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Microchip Technology 25AA320AT-I/MNY
- Part No.:
- 25AA320AT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
25AA320AT-I/MNY.pdf
- Description:
- IC EEPROM 32KBIT SPI 10MHZ 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,474
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Product details
Overview
25AA320AT-I/MNY 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 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/MNY datasheet, 25AA320AT-I/MNY pinout, 25AA320AT-I/MNY application, or 25AA320AT-I/MNY equivalent, key selection considerations include SPI timing compliance at 1.8V–5.5V VCC, 5 ms max self-timed write cycle, block-level write protection (0/¼/½/all array), HOLD pin support for interrupt-safe bus suspension, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The 25AA320AT-I/MNY implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI (data-in) and SO (data-out) lines, CS-controlled selection, and SCK-synchronized transfers. All instructions (READ, WRITE, WREN, RDSR, etc.) are 8-bit MSB-first, with address and data transferred on rising/falling edges per SPI protocol.
It integrates an internal HV generator for EEPROM programming, a status register with WIP/WEL/BP0/BP1 bits, and hardware write-protection logic that gates nonvolatile STATUS writes when WP is low and WPEN=1. The HOLD pin suspends ongoing serial sequences without resetting internal state, enabling deterministic host interrupt handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit), directly addressable via 12-bit internal pointer; supports sequential read across full address space with rollover. |
| Interface | SPI-compatible serial bus (Mode 0,0 or 1,1); requires CS, SCK, SI, SO, WP, HOLD - no I²C or UNI/O compatibility. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V; reduced to 5 MHz (2.5V ≤ VCC < 4.5V) or 3 MHz (1.8V ≤ VCC < 2.5V) - dictates maximum sustained data throughput. |
| Write Cycle Time | ≤5 ms self-timed internal write (TWC); no external delay required, but host must poll WIP bit or wait before next access. |
| Endurance & Retention | >1 million erase/write cycles at +25°C/5.5V; data retention >200 years - validated for long-life embedded logging and calibration storage. |
| VCC Range | 1.8V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
| Temperature Range | Industrial grade: –40°C to +85°C - qualified for operation in automotive ECUs, industrial PLCs, and outdoor IoT nodes. |
Pinout & Package
25AA320AT-I/MNY is packaged in an 8-lead MSOP (MNY) with 3.0 mm × 3.0 mm body, 0.65 mm pitch, and exposed pad (optional VSS connection). Pin numbering follows standard MSOP orientation (pin 1 = CS, top-left corner).
| 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 TWC; high-Z SO when deasserted. |
| SO | Serial Data Output | Tri-state open-drain output; data shifted out on SCK falling edge; enters high-impedance when CS high or HOLD low. |
| WP | Write-Protect Input | Hardware gate for STATUS register writes when WPEN=1; no effect on array writes unless BP bits configured; grounded for permanent lock. |
| VSS | Ground Reference | Primary return path for all digital and internal charge-pump circuits; must be low-impedance for reliable write cycling. |
| SI | Serial Data Input | CMOS input latching instruction/address/data on SCK rising edge; accepts 0.7×VCC high threshold per DC specs. |
| SCK | Serial Clock Input | Asynchronous master clock; defines timing for all SPI transfers; rise/fall times ≤2 µs required for 10 MHz operation. |
| HOLD | Bus Hold Control | Pauses active SPI sequence without reset; SO tri-states immediately; resume requires HOLD↑ while SCK low. |
| VCC | Supply Voltage | Power source for logic and EEPROM programming; internal charge pump derives programming voltage; bypass capacitor mandatory. |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Capability | 32-byte page buffer enables burst writes within same physical page (0x000–0x01F, 0x020–0x03F, etc.), reducing total write cycles vs. byte-by-byte. |
| Block Write Protection | BP0/BP1 bits in STATUS register allow selective locking of 0%, 25%, 50%, or 100% of memory - prevents accidental overwrites in critical sectors. |
| Power-On Write Safety | Write enable latch resets at power-up; WREN instruction required before any write - eliminates spurious writes during brown-out or reset. |
| HOLD Functionality | Enables deterministic pause/resume of multi-byte SPI transfers during host interrupts - avoids retransmission overhead and timing jitter. |
| AEC-Q100 Qualification | Qualified to Automotive Electronics Council standard for stress testing (HTOL, TC, ESD, etc.), supporting deployment in under-hood and infotainment modules. |
Applications
| Automotive Body Control Module | Industrial Sensor Node |
|---|---|
Use Scenario: Storing vehicle-specific calibration offsets (e.g., door actuator limits, mirror position presets) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed via SPI during MCU boot; write occurs only during service mode or learning procedure. Use Value: Enables field-updatable calibration without requiring external MCU flash partitioning or battery-backed RAM. |
Use Scenario: Logging sensor thresholds, factory-set gain values, and last-known fault codes in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-power SPI EEPROM interfaced to 3.3V ARM Cortex-M0+; reads occur at startup, writes triggered by configuration change or error event. Use Value: 5 µA standby current extends 10-year battery life; 1.8V operation ensures compatibility with energy-harvesting power supplies. |
| Medical Infusion Pump | Smart Home Thermostat |
Use Scenario: Retaining drug library metadata, dose history, and user preferences across power loss in Class II medical devices. IC Role / Device Role / Timing Role: Secure configuration store with hardware WP pin tied low and WPEN set - prevents runtime corruption of safety-critical parameters. Use Value: Block protection (BP1/BP0 = 11) locks entire array; >200-year data retention meets FDA long-term traceability requirements. |
Use Scenario: Saving user schedules, HVAC calibration coefficients, and Wi-Fi credentials in residential climate controllers. IC Role / Device Role / Timing Role: SPI EEPROM co-located with ESP32 host; HOLD pin used to suspend reads during OTA firmware update to avoid bus contention. Use Value: HOLD functionality guarantees atomic configuration reload post-update without SPI transaction restart or timeout handling. |
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/MNY | Same pinout and instruction set, but VCC min = 2.5V; not rated for 1.8V operation. | Cannot replace 25AA320AT-I/MNY in 1.8V systems; suitable only where supply is ≥2.5V. | Select 25LC320AT-I/MNY only if system VCC is guaranteed ≥2.5V and 1.8V compatibility is unnecessary. |
| AT25DF321A-MAU-T | 32-Mbit SPI DataFlash with sector erase; no HOLD pin; different command set and status register layout. | Requires firmware rewrite for erase/write commands; lacks hardware HOLD for interrupt-safe operation. | Choose only if higher density and faster sequential writes are needed and software redesign is acceptable. |
Compared with 25LC320AT-I/MNY and AT25DF321A-MAU-T, the 25AA320AT-I/MNY uniquely supports 1.8V operation and HOLD-based bus arbitration - making it optimal for ultra-low-voltage, interrupt-sensitive embedded designs where firmware portability and power flexibility are critical.
Availability
25AA320AT-I/MNY is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor nodes, medical infusion pumps, and smart home thermostats requiring stable component supply, long-term data integrity, and AEC-Q100-compliant sourcing.
Supply support for 25AA320AT-I/MNY 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 25AA320A family is designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with SPI simplicity, hardware write protection, and automotive-grade robustness - targeting automotive, industrial, and medical end equipment.
FAQ
What is the minimum VCC required for reliable operation of the 25AA320AT-I/MNY?
The 25AA320AT-I/MNY operates reliably from 1.8V to 5.5V. At 1.8V, maximum clock frequency is 3 MHz, and DC parameters (e.g., VOL, VIH) are specified accordingly. Below 1.8V, functionality is not guaranteed - the 25AA320AT-I/MNY must not be powered below its absolute minimum rating.
Does the 25AA320AT-I/MNY support SPI Mode 3,0 (CPOL=1, CPHA=0)?
No. The 25AA320AT-I/MNY supports only SPI Mode 0,0 (CPOL=0, CPHA=0) and Mode 1,1 (CPOL=1, CPHA=1), as confirmed by timing diagrams and functional description. Mode 3,0 is incompatible due to mismatched sampling/transition edges relative to SCK.
How does the HOLD pin behave during an active write cycle in the 25AA320AT-I/MNY?
The HOLD pin has no effect on an ongoing internal write cycle (TWC) in the 25AA320AT-I/MNY. Once initiated by CS rising edge, the write completes autonomously. HOLD only pauses serial communication (READ/WRITE instruction setup), not internal EEPROM programming.
Can the 25AA320AT-I/MNY be used in place of the 25AA320A-SN in a SOIC-8 footprint?
No - the 25AA320AT-I/MNY uses an 8-lead MSOP (MNY) package (3.0 × 3.0 mm), while the 25AA320A-SN uses SOIC-8 (3.9 × 4.9 mm). They are not footprint-compatible; PCB layout and land pattern must match the MNY package dimensions and pitch.
What happens to the write enable latch after a successful WRITE instruction in the 25AA320AT-I/MNY?
After a successful WRITE instruction completes (including internal TWC), the write enable latch (WEL bit) in the 25AA320AT-I/MNY is automatically reset to '0'. Subsequent writes require reissuing WREN - this prevents accidental writes following power glitches or incomplete command sequences.
25AA320AT-I/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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:
- 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-TDFN (2x3)
25AA320AT-I/MNY FAQ
1.How can I place an order for 25AA320AT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA320AT-I/MNY 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/MNY reliable?
The price and inventory of 25AA320AT-I/MNY 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/MNY is usually 5 days.
3.What payment methods are accepted for 25AA320AT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA320AT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA320AT-I/MNY?
25AA320AT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA320AT-I/MNY 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/MNY?
For technical support, including 25AA320AT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA320AT-I/MNY requirements.
6.How does Aetrix verify that 25AA320AT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 25AA320AT-I/MNY 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/MNY meets industry standards.
7.What is the process for return or replacement of 25AA320AT-I/MNY?
All 25AA320AT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 25AA320AT-I/MNY, 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/MNY part is unused and in its original packaging.
Return procedure for 25AA320AT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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