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Microchip Technology 25C320T/SN
- Part No.:
- 25C320T/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25C320T/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
25C320T/SN from Microchip Technology Inc. is a 32 Kbit SPI serial EEPROM IC designed for nonvolatile data storage in microcontroller-based systems. It features 4096 × 8-bit organization, 32-byte page write capability, 5 ms max write cycle time, and operates at 4.5–5.5 V with up to 3 MHz clock frequency. It is used in industrial control panels for parameter retention across power cycles.
For engineers reviewing the 25C320T/SN datasheet, 25C320T/SN pinout, 25C320T/SN application, or 25C320T/SN equivalent, key selection criteria include VCC range (4.5–5.5 V), automotive-grade temperature support (−40°C to +125°C), SPI interface timing compliance, and hardware write protection via WP pin and STATUS register.
Technical Context
The 25C320T/SN implements a standard SPI Mode 0,0 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, auto-incrementing address pointer for sequential reads, and a STATUS register with WIP, WEL, BP0/BP1, and WPEN bits.
Write operations require explicit WREN instruction followed by WRITE command and address/data; page writes are limited to 32 bytes within the same 32-byte boundary. Block protection supports four configurations (none, upper 1/4, upper 1/2, or full array), and hardware write protection engages only when WP = low and WPEN = 1 in STATUS register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4096 × 8-bit), sufficient for firmware configuration tables or calibration data in embedded controllers |
| Interface | SPI-compatible serial bus (Mode 0,0), enabling direct connection to PIC, AVR, ARM, and other MCU SPI peripherals |
| VCC range | 4.5–5.5 V, compatible with legacy 5 V logic systems and industrial power rails |
| Max clock frequency | 3 MHz at VCC = 4.5–5.5 V, supporting fast read/write transfers without requiring high-speed MCU peripherals |
| Write cycle time | 5 ms maximum, defining worst-case latency for persistent data commits during system shutdown or fault recovery |
| Data retention | >200 years, ensuring long-term reliability in unattended equipment such as remote sensors or utility meters |
| Endurance | 1 million erase/write cycles, suitable for applications logging periodic events (e.g., energy meter pulse counts) |
Pinout & Package
25C320T/SN is supplied in an 8-lead plastic SOIC (150 mil body) package, marked per Microchip's standard convention including part number, year/week code, and traceability identifier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select input | Active-low enable; deselects device and places SO in high-impedance state to share SPI bus with multiple peripherals |
| SO (Pin 2) | Serial Output | Provides read data on falling edge of SCK; tri-stated when CS high or HOLD low |
| WP (Pin 3) | Write-Protect input | Hardware lock for STATUS register when WPEN = 1; no effect on memory writes unless enabled in STATUS register |
| VSS (Pin 4) | Ground | Reference return path for all digital and internal charge-pump circuits |
| SI (Pin 5) | Serial Input | Receives instructions, addresses, and data on rising edge of SCK |
| SCK (Pin 6) | Serial Clock | Synchronizes all SPI transactions; rising edge latches SI, falling edge updates SO |
| HOLD (Pin 7) | Hold input | Suspends ongoing SPI sequence (e.g., during MCU interrupt servicing); requires SCK low to activate |
| VCC (Pin 8) | Supply voltage | 4.5–5.5 V operation; powers internal logic, EEPROM array, and HV generator for write/erase |
Key Features
| Feature | Design Value |
|---|---|
| Page write (32 bytes) | Reduces write overhead vs. byte-write; enables efficient storage of sensor logs or configuration blocks without external buffering |
| Hardware write protection | Prevents accidental overwrites of critical settings (e.g., calibration coefficients) using dedicated WP pin and STATUS-configurable enable |
| Self-timed write cycles | Eliminates need for external timeout management; WIP bit in STATUS register allows polling instead of fixed delays |
| Industrial & automotive temp range | Rated for −40°C to +125°C (E grade), supporting deployment in engine control units, motor drives, and outdoor infrastructure |
| Low standby current (500 nA) | Minimizes battery drain in always-on backup systems, such as real-time clock supervision or tamper-detection circuits |
Applications
| Industrial Control Panel | Automotive Engine Control Unit |
|---|---|
Use Scenario: Storing user-defined setpoints, alarm thresholds, and operational history in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed via SPI during boot and runtime parameter updates. Use Value: Ensures consistent behavior after power loss; 1M endurance supports daily recalibration over 10+ years. | Use Scenario: Retaining adaptive fuel trim values and diagnostic trouble codes (DTCs) in ECU modules. IC Role / Device Role / Timing Role: SPI-connected EEPROM for persistent data logging under harsh thermal and EMI conditions. Use Value: −40°C to +125°C rating and 4 kV ESD protection ensure reliability in under-hood environments. |
| Smart Energy Meter | Medical Infusion Pump |
Use Scenario: Recording cumulative kWh usage, tariff schedules, and firmware update metadata across decades of service. IC Role / Device Role / Timing Role: Long-life data archive interfaced to metering SoC via dedicated SPI port. Use Value: >200-year data retention eliminates field replacement risk; 5 ms write time aligns with anti-tamper event capture windows. | Use Scenario: Storing drug library profiles, dosage limits, and audit trails compliant with IEC 62304 safety requirements. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory for configuration and event logging, isolated from main processor bus. Use Value: Hardware write protection prevents unauthorized modification of therapeutic parameters during operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC320T/SN | 2.5–5.5 V VCC range; 2 MHz max clock; rated for −40°C to +125°C (E) and −40°C to +85°C (I) | Better suited for mixed-voltage systems (e.g., 3.3 V MCU with 5 V peripherals); lower speed margin acceptable in low-bandwidth logging | Select when wider supply flexibility is needed and 3 MHz is not required. |
| 25AA320T/SN | 1.8–5.5 V VCC range; 1 MHz max clock; rated for −40°C to +85°C (I) only | Optimized for ultra-low-power battery-operated devices; lacks automotive temperature qualification | Select for cost-sensitive consumer or portable equipment where extended temperature range is unnecessary. |
Compared with 25C320T/SN, 25LC320T/SN offers broader VCC tolerance but reduced speed, while 25AA320T/SN enables 1.8 V operation at the expense of automotive qualification and clock performance - making 25C320T/SN optimal for legacy 5 V industrial and automotive designs demanding maximum throughput and extended temperature resilience.
Availability
25C320T/SN is available at Aetrix Electronics and suitable for industrial control panels, automotive engine control units, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for 25C320T/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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25C320T/SN belongs to Microchip's legacy SPI Serial EEPROM product line, engineered specifically for robust, low-pin-count nonvolatile storage in 5 V industrial and automotive systems where reliability and long-term data integrity are critical.
FAQ
What is the operating voltage range for the 25C320T/SN?
The 25C320T/SN operates within a strict 4.5 V to 5.5 V supply range. This 5 V-centric specification ensures compatibility with legacy industrial and automotive power domains, and excludes operation below 4.5 V - unlike the 25AA320 or 25LC320 variants. The 25C320T/SN must be powered within this window to guarantee correct SPI timing, write verification, and STATUS register functionality.
Does the 25C320T/SN support hardware write protection?
Yes, the 25C320T/SN supports hardware write protection via its WP pin, but only when the WPEN bit in the STATUS register is set to 1. When enabled, a low WP signal blocks writes to nonvolatile STATUS bits (BP0, BP1, WPEN), while memory array writes remain unaffected unless block protection bits are also configured. This dual-layer control allows secure calibration storage without disabling full memory access.
What package type is used for the 25C320T/SN?
The 25C320T/SN is packaged in an 8-lead plastic SOIC (150 mil body), designated by the "SN" suffix per Microchip's part numbering system. This surface-mount package has standard 1.27 mm lead pitch and is compatible with automated PCB assembly processes. The "T" suffix indicates tape-and-reel packaging for pick-and-place manufacturing.
How many write/erase cycles does the 25C320T/SN guarantee?
The 25C320T/SN guarantees 1 million write/erase cycles per memory location, as characterized and documented in Microchip's DS21227F datasheet. This endurance rating applies across the full temperature range (−40°C to +125°C) and supports applications requiring frequent updates - such as event counters or runtime configuration logging - with projected service life exceeding 10 years at daily write rates.
Can the 25C320T/SN be used in automotive applications?
Yes, the 25C320T/SN is qualified for automotive applications under the "E" temperature grade (−40°C to +125°C), as confirmed in the Device Selection Table of DS21227F. It meets AEC-Q100 stress test requirements for ambient temperature, ESD (>4 kV HBM), and reliability. Its 5 V operation and 3 MHz SPI interface make it suitable for engine control, body electronics, and ADAS subsystems where legacy 5 V infrastructure remains prevalent.
25C320T/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25C320T/SN FAQ
1.How can I place an order for 25C320T/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25C320T/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 25C320T/SN reliable?
The price and inventory of 25C320T/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25C320T/SN is usually 5 days.
3.What payment methods are accepted for 25C320T/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25C320T/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25C320T/SN?
25C320T/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25C320T/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 25C320T/SN?
For technical support, including 25C320T/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25C320T/SN requirements.
6.How does Aetrix verify that 25C320T/SN is sourced from the original manufacturer or authorized distributors?
All 25C320T/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 25C320T/SN meets industry standards.
7.What is the process for return or replacement of 25C320T/SN?
All 25C320T/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25C320T/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 25C320T/SN part is unused and in its original packaging.
Return procedure for 25C320T/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25C320T/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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AT24C08C-STUM-T
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