Analog Devices Inc./Maxim Integrated DS2401Z+

DS2401Z Silicon Serial Number IC Comprehensive Summary

The DS2401Z, produced by Analog Devices Inc./Maxim Integrated, is a compact silicon serial number device designed to provide unique identification within electronic systems. Featuring a guaranteed unique 64-bit ROM ID, the DS2401Z serves as a robust solution for component tracking, equipment registration, and secure system authentication. Its SOT-223 surface-mount package ensures easy integration into modern high-density printed circuit boards, making it highly suitable for a wide array of electronic hardware applications ranging from network node identification to PCB serialization.

Main Characteristics of the DS2401Z

Central to the DS2401Z is its minimalist interface, built around the industry-standard 1-Wire® protocol, which simplifies wiring and reduces system complexity by requiring only a single data pin and ground. The device stores a 64-bit ROM, partitioned into an 8-bit family code, a 48-bit unique serial number, and an 8-bit CRC for error checking, ensuring absolute traceability with each device.

Engineers benefit from the device’s built-in multidrop controller, which allows multiple DS2401Z devices to operate concurrently on a shared 1-Wire bus. This enables applications such as inventory tracking or distributed access control. The device supports data transfer at speeds up to 16.3 kbps, helping maintain system responsiveness in high-throughput environments.

The DS2401Z is designed for industrial use cases, operating over a wide voltage range of 2.8V to 6.0V and within an extended temperature window from -40°C to +85°C. Notably, it requires zero standby power, an advantage for battery-operated and energy-sensitive systems.

DS2401Z Packaging Types and Physical Specifications

The DS2401Z is available in several package types, with the SOT-223-3 package (TO-261-4, TO-261AA) being particularly notable for surface-mount assembly. This small footprint is appropriate for automated assembly lines and high-density PCB layouts commonly found in modern electronics. Pin allocation is streamlined for integration: the standard pinout includes a data (DQ) line, a ground (GND) connection, and no connection (NC). Additionally, the DS2401Z series is available in configurations suitable for varied lead forms and packaging requirements.

Operating Mechanism and 1-Wire Interface System of DS2401Z

At the heart of DS2401Z operation is the 1-Wire communication protocol, requiring only a single open-drain data line alongside ground. The device functions as a bus peripheral, responding to queries from a system microcontroller acting as the 1-Wire master.

Effective integration calls for careful consideration of bus hardware configuration. The DS2401Z, being open-drain, expects a pull-up resistor at the controller side, with recommended values between 1.5kΩ and 5kΩ, depending on cable length and bus load. This resistor ensures reliable data line restoration during idle states. The signaling protocol specifies stringent timing for reset and presence pulses, ensuring reliable identification and communication — impressive given the absence of an external power source, as the DS2401Z parasitically powers itself from the data line during bus activity.

A key benefit in multi-device networks is the DS2401Z’s multidrop compatibility: multiple devices can be attached to one bus, and the system can uniquely identify each one using a ROM search algorithm.

In-depth Functionality Memory Layout, Communication Protocol, and Command Set of DS2401Z

The DS2401Z’s internal nonvolatile memory is structured as a fixed 64-bit ROM, which comprises the following sections:

8-bit family code (identifying device type)

48-bit unique serial number (assigned at manufacture)

8-bit CRC (Cyclic Redundancy Check for data integrity)

Interaction with the DS2401Z involves a two-stage communication: initialization and data transaction. Communications start with a bus reset issued by the controller, to which the DS2401Z responds with a specialized 'Presence Pulse', confirming its readiness.

The device supports fundamental ROM-level commands:

Read ROM (33h): Reads out the full ROM contents, appropriate when a single device resides on the bus.

Search ROM (F0h): Employs a binary search to enumerate all devices and their ROM IDs on a shared bus.

Legacy Read ROM (0Fh): Provided for backward compatibility, though not supported in newer DS2401A versions.

Match ROM and Skip ROM commands, present in the wider 1-Wire device family, are not applicable to the DS2401Z as it does not support memory beyond its unique ROM portion.

Use Cases and Engineering Design Points for DS2401Z

The DS2401Z excels in PCB and product serialization, network node identification, and applications where reliable traceability is mandated, such as in sensitive or regulated industries. For instance, embedding a DS2401Z in a network module or industrial asset ensures each unit carries an immutable unique ID, simplifying installation tracking, lifecycle management, and automated registration.

Engineers should account for multidrop behavior in shared-bus topologies, ensuring the controller’s software stack implements the full 1-Wire search routine for device enumeration. The choice of pullup resistor should be matched to the physical configuration of the system; longer buses with higher capacitance require lower resistor values to maintain signal integrity at maximum data rates.

DS2401Z Environmental Ratings, Compliance Certifications, and Reliability Information

The DS2401Z is designed to be robust under industrial conditions with its -40°C to +85°C operating temperature. However, it is worth noting that certain versions of the DS2401Z are not RoHS compliant. System designers must verify the particular device’s lead status and environmental compliance for their application’s regulatory requirements.

The moisture sensitivity level (MSL) is specified as 1 (unlimited), advantageous for standard assembly processes. Additionally, the device holds a REACH unaffected status and an ECCN of EAR99, allowing broad international shipment with minimal regulatory concerns.

Alternative and Replacement Options for the DS2401Z

As the DS2401Z has reached obsolete status, design engineers and component buyers should consider alternative solutions for new projects or supply chain continuity. Compatible or improved models from Analog Devices Inc./Maxim Integrated include packages such as the DS2401 in other form factors (TO-92, TSOC, WLP, Flip Chip), which offer the same silicon serial number technology. For systems upgrading from the earlier DS2400, the DS2401Z maintains full reverse compatibility and adds multidrop support. When selecting a replacement or alternative, key considerations include package compatibility, voltage and temperature tolerances, unique ID structure, and software compatibility with established 1-Wire protocol stacks.

Conclusion

: Selecting the Right Serial Number IC for System Integration

The DS2401Z silicon serial number IC embodies a compact, robust, and industry-proven method for embedding unique identification in electronic systems. Its streamlined 1-Wire interface, multidrop capability, and wide operating envelope make it a prime candidate for diverse applications — from asset tagging to network equipment registration. As the DS2401Z approaches end-of-life status, engineers and buyers are encouraged to proactively evaluate available equivalents within the same technology family, ensuring uninterrupted device authenticity and system traceability for new and legacy deployments.