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Microchip Technology AT24C32CN-SH-T
- Part No.:
- AT24C32CN-SH-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C32CN-SH-T.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
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Product details
Overview
AT24C32CN-SH-T from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) I²C-compatible serial EEPROM with 1.8–5.5V operation, 32-byte page write capability, hardware write protection via WP pin, and 1 million write cycles endurance. It supports up to 1 MHz clock at 5.0V and 400 kHz at 1.8V, and is used in industrial sensor calibration storage, embedded system configuration retention, and power-meter firmware parameter backup.
For engineers reviewing the AT24C32CN-SH-T datasheet, AT24C32CN-SH-T pinout, AT24C32CN-SH-T application, or AT24C32CN-SH-T equivalent, key selection considerations include its NiPdAu lead finish, MLP2x3 (8Y6) ultra-thin DFN package, 1.8V low-voltage compatibility, Schmitt-trigger noise-immune inputs, and cascading support for up to eight devices on one I²C bus.
Technical Context
The AT24C32CN-SH-T implements a standard two-wire I²C interface with open-drain SDA/SCL pins, internal address comparator for A0–A2 device addressing, and a dedicated hardware write-protect (WP) input that disables all memory writes when pulled high. Its EEPROM array is organized as 128 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.
It features self-timed internal write cycles (≤5 ms), acknowledge polling for host synchronization, and built-in Schmitt-trigger inputs with filtered noise suppression. The device operates across −40°C to +85°C and meets lead-free/halogen-free requirements per JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32,768 bits (4096 words × 8 bits); sufficient for storing boot configuration, calibration coefficients, or event logs in space-constrained embedded systems. |
| Supply Voltage Range | 1.8 V to 5.5 V; enables direct interfacing with 1.8V logic families and backward compatibility with legacy 3.3V/5V microcontrollers. |
| I²C Clock Frequency | Up to 1 MHz at 5.0V, 400 kHz at 1.8V; balances speed and noise immunity for reliable communication in noisy industrial environments. |
| Write Endurance | 1,000,000 write cycles; supports frequent parameter updates in telemetry nodes or programmable logic controllers without premature wear-out. |
| Data Retention | 100 years at +25°C; ensures long-term integrity of stored firmware settings, security keys, or regulatory compliance data across product lifecycles. |
| Page Write Size | 32 bytes per page; allows efficient bulk updates (e.g., sensor offset tables) while minimizing bus occupancy and host CPU overhead. |
| Input Capacitance (SDA) | 8 pF max; limits signal rise/fall time degradation and supports longer I²C bus traces or multi-drop configurations. |
Pinout & Package
AT24C32CN-SH-T is packaged in an 8-lead Ultra Thin Mini-MAP (MLP2x3, JEDEC MO-229 compliant), also designated 8Y6 - a 2.0 mm × 3.0 mm, 0.50 mm pitch, dual-row no-lead DFN package with exposed thermal pad (non-electrical, optional ground tie). Pin 1 is marked by a dot on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to configure one of eight possible I²C slave addresses (0x50–0x57); enables multi-device bus sharing without software arbitration. |
| A1 | Device Address Input | Second bit of 3-bit hardware address; floating pins are internally pulled down if board coupling to VCC <3 pF. |
| A2 | Device Address Input | Most significant bit of device address; determines unique I²C address when multiple AT24C32CN-SH-T units share a bus. |
| GND | Ground Reference | Return path for all internal circuitry; must be connected to system ground plane with low-impedance trace to minimize noise coupling into SDA/SCL. |
| VCC | Power Supply | 1.8–5.5V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable operation during write cycles. |
| WP | Hardware Write Protect | Active-high input; when tied to VCC, blocks all write commands including byte/page writes and memory erase-critical for field-upgrade safety. |
| SCL | Serial Clock Input | Positive-edge sampled clock for data transfer; requires external pull-up resistor (typically 2.2–10 kΩ) to VCC. |
| SDA | Serial Data I/O | Bidirectional open-drain line; shared among multiple I²C devices; requires same pull-up as SCL and supports wire-OR logic. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger, filtered inputs | Suppresses EMI-induced glitches on SDA/SCL lines, enabling robust operation in motor-drive or switching-power-supply proximity. |
| 32-byte page write mode | Reduces I²C transaction count by up to 32× vs. byte writes-cutting firmware execution time and bus contention in real-time control loops. |
| Self-timed write cycle (≤5 ms) | Eliminates need for host to poll status registers or manage timing delays; simplifies driver code and improves deterministic latency. |
| 1.8V–5.5V wide supply range | Supports single-supply designs across battery-powered (1.8V), USB-powered (3.3V), and legacy industrial (5V) platforms without level shifters. |
| Lead-free/halogen-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC JS709B; suitable for export-controlled and environmentally regulated end equipment. |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Retention |
|---|---|
Use Scenario: Storing temperature, pressure, or humidity sensor offset/gain coefficients during factory calibration and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed via I²C during power-up or maintenance mode; retains values across cold resets and brownouts. Use Value: Enables plug-and-play sensor replacement with zero manual reconfiguration; eliminates need for external calibration jigs or PC-based tools. |
Use Scenario: Holding user-defined network settings (IP, subnet, gateway), display brightness, language preference, and alarm thresholds in smart thermostats or HMI panels. IC Role / Device Role / Timing Role: Persistent configuration store updated only on UI change or firmware update; read once at boot, written infrequently. Use Value: Survives 10+ years of power cycling; avoids loss of critical setup after battery depletion or firmware corruption events. |
| Power Meter Firmware Parameter Backup | Programmable Logic Controller (PLC) I/O Mapping Table |
Use Scenario: Backing up tariff schedules, demand-response profiles, and metering constants in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, WP-protected memory segment accessed only by authenticated firmware during scheduled updates or utility command execution. Use Value: Prevents accidental overwrites during field firmware upgrades; maintains regulatory compliance data integrity under hostile grid conditions. |
Use Scenario: Storing digital I/O assignment tables, scan cycle timing parameters, and safety interlock logic states in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Read-on-boot configuration database; written only during commissioning or engineering-mode reprogramming via RS-485 or Ethernet. Use Value: Enables rapid module replacement without re-downloading full project files; reduces machine downtime during maintenance. |
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-WMN6TP | Same 32K-bit capacity, 1.7–5.5V range, and SOIC-8 package; but uses standard SOIC body (8S1) instead of MLP2x3, and lacks NiPdAu finish. | Preferred where PCB layout already accommodates SOIC-8 footprints and RoHS-compliant matte tin is acceptable. | Select when mechanical compatibility with legacy SOIC land patterns is required and thermal profile constraints allow standard tin plating. |
| ON Semiconductor CAT24C32HU4I-GT3 | Identical 32K-bit organization and 1.7–5.5V operation; offered in 8-ball UDFN (2×3 mm) but with different pinout (A0/A1 swapped) and no WP pin-relies on software lock. | Suitable for cost-sensitive consumer electronics where hardware write protection is not mandated by safety standards. | Choose only if design can implement software-based write locking and board layout supports alternate pin mapping; verify I²C timing margins. |
Compared with M24C32-WMN6TP, AT24C32CN-SH-T offers superior solder joint reliability via NiPdAu finish and smaller footprint; versus CAT24C32HU4I-GT3, it provides deterministic hardware-level write blocking essential for industrial firmware integrity.
Availability
AT24C32CN-SH-T is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration retention, and power-meter firmware parameter backup requiring stable component supply across extended production lifecycles.
Supply support for AT24C32CN-SH-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 acquired Atmel in 2016 and now manufactures and supports the AT24C32CN-SH-T as part of its broad serial EEPROM portfolio, emphasizing reliability, longevity, and industrial-grade qualification.
The AT24C32CN-SH-T belongs to Microchip's AT24Cxx family of I²C-compatible EEPROMs, designed specifically for nonvolatile data storage in resource-constrained, low-power, and harsh-environment embedded systems.
FAQ
What is the package type and lead finish of AT24C32CN-SH-T?
AT24C32CN-SH-T uses an 8-lead Ultra Thin Mini-MAP (MLP2x3, JEDEC MO-229) package measuring 2.0 mm × 3.0 mm with 0.50 mm pitch, and features a NiPdAu (nickel-palladium-gold) lead finish for enhanced solderability, corrosion resistance, and wire-bond compatibility. This finish meets IPC-J-STD-006B Class 2 requirements and supports lead-free reflow profiles.
Does AT24C32CN-SH-T support 1.8V operation and what is its maximum I²C clock speed at that voltage?
Yes, AT24C32CN-SH-T supports full functionality from 1.8 V to 5.5 V. At 1.8 V, it operates reliably up to 400 kHz I²C clock frequency, as specified in AC Characteristics tables. This enables integration into ultra-low-power systems such as battery-operated sensors or energy-harvesting nodes without performance compromise.
How does the WP (Write Protect) pin function on AT24C32CN-SH-T?
The WP pin on AT24C32CN-SH-T is an active-high hardware write protect input. When pulled high to VCC, it disables all write operations-including byte writes, page writes, and memory clearing-regardless of I²C command content. When grounded or left floating (with board coupling <3 pF), normal write access is enabled. This provides fail-safe protection against firmware bugs or malicious commands.
Can multiple AT24C32CN-SH-T devices share the same I²C bus, and how is addressing managed?
Yes, up to eight AT24C32CN-SH-T devices can share one I²C bus using hardware address pins A0, A1, and A2. Each pin can be tied high or low to generate a unique 3-bit address extension, resulting in slave addresses from 0x50 to 0x57. Floating address pins are internally pulled down, defaulting to '0'-ensuring predictable behavior in unconfigured layouts.
What is the write endurance and data retention specification for AT24C32CN-SH-T?
AT24C32CN-SH-T guarantees 1,000,000 write cycles per memory location and 100 years of data retention at +25°C. These specifications are production-tested per JEDEC JESD22-A117 and validated across the full industrial temperature range (−40°C to +85°C), making it suitable for mission-critical applications where long-term data integrity is non-negotiable.
AT24C32CN-SH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 550 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C32CN-SH-T FAQ
1.How can I place an order for AT24C32CN-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32CN-SH-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 AT24C32CN-SH-T reliable?
The price and inventory of AT24C32CN-SH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32CN-SH-T is usually 5 days.
3.What payment methods are accepted for AT24C32CN-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32CN-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32CN-SH-T?
AT24C32CN-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32CN-SH-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 AT24C32CN-SH-T?
For technical support, including AT24C32CN-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32CN-SH-T requirements.
6.How does Aetrix verify that AT24C32CN-SH-T is sourced from the original manufacturer or authorized distributors?
All AT24C32CN-SH-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 AT24C32CN-SH-T meets industry standards.
7.What is the process for return or replacement of AT24C32CN-SH-T?
All AT24C32CN-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32CN-SH-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 AT24C32CN-SH-T part is unused and in its original packaging.
Return procedure for AT24C32CN-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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