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Microchip Technology 25LC320A-E/SN
- Part No.:
- 25LC320A-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC320A-E/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,849
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Product details
Overview
25LC320A-E/SN from Microchip Technology Inc. is a 32-Kbit SPI Serial EEPROM with 4096 × 8-bit organization, 32-byte page size, and extended temperature support (–40°C to +125°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 automotive engine control units for storing calibration data requiring AEC-Q100 qualification.
For engineers reviewing the 25LC320A-E/SN datasheet, 25LC320A-E/SN pinout, 25LC320A-E/SN application, or 25LC320A-E/SN equivalent, key selection criteria include extended-temperature SPI EEPROM compatibility, block-level write protection granularity, HOLD pin interrupt-suspend capability, and SOIC-8 (SN) package footprint alignment with legacy board designs.
Technical Context
The 25LC320A-E/SN implements a standard SPI Mode 0,0 interface with separate SI (data-in) and SO (data-out) lines, CS-controlled device selection, and SCK-synchronized communication. 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 (RDSR/WRSR), with self-timed internal write cycles completing in ≤5 ms. The HOLD pin enables mid-sequence pause/resume without reinitialization, and the WP pin-when enabled via WPEN bit-blocks writes to nonvolatile STATUS bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit array), enabling storage of firmware patches or sensor calibration tables in space-constrained ECUs. |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO, WP, HOLD - minimal GPIO overhead on microcontrollers. |
| Page Size | 32 bytes, constraining write bursts to single-page boundaries; software must manage address wraparound to avoid unintended overwrites. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V, delivering ~1.25 MB/s theoretical throughput for rapid configuration loading. |
| Write Endurance | >1 million erase/write cycles, supporting daily recalibration logging over 27+ years of operation. |
| Data Retention | >200 years at +25°C, ensuring long-term integrity of stored vehicle VINs, security keys, or tuning maps without refresh. |
| Temperature Range | –40°C to +125°C (Extended grade), qualified per AEC-Q100 Grade 1, suitable for under-hood automotive placement. |
| Supply Voltage | 2.5 V to 5.5 V, compatible with 3.3 V and 5 V MCU I/O domains without level-shifting. |
Pinout & Package
8-Lead Plastic Small Outline (SN) package - narrow body, 3.90 mm width, 1.27 mm pitch, JEDEC MS-012AC compliant. RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: pulls device out of standby; rising edge after valid write initiates internal write cycle; high-Z SO when deasserted. |
| SO (Pin 2) | Serial Data Output | Tri-state output: data shifted out on SCK falling edge; enters high-impedance state when CS high or HOLD low. |
| WP (Pin 3) | Write-Protect Pin | Hardware lock: disables STATUS register writes when WP = low and WPEN = 1; no effect on memory writes unless BP bits are set. |
| VSS (Pin 4) | Ground | Reference return path for all digital and EEPROM programming currents; must be low-impedance for reliable write verification. |
| SI (Pin 5) | Serial Data Input | Instruction/address/data input: sampled on SCK rising edge; supports 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE). |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock: defines timing for SI sampling and SO updates; max 10 MHz at 4.5–5.5 V. |
| HOLD (Pin 7) | Hold Input | Pause control: suspends ongoing SPI transfer when pulled low during SCK low; resumes on next SCK low-to-high if HOLD returns high. |
| VCC (Pin 8) | Supply Voltage | Power rail: 2.5–5.5 V operation; internal charge pump generates programming voltage; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selectable protection of none / 1/4 / 1/2 / full memory array via BP0/BP1 bits - prevents accidental overwrite of critical boot or safety-critical sectors. |
| Self-Timed Write Cycle | ≤5 ms internal write completion with no external timing control needed - simplifies firmware by eliminating busy-wait loops for most operations. |
| Power-On Write Protection | Write enable latch resets at power-up, and WP circuitry blocks writes until WREN issued - prevents corruption during brown-out or reset sequences. |
| HOLD Functionality | Mid-transfer suspension without sequence restart - allows host MCU to service higher-priority interrupts (e.g., CAN frame reception) then resume EEPROM access seamlessly. |
| AEC-Q100 Qualification | Qualified for automotive Grade 1 (–40°C to +125°C), including stress testing for temperature cycling, HTOL, and ESD (>4 kV HBM) - meets functional safety prerequisite for ASIL-B systems. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing fuel map coefficients, ignition timing offsets, and OBD-II diagnostic codes that require field updates via dealer flash tools. IC Role / Device Role / Timing Role: Nonvolatile configuration store interfaced via SPI to 32-bit automotive MCU; accessed during boot and runtime for real-time parameter lookup. Use Value: AEC-Q100 qualification ensures reliability across thermal cycles; 200-year data retention eliminates need for periodic refresh; 32-byte page writes optimize update speed for small calibration deltas. | Use Scenario: Holding door lock logic states, window position memory, and lighting dimming profiles across vehicle power cycles. IC Role / Device Role / Timing Role: Persistent parameter storage accessed asynchronously by BCM microcontroller during wake-up or user interaction events. Use Value: HOLD pin enables interruption-free operation during CAN bus arbitration; WP pin + BP bits prevent unauthorized modification of safety-critical lock/unlock sequences. |
| Industrial PLC Configuration Backup | Medical Infusion Pump Settings |
Use Scenario: Saving ladder logic parameters, I/O mapping, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: SPI EEPROM co-located with main controller; written during commissioning or firmware upgrade; read at startup to restore operational state. Use Value: Extended temperature range (–40°C to +125°C) supports operation near industrial heat sources; >1M endurance accommodates frequent reconfiguration during maintenance. | Use Scenario: Storing drug library definitions, flow rate limits, and clinician-accessible safety overrides in battery-powered infusion devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage element interfaced to low-power ARM Cortex-M0+; accessed only during setup or error recovery. Use Value: Hardware write protection (WP + WPEN) prevents accidental or malicious alteration of dose limits; 5 µA standby current extends battery life between calibrations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA320A-I/SN | Wider VCC range (1.8–5.5 V); Industrial temp (–40°C to +85°C); identical pinout and instruction set. | Lacks AEC-Q100 qualification and extended temperature support; unsuitable for under-hood automotive use. | Select when operating below 2.5 V or cost-sensitive industrial designs where extended temp is unnecessary. |
| AT25DF041A-SHN-T | 4 Mbit density; quad SPI support; 3 V only (2.7–3.6 V); different command set and status register layout. | Higher density but incompatible protocol; requires firmware rewrite and layout change due to different pin assignment (e.g., IO2/IO3 pins). | Choose only when migrating to higher-density flash with quad interface; not a drop-in replacement for 25LC320A-E/SN. |
Compared with 25AA320A-I/SN, the 25LC320A-E/SN provides guaranteed operation up to +125°C and AEC-Q100 compliance for automotive deployment, while AT25DF041A-SHN-T offers greater capacity and faster quad reads but demands full hardware and software redesign.
Availability
25LC320A-E/SN is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical device manufacturing requiring stable component supply with long lifecycle assurance.
Supply support for 25LC320A-E/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions for embedded and automotive markets.
The 25LC320A-E/SN belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, SPI-based nonvolatile storage in harsh-environment applications demanding AEC-Q100 qualification and long-term data integrity.
FAQ
What is the maximum clock frequency supported by the 25LC320A-E/SN?
The 25LC320A-E/SN supports up to 10 MHz clock frequency when VCC is 4.5 V to 5.5 V. At 2.5 V ≤ VCC < 4.5 V, the maximum clock is 5 MHz, and at 1.8 V ≤ VCC < 2.5 V, it drops to 3 MHz. These limits ensure reliable setup/hold timing across voltage and temperature ranges, and the 25LC320A-E/SN datasheet specifies AC characteristics accordingly for each condition.
Does the 25LC320A-E/SN support hardware write protection?
Yes, the 25LC320A-E/SN supports hardware write protection via the WP pin in conjunction with the WPEN bit in the STATUS register. When WP is low and WPEN = 1, writes to nonvolatile STATUS bits are disabled. The 25LC320A-E/SN also supports block protection (BP0/BP1) for memory segments - independent of WP pin state - allowing flexible, layered security for calibration or safety-critical data.
What package type does the 25LC320A-E/SN use?
The 25LC320A-E/SN uses the 8-Lead Plastic Small Outline (SN) package - narrow body, 3.90 mm width, 1.27 mm pitch, JEDEC MS-012AC compliant. This SOIC-8 footprint matches legacy industrial and automotive PCB layouts and is verified in Microchip's packaging specification C04-057-SN Rev F.
How does the HOLD pin function on the 25LC320A-E/SN?
The HOLD pin on the 25LC320A-E/SN suspends ongoing SPI communication without resetting the sequence. It must be asserted low while SCK is low; SO immediately tri-states, and SI/SCK transitions are ignored. To resume, HOLD must return high while SCK is low. This allows the host MCU to service time-critical interrupts (e.g., CAN, timer) and continue the 25LC320A-E/SN transaction from the exact point of suspension.
Is the 25LC320A-E/SN qualified for automotive applications?
Yes, the 25LC320A-E/SN is AEC-Q100 Qualified (Grade 1) for extended temperature operation from –40°C to +125°C. It undergoes stress testing including temperature cycling, high-temperature operating life (HTOL), and ESD (>4 kV HBM), making it suitable for under-hood automotive applications such as engine control units and body control modules where reliability under thermal and electrical stress is mandatory.
25LC320A-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC320A-E/SN FAQ
1.How can I place an order for 25LC320A-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320A-E/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 25LC320A-E/SN reliable?
The price and inventory of 25LC320A-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC320A-E/SN is usually 5 days.
3.What payment methods are accepted for 25LC320A-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320A-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320A-E/SN?
25LC320A-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320A-E/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 25LC320A-E/SN?
For technical support, including 25LC320A-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320A-E/SN requirements.
6.How does Aetrix verify that 25LC320A-E/SN is sourced from the original manufacturer or authorized distributors?
All 25LC320A-E/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 25LC320A-E/SN meets industry standards.
7.What is the process for return or replacement of 25LC320A-E/SN?
All 25LC320A-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320A-E/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 25LC320A-E/SN part is unused and in its original packaging.
Return procedure for 25LC320A-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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