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Microchip Technology 25LC320T-E/SN
- Part No.:
- 25LC320T-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC320T-E/SN.pdf
- Description:
- IC EEPROM 32KBIT SPI 2MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
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Product details
Overview
25LC320T-E/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, 2 MHz max clock frequency at 2.5–5.5 V, and industrial/automotive temperature support (−40°C to +125°C). It is used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 25LC320T-E/SN datasheet, 25LC320T-E/SN pinout, 25LC320T-E/SN application, or 25LC320T-E/SN equivalent, key selection considerations include VCC range (2.5–5.5 V), HOLD/ WP pin functionality, 5 ms max write cycle time, block protection granularity (1/4, 1/2, or full array), and SOIC-8 package compatibility with SPI bus timing constraints.
Technical Context
The 25LC320T-E/SN implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and hardware-assisted HOLD suspension. Its internal architecture includes an 8-bit instruction register, STATUS register with WIP/WEL/BP0/BP1 bits, and high-voltage generator for EEPROM programming.
It supports sequential read, byte/page write, and status register access via dedicated opcodes (0x03, 0x02, 0x05, 0x01). Write protection is enforced through dual-layer control: software-configurable BP0/BP1 bits plus hardware WP pin gating enabled by WPEN bit - both nonvolatile and independently configurable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4096 × 8) - provides sufficient space for boot configuration, device ID, calibration coefficients, or small firmware patches. |
| Interface | SPI-compatible serial bus (Mode 0,0) - enables direct connection to MCU SPI peripherals without GPIO bit-banging overhead. |
| Max clock frequency | 2 MHz at VCC = 2.5–5.5 V - supports fast read/write in power-constrained industrial nodes while maintaining timing margin. |
| Write cycle time | 5 ms maximum - defines minimum interval between write commands; impacts real-time logging latency and system responsiveness. |
| Endurance & retention | 1 million erase/write cycles, >200 years data retention - ensures long-term reliability in infrequently updated but mission-critical storage applications. |
| Supply voltage | 2.5 V to 5.5 V - compatible with 3.3 V logic systems and legacy 5 V designs, simplifying voltage domain integration. |
| Operating temperature | −40°C to +125°C (Automotive E grade) - qualified for under-hood, motor control, and industrial PLC environments. |
Pinout & Package
25LC320T-E/SN is packaged in an 8-pin plastic SOIC (150 mil body), designated SN per Microchip's part numbering system. The package is RoHS-compliant, surface-mountable, and optimized for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable: selects device for SPI communication; forces SO into high-impedance when deasserted, enabling bus sharing. |
| SO | Serial Output | Data output line: shifts memory contents MSB-first on falling edge of SCK during READ; tri-stated when CS high or HOLD low. |
| WP | Write-Protect input | Hardware lock: disables STATUS register writes when WP = low and WPEN = 1; otherwise allows full register access. |
| VSS | Ground | Reference return path for all digital and internal charge-pump circuits; must be low-impedance for reliable write operation. |
| SI | Serial Input | Data/command input: latches instructions, addresses, and write data on rising edge of SCK; requires setup/hold timing compliance. |
| SCK | Serial Clock | Synchronization signal: controls data sampling (SI) and output timing (SO); max 2 MHz rate defines throughput ceiling. |
| HOLD | Hold input | Bus pause control: suspends ongoing SPI transaction without reset; requires SCK = low before assertion to avoid metastability. |
| VCC | Supply voltage | Power input: 2.5–5.5 V operation enables use across mixed-voltage systems; internal regulation supports EEPROM programming. |
Key Features
| Feature | Design Value |
|---|---|
| Block write protection | Selectable 0%, 25%, 50%, or 100% array protection via BP0/BP1 bits - prevents accidental overwrite of critical firmware or calibration zones. |
| Hardware write protection | WP pin + WPEN bit dual-gating - allows physical lockout of STATUS register writes while permitting memory reads and unprotected writes. |
| Self-timed write cycles | No external timing control needed; internal state machine manages erase/write/verify - simplifies host firmware and eliminates timeout tuning. |
| HOLD function | Pauses active SPI sequence mid-transfer; preserves address pointer and command state - enables interrupt servicing without reinitialization. |
| Low-power operation | 500 nA typical standby current and 3 mA max write current - extends battery life in portable or energy-harvesting sensor nodes. |
Applications
| Industrial Sensor Node | Automotive ECUs |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offsets and temperature compensation coefficients in a wireless pressure transducer. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during power-up and runtime recalibration; SPI interface synchronized to MCU clock. Use Value: Ensures measurement accuracy over lifetime and temperature range; 1M endurance supports field recalibration cycles without replacement. |
Use Scenario: Retaining adaptive learning values (e.g., throttle position adaptation, idle air control trim) in engine control units. IC Role / Device Role / Timing Role: Automotive-grade EEPROM for safety-critical parameter persistence across ignition cycles; operates reliably at 125°C ambient. Use Value: Enables self-learning behavior without requiring external backup power; >200-year retention guarantees data integrity over vehicle lifetime. |
| Medical Diagnostic Device | Smart Energy Meter |
|
Use Scenario: Logging diagnostic fault codes and usage history in a portable ultrasound probe. IC Role / Device Role / Timing Role: Secure, tamper-resistant event logger with write-protection enabled for critical fault records. Use Value: Prevents accidental erasure of regulatory audit trails; WP pin grounding enforces immutable log segments during field service. |
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-detection timestamps in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: High-reliability data vault interfaced via isolated SPI; withstands repeated power cycling and grid transients. Use Value: Meets ANSI/IEEE data retention requirements; 5 ms write time enables rapid update during billing interval transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA320T-I/SN | Wider VCC range (1.8–5.5 V), 1 MHz max clock, Industrial temp only (−40°C to +85°C) | Better suited for battery-powered, low-voltage systems; not qualified for automotive under-hood use | Select when operating below 2.5 V or requiring broader supply flexibility; verify timing margins at lower clock rates. |
| 25LC320T-I/SN | Identical electrical specs and pinout, but rated only for Industrial temperature (−40°C to +85°C) | Lacks AEC-Q100 qualification and extended high-temp operation required for automotive ECU mounting locations | Choose for cost-sensitive industrial control panels where 125°C operation is unnecessary and automotive qualification is not mandated. |
Compared with 25LC320T-E/SN, the 25AA320T-I/SN offers lower-voltage operation at reduced speed, while the 25LC320T-I/SN matches performance but lacks automotive temperature qualification - making the E-grade version essential for under-hood or high-ambient deployments requiring guaranteed 125°C functionality.
Availability
25LC320T-E/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive electronic control units, medical diagnostic devices, and smart energy metering systems requiring stable component supply across extended product lifecycles.
Supply support for 25LC320T-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, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.
The 25LC320T-E/SN belongs to Microchip's SPI Serial EEPROM product line, engineered for robust nonvolatile storage in harsh environments - emphasizing endurance, data retention, and hardware-assisted write protection for mission-critical firmware and calibration data.
FAQ
What is the maximum clock frequency supported by the 25LC320T-E/SN?
The 25LC320T-E/SN supports a maximum SPI clock frequency of 2 MHz when operated within its specified VCC range of 2.5 V to 5.5 V. This rating applies across the full automotive temperature range (−40°C to +125°C). At lower supply voltages or outside this range, timing margins may degrade, so design validation under worst-case conditions is recommended for the 25LC320T-E/SN.
How does the HOLD pin function during an active SPI transaction on the 25LC320T-E/SN?
The HOLD pin on the 25LC320T-E/SN suspends an ongoing SPI sequence without resetting the internal address pointer or command state. To activate HOLD, it must be pulled low while SCK is low; doing so places SI, SCK, and SO in high-impedance states and ignores further input transitions until HOLD is returned high - also while SCK is low. This enables the host MCU to service higher-priority interrupts and resume exactly where it left off, preserving transaction integrity for the 25LC320T-E/SN.
What write protection options are available on the 25LC320T-E/SN?
The 25LC320T-E/SN provides two-tiered write protection: software-configurable block protection (BP0/BP1 bits) enabling 0%, 25%, 50%, or 100% array lockdown, and hardware-enforced STATUS register protection via the WP pin gated by the nonvolatile WPEN bit. When WP = low and WPEN = 1, writes to nonvolatile STATUS bits are blocked - allowing memory reads and unprotected writes while securing configuration integrity for the 25LC320T-E/SN.
Is the 25LC320T-E/SN pin-compatible with other members of the 25XX320 family?
Yes - the 25LC320T-E/SN uses the same 8-pin SOIC (SN) package and identical pinout as the 25AA320T-I/SN and 25C320T-I/SN variants. All share CS, SO, WP, VSS, SI, SCK, HOLD, and VCC assignments per Microchip's Pin Function Table. However, voltage ranges, clock limits, and temperature grades differ, so electrical compatibility must be verified per application for the 25LC320T-E/SN.
What is the typical standby current consumption of the 25LC320T-E/SN?
The 25LC320T-E/SN draws a typical standby current of 500 nA when CS is high and all inputs are tied to VCC or VSS, measured at VCC = 2.5 V. This ultra-low quiescent draw makes it suitable for battery-backed or energy-harvesting applications where minimizing leakage during sleep modes is critical - a key efficiency attribute confirmed in the DC Characteristics table for the 25LC320T-E/SN.
25LC320T-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:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC320T-E/SN FAQ
1.How can I place an order for 25LC320T-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC320T-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 25LC320T-E/SN reliable?
The price and inventory of 25LC320T-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 25LC320T-E/SN is usually 5 days.
3.What payment methods are accepted for 25LC320T-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC320T-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC320T-E/SN?
25LC320T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC320T-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 25LC320T-E/SN?
For technical support, including 25LC320T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC320T-E/SN requirements.
6.How does Aetrix verify that 25LC320T-E/SN is sourced from the original manufacturer or authorized distributors?
All 25LC320T-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 25LC320T-E/SN meets industry standards.
7.What is the process for return or replacement of 25LC320T-E/SN?
All 25LC320T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC320T-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 25LC320T-E/SN part is unused and in its original packaging.
Return procedure for 25LC320T-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25LC320T-E/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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