Overview
The DS24B33Q+T&R , released by Analog Devices (formerly Maxim Integrated), is a 2Kb (256-byte) 1-Wire serial EEPROM memory device . This device communicates over a single bus (1-Wire), requiring only a single data pin and ground line for data read and write, significantly simplifying system wiring and design complexity.
The DS24B33Q+ features low power consumption, a wide operating voltage range, power-down data retention, and excellent reliability . It also includes a built-in unique 64-bit serial number (ROM ID) for easy device identification, authentication, and tracking within the system. It is widely used in industrial equipment, smart sensors, medical instruments, consumer electronics, and accessory authentication .
Core parameters
Parameter | Numerical |
Storage capacity | 2Kb (256 bytes) |
Interface Type | 1-Wire Serial Communication |
unique serial number | 64-bit ROM ID (globally unique) |
Data retention time | >40 years |
Erase and write life | 200,000 times typical |
Operating voltage range | 2.8V ~ 5.25V |
Operating temperature range | –40°C to +85°C |
Communication rate | 16.3kbps (standard mode) / 142kbps (overspeed mode) |
Quiescent current | 2µA (typical, standby) |
Package | 6-pin TDFN (2mm × 3mm) |
Environmental standards | RoHS / Lead-free / REACH compliant |
Features
Single bus communication (1-Wire)
Only one data pin is needed for power supply and communication, saving PCB space and wiring.
Integrated unique serial number (ROM ID)
Each chip is pre-programmed with an independent 64-bit ID when it leaves the factory, which is suitable for anti-counterfeiting authentication and device identification.
High reliability EEPROM storage unit
Data retention is over 40 years and the erase and write endurance is over 200,000 times, making it suitable for long-term embedded applications.
Power-off data protection
Even if there is a power outage, the data can still be kept intact for a long time.
Ultra-low power consumption
With a standby current of only 2µA, it is ideal for battery-powered devices and IoT terminals.
Hardware security features
The unique ID can be used in conjunction with an MCU or security module for anti-counterfeiting authentication, serialization management, and access control.
Typical application scenarios
Equipment and accessories certification
Authentication of consumables, accessories or batteries via a unique ID.
Sensor calibration and identification
Store calibration parameters or sensor serial number for plug-and-play identification.
Industrial and medical equipment
Store device configuration, calibration constants, usage counts, or maintenance records.
Consumer electronics
Used for identification and authorization of smart accessories, replaceable modules, and charging devices.
Data logging and configuration storage
As system parameter EEPROM storage, it is convenient for firmware parameter update and status preservation.
Performance Comparison
Index | DS24B33Q+T&R | DS28E05 (model with safety function) |
Storage capacity | 2Kb | 2Kb |
Communication interface | 1-Wire | 1-Wire |
unique serial number | support | support |
Security authentication function | none | Support SHA-1 authentication |
Operating voltage | 2.8V ~ 5.25V | 2.8V ~ 5.25V |
Erase and write life | 200,000 times | 200,000 times |
Operating temperature | -40°C ~ +85°C | -40°C ~ +85°C |
The DS24B33Q+T&R focuses more on universal and cost-optimized design , while the DS28E05 enhances safety certification.
Manufacturer Profile: Analog Devices (Maxim Integrated)
Analog Devices is a leading global manufacturer of high-performance analog and mixed-signal semiconductors. Its 1-Wire memory and secure authentication chips are widely used in embedded systems, medical electronics, and smart devices. The DS24B33 series is Maxim’s classic 1-Wire EEPROM product, combining low power consumption, reliability, and unique identification.
Why choose DS24B33Q+T&R?
● Single bus communication (1-Wire) simplifies design and wiring
● Integrated unique serial number (64-bit ROM ID) supports identification
● Low power consumption and long data retention life , suitable for battery applications
● High reliability EEPROM (>200,000 erase and write cycles)
● Industrial-grade operating temperature range (–40°C to +85°C)
● Ultra-small package (TDFN-6) suitable for high-density PCBs
Frequently Asked Questions (FAQ)
Q1: Does the DS24B33Q+ support power-off data retention?
A: Yes . The DS24B33Q+ has a built-in 4KB (512 × 8-bit) EEPROM memory cell, which can retain data for over 40 years after a power outage . This device is commonly used in applications requiring power-off protection, such as system parameter storage, serial number recording, or device identification.
Q2: Can 1-Wire communication be performed via GPIO control?
A: Yes . The DS24B33Q+ uses a single 1-Wire bus interface , requiring only a single data line (plus ground). Most MCUs’ general-purpose GPIO ports can implement the 1-Wire protocol through software timing or peripheral emulation. To improve communication stability, it is recommended to connect a pull-up resistor (approximately 4.7kΩ) in parallel to the data line. Pay attention to wiring and grounding design when using long cables or in noisy environments.
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