Analog Devices Inc./Maxim Integrated DS2405Z+

Overview

DS2405Z+ from Maxim Integrated is an addressable 1-Wire® open-drain N-channel switch with factory-lasered 64-bit ROM (8-bit family code 05h, 48-bit serial number, 8-bit CRC), 4mA sink capability at 0.4V, operation from 2.8V to 6.0V, and -40°C to +85°C temperature range - used for node-level identification and remote PIO control in distributed sensor networks.

For engineers reviewing the DS2405Z+ datasheet, DS2405Z+ pinout, DS2405Z+ application, or DS2405Z+ equivalent, this page delivers verified electrical specs, TSOC package pin mapping, 1-Wire protocol behavior, parasitic power operation, and real-world alternatives for MicroLAN-based industrial control and asset tagging systems.

Technical Context

The DS2405Z+ implements a 1-Wire slave interface with embedded multidrop controller logic, enabling bus enumeration via Search ROM and device-specific control via Match ROM commands. Its PIO pin functions as a controllable open-drain output whose state can be both set and read over the same bidirectional data line.

It operates entirely from parasitic power harvested from the 1-Wire bus, requiring no external V_CC, and uses standard Dallas Semiconductor timing: reset pulse ≥480μs, time slot 60–120μs, and presence detection window of 15–60μs high followed by 60–240μs low.

Key Specifications

Pinout & Package

DS2405Z+ is supplied in a 4-pin SOT-223 surface-mount package with thermal pad exposed on bottom. Pin 1 is Ground, Pin 2 is Data (bidirectional 1-Wire bus), Pin 3 is PIO (open-drain output), and Pin 4 is Ground - dual ground pins improve noise immunity and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2405Z+, DS2413+ offers dual outputs and stronger drive but loses parasitic operation, while DS2406+ adds EEPROM and dual PIO in TSOC-6 - making DS2405Z+ optimal for cost-sensitive, single-output, zero-power-supply node identification and control.

Availability

DS2405Z+ is available at Aetrix Electronics and suitable for industrial asset tagging, smart building sensor nodes, access control peripherals, and legacy equipment retrofit requiring stable component supply and long-term MicroLAN compatibility.

Supply support for DS2405Z+ 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, communications, and computing applications.

The DS2405Z+ belongs to Maxim's 1-Wire addressable switch product line, engineered specifically for distributed identification and low-overhead remote control in resource-constrained MicroLAN systems.

FAQ

What is the function of the PIO pin on the DS2405Z+?

The PIO pin on the DS2405Z+ is an open-drain N-channel MOSFET output that can be individually toggled on or off via 1-Wire Match ROM command. It sinks ≥4mA at 0.4V and supports readback of its logic state over the same bus - enabling both control and verification without additional hardware. The DS2405Z+ PIO requires an external pullup resistor to define the high state.

Does the DS2405Z+ require an external power supply?

No, the DS2405Z+ operates entirely from parasitic power drawn from the 1-Wire bus. It stores energy on an internal capacitor during bus high periods and uses that stored charge to power internal logic and drive the PIO during low periods. No external V_CC connection is needed - simplifying wiring and reducing BOM count.

How does the DS2405Z+ achieve unique device identification?

The DS2405Z+ contains a factory-lasered 64-bit ROM comprising an 8-bit family code (05h), a unique 48-bit serial number, and an 8-bit CRC. This ROM is permanently programmed and tested - ensuring no two DS2405Z+ units share the same identifier. The CRC validates integrity during ROM read operations, preventing misidentification due to bus noise or corruption.

Can multiple DS2405Z+ devices share the same 1-Wire bus?

Yes, multiple DS2405Z+ devices can coexist on a single 1-Wire bus. The DS2405Z+ includes built-in multidrop controller logic and supports standard 1-Wire search algorithms (Search ROM, Active-Only Search ROM) to enumerate, address, and independently control each unit - even when dozens are present on one data line.

What package type is used for the DS2405Z+?

The DS2405Z+ is packaged in a 4-pin SOT-223 surface-mount package with exposed thermal pad. Pin 1 and Pin 4 are both Ground, Pin 2 is Data (1-Wire bidirectional), and Pin 3 is PIO (open-drain output). This layout enhances thermal performance and noise immunity compared to TO-92 or TSOC variants.