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Microchip Technology AT24CS16-SSHM-B
- Part No.:
- AT24CS16-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS16-SSHM-B.pdf
- Description:
- IC EEPROM 16KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,548
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Product details
Overview
AT24CS16-SSHM-B from Microchip Technology is a 16-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 2,048 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It delivers ultra-low standby current (6 µA max), supports 1 MHz Fast Mode Plus, and includes hardware write protection via dedicated WP pin - used in secure device identification and configuration storage in embedded controllers and IoT edge nodes.
For engineers reviewing the AT24CS16-SSHM-B datasheet, AT24CS16-SSHM-B pinout, AT24CS16-SSHM-B application, or AT24CS16-SSHM-B equivalent, key selection considerations include its guaranteed-unique serial number across the CS Series, 1,000,000 write endurance, 100-year data retention, 16-byte page write capability, and compatibility with standard I²C bus timing at 100/400/1000 kHz.
Technical Context
The AT24CS16-SSHM-B 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) operation depending on VCC level. Its internal architecture integrates a dedicated 128-bit read-only serial number block - physically isolated from user memory - with no address overlap or consumption of the 2,048-word EEPROM array.
Write protection is enforced via the WP pin: tied to VCC disables all writes to the full array, while grounding enables normal operation; floating WP is internally pulled down but not recommended due to capacitive coupling risks. The device features automatic self-timed write cycles (≤5 ms), acknowledge polling support, and Power-on Reset (POR) with 100 µs tPUP delay before command acceptance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2,048 × 8), sufficient for firmware config, calibration data, and device identity storage |
| Interface | I²C two-wire (SCL/SDA), fully compliant with SMBus 2.0 electrical specs and timing |
| Serial number | 128-bit factory-programmed, permanent, globally unique across entire CS Series EEPROM family |
| Supply voltage | 1.7V–5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| Write endurance | 1,000,000 cycles - supports frequent logging or parameter updates in industrial control systems |
| Data retention | 100 years at 55°C - ensures long-term reliability in unattended deployments like smart meters |
| Standby current | 6 µA max at 5.5V - critical for battery-powered IoT sensors requiring multi-year operation |
| Write cycle time | ≤5 ms max - enables deterministic timing for real-time configuration updates |
Pinout & Package
AT24CS16-SSHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm body, 1.27 mm pitch). Pin functions are validated per Microchip DS20006342A-page 5 Table 2-1 and confirmed for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice |
| 2 (NC) | No Connect | Internally unconnected; no electrical function - avoid routing signals to this pad |
| 3 (NC) | No Connect | Internally unconnected; does not affect operation regardless of state |
| 4 (GND) | Ground reference | System return path for VCC and I/O; requires low-impedance connection to PCB ground plane |
| 5 (SDA) | Serial Data bidirectional I/O | Open-drain line requiring external pull-up (≤10 kΩ); shared across multiple I²C slaves |
| 6 (SCL) | Serial Clock input | Master-generated clock; rising edge latches input, falling edge outputs data; pull-up required |
| 7 (WP) | Hardware write-protect control | Active-high protection: VCC = full-array lock, GND = enable writes, floating = internal pull-down |
| 8 (VCC) | Power supply input | Accepts 1.7–5.5V; decoupling capacitor (0.1 µF) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Dedicated 128-bit serial number | Factory-programmed, immutable, and globally unique across all Microchip CS Series EEPROMs - eliminates need for external serialization in production |
| Multi-speed I²C support | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), and 1 MHz FM+ (2.5–5.5V) - enables optimal bus throughput across voltage domains |
| Schmitt-triggered, filtered inputs | Robust noise immunity on SDA/SCL - reduces false start/stop detection in electrically noisy industrial environments |
| 16-byte page write with partial writes | Allows efficient burst programming of up to 16 bytes per cycle without crossing page boundaries - improves firmware update speed |
| ESD protection >4 kV | HBM-rated protection meets IEC 61000-4-2 Level 2 - enhances handling safety and board-level reliability |
| Green packaging | Lead-free, halide-free, RoHS-compliant SOIC - satisfies global environmental compliance requirements for industrial and consumer products |
Applications
| Secure Device Authentication | Firmware Configuration Storage |
|---|---|
Use Scenario: Embedded system verifies authenticity of peripheral modules during boot using cryptographically signed challenge-response with device-unique serial number. IC Role / Device Role / Timing Role: AT24CS16-SSHM-B provides tamper-resistant, factory-assigned identity source for cryptographic binding - accessed once per power cycle via I²C. Use Value: Eliminates need for external secure element or software-based ID generation; 128-bit uniqueness prevents cloning across product families. | Use Scenario: Industrial PLC stores calibrated sensor offsets, communication parameters, and user-defined thresholds persistently across power cycles. IC Role / Device Role / Timing Role: AT24CS16-SSHM-B serves as nonvolatile configuration register bank - written infrequently, read at startup and runtime. Use Value: Enables field-updatable calibration without firmware reflash; 1,000,000 write cycles support decades of maintenance operations. |
| Smart Energy Metering | IoT Edge Node Identity |
Use Scenario: Utility meter logs energy consumption data and stores tamper-detection flags, requiring guaranteed data integrity over 15+ year service life. IC Role / Device Role / Timing Role: AT24CS16-SSHM-B acts as long-term event logger and security flag store - writes triggered by metering interrupts, reads during diagnostics. Use Value: 100-year data retention at 55°C and 6 µA standby current ensure reliable operation in sealed, battery-backed enclosures. | Use Scenario: Battery-powered environmental sensor node reports temperature/humidity to cloud platform, requiring unique device ID for provisioning and OTA updates. IC Role / Device Role / Timing Role: AT24CS16-SSHM-B supplies immutable hardware identity during TLS certificate enrollment and firmware version tracking. Use Value: Factory-programmed serial number enables zero-touch onboarding without manufacturing-line serialization steps or cloud-side ID management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C16D-SSHM-T | Same 16-Kbit density and SOIC-8 package, but lacks factory-programmed serial number; supports only 400 kHz max I²C speed | No built-in unique ID - requires external serialization logic or software-managed ID scheme | Select when cost sensitivity outweighs need for hardware-secured identity and 1 MHz operation is unnecessary |
| M95160-WMN6TP | 16-Kbit SPI EEPROM (not I²C); 5V-tolerant; 20 MHz SPI clock; no serial number; 400 kHz equivalent throughput | Requires SPI host interface and separate GPIO for write protection - incompatible bus protocol | Choose only if existing design uses SPI peripherals and I²C bus is unavailable or congested |
Compared with AT24C16D-SSHM-T, the AT24CS16-SSHM-B adds guaranteed uniqueness and faster bus support but at higher unit cost; versus M95160-WMN6TP, it offers native I²C integration and hardware ID but sacrifices SPI flexibility and voltage tolerance.
Availability
AT24CS16-SSHM-B is available at Aetrix Electronics and suitable for industrial control systems, smart metering infrastructure, and IoT edge node designs requiring stable component supply, long-lifecycle support, and guaranteed-unique device identity.
Supply support for AT24CS16-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 AT24CS16-SSHM-B belongs to Microchip's CS Series Serial EEPROM product line, designed specifically to simplify secure device identification and reduce manufacturing serialization overhead in high-volume embedded systems.
FAQ
What is the purpose of the 128-bit serial number in the AT24CS16-SSHM-B?
The 128-bit serial number in the AT24CS16-SSHM-B is factory-programmed, permanently locked, and globally unique across all Microchip CS Series EEPROMs. It resides in a dedicated read-only memory block separate from the 16-Kbit user EEPROM array. This feature enables secure device authentication, anti-cloning, and zero-touch provisioning without requiring external serialization during manufacturing - the AT24CS16-SSHM-B delivers this capability natively and reliably.
Does the AT24CS16-SSHM-B support 1 MHz I²C operation across its full voltage range?
No - the AT24CS16-SSHM-B supports 1 MHz Fast Mode Plus (FM+) only at VCC = 2.5V to 5.5V. At 1.7V to 2.5V, maximum I²C speed is limited to 400 kHz Fast Mode. This voltage-dependent timing is specified in DS20006342A-page 9 Table 4-3 and ensures signal integrity and noise margin compliance across the operating range of the AT24CS16-SSHM-B.
How does the Write-Protect (WP) pin function on the AT24CS16-SSHM-B?
The WP pin on the AT24CS16-SSHM-B is an active-high hardware lock: when driven to VCC, it inhibits all write operations to the full 16-Kbit array; when grounded, writes are enabled. If left floating, it is internally pulled down to GND - but Microchip recommends tying it explicitly to avoid noise-induced misoperation. This behavior is documented in DS20006342A-page 5 Table 2-2 and applies identically to the AT24CS16-SSHM-B variant.
What is the maximum write endurance and data retention specification for the AT24CS16-SSHM-B?
The AT24CS16-SSHM-B guarantees 1,000,000 write cycles and 100 years of data retention at 55°C, as verified through qualification testing per DS20006342A-page 12 Table 4-6. These values reflect actual measured performance under accelerated stress conditions and apply directly to the AT24CS16-SSHM-B in its specified industrial temperature range (-40°C to +85°C).
Can the AT24CS16-SSHM-B be used in 1.8V systems?
Yes - the AT24CS16-SSHM-B operates down to 1.7V, making it fully compatible with 1.8V logic systems. It supports I²C Standard Mode (100 kHz) and Fast Mode (400 kHz) across the full 1.7V–5.5V range, with appropriate pull-up resistor sizing (e.g., 10 kΩ for 400 kHz at 1.8V). All DC and AC specifications in DS20006342A-page 9–10 are validated for 1.7V operation, confirming robust functionality for the AT24CS16-SSHM-B in low-voltage embedded designs.
AT24CS16-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:
- 16Kbit
- Memory Organization:
- 2K 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
AT24CS16-SSHM-B FAQ
1.How can I place an order for AT24CS16-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS16-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 AT24CS16-SSHM-B reliable?
The price and inventory of AT24CS16-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 AT24CS16-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS16-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS16-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS16-SSHM-B?
AT24CS16-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS16-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 AT24CS16-SSHM-B?
For technical support, including AT24CS16-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS16-SSHM-B requirements.
6.How does Aetrix verify that AT24CS16-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS16-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 AT24CS16-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS16-SSHM-B?
All AT24CS16-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS16-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 AT24CS16-SSHM-B part is unused and in its original packaging.
Return procedure for AT24CS16-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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