Analog Devices Inc./Maxim Integrated DS2405Z+T&R

Overview

DS2405Z+T&R from Maxim Integrated (now Analog Devices) 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), 4mA PIO sink capability at 0.4V, operation from 2.8V to 6.0V across –40°C to +85°C, and TSOC-6 surface-mount package. It enables remote on/off control and state sensing of individual nodes in multidrop MicroLAN systems.

For engineers reviewing the DS2405Z+T&R datasheet, DS2405Z+T&R pinout, DS2405Z+T&R application, or DS2405Z+T&R equivalent, this page delivers verified electrical specs, TSOC-6 terminal mapping, 1-Wire protocol timing constraints, parasitic power operation details, and validated alternative parts for industrial node identification and switching.

Technical Context

The DS2405Z+T&R implements a 1-Wire slave interface with embedded ROM search and match logic, enabling bus masters to uniquely identify and individually toggle its PIO output without address decoding overhead. Its internal circuitry includes a parasitic power capacitor and open-drain N-MOSFET driver with 4mA sink current capability at 0.4V.

Communication follows Dallas Semiconductor's standard 1-Wire protocol: all transactions begin with reset/presence pulses (tRSTL ≥480μs, tPDL 60–240μs), followed by ROM function commands (Match ROM 55h, Search ROM F0h, Active-Only Search ECh), and data time slots (tSLOT 60–120μs, tLOWR ≤15μs). The device draws no standby power and operates entirely from bus-derived parasitic energy.

Key Specifications

Pinout & Package

DS2405Z+T&R is supplied in a 6-pin TSOC (Thin Small Outline Carrier) surface-mount package measuring 3.7mm × 4.0mm × 1.5mm, optimized for automated assembly and space-constrained node designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2405Z+T&R, DS2406+T&R adds EEPROM and dual PIOs at higher cost and pin count, while DS2413+T&R offers double the sink current and dual channels with tighter timing - both require board redesign, whereas DS2405Z+T&R delivers verified single-channel functionality in compact TSOC-6 with zero standby power.

Availability

DS2405Z+T&R is available at Aetrix Electronics and suitable for industrial asset tagging, smart building sensor nodes, access control perimeters, and legacy equipment interface applications requiring stable component supply, long-term lifecycle support, and tape-and-reel delivery for SMT production.

Supply support for DS2405Z+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, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The DS2405Z+T&R belongs to Maxim's legacy 1-Wire® addressable switch product line, engineered specifically for distributed identification and low-power remote control in multidrop sensor networks and physical infrastructure monitoring systems.

FAQ

What is the primary function of the DS2405Z+T&R in a 1-Wire network?

The DS2405Z+T&R functions as an addressable open-drain switch node that uses its factory-lasered 64-bit ROM to enable individual identification and remote PIO control on a shared 1-Wire bus. Its core role is to provide deterministic, low-power on/off actuation and state feedback without requiring dedicated address lines or external power - making it ideal for distributed node applications where wiring and power budget are constrained.

Does the DS2405Z+T&R require an external power supply?

No, the DS2405Z+T&R operates exclusively on parasitic power harvested from the 1-Wire bus - it has no V_CC pin and draws zero standby current. During bus high periods, internal capacitance stores energy to sustain operation during low phases. This eliminates the need for local regulators or batteries, simplifying design for maintenance-free deployments such as asset tags or ceiling-mounted sensors.

What package type is used for the DS2405Z+T&R, and how many pins are functional?

The DS2405Z+T&R uses a 6-pin TSOC (Thin Small Outline Carrier) surface-mount package. Only three pins are functional: Pin 1 (GND), Pin 2 (DATA), and Pin 3 (PIO). Pins 4 through 6 are No Connect (NC) - they are unconnected internally and must remain floating in the PCB layout per the official datasheet.

How does the DS2405Z+T&R support multiple devices on the same 1-Wire bus?

The DS2405Z+T&R supports multidrop operation via its embedded 1-Wire search and match logic. Bus masters use Search ROM (F0h) to discover all connected DS2405Z+T&R units by their unique 64-bit ROMs, then issue Match ROM (55h) commands to individually toggle or read the PIO state of any specific device - all without address conflicts or additional hardware.

What is the maximum sink current capability of the DS2405Z+T&R's PIO pin?

The DS2405Z+T&R's PIO pin provides ≥4mA sink current at a maximum output voltage (V_OL) of 0.4V, as specified in the DC Electrical Characteristics table. This allows direct interfacing with common indicator LEDs, small relays, or logic-level inputs without external buffering - a key design advantage for space- and cost-sensitive node implementations.