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Microchip Technology 24LC32AT-E/MS
- Part No.:
- 24LC32AT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24LC32AT-E/MS.pdf
- Description:
- IC EEPROM 32KBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
24LC32AT-E/MS 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 via the WP pin, 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in automotive body control modules, industrial sensor nodes, and embedded system configuration storage.
For engineers reviewing the 24LC32AT-E/MS datasheet, 24LC32AT-E/MS pinout, 24LC32AT-E/MS application, or 24LC32AT-E/MS equivalent, key selection criteria include VCC compatibility (2.5–5.5V), extended-temp operation (–40°C to +125°C), MSOP-8 package footprint, I²C address flexibility (A0–A2), and page-write timing (≤5 ms).
Technical Context
The 24LC32AT-E/MS implements a two-wire I²C interface with open-drain SDA/SCL pins, requiring external pull-ups. 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, etc.).
Write protection is controlled solely by the WP pin state at Stop bit sampling; no internal register configuration is required. Acknowledge polling is supported to detect write-cycle completion without fixed delay timing, improving bus efficiency in multi-device systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit), organized as single block - supports full 16-bit addressing (0x000–0xFFF) without bank switching. |
| VCC Range | 2.5V to 5.5V - compatible with 3.3V and 5V logic domains; excludes 1.7V low-voltage operation (reserved for 24AA32A variant). |
| Max Clock Frequency | 400 kHz at VCC ≥ 2.5V - enables faster configuration loading vs. legacy 100 kHz EEPROMs; timing validated per Table 1-2. |
| Page Write Time | ≤5 ms (max) - self-timed erase/write cycle eliminates need for external delay; applies to byte or 32-byte page writes. |
| Endurance & Retention | 1 million erase/write cycles; >200 years data retention - specified at +25°C/5.5V; suitable for infrequent but mission-critical parameter storage. |
| Temperature Range | –40°C to +125°C (Extended grade) - qualified to AEC-Q100 Grade 1, enabling use in under-hood automotive ECUs. |
| ESD Protection | >4,000V HBM - robust against handling and board-level transients without external protection circuitry. |
Pinout & Package
24LC32AT-E/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 3 mm × 3 mm body, 0.65 mm pitch, and exposed pad (optional VSS connection). Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit device address; hardwired to VSS or VCC to select one of eight possible I²C addresses on shared bus. |
| A1 | Chip Address Input | Middle bit of device address; determines unique client address (1010 A2 A1 A0 R/W) per I²C protocol. |
| A2 | Chip Address Input | MSB of device address; enables up to eight 24LC32AT-E/MS devices on same I²C bus for 256 Kbit total space. |
| VSS | Ground Reference | Primary return path for all internal circuits; exposed pad may be connected to VSS for improved thermal performance. |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up (2 kΩ typical for 400 kHz); changes only during SCL low. |
| SCL | Serial Clock Input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input ensures noise immunity at bus edges. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes (reads unaffected); sampled at Stop bit edge. |
| VCC | Power Supply | Single 2.5–5.5V supply; powers EEPROM array, logic, and I/O; decoupling capacitor (0.1 µF) recommended near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs on SDA/SCL | Enables reliable operation in electrically noisy environments (e.g., automotive harnesses) without external filtering components. |
| Output slope control | Reduces ground bounce and EMI during signal transitions - critical for stable I²C communication in mixed-signal PCBs. |
| 32-byte page write buffer | Allows up to 32 bytes to be loaded before initiating internal write cycle, reducing host CPU overhead vs. byte-by-byte writes. |
| Hardware write-protection (WP pin) | Prevents accidental overwrites during power-up/down or firmware glitches - no software dependency or register access needed. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including engine control, lighting, and ADAS subsystems operating at +125°C ambient. |
Applications
| Automotive Body Control Unit | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Storing door lock configuration, mirror position presets, and seat memory profiles in a vehicle BCM. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention across 15+ year vehicle lifetime and repeated ignition cycles. Use Value: Eliminates need for battery-backed SRAM; WP pin prevents corruption during CAN bus transient events or brown-out conditions. |
Use Scenario: Holding factory-calibrated offset/gain coefficients for temperature, pressure, and humidity sensors in IIoT field devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory accessed only during sensor initialization or recalibration. Use Value: Enables field-upgradable calibration without reprogramming MCU firmware; 1M endurance supports periodic recalibration over 10+ years. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Parameters |
Use Scenario: Retaining drug library definitions, dose limits, and alarm thresholds in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory storing FDA-mandated operational constraints and audit logs. Use Value: >200-year data retention meets ISO 13485 long-term traceability requirements; AEC-Q100 qualification supports rigorous reliability testing. |
Use Scenario: Storing tariff schedules, metering constants, and security keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Tamper-evident configuration store with hardware write-lock activated during firmware update windows. Use Value: WP pin integration prevents unauthorized parameter modification; 4 kV ESD rating withstands utility-grade surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32A-I/MS | Same silicon, Industrial temp (–40°C to +85°C); identical pinout, timing, and electrical specs. | Lacks extended-temp qualification; unsuitable for under-hood or high-ambient industrial deployments. | Select when cost sensitivity outweighs extended temperature requirement and AEC-Q100 is not mandated. |
| AT24C32D-MAHM-T | 32-Kbit I²C EEPROM (Microchip acquisition); 1.7–5.5V VCC, 1 MHz max clock, SOIC-8 package only. | Broader voltage range enables 1.8V MCU interfacing; higher speed but incompatible MSOP-8 footprint. | Choose for 1.8V systems or where SOIC-8 layout exists; verify WP functionality and page write behavior match design intent. |
Compared with 24LC32AT-E/MS, the 24LC32A-I/MS offers identical functionality at lower cost but sacrifices extended-temperature capability and AEC-Q100 validation, while the AT24C32D-MAHM-T provides higher speed and wider VCC range but requires PCB redesign due to SOIC-8 packaging.
Availability
24LC32AT-E/MS is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and medical device configuration storage requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC32AT-E/MS 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, serving automotive, industrial, consumer, and communications markets with vertically integrated design and manufacturing.
The 24LC32A family delivers cost-effective, AEC-Q100-qualified serial EEPROMs optimized for robust configuration storage in harsh environments - emphasizing reliability, low-power operation, and I²C interoperability.
FAQ
What is the maximum I²C clock frequency supported by the 24LC32AT-E/MS?
The 24LC32AT-E/MS supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher. This is confirmed in the Device Selection Table and AC Characteristics (Table 1-2) of the official datasheet DS20001713P. Operation at 100 kHz is only required below 2.5V - a condition not applicable to the 24LC32AT-E/MS due to its 2.5V minimum VCC rating.
Does the 24LC32AT-E/MS support write-protection at the hardware level?
Yes, the 24LC32AT-E/MS includes a dedicated Write-Protect (WP) pin that, when tied to VCC, inhibits all write operations (byte or page) while allowing unrestricted reads. The WP state is sampled at the Stop bit of each write command, as documented in Section 2.4 and Figure 6-1 of DS20001713P.
What package type is used for the 24LC32AT-E/MS, and what are its key mechanical dimensions?
The 24LC32AT-E/MS uses an 8-lead MSOP package (Microchip drawing C04-111-MS Rev F) with 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, and 0.80–0.95 mm height. Pin 1 is identified by a beveled corner, and the exposed pad is optional for thermal enhancement. Full mechanical details appear on pages 18–19 of DS20001713P.
How many devices can share the same I²C bus using the 24LC32AT-E/MS?
Up to eight 24LC32AT-E/MS devices can operate on a single I²C bus using the A0, A1, and A2 address inputs to generate unique 3-bit chip addresses. Each combination (e.g., A2A1A0 = 000 to 111) yields a distinct client address (1010 A2 A1 A0 R/W), enabling 256 Kbit aggregate capacity as stated in Section 5.0 and the Device Selection Table.
Is the 24LC32AT-E/MS qualified for automotive applications?
Yes, the 24LC32AT-E/MS carries Extended temperature grade (–40°C to +125°C) and is explicitly AEC-Q100 qualified per Grade 1 requirements, as confirmed in the Features list and Device Selection Table of DS20001713P. This makes it suitable for under-hood and chassis-mounted automotive ECUs.
24LC32AT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
24LC32AT-E/MS FAQ
1.How can I place an order for 24LC32AT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AT-E/MS 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/MS reliable?
The price and inventory of 24LC32AT-E/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 24LC32AT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AT-E/MS?
24LC32AT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AT-E/MS 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/MS?
For technical support, including 24LC32AT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AT-E/MS requirements.
6.How does Aetrix verify that 24LC32AT-E/MS is sourced from the original manufacturer or authorized distributors?
All 24LC32AT-E/MS 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/MS meets industry standards.
7.What is the process for return or replacement of 24LC32AT-E/MS?
All 24LC32AT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AT-E/MS, 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/MS part is unused and in its original packaging.
Return procedure for 24LC32AT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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