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Microchip Technology 25AA320A-I/P
- Part No.:
- 25AA320A-I/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
25AA320A-I/P.pdf
- Description:
- IC EEPROM 32KBIT SPI 10MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
25AA320A-I/P 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 in embedded industrial controls.
For engineers reviewing the 25AA320A-I/P datasheet, 25AA320A-I/P pinout, 25AA320A-I/P application, or 25AA320A-I/P equivalent, key selection considerations include its 1.8V minimum VCC, 5 ms max self-timed write cycle, AEC-Q100 qualification, RoHS-compliant PDIP-8 package, and SPI interface compatibility with PIC® and other MCU families.
Technical Context
The 25AA320A-I/P 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 generation circuitry for EEPROM programming.
It supports sequential read, byte/page write, and STATUS register access with real-time WIP bit polling. Block protection is configurable via BP0/BP1 bits to lock none, 1/4, 1/2, or all of the 4-KB array - independent of WP pin state when WPEN = 0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit), enabling storage of 4 KB of persistent 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, enabling fast read/write transfers (e.g., ~3.2 µs per byte at full speed) |
| Write Cycle Time | ≤5 ms self-timed internal write, eliminating need for external timing control or busy-wait polling beyond WIP bit check |
| VCC Range | 1.8V to 5.5V, supporting direct interfacing with both 3.3V and 5V microcontrollers without level-shifting |
| Endurance & Retention | >1 million erase/write cycles and >200 years data retention at +25°C, suitable for long-life industrial deployments |
| ESD Protection | >4 kV HBM on all pins, reducing susceptibility to handling-induced damage during assembly and field operation |
Pinout & Package
25AA320A-I/P is supplied in an 8-lead Plastic Dual In-Line Package (PDIP) with 300-mil body width, through-hole mounting, and industry-standard pin spacing (0.100" pitch). Pin 1 is marked with a notch or dot; package meets JEDEC MS-001 standards.
| 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 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; otherwise ignored |
| VSS | Ground Reference | Primary return path for all internal logic and EEPROM programming current; must be low-impedance |
| SI | Serial Data Input | Data/instruction latched on SCK rising edge; accepts 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE) |
| SCK | Serial Clock Input | Synchronizes all SI/SO transfers; max 10 MHz; requires monotonic rise/fall times ≤2 µs |
| HOLD | Communication Suspend | Pauses ongoing SPI sequence when pulled low (SCK must be low); resumes on rising edge; SO tri-states immediately |
| VCC | Supply Voltage | 1.8V–5.5V power input; powers logic, EEPROM array, and HV generator; decoupling capacitor required |
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 |
| Configurable Block Protection | BP0/BP1 bits allow software-selectable lock of upper 1/4 (0xC00–0xFFF), upper 1/2 (0x800–0xFFF), or full array - independent of WP pin |
| Power-On Write Safety | Write enable latch resets at power-up; WREN instruction required before any write - prevents spurious writes during brown-out |
| HOLD Functionality | Enables host MCU to service higher-priority interrupts mid-transfer without losing SPI context or reinitializing communication |
| AEC-Q100 Qualification | Qualified for automotive applications (Grade 3: –40°C to +85°C), validating reliability under thermal cycling, vibration, and ESD stress |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and linearization tables in programmable logic controllers and smart transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed at system boot and during field recalibration via SPI from host MCU. Use Value: Enables traceable, field-updatable calibration without firmware changes; 200-year retention ensures data integrity across equipment lifetime. |
Use Scenario: Holding user-defined therapy parameters, alarm thresholds, and device ID in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, low-power parameter store accessed during startup and runtime via isolated SPI bus. Use Value: AEC-Q100 qualification and >1M endurance support repeated clinical reconfiguration; WP pin prevents accidental overwrite during operation. |
| Automotive Body Control Module | Smart Energy Metering |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and fault logs in vehicle BCMs operating across automotive temperature ranges. IC Role / Device Role / Timing Role: SPI EEPROM interfaced directly with 5V automotive MCUs; WP pin tied to chassis ground for permanent lock of safety-critical defaults. Use Value: Industrial-grade (-40°C to +85°C) operation and 1.8V compatibility allow use with both legacy 5V and modern low-voltage MCUs in same BOM. |
Use Scenario: Recording tariff schedules, meter firmware version, tamper events, and accumulated kWh in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: High-reliability data logger with HOLD support to pause writes during power-fail detection and resume after capacitor hold-up. Use Value: 5 µA standby current extends battery backup life; 4 kV ESD rating withstands field EMI in outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC320A-I/P | Requires VCC ≥ 2.5V; identical pinout, timing, and feature set; shares same datasheet DS20001828H | Not suitable for 1.8V–2.4V systems; otherwise drop-in replacement where supply voltage permits | Select 25LC320A-I/P only if system VCC is guaranteed ≥2.5V; retains full functional equivalence otherwise |
| AT25DF321A-SSH-T | 32-Mbit density (4× larger), quad-SPI capable, 104 MHz max clock, but requires different command set and lacks HOLD pin | Better for high-throughput firmware storage; incompatible with simple SPI-only hosts or HOLD-dependent interrupt handling | Choose only when higher density and speed justify firmware redesign; not a functional substitute for HOLD or 1.8V operation |
Compared with 25LC320A-I/P, the 25AA320A-I/P uniquely supports 1.8V operation and shares identical packaging and pinout, while AT25DF321A-SSH-T offers greater capacity at the cost of SPI protocol complexity and loss of HOLD functionality.
Availability
25AA320A-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for 25AA320A-I/P 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 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-voltage, SPI-based nonvolatile data storage in space-constrained industrial and automotive applications.
FAQ
What is the minimum supply voltage required for 25AA320A-I/P operation?
The 25AA320A-I/P operates down to 1.8V over the full industrial temperature range (–40°C to +85°C), making it compatible with modern low-power microcontrollers and battery-backed systems where 3.3V or 5V rails are unavailable. This 1.8V minimum is a key differentiator from the 25LC320A variant, which requires ≥2.5V.
Does 25AA320A-I/P support page write operations, and what is the page size?
Yes, the 25AA320A-I/P supports page write operations with a fixed 32-byte page size. Up to 32 bytes can be written in a single transaction provided they reside within the same physical page boundary (e.g., addresses 0x000–0x01F). Crossing a page boundary causes wraparound, not automatic page increment.
How does the HOLD pin function in 25AA320A-I/P, and what are its timing requirements?
The HOLD pin suspends ongoing SPI communication without resetting the sequence: it must be driven low while SCK is low, and resumed by driving it high while SCK remains low. During HOLD, SI and SCK transitions are ignored, and SO enters high-impedance state immediately - enabling MCU interrupt servicing.
Is 25AA320A-I/P qualified for automotive applications?
Yes, the 25AA320A-I/P is AEC-Q100 qualified (Grade 3), tested for reliability under automotive environmental stresses including thermal cycling, humidity, and ESD. Its industrial temperature range (–40°C to +85°C) and 4 kV HBM ESD rating meet common automotive subsystem requirements.
What write protection mechanisms does 25AA320A-I/P provide?
The 25AA320A-I/P provides dual-layer write protection: (1) hardware-level via the WP pin (active-low, enabled only when WPEN bit = 1), and (2) software-configurable block protection via BP0/BP1 bits in the STATUS register - allowing lock of none, 1/4, 1/2, or all memory segments independently.
25AA320A-I/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
25AA320A-I/P FAQ
1.How can I place an order for 25AA320A-I/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA320A-I/P 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 25AA320A-I/P reliable?
The price and inventory of 25AA320A-I/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA320A-I/P is usually 5 days.
3.What payment methods are accepted for 25AA320A-I/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA320A-I/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA320A-I/P?
25AA320A-I/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA320A-I/P 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 25AA320A-I/P?
For technical support, including 25AA320A-I/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA320A-I/P requirements.
6.How does Aetrix verify that 25AA320A-I/P is sourced from the original manufacturer or authorized distributors?
All 25AA320A-I/P 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 25AA320A-I/P meets industry standards.
7.What is the process for return or replacement of 25AA320A-I/P?
All 25AA320A-I/P units undergo pre-shipment inspection (PSI). If there is an issue with 25AA320A-I/P, 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 25AA320A-I/P part is unused and in its original packaging.
Return procedure for 25AA320A-I/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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