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Microchip Technology AT24CS04-SSHM-B
- Part No.:
- AT24CS04-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS04-SSHM-B.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
AT24CS04-SSHM-B from Microchip Technology is a 4-Kbit (512 × 8) I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, 1.7V–5.5V supply range, and industrial temperature rating (−40°C to +85°C). It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C operation and features hardware write protection via WP pin for full-array data security in embedded system configuration storage.
For engineers reviewing the AT24CS04-SSHM-B datasheet, AT24CS04-SSHM-B pinout, AT24CS04-SSHM-B application, or AT24CS04-SSHM-B equivalent, this device is selected for secure, low-voltage, high-reliability nonvolatile memory in space-constrained industrial controllers, IoT node identity management, and firmware parameter storage where serialization and write endurance are critical.
Technical Context
The AT24CS04-SSHM-B operates as an I²C slave with fixed 7-bit device address (1010xxx) determined by A1/A2 pins, supporting up to four devices on one bus. Its internal architecture includes separate 128-bit read-only serial number memory block-physically isolated from user EEPROM array-and integrated Schmitt-trigger inputs with noise filtering for robust two-wire bus operation in electrically noisy environments.
It implements page-write mode (16-byte pages), self-timed write cycles ≤5 ms, and automatic acknowledge polling. The WP pin enables hardware-level write inhibition when tied to VCC, while internally pulled-down A1/A2/WP pins ensure deterministic behavior when left unconnected-critical for simplified PCB layout in cost-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8), organized as 32 pages of 16 bytes - enables efficient partial-page writes without erasing full sectors. |
| Supply Voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters. |
| I²C Speed Modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus at ≥2.5V) - allows bandwidth scaling based on host controller capability and noise environment. |
| Write Endurance | 1,000,000 cycles - ensures long-term reliability in applications requiring frequent calibration or logging updates. |
| Data Retention | 100 years at 55°C - guarantees persistent storage integrity over product lifetime without refresh. |
| Standby Current | ≤6 μA at 5.5V - minimizes power draw in battery-backed or energy-harvesting systems during idle periods. |
| Serial Number | 128-bit factory-programmed, permanent, read-only - provides cryptographically usable device identity without consuming user memory space. |
Pinout & Package
AT24CS04-SSHM-B is supplied in 8-lead SOIC package (3.9mm × 4.9mm), RoHS-compliant and halide-free. Pin 1 is NC (no connect); pins A1 and A2 configure I²C device address; SDA and SCL implement open-drain bidirectional I²C interface; WP enables hardware write lock; VCC and GND provide power rails.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unused pin; must be left floating or tied to GND per layout best practice - no electrical function. |
| 2 (A1) | Device Address Input | Hard-wired to GND/VCC to set LSB of 7-bit I²C address; enables up to four AT24CS04 devices on same bus. |
| 3 (A2) | Device Address Input | Hard-wired to GND/VCC to set second LSB of I²C address; used with A1 for full 4-device addressing. |
| 4 (GND) | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into I²C lines. |
| 5 (SDA) | Serial Data I/O | Open-drain bidirectional line; requires external pull-up resistor (≤10 kΩ); shared across multiple I²C slaves. |
| 6 (SCL) | Serial Clock Input | Master-generated clock; rising edge latches input data, falling edge outputs data; also requires pull-up. |
| 7 (WP) | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables normal operation. |
| 8 (VCC) | Power Supply | 1.7V–5.5V supply input; must ramp monotonically at ≤0.1 V/µs; includes internal POR circuit. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit value permanently programmed and locked during wafer test - eliminates post-manufacturing serialization overhead and ensures global uniqueness across CS Series. |
| Hardware Write Protection | WP pin directly inhibits all write operations when driven high - prevents accidental or malicious firmware corruption without software intervention. |
| Noise-Resilient I²C Interface | Schmitt-trigger inputs and spike suppression filters on SDA/SCL - maintain reliable communication in industrial EMI environments without external RC filtering. |
| Ultra-Low Standby Power | 6 μA max at 5.5V - extends battery life in portable medical sensors and remote telemetry nodes where EEPROM remains powered continuously. |
| Page Write Architecture | 16-byte page buffer with partial-write support - reduces write time vs. byte-write and avoids unnecessary page erases in fragmented update scenarios. |
Applications
| Industrial Controller Configuration Storage | IoT Device Identity Management |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets, PID coefficients, and network credentials in programmable logic controllers (PLCs) deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent parameter retention across power cycles and firmware updates. Use Value: Enables field-replaceable modules to retain site-specific settings without reprogramming; 100-year data retention ensures compliance with industrial maintenance schedules. |
Use Scenario: Embedding unique device identifiers in smart meters and asset trackers for secure cloud onboarding and firmware attestation. IC Role / Device Role / Timing Role: Secure identity anchor delivering cryptographically verifiable serial number independent of main MCU resources. Use Value: Offloads identity generation from MCU flash; 128-bit uniqueness eliminates collision risk across billion-unit deployments without backend coordination. |
| Firmware Parameter Backup | Medical Sensor Calibration Storage |
|
Use Scenario: Backing up runtime-adjusted parameters (e.g., display brightness, alarm thresholds) in handheld diagnostic instruments between sessions. IC Role / Device Role / Timing Role: Low-power shadow memory preserving user preferences and operational history during sleep or battery removal. Use Value: 6 μA standby current extends single-CR2032 battery life beyond 10 years; 1.7V operation ensures data integrity down to end-of-battery voltage. |
Use Scenario: Storing factory-calibrated gain/offset values for analog front-end circuits in portable ultrasound transducers. IC Role / Device Role / Timing Role: Tamper-resistant calibration vault with hardware write lock preventing unauthorized modification of medical accuracy-critical data. Use Value: WP pin hardwired to VCC ensures calibration data survives software crashes or malware; 1M write cycles support recalibration during service intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C04D-SSHM-T | Same 4-Kbit capacity and SOIC-8 package, but lacks factory-programmed serial number and Fast Mode Plus (1 MHz) support. | Lower-cost option where device identity is managed externally; not suitable for zero-touch provisioning or cryptographic binding. | Select when serial number functionality is unnecessary and I²C speed ≤400 kHz suffices. |
| M24C04-RMN6TP | 4-Kbit I²C EEPROM in 8-lead TSSOP; supports 1 MHz only above 2.5V; no unique serial number; endurance rated at 400k cycles. | Compatible for basic parameter storage but lacks serialization and long-term reliability assurance for medical/industrial use. | Choose only for cost-sensitive consumer applications with less stringent retention or endurance requirements. |
Compared with AT24CS04-SSHM-B, AT24C04D-SSHM-T omits the 128-bit serial number and FM+ capability, while M24C04-RMN6TP trades endurance and serialization for lower unit cost-making AT24CS04-SSHM-B the sole choice when guaranteed device identity and 1M-cycle reliability are design requirements.
Availability
AT24CS04-SSHM-B is available at Aetrix Electronics and suitable for industrial control systems, IoT edge nodes, medical instrumentation, and automotive body electronics requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for AT24CS04-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CS04-SSHM-B belongs to Microchip's CS Series Serial EEPROM family, designed specifically for applications demanding guaranteed device uniqueness, low-voltage operation, and high reliability in harsh industrial and medical environments.
FAQ
What is the function of the NC pin on the AT24CS04-SSHM-B?
The NC (No Connect) pin on AT24CS04-SSHM-B is pin 1 in the 8-lead SOIC package and serves no electrical function. It must remain unconnected-neither tied to VCC nor GND-to avoid unintended parasitic coupling. This pin is reserved for future compatibility and has no impact on AT24CS04-SSHM-B operation or pinout mapping.
Does the AT24CS04-SSHM-B support 1 MHz I²C communication across its full voltage range?
No, AT24CS04-SSHM-B supports 1 MHz Fast Mode Plus (FM+) only when VCC is 2.5V or higher. At 1.7V–2.5V, maximum I²C speed is limited to 400 kHz. This voltage-dependent timing is defined in the AC Characteristics table of the official datasheet and must be observed to ensure reliable communication in low-voltage applications.
How is the 128-bit serial number accessed on the AT24CS04-SSHM-B?
The 128-bit serial number on AT24CS04-SSHM-B resides in a dedicated, read-only memory block starting at address 0x00FA and occupies 16 bytes (0xFA–0xFF). It is accessed using standard I²C random-read commands-no special protocol or unlock sequence is required. The value is factory-programmed and cannot be altered, erased, or overwritten under any condition.
Can the AT24CS04-SSHM-B operate reliably at 1.7V with full I²C functionality?
Yes, AT24CS04-SSHM-B is fully specified for operation at 1.7V, including I²C communication at 100 kHz and 400 kHz, read/write operations, and standby current ≤1.0 μA. All DC and AC parameters-including VOL, VIH, and tAA-are guaranteed across the 1.7V–5.5V range, enabling direct integration with 1.8V logic families without level translation.
What happens if the WP pin on the AT24CS04-SSHM-B is left floating?
If the WP pin on AT24CS04-SSHM-B is left floating, it is internally pulled down to GND, enabling normal write operations. However, Microchip explicitly recommends connecting WP to a defined logic state (VCC or GND) due to potential capacitive coupling in real-world PCB layouts, which could cause intermittent write-enable behavior and compromise data integrity.
AT24CS04-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:
- 4Kbit
- Memory Organization:
- 512 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
AT24CS04-SSHM-B FAQ
1.How can I place an order for AT24CS04-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS04-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 AT24CS04-SSHM-B reliable?
The price and inventory of AT24CS04-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 AT24CS04-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS04-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS04-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS04-SSHM-B?
AT24CS04-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS04-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 AT24CS04-SSHM-B?
For technical support, including AT24CS04-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS04-SSHM-B requirements.
6.How does Aetrix verify that AT24CS04-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS04-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 AT24CS04-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS04-SSHM-B?
All AT24CS04-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS04-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 AT24CS04-SSHM-B part is unused and in its original packaging.
Return procedure for AT24CS04-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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