What is Dallas DS2431 Chips?

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IC Decrypt

About DS2431 Chips

The DS2431 is a 1-Wire® EEPROM device that is made up of four memory sections, each one having 256 bits. A scratchpad of eight bytes is used to store data, and the data is then copied to the EEPROM. In addition, the four memory sections can be individually switched to EPROM-emulation mode, where bits can only be altered from 1 to 0. The DS2431 communicates using a single wire. The 1-Wire protocol is used for communication.

Dallas DS2431

Features of DS2431

Electronic technical parameters:

  • Power supply voltage: (DC) 5.00 V, 5.25 V (max)
  • Number of pins: 3
  • Access time: 2 µs
  • Memory capacity: 125B
  • Working temperature: -40 ℃~85 ℃
  • Working voltage: 2.8V ~ 5.25V

Package parameters:

  • Installation method: Through Hole
  • Number of pins: 3
  • Package Type: TO-92


  • Length*Width*Height: 4.95 3.94 4.95 mm

International Standard:

  • RoHS Standard: Approved
  • Lead Standard: Lead Free

PIN Configuration

Pin Configuration of DALLAS DS2431
Pin Configuration of DALLAS DS2431

Here are the pin descriptions for the DS2431 based on TO-P2:

  • GND: Ground connection;
  • DQ: 1-Wire Data I/O;
  • NC: All other pins.

The DS2431 communicates over a single wire (DQ) that also serves as both power supply and ground. The DQ pin is bidirectional, and is used to send and receive data between the DS2431 and a host device.

Benefits of DS2431

  1. The DS2431 contains 1024 bits of electrically erasable and programmable ROM partitioned into four pages of 256 bits each.
  2. The ROM-emulation mode allows individual pages to be permanently write-protected or set to EPROM-emulation mode (“write to 0”).
  3. Switchpoint hysteresis and filtering are used to optimize performance in the presence of noise.
  4. The DS2431 is built to withstand voltages from -40°C to +125°C and includes IEC 1000-4-2 Level 4 ESD protection (+8kV contact, +15kV air, typical).
  5. The device communicates with a host using a single digital signal at 15.4kbps via the OneWire protocol.
  6. It also meets the AEC-Q100 Grade 1 quality standard. Standard versions are also available for industrial temperature range (−40°C to +125°C) (DS2431).

Applications of DS2431

  • Analog sensor calibration, including IEEE P1451.4;
  • Accessories/PCB identification, smart sensors;
  • Ink and toner cartridge identification;
  • Automotive sensor identification and calibration;
  • data storage, automotive cable assembly identification.


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About Author

Aidan Taylor
Aidan Taylor

I am Aidan Taylor and I have over 10 years of experience in the field of PCB Reverse Engineering, PCB design and IC Unlock.

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