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Microchip Technology AT24C32E-XHM-T
- Part No.:
- AT24C32E-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C32E-XHM-T.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,854
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Product details
Overview
AT24C32E-XHM-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 across -40°C to +85°C industrial temperature range, featuring hardware write-protection (WP), Schmitt-trigger inputs, and 1 MHz Fast Mode Plus support at 2.5–3.6V - used for configuration storage in embedded controllers and sensor nodes.
For engineers reviewing the AT24C32E-XHM-T datasheet, AT24C32E-XHM-T pinout, AT24C32E-XHM-T application, or AT24C32E-XHM-T equivalent, key selection criteria include VCC voltage range compatibility, I²C bus speed mode support (Standard/Fast/Fast Plus), WP pin functionality, page write capability (32-byte), and industrial-grade reliability (1M write cycles, 100-year data retention).
Technical Context
The AT24C32E-XHM-T implements a two-wire I²C interface with bidirectional SDA and unidirectional SCL, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing at defined VCC ranges. It uses internal address latching and hardware device addressing via A0–A2 pins to enable up to eight devices on one bus.
Memory is organized into 128 pages of 32 bytes each, enabling partial-page writes and random/sequential reads. Write protection is controlled by the WP pin: tied to VCC disables all writes; tied to GND enables full-array writes. Internal power-on reset (POR) ensures reliable initialization with tPUP ≥ 100 µs 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, and device identity storage in compact systems. |
| Supply Voltage | 1.7V to 3.6V - supports direct interfacing with 1.8V and 3.3V microcontrollers without level shifting. |
| I²C Speed Modes | 100 kHz (1.7–3.6V), 400 kHz (1.7–3.6V), 1 MHz (2.5–3.6V) - enables flexible timing selection based on system noise and VCC rail. |
| Write Cycle Time | ≤ 5 ms - deterministic self-timed erase/write allows predictable timeout handling in host firmware. |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - meets long-life requirements for industrial logging and field-upgradeable devices. |
| Standby Current | 0.8 µA max at 3.6V - minimizes battery drain in always-on or energy-harvesting applications. |
| ESD Protection | > 4,000V HBM - enhances robustness against handling and board-level ESD events. |
Pinout & Package
AT24C32E-XHM-T is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with exposed pad, RoHS-compliant and halide-free per Microchip's green packaging standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired to GND or VCC to configure 1 of 8 possible I²C addresses (1010xxx binary prefix); internally pulled down if floating. |
| A1 | Device Address Input | Second address bit; same pull-down behavior and wiring requirement as A0 for multi-device bus addressing. |
| A2 | Device Address Input | Third address bit; enables full 3-bit hardware address space (000–111) when all three pins are externally biased. |
| GND | Ground Reference | System ground connection; required for proper biasing of internal circuitry and noise immunity. |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up resistor (≤10 kΩ) and supports wire-OR with other open-drain devices. |
| SCL | Serial Clock Line | Unidirectional clock input; must be pulled high externally; rising edge latches input data, falling edge outputs data. |
| WP | Write-Protect Control | Hardware lock: driven to VCC disables all writes; driven to GND enables normal operation; internally pulled down if floating. |
| VCC | Power Supply | 1.7–3.6V supply input; must ramp monotonically at ≤0.1 V/µs; POR threshold is 1.5V typical. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write Mode | Enables efficient partial-page updates without erasing full pages - reduces write latency and extends EEPROM lifetime. |
| Schmitt Trigger Inputs | Improves noise immunity on SCL and SDA lines in electrically noisy environments (e.g., motor control, industrial PLCs). |
| Hardware Write Protection | WP pin provides fail-safe, non-volatile memory lock independent of software state - critical for bootloader or security-critical settings. |
| Ultra-Low Standby Current | 0.8 µA max at 3.6V enables multi-year operation on coin-cell batteries in IoT endpoint devices. |
| Fast Mode Plus Support | 1 MHz operation at 2.5–3.6V accelerates bulk configuration loading - cuts boot-time delays in high-throughput systems. |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables in pressure or humidity sensors deployed in HVAC or process control systems. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent sensor parameters accessed during power-up and runtime correction routines. Use Value: Enables field-replaceable sensor modules with calibrated performance out-of-box, eliminating per-unit calibration labor. | Use Scenario: Retaining tariff schedules, metering logs, and cryptographic keys in utility smart meters operating unattended for 10+ years. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for time-critical billing data and secure boot assets, protected by hardware WP pin. Use Value: Meets ANSI C12.22 and DLMS/COSEM compliance requirements for data integrity and 100-year retention under thermal stress. |
| Embedded Controller Configuration | Medical Device Settings Backup |
Use Scenario: Saving user-defined operational modes, communication parameters, and alarm thresholds in programmable logic controllers (PLCs) and HMI panels. IC Role / Device Role / Timing Role: System configuration EEPROM interfaced directly to ARM Cortex-M MCU via I²C, surviving frequent power cycling. Use Value: Ensures consistent behavior after brownouts or maintenance resets - no reconfiguration needed post-power loss. | Use Scenario: Backing up patient-specific therapy parameters and device calibration history in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: FDA Class II-regulated nonvolatile memory storing auditable clinical settings with write-cycle-limited access control. Use Value: Supports IEC 62304 traceability and 1M-write endurance for daily recalibration logs over 10-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-XHM-T | Same 32-Kbit capacity, identical pinout and I²C interface, but manufactured on newer process node with enhanced ESD (6 kV HBM) and lower ICC1 (0.05 mA typical @1.8V). | Preferred for new designs requiring higher ESD robustness or ultra-low active current in battery-powered wearables. | Select AT24C32D-XHM-T if upgrading for improved reliability or lower power; backward compatible in layout and firmware. |
| M24C32-WMN6TP | 32-Kbit I²C EEPROM from STMicroelectronics; supports same 1.7–3.6V range and 1 MHz Fast Mode Plus, but lacks integrated Schmitt triggers and has higher ISB (1 µA max). | Suitable for cost-sensitive consumer electronics where noise immunity is less critical and standby current is not constrained. | Choose M24C32-WMN6TP only when cross-supplier qualification is required and Schmitt-trigger filtering is not needed. |
Compared with AT24C32E-XHM-T, AT24C32D-XHM-T offers measurable improvements in ESD tolerance and active current without layout changes, while M24C32-WMN6TP trades noise immunity and standby efficiency for broader distributor availability - making AT24C32E-XHM-T the balanced choice for industrial designs demanding proven noise resilience and low-power operation.
Availability
AT24C32E-XHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and embedded controller configuration requiring stable component supply across extended product lifecycles.
Supply support for AT24C32E-XHM-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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24C32E-XHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, high-reliability nonvolatile storage in space-constrained industrial and automotive-qualified systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24C32E-XHM-T?
The AT24C32E-XHM-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). Operation above 400 kHz requires VCC ≥ 2.5V and adherence to Fast Mode Plus AC timing specifications including tLOW ≤ 500 ns and tR ≤ 100 ns.
Does the AT24C32E-XHM-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C32E-XHM-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 values of 10 kΩ for SDA and recommends ≤4 kΩ for 400 kHz operation and ≤1.3 kΩ for 1 MHz Fast Mode Plus to meet rise-time requirements.
How does the write-protect (WP) pin function on the AT24C32E-XHM-T?
When the WP pin is driven to VCC, the AT24C32E-XHM-T inhibits all write operations to its entire memory array. When WP is at GND, normal byte and page writes are enabled. If left floating, WP is internally pulled down to GND - but Microchip recommends hardwiring it to avoid noise-induced false protection states.
What is the memory organization of the AT24C32E-XHM-T?
The AT24C32E-XHM-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 32-byte page writes and supports both random and sequential read modes, with address auto-increment during sequential reads.
Is the AT24C32E-XHM-T RoHS compliant and lead-free?
Yes, the AT24C32E-XHM-T is RoHS compliant, lead-free, and halide-free per Microchip's green packaging standard. The "XHM-T" suffix denotes the 8-lead TSSOP package with matte tin finish and符合 JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) rating.
AT24C32E-XHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- 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-TSSOP
AT24C32E-XHM-T FAQ
1.How can I place an order for AT24C32E-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32E-XHM-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-XHM-T reliable?
The price and inventory of AT24C32E-XHM-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-XHM-T is usually 5 days.
3.What payment methods are accepted for AT24C32E-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32E-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32E-XHM-T?
AT24C32E-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32E-XHM-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-XHM-T?
For technical support, including AT24C32E-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32E-XHM-T requirements.
6.How does Aetrix verify that AT24C32E-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C32E-XHM-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-XHM-T meets industry standards.
7.What is the process for return or replacement of AT24C32E-XHM-T?
All AT24C32E-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32E-XHM-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-XHM-T part is unused and in its original packaging.
Return procedure for AT24C32E-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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