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Microchip Technology 24AA32A/SM
- Part No.:
- 24AA32A/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24AA32A/SM.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
24AA32A/SM from Microchip Technology is a 32-Kbit I²C serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with 1 µA standby current and 400 kHz max clock frequency. It features hardware write-protection (WP), Schmitt-trigger inputs for noise immunity, and 32-byte page write buffer-used in embedded system configuration storage, sensor calibration data retention, and industrial controller parameter backup.
For engineers reviewing the 24AA32A/SM datasheet, 24AA32A/SM pinout, 24AA32A/SM application, or 24AA32A/SM equivalent, this page delivers verified electrical specs, package-confirmed pin functions, real-world use cases, and two validated alternative parts for design flexibility across low-voltage industrial and automotive systems.
Technical Context
The 24AA32A/SM implements a two-wire I²C-compatible interface with fixed 1010 control code and three hardware address pins (A0–A2), enabling up to eight devices on one bus. Its internal architecture includes a 32-byte page latch, EEPROM array with HV generator, and dedicated memory control logic for self-timed erase/write cycles.
It supports byte and page write modes, current/random/sequential read operations, and acknowledge polling for write-cycle completion detection. The device uses open-drain SDA/SCL with built-in slope control and hysteresis (≥0.05 VCC) to suppress ground bounce and EMI-induced glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), sufficient for firmware flags, calibration coefficients, or device ID storage in space-constrained designs |
| VCC range | 1.7V–5.5V - enables direct integration with 1.8V, 3.3V, and 5V microcontrollers without level-shifting |
| Max clock frequency | 400 kHz at VCC ≥2.5V; 100 kHz at 1.7V–2.49V - ensures reliable timing across wide supply range |
| Page write buffer | 32 bytes - reduces I²C transaction count by up to 32× vs. byte writes, improving bus efficiency |
| Write endurance | 1,000,000 cycles - supports frequent logging or dynamic parameter updates in industrial controllers |
| Data retention | >200 years at +25°C - guarantees long-term integrity of stored configuration or calibration data |
| ESD protection | >4,000V HBM - enhances robustness in handling-sensitive manufacturing and field service environments |
Pinout & Package
24AA32A/SM is packaged in an 8-lead MSOP (3×3 mm body, 0.65 mm pitch), with exposed pad optional for thermal relief or grounding. Pin numbering follows standard MSOP top-view orientation (Pin 1 = A0, Pin 8 = VCC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | LSB of 3-bit hardware address; sets device I²C client address (1010A2A1A0) when hardwired to VSS/VCC |
| A1 | Chip address input | Middle bit of 3-bit hardware address; enables up to eight 24AA32A/SM devices on same I²C bus |
| A2 | Chip address input | MSB of 3-bit hardware address; required for multi-device addressing and contiguous 256-Kbit expansion |
| VSS | Ground reference | Return path for all internal circuitry; must be connected to system GND with low-impedance trace |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ @ 400 kHz); carries addresses, commands, and data |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input rejects noise on rising/falling edges |
| WP | Write-protect control | Active-high enable: tied to VCC blocks all writes (read-only mode); tied to VSS enables full R/W access |
| VCC | Power supply | Single 1.7–5.5V supply powering EEPROM core, interface logic, and internal charge pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.7V - eliminates need for voltage regulators in battery-powered or energy-harvesting systems |
| Hardware write-protection | Dedicated WP pin with VCC/VSS logic-level control - prevents accidental overwrites during power transients or firmware faults |
| Noise-immune interface | Schmitt-trigger inputs + output slope control - suppresses ground bounce and EMI without external RC filters |
| Page write capability | 32-byte buffer with automatic address increment - reduces I²C overhead and accelerates bulk data programming |
| Extended temperature support | Industrial grade (-40°C to +85°C) - qualified for deployment in motor drives, HVAC controls, and outdoor electronics |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain values and runtime compensation coefficients for MEMS pressure sensors in wireless condition-monitoring nodes. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with I²C interface; retains data across cold starts and brownouts. Use Value: Enables plug-and-play sensor replacement without reprogramming host MCU; 1.7V operation extends battery life in low-power sleep modes. |
Use Scenario: Holding seat position memory, mirror angle presets, and lighting configuration profiles in vehicle door modules. IC Role / Device Role / Timing Role: Persistent parameter storage interfaced to 3.3V microcontroller via I²C; accessed during power-up and user adjustment events. Use Value: Supports AEC-Q100 qualification requirements; WP pin prevents corruption during ignition transients or CAN bus noise bursts. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Recording dose history, alarm logs, and calibration timestamps in Class II medical devices requiring traceable audit trails. IC Role / Device Role / Timing Role: Tamper-resistant data logger with write endurance >1M cycles; stores time-stamped events using internal address pointer. Use Value: Meets IEC 62304 software lifecycle requirements; >200-year data retention satisfies regulatory record-keeping mandates. |
Use Scenario: Saving tariff schedules, meter firmware version, and tamper-detection flags in utility-grade electricity meters deployed in harsh outdoor enclosures. IC Role / Device Role / Timing Role: Secure configuration vault with hardware write-protection; accessed only during firmware update or utility commissioning. Use Value: RoHS-compliant MSOP package withstands extended thermal cycling; 4kV ESD rating protects against field-service ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32A/SM | Requires minimum 2.5V VCC; identical pinout, timing, and memory organization | Not suitable for sub-2.5V systems; otherwise drop-in compatible in 3.3V/5V industrial designs | Select when higher VCC stability is guaranteed and 24AA32A/SM's 1.7V capability is unnecessary |
| AT24C32D-MAHM-T | Same 32-Kbit I²C EEPROM but with 1.7–5.5V range and 1 MHz max clock; different MSOP marking and JEDEC code | Offers faster write cycle (3 ms typ.) and enhanced ESD (6 kV); requires validation of SDA/SCL rise-time compliance | Prefer for new designs needing higher throughput or stronger ESD margin, with attention to layout-dependent AC timing |
Compared with 24LC32A/SM and AT24C32D-MAHM-T, the 24AA32A/SM uniquely supports 1.7V operation while maintaining identical MSOP footprint and I²C protocol compatibility-making it optimal for ultra-low-power legacy or cost-sensitive designs where voltage headroom is constrained.
Availability
24AA32A/SM is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24AA32A/SM 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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24AA32A/SM belongs to Microchip's serial EEPROM product line, engineered for reliable nonvolatile data storage in resource-constrained embedded systems where low voltage, low power, and I²C simplicity are critical.
FAQ
What is the minimum operating voltage for the 24AA32A/SM?
The 24AA32A/SM operates down to 1.7V, enabling direct connection to 1.8V logic families and extending battery life in portable equipment. This specification is confirmed in the Device Selection Table and Electrical Characteristics section of the DS20001713P datasheet, distinguishing it from the 24LC32A/SM which requires ≥2.5V.
Does the 24AA32A/SM support page write operations, and what is the buffer size?
Yes, the 24AA32A/SM supports page write operations with a 32-byte buffer, allowing up to 32 bytes to be written in a single I²C transaction. This is explicitly stated in the Features list and detailed in Section 6.2 of the datasheet, reducing bus overhead versus byte-by-byte writes.
How does the Write-Protect (WP) pin function on the 24AA32A/SM?
The WP pin on the 24AA32A/SM disables all write operations when pulled high to VCC, while permitting unrestricted reads. When tied to VSS, full read/write access is enabled. This behavior is defined in Section 2.4 and Figure 6-1, and the pin is sampled at the Stop bit of each write command.
Is the 24AA32A/SM qualified for automotive applications?
No-the 24AA32A/SM is rated for Industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While the 24LC32A variant is automotive-qualified, the 24AA32A/SM is intended for industrial, medical, and consumer applications where extended temperature or automotive reliability certification is not required.
What package type does the 24AA32A/SM use, and are pin dimensions documented?
The 24AA32A/SM uses an 8-lead MSOP package (3×3 mm body, 0.65 mm pitch), with mechanical drawings and land pattern specifications provided in DS20001713P pages 18–20. Pin 1 is marked by a notch or dot, and the exposed pad is optional for thermal or grounding purposes per Microchip Drawing C04-111-MS Rev F.
24AA32A/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
24AA32A/SM FAQ
1.How can I place an order for 24AA32A/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA32A/SM 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 24AA32A/SM reliable?
The price and inventory of 24AA32A/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA32A/SM is usually 5 days.
3.What payment methods are accepted for 24AA32A/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA32A/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA32A/SM?
24AA32A/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA32A/SM 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 24AA32A/SM?
For technical support, including 24AA32A/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA32A/SM requirements.
6.How does Aetrix verify that 24AA32A/SM is sourced from the original manufacturer or authorized distributors?
All 24AA32A/SM 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 24AA32A/SM meets industry standards.
7.What is the process for return or replacement of 24AA32A/SM?
All 24AA32A/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24AA32A/SM, 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 24AA32A/SM part is unused and in its original packaging.
Return procedure for 24AA32A/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24AA32A/SM Tags
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