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Microchip Technology 25AA320AX-I/ST
- Part No.:
- 25AA320AX-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
25AA320AX-I/ST.pdf
- Description:
- IC EEPROM 32KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
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Product details
Overview
25AA320AX-I/ST from Microchip Technology 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 delivers 5 µA standby current. It is used for nonvolatile configuration storage in microcontroller-based embedded systems requiring AEC-Q100-qualified reliability.
For engineers reviewing the 25AA320AX-I/ST datasheet, 25AA320AX-I/ST pinout, 25AA320AX-I/ST application, or 25AA320AX-I/ST equivalent, key selection criteria include SPI interface compatibility, write-protection flexibility (BP0/BP1), HOLD functionality for interrupt-safe operation, and TSSOP-8 packaging suitability for space-constrained PCB layouts.
Technical Context
The 25AA320AX-I/ST implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and SCK-synchronized communication. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generation circuitry for EEPROM programming.
It features hardware-assisted write protection via WP pin and STATUS register bits (BP0/BP1), programmable block protection (none/1/4/1/2/all), and HOLD pin support for pausing serial transfers mid-sequence without reset-critical for real-time host interrupt handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit), enabling storage of firmware parameters or calibration data in compact MCU systems. |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO - minimal GPIO usage on host controller. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V, supporting fast read/write cycles in high-throughput applications like sensor node logging. |
| Page Size | 32 bytes, defining maximum contiguous write length per command; crossing page boundaries wraps data within same page. |
| Write Cycle Time | ≤5 ms self-timed internal write, eliminating need for external timing control during programming. |
| Endurance & Retention | >1 million erase/write cycles and >200 years data retention, ensuring long-term reliability in unattended equipment. |
| Supply Voltage Range | 1.8V to 5.5V, allowing direct interfacing with both low-voltage MCUs (1.8V/3.3V) and legacy 5V systems. |
Pinout & Package
25AA320AX-I/ST is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 3.0 mm × 4.4 mm body, and exposed pad option (not electrically connected by default).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable signal; deselecting places SO in high-impedance state for multi-device SPI bus sharing. |
| SO (Pin 2) | Serial Data Output | Outputs memory data on falling edge of SCK; tri-states immediately when HOLD goes low. |
| WP (Pin 3) | Write-Protect Pin | Hardware lock for STATUS register when WPEN=1; no effect if WPEN=0, enabling flexible system-level protection schemes. |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; must be low-impedance for stable SPI timing and noise immunity. |
| SI (Pin 5) | Serial Data Input | Accepts instructions, addresses, and write data on rising edge of SCK; sampled after CS assertion. |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock synchronizing all SPI transactions; rise/fall times ≤2 µs required for 10 MHz operation. |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transfer without resetting address pointer; requires SCK low before assertion for reliable activation. |
| VCC (Pin 8) | Supply Voltage | Power input (1.8–5.5V); internal regulation enables consistent performance across voltage range with 5 µA standby draw. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selectable protection of none, upper 1/4, upper 1/2, or entire array via BP0/BP1 bits - prevents accidental overwrites in critical sectors. |
| HOLD Functionality | Enables host CPU to service higher-priority interrupts mid-transfer without losing SPI context or reinitializing sequence. |
| Power-On Write Protection | Write enable latch resets at power-up, and WREN must be explicitly issued before any write - eliminates spurious writes during brown-out. |
| RoHS & AEC-Q100 Qualified | Complies with automotive-grade reliability standards (Grade 2: −40°C to +105°C ambient, qualified to +85°C junction), suitable for under-hood and industrial control. |
| ESD Robustness | 4 kV HBM ESD rating on all pins ensures resilience against handling and board-level electrostatic discharge events. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Storing calibrated sensor offsets and linearization coefficients in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed via SPI during MCU boot or periodic recalibration. Use Value: 32-byte page writes enable efficient updates of multi-parameter calibration sets without full-array erasure. | Use Scenario: Retaining seat position memory, mirror settings, and lighting preferences in vehicle door modules. IC Role / Device Role / Timing Role: SPI EEPROM providing persistent user preference storage independent of main ECU power rail. Use Value: AEC-Q100 qualification and 200-year data retention ensure settings survive vehicle lifetime without corruption. |
| Medical Diagnostic Handheld | Smart Energy Meter |
Use Scenario: Saving device serial number, calibration history, and last-test timestamp in portable ultrasound probes. IC Role / Device Role / Timing Role: Secure, low-power configuration memory interfaced to ARM Cortex-M0+ host via hardware SPI. Use Value: 1.8V minimum VCC allows direct connection to 1.8V MCU I/O rails, eliminating level-shifting components. | Use Scenario: Logging tamper events, firmware version, and metering constants in utility-grade electricity meters. IC Role / Device Role / Timing Role: Industrial-grade nonvolatile memory storing regulatory-critical operational records. Use Value: Block protection (BP1/BP0) isolates firmware constants from field-updatable event logs, preventing accidental overwrite. |
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/ST | VCC range 2.5–5.5V; otherwise identical pinout, timing, and feature set. | Not rated for 1.8V operation - unsuitable for ultra-low-voltage systems. | Select 25AA320AX-I/ST when 1.8V compatibility or wider supply margin is required. |
| AT25DF321A-SSH-T | 32-Mbit density, quad SPI interface, 100 MHz max clock; different instruction set and protection model. | Higher density and speed but requires firmware redesign; lacks HOLD pin and hardware WP pin. | Choose only if migrating to faster, larger memory with SPI flash architecture and software rewrite is acceptable. |
Compared with 25LC320AT-I/ST, the 25AA320AX-I/ST supports lower-voltage operation down to 1.8V, making it suitable for energy-sensitive designs; versus AT25DF321A-SSH-T, it offers simpler SPI protocol, built-in HOLD, and hardware write protection - reducing firmware complexity and improving interrupt safety.
Availability
25AA320AX-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and medical handheld diagnostics requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant reliability.
Supply support for 25AA320AX-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, FPGA, 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 needing reliable, SPI-compatible nonvolatile storage - especially where wide VCC range and automotive qualification are essential.
FAQ
What is the maximum operating clock frequency for the 25AA320AX-I/ST?
The 25AA320AX-I/ST supports up to 10 MHz clock frequency when VCC is between 4.5V and 5.5V. At 2.5V ≤ VCC < 4.5V, maximum clock drops to 5 MHz, and at 1.8V ≤ VCC < 2.5V, it is limited to 3 MHz. These limits ensure reliable setup/hold timing across voltage ranges and are specified in Table 1-2 of the DS20001828H datasheet. The 25AA320AX-I/ST maintains full functionality across its entire 1.8V–5.5V supply range.
Does the 25AA320AX-I/ST support hardware write protection?
Yes, the 25AA320AX-I/ST supports hardware write protection using the WP pin in conjunction with the WPEN bit in the STATUS register. When WPEN = 1 and WP is driven low, writes to nonvolatile STATUS register bits are disabled. All other operations remain functional. If WPEN = 0, the WP pin has no effect, allowing full STATUS register writes regardless of WP state. This dual-layer control is documented in Section 2.3 and Table 3-4 of the 25AA320AX-I/ST datasheet.
What package type does the 25AA320AX-I/ST use?
The 25AA320AX-I/ST uses an 8-lead TSSOP (Thin Shrink Small Outline Package) with 3.0 mm × 4.4 mm body size and 0.65 mm lead pitch. This is confirmed in the Device Selection Table (page 2) and Package Marking Information (page 14) of the DS20001828H datasheet, where "ST" suffix denotes TSSOP packaging. The pinout matches standard TSSOP-8 orientation with CS on Pin 1 and VCC on Pin 8.
How does the HOLD function operate on the 25AA320AX-I/ST?
The HOLD pin on the 25AA320AX-I/ST suspends ongoing SPI communication without resetting the internal address pointer. To activate, HOLD must be pulled low while SCK is low; SO immediately enters high-impedance state. Communication resumes when HOLD is returned high while SCK remains low. During HOLD, SI and SCK transitions are ignored except CS, allowing host CPU to service interrupts safely. This behavior is detailed in Section 2.6 and Figure 1-1 of the datasheet.
Is the 25AA320AX-I/ST qualified for automotive applications?
Yes, the 25AA320AX-I/ST is AEC-Q100 qualified for automotive Grade 2 (−40°C to +105°C ambient, tested to +85°C junction temperature) and rated for Industrial temperature range (−40°C to +85°C). Its qualification is explicitly stated in the Features section (page 1) and Device Selection Table (page 2) of DS20001828H. The "I" in the part number denotes Industrial grade, and the full AEC-Q100 compliance enables use in body electronics, infotainment, and ADAS subsystems.
25AA320AX-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:
- 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-TSSOP
25AA320AX-I/ST FAQ
1.How can I place an order for 25AA320AX-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA320AX-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 25AA320AX-I/ST reliable?
The price and inventory of 25AA320AX-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 25AA320AX-I/ST is usually 5 days.
3.What payment methods are accepted for 25AA320AX-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA320AX-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA320AX-I/ST?
25AA320AX-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA320AX-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 25AA320AX-I/ST?
For technical support, including 25AA320AX-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA320AX-I/ST requirements.
6.How does Aetrix verify that 25AA320AX-I/ST is sourced from the original manufacturer or authorized distributors?
All 25AA320AX-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 25AA320AX-I/ST meets industry standards.
7.What is the process for return or replacement of 25AA320AX-I/ST?
All 25AA320AX-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 25AA320AX-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 25AA320AX-I/ST part is unused and in its original packaging.
Return procedure for 25AA320AX-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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