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Microchip Technology 24LC32AT-E/MC
- Part No.:
- 24LC32AT-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
24LC32AT-E/MC.pdf
- Description:
- IC EEPROM 32KBIT I2C 400KHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:18,498
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Product details
Overview
24LC32AT-E/MC from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial-extended temperature range (–40°C to +125°C). It features hardware write-protection, 32-byte page write buffer, and 1 µA standby current - deployed in automotive body control modules for configuration storage and calibration data retention.
For engineers reviewing the 24LC32AT-E/MC datasheet, 24LC32AT-E/MC pinout, 24LC32AT-E/MC application, or 24LC32AT-E/MC equivalent, key selection criteria include VCC min/max compatibility, WP pin behavior under high-temperature operation, page boundary handling in firmware, and AEC-Q100 qualification status for automotive use cases.
Technical Context
The 24LC32AT-E/MC implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer supports current-address, random, and sequential read modes, while the 32-byte page buffer enables efficient burst writes within physical page boundaries (0x000–0x01F, 0x020–0x03F, etc.).
Write protection is controlled solely by the WP pin state at the Stop bit of each command; no internal register configuration is required. Acknowledge polling is supported to detect end-of-write-cycle completion without fixed timing delays, enabling deterministic bus arbitration in multi-device systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), single-block organization - eliminates bank switching logic in host firmware. |
| VCC range | 2.5V to 5.5V - compatible with 3.3V and 5V microcontroller I/O domains without level translation. |
| Max clock frequency | 400 kHz at VCC ≥ 2.5V - supports high-throughput configuration updates in real-time systems. |
| Page write buffer | 32 bytes - reduces I²C transaction count by up to 32× versus byte-write for contiguous data. |
| Endurance | 1,000,000 erase/write cycles per page - ensures >10-year reliability in logging applications with daily writes. |
| Data retention | 200 years at +25°C - guarantees nonvolatile storage integrity across product lifecycle without refresh. |
| Temperature range | –40°C to +125°C (Extended grade) - qualified for under-hood automotive environments per AEC-Q100. |
| ESD protection | >4,000V HBM - withstands handling and board-level ESD events without latch-up or parametric shift. |
Pinout & Package
24LC32AT-E/MC uses an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch) with exposed pad optionally connected to VSS. Pin functions are electrically identical across MSOP, SOIC, TSSOP, and DFN variants per Microchip's device family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | LSB of 3-bit hardware address; hardwired to VSS/VCC to select one of eight devices on shared I²C bus. |
| A1 | Chip address input | Middle bit of 3-bit hardware address; determines unique client address (1010 A2 A1 A0 R/W) on bus. |
| A2 | Chip address input | MSB of 3-bit hardware address; enables up to 256 Kbit aggregate memory space with eight devices. |
| VSS | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system GND plane. |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ @ 400 kHz); carries address, data, ACK/NACK. |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transfers; rise/fall times constrained per AC specs (Table 1-2). |
| WP | Write-protect control | Active-high enable: tied to VCC blocks all writes but permits unlimited reads; sampled only at Stop bit. |
| VCC | Power supply | Primary supply for EEPROM core and interface logic; decoupling capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware write-protection | Single-pin (WP) enables/disable of all write operations without firmware overhead or register access. |
| Schmitt-trigger inputs | Input hysteresis ≥0.05 VCC on SDA/SCL eliminates false triggering from slow-rising or noisy signals. |
| Page write capability | 32-byte buffer allows atomic update of configuration blocks - avoids partial-write corruption during power loss. |
| AEC-Q100 qualification | Qualified for automotive Grade 1 (–40°C to +125°C), including HTOL, TC, and ESD stress testing. |
| Self-timed write cycle | Internal timer completes erase/write in ≤5 ms - host uses ACK polling instead of fixed delay for deterministic timing. |
| I²C bus compatibility | Fully compliant with Philips I²C-bus specification (100/400 kHz modes), supporting standard and fast-mode protocols. |
Applications
| Automotive Body Control Unit | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during power-up and user adjustment events. Use Value: AEC-Q100 qualification ensures reliability across thermal cycling; 1 µA standby current extends battery life in always-on modules. |
Use Scenario: Retaining ladder logic parameters, I/O mapping, and calibration offsets after factory commissioning. IC Role / Device Role / Timing Role: Persistent parameter store interfaced to ARM Cortex-M7 host MCU over 400 kHz I²C bus. Use Value: 32-byte page writes reduce configuration save time by 97% vs. byte writes; WP pin prevents accidental overwrite during firmware updates. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Settings |
Use Scenario: Holding flow-rate calibration coefficients and safety thresholds updated during service calibration. IC Role / Device Role / Timing Role: Tamper-resistant data vault with hardware write-lock activated during normal operation. Use Value: 200-year data retention meets ISO 13485 long-term traceability requirements; >4 kV HBM ESD protects against clinical environment discharge. |
Use Scenario: Storing tariff schedules, meter ID, and communication keys in ANSI C12.19-compliant meters. IC Role / Device Role / Timing Role: Secure settings repository accessed during meter boot and remote firmware activation. Use Value: Page write buffer enables full parameter set update in single I²C transaction; extended temperature rating supports outdoor pole-mount installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32AT-I/MC | Same silicon, rated for –40°C to +85°C only; lower cost; no AEC-Q100 qualification. | Acceptable for commercial/industrial indoor applications but not under-hood automotive. | Select when ambient temperature stays below +85°C and automotive qualification is unnecessary. |
| AT24C32D-MAHM-T | 32-Kbit I²C EEPROM from Microchip (Atmel lineage); 1.7V–5.5V VCC; 1 MHz max clock; different pinout (SOT-23-5). | Lacks A0–A2 address pins; supports only single-device bus; higher speed but smaller package limits routing. | Choose for space-constrained designs where multi-device addressing is not required and 1 MHz timing is beneficial. |
Compared with 24LC32AT-E/MC, the 24LC32AT-I/MC offers identical functionality at lower cost for non-automotive use, while the AT24C32D-MAHM-T trades address flexibility and AEC-Q100 compliance for smaller footprint and faster clock - making it suitable only for single-node, high-speed, space-limited applications.
Availability
24LC32AT-E/MC is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical device calibration storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24LC32AT-E/MC 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, serving automotive, industrial, and consumer markets with vertically integrated design and manufacturing.
The 24LC32A family delivers robust, low-power serial EEPROMs optimized for automotive-grade reliability and seamless integration into I²C-based embedded systems requiring persistent, field-updatable configuration storage.
FAQ
What is the maximum clock frequency supported by the 24LC32AT-E/MC?
The 24LC32AT-E/MC supports up to 400 kHz I²C clock frequency when VCC is between 2.5V and 5.5V. At voltages below 2.5V, the maximum clock drops to 100 kHz - but the 24LC32AT-E/MC is not rated for operation below 2.5V, so 400 kHz is its guaranteed maximum operational rate. This enables faster configuration loading than legacy 100 kHz EEPROMs without compromising signal integrity.
How does the WP pin function on the 24LC32AT-E/MC?
The WP (Write-Protect) pin on the 24LC32AT-E/MC is sampled only at the Stop condition of each I²C write command. When tied to VCC, it inhibits all write operations (byte and page) while permitting unlimited reads. When tied to VSS, writes are enabled. The 24LC32AT-E/MC does not require any software initialization to activate WP - it is purely hardware-controlled and immune to firmware glitches.
Can the 24LC32AT-E/MC operate across multiple I²C addresses on the same bus?
Yes - the 24LC32AT-E/MC supports up to eight devices on a single I²C bus using hardware-configurable A0, A1, and A2 pins. These pins form the three most significant bits of the 7-bit client address (1010 A2 A1 A0), allowing unique addressing without software configuration. This capability is fully retained in the 24LC32AT-E/MC MSOP package and is essential for systems with distributed sensor nodes or modular subsystems.
What is the endurance rating of the 24LC32AT-E/MC, and how is it measured?
The 24LC32AT-E/MC is rated for 1,000,000 erase/write cycles per page - not per byte - because page writes trigger full-page erase before programming. This reflects actual usage in firmware that leverages the 32-byte buffer. Endurance is characterized at +25°C and 5.5V, and applies to the entire memory array. The 24LC32AT-E/MC maintains this rating across its full –40°C to +125°C operating range per AEC-Q100 test conditions.
Is the 24LC32AT-E/MC pin-compatible with other packages in the 24XX32A family?
Yes - the 24LC32AT-E/MC (MSOP) shares identical pin numbering and function mapping with 24LC32A variants in SOIC, TSSOP, DFN, and PDIP packages per Microchip's Device Selection Table and Pin Function Table. All share the same A0–A2, VSS, SDA, SCL, WP, VCC pinout order. This enables direct PCB footprint substitution across package types without schematic or layout changes - critical for design reuse and supply chain flexibility.
24LC32AT-E/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
24LC32AT-E/MC FAQ
1.How can I place an order for 24LC32AT-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AT-E/MC 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 24LC32AT-E/MC reliable?
The price and inventory of 24LC32AT-E/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AT-E/MC is usually 5 days.
3.What payment methods are accepted for 24LC32AT-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AT-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AT-E/MC?
24LC32AT-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AT-E/MC 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 24LC32AT-E/MC?
For technical support, including 24LC32AT-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AT-E/MC requirements.
6.How does Aetrix verify that 24LC32AT-E/MC is sourced from the original manufacturer or authorized distributors?
All 24LC32AT-E/MC 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 24LC32AT-E/MC meets industry standards.
7.What is the process for return or replacement of 24LC32AT-E/MC?
All 24LC32AT-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AT-E/MC, 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 24LC32AT-E/MC part is unused and in its original packaging.
Return procedure for 24LC32AT-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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