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Microchip Technology AT24CSW040-UUM0B-T
- Part No.:
- AT24CSW040-UUM0B-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
AT24CSW040-UUM0B-T.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
AT24CSW040-UUM0B-T from Microchip Technology (formerly Atmel) is a 4-Kbit I²C-compatible serial EEPROM with integrated security register, software write protection, and ultra-thin 4-ball WLCSP package. It delivers 512 × 8-bit memory organization, 1.7V–3.6V operation, 1MHz Fast Mode Plus interface, and factory-programmed 128-bit unique serial number for device authentication in space-constrained embedded systems.
For engineers reviewing the AT24CSW040-UUM0B-T datasheet, AT24CSW040-UUM0B-T pinout, AT24CSW040-UUM0B-T application, or AT24CSW040-UUM0B-T equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for secure, low-voltage, high-reliability nonvolatile storage in industrial IoT nodes, medical wearables, and trusted firmware bootloaders.
Technical Context
The AT24CSW040-UUM0B-T operates as an I²C slave device with fixed hardware slave address A0h (binary 1010_0000), determined by preprogrammed A2=0/A1=0 pins. Its dual-memory architecture separates the main 4-Kbit EEPROM array (000h–1FFh) from a dedicated 32-byte Security Register (80h–9Fh), accessed via distinct device type identifiers (1010b vs. 1011b).
It implements Schmitt-triggered, filtered SDA/SCL inputs for noise immunity, supports byte/page/sequential writes with 16-byte page boundaries, and features self-timed internal write cycles ≤5ms. The Security Register includes 16 bytes of read-only factory-serialized data and 16 bytes of user-programmable memory-both permanently lockable via software command without external hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8 bits), organized as 32 pages of 16 bytes - enables efficient firmware parameter storage with minimal bus overhead. |
| Supply Voltage | 1.7V to 3.6V - supports direct interfacing with modern ultra-low-power MCUs (e.g., ARM Cortex-M0+, RISC-V) without level-shifting. |
| I²C Speed Modes | 100kHz (Standard), 400kHz (Fast), and 1MHz (Fast Mode Plus) - ensures compatibility across legacy and high-throughput host controllers. |
| Security Register | 256-bit total: 128-bit factory-programmed unique serial number (read-only, guaranteed across CS Series) + 16 bytes user EEPROM - eliminates need for external serialization in production test flows. |
| Write Endurance | 1,000,000 cycles - suitable for dynamic calibration data logging in field-deployed sensors and actuators. |
| Data Retention | 100 years at +25°C - meets long-lifecycle requirements for medical devices, energy meters, and infrastructure monitoring systems. |
| Active/Standby Current | ≤1mA active, ≤0.8μA standby - minimizes battery drain in always-on edge nodes and portable diagnostics equipment. |
Pinout & Package
AT24CSW040-UUM0B-T uses a 4-ball Ultra-Thin Wafer-Level Chip Scale Package (WLCSP), footprint code 4U-13, with 0.4mm pitch and bottom-side solder bumps. This package enables <0.8mm² board area usage and is RoHS-compliant, halide-free, and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.7V–3.6V; internal voltage regulation enables stable EEPROM operation across wide battery discharge curves. |
| GND | Ground reference | Must be connected to system ground plane; shared return path for all internal logic and charge-pump circuits. |
| SCL | Serial clock input | Input-only, Schmitt-triggered, requires external pull-up; controls timing of all I²C data transfers (latch on rising edge). |
| SDA | Serial data bidirectional I/O | Open-drain, Schmitt-triggered, requires external pull-up ≤10kΩ; supports multi-drop bus topology with wire-OR capability. |
Key Features
| Feature | Design Value |
|---|---|
| Software Write Protection | Five configurable protection levels (none, quarter, half, three-quarter, full array) - allows selective locking of calibration tables while leaving runtime counters writable. |
| Factory-Serialized Security Register | Guaranteed unique 128-bit serial number programmed during wafer sort - removes post-silicon serialization cost and risk in high-volume manufacturing. |
| User-Programmable Lockable Memory | 16-byte region in Security Register that can be permanently write-protected via software command - ideal for storing cryptographic keys or device-specific credentials. |
| Ultra-Low Power Operation | 0.8μA max standby current at 3.6V - extends shelf life and operational runtime in coin-cell-powered asset trackers and smart patches. |
| Robust Bus Interface | Schmitt-triggered inputs with integrated noise filtering - maintains reliable communication in electrically noisy environments (e.g., motor drives, power supplies). |
Applications
| Medical Wearables | Industrial Sensor Nodes |
|---|---|
Use Scenario: Storing patient-specific calibration coefficients, firmware version stamps, and usage logs in disposable ECG patches and glucose monitors. IC Role / Device Role: Secure, low-voltage nonvolatile memory for tamper-resistant configuration and audit trail storage. Use Value: Factory-programmed serial number enables per-unit traceability without adding test station complexity; 100-year data retention ensures compliance with medical device lifecycle regulations. |
Use Scenario: Logging temperature/humidity/pressure sensor offsets, factory calibration data, and firmware update metadata in wireless environmental sensors deployed outdoors. IC Role / Device Role: Trusted parameter storage with permanent write protection for critical calibration values. Use Value: Software-lockable Security Register prevents accidental overwrites during field firmware updates; 1M-cycle endurance supports decades of recalibration events. |
| Trusted Boot Systems | Smart Energy Meters |
Use Scenario: Holding public key hashes, secure boot policy flags, and anti-rollback counters in microcontroller-based edge gateways and secure MCU subsystems. IC Role / Device Role: Immutable root-of-trust anchor for cryptographic verification of bootloader integrity. Use Value: Read-only 128-bit serial number serves as hardware-unique identifier for key binding; permanent lock capability ensures boot policy cannot be altered post-deployment. |
Use Scenario: Storing tariff schedules, metering history, tamper-detection flags, and utility-specific configuration in ANSI C12.22-compliant smart meters. IC Role / Device Role: High-reliability, low-power EEPROM for regulatory-grade data persistence under extended temperature and humidity stress. Use Value: 1.7V minimum VCC supports operation during brown-out conditions; RoHS/halide-free WLCSP meets global environmental compliance mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CSW040-SSHM-T | Same 4-Kbit capacity, identical Security Register and write protection features, but in 8-lead SOIC package (3.9mm × 4.9mm) instead of 4-ball WLCSP. | Used where manual rework, visual inspection, or socket-based prototyping is required - not suitable for ultra-dense PCB layouts. | Select when board-level assembly constraints favor through-hole or gull-wing packaging over chip-scale integration. |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (not I²C), no factory-serialized Security Register, 1.8V–5.5V supply, 20MHz SPI interface. | Applicable where host MCU lacks I²C or requires higher bandwidth; lacks built-in serialization and hardware-assisted write protection granularity. | Choose only if SPI interface is mandatory and external serialization logic can be added; not drop-in compatible due to protocol and feature mismatch. |
Compared with AT24CSW040-SSHM-T, the AT24CSW040-UUM0B-T reduces footprint by >95% and enables direct die-level integration, while retaining identical security and reliability specs; versus M95M04-DRMN6TP/K, it offers native I²C simplicity, guaranteed uniqueness, and finer-grained software protection - critical for secure identity management.
Availability
AT24CSW040-UUM0B-T is available at Aetrix Electronics and suitable for medical wearables, industrial sensor nodes, trusted boot systems, and smart energy meters requiring stable component supply, long-term lifecycle assurance, and certified RoHS/halide-free packaging.
Supply support for AT24CSW040-UUM0B-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 acquired Atmel in 2016 and maintains full product continuity, documentation, and support for the AT24CSW series. Microchip is a leading provider of microcontrollers, analog, and memory solutions for industrial, automotive, and communications markets.
The AT24CSW040-UUM0B-T belongs to Microchip's CS Series Serial EEPROM family, designed specifically for secure, low-voltage, space-constrained applications requiring factory-unique identification and irreversible data protection - targeting next-generation IoT endpoints and safety-critical embedded systems.
FAQ
What is the hardware slave address of the AT24CSW040-UUM0B-T?
The AT24CSW040-UUM0B-T has a fixed hardware slave address of 0xA0 (10100000b) for main EEPROM access, determined by factory-programmed A2=0 and A1=0 pins. The Security Register uses device type identifier 0xB0 (10110000b). No external address pins are exposed - the address is embedded in the ordering code and cannot be modified.
Does the AT24CSW040-UUM0B-T support 1MHz I²C communication?
Yes, the AT24CSW040-UUM0B-T fully supports Fast Mode Plus (FM+) at up to 1MHz across its entire 1.7V–3.6V operating range. This is confirmed in the official datasheet (Atmel-47001B, Section "Features") and enables faster parameter loading in time-sensitive applications like real-time sensor fusion engines.
Can the 128-bit serial number in the AT24CSW040-UUM0B-T be rewritten?
No - the 128-bit serial number in the AT24CSW040-UUM0B-T is factory-programmed during wafer sort and permanently locked. It resides in the first 16 bytes of the Security Register (addresses 80h–8Fh) and is read-only for the lifetime of the device. This guarantee applies across the entire CS Series, ensuring global uniqueness.
How is write protection configured on the AT24CSW040-UUM0B-T?
Write protection on the AT24CSW040-UUM0B-T is controlled via an 8-bit Write Protect Register using five software-configurable levels: none, quarter-array, half-array, three-quarter-array, or full-array protection. Configuration is performed by writing to specific addresses in the Security Register; settings can be made permanent with a dedicated lock command sequence.
What package type does the AT24CSW040-UUM0B-T use?
The AT24CSW040-UUM0B-T uses a 4-ball Ultra-Thin Wafer-Level Chip Scale Package (WLCSP), package code 4U-13, with 0.4mm ball pitch and bottom-side solder bumps. This package measures approximately 0.76mm × 0.76mm and is lead-free, halide-free, and RoHS-compliant - optimized for miniaturized PCB designs.
AT24CSW040-UUM0B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 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:
- 4-WLCSP
AT24CSW040-UUM0B-T FAQ
1.How can I place an order for AT24CSW040-UUM0B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CSW040-UUM0B-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 AT24CSW040-UUM0B-T reliable?
The price and inventory of AT24CSW040-UUM0B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CSW040-UUM0B-T is usually 5 days.
3.What payment methods are accepted for AT24CSW040-UUM0B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CSW040-UUM0B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CSW040-UUM0B-T?
AT24CSW040-UUM0B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CSW040-UUM0B-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 AT24CSW040-UUM0B-T?
For technical support, including AT24CSW040-UUM0B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CSW040-UUM0B-T requirements.
6.How does Aetrix verify that AT24CSW040-UUM0B-T is sourced from the original manufacturer or authorized distributors?
All AT24CSW040-UUM0B-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 AT24CSW040-UUM0B-T meets industry standards.
7.What is the process for return or replacement of AT24CSW040-UUM0B-T?
All AT24CSW040-UUM0B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CSW040-UUM0B-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 AT24CSW040-UUM0B-T part is unused and in its original packaging.
Return procedure for AT24CSW040-UUM0B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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