Analog Devices Inc./Maxim Integrated DS2405P+T&R

Overview

DS2405P+T&R from Maxim Integrated is a 1-Wire® addressable 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 4mA PIO sink capability at 0.4V. It enables remote on/off control and state sensing of individual nodes in multidrop MicroLAN systems for asset tagging and distributed I/O.

For engineers reviewing the DS2405P+T&R datasheet, DS2405P+T&R pinout, DS2405P+T&R application, or DS2405P+T&R equivalent, this page delivers verified technical context, TSOC package pin mapping, real-world use cases in industrial identification and sensor node control, and two confirmed alternative parts with functional and application-level distinctions.

Technical Context

The DS2405P+T&R implements a parasitically powered 1-Wire slave interface with embedded multidrop controller logic, supporting standard ROM function commands (Match ROM, Search ROM, Active-Only Search ROM) to isolate and toggle its PIO pin without external power. Its 64-bit ROM structure ensures absolute device uniqueness and enables bus-level singulation.

Communication follows Dallas Semiconductor's 1-Wire protocol at up to 16.3kbits/s using a single bidirectional data line with 5kΩ pullup; the PIO pin operates as an open-drain output with no standby current draw and full logic-level sensing capability over the entire supply range.

Key Specifications

Pinout & Package

DS2405P+T&R is supplied in a 6-pin TSOC (Thin Small Outline Carrier) package with exposed pad thermal design, optimized for compact PCB layouts and high-volume automated placement. Pin 1 and Pin 4 are both ground terminals for low-impedance return path and noise immunity; Pins 5 and 6 are no-connect.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2405P+T&R, DS2413+T&R offers dual outputs and higher drive strength but increases node complexity, while DS2406+T&R adds EEPROM for configuration storage at the cost of larger firmware footprint and slower write cycles-neither is pin-compatible, but both maintain identical 1-Wire protocol and ROM structure for seamless bus integration.

Availability

DS2405P+T&R is available at Aetrix Electronics and suitable for industrial asset tagging, smart sensor node control, and distributed I/O expansion requiring stable component supply, long-term lifecycle support, and tape-and-reel compatibility for automated manufacturing.

Supply support for DS2405P+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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, automotive, and communications markets, with emphasis on low-power, high-reliability solutions.

The DS2405P+T&R belongs to Maxim's 1-Wire® addressable switch product line, engineered specifically for distributed identification and control in resource-constrained embedded systems where minimal wiring and zero-standby-power operation are critical.

FAQ

What is the primary function of the DS2405P+T&R in a 1-Wire network?

The DS2405P+T&R functions as an addressable open-drain N-channel switch that enables remote on/off control and logic-level sensing of its PIO pin via the 1-Wire bus. Each DS2405P+T&R has a unique 64-bit ROM, allowing individual selection and state manipulation among multiple devices on a single bus-making it ideal for asset tagging and distributed I/O applications.

Does the DS2405P+T&R require an external power supply?

No, the DS2405P+T&R operates parasitically from the 1-Wire bus and requires no external V_CC. It harvests energy during bus high periods to charge an internal capacitor, sustaining operation during low periods. This eliminates the need for dedicated power traces or regulators, simplifying system design and reducing component count.

How does the DS2405P+T&R differ from the DS2405Z and DS2405 variants?

The DS2405P+T&R uses a 6-pin TSOC package, whereas DS2405Z is in a 4-pin SOT-223 and DS2405 is in TO-92. All share identical electrical specifications, ROM structure, and 1-Wire protocol-but differ mechanically. The "+T&R" suffix indicates tape-and-reel packaging for automated SMT assembly, confirming DS2405P+T&R is the surface-mount, reel-ready version of the TSOC variant.

Can multiple DS2405P+T&R devices share the same 1-Wire bus?

Yes, multiple DS2405P+T&R devices can coexist on a common 1-Wire bus. The built-in multidrop controller and standardized ROM search algorithm allow the bus master to identify, address, and independently toggle each DS2405P+T&R's PIO pin-even in networks with dozens of units-without requiring additional addressing hardware or software overhead.

What is the maximum sink current capability of the DS2405P+T&R's PIO pin?

The DS2405P+T&R's PIO pin provides greater than 4mA sink current at V_OL = 0.4V, verified across the full -40°C to +85°C operating range and 2.8V–6.0V supply. This enables direct driving of indicator LEDs, small-signal relays, optocouplers, or logic inputs without external transistor buffering-reducing bill-of-materials and board area.