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Microchip Technology AT24C32CN-SH-B
- Part No.:
- AT24C32CN-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C32CN-SH-B.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
AT24C32CN-SH-B from Microchip Technology (formerly Atmel) is a 32K-bit I²C-compatible serial EEPROM organized as 4096 × 8 bits, operating from 1.8 V to 5.5 V, featuring hardware write protection via the WP pin, 32-byte page write capability, and 1 MHz max clock speed at 5.0 V. It is widely used in industrial sensor calibration storage, embedded system configuration retention, and power-meter firmware parameter backup.
For engineers reviewing the AT24C32CN-SH-B datasheet, AT24C32CN-SH-B pinout, AT24C32CN-SH-B application, or AT24C32CN-SH-B equivalent, key selection considerations include its 1.8–5.5 V supply range, 8-lead Ultra Thin Mini-MAP (MLP2x3) package with NiPdAu lead finish, 1 million write endurance, 100-year data retention, and compatibility with standard 2-wire bus protocols across up to eight cascaded devices.
Technical Context
The AT24C32CN-SH-B implements a synchronous 2-wire (I²C) interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting standard-mode (400 kHz at 1.8 V) and fast-mode (1 MHz at 5.0 V) operation. Its internal address counter enables current-address, random-address, and sequential read modes.
It uses three hardware address pins (A0–A2) to support up to eight devices on a shared bus, and features a dedicated Write Protect (WP) pin that disables all writes when pulled high to VCC. The device enters low-power standby mode after STOP condition detection and internal write completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32,768 bits (4096 × 8), enabling storage of firmware settings, calibration coefficients, or user preferences in space-constrained designs |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with both low-voltage microcontrollers (e.g., ARM Cortex-M0+) and legacy 5 V systems without level shifting |
| Interface Protocol | 2-wire I²C-compatible serial bus - reduces PCB routing complexity and pin count versus SPI or parallel EEPROMs |
| Write Cycle Time | ≤5 ms - enables rapid nonvolatile updates during system initialization or field reconfiguration |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention - suitable for applications requiring frequent parameter logging or long-life field deployment |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade operation in metering, automation, and automotive body electronics |
| Package Type | 8-lead Ultra Thin Mini-MAP (MLP2x3), 2.0 mm × 3.0 mm, 0.5 mm pitch - ultra-compact footprint ideal for wearables and IoT edge nodes |
Pinout & Package
AT24C32CN-SH-B is supplied in an 8-lead Ultra Thin Mini-MAP (MLP2x3) package (JEDEC MO-229 compliant), measuring 2.0 mm × 3.0 mm with 0.5 mm pitch and NiPdAu lead finish. The thermal pad is optional and not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired logic level sets LSB of 7-bit I²C slave address; enables multi-device bus addressing (up to 8 units) |
| A1 | Device Address Input | Second bit of hardware-configurable device address; floating pins are internally pulled down if board coupling <3 pF |
| A2 | Device Address Input | MSB of hardware address; allows unique identification on shared I²C bus without software configuration |
| GND | Ground Reference | Return path for VCC and signal logic; must be low-impedance to ensure noise immunity for I²C timing compliance |
| VCC | Power Supply | Single-supply input (1.8–5.5 V); powers internal HV pump, EEPROM array, and serial interface logic |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all write operations, preventing accidental overwrites during power transients |
| SCL | Serial Clock Input | Positive-edge sampled clock for data synchronization; open-drain compatible with bus pull-up resistors |
| SDA | Serial Data I/O | Bidirectional open-drain line shared across multiple I²C devices; requires external pull-up resistor (1.3 kΩ @ 2.5/5 V, 10 kΩ @ 1.8 V) |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode | 32-byte burst writes reduce total programming time by >90% vs. byte-by-byte writes for block updates |
| Noise-Suppressed Inputs | Schmitt-trigger + digital filtering on SDA/SCL ensures reliable operation in electrically noisy industrial environments |
| Hardware Write Protection | WP pin provides fail-safe, zero-software-overhead memory locking - critical for safety-critical configuration storage |
| Low Standby Current | 1.0 µA at 1.8 V enables multi-year battery life in energy-harvesting or coin-cell-powered sensors |
| Cascadable Architecture | Three address pins allow up to eight AT24C32CN-SH-B devices on one I²C bus - simplifies BOM consolidation in multi-sensor modules |
Applications
| Smart Energy Metering | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing tariff schedules, pulse-count history, and metrology calibration constants in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via I²C during boot and periodic firmware updates; retains data across 10+ year service life. Use Value: Enables field-upgradable metering algorithms without requiring external FRAM or battery-backed SRAM. | Use Scenario: Saving I/O mapping tables, PID tuning parameters, and alarm thresholds in modular programmable logic controllers. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to ARM-based controller MCU; written during commissioning and read at power-on reset. Use Value: Eliminates manual dip-switch setup and supports remote parameter reprogramming via HMI or cloud interface. |
| Medical Sensor Calibration | Automotive Body Control Module |
Use Scenario: Holding factory-calibrated offset/gain coefficients for temperature, pressure, and humidity sensors in portable diagnostic devices. IC Role / Device Role / Timing Role: Read-only during normal operation; written once during end-of-line test using I²C host; accessed during sensor initialization. Use Value: Ensures traceable, NIST-aligned accuracy without requiring recalibration in the field. | Use Scenario: Storing seat position presets, mirror angle memories, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Low-power EEPROM accessed via LIN-to-I²C bridge MCU; retains user preferences across ignition cycles. Use Value: Delivers personalized comfort features while meeting automotive AEC-Q200 reliability requirements. |
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 32K-bit capacity, identical MLP2x3 package, but specified for extended −40°C to +125°C operation and RoHS-compliant matte tin finish | Required for under-hood automotive or high-temperature industrial enclosures where 85°C ambient is exceeded | Select AT24C32D-SSHM-T only when extended temperature qualification or matte tin plating is mandated by design spec. |
| M24C32-WMN6TP | 32K-bit I²C EEPROM in 8-lead TSSOP (8A2), 1.8–5.5 V, 400 kHz max, but lacks 1 MHz fast-mode support and has higher standby current (5 µA @ 1.8 V) | Suitable for cost-sensitive consumer electronics where PCB area is less constrained and speed is secondary | Choose M24C32-WMN6TP only when TSSOP packaging is preferred and 1 MHz timing is unnecessary. |
Compared with AT24C32D-SSHM-T, AT24C32CN-SH-B offers lower cost and standard industrial temperature grade, while M24C32-WMN6TP trades speed and power efficiency for broader distributor availability in TSSOP - making AT24C32CN-SH-B optimal for compact, high-speed, cost-balanced industrial designs.
Availability
AT24C32CN-SH-B is available at Aetrix Electronics and suitable for smart metering, industrial PLC configuration, and medical sensor calibration requiring stable component supply and long-term obsolescence management.
Supply support for AT24C32CN-SH-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with leadership in secure, low-power, and industrial-grade ICs.
The AT24C32 series belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-voltage, I²C-based nonvolatile data storage in space- and power-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24C32CN-SH-B?
The AT24C32CN-SH-B supports up to 1 MHz at VCC = 5.0 V and 400 kHz at VCC = 1.8 V. These values are guaranteed across the full industrial temperature range (−40°C to +85°C) and reflect actual AC timing limits-not theoretical bus capability. Exceeding these frequencies may cause ACK failures or data corruption, especially under capacitive bus loading conditions.
Does the AT24C32CN-SH-B require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C32CN-SH-B requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. Recommended values are 1.3 kΩ for 2.5 V/5.0 V operation and 10 kΩ for 1.8 V operation, per the datasheet's AC measurement conditions. Omitting pull-ups will prevent proper I²C communication.
How does the Write Protect (WP) pin function on the AT24C32CN-SH-B?
When the WP pin is driven high to VCC, all write operations-including byte write, page write, and write cycle initiation-are disabled. When WP is grounded or left floating (with board coupling <3 pF), writes are enabled. This hardware-level protection operates independently of I²C commands and remains active during power transitions.
Can multiple AT24C32CN-SH-B devices share the same I²C bus?
Yes, up to eight AT24C32CN-SH-B devices can operate on a single I²C bus using the A0, A1, and A2 address pins to configure unique 7-bit slave addresses. Each pin set to high or low determines one bit of the address; floating pins default to logic low via internal biasing, enabling flexible hardware addressing without additional components.
What is the endurance rating and data retention specification for the AT24C32CN-SH-B?
The AT24C32CN-SH-B is rated for 1,000,000 write cycles per memory location and guarantees 100 years of data retention at +25°C. These specifications are characterized and validated per JEDEC standards, and apply across the full 1.8–5.5 V supply range and −40°C to +85°C operating temperature.
AT24C32CN-SH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-B FAQ
1.How can I place an order for AT24C32CN-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32CN-SH-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 AT24C32CN-SH-B reliable?
The price and inventory of AT24C32CN-SH-B 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-B is usually 5 days.
3.What payment methods are accepted for AT24C32CN-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32CN-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32CN-SH-B?
AT24C32CN-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32CN-SH-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 AT24C32CN-SH-B?
For technical support, including AT24C32CN-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32CN-SH-B requirements.
6.How does Aetrix verify that AT24C32CN-SH-B is sourced from the original manufacturer or authorized distributors?
All AT24C32CN-SH-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 AT24C32CN-SH-B meets industry standards.
7.What is the process for return or replacement of AT24C32CN-SH-B?
All AT24C32CN-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32CN-SH-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 AT24C32CN-SH-B part is unused and in its original packaging.
Return procedure for AT24C32CN-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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