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Microchip Technology 24AA32A-I/ST
- Part No.:
- 24AA32A-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA32A-I/ST.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,544
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Product details
Overview
24AA32A-I/ST from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protection via the WP pin. It supports page writes of up to 32 bytes and delivers 1 µA standby current for ultra-low-power embedded systems including sensor nodes and battery-backed configuration storage.
For engineers reviewing the 24AA32A-I/ST datasheet, 24AA32A-I/ST pinout, 24AA32A-I/ST application, or 24AA32A-I/ST equivalent, key selection criteria include its 1.7V minimum VCC, Schmitt-triggered SDA/SCL inputs for noise immunity, self-timed 5 ms write cycle, 1 million endurance cycles, and compatibility with multi-device I²C buses using A0–A2 address pins.
Technical Context
The 24AA32A-I/ST implements a two-wire I²C interface with open-drain SDA/SCL requiring external pull-ups, and uses internal address pointer logic to support current-address, random, and sequential read modes. Its page-write buffer enables burst writes within a 32-byte boundary without crossing physical page limits.
Write protection is controlled solely by the WP pin state at the Stop bit of each command; no software lock is required. Acknowledge polling is supported to detect write-cycle completion, and the device suspends ACK generation during internal erase/write operations - a critical timing behavior for bus arbitration in multi-master systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware parameters, calibration data, or device IDs in space-constrained designs |
| VCC range | 1.7V to 5.5V - supports direct interfacing 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 ≤ VCC < 2.5V - ensures reliable operation across low-voltage battery-powered use cases |
| Page write buffer | 32-byte - reduces I²C transaction overhead by up to 32× versus byte-write mode for bulk configuration updates |
| Endurance | 1,000,000 erase/write cycles - suitable for high-frequency logging or dynamic parameter storage in industrial controllers |
| Data retention | > 200 years at +25°C - guarantees long-term integrity of factory-programmed identifiers or security keys |
| ESD protection | > 4,000V HBM - provides robust handling margin during board assembly and field service |
Pinout & Package
24AA32A-I/ST is packaged in an 8-lead MSOP (3×3 mm body), with gull-wing leads and exposed pad optionally connected to VSS. Pin 1 is marked by a beveled corner or dot; lead pitch is 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | LSB of 3-bit device address; hardwired to VSS or VCC to select one of eight possible addresses on shared I²C bus |
| A1 | Chip address input | Middle bit of device address; determines unique client address when multiple 24AA32A-I/ST devices share SDA/SCL lines |
| A2 | Chip address input | MSB of device address; enables up to 256 Kbit contiguous memory expansion using A2–A0 as address bits A14–A12 |
| VSS | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane |
| SDA | Serial data I/O | Open-drain bidirectional line - requires external pull-up resistor (2 kΩ for 400 kHz, 10 kΩ for 100 kHz) and supports multi-master arbitration |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input ensures noise immunity on long traces |
| WP | Hardware write-protect | Active-high pin sampled at Stop bit - tied to VCC to block all writes while permitting unlimited reads; no software intervention needed |
| VCC | Power supply | Single supply input supporting 1.7V–5.5V operation; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.7V - enables direct integration into energy-harvesting and coin-cell-powered systems without voltage boosters |
| Page write capability | 32-byte buffer with automatic address increment - reduces I²C bus occupancy time by >90% vs. sequential byte writes for configuration blocks |
| Noise-immune interface | Schmitt-trigger inputs on SDA/SCL plus 50 ns input filter - eliminates false triggering from EMI in motor drives or power supplies |
| Write-cycle management | Self-timed 5 ms maximum erase/write - removes need for fixed delay timers in host firmware; ACK polling confirms completion |
| Hardware security | WP pin disables writes independently of software state - prevents accidental or malicious overwrites during firmware updates or debug sessions |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
|
Use Scenario: Storing temperature-compensation coefficients and sensor offset values in a wireless environmental monitor operating on AA batteries. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with infrequent writes and frequent reads; retains data during power loss between periodic transmissions. Use Value: 1 µA standby current extends battery life beyond 5 years; 1.7V operation allows use until battery drops to 1.8V nominal. |
Use Scenario: Holding factory-calibrated gain/offset parameters for analog front-end circuits in portable ECG monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage of medical-grade calibration data; accessed only during device boot or recalibration. Use Value: Hardware WP pin prevents runtime corruption; >200-year data retention meets ISO 13485 long-term record requirements. |
| Smart Meter Firmware Settings | Automotive Body Control Module |
|
Use Scenario: Saving tariff schedules, pulse constants, and communication settings in utility meters deployed in remote locations. IC Role / Device Role / Timing Role: Field-updatable configuration store accessed via isolated RS-485 interface; survives 10+ years of outdoor thermal cycling. Use Value: Industrial temperature rating (–40°C to +85°C) and AEC-Q100 qualification ensure reliability in uncontrolled environments. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in automotive door modules. IC Role / Device Role / Timing Role: I²C slave device interfaced to 3.3V MCU; writes occur only during user setup, reads during power-on initialization. Use Value: 400 kHz I²C speed enables fast profile loading; 1M endurance exceeds lifetime vehicle usage cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32A-I/ST | Requires minimum 2.5V VCC; same pinout, timing, and memory map - not usable below 2.5V | Not suitable for 1.8V systems or deep-battery-discharge scenarios where 24AA32A-I/ST remains functional | Select 24AA32A-I/ST when operating below 2.5V or needing guaranteed 1.7V functionality; choose 24LC32A-I/ST only if VCC ≥ 2.5V is assured. |
| AT24C32D-SSHM-T | Same 32-Kbit capacity and I²C interface but rated for 1.7V–5.5V; lacks AEC-Q100 qualification and has 500k endurance | Acceptable for commercial-grade consumer electronics but not certified for automotive or industrial safety-critical functions | Use AT24C32D-SSHM-T for cost-sensitive non-automotive designs; retain 24AA32A-I/ST where AEC-Q100 compliance or 1M-cycle endurance is mandatory. |
Compared with 24LC32A-I/ST and AT24C32D-SSHM-T, the 24AA32A-I/ST uniquely combines 1.7V operation, AEC-Q100 qualification, and 1-million-cycle endurance - making it the only choice for automotive body electronics and battery-powered industrial sensors requiring extended voltage margin and long-term reliability.
Availability
24AA32A-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, smart meter firmware settings, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for 24AA32A-I/ST 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 belongs to Microchip's serial EEPROM product line, engineered for ultra-low-power, high-reliability nonvolatile storage in automotive, industrial, and medical applications where voltage flexibility and long-term data integrity are critical.
FAQ
What is the minimum supply voltage for reliable operation of the 24AA32A-I/ST?
The 24AA32A-I/ST operates reliably down to 1.7V across its full industrial temperature range (–40°C to +85°C). Below 2.5V, the maximum I²C clock frequency is reduced to 100 kHz to maintain timing margins. This 1.7V minimum enables direct use with single-cell lithium or alkaline batteries without regulation, unlike the 24LC32A-I/ST which requires ≥2.5V.
How does the WP pin function on the 24AA32A-I/ST?
The WP (Write-Protect) pin on the 24AA32A-I/ST is sampled at the Stop bit of every write command. When tied to VCC, it inhibits all write operations (byte and page) while allowing unlimited reads. No software configuration is needed - protection is purely hardware-based and active immediately upon power-up if WP is held high.
Can the 24AA32A-I/ST be used in multi-device I²C configurations?
Yes. The 24AA32A-I/ST supports up to eight devices on a single I²C bus using the A0, A1, and A2 address pins to form a 3-bit chip address. Each device must have a unique combination of these inputs tied to VSS or VCC. The SOT-23 variant lacks these pins and supports only single-device configurations.
What is the maximum page write size for the 24AA32A-I/ST?
The 24AA32A-I/ST features a 32-byte page write buffer. Writes must remain within a single 32-byte physical page boundary (e.g., addresses 0x000–0x01F); crossing boundaries causes wraparound within the current page. This constraint requires firmware to align page writes and avoid unintended overwrites during bulk updates.
Is the 24AA32A-I/ST qualified for automotive applications?
Yes. The 24AA32A-I/ST is AEC-Q100 qualified for automotive applications, meeting stress test requirements for temperature cycling, humidity, and mechanical shock. Its industrial temperature range (–40°C to +85°C), 1.7V operation, and hardware write protection make it suitable for body control modules, infotainment memory backup, and ADAS subsystems.
24AA32A-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24AA32A-I/ST FAQ
1.How can I place an order for 24AA32A-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA32A-I/ST 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-I/ST reliable?
The price and inventory of 24AA32A-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA32A-I/ST is usually 5 days.
3.What payment methods are accepted for 24AA32A-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA32A-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA32A-I/ST?
24AA32A-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA32A-I/ST 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-I/ST?
For technical support, including 24AA32A-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA32A-I/ST requirements.
6.How does Aetrix verify that 24AA32A-I/ST is sourced from the original manufacturer or authorized distributors?
All 24AA32A-I/ST 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-I/ST meets industry standards.
7.What is the process for return or replacement of 24AA32A-I/ST?
All 24AA32A-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24AA32A-I/ST, 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-I/ST part is unused and in its original packaging.
Return procedure for 24AA32A-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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