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Microchip Technology AT24C32D-MEHM-T
- Part No.:
- AT24C32D-MEHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-XFDFN
- Datasheet:
-
AT24C32D-MEHM-T.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8XDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT24C32D-MEHM-T from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 5.5V across -40°C to +85°C. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C speeds, features hardware write protection via WP pin, and delivers ultra-low standby current (6 μA max) for battery-powered industrial sensor nodes and embedded control systems.
For engineers reviewing the AT24C32D-MEHM-T datasheet, AT24C32D-MEHM-T pinout, AT24C32D-MEHM-T application, or AT24C32D-MEHM-T equivalent, this page provides verified package mapping (8-pad XDFN), validated pin functions (SDA/SCL/WP/A0–A2/GND/VCC), confirmed endurance (1,000,000 cycles), data retention (100 years), and real-world timing behavior including 5 ms max write cycle and Schmitt-triggered noise-immune inputs.
Technical Context
The AT24C32D-MEHM-T implements a true I²C slave interface with bidirectional open-drain SDA and input-only SCL, requiring external pull-up resistors. Its internal address decoder accepts 3-bit hardware slave address (A0–A2) and supports up to eight devices on one bus using 7-bit device addressing (1010xxxR/W).
It uses page-write architecture (32-byte pages) with partial-page write capability and self-timed internal write cycles. Memory is organized as 128 pages × 32 bytes, with random/sequential read modes, ACK polling support, and integrated Power-on Reset (POR) with 100 µs tPUP delay after stable VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8 bits) - sufficient for firmware configuration, calibration data, or device identity storage in compact embedded systems. |
| Supply Voltage Range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters. |
| I²C Speed Modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (FM+) - FM+ mode active only at ≥2.5V, enabling high-throughput updates in power-stable applications. |
| Write Endurance | 1,000,000 cycles - supports frequent logging or parameter adjustment in industrial controllers and smart meters. |
| Data Retention | 100 years at 55°C - ensures long-term reliability for sealed or maintenance-free deployments like medical devices or infrastructure sensors. |
| Standby Current | 6 μA max at 5.0V - minimizes quiescent drain in always-on battery-backed systems such as IoT edge nodes. |
| Write Cycle Time | ≤5 ms - enables deterministic timeout handling in real-time firmware without blocking CPU for extended periods. |
Pinout & Package
AT24C32D-MEHM-T is packaged in an 8-pad XDFN (1.6 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is internally connected to GND per Microchip's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Slave Address Input | Configures LSB of 7-bit I²C device address; pulled down internally if floating - must be tied to known logic level for multi-device bus stability. |
| A1 | Hardware Slave Address Input | Configures middle bit of 7-bit I²C device address; enables up to eight AT24C32D-MEHM-T devices on same bus when hardwired uniquely. |
| A2 | Hardware Slave Address Input | Configures MSB of 7-bit I²C device address; combined with A0/A1, defines full 3-bit hardware address (1010xxxR/W format). |
| GND | Ground Reference | System return path for VCC and all I/O; must be low-impedance connection to minimize noise coupling into SDA/SCL lines. |
| SDA | Serial Data Bidirectional I/O | Open-drain line requiring external pull-up; transmits/receives I²C data and ACK/NACK bits; incorporates Schmitt trigger and noise filter. |
| SCL | Serial Clock Input | Master-generated clock controlling data sampling; rising edge latches input, falling edge outputs data; includes integrated spike suppression. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes to entire memory array; tied to GND enables normal operation. |
| VCC | Power Supply Input | 1.7V–5.5V supply; requires local 100 nF decoupling capacitor placed within 2 mm of pin to suppress switching noise during write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| FM+ I²C Support | 1 MHz operation at 2.5V–5.5V enables 2.5× faster writes vs. standard mode - critical for rapid field firmware patching in production test environments. |
| 32-Byte Page Write | Allows partial-page writes (e.g., 1–32 bytes per transaction), reducing bus occupancy and avoiding unnecessary erase-before-write overhead. |
| Schmitt Trigger Inputs | On SDA and SCL pins suppresses >50 ns noise spikes - eliminates false Start/Stop detection in electrically noisy industrial enclosures. |
| Hardware Write Protection | WP pin disables all write operations globally when driven high - prevents accidental corruption during power brownouts or software faults. |
| Low-Voltage Operation | Full functionality down to 1.7V allows seamless integration with energy-harvesting subsystems and single-cell Li-ion battery designs. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated temperature offset, humidity gain, and nonlinearity correction coefficients in a wireless environmental monitor. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed once at boot; retains values across 10+ year product lifetime without backup battery. Use Value: Eliminates manual recalibration; enables traceable, version-controlled calibration data with 100-year retention guarantee at end-user ambient conditions. |
Use Scenario: Holding patient-specific therapy parameters (e.g., infusion rate limits, alarm thresholds) in a portable insulin pump. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage updated only during clinician programming sessions; WP pin hardwired to prevent runtime modification. Use Value: Meets IEC 62304 Class C safety requirements by ensuring parameter integrity through 1M write cycles and eliminating volatile RAM dependency. |
| Smart Meter Firmware Patching | Automotive Body Control Module |
|
Use Scenario: Storing delta patches applied over PLC or RF link to update meter firmware without full reflash. IC Role / Device Role / Timing Role: High-reliability scratchpad memory holding compressed patch binaries; accessed via FM+ I²C for sub-second transfer. Use Value: Reduces OTA update time by 60% vs. standard-mode EEPROMs, minimizing grid communication window and improving field deployment efficiency. |
Use Scenario: Saving seat position, mirror angle, and lighting preferences in a vehicle's door module. IC Role / Device Role / Timing Role: Low-power persistent storage retaining user settings across ignition cycles; draws ≤6 μA in standby during vehicle sleep mode. Use Value: Enables <10 µA total module sleep current - compliant with ISO 19453-3 automotive battery drain specifications for 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-SSHM-T | Identical electrical specs and memory map; differs only in 8-lead SOIC package (5.0 mm × 4.4 mm) vs. XDFN (1.6 mm × 1.6 mm). | SOIC variant suits through-hole prototyping or legacy PCBs; XDFN required for space-constrained automotive modules. | Select AT24C32D-MEHM-T for new designs targeting miniaturization and automated optical inspection (AOI) compatibility. |
| M24C32-WMN6TP | STMicroelectronics 32-Kbit I²C EEPROM; supports 1 MHz only at 5V (not 2.5V); 1.8V min VCC; 400 kHz max below 2.5V. | Lacks FM+ operation below 5V; lower 1.8V VCC min limits use in 1.7V battery systems. | Choose AT24C32D-MEHM-T when 2.5V–5.5V FM+ operation or 1.7V compatibility is required for ultra-low-power designs. |
Compared with AT24C32D-SSHM-T, the AT24C32D-MEHM-T offers identical functionality in a 75% smaller footprint with AOI-friendly wettable flanks; versus M24C32-WMN6TP, it delivers broader voltage-range FM+ support and guaranteed 1.7V operation - critical for energy harvesting and single-cell Li-ion applications.
Availability
AT24C32D-MEHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT24C32D-MEHM-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified quality management systems and global manufacturing.
The AT24C32D-MEHM-T belongs to Microchip's AT24Cxx family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile data storage in space-constrained, thermally demanding industrial and automotive environments.
FAQ
What is the maximum I²C clock frequency supported by AT24C32D-MEHM-T?
The AT24C32D-MEHM-T supports 100 kHz (Standard mode), 400 kHz (Fast mode), and 1 MHz (Fast Mode Plus) I²C speeds. FM+ operation is guaranteed only at VCC ≥ 2.5V; below that, maximum speed is 400 kHz. All modes operate across the full 1.7V–5.5V supply range, with timing parameters fully characterized per DS20006047A.
Does AT24C32D-MEHM-T require external pull-up resistors on SDA and SCL lines?
Yes, AT24C32D-MEHM-T requires external pull-up resistors on both SDA and SCL lines. SDA is open-drain and must be pulled high; SCL is an input that may be driven or pulled high. 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 to meet rise-time requirements per I²C specification.
How does the Write-Protect (WP) pin function on AT24C32D-MEHM-T?
When WP is driven high (to VCC), AT24C32D-MEHM-T inhibits all write operations to its entire memory array. When WP is low (GND), normal read/write is enabled. If left floating, WP is internally pulled down to GND - but Microchip recommends hardwiring WP to a defined state to prevent noise-induced glitches in industrial environments.
What is the memory organization of AT24C32D-MEHM-T?
AT24C32D-MEHM-T organizes its 32,768 bits as 4,096 words × 8 bits, segmented into 128 pages of 32 bytes each. This structure enables efficient 32-byte page writes with partial-page capability, and supports random/sequential reads using two-byte word addressing (A11–A0) transmitted after the device address byte.
Is AT24C32D-MEHM-T compatible with other AT24Cxx devices on the same I²C bus?
Yes, AT24C32D-MEHM-T uses the standard 1010xxxR/W 7-bit I²C address format, allowing up to eight AT24Cxx devices (e.g., AT24C02, AT24C16, AT24C32) to coexist on one bus. Unique addressing is achieved by hardwiring A0–A2 pins to GND/VCC combinations; all devices share identical protocol timing and ACK/NACK behavior.
AT24C32D-MEHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-XFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K 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-XDFN (1.8x2.2)
AT24C32D-MEHM-T FAQ
1.How can I place an order for AT24C32D-MEHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32D-MEHM-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 AT24C32D-MEHM-T reliable?
The price and inventory of AT24C32D-MEHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32D-MEHM-T is usually 5 days.
3.What payment methods are accepted for AT24C32D-MEHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32D-MEHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32D-MEHM-T?
AT24C32D-MEHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32D-MEHM-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 AT24C32D-MEHM-T?
For technical support, including AT24C32D-MEHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32D-MEHM-T requirements.
6.How does Aetrix verify that AT24C32D-MEHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C32D-MEHM-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 AT24C32D-MEHM-T meets industry standards.
7.What is the process for return or replacement of AT24C32D-MEHM-T?
All AT24C32D-MEHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32D-MEHM-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 AT24C32D-MEHM-T part is unused and in its original packaging.
Return procedure for AT24C32D-MEHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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