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Microchip Technology AT24C32E-XHM-B
- Part No.:
- AT24C32E-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C32E-XHM-B.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,230
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Product details
Overview
AT24C32E-XHM-B 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 2.5–3.6V, and hardware write-protection via WP pin - used for firmware parameter storage in embedded controllers, sensor calibration data retention, and configuration backup in industrial IoT nodes.
For engineers reviewing the AT24C32E-XHM-B datasheet, AT24C32E-XHM-B pinout, AT24C32E-XHM-B application, or AT24C32E-XHM-B equivalent, key selection considerations include its 32-byte page write capability, ultra-low standby current (0.8 µA max), Schmitt-triggered noise-immune I²C interface, and compatibility with multi-device bus addressing using A0/A1/A2 pins.
Technical Context
The AT24C32E-XHM-B implements a two-wire I²C interface with programmable device addressing (A0/A1/A2), internal high-voltage generation for EEPROM writes, and automatic power-on reset (POR) with 100 µs tPUP delay. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing across defined VCC ranges.
Its memory array is partitioned into 128 pages of 32 bytes each, enabling partial page writes and sequential/random reads. Write protection is implemented via dedicated WP pin logic that inhibits all writes when pulled high, while SDA/SCL inputs feature integrated Schmitt triggers and spike suppression filters (≤100 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8 bits) - sufficient for storing bootloader config, device ID, calibration coefficients, or small firmware patches. |
| Supply Voltage | 1.7V to 3.6V - enables direct interfacing with 1.8V/2.5V/3.3V microcontrollers without level shifters. |
| Interface Speed | Up to 1 MHz (Fast Mode Plus, 2.5–3.6V) - reduces write latency for time-critical parameter updates. |
| Write Endurance | 1,000,000 cycles - supports frequent recalibration or logging in field-deployed equipment. |
| Data Retention | 100 years at 55°C - ensures long-term reliability in unattended industrial monitoring systems. |
| Standby Current | 0.8 µA maximum - critical for battery-powered sensors and energy-harvesting edge devices. |
| Operating Temp | –40°C to +85°C - qualified for industrial control cabinets, automotive under-hood modules, and outdoor gateways. |
Pinout & Package
AT24C32E-XHM-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 1.27 mm pitch. The package is RoHS-compliant, halide-free, and green-marked per Microchip's environmental policy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardware-selectable LSB of 3-bit address; tied high/low to enable up to eight devices on same I²C bus. |
| A1 | Device Address Input | Mid-bit of hardware address; floating defaults to logic low via internal pull-down for deterministic boot behavior. |
| A2 | Device Address Input | MSB of hardware address; required for multi-device topology; must be externally biased for reliable operation. |
| GND | Ground Reference | System return path for VCC and signal integrity; connects to PCB ground plane to minimize noise coupling. |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up (≤10 kΩ); supports wire-OR with other I²C peripherals. |
| SCL | Serial Clock Line | Input-only clock line; rising edge latches input data, falling edge outputs data; must be pulled high externally. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables full read/write access. |
| VCC | Power Supply | 1.7–3.6V supply input; includes internal POR circuit requiring monotonic ramp ≤0.1 V/µs and stable VCC ≥1.7V before first command. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write | Enables efficient partial updates without erasing full pages - reduces write time and wear on adjacent bytes. |
| Schmitt Trigger Inputs | Improves noise immunity on SDA/SCL lines in electrically noisy industrial environments (e.g., motor drives, PLCs). |
| Self-Timed Write Cycle | Maximum 5 ms internal write completion - eliminates need for host polling or fixed delays; ACK polling supported. |
| ESD Protection | >4,000V HBM - enhances robustness during handling and in-field hot-plug scenarios. |
| Green Packaging | Lead-free, halide-free, RoHS-compliant SOIC - meets global environmental compliance requirements for industrial OEMs. |
Applications
| Industrial Sensor Node | Smart Meter Configuration |
|---|---|
|
Use Scenario: Storing calibrated offset/gain values and timestamped fault logs in battery-powered temperature/humidity sensors deployed in factory floors. IC Role / Device Role / Timing Role: Nonvolatile parameter storage IC with guaranteed 100-year data retention and sub-1 µA standby draw to extend 10-year battery life. Use Value: Eliminates need for external backup capacitors or supercapacitors while maintaining data integrity across power cycles and brownouts. |
Use Scenario: Holding tariff tables, meter ID, and tamper-event history in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure configuration storage with hardware write-protection (WP pin) preventing unauthorized firmware or billing parameter changes. Use Value: Meets ANSI/IEEE security requirements by enabling permanent lock of critical registers after field commissioning. |
| PLC I/O Module | Medical Diagnostic Device |
|
Use Scenario: Saving channel-specific scaling factors and diagnostic thresholds in modular programmable logic controller analog input cards. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfacing directly with 3.3V ARM Cortex-M7 host MCU over 400 kHz I²C bus. Use Value: Supports –40°C to +85°C operation and 1M endurance to withstand repeated calibration in maintenance cycles over 15+ year product lifetime. |
Use Scenario: Archiving patient calibration profiles and regulatory audit trails in portable ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: FDA-aligned nonvolatile memory with documented 100-year retention and 1M write cycles for traceable device history. Use Value: Reduces BOM count by replacing battery-backed SRAM, avoiding electrolytic capacitor aging and leakage risks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-SSHM-T | Same 32-Kbit capacity, identical SOIC-8 package, but rated for extended temp (–40°C to +125°C) and uses newer process node. | Required for under-hood automotive or high-temp industrial enclosures exceeding +85°C ambient. | Select AT24C32D-SSHM-T only if extended temperature qualification is mandatory; otherwise AT24C32E-XHM-B offers cost and lead-time advantage. |
| M24C32-WMN6TP | 32-Kbit I²C EEPROM from STMicroelectronics; supports 1 MHz up to 1.7V (broader low-VCC FM+ range), but WP pin not available in SO8 variant. | Lacks hardware write-protection in standard SO8 - requires software-based locking or external logic for secure config storage. | Choose M24C32-WMN6TP only when lowest possible 1.7V operation at 1 MHz is critical and WP functionality can be implemented elsewhere. |
Compared with AT24C32D-SSHM-T, AT24C32E-XHM-B trades extended temperature rating for lower unit cost and broader distributor availability; versus M24C32-WMN6TP, it provides integrated hardware write protection essential for tamper-resistant industrial firmware storage.
Availability
AT24C32E-XHM-B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering systems, and PLC I/O modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT24C32E-XHM-B 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 manufacturer specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified global manufacturing and design centers.
The AT24C32E-XHM-B belongs to Microchip's AT24Cxx family of I²C EEPROMs, designed specifically for low-power, space-constrained embedded systems needing reliable nonvolatile storage with minimal external components.
FAQ
What is the maximum I²C clock frequency supported by AT24C32E-XHM-B?
The AT24C32E-XHM-B supports 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus). The 1 MHz mode requires VCC between 2.5V and 3.6V. At 1.7–2.4V, only Standard and Fast Modes are guaranteed per DS20006109B.
Does AT24C32E-XHM-B require external pull-up resistors on SDA and SCL lines?
Yes, AT24C32E-XHM-B requires external pull-up resistors on both SDA and SCL. SDA is open-drain and must use ≤10 kΩ; SCL may be driven or pulled up. Recommended values are 4.7 kΩ for 400 kHz and 1.3 kΩ for 1 MHz operation per datasheet AC characteristics.
How does the WP pin function on AT24C32E-XHM-B?
On AT24C32E-XHM-B, the WP pin is active-high: when tied to VCC, it disables all write operations to the entire memory array; when tied to GND, normal read/write is enabled. Floating WP defaults to GND via internal pull-down, but Microchip recommends explicit biasing for reliability.
What is the memory organization of AT24C32E-XHM-B?
AT24C32E-XHM-B organizes its 32,768 bits as 4,096 words × 8 bits, grouped into 128 pages of 32 bytes each. This structure enables efficient 32-byte page writes and supports both random and sequential read modes without address wraparound limitations.
Is AT24C32E-XHM-B compatible with other AT24Cxx devices on the same I²C bus?
Yes, AT24C32E-XHM-B uses the standard I²C device address prefix '1010' and supports hardware address inputs A0/A1/A2, allowing up to eight AT24Cxx devices (including AT24C01 through AT24C512) to coexist on one bus with unique addresses.
AT24C32E-XHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-B FAQ
1.How can I place an order for AT24C32E-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32E-XHM-B 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-B reliable?
The price and inventory of AT24C32E-XHM-B 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-B is usually 5 days.
3.What payment methods are accepted for AT24C32E-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32E-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32E-XHM-B?
AT24C32E-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32E-XHM-B 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-B?
For technical support, including AT24C32E-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32E-XHM-B requirements.
6.How does Aetrix verify that AT24C32E-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24C32E-XHM-B 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-B meets industry standards.
7.What is the process for return or replacement of AT24C32E-XHM-B?
All AT24C32E-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32E-XHM-B, 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-B part is unused and in its original packaging.
Return procedure for AT24C32E-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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