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Microchip Technology AT24CSW020-STUM-T
- Part No.:
- AT24CSW020-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24CSW020-STUM-T.pdf
- Description:
- IC EEPROM 2KBIT I2C TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,436
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Product details
Overview
AT24CSW020-STUM-T from Microchip Technology is a 2-Kbit (256 × 8) I²C-compatible serial EEPROM with integrated security register, software write protection, and ultra-low power operation (1.7V–3.6V). It features a factory-programmed 128-bit unique serial number, 16 bytes of user-programmable security EEPROM, and hardware write-protect pin for industrial-grade data integrity in embedded systems.
For engineers reviewing the AT24CSW020-STUM-T datasheet, AT24CSW020-STUM-T pinout, AT24CSW020-STUM-T application, or AT24CSW020-STUM-T equivalent, this device supports I²C Fast Mode Plus (1 MHz), offers 1,000,000 write cycles, 100-year data retention, and operates across -40°C to +85°C - critical for secure boot, calibration storage, and tamper-resistant configuration in space-constrained IoT nodes.
Technical Context
The AT24CSW020-STUM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SCL/SDA inputs and open-drain SDA output requiring external pull-up. It uses internal high-voltage generation for EEPROM programming and includes a dedicated hardware address decoder supporting multiple client addresses on shared buses.
Its memory architecture separates main 2-Kbit EEPROM (256 × 8) from a 256-bit security register containing preprogrammed 128-bit serial number plus 16-byte user-writable section. Software write protection supports five configurable levels, with optional permanent locking - all managed via standard I²C commands without additional control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8), organized as 256 words of 8 bits - sufficient for firmware versioning, sensor calibration tables, or device identity storage. |
| Supply Voltage | 1.7V to 3.6V - enables direct interfacing with 1.8V/2.5V/3.3V microcontrollers without level shifters. |
| I²C Speed Modes | Standard (100 kHz), Fast (400 kHz), Fast Mode Plus (1 MHz) - supports high-throughput configuration updates in real-time systems. |
| Write Endurance | 1,000,000 cycles - ensures reliable logging or parameter adjustment over product lifetime in field-deployed equipment. |
| Data Retention | 100 years at +55°C - guarantees long-term validity of cryptographic keys or calibration coefficients without refresh. |
| Standby Current | 0.8 μA max at 3.6V - minimizes battery drain in always-on edge sensors and wearable devices. |
| Security Register | 256-bit total: 128-bit factory-locked serial number + 16-byte user-programmable EEPROM - enables secure device authentication and irreversible credential storage. |
Pinout & Package
AT24CSW020-STUM-T is packaged in a 5-lead SOT23 surface-mount package with exposed pad (STUM suffix per Microchip's ordering code convention). This compact 2.9 mm × 1.6 mm footprint supports high-density PCB layouts in portable electronics and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | Serial Clock Input | Asynchronous clock line driven by host MCU; rising edge latches input data, falling edge outputs data - requires external pull-up resistor (≤10 kΩ). |
| GND | Ground Reference | System ground return path for VCC and I/O; must be low-impedance connection to minimize noise coupling into sensitive EEPROM operations. |
| SDA | Bidirectional Serial Data | Open-drain I/O shared across I²C bus; supports wire-OR with other devices; requires external pull-up and must not exceed 10 kΩ. |
| VCC | Power Supply Input | 1.7V–3.6V supply rail; slew rate ≤0.1 V/µs required during power-up to ensure proper POR behavior and avoid spurious writes. |
| WP | Hardware Write-Protect | Active-high enable: tied to VCC to lock full array + security register; tied to GND for normal writes; internally pulled down if floating - recommended to tie to known state. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed 128-bit Serial Number | Uniquely identifies each unit at wafer level - eliminates need for post-manufacturing serialization in production test flow. |
| Software-Configurable Write Protection | Five programmable protection levels (including permanent lock) - allows flexible security policy deployment without hardware changes. |
| Ultra-Low Standby Current (0.8 μA) | Enables multi-year battery life in energy-harvesting or coin-cell-powered applications where EEPROM access is infrequent. |
| ESD Robustness (>4 kV) | Withstands handling and system-level ESD events per HBM - reduces field failure risk in unshielded consumer and industrial enclosures. |
| Industrial Temperature Range (-40°C to +85°C) | Validated operation across full range - suitable for automotive cabin modules, smart meters, and outdoor infrastructure equipment. |
Applications
| Secure Boot Configuration | Calibration Data Storage |
|---|---|
Use Scenario: Storing immutable public keys, hash digests, and boot policy flags in edge gateways before firmware execution. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during early boot sequence; provides root-of-trust anchor for verified boot chain. Use Value: Prevents unauthorized firmware modification using factory-programmed serial number and permanently locked security register contents. | Use Scenario: Recording sensor offset/gain values after factory calibration in medical wearables and industrial transmitters. IC Role / Device Role / Timing Role: High-reliability parameter archive with 100-year retention; updated only during calibration procedure, read on every power-up. Use Value: Eliminates recalibration labor and ensures measurement accuracy traceability across product lifetime. |
| Device Identity Management | Tamper-Resistant Settings Storage |
Use Scenario: Embedding unique device IDs and manufacturing lot codes in smart home hubs and asset trackers. IC Role / Device Role / Timing Role: Serialized identity source used by cloud provisioning services; accessed once per device registration. Use Value: Leverages preprogrammed 128-bit serial number - removes serialization step from production line and guarantees global uniqueness. | Use Scenario: Saving user-configured security policies (e.g., admin password hashes, access control lists) in network switches and IP cameras. IC Role / Device Role / Timing Role: Protected settings repository with hardware/software dual-write protection preventing accidental or malicious overwrite. Use Value: WP pin + software lock prevents runtime corruption while allowing authorized updates via authenticated host commands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with security register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CSW020-SSHM-T | Same die, 4-ball WLCSP package (0.87 mm × 0.87 mm); no WP pin; relies solely on software write protection. | Used where board area is critical and hardware write-protect is unnecessary; lacks physical WP pin for fail-safe lock. | Select when ultra-miniature footprint is mandatory and WP functionality can be implemented in firmware. |
| M95M02-DFMN6TP | 2-Mbit SPI EEPROM (not I²C); no security register; 1.8V–5.5V supply; 5 ms write cycle; 400 kHz SPI clock max. | Requires SPI interface redesign; lacks factory serial number and user-programmable security space. | Choose only if existing design uses SPI bus and security requirements are limited to basic write protection. |
Compared with AT24CSW020-STUM-T, the AT24CSW020-SSHM-T saves board area but removes hardware-level write protection, while the M95M02-DFMN6TP necessitates interface change and forfeits security register capabilities - making AT24CSW020-STUM-T the sole option combining I²C compatibility, physical WP pin, and factory-serialized security in SOT23.
Availability
AT24CSW020-STUM-T is available at Aetrix Electronics and suitable for secure boot configuration, calibration data archiving, device identity management, and tamper-resistant settings storage requiring stable component supply across extended product lifecycles.
Supply support for AT24CSW020-STUM-T 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT24CSW02X family was designed specifically for secure, low-power, space-constrained embedded systems requiring guaranteed device uniqueness and protected nonvolatile storage - targeting IoT endpoints, medical devices, and industrial controllers.
FAQ
What is the memory organization of the AT24CSW020-STUM-T?
The AT24CSW020-STUM-T contains 2,048 bits of EEPROM organized as 256 words × 8 bits. It also includes a dedicated 256-bit security register: the first 128 bits hold a factory-programmed, globally unique serial number, and the remaining 16 bytes (128 bits) are user-programmable. The AT24CSW020-STUM-T supports both byte and 8-byte page write modes with self-timed write cycles completing in ≤5 ms.
Does the AT24CSW020-STUM-T support I²C Fast Mode Plus?
Yes, the AT24CSW020-STUM-T fully supports I²C Fast Mode Plus at up to 1 MHz across its entire 1.7V–3.6V supply range. This capability enables faster configuration updates compared to standard (100 kHz) or fast mode (400 kHz) - critical for time-sensitive applications like dynamic parameter loading in motor controllers or real-time sensor fusion engines using the AT24CSW020-STUM-T.
How does hardware write protection work on the AT24CSW020-STUM-T?
The AT24CSW020-STUM-T uses a dedicated WP pin: when pulled high to VCC, it disables all write operations to both the main EEPROM array and the security register. When grounded, normal writes are enabled. If left floating, the pin is internally pulled down - but Microchip recommends tying it to a defined logic level to prevent noise-induced misoperation. This hardware lock complements software-based protection for defense-in-depth security in the AT24CSW020-STUM-T.
What is the purpose of the security register in the AT24CSW020-STUM-T?
The security register in the AT24CSW020-STUM-T serves two purposes: first, it holds a factory-programmed, globally unique 128-bit serial number that requires no post-production programming; second, it provides 16 bytes of user-writable EEPROM that can be independently write-protected. This structure enables secure device identification and irreversible storage of cryptographic keys or credentials - core functions for trusted execution environments relying on the AT24CSW020-STUM-T.
Is the AT24CSW020-STUM-T RoHS compliant and halogen-free?
Yes, the AT24CSW020-STUM-T is manufactured in a green package meeting RoHS Directive 2011/65/EU requirements and is both lead-free and halide-free. Its SOT23 package uses matte tin (Sn) termination finish and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) - ensuring compatibility with standard reflow profiles and environmental compliance for global electronics manufacturing using the AT24CSW020-STUM-T.
AT24CSW020-STUM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 450 ns
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
AT24CSW020-STUM-T FAQ
1.How can I place an order for AT24CSW020-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CSW020-STUM-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT24CSW020-STUM-T reliable?
The price and inventory of AT24CSW020-STUM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CSW020-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24CSW020-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CSW020-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CSW020-STUM-T?
AT24CSW020-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CSW020-STUM-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT24CSW020-STUM-T?
For technical support, including AT24CSW020-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CSW020-STUM-T requirements.
6.How does Aetrix verify that AT24CSW020-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24CSW020-STUM-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT24CSW020-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24CSW020-STUM-T?
All AT24CSW020-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CSW020-STUM-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT24CSW020-STUM-T part is unused and in its original packaging.
Return procedure for AT24CSW020-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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