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Microchip Technology AT24C32E-MAHM-T
- Part No.:
- AT24C32E-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24C32E-MAHM-T.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,725
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Product details
Overview
AT24C32E-MAHM-T from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write-protection via WP pin - used for firmware parameter storage in embedded controllers and sensor calibration data retention.
For engineers reviewing the AT24C32E-MAHM-T datasheet, AT24C32E-MAHM-T pinout, AT24C32E-MAHM-T application, or AT24C32E-MAHM-T equivalent, key selection factors include VCC voltage compatibility (1.7–3.6V), I²C bus speed mode support (Standard/Fast/Fast Plus), page write capability (32-byte), endurance (1M cycles), and package-specific pin mapping (8-pad UDFN).
Technical Context
The AT24C32E-MAHM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SCL/SDA inputs and open-drain bidirectional SDA. It supports three clock frequency modes: 100 kHz (1.7–3.6V), 400 kHz (1.7–3.6V), and 1 MHz Fast Mode Plus (2.5–3.6V), with tAA read access times down to 450 ns at 1 MHz.
Internally organized as 128 pages of 32 bytes each, it features hardware address inputs A0–A2 (hardwired or pulled down), a dedicated WP pin for full-array write protection, and Power-on Reset (POR) with 100 µs tPUP delay before command acceptance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8), enabling storage of configuration tables or calibration coefficients in space-constrained systems |
| VCC range | 1.7V to 3.6V - supports direct interfacing with 1.8V and 3.3V microcontrollers without level shifting |
| I²C speed modes | 100 kHz / 400 kHz / 1 MHz FM+ - allows flexible timing budget allocation across low-power and high-throughput applications |
| Write endurance | 1,000,000 cycles - suitable for frequent logging or runtime parameter updates in industrial control nodes |
| Data retention | 100 years at 55°C - ensures long-term reliability for unattended equipment and medical device calibration data |
| Active current | ≤1 mA max - minimizes power draw during active reads/writes in battery-backed systems |
| Standby current | ≤0.8 µA max - enables multi-year operation on coin-cell batteries in IoT endpoint devices |
| Page write size | 32-byte pages with partial-write support - reduces bus occupancy and improves efficiency over byte-write-only alternatives |
Pinout & Package
AT24C32E-MAHM-T is packaged in an 8-pad UDFN (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device address input | Hardwired to GND/VCC to select one of eight possible I²C addresses (1010xxx); internally pulled down if floating |
| A1 | Device address input | Second hardware address bit; enables multi-device bus topology without software address conflict |
| A2 | Device address input | Third hardware address bit; required for cascading up to eight AT24C32E devices on same I²C bus |
| GND | Ground reference | System ground connection; exposed pad may be connected to GND for thermal and EMI performance |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (≤10 kΩ); supports wire-OR with other I²C devices |
| SCL | Serial clock input | Input-only clock line; rising edge latches data, falling edge outputs data; filtered for noise immunity |
| WP | Write-protect control | Hardware lock: tied to VCC disables all writes; tied to GND enables full memory access |
| VCC | Power supply | 1.7–3.6V supply input; POR circuit enforces 100 µs delay before first command after stable VCC |
Key Features
| Feature | Design Value |
|---|---|
| Fast Mode Plus (1 MHz) | Enables sub-millisecond random reads in high-speed sensor fusion systems where latency matters |
| Schmitt-trigger + filtering | Rejects >100 ns spikes on SCL/SDA - eliminates false start/stop detection in electrically noisy motor-control environments |
| 32-byte page write | Reduces I²C transaction count by up to 32× vs. byte writes, lowering host CPU overhead and bus contention |
| Hardware WP pin | Prevents accidental firmware corruption during field updates or brown-out conditions without software intervention |
| Green RoHS-compliant packaging | Meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life and reflow compatibility |
| 100-year data retention | Eliminates need for periodic refresh routines in safety-critical applications like energy metering or medical diagnostics |
Applications
| Industrial Sensor Node | Medical Diagnostic Device |
|---|---|
Use Scenario: Storing calibrated offset/gain values and sensor linearization coefficients across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 100-year data retention and 1M write cycles. Use Value: Eliminates factory recalibration after battery replacement and supports field-updatable calibration profiles without firmware changes. | Use Scenario: Retaining patient-specific therapy parameters and usage logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, low-power parameter storage with hardware write-protection during active delivery. Use Value: Prevents unintended parameter modification during treatment; meets IEC 62304 Class B software safety requirements. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Recording tariff schedules, billing cycle counters, and tamper-event timestamps. IC Role / Device Role / Timing Role: High-reliability data logger with <0.8 µA standby current and −40°C to +85°C operation. Use Value: Enables 10+ year battery-backed operation in AMI meters; withstands outdoor thermal cycling per IEC 62059. | Use Scenario: Storing seat/mirror position presets and lighting configuration profiles in 12V automotive subsystems. IC Role / Device Role / Timing Role: Low-voltage EEPROM compatible with 1.8V MCU I/O and automotive-grade temp range. Use Value: Supports direct interface to 1.8V microcontrollers without level shifters; qualified per AEC-Q100 Grade 2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-MAHM-T | Same 32-Kbit capacity, identical UDFN-8 package, but rated for extended temperature (−40°C to +125°C) and higher ESD (6 kV HBM) | Required for under-hood automotive or industrial ambient >85°C; not needed for standard industrial use | Select AT24C32D-MAHM-T only when extended temperature or enhanced ESD robustness is explicitly required. |
| M24C32-WMN6TP | STMicroelectronics 32-Kbit I²C EEPROM in 8-lead SOIC; supports 1 MHz FM+ only above 2.5V, but offers 3.5 µA standby current (vs. 0.8 µA) | Better suited for legacy SOIC-based designs; higher standby current limits ultra-low-power use cases | Choose M24C32-WMN6TP for drop-in SOIC replacement; avoid for battery-powered designs needing sub-1 µA standby. |
Compared with AT24C32E-MAHM-T, AT24C32D-MAHM-T adds extended temperature and ESD margin at no cost to footprint or interface, while M24C32-WMN6TP trades lower standby current for larger SOIC packaging and reduced low-voltage FM+ support - making AT24C32E-MAHM-T optimal for compact, 1.7–3.6V, industrial-grade applications.
Availability
AT24C32E-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic devices, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT24C32E-MAHM-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 global provider of microcontroller, analog, FPGA, and memory solutions, with leadership in embedded control and nonvolatile storage technologies.
The AT24C32E-MAHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for reliable, low-voltage, low-power configuration and calibration data storage in space-constrained industrial and consumer systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C32E-MAHM-T?
The AT24C32E-MAHM-T supports 100 kHz Standard Mode (1.7–3.6V), 400 kHz Fast Mode (1.7–3.6V), and 1 MHz Fast Mode Plus (2.5–3.6V). At 1.7–2.4V, only Standard and Fast Modes are guaranteed; FM+ requires ≥2.5V. This allows designers to maximize throughput in 3.3V systems while maintaining compatibility with 1.8V microcontrollers in lower-speed modes.
Does AT24C32E-MAHM-T require external pull-up resistors on SDA and SCL lines?
Yes, AT24C32E-MAHM-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is an input. 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. The AT24C32E-MAHM-T datasheet provides exact resistor values based on bus capacitance and target speed to ensure reliable signal rise times.
How does the WP pin function on AT24C32E-MAHM-T?
The WP (Write-Protect) pin on AT24C32E-MAHM-T provides hardware-level write inhibition: when tied to VCC, it blocks all write operations to the entire memory array; when tied to GND, normal writes are enabled. If left floating, it defaults to GND via internal pull-down, but Microchip recommends hardwiring WP to avoid noise-induced glitches. This feature ensures data integrity during power transitions or system resets in the AT24C32E-MAHM-T.
What is the memory organization of AT24C32E-MAHM-T?
The AT24C32E-MAHM-T organizes its 32,768 bits as 4,096 words of 8 bits each, grouped into 128 pages of 32 bytes. This structure enables efficient page writes (up to 32 bytes per transaction) and supports both random and sequential read modes. The page boundary alignment is critical for optimizing write throughput - exceeding a page boundary during a page write triggers an automatic wraparound in the AT24C32E-MAHM-T.
Is AT24C32E-MAHM-T compatible with 1.8V microcontrollers?
Yes, AT24C32E-MAHM-T is fully compatible with 1.8V microcontrollers: it operates from 1.7V to 3.6V, supports I²C Standard Mode (100 kHz) and Fast Mode (400 kHz) across that full range, and features input thresholds (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC) aligned with 1.8V logic levels. Its 0.8 µA standby current and Schmitt-triggered inputs further ensure robust interoperability in mixed-voltage 1.8V/3.3V systems using the AT24C32E-MAHM-T.
AT24C32E-MAHM-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:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 450 ns
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT24C32E-MAHM-T FAQ
1.How can I place an order for AT24C32E-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32E-MAHM-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 AT24C32E-MAHM-T reliable?
The price and inventory of AT24C32E-MAHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32E-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24C32E-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32E-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32E-MAHM-T?
AT24C32E-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32E-MAHM-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 AT24C32E-MAHM-T?
For technical support, including AT24C32E-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32E-MAHM-T requirements.
6.How does Aetrix verify that AT24C32E-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C32E-MAHM-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 AT24C32E-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24C32E-MAHM-T?
All AT24C32E-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32E-MAHM-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 AT24C32E-MAHM-T part is unused and in its original packaging.
Return procedure for AT24C32E-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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