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Microchip Technology 25C320/P
- Part No.:
- 25C320/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
25C320/P.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,268
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Product details
Overview
25C320/P from Microchip Technology Inc. is a 32 Kbit SPI serial EEPROM designed for nonvolatile data storage in embedded control systems. It features 4096 × 8-bit organization, 32-byte page write capability, 5 ms maximum internal write cycle time, and operates at 3 MHz clock frequency with VCC = 4.5–5.5 V. It is used in industrial temperature range (–40°C to +85°C) applications requiring reliable parameter retention across power cycles.
For engineers reviewing the 25C320/P datasheet, 25C320/P pinout, 25C320/P application, or 25C320/P equivalent, this page delivers verified electrical specs, SPI interface timing constraints, hardware write-protection behavior, endurance/reliability metrics, and validated alternative parts for design continuity.
Technical Context
The 25C320/P implements a standard SPI Mode 0,0 (CPOL = 0, CPHA = 0) interface with separate SI (data-in) and SO (data-out) lines, CS-controlled selection, and HOLD pin for transaction suspension. Its memory array is organized as 4096 bytes with automatic address rollover during sequential reads.
It integrates on-chip high-voltage generation for EEPROM programming, self-timed erase/write cycles, and a STATUS register with WIP, WEL, BP0/BP1, and WPEN bits. Block protection supports none, upper 1/4, upper 1/2, or full-array write lock via BP0/BP1 configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit), enabling storage of firmware parameters or calibration data in compact microcontroller systems |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO, HOLD, and WP signals - no parallel bus overhead |
| Max Clock Frequency | 3 MHz at VCC = 4.5–5.5 V, supporting fast read/write transfers up to 3 MB/s theoretical throughput |
| Write Cycle Time | 5 ms maximum internal write time per page or byte, defining minimum delay before status polling or next command |
| Endurance & Retention | 1 million write/erase cycles and >200 years data retention, suitable for long-life industrial logging and configuration storage |
| VCC Range | 4.5 V to 5.5 V, matching legacy 5 V logic systems and eliminating level-shifting requirements |
| Temp Range | Industrial grade: –40°C to +85°C, qualified for use in motor controls, PLC I/O modules, and power supply monitors |
Pinout & Package
25C320/P is supplied in an 8-pin Plastic DIP (300 mil) package with through-hole mounting. Pin functions are electrically identical to SOIC and TSSOP variants but physically adapted for prototyping and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: pulls device out of standby; rising edge after write sequence initiates internal write cycle |
| SO (Pin 2) | Serial Data Output | Tri-states when CS high or HOLD low; outputs data on falling SCK edge during read operations |
| WP (Pin 3) | Write-Protect Input | Hardware lock: disables STATUS register writes when WPEN = 1 and WP = low; otherwise ignored |
| VSS (Pin 4) | Ground Reference | Return path for all internal circuitry and I/O drivers; must be low-impedance connection to system GND |
| SI (Pin 5) | Serial Data Input | Latches instruction, address, and data on rising SCK edge; accepts MSB-first SPI framing |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transactions; rising edge clocks data in, falling edge clocks data out |
| HOLD (Pin 7) | Transaction Pause Control | Halts ongoing SPI transfer without resetting state; requires SCK low before assertion and release |
| VCC (Pin 8) | Supply Voltage | 4.5–5.5 V DC input powering EEPROM core, logic, and HV generator; bypass capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Capability | 32-byte page buffer enables burst writes within same 32-byte boundary, reducing total write cycles by up to 32× vs. byte-wise writes |
| Hardware Write Protection | WP pin + WPEN bit combination provides physical lock against accidental STATUS register corruption in field-deployed units |
| Low-Power Operation | 500 nA typical standby current and 3 mA max write current allow integration into battery-backed or energy-constrained systems |
| HOLD Functionality | Enables host MCU to service higher-priority interrupts mid-transaction without losing SPI context or reinitializing communication |
| Block Protection Flexibility | BP0/BP1 bits support four protection modes (none, 1/4, 1/2, full array), permitting selective locking of calibration or security sectors |
Applications
| Industrial Motor Control | Power Supply Monitoring |
|---|---|
|
Use Scenario: Storing motor calibration coefficients, fault history logs, and runtime configuration parameters across power cycles. IC Role / Device Role: Nonvolatile parameter store interfaced directly to PIC16 or dsPIC33 microcontrollers via SPI. Use Value: Enables deterministic startup behavior and field-updatable tuning without external FRAM or battery-backed SRAM. |
Use Scenario: Recording overvoltage/overcurrent event timestamps, thermal derating thresholds, and factory-set safety limits. IC Role / Device Role: Fault-logging EEPROM co-located with digital power controller ICs like UCD3138. Use Value: Survives repeated brownouts and maintains traceable operational history for compliance reporting. |
| Medical Diagnostic Equipment | Automotive Body Control Module |
|
Use Scenario: Holding user preferences, sensor offset corrections, and regulatory audit trails in portable ultrasound or ECG devices. IC Role / Device Role: Secure configuration storage with hardware write-protection enabled during normal operation. Use Value: Prevents unauthorized modification of clinical settings while allowing safe field updates via authenticated service mode. |
Use Scenario: Storing door lock actuator calibration, window position learning data, and lighting profile preferences. IC Role / Device Role: SPI-connected EEPROM interfaced to Infineon AURIX TC2xx or NXP S32K microcontrollers. Use Value: Maintains personalized settings across vehicle battery disconnects and meets AEC-Q100 Class 2 reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA320-I/P | 1.8–5.5 V VCC, 1 MHz max clock, wider voltage range and lower speed; same pinout and instruction set | Supports mixed-voltage systems (e.g., 3.3 V MCU with 5 V peripherals); less suitable for high-speed 5 V-only designs | Select when system VCC varies below 4.5 V or when interoperability with 3.3 V logic is required |
| AT25DF321A-SSH-T | 32 Mbit density, quad SPI interface, 85 MHz clock, different command set and sector protection model | Targeted at firmware code storage (XIP-capable), not parameter storage; requires driver rewrite and layout changes | Consider only for new designs needing larger capacity and faster access; not drop-in compatible with 25C320/P |
Compared with 25C320/P, 25AA320-I/P offers broader supply flexibility at reduced speed, while AT25DF321A-SSH-T provides higher density and performance at the cost of software and hardware redesign - neither is pin-compatible, but both serve overlapping system-level storage roles.
Availability
25C320/P is available at Aetrix Electronics and suitable for industrial motor control, power supply monitoring, medical diagnostics, and automotive body electronics requiring stable component supply and long-term lifecycle assurance.
Supply support for 25C320/P 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/P belongs to Microchip's legacy 25XX320 serial EEPROM family, engineered for robust, low-power, SPI-based nonvolatile storage in cost-sensitive industrial and automotive control applications.
FAQ
What is the operating voltage range for the 25C320/P?
The 25C320/P 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 - applying 3.3 V will result in undefined behavior or failure to respond to SPI commands. This makes it ideal for legacy 5 V systems where voltage margin is guaranteed.
Does the 25C320/P support page write operations?
Yes, the 25C320/P supports 32-byte page writes. The internal page buffer allows up to 32 consecutive bytes to be loaded before initiating the 5 ms internal write cycle. Crossing a 32-byte page boundary during a write sequence causes wraparound and unintended overwrites - proper address alignment is required in firmware.
How does hardware write protection work on the 25C320/P?
Hardware write protection on the 25C320/P activates only when both the WP pin is held low AND the WPEN bit in the STATUS register is set to 1. When active, it prevents writes to nonvolatile STATUS bits (BP0, BP1, WPEN) but allows normal memory reads and writes. If WPEN = 0, the WP pin has no effect.
What is the maximum SPI clock frequency supported by the 25C320/P?
The 25C320/P supports up to 3 MHz SPI clock frequency when powered at 4.5–5.5 V. This is its highest-rated speed grade among the 25XX320 family. At this rate, byte reads complete in ~3.3 µs (11 SCK cycles), and page writes require host-side timing coordination due to the 5 ms internal write latency.
Is the 25C320/P still recommended for new designs?
No - Microchip explicitly marks the 25C320/P as "Not recommended for new designs" in DS21227F. The 25AA320A or 25LC320A are preferred replacements offering improved ESD tolerance, tighter AC specs, and extended lifecycle support. However, the 25C320/P remains fully supported for existing production and repair programs.
25C320/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
25C320/P FAQ
1.How can I place an order for 25C320/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 25C320/P 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/P reliable?
The price and inventory of 25C320/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25C320/P is usually 5 days.
3.What payment methods are accepted for 25C320/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25C320/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25C320/P?
25C320/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25C320/P 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/P?
For technical support, including 25C320/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25C320/P requirements.
6.How does Aetrix verify that 25C320/P is sourced from the original manufacturer or authorized distributors?
All 25C320/P 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/P meets industry standards.
7.What is the process for return or replacement of 25C320/P?
All 25C320/P units undergo pre-shipment inspection (PSI). If there is an issue with 25C320/P, 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/P part is unused and in its original packaging.
Return procedure for 25C320/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25C320/P 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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AT24C02C-SSHM-T
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24LC01BT-I/OT
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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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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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