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Microchip Technology 25LC320T/SN
- Part No.:
- 25LC320T/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC320T/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 2MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,793
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Product details
Overview
25LC320T/SN from Microchip Technology is a 32 Kbit (4096 × 8) SPI serial EEPROM with 2.5–5.5 V supply, 2 MHz max clock, industrial temperature range (−40°C to +85°C), and 8-pin SOIC package. It features 32-byte page write, 5 ms max internal write cycle time, and hardware write protection via WP pin and STATUS register.
For engineers reviewing the 25LC320T/SN datasheet, 25LC320T/SN pinout, 25LC320T/SN application, or 25LC320T/SN equivalent, key selection considerations include VCC compatibility (2.5–5.5 V), SPI timing compliance at 2 MHz, page-write buffer constraints, HOLD functionality for interrupt-safe operation, and block-protection granularity (none/¼/½/all array).
Technical Context
The 25LC320T/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-driven pause/resume capability. Its internal architecture includes an 8-bit instruction register, auto-incrementing address pointer, and nonvolatile STATUS register with WIP, WEL, BP0/BP1, and WPEN bits.
Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed erase-and-write cycles. Block protection is configurable via BP0/BP1 bits to lock 0%, 25%, 50%, or 100% of the 4096-byte array, while hardware write protection engages only when WP is low *and* WPEN is set high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4096 × 8) - supports firmware storage, calibration data, or configuration parameters in space-constrained embedded systems |
| VCC range | 2.5–5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting |
| Max clock frequency | 2 MHz - enables fast read/write transfers up to 2 Mbit/s in systems with moderate-speed SPI peripherals |
| Page size | 32 bytes - limits burst writes to single-page boundaries; crossing pages requires multiple write cycles |
| Write cycle time | 5 ms maximum - defines worst-case latency for persistent data commits; impacts real-time logging responsiveness |
| Endurance | 1 million erase/write cycles - supports long-term field deployment in metering or control applications with frequent updates |
| Data retention | >200 years - ensures integrity of stored calibration or security keys over product lifetime |
Pinout & Package
25LC320T/SN uses an 8-pin plastic SOIC (150 mil) package with standard pinout: Pin 1 = CS, Pin 2 = SO, Pin 3 = WP, Pin 4 = VSS, Pin 5 = SI, Pin 6 = SCK, Pin 7 = HOLD, Pin 8 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; places SO in high-impedance state when deasserted, enabling multi-device SPI bus sharing |
| SO | Serial Output | Tri-state output; data shifted out on falling edge of SCK; high-Z when CS high or HOLD active |
| WP | Write-Protect input | Hardware lock for STATUS register nonvolatile bits when WPEN = 1; no effect if WPEN = 0 |
| SI | Serial Input | Data, addresses, and instructions latched on rising edge of SCK; MSB-first protocol |
| SCK | Serial Clock | Synchronizes all SPI transfers; rising edge clocks SI, falling edge updates SO |
| HOLD | Hold input | Pauses ongoing SPI sequence without reset; requires SCK low before assertion; tri-states SO during hold |
| VSS | Ground | Reference return path for all I/O and core circuitry; must be low-impedance connection |
| VCC | Supply voltage | Power source for EEPROM core and I/O buffers; bypass capacitor required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed write cycles | Eliminates need for external timing control; internal 5 ms timeout ensures reliable programming regardless of host timing margins |
| Block write protection | Configurable via STATUS register BP0/BP1 bits to protect 0%, 25%, 50%, or 100% of memory - prevents accidental overwrite of critical firmware or calibration data |
| HOLD function | Enables host CPU to service higher-priority interrupts mid-transfer without losing SPI context or reinitializing communication |
| Low-power operation | 500 nA typical standby current and 3 mA max write current support battery-powered or energy-harvesting applications |
| ESD robustness | >4000 V HBM rating protects against handling damage and system-level ESD events in industrial environments |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during power-up initialization and runtime correction routines. Use Value: Enables field-replaceable sensors without recalibration; 1M endurance supports periodic recalibration updates over 10+ years. |
Use Scenario: Holding user-configurable therapy parameters (e.g., dose rate, duration, alarm thresholds) in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store with hardware write protection to prevent unauthorized changes. Use Value: WP pin + WPEN bit blocks unintended writes during operation; >200-year data retention guarantees settings persist across device lifetime. |
| Smart Energy Meter Firmware | Automotive Body Control Module |
|
Use Scenario: Storing firmware update staging area and cryptographic keys for secure OTA updates in residential electricity meters. IC Role / Device Role / Timing Role: Dedicated SPI EEPROM interfaced to metering SoC for isolated code/data storage. Use Value: 2 MHz SPI speed allows rapid key loading; 32-byte page writes optimize flash update packet handling without excessive overhead. |
Use Scenario: Saving seat/mirror position presets and lighting profiles in vehicle body control units operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable nonvolatile memory for user preference storage with guaranteed operation at automotive extremes. Use Value: Industrial-grade temp range (−40°C to +85°C) and 500 nA standby current minimize parasitic drain on vehicle battery during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA320T/SN | Wider VCC range (1.8–5.5 V); 1 MHz max clock; same 32 Kbit density and SOIC-8 package | Better suited for 1.8 V or mixed-voltage systems; lower speed acceptable where throughput not critical | Select when operating below 2.5 V or requiring broader supply flexibility over speed |
| 25LC320T-ST | Identical electrical specs but 8-pin TSSOP package (4.4 mm width vs. SOIC's 3.9 mm) | Requires PCB footprint change; preferred for high-density layouts where SOIC pitch is insufficient | Choose for space-constrained designs needing smaller footprint; verify thermal derating in enclosed enclosures |
Compared with 25LC320T/SN, 25AA320T/SN offers lower-voltage operation at reduced speed, while 25LC320T-ST provides identical performance in a physically smaller package - both serve distinct mechanical or supply-domain requirements without functional compromise.
Availability
25LC320T/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart energy meter firmware, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for 25LC320T/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 microcontroller, analog, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with high-reliability silicon and development tools.
The 25LC320T/SN belongs to Microchip's legacy SPI Serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring robust nonvolatile storage with simple interface requirements.
FAQ
What is the supply voltage range supported by the 25LC320T/SN?
The 25LC320T/SN operates from 2.5 V to 5.5 V. This range ensures compatibility with common 3.3 V and 5 V logic systems without external level shifters. Operation below 2.5 V is not guaranteed - for 1.8 V systems, consider the 25AA320T/SN variant instead. The 25LC320T/SN datasheet specifies DC characteristics only within this 2.5–5.5 V window.
How does the HOLD pin function during SPI communication for the 25LC320T/SN?
The HOLD pin on the 25LC320T/SN suspends ongoing SPI transfers without resetting the sequence. When pulled low while SCK is low, it tri-states SO, SI, and SCK inputs are ignored except CS. Communication resumes when HOLD returns high with SCK low. This allows the host MCU to service interrupts mid-transfer - a critical feature in real-time embedded systems using the 25LC320T/SN.
Can the 25LC320T/SN be used for secure storage of cryptographic keys?
The 25LC320T/SN supports hardware write protection via the WP pin and STATUS register's WPEN bit, which can lock nonvolatile bits including BP0/BP1. While it lacks dedicated security features like encryption or secure boot, its 1M endurance, >200-year data retention, and configurable block protection make it suitable for storing static keys in cost-sensitive applications where physical access control is enforced - consistent with 25LC320T/SN design intent.
What is the maximum clock frequency the 25LC320T/SN supports, and under what conditions?
The 25LC320T/SN supports up to 2 MHz maximum clock frequency when VCC is between 2.5 V and 5.5 V. This rating applies across the full industrial temperature range (−40°C to +85°C). At 5.5 V, AC timing parameters such as TCSS (CS setup) and TSU (data setup) tighten to 100 ns minimum, enabling reliable high-speed operation - a key specification distinguishing 25LC320T/SN from the 1 MHz 25AA320T/SN.
Does the 25LC320T/SN support page write operations, and what is the page size?
Yes, the 25LC320T/SN supports page write operations with a fixed 32-byte page size. Up to 32 bytes can be loaded into the write buffer before triggering an internal write cycle. Writes crossing page boundaries automatically roll over to the start of the same page, potentially overwriting earlier data - so software must enforce page alignment. This behavior is explicitly defined in the 25LC320T/SN functional description and affects firmware update logic design.
25LC320T/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:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC320T/SN FAQ
1.How can I place an order for 25LC320T/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320T/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 25LC320T/SN reliable?
The price and inventory of 25LC320T/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC320T/SN is usually 5 days.
3.What payment methods are accepted for 25LC320T/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320T/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320T/SN?
25LC320T/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320T/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 25LC320T/SN?
For technical support, including 25LC320T/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320T/SN requirements.
6.How does Aetrix verify that 25LC320T/SN is sourced from the original manufacturer or authorized distributors?
All 25LC320T/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 25LC320T/SN meets industry standards.
7.What is the process for return or replacement of 25LC320T/SN?
All 25LC320T/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320T/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 25LC320T/SN part is unused and in its original packaging.
Return procedure for 25LC320T/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25LC320T/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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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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