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Microchip Technology AT24C16C-MA9M-T
- Part No.:
- AT24C16C-MA9M-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24C16C-MA9M-T.pdf
- Description:
- IC EEPROM 16KBIT I2C 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,180
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Product details
Overview
AT24C16C-MA9M-T from Microchip Technology (formerly Atmel) is an automotive-grade 16-Kbit I²C serial EEPROM organized as 2,048 × 8 bits, operating from 1.7V to 5.5V, rated for -40°C to +85°C (Grade 3), and housed in an 8-pad UDFN package. It features hardware write protection via the WP pin, 16-byte page write capability, and supports up to 400kHz I²C bus speed - deployed in vehicle body control modules for parameter storage and calibration data retention.
For engineers reviewing the AT24C16C-MA9M-T datasheet, AT24C16C-MA9M-T pinout, AT24C16C-MA9M-T application, or AT24C16C-MA9M-T equivalent, key selection considerations include Grade 3 automotive qualification, UDFN thermal performance, I²C address compatibility (fixed 1010xxxR/W), and endurance-critical use in infotainment system configuration memory.
Technical Context
The AT24C16C-MA9M-T implements a standard two-wire I²C interface with Schmitt-triggered, noise-filtered SCL/SDA inputs and bidirectional open-drain data transfer. Its internal architecture includes an 11-bit word address counter, 128-page memory organization (16 bytes/page), and a self-timed write cycle with hardware write protection controlled by the WP pin.
It uses no external device address pins (A0–A2 are NC), limiting bus topology to one device per I²C segment unless software-addressed multiplexing is employed. The EEPROM supports byte and page writes, current/random/sequential reads, and acknowledge polling - all compliant with I²C protocol timing requirements at 400kHz maximum clock frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2,048 × 8 bits), enabling storage of firmware flags, sensor offsets, or user preferences in compact automotive ECUs. |
| Supply Voltage Range | 1.7V to 5.5V - supports wide-input power rails common in 12V automotive systems with transient suppression and LDO regulation. |
| Operating Temperature | -40°C to +85°C (Grade 3 per AEC-Q100) - qualified for cabin-mounted modules including HVAC controllers and dashboard displays. |
| I²C Speed | Up to 400 kHz - enables fast configuration loading without blocking main MCU execution in real-time safety-critical subsystems. |
| Endurance & Retention | 1,000,000 write cycles and 100-year data retention - ensures reliable operation over full vehicle lifecycle without field recalibration. |
| Write Protection | Hardware-enabled via WP pin tied to VCC - prevents accidental overwrites during ECU power-up/down sequences or firmware updates. |
| Package | 8-pad UDFN (2.0 mm × 3.0 mm, 0.5 mm pitch) - provides space-constrained mounting on high-density PCBs with improved thermal dissipation vs. SOIC/TSSOP. |
Pinout & Package
AT24C16C-MA9M-T is packaged in an 8-pad UDFN (8MA2) measuring 2.0 mm × 3.0 mm × 0.55 mm, with exposed thermal pad for enhanced heat dissipation in automotive under-hood or cabin environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unused die bond pad; must remain unconnected to avoid parasitic coupling or ESD path disruption. |
| 2 (NC) | No Connect | Unused die bond pad; floating connection has no functional impact but requires no pull-up/down. |
| 3 (NC) | No Connect | Unused die bond pad; not internally bonded - PCB layout may omit trace routing to reduce stub length. |
| 4 (GND) | Ground Reference | Primary return path for internal logic and I²C bus termination; must connect directly to low-impedance ground plane. |
| 5 (VCC) | Power Supply | Supplies core EEPROM logic and I²C interface; requires local 100nF ceramic decoupling within 3 mm of pin. |
| 6 (WP) | Write Protect Input | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables full read/write access. |
| 7 (SCL) | Serial Clock Input | Positive-edge sampled clock for I²C transactions; Schmitt-trigger input rejects <100 ns noise pulses per spec. |
| 8 (SDA) | Serial Data I/O | Open-drain bidirectional line; requires external 1.3–10 kΩ pull-up depending on VCC and bus capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Grade 3 Qualification | AEC-Q100 qualified for -40°C to +85°C operation - validated for reliability in non-engine-compartment automotive applications. |
| 16-byte Page Write Mode | Reduces I²C transaction overhead by up to 15× vs. byte writes - critical for rapid calibration table updates in ADAS sensors. |
| Self-timed Write Cycle (≤5 ms) | Eliminates need for external timeout monitoring; MCU can poll ACK or sleep during write, improving system power efficiency. |
| Schmitt-trigger Inputs with Noise Filtering | Rejects EMI-induced glitches on SCL/SDA lines in noisy vehicle electrical environments - reduces communication errors without software filtering. |
| No Device Address Pins (A0–A2 = NC) | Simplifies PCB routing and eliminates address conflict risk; supports single-device-per-bus topology ideal for dedicated subsystem memory. |
Applications
| Body Control Module (BCM) | Infotainment System Settings |
|---|---|
Use Scenario: Storing door lock configuration, mirror position presets, and lighting profiles across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during battery disconnect events. Use Value: Enables personalized user settings retention without backup capacitor or supercapacitor support. |
Use Scenario: Saving audio equalizer presets, display brightness levels, and Bluetooth pairing history. IC Role / Device Role / Timing Role: Low-power, fast-access configuration memory interfaced directly to application processor's I²C controller. Use Value: Supports sub-100ms boot-time restoration of UI state using 400kHz I²C burst reads. |
| Instrument Cluster Calibration | Seat Memory Controller |
Use Scenario: Holding odometer values, service interval counters, and gauge zero-offset compensation data. IC Role / Device Role / Timing Role: Tamper-resistant storage with hardware write protection enabled during normal operation. Use Value: Prevents unauthorized modification of mileage or safety-critical calibration parameters via WP pin hardwiring to VCC. |
Use Scenario: Recording driver seat position, lumbar support settings, and steering wheel angle for multi-user recall. IC Role / Device Role / Timing Role: High-endurance memory supporting >100,000 seat adjustment cycles over vehicle lifetime. Use Value: Achieves 1M write cycles without wear leveling - eliminates need for complex MCU-based wear-leveling firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C16-RMN6TP | Same 16-Kbit I²C EEPROM, Grade 3 (-40°C to +85°C), SOIC-8 package; lacks UDFN option and has slightly higher ISB (5 μA max @ 5V). | Preferred where legacy SOIC footprint reuse is required; unsuitable for space-constrained UDFN layouts. | Select when board redesign is impractical and thermal constraints permit SOIC packaging. |
| ON Semiconductor CAT24C16WI-GT3 | 16-Kbit I²C EEPROM, Grade 3, TSSOP-8 package; supports 1 MHz I²C mode (vs. 400 kHz max for AT24C16C); same endurance/retention specs. | Better suited for high-throughput logging applications requiring faster write bursts; incompatible pinout vs. UDFN. | Choose when system-level I²C bandwidth exceeds 400 kHz and TSSOP mounting is acceptable. |
Compared with M24C16-RMN6TP and CAT24C16WI-GT3, the AT24C16C-MA9M-T uniquely delivers Grade 3 qualification in a thermally optimized UDFN package with proven noise immunity in automotive cabin environments - making it optimal for new designs prioritizing miniaturization and EMI robustness.
Availability
AT24C16C-MA9M-T is available at Aetrix Electronics and suitable for automotive body control modules, infotainment system configuration storage, and instrument cluster calibration memory requiring stable component supply across extended production lifecycles.
Supply support for AT24C16C-MA9M-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 acquired Atmel in 2016 and maintains its automotive EEPROM portfolio with full AEC-Q100 compliance, long-term product longevity commitments, and global manufacturing traceability.
The AT24C16C series was designed specifically for automotive subsystems requiring reliable, low-voltage, noise-immune nonvolatile memory - targeting body electronics, comfort systems, and human-machine interface modules.
FAQ
What is the operating voltage range for AT24C16C-MA9M-T?
The AT24C16C-MA9M-T operates from 1.7V to 5.5V, supporting both low-voltage microcontrollers and standard 5V automotive logic interfaces. This wide range accommodates power-supply variations typical in vehicle electrical systems, including cold-crank conditions down to 1.7V while maintaining full I²C functionality and write capability. The AT24C16C-MA9M-T is specified for Grade 3 operation across this entire voltage window.
Does AT24C16C-MA9M-T support multiple devices on the same I²C bus?
No - the AT24C16C-MA9M-T has no device address pins (A0–A2 are NC), resulting in a fixed I²C address (1010xxxR/W). Only one AT24C16C-MA9M-T can reside on a given I²C segment without external multiplexing. To support multiple EEPROMs, designers must use an I²C switch like the PCA9546A or select variants with configurable address pins (e.g., AT24C16D).
How does the Write Protect (WP) pin function on AT24C16C-MA9M-T?
When the WP pin of the AT24C16C-MA9M-T is driven high (to VCC), the entire 16-Kbit array is write-protected; only read operations are permitted. When WP is grounded, full read/write access is enabled. If left floating, internal weak pull-down activates only if board coupling to VCC is <3 pF - so Atmel recommends explicit GND connection for predictable behavior. This hardware lock ensures data integrity during power transitions.
What package type is used for AT24C16C-MA9M-T?
The AT24C16C-MA9M-T uses an 8-pad UDFN package (8MA2), measuring 2.0 mm × 3.0 mm with 0.5 mm pitch and 0.55 mm height. It features an exposed thermal pad for improved heat dissipation and is lead-free/halogen-free per RoHS. This compact, low-profile package is optimized for high-density automotive PCBs where SOIC or TSSOP footprints are prohibitive.
Is AT24C16C-MA9M-T qualified to AEC-Q100 standards?
Yes - the AT24C16C-MA9M-T is AEC-Q100 Grade 3 qualified, rated for operation from -40°C to +85°C and tested for reliability under automotive stress conditions including temperature cycling, humidity bias, and ESD. This qualification applies specifically to the MA9M-T variant (UDFN, 1.7–5.5V, Grade 3), as documented in Atmel-8799C datasheet Section 10.2.2.
AT24C16C-MA9M-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT24C16C-MA9M-T FAQ
1.How can I place an order for AT24C16C-MA9M-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C16C-MA9M-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 AT24C16C-MA9M-T reliable?
The price and inventory of AT24C16C-MA9M-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C16C-MA9M-T is usually 5 days.
3.What payment methods are accepted for AT24C16C-MA9M-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C16C-MA9M-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C16C-MA9M-T?
AT24C16C-MA9M-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C16C-MA9M-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 AT24C16C-MA9M-T?
For technical support, including AT24C16C-MA9M-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C16C-MA9M-T requirements.
6.How does Aetrix verify that AT24C16C-MA9M-T is sourced from the original manufacturer or authorized distributors?
All AT24C16C-MA9M-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 AT24C16C-MA9M-T meets industry standards.
7.What is the process for return or replacement of AT24C16C-MA9M-T?
All AT24C16C-MA9M-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C16C-MA9M-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 AT24C16C-MA9M-T part is unused and in its original packaging.
Return procedure for AT24C16C-MA9M-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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