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Microchip Technology AT24CS08-STUM-T
- Part No.:
- AT24CS08-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24CS08-STUM-T.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
AT24CS08-STUM-T from Microchip Technology is an 8-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 1,024 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It supports 1 MHz Fast Mode Plus (2.5–5.5V), includes hardware write-protection via WP pin, and delivers ultra-low standby current (6 μA max) for battery-powered asset tracking and secure device identification.
For engineers reviewing the AT24CS08-STUM-T datasheet, AT24CS08-STUM-T pinout, AT24CS08-STUM-T application, or AT24CS08-STUM-T equivalent, key selection criteria include I²C bus compatibility up to 1 MHz, guaranteed uniqueness of the 128-bit serial number across all CS-series devices, page-write capability (16-byte pages), and support for cascaded two-device addressing on a shared bus.
Technical Context
The AT24CS08-STUM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds depending on VCC level. Its internal architecture includes a dedicated 128-bit read-only serial number block physically isolated from user memory, ensuring no address or endurance impact on the 8-Kbit EEPROM array.
Addressing uses hard-wired A2 (A1 is NC on AT24CS08) to configure one of two possible device addresses on the same I²C bus; WP pin enables full-array hardware write protection; and power-on reset (POR) circuitry enforces tPUP ≥ 100 µs delay before command acceptance after stable VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1,024 × 8 bits), organized in 64 pages of 16 bytes each |
| Interface | I²C-compatible two-wire serial interface with ACK/NACK protocol and 9-cycle byte transfer |
| Operating voltage | 1.7V to 5.5V - supports single-supply operation across wide industrial and portable systems |
| Max clock frequency | 1 MHz (Fast Mode Plus) at VCC ≥ 2.5V; 400 kHz at VCC ≥ 1.7V - enables high-throughput configuration storage |
| Write endurance | 1,000,000 cycles - ensures long-term reliability in firmware update logging or calibration storage |
| Data retention | 100 years at 55°C - guarantees persistent identity and configuration data over product lifetime |
| Serial number | 128-bit factory-programmed, permanent, read-only value - globally unique across entire Microchip CS Series |
| Standby current | 6 μA max at VCC = 5.5V - minimizes quiescent power in always-on IoT edge nodes |
Pinout & Package
AT24CS08-STUM-T is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with exposed pad (optional GND connection). Pin functions are validated per Microchip DS20006350A-page 4–5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No-connect terminal | Not bonded; must be left unconnected - no electrical function or routing required |
| A2 | Device address input | Hard-wired to VCC or GND to select one of two I²C addresses; internally pulled down if floating |
| GND | Ground reference | System return path for VCC and signal logic; connects to exposed pad (optional) |
| VCC | Power supply input | 1.7–5.5V supply; requires monotonically ramped power-up with ≤0.1 V/µs slew rate |
| WP | Hardware write-protect control | Logic high (VCC) disables all writes; internally pulled down if floating - prevents accidental overwrites |
| SCL | Serial clock input | Master-generated clock; rising edge latches input data, falling edge outputs data; filtered for noise immunity |
| SDA | Bidirectional serial data | Open-drain I/O requiring external pull-up; supports wire-OR with other I²C devices on same bus |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique identifier stored outside user memory - eliminates production-line serialization overhead |
| 16-byte page write mode | Enables partial writes within a page without erasing adjacent bytes - improves write efficiency in parameter updates |
| Three-speed I²C compatibility | Supports 100 kHz / 400 kHz / 1 MHz modes with automatic voltage-dependent speed selection - simplifies design reuse across voltage domains |
| Integrated noise suppression | Schmitt triggers and input filters on SDA/SCL - reduce false triggering in electrically noisy industrial environments |
| Hardware write protection | WP pin disables all memory writes when driven high - provides fail-safe data integrity independent of firmware state |
Applications
| Asset Tracking Tag | Medical Device Calibration |
|---|---|
Use Scenario: Embedded in disposable or reusable medical sensors to store unique device ID, manufacturing lot, and calibration coefficients. IC Role / Device Role / Timing Role: Nonvolatile identity and configuration storage with tamper-resistant write protection. Use Value: Enables regulatory-compliant traceability and field recalibration without risk of accidental overwrite due to WP pin and 100-year data retention. | Use Scenario: Used in portable diagnostic equipment (e.g., pulse oximeters, glucose meters) to retain sensor-specific calibration constants across power cycles. IC Role / Device Role / Timing Role: Low-power, I²C-accessible configuration memory with guaranteed uniqueness for device-level firmware binding. Use Value: Supports FDA-required device identification and calibration audit trails using the factory-programmed 128-bit serial number. |
| Industrial PLC Module | Smart Energy Meter |
Use Scenario: Mounted on modular I/O cards in programmable logic controllers to store module type, revision, and channel mapping. IC Role / Device Role / Timing Role: Cascadable I²C EEPROM supporting up to two devices per bus for compact board space utilization. Use Value: Allows hot-swap detection and automatic firmware adaptation via unique serial number read during initialization. | Use Scenario: Integrated into utility-grade electricity meters to store meter ID, tariff tables, and firmware version history. IC Role / Device Role / Timing Role: Secure, low-voltage (1.7V) nonvolatile memory with ESD >4 kV - withstands harsh metering environments. Use Value: Ensures long-term billing accuracy and regulatory compliance through 1,000,000 write-cycle endurance and 100-year data retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CS08-SSHM-T | Same 8-Kbit capacity and serial number feature, but in 8-lead SOIC package (5.0 mm × 4.0 mm) | SOIC offers easier manual soldering and test probe access vs. UDFN's space-constrained footprint | Select AT24CS08-SSHM-T for prototyping or low-volume assembly where board real estate is not constrained. |
| M95M01-RMN6TP | 1-Mbit SPI EEPROM (not I²C), no factory serial number, operates 1.8–5.5V, 20 MHz SPI clock | Lacks built-in unique ID and I²C interface - requires SPI host and external serialization logic | Choose M95M01-RMN6TP only if SPI interface is already standardized in the system and serial number is managed externally. |
Compared with AT24CS08-STUM-T, the AT24CS08-SSHM-T offers identical functionality in a larger, more serviceable package, while the M95M01-RMN6TP trades I²C simplicity and embedded uniqueness for higher density and SPI speed - neither is pin-compatible or drop-in replaceable.
Availability
AT24CS08-STUM-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and smart metering applications requiring stable component supply, guaranteed long-term availability, and RoHS-compliant green packaging.
Supply support for AT24CS08-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and embedded system integration.
The AT24CS08-STUM-T belongs to Microchip's CS-series Serial EEPROM family, designed specifically to deliver factory-assured device identity alongside robust nonvolatile storage for secure, traceable, and maintenance-free embedded systems.
FAQ
What is the package type and dimensions of the AT24CS08-STUM-T?
The AT24CS08-STUM-T is packaged in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package measuring 2.0 mm × 1.6 mm with 0.5 mm pitch. It features an exposed thermal pad that may be connected to GND or left floating. This compact footprint is optimized for space-constrained PCB layouts in portable and IoT devices, and differs from SOIC or TSSOP variants of the same AT24CS08 device.
Does the AT24CS08-STUM-T support I²C Fast Mode Plus, and what voltage is required?
Yes, the AT24CS08-STUM-T supports I²C Fast Mode Plus at up to 1 MHz, but only when VCC is between 2.5V and 5.5V. At lower voltages (1.7V to 2.5V), it operates in Fast Mode (400 kHz) or Standard Mode (100 kHz). This voltage-dependent speed scaling is built into the device's interface logic and requires no external configuration - the host controller must adhere to the appropriate AC timing specifications per VCC level as defined in DS20006350A.
How is the 128-bit serial number accessed, and is it writable?
The 128-bit serial number in the AT24CS08-STUM-T is accessed via a dedicated I²C read sequence starting at address 0x08, and it is permanently programmed and locked during Microchip's production process. It resides in a separate, read-only memory region outside the main 8-Kbit user array and cannot be altered, erased, or overwritten under any condition - even with WP pin asserted or during power cycling. This ensures guaranteed uniqueness across all CS-series devices.
Can multiple AT24CS08-STUM-T devices share the same I²C bus, and how many?
Yes, up to two AT24CS08-STUM-T devices can share the same I²C bus. This is achieved using the A2 pin: hard-wiring A2 to GND or VCC selects one of two possible 7-bit device addresses (0x50 or 0x51). The A1 pin is not connected (NC) on the AT24CS08, unlike the AT24CS04 which supports four addresses. No external address jumpers or resistors beyond A2 biasing are required for dual-device configuration.
What is the write-protection behavior of the AT24CS08-STUM-T when the WP pin is left unconnected?
When the WP pin of the AT24CS08-STUM-T is left unconnected (floating), it is internally pulled down to GND, enabling normal write operations. However, Microchip explicitly warns that capacitive coupling in real-world PCB layouts may cause unintended WP activation, so they recommend connecting WP to a defined logic level (GND for write-enable, VCC for full-array protection) using ≤10 kΩ resistors. Leaving WP floating is not advised for production designs despite the internal pull-down.
AT24CS08-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:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AT24CS08-STUM-T FAQ
1.How can I place an order for AT24CS08-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS08-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 AT24CS08-STUM-T reliable?
The price and inventory of AT24CS08-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 AT24CS08-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24CS08-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS08-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS08-STUM-T?
AT24CS08-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS08-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 AT24CS08-STUM-T?
For technical support, including AT24CS08-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS08-STUM-T requirements.
6.How does Aetrix verify that AT24CS08-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS08-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 AT24CS08-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24CS08-STUM-T?
All AT24CS08-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS08-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 AT24CS08-STUM-T part is unused and in its original packaging.
Return procedure for AT24CS08-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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