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Microchip Technology 25C320T-E/SN
- Part No.:
- 25C320T-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25C320T-E/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
25C320T-E/SN from Microchip Technology Inc. is a 32 Kbit SPI serial EEPROM IC designed for nonvolatile data storage in embedded control systems. It features 4096 × 8-bit organization, 3 MHz max clock frequency at 4.5–5.5 V, 5 ms max write cycle time, and industrial/automotive temperature support (−40°C to +125°C). It operates as a slave device on SPI buses in microcontroller-based instrumentation and power management modules.
For engineers reviewing the 25C320T-E/SN datasheet, 25C320T-E/SN pinout, 25C320T-E/SN application, or 25C320T-E/SN equivalent, key selection criteria include its 5V-only supply range, automotive-grade thermal rating, page-write capability (32-byte pages), hardware write protection via WP pin, and HOLD functionality for interrupt-safe serial communication.
Technical Context
The 25C320T-E/SN implements a standard SPI Mode 0,0 interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, and optional HOLD/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.
It supports sequential read, byte/page write, and status register access using fixed 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE, 0x01 for WRSR). Write operations require explicit WREN instruction and CS high-to-low transition to initiate self-timed erase-and-write cycles, with no external timing components needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4096 × 8-bit array), sufficient for firmware parameter tables or calibration data in resource-constrained systems |
| Supply voltage | 4.5–5.5 V only - requires stable 5V rail; incompatible with 3.3V or mixed-voltage SPI buses without level translation |
| Max clock frequency | 3 MHz at VCC = 4.5–5.5 V - enables ~384 KB/s theoretical read throughput, suitable for fast configuration loading |
| Write cycle time | 5 ms maximum - determines minimum latency between write commands; impacts real-time logging responsiveness |
| Endurance & retention | 1 million write/erase cycles and >200 years data retention - validated for long-life industrial logging and metering applications |
| Temperature range | −40°C to +125°C (Automotive E grade) - qualified for under-hood or power-conversion environments |
| Page size | 32 bytes - constrains burst write length; crossing page boundaries requires multiple write cycles |
Pinout & Package
25C320T-E/SN is supplied in an 8-lead plastic SOIC package (150 mil width), RoHS-compliant, tape-and-reel format (E/SN suffix denotes Automotive temp grade in SOIC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select input | Active-low enable; must be held low for entire SPI transaction; high-Z SO output when deasserted enables bus sharing |
| SO (Pin 2) | Serial Output | Data-out line; outputs memory contents on falling edge of SCK; tri-states during HOLD or when CS high |
| WP (Pin 3) | Write-Protect input | Hardware lock for STATUS register when WPEN=1; grounded to prevent accidental writes to protection bits |
| VSS (Pin 4) | Ground | Reference return for all I/O and core logic; requires low-impedance connection to system GND plane |
| SI (Pin 5) | Serial Input | Data-in line; latches instructions, addresses, and write data on rising edge of SCK |
| SCK (Pin 6) | Serial Clock | Master-generated clock; synchronizes all SPI transfers; rise/fall times ≤2 μs required for 3 MHz operation |
| HOLD (Pin 7) | Hold input | Pauses ongoing SPI sequence without reset; must be asserted while SCK is low to avoid metastability |
| VCC (Pin 8) | Supply voltage | 5V-only power input; bypass capacitor (0.1 μF ceramic) required near pin for noise immunity during write cycles |
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 full array - enables secure boot code partitioning |
| Hardware write protection | WP pin + WPEN bit combination prevents STATUS register modification even during power glitches - critical for field-upgrade safety |
| HOLD function | Interrupt-safe pause/resume of SPI transfers without retransmission - allows host MCU to service higher-priority tasks mid-sequence |
| Low-power standby | 500 nA typical ICCS at VCC = 5.5 V - extends battery life in always-on sensor nodes or backup memory circuits |
| ESD robustness | 4 kV HBM protection on all pins - reduces need for external TVS diodes in industrial I/O modules |
Applications
| Industrial Sensor Calibration | Automotive Powertrain Control |
|---|---|
Use Scenario: Storing factory-calibrated ADC offset/gain coefficients and temperature compensation tables in programmable sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during power-up initialization; read-only during runtime. Use Value: Enables single-device calibration across production batches without firmware changes; 200-year retention ensures lifetime accuracy. | Use Scenario: Holding adaptive learning values (e.g., idle air control trim, fuel injector latency offsets) in engine control units (ECUs). IC Role / Device Role / Timing Role: Write-once-per-drive-cycle data logger with HOLD support to avoid corruption during CAN bus interrupts. Use Value: −40°C to +125°C rating matches under-hood thermal profile; 1M endurance supports >10 years of daily updates. |
| Smart Energy Metering | Medical Diagnostic Equipment |
Use Scenario: Recording tamper events, billing cycle timestamps, and tariff schedule parameters in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Secure, write-protected event log with BP1/BP0 locking critical registers against firmware bugs. Use Value: Hardware WP pin prevents malicious or accidental overwrites of revenue-critical data; 5 ms write time aligns with metering interrupt windows. | Use Scenario: Storing FDA-mandated device configuration history, calibration logs, and user audit trails in portable ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: Certified nonvolatile memory for regulatory traceability; accessed via isolated SPI interface. Use Value: Automotive-grade temperature range exceeds medical environmental specs; 4 kV ESD protects against handling discharge in clinical settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC320T-E/SN | 2.5–5.5 V supply range; 2 MHz max clock; same pinout and instruction set | Supports mixed 3.3V/5V systems; lower speed acceptable for slower control loops | Select when board uses 3.3V logic or shared 5V/3.3V SPI bus |
| 25AA320T-I/SN | 1.8–5.5 V supply; 1 MHz max clock; industrial (−40°C to +85°C) grade only | Enables ultra-low-power sleep modes; insufficient for automotive under-hood use | Select for battery-powered IoT endpoints where 5V supply is unavailable |
Compared with 25C320T-E/SN, 25LC320T-E/SN offers broader voltage compatibility but reduced speed, while 25AA320T-I/SN enables lower-voltage operation at the cost of automotive qualification - choose 25C320T-E/SN strictly for 5V, high-temp, high-speed EEPROM needs.
Availability
25C320T-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive powertrain control, smart energy metering, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25C320T-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25C320T-E/SN belongs to Microchip's legacy SPI EEPROM product line, engineered specifically for reliable, low-pin-count nonvolatile storage in 5V industrial and automotive systems where deterministic write timing and hardware-level data protection are mandatory.
FAQ
What is the operating voltage range for the 25C320T-E/SN?
The 25C320T-E/SN operates exclusively within 4.5 V to 5.5 V. It is not functional below 4.5 V and must not be exposed to voltages exceeding 5.5 V during normal operation. This strict 5V-only range differentiates it from the 25LC320 (2.5–5.5 V) and 25AA320 (1.8–5.5 V) variants. Designers must ensure clean, regulated 5V supply with appropriate decoupling.
Does the 25C320T-E/SN support SPI Mode 3 (CPOL=1, CPHA=1)?
No, the 25C320T-E/SN supports only SPI Mode 0,0 (CPOL=0, CPHA=0), where data is sampled on the rising edge of SCK and output on the falling edge. Its timing diagrams and instruction protocol are defined for this mode exclusively. Attempting Mode 3 will result in misaligned data sampling and communication failure.
How does the HOLD function behave during an active write cycle in the 25C320T-E/SN?
The HOLD function is disabled during an internal write cycle in the 25C320T-E/SN. Once a write is initiated (CS high after final data bit), the device ignores HOLD transitions until the 5 ms self-timed cycle completes. HOLD only operates during active SPI transactions (read/write command phases), not during background programming.
Can the 25C320T-E/SN be used as a direct replacement for the 25LC320T-E/SN on the same PCB?
No - although both share identical SOIC-8 packaging and pinout, the 25C320T-E/SN requires minimum 4.5 V supply, whereas the 25LC320T-E/SN functions down to 2.5 V. Substituting without verifying system rail stability risks undervoltage reset or communication failure. Electrical compatibility is not guaranteed despite mechanical equivalence.
What protection mechanisms prevent accidental writes to the 25C320T-E/SN memory array?
The 25C320T-E/SN employs four layered protections: (1) power-on reset clears the write-enable latch; (2) explicit WREN instruction required before each write; (3) automatic WEL reset after every successful write or WRDI; and (4) hardware WP pin + WPEN bit that disables STATUS register writes when grounded. All operate independently to ensure data integrity.
25C320T-E/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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25C320T-E/SN FAQ
1.How can I place an order for 25C320T-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25C320T-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 25C320T-E/SN reliable?
The price and inventory of 25C320T-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 25C320T-E/SN is usually 5 days.
3.What payment methods are accepted for 25C320T-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25C320T-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25C320T-E/SN?
25C320T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25C320T-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 25C320T-E/SN?
For technical support, including 25C320T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25C320T-E/SN requirements.
6.How does Aetrix verify that 25C320T-E/SN is sourced from the original manufacturer or authorized distributors?
All 25C320T-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 25C320T-E/SN meets industry standards.
7.What is the process for return or replacement of 25C320T-E/SN?
All 25C320T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25C320T-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 25C320T-E/SN part is unused and in its original packaging.
Return procedure for 25C320T-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25C320T-E/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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