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Microchip Technology AT24CS02-SSHM-B
- Part No.:
- AT24CS02-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS02-SSHM-B.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
AT24CS02-SSHM-B from Microchip Technology is a 2-Kbit (256 × 8) I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, operating from 1.7V to 5.5V, supporting 1 MHz Fast Mode Plus at 2.5–5.5V, and rated for -40°C to +85°C industrial temperature range. It delivers ultra-low standby current (6 μA max), 1,000,000 write cycles endurance, and 100-year data retention - deployed in secure device authentication and calibration storage for industrial sensors.
For engineers reviewing the AT24CS02-SSHM-B datasheet, AT24CS02-SSHM-B pinout, AT24CS02-SSHM-B application, or AT24CS02-SSHM-B equivalent, key selection considerations include its hardware write-protect pin, 8-byte page write capability with ≤5 ms self-timed write cycle, Schmitt-triggered noise-immune I²C interface, and guaranteed uniqueness of the 128-bit serial number across all CS Series devices.
Technical Context
The AT24CS02-SSHM-B operates as an I²C slave device with fixed 7-bit address base '1010' for main memory and '1011' for serial number access. Its internal architecture integrates a high-voltage generation circuit for EEPROM programming, hardware address comparators for multi-device bus support, and power-on reset logic ensuring command rejection until VCC stabilizes ≥1.5V and tPUP ≥100 µs elapses.
It implements bidirectional open-drain I²C communication with SDA latched on SCL rising edge and driven on falling edge, incorporating integrated spike suppression filters and Schmitt triggers on both SCL and SDA. The WP pin provides full-array hardware write protection when tied to VCC, while A0–A2 pins enable up to eight devices per bus via hard-wired addressing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8), organized in 32 pages of 8 bytes each - enables efficient partial-page writes without erasing full pages. |
| Supply voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting. |
| I²C speed modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus at 2.5–5.5V) - allows bandwidth scaling based on host controller capability and noise environment. |
| Write endurance | 1,000,000 cycles - ensures reliable logging or configuration updates over 10+ years in field-deployed equipment. |
| Data retention | 100 years at 55°C - guarantees long-term calibration or serial ID persistence in unpowered storage or harsh thermal environments. |
| Standby current | 6 μA max at 5.5V - minimizes battery drain in always-on IoT nodes or portable instrumentation. |
| Serial number | 128-bit factory-programmed, read-only, globally unique across entire CS Series - eliminates need for external serialization during manufacturing. |
Pinout & Package
AT24CS02-SSHM-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 150-mil body width and 1.27 mm pitch. This RoHS-compliant, green package supports automated pick-and-place and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware device address input | Hard-wired to GND or VCC to set LSB of 7-bit I²C slave address; enables up to eight devices on one bus. |
| A1 | Hardware device address input | Hard-wired to GND or VCC to set middle bit of 7-bit I²C slave address; used with A0 and A2 for full 3-bit addressing. |
| A2 | Hardware device address input | Hard-wired to GND or VCC to set MSB of 7-bit I²C slave address; determines unique device address within bus group. |
| GND | Power ground reference | System ground connection; required for stable operation and noise immunity; exposed pad (if present) may be connected to GND. |
| SDA | Serial data bidirectional I/O | Open-drain line requiring external pull-up resistor (≤10 kΩ); shared across multiple I²C slaves; transmits/receives commands and data. |
| SCL | Serial clock input | Input-only clock line; controls timing of data transfer; must be pulled high externally; rising edge latches input, falling edge outputs data. |
| WP | Hardware write-protect control | When tied to VCC, disables all write operations to main memory array; floating defaults to GND (write enabled) but recommended to tie to known state. |
| VCC | Device power supply | 1.7–5.5V supply input; includes internal POR circuit that blocks commands until VCC ≥1.5V and tPUP ≥100 µs has elapsed. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently locked, globally unique identifier stored in dedicated read-only memory block - removes serialization step from production line. |
| Hardware write-protect (WP) pin | Full-array protection activated by tying WP to VCC - prevents accidental or malicious firmware/config corruption without software intervention. |
| 8-byte page write mode | Allows partial writes within 8-byte boundaries; reduces write time vs. byte-by-byte and avoids unnecessary page erases. |
| Schmitt-triggered, filtered I²C inputs | Suppresses bus noise and EMI-induced glitches on SCL/SDA - improves reliability in electrically noisy industrial or automotive environments. |
| Ultra-low active and standby current | 3 mA max active (read/write), 6 μA max standby at 5.5V - extends battery life in energy-constrained edge devices. |
Applications
| Secure Device Authentication | Calibration Data Storage |
|---|---|
Use Scenario: Embedded systems requiring tamper-resistant identification for regulatory compliance or anti-counterfeiting (e.g., medical sensors, industrial gauges). IC Role / Device Role / Timing Role: Nonvolatile storage of cryptographic keys and immutable device identity; accessed via I²C during boot or authentication handshake. Use Value: Leverages factory-programmed 128-bit serial number - eliminates need for post-manufacturing key injection and reduces BOM cost and test time. | Use Scenario: Field-deployed instrumentation where sensor offset/gain coefficients must survive power loss and retain accuracy over decades. IC Role / Device Role / Timing Role: Persistent storage of calibrated parameters; written once during factory trim, read at system startup. Use Value: 100-year data retention at 55°C ensures calibration integrity across product lifetime without periodic recalibration. |
| Firmware Configuration Backup | Industrial Control System Logging |
Use Scenario: Programmable logic controllers (PLCs) storing user-defined I/O mapping, alarm thresholds, or network settings. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via I²C during initialization or runtime update; protected by WP pin during normal operation. Use Value: Hardware write-protection prevents unintended overwrite during transient faults or firmware bugs - maintains system stability. | Use Scenario: Predictive maintenance gateways recording timestamped operational events (e.g., motor start/stop, fault codes) in remote locations. IC Role / Device Role / Timing Role: Low-power event logger using page-write mode to batch small records; powered from backup capacitor or energy harvester. Use Value: 1,000,000 write cycles and 6 μA standby current enable >10 years of daily logging without battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02D-SSHM-T | No factory-programmed serial number; standard 2-Kbit I²C EEPROM with same SOIC-8 package and 1.7–5.5V operation. | Lacks unique ID functionality; suitable only where serialization is handled externally or not required. | Select when cost sensitivity outweighs need for embedded device identity and no production-line serialization infrastructure exists. |
| M95M02-DFMN6TP | 2-Mbit SPI interface EEPROM (not I²C); 2.5–5.5V supply; 5-ms write cycle; no built-in serial number. | Requires SPI host interface and different driver stack; incompatible pinout and protocol - not drop-in replaceable. | Choose only if migrating to SPI-based architecture and higher density (2 Mbit) is needed; redesign required. |
Compared with AT24C02D-SSHM-T, the AT24CS02-SSHM-B adds irreplaceable device-level uniqueness without increasing footprint or voltage requirements; versus M95M02-DFMN6TP, it preserves I²C compatibility and eliminates protocol migration effort, though at lower density.
Availability
AT24CS02-SSHM-B is available at Aetrix Electronics and suitable for secure authentication, calibration storage, firmware configuration backup, and industrial logging applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for AT24CS02-SSHM-B 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 leading provider of microcontrollers, analog components, and memory solutions, with global design, manufacturing, and support infrastructure focused on embedded control and connectivity.
The AT24CS02-SSHM-B belongs to Microchip's CS Series Serial EEPROM family, engineered specifically for applications demanding guaranteed device uniqueness, low-voltage operation, and industrial-grade reliability - targeting secure identification and long-term data integrity in constrained environments.
FAQ
What is the function of the WP pin on the AT24CS02-SSHM-B?
The WP (Write-Protect) pin on the AT24CS02-SSHM-B enables hardware-level protection of the entire memory array. When tied to VCC, it inhibits all write operations including byte, page, and serial number reads - preventing accidental or malicious modification. If left floating, it defaults to GND (write enabled), but Microchip recommends connecting it to a defined logic level to avoid noise-induced behavior. This feature is integral to the AT24CS02-SSHM-B's role in secure configuration storage.
Does the AT24CS02-SSHM-B support 1 MHz I²C communication?
Yes, the AT24CS02-SSHM-B supports 1 MHz Fast Mode Plus (FM+) I²C operation - but only when VCC is between 2.5V and 5.5V. At lower voltages (1.7–2.5V), it operates up to 400 kHz Fast Mode. This dual-speed capability allows the AT24CS02-SSHM-B to maximize throughput in 3.3V/5V systems while maintaining compatibility with 1.8V hosts at reduced speed - critical for mixed-voltage designs.
How is the 128-bit serial number accessed on the AT24CS02-SSHM-B?
The 128-bit serial number on the AT24CS02-SSHM-B is accessed via a dedicated I²C address space using device type identifier '1011' (0xBx) instead of the standard '1010' (0xAx) used for main memory. It resides in a separate, read-only memory block that does not consume user memory space. The AT24CS02-SSHM-B guarantees uniqueness of this value across the entire CS Series, making it ideal for device authentication without external database management.
What is the maximum write cycle time for the AT24CS02-SSHM-B?
The AT24CS02-SSHM-B has a maximum self-timed write cycle time of 5 ms for both byte and page writes, as specified in the official Microchip datasheet DS20006330A. This value is independent of VCC and I²C clock speed, and applies across the full industrial temperature range (-40°C to +85°C). During this period, the device does not acknowledge I²C commands - requiring host firmware to implement acknowledge polling or fixed-delay recovery before subsequent operations on the AT24CS02-SSHM-B.
Is the AT24CS02-SSHM-B RoHS compliant and lead-free?
Yes, the AT24CS02-SSHM-B is RoHS compliant and manufactured in green packaging - explicitly stated in the datasheet as "Green Package Options (Lead-free/Halide-free/RoHS compliant)". The 'SSHM-B' suffix denotes an 8-lead SOIC package with matte tin finish, fully compliant with JEDEC J-STD-609A Class 1 moisture sensitivity and EU RoHS Directive 2011/65/EU. This ensures suitability for modern automated assembly and environmental compliance requirements in global electronics production involving the AT24CS02-SSHM-B.
AT24CS02-SSHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24CS02-SSHM-B FAQ
1.How can I place an order for AT24CS02-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS02-SSHM-B 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 AT24CS02-SSHM-B reliable?
The price and inventory of AT24CS02-SSHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS02-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS02-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS02-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS02-SSHM-B?
AT24CS02-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS02-SSHM-B 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 AT24CS02-SSHM-B?
For technical support, including AT24CS02-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS02-SSHM-B requirements.
6.How does Aetrix verify that AT24CS02-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS02-SSHM-B 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 AT24CS02-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS02-SSHM-B?
All AT24CS02-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS02-SSHM-B, 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 AT24CS02-SSHM-B part is unused and in its original packaging.
Return procedure for AT24CS02-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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