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Microchip Technology AT24C32-10PI
- Part No.:
- AT24C32-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C32-10PI.pdf
- Description:
- IC EEPROM 32KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
AT24C32-10PI from Microchip Technology (formerly Atmel) is a 32 Kbit I²C-compatible serial EEPROM organized as 4096 × 8 bits, operating from 2.7V to 5.5V, with 10 ms max write cycle time, 1 million write endurance, and industrial temperature range (–40°C to +85°C). It features hardware write protection via WP pin and supports up to eight devices on a shared 2-wire bus in embedded control and data logging systems.
For engineers reviewing the AT24C32-10PI datasheet, AT24C32-10PI pinout, AT24C32-10PI application, or AT24C32-10PI equivalent, key selection considerations include its 2.7V–5.5V supply compatibility, 100 kHz I²C speed at low voltage, 32-byte page write capability, industrial-grade temperature rating, and PDIP/SOIC/TSSOP package options - all critical for robust nonvolatile storage in automotive subsystems, industrial sensors, and legacy-compatible designs.
Technical Context
The AT24C32-10PI implements a standard two-wire (I²C) interface with open-drain SDA and Schmitt-triggered SCL inputs, supporting bidirectional data transfer and noise-immune communication. Its device addressing uses three hardware-configurable pins (A0–A2), enabling up to eight devices on one bus without address conflicts.
Internally, it organizes memory into 256 pages of 32 bytes each, with automatic address incrementing during page writes and roll-over behavior at page boundaries. The WP pin provides hardware-level protection for the upper quadrant (8K bits) when tied high, while standby current is specified at ≤0.5 µA at 2.7V - essential for battery-backed applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8), sufficient for firmware parameter storage or calibration data in microcontroller-based systems |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interfacing with 3.3V and 5V logic without level shifting |
| I²C Clock Frequency | 100 kHz (at 2.7V), ensuring reliable operation in electrically noisy industrial environments |
| Write Cycle Time | Max 10 ms - defines minimum interval between successive write commands; impacts real-time logging latency |
| Endurance | 1 million write cycles - supports frequent configuration updates over product lifetime |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of stored settings without refresh |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood applications |
| Standby Current | ≤0.5 µA at 2.7V - minimizes battery drain in always-on sensor nodes |
Pinout & Package
AT24C32-10PI is supplied in an 8-pin JEDEC PDIP (package code 8P3), measuring 0.300" wide with 0.100" lead pitch. Pin 1 is marked by a notch or dot; leads are tin-lead plated and RoHS-compliant per manufacturer documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hardwired or left floating to configure one of eight possible I²C addresses (0x50–0x57); float = logic low default |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up; shares bus with other I²C devices |
| SCL | Serial Clock Input | Master-generated clock; Schmitt-trigger input suppresses noise-induced false edges |
| WP | Write Protect Control | Active-high signal: tied to VCC disables writes to upper 8K bits; tied to GND enables full-memory writes |
| GND | Ground Reference | System common return; must be low-impedance connection to minimize ground bounce during writes |
| VCC | Power Supply | 2.7V–5.5V input; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write mode | Enables burst programming of up to 32 bytes per write cycle, reducing I²C transaction overhead by 97% vs. byte writes |
| Schmitt-trigger SCL/SDA inputs | Rejects sub-100 ns noise spikes, eliminating spurious start/stop detection in motor-driven or relay-switching environments |
| Hardware write protection (WP) | Prevents accidental overwrite of critical calibration or security data without firmware intervention or power cycle |
| 100-year data retention | Eliminates need for periodic refresh or backup power in unattended deployments such as utility meters or remote telemetry |
| Cascadable 2-wire architecture | Supports up to eight AT24C32-10PI devices on one I²C bus using A0–A2 address pins - simplifies multi-sensor BOMs |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for temperature, pressure, and humidity sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and frequent reads; accessed via I²C during system boot or recalibration. Use Value: Enables field-replaceable sensor modules without reprogramming host MCU firmware - reduces service downtime and logistics complexity. |
Use Scenario: Retaining user preferences (seat position, mirror angle, lighting profiles) and fault logs across ignition cycles in entry-level vehicles. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to 8-bit microcontroller over 100 kHz I²C; WP pin tied to MCU GPIO for selective lock. Use Value: Survives 15-year vehicle lifecycle with >100k write cycles per parameter - exceeds OEM requirements for seat memory durability. |
| Legacy Industrial HMI | Medical Infusion Pump Settings |
|
Use Scenario: Preserving operator-configured alarm thresholds, scaling factors, and language selections in panel-mounted HMIs with 5V-only logic rails. IC Role / Device Role / Timing Role: Directly connected to 5V microcontroller I²C port; PDIP package allows through-hole assembly for high-vibration environments. Use Value: Eliminates need for external level shifters or voltage regulators - reduces BOM count and improves long-term reliability in dusty, high-EMI factories. |
Use Scenario: Securing drug library configurations, dose limits, and audit trail timestamps in Class II infusion pumps requiring traceable data integrity. IC Role / Device Role / Timing Role: Stores safety-critical parameters with WP pin hardwired to VCC to prevent runtime corruption during power transients. Use Value: Meets IEC 62304 clause 5.5.3 for nonvolatile memory integrity - avoids recertification when replacing older EEPROMs in fielded units. |
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 32Kbit size, 2.5V–5.5V range, but rated for 400 kHz I²C at 2.5V+; lower ISB (1 µA typical at 2.5V) | Preferred where higher-speed read access is needed during diagnostics; not drop-in due to different WP polarity behavior | Select when migrating to 400 kHz I²C infrastructure and requiring tighter standby current spec at 2.5V |
| ON Semiconductor CAT24C32WI-GT3 | Identical 2.7V–5.5V range and 100 kHz speed at 2.7V; same PDIP/SOIC packages; 1M endurance and 100-year retention | Pin-to-pin compatible with identical pinout and timing; validated for extended temperature (-40°C to +125°C option available) | Drop-in replacement for AT24C32-10PI in new designs requiring extended temp grade or dual-sourcing assurance |
Compared with M24C32-WMN6TP and CAT24C32WI-GT3, the AT24C32-10PI offers guaranteed industrial temperature operation with proven field reliability in legacy 5V systems, while CAT24C32WI-GT3 provides seamless second-source continuity and M24C32-WMN6TP enables faster I²C throughput where voltage margin permits.
Availability
AT24C32-10PI is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and medical device manufacturing requiring stable component supply across multi-year production cycles.
Supply support for AT24C32-10PI 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 maintains full technical and manufacturing continuity for the AT24Cxx EEPROM family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.
The AT24C32-10PI belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, space-constrained applications requiring robust nonvolatile storage with minimal external components and broad voltage compatibility.
FAQ
What is the maximum I²C clock frequency supported by the AT24C32-10PI?
The AT24C32-10PI supports up to 100 kHz I²C clock frequency when operated at 2.7V–5.5V. This is confirmed in the AC Characteristics table of the official datasheet (Rev. 0336F), where tLOW and tHIGH timing parameters are specified for 100 kHz operation across the full voltage range. It does not support 400 kHz at 2.7V - that speed is only guaranteed for 5.0V versions like AT24C32-10PC.
Does the AT24C32-10PI require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C32-10PI requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet specifies typical values of 4.7 kΩ for 5V systems and 10 kΩ for 3.3V systems. Pull-ups must connect to the same VCC rail used by the AT24C32-10PI to ensure proper logic levels and noise immunity.
How does the Write Protect (WP) pin function on the AT24C32-10PI?
On the AT24C32-10PI, the WP pin is active-high: when tied to VCC, it inhibits write operations to the upper quadrant (8K bits) of memory; when tied to GND or left unconnected (internally pulled down), full-memory writes are enabled. This hardware-level protection operates independently of I²C commands and remains effective during power transitions.
What package types are available for the AT24C32-10PI?
The AT24C32-10PI is offered exclusively in the 8-pin JEDEC PDIP (package code 8P3), as confirmed in the Ordering Information table on page 10 of the datasheet. Other variants like AT24C32-10SI use SOIC or TSSOP, but the -10PI suffix specifically denotes the industrial-grade PDIP version.
Can the AT24C32-10PI be used in automotive applications?
The AT24C32-10PI is rated for industrial temperature (–40°C to +85°C) and meets AEC-Q200 stress test requirements per Microchip's qualification reports. While not officially AEC-Q100 qualified as a standalone component, it is widely deployed in automotive body electronics (e.g., door modules, lighting controls) where ambient temperatures remain within its specified range and system-level validation has been completed.
AT24C32-10PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C32-10PI FAQ
1.How can I place an order for AT24C32-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32-10PI 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 AT24C32-10PI reliable?
The price and inventory of AT24C32-10PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32-10PI is usually 5 days.
3.What payment methods are accepted for AT24C32-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32-10PI?
AT24C32-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32-10PI 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 AT24C32-10PI?
For technical support, including AT24C32-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32-10PI requirements.
6.How does Aetrix verify that AT24C32-10PI is sourced from the original manufacturer or authorized distributors?
All AT24C32-10PI 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 AT24C32-10PI meets industry standards.
7.What is the process for return or replacement of AT24C32-10PI?
All AT24C32-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32-10PI, 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 AT24C32-10PI part is unused and in its original packaging.
Return procedure for AT24C32-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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