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Microchip Technology 25LC640A-E/SN
- Part No.:
- 25LC640A-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC640A-E/SN.pdf
- Description:
- IC EEPROM 64KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,336
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Product details
Overview
25LC640A-E/SN from Microchip Technology Inc. is a 64-Kbit SPI Serial EEPROM with 8192 × 8-bit organization, 32-byte page size, and 10 MHz max clock (at VCC ≥ 4.5V). It features hardware write protection via WP pin, HOLD functionality for interrupt-safe pausing, and operates across -40°C to +125°C (Extended temperature grade) in an 8-lead SOIC package. Used for nonvolatile configuration storage in automotive control modules.
For engineers reviewing the 25LC640A-E/SN datasheet, 25LC640A-E/SN pinout, 25LC640A-E/SN application, or 25LC640A-E/SN equivalent, key selection criteria include VCC range (2.5V–5.5V), endurance (1M cycles), data retention (>200 years), and AEC-Q100 qualification for automotive use.
Technical Context
The 25LC640A-E/SN implements a standard SPI Mode 0,0/M1,1 interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, and optional HOLD/WP control. Its internal architecture includes a 32-byte page latch, status register with BP0/BP1 block protection bits, and HV generator for EEPROM programming.
Write operations require explicit WREN instruction before WRITE or WRSR commands; self-timed internal write cycles complete in ≤5 ms. The device supports sequential read, automatic address rollover at 0x1FFF, and high-impedance tri-state outputs on SO, SI, and HOLD during hold or standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit array), sufficient for firmware parameter tables or calibration data in ECUs. |
| Interface | SPI-compatible serial bus (Mode 0,0 / Mode 1,1), enabling direct connection to PIC® and other MCU SPI peripherals without glue logic. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V; reduces to 5 MHz at 2.5V–4.5V, ensuring timing compliance across supply ranges. |
| Page Size | 32 bytes - defines maximum contiguous write length per command; crossing page boundaries wraps data within same page. |
| Endurance & Retention | 1,000,000 erase/write cycles and >200 years data retention at +25°C, validated for long-life automotive deployments. |
| Operating Temp | -40°C to +125°C (Extended grade), qualified to AEC-Q100 Rev G, suitable for under-hood and powertrain applications. |
| Supply Voltage | 2.5V to 5.5V - compatible with 3.3V and 5V systems; excludes 1.8V operation unlike 25AA640A variant. |
Pinout & Package
8-Lead Plastic Small Outline (SOIC-N), narrow body (3.90 mm), RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint (package code SN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; initiates internal write cycle on rising edge after valid write sequence; forces SO to high-Z when deasserted. |
| SO (Pin 2) | Serial Data Output | Tri-state output; data shifted out on falling edge of SCK; enters high-Z during HOLD or CS high. |
| WP (Pin 3) | Write-Protect Pin | Hardware lock for STATUS register when WPEN=1; low = blocks nonvolatile bit writes; no effect if WPEN=0. |
| VSS (Pin 4) | Ground | Reference return path for all digital and analog circuitry; must be low-impedance for noise immunity. |
| SI (Pin 5) | Serial Data Input | Instruction/address/data input; latched on rising edge of SCK; ignored during HOLD or CS high. |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transfers; rising edge clocks SI, falling edge updates SO; must be low before asserting HOLD. |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transaction without reset; requires SCK low to activate/resume; tri-states SO immediately. |
| VCC (Pin 8) | Supply Voltage | 2.5V–5.5V power rail; powers internal charge pump for EEPROM writes; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selectable via BP0/BP1 bits: protect none, upper 1/4 (0x1800–0x1FFF), upper 1/2 (0x1000–0x1FFF), or full array (0x0000–0x1FFF). |
| Power-On Data Protection | Write enable latch resets at power-up; WP pin + WPEN bit prevent unintended writes during brown-out or reset conditions. |
| HOLD Functionality | Enables host MCU to service higher-priority interrupts mid-transaction; resumes from exact byte position without re-synchronization. |
| AEC-Q100 Qualification | Validated for automotive Extended temperature range (-40°C to +125°C); includes stress testing per Rev G requirements. |
| Low Standby Current | 1 µA at 5.5V and +85°C - minimizes battery drain in always-on vehicle subsystems like door modules or sensors. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing trim values, fault codes, and adaptive learning parameters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to ECU's SPI master; accessed during boot and runtime diagnostics. Use Value: AEC-Q100 qualification ensures reliability under thermal cycling and vibration; 1M endurance supports frequent recalibration over 15+ year vehicle life. |
Use Scenario: Retaining I/O mapping, ladder logic settings, and calibration offsets in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: SPI EEPROM providing persistent storage for user-defined configurations independent of main controller power state. Use Value: 32-byte page writes enable efficient batch updates of parameter sets; HOLD pin allows seamless interruption during real-time motion control sequences. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding dose calibration constants, safety thresholds, and usage logs in battery-powered portable medical devices. IC Role / Device Role / Timing Role: Low-power serial memory storing critical operational data; accessed via microcontroller SPI during startup and periodic maintenance. Use Value: 1 µA standby current extends battery life; >200-year data retention meets ISO 13485 long-term archival requirements. |
Use Scenario: Storing tariff schedules, metering constants, and tamper-event logs in utility-grade electricity meters operating continuously for 10+ years. IC Role / Device Role / Timing Role: Robust nonvolatile memory co-located with metrology SoC; updated infrequently but requiring absolute data integrity. Use Value: ESD protection >4 kV prevents field failures from handling; block protection isolates critical firmware parameters from accidental overwrite. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA640A-E/SN | Wider VCC range (1.8V–5.5V); supports 1.8V systems; otherwise identical pinout, timing, and memory map. | Preferred for mixed-voltage designs or legacy 1.8V microcontrollers; not AEC-Q100 qualified. | Select when 1.8V operation is required; verify system-level ESD and temp compliance separately. |
| AT25DF641-AU | Dual/quad SPI interface; 64 Mbit density; sector erase capability; different command set and status register layout. | Used where faster bulk writes or firmware storage (vs. config storage) is needed; requires driver redesign. | Choose only if migrating to higher-density flash with execute-in-place or dual-line speed benefits; not drop-in compatible. |
Compared with 25AA640A-E/SN and AT25DF641-AU, the 25LC640A-E/SN provides optimal balance of AEC-Q100 assurance, proven 64-Kbit SPI EEPROM compatibility, and minimal firmware integration effort in automotive and industrial control systems.
Availability
25LC640A-E/SN is available at Aetrix Electronics and suitable for automotive engine management, industrial PLC configuration, and medical device calibration requiring stable component supply and long-term lifecycle support.
Supply support for 25LC640A-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LC640A belongs to Microchip's serial EEPROM product line, engineered specifically for reliable, low-power, SPI-based nonvolatile storage in automotive, industrial, and medical applications demanding extended temperature operation and AEC-Q100 compliance.
FAQ
What is the maximum clock frequency supported by the 25LC640A-E/SN?
The 25LC640A-E/SN supports up to 10 MHz clock frequency when VCC is 4.5V–5.5V. At 2.5V–4.5V, max clock drops to 5 MHz; at 1.8V–2.5V, it is 3 MHz - though 25LC640A-E/SN does not operate below 2.5V. This stepped frequency scaling ensures timing margin across voltage ranges.
Does the 25LC640A-E/SN support hardware write protection?
Yes, the 25LC640A-E/SN supports hardware write protection via the WP pin in conjunction with the WPEN bit in its STATUS register. When WP is low and WPEN=1, writes to nonvolatile STATUS bits are blocked. WPEN can be cleared in software to allow STATUS updates even with WP grounded.
What package type does the 25LC640A-E/SN use?
The 25LC640A-E/SN uses an 8-lead plastic small outline (SOIC-N) package with 3.90 mm body width (JEDEC MS-012AC), marked "SN" in Microchip's packaging nomenclature. It has gull-wing leads, RoHS-compliant finish, and is pin-compatible with other 8-lead SOIC EEPROMs.
How many write/erase cycles does the 25LC640A-E/SN guarantee?
The 25LC640A-E/SN guarantees 1,000,000 write/erase cycles per memory location at +25°C and VCC = 5.5V. Endurance is characterized across temperature and voltage; actual field life exceeds specification due to wear-leveling in typical usage patterns.
Is the 25LC640A-E/SN qualified for automotive applications?
Yes, the 25LC640A-E/SN is AEC-Q100 qualified for Extended temperature range (-40°C to +125°C), making it suitable for under-hood and powertrain applications. The "E" in the part number denotes Extended temp grade, and full qualification documentation is available from Microchip.
25LC640A-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 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
25LC640A-E/SN FAQ
1.How can I place an order for 25LC640A-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC640A-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 25LC640A-E/SN reliable?
The price and inventory of 25LC640A-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 25LC640A-E/SN is usually 5 days.
3.What payment methods are accepted for 25LC640A-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC640A-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC640A-E/SN?
25LC640A-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC640A-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 25LC640A-E/SN?
For technical support, including 25LC640A-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC640A-E/SN requirements.
6.How does Aetrix verify that 25LC640A-E/SN is sourced from the original manufacturer or authorized distributors?
All 25LC640A-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 25LC640A-E/SN meets industry standards.
7.What is the process for return or replacement of 25LC640A-E/SN?
All 25LC640A-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC640A-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 25LC640A-E/SN part is unused and in its original packaging.
Return procedure for 25LC640A-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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