Analog Devices Inc./Maxim Integrated DS2405P+

Overview

DS2405P+ 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), 4mA PIO sink capability at 0.4V, operates from 2.8V to 6.0V across -40°C to +85°C, and communicates at up to 16.3kbits/s - used for remote node identification and control in distributed sensor networks and access control systems.

For engineers reviewing the DS2405P+ datasheet, DS2405P+ pinout, DS2405P+ application, or DS2405P+ equivalent, key selection considerations include its parasitic-power operation, multidrop 1-Wire bus compatibility, PIO state sensing capability, and TSOC-6 package footprint for surface-mount industrial node design.

Technical Context

The DS2405P+ implements a 1-Wire slave interface with embedded ROM search and Match ROM logic, enabling unique device singulation on shared buses without external addressing. Its internal circuitry includes a parasitic power capacitor, bidirectional data timing control, and open-drain PIO output driven by an internal CONTROL signal derived from ROM-matched commands.

Communication follows Dallas Semiconductor's standard 1-Wire protocol: initialization via Reset/Presence pulses, ROM function command execution (Read ROM, Match ROM, Search ROM, Active-Only Search ROM), and PIO state toggling or read-back using time-slot–based write/read sequences - all over a single wire with 5kΩ pullup.

Key Specifications

Pinout & Package

DS2405P+ is housed in a 6-pin TSOC (Thin Small Outline Carrier) surface-mount package measuring 3.7mm × 4.0mm × 1.5mm, optimized for compact PCB layouts in space-constrained sensor nodes and iButton-compatible accessories.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2413+ and DS2406+, the DS2405P+ delivers minimal-footprint, single-channel 1-Wire switching with lowest unit cost and smallest TSOC-6 footprint - ideal for high-volume, functionally focused node designs where EEPROM or dual outputs are unnecessary.

Availability

DS2405P+ is available at Aetrix Electronics and suitable for industrial sensor networks, access control systems, and asset tracking solutions requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.

Supply support for DS2405P+ 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 DS2405P+ belongs to Maxim's 1-Wire addressable switch product line, engineered specifically for low-cost, single-wire distributed control and identification in harsh or space-constrained environments.

FAQ

What is the primary function of the DS2405P+ in a 1-Wire system?

The DS2405P+ functions as an addressable open-drain switch that enables remote control and state sensing of a single load over a 1-Wire bus. Its 64-bit ROM allows unique identification among multiple devices on the same bus, and its PIO pin can be toggled or read back using Match ROM or Search ROM commands - making DS2405P+ essential for distributed node control without dedicated address lines.

Does the DS2405P+ require an external power supply?

No, the DS2405P+ operates with parasitic power - it draws energy from the 1-Wire bus during high-voltage intervals and stores it on an internal capacitor to sustain operation during low-voltage periods. This eliminates the need for a separate V_CC connection, simplifying wiring and reducing bill-of-materials cost in DS2405P+ deployments.

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

The DS2405P+ uses a 6-pin TSOC package, whereas DS2405Z uses a 4-pin SOT-223 and DS2405 uses a TO-92 through-hole package. All share identical electrical specifications, ROM structure, and 1-Wire protocol behavior - only mechanical form factor and thermal characteristics differ. The "+" suffix denotes Maxim's enhanced-reliability screening grade applicable to all three packages.

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

Yes, multiple DS2405P+ devices can coexist on a single 1-Wire bus. The built-in multidrop controller and standardized ROM search algorithm allow a bus master to uniquely identify, address, and control each DS2405P+ independently - even when dozens are present - using Match ROM or Active-Only Search ROM commands.

What is the maximum sink current capability of the DS2405P+ PIO pin?

The DS2405P+ PIO pin provides ≥4mA sink current at 0.4V, verified across the full operating temperature range (-40°C to +85°C) and supply voltage range (2.8V to 6.0V). This specification ensures reliable drive of indicator LEDs, small-signal relays, or logic-level inputs without external amplification - a confirmed performance metric for DS2405P+ in production applications.