Microchip Technology AT24CSW010-STUM-T

Overview

AT24CSW010-STUM-T from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM with integrated security register, software write protection, and ultra-low power operation (1.7V–3.6V). It provides 128 × 8-bit memory organization, factory-programmed 128-bit unique serial number, and 16 bytes of user-programmable security EEPROM. Used in secure device authentication, calibration data storage, and industrial sensor node configuration.

For engineers reviewing the AT24CSW010-STUM-T datasheet, AT24CSW010-STUM-T pinout, AT24CSW010-STUM-T application, or AT24CSW010-STUM-T equivalent, key selection criteria include its 4-ball WLCSP package, hardware client address, 1 MHz Fast Mode Plus support, and permanent software write-protection capability for critical configuration data.

Technical Context

The AT24CSW010-STUM-T implements a two-wire I²C interface compliant with Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) protocols across 1.7V–3.6V VCC. Its internal architecture includes separate main EEPROM (128 × 8) and security register (256-bit: 128-bit read-only serial number + 16-byte user EEPROM), both accessible via distinct I²C sub-addresses.

Hardware write protection is absent on the STUM-T variant (4-ball WLCSP), relying exclusively on five-level software write protection with optional permanent lock. Schmitt-trigger inputs and noise-filtered SCL/SDA ensure robust operation in electrically noisy industrial environments.

Key Specifications

Pinout & Package

AT24CSW010-STUM-T is supplied in a 4-ball Ultra-Thin Wafer-Level Chip Scale Package (WLCSP), measuring 1.0 mm × 1.0 mm × 0.42 mm, optimized for space-constrained wearables and medical sensors.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM with security register applications.

Compared with AT24CSW010-STUM-T, the SOT23 variant adds hardware write protection but increases footprint and height; the SPI alternative sacrifices security register functionality and I²C compatibility, requiring interface redesign and external identity management.

Availability

AT24CSW010-STUM-T is available at Aetrix Electronics and suitable for medical sensor calibration, industrial PLC configuration, and smart meter firmware ID storage requiring stable component supply across extended product lifecycles.

Supply support for AT24CSW010-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with emphasis on reliability and long-term product availability.

The AT24CSW01X series targets secure, low-power embedded systems requiring trusted device identity and tamper-resistant configuration storage - designed specifically for industrial, medical, and IoT endpoints where firmware integrity and calibration traceability are critical.

FAQ

What is the package type and dimensions of the AT24CSW010-STUM-T?

The AT24CSW010-STUM-T uses a 4-ball Ultra-Thin Wafer-Level Chip Scale Package (WLCSP) with 0.4 mm pitch. Its dimensions are 1.0 mm × 1.0 mm × 0.42 mm, making it suitable for ultra-compact designs such as hearing aids and implantable sensors. The ball layout is A1=VCC, A2=GND, B1=SCL, B2=SDA - no WP pin is present in this WLCSP variant.

Does the AT24CSW010-STUM-T support hardware write protection via the WP pin?

No, the AT24CSW010-STUM-T does not support hardware write protection because it is packaged in a 4-ball WLCSP that omits the WP terminal. Write protection is implemented exclusively through software commands enabling five configurable protection levels, including optional permanent lock. This differs from the SOT23 variant (e.g., AT24CSW010-SSHM-T), which includes a dedicated WP pin.

How is the 128-bit serial number in the AT24CSW010-STUM-T programmed and secured?

The 128-bit serial number in the AT24CSW010-STUM-T is factory-programmed during wafer probe and permanently locked before packaging - it cannot be altered, erased, or overwritten by any software or hardware means. It resides in a read-only section of the security register and consumes no space from the main 1-Kbit EEPROM array. Uniqueness is guaranteed across all CS/CSW-series devices, regardless of memory size or interface protocol.

What I²C speed modes does the AT24CSW010-STUM-T support, and what are the voltage requirements?

The AT24CSW010-STUM-T supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1 MHz) across its full operating voltage range of 1.7V to 3.6V. All speed modes are functional at minimum VCC (1.7V), eliminating need for voltage scaling when increasing bus speed. AC timing parameters - including tLOW, tHIGH, and tSU.DAT - are fully specified for each mode in the official datasheet DS20006396B.

Can the 16-byte user-programmable section of the security register in the AT24CSW010-STUM-T be permanently write-protected?

Yes, the 16-byte user-programmable section of the security register in the AT24CSW010-STUM-T can be permanently write-protected using the same software write protection mechanism applied to the main EEPROM array. Once enabled, this protection cannot be reversed, ensuring irreversible safeguarding of cryptographic keys or other sensitive data stored in that region. The protection level is configurable independently from the main array.