectures.

FAQ

What is the primary function of the DS2405AR-100-550/T in a 1-Wire network?

The DS2405AR-100-550/T serves as an addressable open-drain N-channel switch that enables remote on/off control and bidirectional state sensing of individual nodes via the 1-Wire bus. Its 64-bit laser-engraved ROM ensures unique identification, and its PIO pin provides >4mA sink capability at 0.4V-making DS2405AR-100-550/T ideal for driving LEDs, small relays, or logic inputs without external power. It operates entirely from parasitic bus power.

Does the DS2405AR-100-550/T require an external power supply?

No, the DS2405AR-100-550/T does not require an external V_CC supply. It derives all operating power parasitically from the 1-Wire bus using internal capacitance, enabling true single-wire operation. This eliminates the need for local power routing, decoupling capacitors, or separate ground connections-reducing system complexity and cost. DS2405AR-100-550/T remains fully functional across 2.8V–6.0V bus voltages.

How does the DS2405AR-100-550/T support multidrop configurations?

The DS2405AR-100-550/T supports multidrop operation through built-in 1-Wire multidrop controller logic and standardized ROM function commands (Match ROM, Search ROM, Active-Only Search ROM). Multiple DS2405AR-100-550/T devices can share one bus, each independently addressed by its unique 64-bit ID. The device's open-drain architecture and wired-AND signaling ensure electrical compatibility with other MicroLAN components without contention.

What is the significance of the "AR-100-550/T" suffix in DS2405AR-100-550/T?

The "AR-100-550/T" suffix identifies a specific ordering variant of the DS2405: "AR" denotes tape-and-reel packaging, "100" indicates 100-unit reel quantity, "550" refers to carrier tape pitch (5.5mm), and "/T" confirms tape-and-reel format. This variant is optimized for automated SMT assembly and matches the 6-pin TSOC package shown in the datasheet mechanical drawings.

Can the DS2405AR-100-550/T be used alongside other 1-Wire devices like DS1994 on the same bus?

Yes, the DS2405AR-100-550/T is fully compatible with other 1-Wire devices-including DS1994-on the same bus. Its Skip ROM command is non-interfering, and its ROM family code (05h) ensures proper protocol isolation. The embedded multidrop controller guarantees correct arbitration during Search ROM and Match ROM operations, allowing heterogeneous MicroLANs where DS2405AR-100-550/T handles switching while other devices provide memory or sensing.