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Microchip Technology AT24CS16-MAHM-T
- Part No.:
- AT24CS16-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS16-MAHM-T.pdf
- Description:
- IC EEPROM 16KBIT I2C 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,860
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Product details
Overview
AT24CS16-MAHM-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 across -40°C to +85°C, used for secure device identification and nonvolatile configuration storage in embedded systems.
For engineers reviewing the AT24CS16-MAHM-T datasheet, AT24CS16-MAHM-T pinout, AT24CS16-MAHM-T application, or AT24CS16-MAHM-T equivalent, key selection criteria include I²C Fast Mode Plus support (1 MHz at 2.5–5.5V), hardware write protection via WP pin, ultra-low standby current (≤6 µA), and guaranteed uniqueness of the 128-bit serial number across all CS Series devices.
Technical Context
The AT24CS16-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing. It features an internal high-voltage generation circuit enabling byte/page writes without external VPP.
Memory is partitioned into 128 pages of 16 bytes each, with separate address space (device type identifier '1011') for the read-only 128-bit serial number block-physically isolated from user EEPROM and permanently locked during wafer fabrication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2,048 × 8), sufficient for firmware versioning, calibration data, and device-specific parameters |
| Interface | I²C two-wire, compatible with standard, fast, and fast mode plus (1 MHz @ 2.5–5.5V) |
| Supply Voltage | 1.7V to 5.5V - supports single-supply operation across 1.8V, 3.3V, and 5V logic domains |
| Write Endurance | 1,000,000 cycles - enables frequent logging or counter updates in industrial control nodes |
| Data Retention | 100 years at 55°C - ensures long-term reliability in sealed or inaccessible deployments |
| Standby Current | ≤6 µA at 5.5V - minimizes battery drain in always-on IoT edge sensors |
| Serial Number | 128-bit factory-programmed, read-only, globally unique across entire CS Series - eliminates need for external serialization infrastructure |
Pinout & Package
AT24CS16-MAHM-T is supplied in an 8-lead SOIC package (JEDEC MS-012) with 1.27 mm pitch. Pin 1 is top-left corner when notch faces up; pins 1–4 are top row left-to-right, pins 5–8 are bottom row right-to-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND - no electrical function |
| 2 (NC) | No Connect | Internally unconnected; no routing or bonding - no impact on operation |
| 3 (NC) | No Connect | Internally unconnected; not used in any SOIC variant - no signal path |
| 4 (GND) | Ground Reference | System return path for VCC and I/O; must be low-impedance connection to minimize noise coupling |
| 5 (SDA) | Serial Data I/O | Open-drain bidirectional bus line; requires 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; filtered for EMI resilience |
| 7 (WP) | Hardware Write Protect | Active-high enable: tied to VCC blocks all writes; tied to GND enables full array access; internally pulled down if floating |
| 8 (VCC) | Power Supply | 1.7–5.5V supply; must ramp monotonically at ≤0.1 V/µs; decoupling capacitor (0.1 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Serialized 128-bit ID | Permanently programmed during wafer test; occupies dedicated memory space outside user array; ensures traceability without consuming EEPROM capacity |
| Hardware Write Protection | Pin-controlled full-array lock (WP = VCC) - prevents accidental or malicious overwrites during field operation or firmware updates |
| Ultra-Low Power Operation | 3 mA max active current and 6 µA max standby current at 5.5V - extends battery life in portable medical or sensor nodes |
| Noise-Resilient I²C Interface | Schmitt-trigger inputs and spike suppression filters on SDA/SCL - maintains reliable communication in electrically noisy industrial environments |
| Page Write Architecture | 16-byte page buffer allows partial writes; self-timed erase/write completes within 5 ms - reduces bus occupancy vs. byte-by-byte programming |
Applications
| Secure Device Authentication | Firmware Configuration Storage |
|---|---|
Use Scenario: Embedded gateway authenticates peripheral modules during boot using cryptographic challenge-response with device-unique serial number. IC Role / Device Role / Timing Role: AT24CS16-MAHM-T provides immutable, factory-assigned identity source for PKI key binding and anti-cloning verification. Use Value: Eliminates need for external secure element or software-based serialization, reducing BOM cost and boot-time latency. | Use Scenario: Industrial PLC stores calibrated sensor offsets, network MAC addresses, and operational thresholds persistently across power cycles. IC Role / Device Role / Timing Role: AT24CS16-MAHM-T serves as nonvolatile configuration register bank accessible via standard I²C during system initialization. Use Value: Enables field-upgradable calibration and zero-touch provisioning without requiring flash reprogramming or JTAG access. |
| Asset Tracking Tag Memory | Smart Meter Parameter Vault |
Use Scenario: Battery-powered BLE asset tag records last-known GPS coordinates, tamper events, and uptime counters between transmissions. IC Role / Device Role / Timing Role: AT24CS16-MAHM-T acts as low-power, high-endurance data logger with deterministic 5 ms write latency per page. Use Value: Supports >10 years of daily logging at 1,000,000 write cycles - outlasting typical battery lifetime in maintenance-free deployments. | Use Scenario: Utility smart meter retains tariff schedules, billing registers, and security certificates through grid outages and firmware updates. IC Role / Device Role / Timing Role: AT24CS16-MAHM-T functions as tamper-resistant parameter vault with hardware WP pin enabled during normal operation. Use Value: Prevents unauthorized modification of revenue-critical data while maintaining compatibility with legacy I²C metering SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C16D-MAHM-T | No factory-programmed serial number; identical 16-Kbit I²C architecture, same SOIC-8 package and pinout | Lacks device-level uniqueness - requires external serialization or software-managed IDs | Select when cryptographic identity is unnecessary and lowest unit cost is prioritized |
| M95160-WMN6TP | 16-Kbit SPI interface (not I²C); 2.5–5.5V operation; 1 MHz max clock; no built-in serial number | Requires SPI host controller instead of I²C; incompatible bus protocol and command set | Select only when board already uses SPI peripherals and I²C bus is congested or unavailable |
Compared with AT24CS16-MAHM-T, AT24C16D-MAHM-T offers identical memory density and packaging but omits the 128-bit serial number-reducing cost where device authentication isn't required-while M95160-WMN6TP mandates SPI hardware redesign and forfeits factory serialization entirely.
Availability
AT24CS16-MAHM-T is available at Aetrix Electronics and suitable for secure authentication, firmware configuration storage, and asset tracking applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT24CS16-MAHM-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and support infrastructure.
The AT24CS16-MAHM-T belongs to Microchip's CS Series Serial EEPROM product line, engineered specifically for applications demanding guaranteed device uniqueness, low-voltage operation, and robust I²C interoperability in industrial and IoT endpoints.
FAQ
What is the function of the WP pin on the AT24CS16-MAHM-T?
The WP (Write-Protect) pin on the AT24CS16-MAHM-T is an active-high hardware control that disables all write operations to the EEPROM array when driven to VCC. When tied to GND, full read/write access is enabled. If left floating, it is internally pulled down to GND, but Microchip recommends connecting it to a defined voltage level to prevent noise-induced corruption. This feature ensures data integrity during power transitions or system resets in the AT24CS16-MAHM-T.
Does the AT24CS16-MAHM-T support 1 MHz I²C communication?
Yes, the AT24CS16-MAHM-T supports I²C Fast Mode Plus at up to 1 MHz-but only when VCC is between 2.5V and 5.5V. At lower voltages (1.7V–2.5V), it operates in Fast Mode (400 kHz max) or Standard Mode (100 kHz max). The AC timing specifications-including tLOW, tHIGH, and tBUF-are explicitly defined for 1 MHz operation in the official datasheet DS20006342A, confirming full compliance for high-speed host controllers interfacing with the AT24CS16-MAHM-T.
How is the 128-bit serial number accessed on the AT24CS16-MAHM-T?
The 128-bit serial number on the AT24CS16-MAHM-T is accessed via a dedicated I²C address space using device type identifier '1011' (0xBx) instead of the standard '1010' (0xAx) used for EEPROM reads. It resides in a physically separate, factory-locked memory block outside the 16-Kbit user array and is read-only-no write commands affect it. The AT24CS16-MAHM-T guarantees uniqueness across all CS Series devices, making it ideal for secure device onboarding without additional hardware.
What is the maximum write cycle time for the AT24CS16-MAHM-T?
The maximum write cycle time for the AT24CS16-MAHM-T is 5 ms for both byte and page writes, as specified in the Electrical Characteristics table (tWR) of datasheet DS20006342A. This self-timed internal erase-and-program operation completes autonomously after the host issues the final ACK; no polling is required beyond standard acknowledge polling. This fixed 5 ms latency applies uniformly across all VCC levels and temperature ranges for the AT24CS16-MAHM-T.
Is the AT24CS16-MAHM-T RoHS compliant and lead-free?
Yes, the AT24CS16-MAHM-T is RoHS compliant and offered in green package options including lead-free and halide-free construction, as confirmed in the "Green Package Options" section of the official datasheet DS20006342A. The SOIC-8 package (MAHM) meets JEDEC standards for Pb-free soldering profiles and carries appropriate marking per Microchip's packaging documentation. All units shipped by Aetrix Electronics for the AT24CS16-MAHM-T conform to current EU RoHS Directive 2011/65/EU requirements.
AT24CS16-MAHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- 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:
- 8-UDFN (2x3)
AT24CS16-MAHM-T FAQ
1.How can I place an order for AT24CS16-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS16-MAHM-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-MAHM-T reliable?
The price and inventory of AT24CS16-MAHM-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-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS16-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS16-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS16-MAHM-T?
AT24CS16-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS16-MAHM-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-MAHM-T?
For technical support, including AT24CS16-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS16-MAHM-T requirements.
6.How does Aetrix verify that AT24CS16-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS16-MAHM-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-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS16-MAHM-T?
All AT24CS16-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS16-MAHM-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-MAHM-T part is unused and in its original packaging.
Return procedure for AT24CS16-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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