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Microchip Technology 24AA32AT-E/ST16KVAO
- Part No.:
- 24AA32AT-E/ST16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA32AT-E/ST16KVAO.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
24AA32AT-E/ST16KVAO from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit, operating from 1.7V to 5.5V with 1 µA standby current, 400 kHz max clock (100 kHz below 2.5V), and hardware write-protection via the WP pin. It supports page writes of up to 32 bytes and is qualified for extended temperature operation (-40°C to +125°C).
For engineers reviewing the 24AA32AT-E/ST16KVAO datasheet, 24AA32AT-E/ST16KVAO pinout, 24AA32AT-E/ST16KVAO application, or 24AA32AT-E/ST16KVAO equivalent, this device serves as a low-voltage, high-endurance nonvolatile memory for configuration storage, calibration data retention, and firmware parameter logging in automotive and industrial control systems.
Technical Context
The 24AA32AT-E/ST16KVAO implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while the 32-byte page buffer allows efficient multi-byte writes without host intervention between bytes.
Write protection is enforced by sampling the WP pin at the Stop bit of each write command; tying WP to VCC disables all writes while preserving read functionality. The device uses an on-chip charge pump for EEPROM programming and features self-timed erase/write cycles with no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), enabling storage of 4 KB of persistent configuration or calibration data |
| VCC range | 1.7V–5.5V - supports direct interfacing with 1.8V, 2.5V, 3.3V, and 5V logic domains without level shifters |
| Max clock frequency | 400 kHz at VCC ≥ 2.5V; 100 kHz at 1.7V ≤ VCC < 2.5V - ensures reliable timing across full voltage range |
| Page write capacity | 32-byte buffer - reduces I²C transaction overhead and improves write throughput vs. byte-write-only devices |
| Endurance | 1,000,000 erase/write cycles per page - suitable for frequent parameter updates in field-deployed equipment |
| Data retention | >200 years at +25°C - guarantees long-term integrity of stored settings without refresh |
| ESD protection | >4,000V HBM - enhances robustness in handling-sensitive industrial assembly environments |
Pinout & Package
24AA32AT-E/ST16KVAO is packaged in an 8-lead ST (Small Outline Integrated Circuit, 150-mil body width) package with gull-wing leads and standard SOIC footprint. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and lead-free.
| 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 or VCC |
| A1 | Chip address input | Middle bit of 3-bit hardware address; enables up to eight devices on same I²C bus |
| A2 | Chip address input | MSB of 3-bit hardware address; determines unique 7-bit I²C address within shared bus topology |
| VSS | Ground reference | Return path for all internal circuits; must be connected to system ground plane for stable operation |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; carries addresses, commands, and data during I²C transactions |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; rising edge samples SDA, falling edge drives SDA |
| WP | Write-protect control | Active-high enable: tied to VCC blocks all writes but permits unlimited reads; sampled only at Stop condition |
| VCC | Power supply | Single supply input (1.7–5.5V); powers internal logic, EEPROM array, and charge pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation down to 1.7V | Enables direct integration into battery-powered or energy-harvesting systems without voltage boosting |
| Hardware write-protection (WP pin) | Prevents accidental or malicious firmware corruption during power transitions or software faults |
| Schmitt-trigger inputs on SDA/SCL | Rejects fast transients and EMI-induced noise, eliminating need for external RC filtering on I²C lines |
| Self-timed write cycle (≤5 ms) | Removes requirement for host to manage write timing; simplifies firmware and improves system predictability |
| 1 µA typical standby current | Minimizes quiescent power draw in always-on systems such as automotive ECUs or smart sensors |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles across ignition cycles in a vehicle's BCM. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime; retains data through cold starts and battery disconnects. Use Value: Enables personalized user settings without external backup power or supercapacitors due to >200-year data retention and 1.7V operation. |
Use Scenario: Holding I/O mapping tables, PID tuning parameters, and calibration coefficients in modular PLC backplanes. IC Role / Device Role / Timing Role: I²C slave memory storing field-configurable operational parameters; updated infrequently but read continuously during scan cycles. Use Value: Supports 1M+ write cycles and -40°C to +125°C operation, ensuring reliability in harsh factory environments with thermal cycling. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Archiving flow-rate calibration offsets, sensor drift compensation values, and usage logs in Class II medical devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory holding safety-critical calibration data; WP pin permanently tied to VCC after commissioning. Use Value: Hardware write-protection prevents unauthorized modification, satisfying IEC 62304 traceability and data integrity requirements. |
Use Scenario: Storing tariff schedules, metering constants, and communication keys in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Low-power I²C EEPROM retaining utility-defined parameters across decades of field deployment and firmware upgrades. Use Value: 1.7V minimum VCC and 1 µA standby current allow operation during brownout conditions and extend battery life in AMI endpoint units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32AT-E/ST | Requires minimum 2.5V VCC; identical pinout, timing, and memory architecture | Not suitable for 1.8V systems; otherwise drop-in replacement in 2.5–5.5V designs | Select when operating exclusively above 2.5V and cost sensitivity outweighs low-voltage flexibility |
| AT24C32D-SSHM-T | Same 32-Kbit capacity and I²C interface; supports 1.7–5.5V, but rated only to +85°C (industrial temp) | Lacks extended temperature qualification; unsuitable for under-hood automotive or high-ambient industrial use | Choose for cost-sensitive consumer or commercial applications where -40°C to +125°C is not required |
Compared with 24LC32AT-E/ST and AT24C32D-SSHM-T, the 24AA32AT-E/ST16KVAO uniquely combines 1.7V operation with AEC-Q100 extended temperature qualification, making it the only option among the three validated for automotive-grade deployment in low-voltage, thermally demanding environments.
Availability
24AA32AT-E/ST16KVAO is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, medical infusion pumps, and smart energy metering systems requiring stable component supply and long-term lifecycle support.
Supply support for 24AA32AT-E/ST16KVAO 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 devices, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and software platforms.
The 24AA32A family delivers ultra-low-voltage, high-reliability serial EEPROMs designed specifically for mission-critical configuration and calibration storage in automotive and extended-temperature industrial applications.
FAQ
What is the maximum I²C clock frequency supported by the 24AA32AT-E/ST16KVAO?
The 24AA32AT-E/ST16KVAO supports up to 400 kHz when VCC is 2.5V or higher. At VCC between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to ensure reliable signal timing margins. This dual-speed capability is built into the device's internal timing logic and requires no external configuration.
How does the WP pin function on the 24AA32AT-E/ST16KVAO?
The WP (Write-Protect) pin on the 24AA32AT-E/ST16KVAO is sampled only at the Stop condition of each I²C write command. When tied to VCC, it inhibits all write operations-including byte and page writes-while permitting unlimited read access. Tying WP to VSS enables normal read/write functionality. No latching or register setting is required.
Can the 24AA32AT-E/ST16KVAO operate reliably at 1.8V supply voltage?
Yes, the 24AA32AT-E/ST16KVAO is fully specified to operate at 1.8V. Its 1.7V–5.5V VCC range includes 1.8V as a standard operating point, with guaranteed DC and AC characteristics including 1 µA standby current, 400 kHz clock compatibility (at ≥2.5V), and 100 kHz operation with full timing compliance at 1.8V.
What is the endurance rating of the 24AA32AT-E/ST16KVAO, and how is it measured?
The 24AA32AT-E/ST16KVAO is rated for 1,000,000 erase/write cycles per page. This endurance is characterized at +25°C and 5.5V using page-mode writes, where the entire 32-byte page is rewritten in a single operation. Endurance is specified per physical page-not per byte-to reflect actual wear leveling behavior in real-world usage.
Is the 24AA32AT-E/ST16KVAO qualified for automotive applications?
Yes, the 24AA32AT-E/ST16KVAO is AEC-Q100 qualified for extended temperature operation (-40°C to +125°C) and meets automotive reliability standards including HTOL, ESD, and mechanical stress testing. Its ST package variant is approved for under-hood and body-control module deployment per AEC-Q100 Grade 1 requirements.
24AA32AT-E/ST16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 100 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 3.5 µs
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24AA32AT-E/ST16KVAO FAQ
1.How can I place an order for 24AA32AT-E/ST16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA32AT-E/ST16KVAO 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 24AA32AT-E/ST16KVAO reliable?
The price and inventory of 24AA32AT-E/ST16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA32AT-E/ST16KVAO is usually 5 days.
3.What payment methods are accepted for 24AA32AT-E/ST16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA32AT-E/ST16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA32AT-E/ST16KVAO?
24AA32AT-E/ST16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA32AT-E/ST16KVAO 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 24AA32AT-E/ST16KVAO?
For technical support, including 24AA32AT-E/ST16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA32AT-E/ST16KVAO requirements.
6.How does Aetrix verify that 24AA32AT-E/ST16KVAO is sourced from the original manufacturer or authorized distributors?
All 24AA32AT-E/ST16KVAO 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 24AA32AT-E/ST16KVAO meets industry standards.
7.What is the process for return or replacement of 24AA32AT-E/ST16KVAO?
All 24AA32AT-E/ST16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 24AA32AT-E/ST16KVAO, 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 24AA32AT-E/ST16KVAO part is unused and in its original packaging.
Return procedure for 24AA32AT-E/ST16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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