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Microchip Technology AT24CS01-SSHM-B
- Part No.:
- AT24CS01-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS01-SSHM-B.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:393
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Product details
Overview
AT24CS01-SSHM-B from Microchip Technology is a 1-Kbit (128 × 8) I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, operating from 1.7V to 5.5V, supporting 100 kHz/400 kHz/1 MHz I²C modes, and housed in an 8-lead SOIC package. It delivers ultra-low standby current (6 μA max), 1M write endurance, and 100-year data retention for secure device identification and configuration storage in industrial control modules.
For engineers reviewing the AT24CS01-SSHM-B datasheet, AT24CS01-SSHM-B pinout, AT24CS01-SSHM-B application, or AT24CS01-SSHM-B equivalent, key selection criteria include its guaranteed unique serial number, hardware write-protection via WP pin, page-write capability (8-byte pages), industrial temperature range (–40°C to +85°C), and compatibility with mixed-voltage I²C buses down to 1.7V.
Technical Context
The AT24CS01-SSHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0/A1/A2/WP pins. Its memory array is organized as 16 pages of 8 bytes each, with separate dedicated address space (device type identifier '1011b') for accessing the permanent 128-bit serial number.
It features a Power-on Reset (POR) circuit with 100 µs tPUP delay, supports random/sequential reads and byte/page writes, and enforces hardware write protection when WP = VCC. The device uses internal high-voltage generation for EEPROM programming and includes acknowledge polling for write-cycle completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1,024 bits (128 × 8), nonvolatile EEPROM storage for calibration data, MAC addresses, or firmware metadata |
| I²C speed modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz FM+ (2.5–5.5V) - enables flexible timing margining in mixed-voltage systems |
| Supply voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifters |
| Standby current | ≤6 µA at 5.5V - minimizes quiescent power in battery-backed or energy-harvesting applications |
| Write endurance | 1,000,000 cycles - ensures reliable field updates over product lifetime in programmable logic controllers or sensor nodes |
| Data retention | 100 years at 55°C - guarantees long-term integrity of serialized identifiers and configuration parameters |
| Serial number | 128-bit factory-programmed, read-only, globally unique across all CS Series - eliminates need for external serialization during manufacturing |
Pinout & Package
AT24CS01-SSHM-B is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with standard 150-mil body width and gull-wing leads. Pin 1 is marked with a dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware device address input | Configures LSB of 7-bit I²C slave address (1010xxx); pulled down internally if floating - enables up to 8 devices on one bus |
| A1 | Hardware device address input | Configures middle bit of 7-bit I²C slave address; internal pull-down avoids bus contention in unconnected states |
| A2 | Hardware device address input | Configures MSB of 7-bit I²C slave address; allows deterministic addressing without external resistors in fixed-topology designs |
| GND | Power ground reference | Common return path for VCC and signal currents; must be low-impedance to ensure noise immunity on SDA/SCL lines |
| SDA | Open-drain bidirectional serial data | Requires external pull-up resistor (≤10 kΩ); supports wire-OR with other I²C devices; latched on SCL rising edge |
| SCL | Serial clock input | Master-generated clock; falling-edge data output timing; filtered and Schmitt-triggered for robustness against EMI |
| WP | Hardware write-protect enable | Hardwired to VCC to lock entire memory array; pulled down internally if floating - prevents accidental overwrites during power transients |
| VCC | Positive supply voltage | 1.7–5.5V operation; POR circuit ensures no spurious writes until stable; slew rate ≤0.1 V/µs recommended |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently written during wafer test; occupies dedicated address space ('1011' prefix); zero overhead on user memory |
| Hardware write protection (WP pin) | Full-array lock when tied to VCC; eliminates need for software-based write-disable sequences in safety-critical firmware |
| 8-byte page write mode | Enables partial-page writes without erasing adjacent bytes; reduces write latency vs. full-page erase architectures |
| Ultra-low active current (3 mA max) | Minimizes dynamic power during configuration reads/writes in portable medical devices or wireless sensors |
| Noise-suppressed I/O | Schmitt triggers + input filtering on SDA/SCL - maintains I²C compliance in electrically noisy industrial enclosures |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets, PID coefficients, and device-specific thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent parameter storage between power cycles and firmware updates. Use Value: Eliminates manual re-calibration after power loss; 100-year data retention ensures accuracy over equipment lifetime without maintenance. |
Use Scenario: Securing unique device identifiers and calibration constants for FDA-compliant infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Tamper-resistant identity anchor and calibration vault, accessed only during authorized service procedures. Use Value: Factory-programmed 128-bit serial number satisfies UDI (Unique Device Identification) requirements without host MCU involvement. |
| Smart Energy Meter Firmware Metadata | Automotive Body Control Module Settings |
|
Use Scenario: Recording firmware version, production date, and cryptographic keys in ANSI C12.22-compliant smart meters operating in wide-temperature outdoor environments. IC Role / Device Role / Timing Role: Secure metadata repository supporting remote firmware validation and anti-counterfeiting checks. Use Value: Industrial temperature rating (–40°C to +85°C) and 1M write cycles enable reliable field updates over 20+ year meter deployments. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive body control units (BCUs) with CAN/LIN interfaces. IC Role / Device Role / Timing Role: Low-power configuration store synchronized with vehicle ignition state transitions. Use Value: 1.7V operation allows direct connection to 1.8V domain MCUs; 6 µA standby current extends battery life during vehicle sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C01D-SSHM-T | No factory-programmed serial number; identical 1-Kbit organization, SOIC-8, and I²C timing; lacks 128-bit UID block | Used where device identity is managed externally (e.g., host MCU flash or secure element); lower unit cost | Select when serialization is handled by system-level firmware or external security ICs - not suitable for UDI or zero-touch provisioning. |
| M95010-WMN6TP | 1-Kbit SPI interface (not I²C); same voltage range and endurance; no built-in serial number; operates up to 20 MHz SPI clock | Preferred in designs already using SPI peripherals to avoid I²C bus resource contention or protocol stack overhead | Choose for SPI-native platforms requiring faster sequential reads; requires redesign of communication driver and PCB routing. |
Compared with AT24CS01-SSHM-B, AT24C01D-SSHM-T omits the critical 128-bit UID feature but offers identical memory functionality at lower cost, while M95010-WMN6TP trades I²C compatibility for higher-speed SPI access - neither provides drop-in replacement capability due to interface or serialization differences.
Availability
AT24CS01-SSHM-B is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data retention, and smart energy meter firmware metadata management requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.
Supply support for AT24CS01-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and embedded system integration.
The AT24CS01-SSHM-B belongs to Microchip's CS Series Serial EEPROM family, designed specifically to simplify device serialization and secure configuration storage in industrial, medical, and automotive applications without adding host MCU complexity.
FAQ
What is the function of the WP pin on the AT24CS01-SSHM-B?
The WP (Write-Protect) pin on the AT24CS01-SSHM-B provides hardware-level memory protection: when tied to VCC, it disables all write operations to the entire EEPROM array, preventing accidental or malicious overwrites. If left unconnected, the pin is internally pulled down to GND, enabling normal write functionality. This behavior is confirmed in the official Microchip DS20006330A datasheet Section 2.5 and Table 2-2.
Does the AT24CS01-SSHM-B support 1 MHz I²C communication?
Yes, the AT24CS01-SSHM-B supports 1 MHz Fast Mode Plus (FM+) I²C operation - but only within the 2.5V to 5.5V VCC range, as specified in the Electrical Characteristics table (Section 4.4, Table 4-3). At 1.7V–2.5V, maximum speed is limited to 400 kHz. This dual-speed capability allows optimized timing margins in mixed-voltage systems without sacrificing bandwidth.
How is the 128-bit serial number accessed on the AT24CS01-SSHM-B?
The 128-bit serial number on the AT24CS01-SSHM-B resides in a dedicated memory region accessible via I²C using device address prefix '1011b' (0xBx), distinct from the main EEPROM address space ('1010b' or 0xAx). It is read-only, factory-programmed, and globally unique across all CS Series devices. Full access protocol is defined in Section 8.4 (Serial Number Read) of the DS20006330A datasheet.
What is the maximum write cycle time for the AT24CS01-SSHM-B?
The AT24CS01-SSHM-B has a maximum self-timed write cycle time of 5 ms, as documented in Section 7.4 (Write Cycle Timing) and Table 4-3 of the DS20006330A datasheet. This applies to both byte and page writes. Acknowledge polling is supported to detect completion without fixed delays, improving system efficiency in time-sensitive applications.
Is the AT24CS01-SSHM-B compatible with 1.8V I²C buses?
Yes, the AT24CS01-SSHM-B fully supports 1.8V I²C operation: its VCC range includes 1.7V–5.5V, and it guarantees 100 kHz and 400 kHz I²C timing compliance across that full range (Section 4.2 and Table 4-3). The device's Schmitt-triggered inputs and noise filtering ensure robust communication even with marginal signal integrity typical in 1.8V domains.
AT24CS01-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:
- 1Kbit
- Memory Organization:
- 128 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
AT24CS01-SSHM-B FAQ
1.How can I place an order for AT24CS01-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS01-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 AT24CS01-SSHM-B reliable?
The price and inventory of AT24CS01-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 AT24CS01-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS01-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS01-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS01-SSHM-B?
AT24CS01-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS01-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 AT24CS01-SSHM-B?
For technical support, including AT24CS01-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS01-SSHM-B requirements.
6.How does Aetrix verify that AT24CS01-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS01-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 AT24CS01-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS01-SSHM-B?
All AT24CS01-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS01-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 AT24CS01-SSHM-B part is unused and in its original packaging.
Return procedure for AT24CS01-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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