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Microchip Technology 25LC320AXT-I/ST
- Part No.:
- 25LC320AXT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
25LC320AXT-I/ST.pdf
- Description:
- IC EEPROM 32KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,053
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Product details
Overview
25LC320AXT-I/ST 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 at up to 10 MHz clock frequency with 5 mA read/write current at 5.5 V 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 25LC320AXT-I/ST datasheet, 25LC320AXT-I/ST pinout, 25LC320AXT-I/ST application, or 25LC320AXT-I/ST equivalent, key selection criteria include SPI interface compatibility, 32-byte page write capability, industrial-grade temperature support, built-in power-on write protection, and TSSOP-8 package footprint suitability for space-constrained PCB layouts.
Technical Context
The 25LC320AXT-I/ST implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, HOLD, and WP control signals. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generator for EEPROM programming.
It supports sequential read, byte/page write, and STATUS register access with self-timed internal write cycles (≤5 ms). Block protection is configurable via BP0/BP1 bits to lock none, 1/4, 1/2, or all of the 4-Kbyte 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), compatible with PIC® and most MCU SPI peripherals |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V, permitting high-speed read/write in timing-critical embedded applications |
| Page Size | 32 bytes, defining maximum contiguous write length without crossing physical page boundaries |
| Write Endurance | >1 million erase/write cycles, supporting long-term field deployment in logging or counter applications |
| Data Retention | >200 years at +25°C, ensuring reliable data integrity over product lifetime without refresh |
| Operating Temp | −40°C to +85°C (Industrial grade), validated for use in automotive ECUs, industrial controllers, and outdoor equipment |
Pinout & Package
25LC320AXT-I/ST is housed in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and optimized for automated surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable signal; deselecting places SO in high-impedance to share SPI bus with other devices |
| SO | Serial Data Output | CMOS-compatible output delivering read data on falling edge of SCK; tri-states during HOLD assertion |
| WP | Write-Protect Pin | Hardware-level lock for STATUS register nonvolatile bits when WPEN = 1; grounded to enforce protection |
| VSS | Ground | Reference return path for all digital and internal EEPROM circuitry; must be low-impedance |
| SI | Serial Data Input | Latches instructions, addresses, and write data on rising edge of SCK; requires clean setup/hold timing |
| SCK | Serial Clock Input | Synchronizes all SPI transactions; max 10 MHz rate defines upper bound for system throughput |
| HOLD | Hold Input | Pauses ongoing SPI sequence without reset; allows host MCU to service higher-priority interrupts |
| VCC | Supply Voltage | 2.5 V to 5.5 V operation enables direct interfacing with 3.3 V or 5 V logic domains |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selectable 0%, 25%, 50%, or 100% array lock via BP0/BP1 bits - prevents accidental overwrite of critical firmware sections |
| Power-On Write Protection | Automatic WEL reset at power-up ensures no unintended writes occur before explicit WREN command |
| HOLD Functionality | Real-time SPI suspension without reinitialization - preserves address pointer and avoids communication loss during interrupt handling |
| ESD Robustness | 4 kV HBM rating protects against handling damage and board-level ESD events in manufacturing and field environments |
| Low Standby Current | 5 µA at 5.5 V and +125°C enables battery-backed operation in always-on monitoring systems |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed once per power cycle during sensor initialization. Use Value: Eliminates need for external trimming components and enables field recalibration via firmware update. | Use Scenario: Holding seat position memory, mirror angle presets, and lighting configuration profiles in vehicle door modules. IC Role / Device Role / Timing Role: SPI-connected parameter bank supporting fast read access and infrequent write operations during user setup. Use Value: Survives 15+ year vehicle lifecycle with >200-year data retention and AEC-Q100 qualified reliability. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Securing drug library parameters, dose limits, and alarm thresholds subject to regulatory audit trails. IC Role / Device Role / Timing Role: Write-protected storage accessed under controlled firmware control with WP pin hardwired to ground. Use Value: Hardware-enforced write lock (WPEN=1 + WP=low) prevents unauthorized modification of safety-critical values. | Use Scenario: Storing signed firmware patches and version metadata for secure over-the-air updates in utility meters. IC Role / Device Role / Timing Role: High-endurance EEPROM used for patch staging prior to verified flash programming. Use Value: 1M-cycle endurance supports frequent patch trials during certification and field validation phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA320AT-I/ST | Wider VCC range (1.8–5.5 V); supports 1.8 V logic interfaces; otherwise identical pinout, timing, and memory map | Suitable for ultra-low-power or mixed-voltage systems where 25LC320AXT-I/ST's 2.5 V minimum VCC is incompatible | Select 25AA320AT-I/ST only if 1.8 V operation is required; verify hold time and input threshold specs match host MCU |
| AT25DF041A-SSH-T | 4 Mbit density, quad SPI interface, faster 50 MHz clock, but lacks HOLD pin and hardware WP pin functionality | Better for high-throughput code shadowing or large log buffers; not drop-in for HOLD-dependent or WP-hardened designs | Choose only when bandwidth >10 MHz is needed and HOLD/WP features are unnecessary; requires firmware SPI driver update |
Compared with 25AA320AT-I/ST, the 25LC320AXT-I/ST trades 1.8 V compatibility for tighter VCC min specification, while versus AT25DF041A-SSH-T it prioritizes deterministic HOLD/WP control and proven industrial reliability over raw density and speed - making it optimal for safety-aware, interrupt-sensitive embedded control.
Availability
25LC320AXT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical infusion pump settings requiring stable component supply across extended production lifecycles.
Supply support for 25LC320AXT-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 infrastructure.
The 25LC320A family delivers cost-optimized, AEC-Q100-qualified serial EEPROMs targeting automotive, industrial, and medical applications demanding robust nonvolatile storage with hardware write protection and long-term data integrity.
FAQ
What is the operating voltage range for the 25LC320AXT-I/ST?
The 25LC320AXT-I/ST operates from 2.5 V to 5.5 V. This range ensures compatibility with both 3.3 V and 5 V microcontroller I/O domains. Operation below 2.5 V is not guaranteed and may result in unreliable read/write behavior or STATUS register corruption. The device is not rated for 1.8 V operation - for that, the pin-compatible 25AA320AT-I/ST variant is specified.
Does the 25LC320AXT-I/ST support page write operations, and what is the maximum page size?
Yes, the 25LC320AXT-I/ST 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 (addresses 0x000–0x01F, 0x020–0x03F, etc.). Attempting to cross a page boundary causes wraparound within the current page - software must enforce alignment to avoid unintended overwrites.
How does hardware write protection work on the 25LC320AXT-I/ST?
Hardware write protection on the 25LC320AXT-I/ST requires both the WPEN bit (bit 7 of STATUS register) set to '1' and the WP pin held low. When enabled, this blocks writes to nonvolatile STATUS register bits (BP0, BP1, WPEN) but allows normal memory writes unless block protection bits are also set. If WPEN = 0, the WP pin is ignored, permitting full STATUS register updates regardless of WP pin state.
Is the 25LC320AXT-I/ST AEC-Q100 qualified, and for which stress grades?
Yes, the 25LC320AXT-I/ST is AEC-Q100 qualified for Grade 3 (−40°C to +85°C), matching its Industrial temperature rating. Qualification covers accelerated environmental stress tests including HTOL, TC, UHAST, and ESD - confirming suitability for under-hood and cabin automotive applications where reliability under thermal cycling and electrical noise is critical.
What is the maximum clock frequency supported by the 25LC320AXT-I/ST at 3.3 V supply?
At VCC = 3.3 V, the 25LC320AXT-I/ST supports a maximum clock frequency of 5 MHz, as specified in Table 1-2 (AC CHARACTERISTICS). This is due to reduced drive strength at intermediate voltages; the full 10 MHz rate is only guaranteed for VCC ≥ 4.5 V. System designs using 3.3 V logic must constrain SCK to ≤5 MHz to ensure timing margin compliance.
25LC320AXT-I/ST 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:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
25LC320AXT-I/ST FAQ
1.How can I place an order for 25LC320AXT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320AXT-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 25LC320AXT-I/ST reliable?
The price and inventory of 25LC320AXT-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 25LC320AXT-I/ST is usually 5 days.
3.What payment methods are accepted for 25LC320AXT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320AXT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320AXT-I/ST?
25LC320AXT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320AXT-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 25LC320AXT-I/ST?
For technical support, including 25LC320AXT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320AXT-I/ST requirements.
6.How does Aetrix verify that 25LC320AXT-I/ST is sourced from the original manufacturer or authorized distributors?
All 25LC320AXT-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 25LC320AXT-I/ST meets industry standards.
7.What is the process for return or replacement of 25LC320AXT-I/ST?
All 25LC320AXT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320AXT-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 25LC320AXT-I/ST part is unused and in its original packaging.
Return procedure for 25LC320AXT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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