iButton High-Density Temperature Logger with 122KB Data-Log Memory

Provides High-Quality Temperature Exposure Records of an End Product or Process

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The iButton® temperature logger (DS1925) is a rugged, self-sufficient system that measures temperature and records the result in a protected memory section. The recording is done at a user-defined rate. A total of 122K 8-bit readings or 61K 16-bit readings taken at equidistant intervals ranging from 5min to 273hrs can be stored. In addition, there are 512 bytes of nonvolatile memory for storing application-specific information. A mission to collect data can be programmed to begin immediately, after a user-defined delay, or after a temperature alarm. Access to the memory and control functions can be password protected. The DS1925 is configured and communicates with a host computing device through the serial 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1925 is factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel package is highly resistant to environmental hazards such as dirt, moisture, and shock. Accessories permit the DS1925 to be mounted on almost any object, including containers, pallets, and bags.
DS1925: Block Diagram DS1925: Block Diagram Enlarge+

Key Features

  • Provides High-Quality Temperature Exposure Assessment of an End Product
    • Temperature Measurement Accuracy of ±0.5°C with Storage for Up to 125,440 Timestamped Values
    • Flexibility to Monitor and Data-Log Long Duration Exposures with Short-Duration Time Intervals
    • Unique Factory-Lasered 64-Bit Serial Number Ensures Absolute Traceability Because No Two Parts Are Alike
  • Highly Configurable Options for Data Logging and Security
    • Programmable Sample Rates from 5min to 273hrs
    • Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
    • Two-Level Password Protection of All Memory and Configuration Registers
    • Measure and Report Internal Battery Level and Output-Logged Data if a Battery is Depleted
  • Physically Robust, Operationally Efficient
    • Durable Stainless-Steel Enclosure Withstands Harsh Environments and Conditions
    • Communicates to a Host System with the Single-Contact 1-Wire Interface
    • -40°C to +85°C Operating Temperature Range


  • Bio Science
  • Food Safety
  • Pharmaceutical and Medical Products High-Temperature Logging (Process Monitoring, Industrial Monitoring)
  • Temperature Logging in Cold Chain
Part NumberInterfaceTechnologyApplicationsUsageMemory TypeMemory SizeData Logger TypeTemp. Readings Oper. Temp.
See Notes
DS1925L 1-WireiButton
Industrial Monitoring
Process Monitoring
Shipment Logistics
Multi UseFlash512 BytesTemperature125440-40 to +85$49.77 @1k
See All Data Loggers (9)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

DS1925EVKIT: Evaluation Kit for the DS1925

Technical Documents

User Guide 3358 OneWireViewer User's Guide, Version 1.5
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks

Quality and Environmental Data

Request Reliability Report for: DS1925 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

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