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Microchip Technology AT24C32A-10PU-1.8
- Part No.:
- AT24C32A-10PU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C32A-10PU-1.8.pdf
- Description:
- IC EEPROM 32KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
AT24C32A-10PU-1.8 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) two-wire serial EEPROM with 1.8V to 5.5V supply operation, 400 kHz I²C interface, hardware write protection via WP pin, and 32-byte page write capability. It delivers 1 million write cycles and 100-year data retention for nonvolatile parameter storage in low-power embedded systems.
For engineers reviewing the AT24C32A-10PU-1.8 datasheet, AT24C32A-10PU-1.8 pinout, AT24C32A-10PU-1.8 application, or AT24C32A-10PU-1.8 equivalent, this device serves as a drop-in-capable, industrial-temperature (–40°C to +85°C), RoHS-compliant serial memory solution optimized for space-constrained designs requiring reliable, low-voltage configuration storage.
Technical Context
The AT24C32A-10PU-1.8 implements a standard I²C-compatible two-wire interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain outputs. Its internal address counter supports current-address, random-address, and sequential read modes, while the A0–A2 pins enable up to eight devices on a shared bus.
It features a 32-byte page buffer with self-timed 5 ms max write cycle, hardware write protection via the WP pin, and standby current as low as 1.0 µA at 1.8V. The device uses internal proprietary biasing for floating A0–A2 and WP pins, ensuring robust operation without external pull-ups in low-noise environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32,768 bits (4096 × 8 words) - sufficient for firmware calibration tables, device IDs, or user settings in compact microcontroller systems |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic families and compatibility with mixed-voltage systems |
| I²C Clock Frequency | Up to 400 kHz - supports high-speed configuration reads/writes without requiring custom timing firmware |
| Write Endurance | 1 million cycles - ensures long-term reliability in applications with frequent parameter updates (e.g., energy metering logs) |
| Data Retention | 100 years at +25°C - guarantees persistent storage across product lifetime without battery backup |
| Standby Current | 1.0 µA at 1.8V - minimizes quiescent power in always-on IoT sensors and portable devices |
| Page Write Size | 32 bytes - reduces transaction overhead versus byte-write mode and improves efficiency during bulk configuration writes |
Pinout & Package
AT24C32A-10PU-1.8 is supplied in an 8-lead PDIP (8P3) package, 0.300" wide, lead-free and RoHS-compliant, suitable for through-hole prototyping and legacy industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hardwired or left floating (internally pulled down); configure one of eight possible I²C addresses on shared bus |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up; supports wire-OR with other I²C devices |
| SCL | Serial Clock Input | Positive-edge clock input for data-in; negative-edge sampling for data-out; Schmitt-triggered for noise immunity |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; floating defaults to GND (write enabled) |
| GND | Ground Reference | System return path for VCC and signal references; must be low-impedance for stable I²C signaling |
| VCC | Power Supply | Single 1.8–5.5V supply; powers internal logic and EEPROM array; no separate VDD/VSS required |
Key Features
| Feature | Design Value |
|---|---|
| Low-Voltage Operation | Functional down to 1.8V supply - eliminates level-shifting need in ultra-low-power MCU subsystems |
| Hardware Write Protection | Dedicated WP pin with internal pull-down - prevents accidental overwrites during power transitions or firmware faults |
| Noise-Suppressed Interface | Schmitt-trigger inputs + 50 ns noise filtering - tolerates EMI in motor drives, industrial controls, and automotive body modules |
| Page Write Mode | 32-byte burst writes with automatic address increment - cuts I²C transaction count by >90% vs. byte-by-byte writes |
| Cascadable Architecture | Three address pins (A0–A2) support up to eight devices on one I²C bus - simplifies multi-sensor node design |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff schedules, calibration coefficients, and tamper-event logs in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Nonvolatile configuration and event storage IC interfaced directly to 1.8V metrology SoC via I²C. Use Value: 100-year data retention ensures compliance with utility regulatory requirements without battery backup or refresh routines. |
Use Scenario: Holding module identification, channel scaling factors, and diagnostic history in modular I/O backplanes. IC Role / Device Role / Timing Role: Serial parameter memory accessed during cold start and hot-swap detection sequences. Use Value: 1.8V operation allows direct connection to low-power FPGA configuration interfaces, reducing BOM count. |
| Medical Wearables | Automotive Body Controllers |
Use Scenario: Saving patient-specific therapy parameters and usage counters in Bluetooth-enabled insulin pumps and pulse oximeters. IC Role / Device Role / Timing Role: Low-quiescent EEPROM for secure, infrequently updated device state storage. Use Value: 1.0 µA standby current extends battery life in coin-cell-powered Class II medical devices beyond 12 months. |
Use Scenario: Storing seat position presets, mirror calibration offsets, and lighting profiles in door modules and junction boxes. IC Role / Device Role / Timing Role: I²C-configurable memory mapped into vehicle network boot sequence. Use Value: WP pin hardwired to ignition rail provides fail-safe write inhibition during cranking transients. |
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 and 1.7–5.5V range; SOIC-8 package; higher 1 MHz I²C speed rating | Targeted at newer designs requiring faster configuration loads; lacks PDIP option | Select when board layout supports SOIC-8 and system firmware supports 1 MHz I²C timing |
| M24C32-WMN6TP | 32K-bit, 1.8–5.5V, TSSOP-8; 400 kHz I²C; 1M endurance; same WP functionality | Smaller footprint (4.4 mm body); optimized for automated SMT assembly; identical functional behavior | Choose for space-constrained boards where surface-mount is mandatory and PDIP is not required |
Compared with AT24C32A-10PU-1.8, AT24C32D-SSHM-T offers higher-speed I²C but no through-hole option, while M24C32-WMN6TP provides identical electrical specs in a smaller TSSOP package-making both viable alternatives depending on mechanical and timing constraints.
Availability
AT24C32A-10PU-1.8 is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, and medical wearables requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for AT24C32A-10PU-1.8 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, delivering high-reliability nonvolatile memory solutions since 1980.
The AT24C32A series was designed specifically for industrial and commercial applications demanding low-voltage operation, robust noise immunity, and long-term data integrity in resource-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24C32A-10PU-1.8?
The AT24C32A-10PU-1.8 supports up to 400 kHz I²C clock frequency across its full 1.8V to 5.5V supply range. This is verified per Table 4 AC Characteristics in the official datasheet (3054T–SEEPR–1/07), with tLOW ≥1.2 µs and tHIGH ≥0.6 µs timing compliance confirmed at 1.8V, 2.5V, 2.7V, and 5.0V operation.
Does the AT24C32A-10PU-1.8 require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C32A-10PU-1.8 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. The datasheet specifies typical values of 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; absence of pull-ups will prevent proper I²C communication and ACK generation.
How does the WP pin function on the AT24C32A-10PU-1.8, and what happens if it's left unconnected?
When WP is tied to VCC, all write operations to the AT24C32A-10PU-1.8 memory are inhibited. If left floating, the pin is internally pulled down to GND (enabling writes) only if capacitive coupling to the VCC plane is <3 pF; otherwise, Atmel recommends explicit grounding to ensure predictable behavior.
What is the write cycle time for the AT24C32A-10PU-1.8, and how can firmware detect completion?
The AT24C32A-10PU-1.8 has a maximum write cycle time of 5 ms. Firmware can detect completion using acknowledge polling: after issuing a write command, repeatedly send a START + device address (R/W=0); the AT24C32A-10PU-1.8 responds with ACK only once the internal write completes.
Is the AT24C32A-10PU-1.8 qualified for automotive applications?
No-the AT24C32A-10PU-1.8 is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While the datasheet notes "Automotive Devices Available" for the broader family, this specific variant (10PU-1.8) carries no automotive qualification; use AT24C32A-10MU-1.8 or equivalent for automotive-grade requirements.
AT24C32A-10PU-1.8 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:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C32A-10PU-1.8 FAQ
1.How can I place an order for AT24C32A-10PU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32A-10PU-1.8 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 AT24C32A-10PU-1.8 reliable?
The price and inventory of AT24C32A-10PU-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32A-10PU-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C32A-10PU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32A-10PU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32A-10PU-1.8?
AT24C32A-10PU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32A-10PU-1.8 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 AT24C32A-10PU-1.8?
For technical support, including AT24C32A-10PU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32A-10PU-1.8 requirements.
6.How does Aetrix verify that AT24C32A-10PU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C32A-10PU-1.8 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 AT24C32A-10PU-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C32A-10PU-1.8?
All AT24C32A-10PU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32A-10PU-1.8, 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 AT24C32A-10PU-1.8 part is unused and in its original packaging.
Return procedure for AT24C32A-10PU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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