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Microchip Technology AT24CS16-STUM-T
- Part No.:
- AT24CS16-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24CS16-STUM-T.pdf
- Description:
- IC EEPROM 16KBIT I2C SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,810
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Product details
Overview
AT24CS16-STUM-T 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 supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C speeds and includes hardware write protection via WP pin.
For engineers reviewing the AT24CS16-STUM-T datasheet, AT24CS16-STUM-T pinout, AT24CS16-STUM-T application, or AT24CS16-STUM-T equivalent, this device delivers guaranteed serialization, ultra-low standby current (≤6 µA), page-write capability (16-byte pages), and high reliability (1M write cycles, 100-year data retention) in space-constrained embedded systems requiring traceable identity and nonvolatile configuration storage.
Technical Context
The AT24CS16-STUM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. Its internal architecture integrates a dedicated 128-bit read-only serial number block-physically isolated from user memory and permanently programmed during wafer fabrication.
It features hardware write protection via the WP pin (active-high), power-on reset (POR) with 100 µs tPUP delay, and self-timed write cycles completing in ≤5 ms. Memory is organized into 128 pages of 16 bytes each, supporting byte-write, page-write, random-read, and sequential-read operations with ACK/NACK protocol compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2,048 × 8 bits), sufficient for firmware identifiers, calibration data, or secure device credentials |
| Interface | I²C-compatible two-wire bus: supports 100/400 kHz standard/fast modes and 1 MHz Fast Mode Plus above 2.5V |
| Supply Voltage | 1.7V to 5.5V - enables direct integration with 1.8V, 3.3V, and 5V microcontroller I/O domains without level shifting |
| Standby Current | ≤6 µA at VCC = 5.5V - critical for battery-powered IoT nodes and energy-harvesting systems |
| Write Endurance | 1,000,000 cycles - supports frequent logging or parameter updates in industrial controllers |
| Data Retention | 100 years at 55°C - ensures long-term validity of serialized IDs and calibration constants over product lifetime |
| Serial Number | 128-bit factory-programmed, read-only, globally unique across all CS-series EEPROMs - eliminates external serialization infrastructure |
Pinout & Package
AT24CS16-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 DS20006342A-page 4–5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | System return path; must connect to PCB ground plane for noise immunity and ESD discharge |
| VCC | Device power supply | 1.7–5.5V input; requires local 100 nF decoupling capacitor placed within 2 mm of pin |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up resistor (≤10 kΩ) to VCC for bus arbitration |
| SCL | Serial Clock input | Master-generated clock; rising edge latches input, falling edge outputs data; pull-up required |
| WP | Write-protect control | Active-high hardware lock: tied to VCC disables all writes; floating defaults to GND (write-enabled) |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently written during wafer test; occupies no user memory space and guarantees uniqueness across entire CS series |
| Page-write mode (16-byte pages) | Reduces write time vs. byte-write; partial-page writes supported - improves efficiency in firmware update or log buffering |
| Schmitt-triggered, filtered inputs | Suppresses bus noise and EMI-induced glitches on SDA/SCL - enhances robustness in electrically noisy industrial environments |
| Ultra-low standby current (≤6 µA) | Minimizes quiescent power draw in always-on edge sensors or security modules with infrequent memory access |
| Hardware write protection (WP pin) | Prevents accidental or malicious overwrites of critical configuration or identity data without firmware intervention |
Applications
| Smart Metering | Industrial PLC Modules |
|---|---|
|
Use Scenario: Storing utility-specific calibration coefficients, meter serial ID, and tamper-event logs in electricity/water/gas meters. IC Role / Device Role / Timing Role: Nonvolatile configuration and identity storage with guaranteed uniqueness and long-term data integrity. Use Value: Eliminates need for external serialization during manufacturing; 100-year retention ensures compliance over multi-decade meter lifespans. |
Use Scenario: Holding firmware version stamps, I/O mapping tables, and field-replaceable module identification in programmable logic controllers. IC Role / Device Role / Timing Role: Persistent parameter storage accessible via standard I²C; WP pin prevents runtime corruption during hot-swap events. Use Value: Enables plug-and-play module replacement with automatic identity recognition and configuration loading. |
| Medical Wearables | Automotive Body Control Units |
|
Use Scenario: Securing patient-specific calibration data, sensor offset values, and regulatory compliance identifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power, small-footprint EEPROM for storing immutable device identity and calibrated parameters. Use Value: 1.7V operation supports single-cell Li-ion supply; 6 µA standby extends battery life between firmware updates. |
Use Scenario: Storing vehicle-specific configuration profiles (e.g., mirror position, seat memory, lighting preferences) in body control modules. IC Role / Device Role / Timing Role: Robust, AEC-Q200-aligned nonvolatile memory for user-customizable settings with write-protection against CAN bus transients. Use Value: WP pin prevents inadvertent overwrite during ECU reprogramming; industrial temp range covers under-hood thermal cycling. |
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 | No factory-programmed serial number; identical 16-Kbit capacity, same SOIC/TSSOP/UDFN packages, 1.7–5.5V, 400 kHz max I²C speed | Lacks guaranteed unique ID - requires external serialization infrastructure for device tracking or anti-cloning | Select when serialization is handled in software or by higher-layer protocols, and cost sensitivity outweighs ID assurance needs. |
| M95160-DRMN6TP/K | 16-Kbit SPI interface (not I²C); operates 1.8–5.5V; 20 MHz SPI clock; no built-in serial number; 1M endurance, 40-year retention | Requires SPI host interface and different driver stack; incompatible with I²C-based legacy designs | Choose only if system already uses SPI peripherals and board layout allows re-routing; not drop-in compatible with AT24CS16-STUM-T. |
Compared with AT24CS16-STUM-T, AT24C16D-SSHM-T offers identical memory density and voltage range but omits the 128-bit factory serial number - trading traceability for lower unit cost. M95160-DRMN6TP/K provides faster interface throughput via SPI but introduces protocol incompatibility and lacks hardware-enforced uniqueness, making it unsuitable for identity-critical deployments.
Availability
AT24CS16-STUM-T is available at Aetrix Electronics and suitable for smart metering, industrial PLC modules, medical wearables, automotive body control units, and IoT edge nodes requiring stable component supply, guaranteed serialization, and long-term data integrity.
Supply support for AT24CS16-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 Inc. is a leading provider of microcontrollers, analog, FPGA, and memory solutions, with global design, manufacturing, and support infrastructure focused on embedded control and connectivity.
The AT24CS16-STUM-T belongs to Microchip's CS-series Serial EEPROM family, engineered specifically to embed tamper-resistant, factory-assigned identity into resource-constrained systems while maintaining full compatibility with standard I²C protocols and industrial environmental requirements.
FAQ
What is the function of the WP pin on the AT24CS16-STUM-T?
The WP (Write-Protect) pin on the AT24CS16-STUM-T is an active-high hardware control that, when driven to VCC, disables all write operations to the entire memory array. When left unconnected, it is internally pulled down to GND, enabling normal writes. This feature prevents accidental or malicious overwrites of critical data such as calibration values or the factory-programmed 128-bit serial number. The AT24CS16-STUM-T datasheet specifies that a 10 kΩ or lower pull-up resistor is recommended if external control is needed.
Does the AT24CS16-STUM-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24CS16-STUM-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input. Microchip specifies maximum pull-up values of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation - values chosen to meet rise-time requirements (tR ≤ 300 ns) under 100 pF bus capacitance. The AT24CS16-STUM-T will not communicate reliably without properly sized pull-ups, especially in multi-drop I²C configurations.
How is the 128-bit serial number accessed on the AT24CS16-STUM-T?
The 128-bit serial number on the AT24CS16-STUM-T is accessed via a dedicated I²C address space using device type identifier '1011b' (0xBx) instead of the standard '1010b' (0xAx) used for EEPROM memory. It is read-only, factory-programmed, and physically isolated from user memory - consuming zero bytes of the 16-Kbit array. The AT24CS16-STUM-T datasheet confirms that reading the serial number follows the same I²C protocol as memory reads but requires sending the alternate device address byte with R/W = 1 and word address preset to '10xxxxxx' per Table 6-2.
What is the maximum write cycle time for the AT24CS16-STUM-T?
The maximum write cycle time for the AT24CS16-STUM-T is 5 ms, as specified in the AC Characteristics table (tWR) of the official datasheet. This applies to both byte-write and page-write operations and is self-timed - meaning no external polling is required beyond standard ACK polling. After initiating a write, the host must wait up to 5 ms before issuing the next command. The AT24CS16-STUM-T includes internal high-voltage generation circuitry to perform the write, eliminating the need for external programming voltage sources.
Is the AT24CS16-STUM-T RoHS compliant and lead-free?
Yes, the AT24CS16-STUM-T is RoHS compliant and offered in green package options - explicitly stated as lead-free, halide-free, and compliant with EU Directive 2011/65/EU. The 'STUM-T' suffix denotes the 8-pad UDFN package with matte tin finish and halogen-free molding compound. Microchip confirms full compliance in the "Green Package Options" section of the AT24CS16 datasheet (DS20006342A), and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/85% RH.
AT24CS16-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:
- 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:
- SOT-23-5
AT24CS16-STUM-T FAQ
1.How can I place an order for AT24CS16-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS16-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 AT24CS16-STUM-T reliable?
The price and inventory of AT24CS16-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 AT24CS16-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24CS16-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS16-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS16-STUM-T?
AT24CS16-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS16-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 AT24CS16-STUM-T?
For technical support, including AT24CS16-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS16-STUM-T requirements.
6.How does Aetrix verify that AT24CS16-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS16-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 AT24CS16-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24CS16-STUM-T?
All AT24CS16-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS16-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 AT24CS16-STUM-T part is unused and in its original packaging.
Return procedure for AT24CS16-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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