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Microchip Technology AT24C32D-MAPD-E
- Part No.:
- AT24C32D-MAPD-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24C32D-MAPD-E.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,032
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Product details
Overview
AT24C32D-MAPD-E from Microchip Technology is a 32-Kbit I²C-compatible automotive-grade serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 5.5V (Grade 3) or 2.5V to 5.5V (Grade 1), with AEC-Q100 qualification, -40°C to +125°C temperature range, and 1,000,000 write endurance - used for storing calibration data, configuration parameters, and fault logs in engine control units and ADAS modules.
For engineers reviewing the AT24C32D-MAPD-E datasheet, AT24C32D-MAPD-E pinout, AT24C32D-MAPD-E application, or AT24C32D-MAPD-E equivalent, key selection criteria include I²C fast-mode timing compliance (400 kHz), hardware write-protection via WP pin, 5 ms max self-timed write cycle, ultra-low standby current (≤6 μA), and 5-lead SOT23 package compatibility with space-constrained automotive PCBs.
Technical Context
The AT24C32D-MAPD-E implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting standard (100 kHz) and fast (400 kHz) modes. It uses internal address decoding with three hardware-selectable device address pins (A0–A2) enabling up to eight devices on one bus.
Memory is organized into 128 pages of 32 bytes each, supporting partial-page writes and random/sequential reads. Write protection is enforced via dedicated WP pin tied to VCC (full array lock) or GND (normal operation), with internal pull-downs ensuring defined state when unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8 bits) - sufficient for firmware revision stamps, sensor calibration coefficients, and diagnostic event history in Tier-1 automotive ECUs. |
| Interface | I²C two-wire serial (100/400 kHz) - compatible with standard microcontroller I²C peripherals without protocol translation or level-shifting overhead. |
| Supply Voltage | 1.7V to 5.5V (Grade 3) - supports wide-input automotive power rails including post-regulated 3.3V and 5V domains. |
| Operating Temp | -40°C to +125°C (AEC-Q100 Grade 1) - qualified for under-hood and transmission-control module environments. |
| Write Endurance | 1,000,000 cycles - enables daily reprogramming over 27 years at 100 writes/day, suitable for dynamic parameter logging. |
| Data Retention | 100 years at 55°C - ensures long-term integrity of safety-critical configuration data across vehicle lifetime. |
| Standby Current | ≤6 μA at 5.0V - minimizes quiescent power draw in always-on vehicle networks (e.g., CAN wake-up circuits). |
| Write Cycle Time | ≤5 ms max - enables rapid nonvolatile storage during critical system events without blocking main CPU execution. |
Pinout & Package
AT24C32D-MAPD-E is supplied in a 5-lead SOT23 package - compact (2.9 mm × 1.6 mm × 1.1 mm), surface-mount, RoHS-compliant, and optimized for high-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | Serial Clock Input | Asynchronous master-controlled clock line; rising edge latches input data, falling edge outputs data - requires external pull-up resistor (≤10 kΩ). |
| GND | Ground Reference | System return path for VCC and all I/O signals; must be low-impedance connection to minimize noise coupling into EEPROM logic. |
| SDA | Serial Data Bidirectional I/O | Open-drain bus line shared across multiple I²C slaves; requires external pull-up and supports wire-OR logic for multi-master arbitration. |
| WP | Hardware Write-Protect Input | Logic-high (VCC) disables all writes to memory array; internally pulled down when floating - prevents accidental corruption during power transients. |
| VCC | Power Supply Input | Single-supply rail powering internal charge pump, memory array, and interface logic; slew rate ≤0.1 V/µs required for reliable POR behavior. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 Qualification | Validated for automotive under-hood applications (-40°C to +125°C), including thermal cycling, vibration, and ESD (>3 kV HBM) stress testing. |
| 32-Byte Page Write Mode | Enables efficient burst programming of calibration tables without requiring full-array erase - reduces total write time by >90% vs. byte-by-byte writes. |
| Schmitt-Trigger Inputs with Filtering | Rejects bus noise spikes <100 ns duration and suppresses EMI-induced glitches - eliminates spurious Start/Stop detection in noisy engine bays. |
| Internal Power-on Reset (POR) | Guarantees device remains in Standby until VCC stabilizes ≥2.5V and tPUP ≥100 µs elapses - prevents command corruption during cold cranking. |
| Green Packaging | Lead-free, halide-free, RoHS-compliant SOT23 - meets global automotive environmental compliance mandates (ELV, REACH, IMDS). |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing real-time fuel trim adjustments, misfire counters, and OBD-II diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding adaptive learning values updated at 10–100 Hz during closed-loop operation. Use Value: Enables zero-latency recall of calibrated parameters after power loss, maintaining emissions compliance and drivability without boot-time recalibration delays. |
Use Scenario: Retaining camera lens calibration offsets, radar beam alignment matrices, and sensor fusion bias corrections after vehicle shutdown. IC Role / Device Role / Timing Role: Persistent memory node interfacing directly with SoC I²C controller during system initialization and runtime updates. Use Value: Supports field-upgradable ADAS features by allowing secure, authenticated firmware patch storage with hardware write-lock during active driving. |
| Body Control Module (BCM) | Transmission Control Module (TCM) |
|
Use Scenario: Saving user preferences (seat position, mirror angle, lighting profiles) and door lock actuation history for personalized vehicle entry. IC Role / Device Role / Timing Role: Low-power I²C slave accessed only during wake-up events or CAN message triggers - remains in <6 μA standby between operations. Use Value: Extends battery life in parked vehicle mode while preserving personalization data across 15+ year service life. |
Use Scenario: Logging gear shift timing anomalies, torque converter clutch engagement statistics, and oil temperature history for predictive maintenance. IC Role / Device Role / Timing Role: High-reliability data logger synchronized to CAN bus timestamps, writing 32-byte bursts per shift event. Use Value: Provides OEMs with traceable, tamper-resistant service records compliant with ISO 26262 ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C32-DFMN6TP | Same 32-Kbit I²C EEPROM, AEC-Q100 Grade 1, but uses 8-lead SOIC package (larger footprint); no 5-lead SOT23 option. | Requires PCB layout change for SOT23-to-SOIC adaptation; lacks identical mechanical fit in tight BCM enclosures. | Select when board space permits SOIC and legacy ST ecosystem integration is prioritized over miniaturization. |
| ON Semiconductor CAT24C32HU4I-GT3 | 32-Kbit I²C EEPROM, AEC-Q100 Grade 2 (-40°C to +105°C), 5-lead SOT23 package, but rated only to 100 kHz I²C speed. | Not suitable for 400 kHz fast-mode systems (e.g., high-speed ADAS sensor hubs); limited temperature margin vs. Grade 1. | Select only for cost-sensitive Grade 2 applications where 100 kHz timing and +105°C ceiling are sufficient. |
Compared with AT24C32D-MAPD-E, the M24C32-DFMN6TP offers identical functionality but demands PCB redesign due to SOIC packaging, while the CAT24C32HU4I-GT3 sacrifices I²C speed and temperature grade to meet lower-cost targets - making AT24C32D-MAPD-E the sole option balancing Grade 1 qualification, 400 kHz performance, and 5-lead SOT23 miniaturization.
Availability
AT24C32D-MAPD-E is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and transmission control modules requiring stable component supply across extended automotive production lifecycles.
Supply support for AT24C32D-MAPD-E 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 broad automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The AT24C32D-MAPD-E belongs to Microchip's AEC-Q100-qualified serial EEPROM product line, designed specifically for reliable nonvolatile data storage in harsh automotive environments where voltage transients, thermal extremes, and long service life are critical.
FAQ
What is the maximum I²C clock frequency supported by the AT24C32D-MAPD-E?
The AT24C32D-MAPD-E supports I²C Fast Mode up to 400 kHz, verified across its full operating voltage (1.7V–5.5V) and temperature range (-40°C to +125°C). This allows high-throughput configuration updates in ADAS and powertrain systems without introducing bus bottlenecks. The AT24C32D-MAPD-E meets AC timing specifications including tLOW ≥1,200 ns and tHIGH ≥600 ns at 400 kHz.
Does the AT24C32D-MAPD-E require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C32D-MAPD-E requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is an input-only pin. Microchip specifies maximum pull-up resistance of 10 kΩ; for 400 kHz operation, a 1.3 kΩ resistor is recommended to meet rise-time requirements (tR ≤300 ns). The AT24C32D-MAPD-E does not integrate internal pull-ups.
How does the Write-Protect (WP) pin function on the AT24C32D-MAPD-E?
When the WP pin of the AT24C32D-MAPD-E is driven high (VCC), all write operations to the entire 32-Kbit memory array are inhibited - protecting stored calibration data during system power-up or EMI events. When WP is low (GND), normal read/write access is enabled. The pin is internally pulled down, but Microchip recommends hard-wiring it to avoid noise-induced false protection activation.
What is the memory organization of the AT24C32D-MAPD-E?
The AT24C32D-MAPD-E organizes its 32,768 bits as 4,096 words of 8 bits each, segmented into 128 pages of 32 bytes. This structure enables efficient page-write operations - allowing up to 32 bytes to be written in a single I²C transaction with ≤5 ms completion time. The AT24C32D-MAPD-E supports both random and sequential read modes without address wraparound limitations.
Is the AT24C32D-MAPD-E compatible with standard I²C protocol stacks?
Yes, the AT24C32D-MAPD-E is fully compliant with the standard I²C specification, including Start/Stop condition generation, 7-bit slave addressing (with A0–A2 hardware select), ACK/NACK handshaking, and 9-clock-cycle per-byte transfer timing. It requires no custom drivers and integrates seamlessly with Linux i2c-dev, FreeRTOS I²C middleware, and bare-metal HAL implementations - confirmed in Microchip's AN2478 application note for AT24C32D-MAPD-E.
AT24C32D-MAPD-E 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:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT24C32D-MAPD-E FAQ
1.How can I place an order for AT24C32D-MAPD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32D-MAPD-E 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-MAPD-E reliable?
The price and inventory of AT24C32D-MAPD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32D-MAPD-E is usually 5 days.
3.What payment methods are accepted for AT24C32D-MAPD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32D-MAPD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32D-MAPD-E?
AT24C32D-MAPD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32D-MAPD-E 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-MAPD-E?
For technical support, including AT24C32D-MAPD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32D-MAPD-E requirements.
6.How does Aetrix verify that AT24C32D-MAPD-E is sourced from the original manufacturer or authorized distributors?
All AT24C32D-MAPD-E 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-MAPD-E meets industry standards.
7.What is the process for return or replacement of AT24C32D-MAPD-E?
All AT24C32D-MAPD-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32D-MAPD-E, 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-MAPD-E part is unused and in its original packaging.
Return procedure for AT24C32D-MAPD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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