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Microchip Technology 25C320-E/SN
- Part No.:
- 25C320-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25C320-E/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,723
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Product details
Overview
25C320-E/SN from Microchip Technology Inc. is a 32 Kbit (4096 × 8) SPI-compatible serial EEPROM designed for nonvolatile data storage in embedded systems. It operates at 4.5–5.5 V, supports up to 3 MHz clock frequency, features hardware write protection via WP pin and STATUS register, and delivers 1 million erase/write cycles with >200-year data retention. It is used in industrial control modules for parameter storage and calibration data backup.
For engineers reviewing the 25C320-E/SN datasheet, 25C320-E/SN pinout, 25C320-E/SN application, or 25C320-E/SN equivalent, key selection criteria include its 5V-only supply range, automotive-grade temperature support (−40°C to +125°C), page-write capability (32-byte pages), and integrated HOLD functionality for interrupt-safe SPI communication.
Technical Context
The 25C320-E/SN implements a standard SPI Mode 0,0 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, auto-incrementing address pointer, and STATUS register with WIP, WEL, BP0/BP1, and WPEN bits for configurable block protection.
Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal write cycle (≤5 ms). During active write, memory reads are blocked but STATUS register remains readable - enabling real-time WIP bit polling without bus interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4096 × 8 bits); sufficient for firmware configuration tables or sensor calibration coefficients in compact MCU systems. |
| Supply voltage | 4.5–5.5 V only; compatible with legacy 5V logic domains and eliminates need for level-shifting in 5V microcontroller interfaces. |
| Max clock frequency | 3 MHz at VCC = 4.5–5.5 V; enables fast sequential reads (up to ~384 kB/s theoretical throughput) in time-critical logging applications. |
| Page size | 32 bytes; constrains burst writes to same page boundary (0x000–0x01F, 0x020–0x03F, etc.), requiring software address alignment for efficient programming. |
| Write endurance | 1 million erase/write cycles; supports daily reconfiguration over 27 years, suitable for field-updatable device settings. |
| Data retention | >200 years at +25°C; ensures long-term integrity of stored calibration or security keys without refresh. |
| Operating temperature | −40°C to +125°C (Automotive E grade); qualified for under-hood automotive ECUs and industrial motor drives with wide thermal excursions. |
Pinout & Package
25C320-E/SN is packaged in an 8-pin plastic SOIC (150 mil body), designated SN per Microchip's part numbering system. Pin 1 is CS (Chip Select), pin 2 is SO (Serial Output), pin 3 is WP (Write-Protect), pin 4 is VSS (Ground), pin 5 is SI (Serial Input), pin 6 is SCK (Serial Clock), pin 7 is HOLD, and pin 8 is VCC (Supply Voltage).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select input | Active-low enable: pulls device into active mode; high state forces Standby mode and tri-states SO for multi-device SPI bus sharing. |
| SO (Pin 2) | Serial data output | Provides read data on falling edge of SCK; enters high-impedance when CS is high or HOLD is asserted. |
| WP (Pin 3) | Hardware write-protect control | When WPEN bit is set and WP = low, disables writes to nonvolatile STATUS register bits; does not affect array writes unless BP bits are configured. |
| VSS (Pin 4) | Ground reference | Primary return path for all internal circuitry; must be low-impedance connection to avoid noise-induced write errors. |
| SI (Pin 5) | Serial data input | Latches instructions, addresses, and write data on rising edge of SCK; accepts MSB-first SPI framing. |
| SCK (Pin 6) | Serial clock input | Synchronizes all SPI transfers; rising edge clocks data into device, falling edge clocks data out of SO. |
| HOLD (Pin 7) | Communication suspend control | Halts ongoing SPI sequence (e.g., during MCU interrupt servicing) without resetting state; requires SCK low before assertion. |
| VCC (Pin 8) | Power supply | Must be stable 4.5–5.5 V; internal power-on reset clears write enable latch and initializes STATUS register defaults. |
Key Features
| Feature | Design Value |
|---|---|
| Block write protection | Configurable via BP0/BP1 bits to protect none, upper 1/4 (0xC00–0xFFF), upper 1/2 (0x800–0xFFF), or entire array (0x000–0xFFF) - enabling secure storage of boot code or factory settings. |
| Self-timed write cycle | Internal 5 ms max write completion eliminates need for external timing delays; WIP bit in STATUS register allows precise polling-based synchronization. |
| Low-power operation | 500 nA typical standby current and 3 mA max write current enable use in battery-backed systems with multi-year shelf life. |
| HOLD function | Pauses SPI transfer mid-sequence without losing address or instruction context - critical for deterministic interrupt response in real-time control loops. |
| ESD robustness | >4000 V HBM rating protects against handling damage and board-level transients in industrial assembly and field service environments. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
|
Use Scenario: Stores calibrated offset/gain values for analog sensor front-ends in wireless condition-monitoring nodes. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed at power-up and during field recalibration via SPI. Use Value: Enables plug-and-play sensor replacement without manual reprogramming; 1M endurance supports lifetime field updates. |
Use Scenario: Retains user preferences (window position, mirror angle, lighting profiles) across ignition cycles in vehicle door modules. IC Role / Device Role / Timing Role: SPI-connected parameter memory with WP pin hardwired to chassis ground for tamper-resistant storage. Use Value: −40°C to +125°C rating ensures reliable operation near power electronics; hardware write protection prevents accidental overwrite during CAN firmware updates. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Logs dose history, alarm events, and calibration logs for regulatory audit trails in Class II medical devices. IC Role / Device Role / Timing Role: Secure, long-retention data logger interfaced to safety-certified MCU via isolated SPI. Use Value: >200-year data retention satisfies FDA 21 CFR Part 11 requirements for permanent electronic records; HOLD pin enables safe logging during priority therapy interrupts. |
Use Scenario: Stores tariff schedules, metering constants, and tamper-event timestamps in utility-grade electricity meters. IC Role / Device Role / Timing Role: SPI EEPROM with BP bits protecting metrology constants from unauthorized modification. Use Value: Block protection isolates critical calibration data from application firmware updates; 5V operation matches legacy meter ASIC I/O voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC320-E/SN | 2.5–5.5 V supply range; 2 MHz max clock; rated for −40°C to +125°C; shares identical pinout and instruction set. | Broader VCC range enables use with 3.3V MCUs; lower max clock limits throughput in high-speed logging. | Select when system uses mixed 3.3V/5V rails and requires automotive temp grade but not strict 5V-only compatibility. |
| 25AA320-I/SN | 1.8–5.5 V supply; 1 MHz max clock; rated for −40°C to +85°C; identical package and pinout. | Supports ultra-low-voltage operation down to 1.8V; industrial temp grade suffices for indoor consumer/industrial equipment. | Choose for battery-powered IoT endpoints where 1.8V wake-up operation and lower cost outweigh automotive qualification needs. |
Compared with 25C320-E/SN, the 25LC320-E/SN offers wider voltage flexibility at reduced speed, while the 25AA320-I/SN enables 1.8V operation and lowers cost for non-automotive applications - both retain full functional and pinout compatibility but differ in supply range, speed, and temperature qualification.
Availability
25C320-E/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for 25C320-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The 25C320 belongs to Microchip's legacy 25XX320 serial EEPROM family, engineered for robust, low-power nonvolatile storage in 5V embedded systems requiring automotive-grade reliability and SPI simplicity.
FAQ
What is the operating voltage range of the 25C320-E/SN?
The 25C320-E/SN operates strictly within 4.5 V to 5.5 V. Unlike the 25AA320 or 25LC320 variants, it is not rated for voltages below 4.5 V. This makes it suitable for legacy 5V systems but incompatible with 3.3V or mixed-voltage designs without level translation. The 25C320-E/SN datasheet specifies no operation outside this window, and attempting to power it below 4.5 V may result in unreliable write cycles or STATUS register corruption.
Does the 25C320-E/SN support SPI Mode 0,0 exclusively?
Yes, the 25C320-E/SN supports only SPI Mode 0,0 (CPOL = 0, CPHA = 0): SCK idles low, data sampled on rising edge, and output changes on falling edge. It does not support Mode 1,1 or other variants. This is confirmed by the timing diagrams and AC characteristics table in DS21227F, which define setup/hold times relative to SCK rising/falling edges consistent with Mode 0,0 only. Any host controller must be configured accordingly.
How does hardware write protection work on the 25C320-E/SN?
Hardware write protection on the 25C320-E/SN requires both the WP pin held low *and* the WPEN bit set high in the STATUS register. When enabled, it prevents writes to nonvolatile STATUS bits (BP0, BP1, WPEN) - not the main memory array. Array protection is controlled separately via BP0/BP1 bits. If WPEN = 0, the WP pin has no effect. This dual-control mechanism allows safe deployment in systems with grounded WP pins while retaining STATUS register programmability during initialization.
What is the maximum page write size for the 25C320-E/SN?
The 25C320-E/SN supports a maximum page write size of 32 bytes. All bytes in a single WRITE instruction must reside within the same 32-byte page boundary (e.g., addresses 0x000–0x01F). Crossing a page boundary causes the internal address pointer to wrap, overwriting earlier bytes in the page. This constraint requires firmware to align write buffers and split multi-page updates - a key design consideration reflected in the device's "32 Byte Page" feature listing in DS21227F.
Is the 25C320-E/SN pin-compatible with other 25XX320 variants in SOIC-8 packaging?
Yes, the 25C320-E/SN is fully pin-compatible with 25AA320-I/SN and 25LC320-E/SN in the 8-pin SOIC (SN) package: Pin 1 = CS, Pin 2 = SO, Pin 3 = WP, Pin 4 = VSS, Pin 5 = SI, Pin 6 = SCK, Pin 7 = HOLD, Pin 8 = VCC. This allows direct substitution in existing layouts, provided the system's voltage range (4.5–5.5 V), temperature requirements (−40°C to +125°C), and clock speed (≤3 MHz) match the 25C320-E/SN specifications.
25C320-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:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25C320-E/SN FAQ
1.How can I place an order for 25C320-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25C320-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 25C320-E/SN reliable?
The price and inventory of 25C320-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 25C320-E/SN is usually 5 days.
3.What payment methods are accepted for 25C320-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25C320-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25C320-E/SN?
25C320-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25C320-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 25C320-E/SN?
For technical support, including 25C320-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25C320-E/SN requirements.
6.How does Aetrix verify that 25C320-E/SN is sourced from the original manufacturer or authorized distributors?
All 25C320-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 25C320-E/SN meets industry standards.
7.What is the process for return or replacement of 25C320-E/SN?
All 25C320-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25C320-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 25C320-E/SN part is unused and in its original packaging.
Return procedure for 25C320-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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