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Microchip Technology 25AA320AT-I/SN
- Part No.:
- 25AA320AT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25AA320AT-I/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,777
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Product details
Overview
25AA320AT-I/SN from Microchip Technology Inc. is a 32-Kbit SPI Serial EEPROM with 4096 × 8-bit organization, 32-byte page size, and industrial temperature range (−40°C to +85°C). It operates from 1.8V to 5.5V, supports up to 10 MHz clock frequency at 4.5–5.5V, and features hardware write protection via WP pin and STATUS register control. It is used in microcontroller-based systems for nonvolatile parameter storage, calibration data retention, and firmware configuration.
For engineers reviewing the 25AA320AT-I/SN datasheet, 25AA320AT-I/SN pinout, 25AA320AT-I/SN application, or 25AA320AT-I/SN equivalent, key selection criteria include SPI interface compatibility, 1.8V minimum VCC support, AEC-Q100 qualification for automotive use, and block-level write protection granularity (none/¼/½/all array).
Technical Context
The 25AA320AT-I/SN implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI (data in) and SO (data out) lines, CS-controlled device selection, and HOLD pin for transaction suspension without reset. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generator for EEPROM programming.
It uses self-timed internal write cycles (≤5 ms), supports sequential read with automatic address increment, and provides dual-layer write protection: software-controlled STATUS register bits (BP0/BP1) and hardware-enforced WP pin functionality when WPEN = 1. The device powers on with WEL reset and SO in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit), enabling storage of 4 KB of configuration or calibration data. |
| Interface | SPI-compatible serial bus (Mode 0,0 / Mode 1,1), requiring only CS, SCK, SI, SO, WP, HOLD - no I²C or parallel bus overhead. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V; enables fast read/write transfers (e.g., 32-byte page write in ~3.2 µs clock time before 5 ms internal cycle). |
| Write Endurance | >1 million erase/write cycles, supporting long-term field updates in programmable logic controllers or sensor nodes. |
| Data Retention | >200 years at +25°C, ensuring reliable storage of factory-trimmed coefficients or security keys over product lifetime. |
| VCC Range | 1.8V to 5.5V, allowing direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
| Temperature Range | Industrial (−40°C to +85°C), qualified per AEC-Q100 Grade 2, suitable for under-hood automotive modules and industrial HMIs. |
Pinout & Package
25AA320AT-I/SN is packaged in an 8-lead narrow SOIC (SN) with 1.27 mm pitch, 3.90 mm body width, and JEDEC MS-012AC compliant footprint. Pin 1 is marked by a beveled corner or dot; package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: pulls device out of standby; rising edge after valid write initiates internal 5 ms write cycle. |
| SO | Serial Data Output | Tri-state open-drain output; data shifted out on SCK falling edge; high-impedance when CS high or HOLD low. |
| WP | Write-Protect Input | Hardware lock: disables STATUS register writes when WP = low and WPEN = 1; does not affect memory reads or byte writes. |
| VSS | Ground Reference | Primary return path for all digital and internal HV programming currents; must be low-impedance. |
| SI | Serial Data Input | Latches instruction, address, and data on SCK rising edge; accepts 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE). |
| SCK | Serial Clock Input | Synchronizes all SPI transactions; max 10 MHz rate defines upper bound on command throughput. |
| HOLD | Hold Input | Suspends ongoing SPI sequence (e.g., mid-read) without losing state; requires SCK low before assertion. |
| VCC | Supply Voltage | Power input (1.8–5.5V); supplies internal charge pump for EEPROM writes; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write capability | Enables efficient bulk programming: up to 32 bytes written per CS-high transition, reducing host CPU overhead vs. byte-by-byte writes. |
| Block write protection (BP0/BP1) | Configurable via STATUS register to protect none, upper 1/4 (0xC00–0xFFF), upper 1/2 (0x800–0xFFF), or entire array - prevents accidental firmware corruption. |
| Power-on write disable | WEL latch resets at power-up, eliminating risk of spurious writes during supply ramp; explicit WREN command required before any write. |
| HOLD pin with zero-cycle resume | Pauses SPI communication mid-sequence and resumes from exact point on HOLD release - critical for real-time interrupt handling in MCU hosts. |
| ESD robustness | 4 kV HBM rating on all pins ensures reliability in manufacturing, assembly, and field environments with static-prone handling. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and fault log history in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during boot and runtime; retains data across 10⁵+ power cycles. Use Value: Eliminates need for battery-backed SRAM; supports remote firmware updates with verified write-protection to prevent corruption of safety-critical settings. |
Use Scenario: Holding door lock actuator calibration offsets, seat position presets, and lighting dimming profiles in automotive BCMs. IC Role / Device Role / Timing Role: AEC-Q100 qualified EEPROM providing secure, long-life storage for user-customizable vehicle settings. Use Value: Enables personalization features without increasing BOM cost; BP1/BP0 bits lock factory calibration data while permitting user-write access to preference zones. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Settings |
|
Use Scenario: Storing flow-rate calibration coefficients, dose limits, and maintenance counters in Class II medical infusion pumps requiring regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory storing FDA-mandated operational parameters with >200-year data retention. Use Value: Meets IEC 62304 software lifecycle requirements; WP pin hardens against unauthorized reprogramming during service mode. |
Use Scenario: Retaining tariff schedules, metering constants, and communication protocol keys in ANSI C12.22-compliant smart electricity meters deployed for 20+ years. IC Role / Device Role / Timing Role: High-endurance EEPROM storing cryptographic keys and utility-defined configuration blocks updated infrequently but requiring absolute integrity. Use Value: 1M write cycles support field firmware patches over decades; block protection isolates utility-write zones from end-user configurable fields. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC320AT-I/SN | Requires minimum 2.5V VCC; lacks 1.8V operation; otherwise identical pinout, timing, and feature set. | Not suitable for 1.8V-only systems (e.g., ultra-low-power IoT sensors), but acceptable in 3.3V/5V industrial controls. | Select 25LC320AT-I/SN only if system VCC never drops below 2.5V and 1.8V compatibility is unnecessary. |
| AT25DF321A-SHN-T | 32-Mbit density (10× larger), quad-SPI interface, 104 MHz max clock, but no HOLD pin and different command set. | Better for high-throughput firmware storage; unsuitable where HOLD-based interrupt handling or legacy SPI simplicity is required. | Choose AT25DF321A-SHN-T only when migrating to faster, denser flash and redesigning driver firmware - not a drop-in replacement. |
Compared with 25AA320AT-I/SN, the 25LC320AT-I/SN offers identical functionality at higher minimum voltage, while the AT25DF321A-SHN-T trades simplicity and HOLD support for density and speed - making the 25AA320AT-I/SN optimal for cost-sensitive, interrupt-aware 1.8V–5.5V embedded designs.
Availability
25AA320AT-I/SN is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply, AEC-Q100 qualification, and long-term EEPROM data integrity.
Supply support for 25AA320AT-I/SN 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25AA320A family was designed specifically for SPI-based embedded systems needing reliable, low-voltage, AEC-Q100-qualified serial EEPROM - targeting automotive, industrial, and medical applications where data retention and write robustness are critical.
FAQ
What is the minimum supply voltage required for reliable operation of the 25AA320AT-I/SN?
The 25AA320AT-I/SN operates reliably from 1.8V to 5.5V. At 1.8V, maximum clock frequency is 3 MHz per AC specifications; full 10 MHz operation requires VCC ≥ 4.5V. This wide VCC range allows direct integration with 1.8V logic families and eliminates level shifters in mixed-voltage systems - a key advantage of the 25AA320AT-I/SN over narrower-range alternatives.
Does the 25AA320AT-I/SN support page write operations, and what is the page size?
Yes, the 25AA320AT-I/SN supports page write operations with a fixed 32-byte page size. Up to 32 consecutive bytes within the same physical page (aligned to 0x00, 0x20, 0x40, etc.) can be loaded before initiating the internal write cycle. Crossing a page boundary wraps data to the start of the current page - a behavior explicitly documented for the 25AA320AT-I/SN and requiring host firmware awareness.
How does hardware write protection work on the 25AA320AT-I/SN?
Hardware write protection on the 25AA320AT-I/SN is enabled when both the WP pin is driven low and the WPEN bit (STATUS register bit 7) is set to 1. When active, it disables writes to nonvolatile STATUS register bits only - memory array reads, writes, and byte/page programming remain fully functional. This selective lock prevents accidental corruption of protection settings while preserving application data flexibility - a defining feature of the 25AA320AT-I/SN.
Is the 25AA320AT-I/SN AEC-Q100 qualified, and for which grade?
Yes, the 25AA320AT-I/SN is AEC-Q100 qualified for Grade 2 (−40°C to +105°C ambient), with full characterization across the industrial temperature range (−40°C to +85°C). This qualification confirms its suitability for automotive body electronics, infotainment, and ADAS subsystems where reliability under thermal stress is mandatory - a key differentiator of the 25AA320AT-I/SN versus generic commercial EEPROMs.
What is the purpose of the HOLD pin on the 25AA320AT-I/SN, and how is it used?
The HOLD pin on the 25AA320AT-I/SN suspends ongoing SPI communication (e.g., mid-read or mid-write sequence) without resetting internal state, allowing the host MCU to service higher-priority interrupts and resume exactly where it left off. To activate, HOLD must be pulled low while SCK is low; resumption occurs on HOLD high with SCK low. This deterministic pause/resume behavior is essential for real-time systems using the 25AA320AT-I/SN.
25AA320AT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25AA320AT-I/SN FAQ
1.How can I place an order for 25AA320AT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA320AT-I/SN 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 25AA320AT-I/SN reliable?
The price and inventory of 25AA320AT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA320AT-I/SN is usually 5 days.
3.What payment methods are accepted for 25AA320AT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA320AT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA320AT-I/SN?
25AA320AT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA320AT-I/SN 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 25AA320AT-I/SN?
For technical support, including 25AA320AT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA320AT-I/SN requirements.
6.How does Aetrix verify that 25AA320AT-I/SN is sourced from the original manufacturer or authorized distributors?
All 25AA320AT-I/SN 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 25AA320AT-I/SN meets industry standards.
7.What is the process for return or replacement of 25AA320AT-I/SN?
All 25AA320AT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25AA320AT-I/SN, 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 25AA320AT-I/SN part is unused and in its original packaging.
Return procedure for 25AA320AT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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