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Microchip Technology 25LC512-E/SN
- Part No.:
- 25LC512-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC512-E/SN.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,405
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Product details
Overview
25LC512-E/SN from Microchip Technology Inc. is a 512 Kbit (65,536-byte) SPI serial EEPROM with byte- and page-write capability, 128-byte page size, 20 MHz max clock speed, and deep power-down mode consuming only 1 µA at 2.5V. It operates across -40°C to +125°C and supports hardware write protection via WP pin and STATUS register configuration.
For engineers reviewing the 25LC512-E/SN datasheet, 25LC512-E/SN pinout, 25LC512-E/SN application, or 25LC512-E/SN equivalent, this device is selected for nonvolatile data storage in automotive AEC-Q100-compliant systems, industrial controllers requiring sector-level erase, and embedded designs needing SPI-compatible memory with low standby current and electronic signature verification.
Technical Context
The 25LC512-E/SN implements a true SPI interface (Mode 0,0 and Mode 1,1 compatible) with separate SI and SO lines, CS-controlled selection, and HOLD pin for transaction suspension without sequence reset. Its internal architecture includes an 8-bit instruction register, page latches, HV generator for EEPROM programming, and status register with WIP, WEL, BP0/BP1, and WPEN bits.
It supports four erase granularities-byte (implicit), page (5 ms typical), sector (10 ms/sector), and chip-wide (10 ms)-all self-timed and independent of external timing control. Write protection is configurable per 16 KB sector (four sectors total), with hardware lock enabled only when WP = low and WPEN = 1 in STATUS register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 × 8-bit bytes), organized as 4 sectors of 16 KB each |
| Interface | SPI-compatible serial bus (CS, SCK, SI, SO, HOLD, WP); no I²C or UART support |
| Page Size | 128 bytes - maximum contiguous write length without wraparound or boundary violation |
| Write Cycle Time | 5 ms max for byte or page write - determines minimum time between write commands |
| Endurance | 1 million erase/write cycles per page - validated at 25°C, 5.5V; wear leveling must be implemented externally |
| Data Retention | >200 years at 25°C - guaranteed nonvolatile storage lifetime under specified voltage/temperature conditions |
| Supply Voltage | 2.5 V to 5.5 V - supports both 3.3 V and 5 V host systems without level shifting |
| Deep Power-Down Current | 1 µA at 2.5 V, 85°C - enables ultra-low-power battery-backed operation during system sleep |
Pinout & Package
25LC512-E/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150 mil body width, surface-mount footprint, and RoHS-compliant lead finish. Pin 1 is marked with a notch or dot; package meets JEDEC MS-012 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: pulls device out of Standby mode; rising edge after valid write initiates internal write cycle |
| SO | Serial Data Output | Tri-state CMOS output; data shifted out on falling edge of SCK; high-impedance when CS high or HOLD low |
| WP | Write-Protect Input | Hardware lock control: blocks STATUS register writes only when WP = low AND WPEN = 1; otherwise ignored |
| VSS | Ground Reference | Primary return path for all digital and internal charge-pump currents; must be low-impedance connection |
| SI | Serial Data Input | Latches data/instructions on rising edge of SCK; accepts 8-bit opcodes, 16-bit addresses, and up to 128 bytes of payload |
| SCK | Serial Clock Input | Asynchronous master-generated clock; max 20 MHz at VCC ≥ 4.5 V; rise/fall times ≤ 20 ns required |
| HOLD | Hold Input | Pauses ongoing SPI transaction (CS low, SCK low required to assert); SO tri-states immediately on HOLD low |
| VCC | Supply Voltage | Power input for core logic and EEPROM programming; internal charge pump derives high voltage for write/erase operations |
Key Features
| Feature | Design Value |
|---|---|
| Page, Sector, and Chip Erase | Enables selective memory management without full-array reprogramming - reduces firmware overhead vs. basic EEPROMs |
| Electronic Signature (RDID) | Provides factory-programmed 8-bit ID read via RDID command - used for production verification and counterfeit detection |
| Deep Power-Down Mode | Reduces current to 1 µA while preserving memory contents - critical for energy harvesting and long-life battery applications |
| Hardware Write Protection | Configurable per 16 KB sector using BP0/BP1 bits and WP pin - prevents accidental overwrites in field-deployed systems |
| AEC-Q100 Qualified | Validated for automotive temperature range (-40°C to +125°C) and stress testing - suitable for engine control, ADAS, and infotainment |
| Self-Timed Internal Cycles | Eliminates need for external timing control or polling delay loops - simplifies driver implementation and improves reliability |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing calibration tables, fault logs, and adaptive learning parameters that must survive ignition cycles and extended temperature exposure. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to PIC® MCU SPI port; accessed during boot and runtime via READ/WRSR/PE commands. Use Value: AEC-Q100 qualification ensures reliable operation at 125°C ambient; 1M endurance supports >10 years of daily recalibration events. |
Use Scenario: Retaining user-defined I/O mapping, ladder logic parameters, and firmware update metadata across power loss in factory automation systems. IC Role / Device Role / Timing Role: SPI-connected persistent storage for real-time OS configuration; sector erase allows safe firmware rollback without affecting operational settings. Use Value: 128-byte page writes minimize bus occupancy during parameter updates; WP pin hardens against EMI-induced corruption during motor switching transients. |
| Medical Infusion Pump Data Logging | Smart Meter Firmware Patch Storage |
Use Scenario: Recording dose history, alarm timestamps, and sensor calibration drift in battery-powered portable devices requiring FDA-grade data integrity. IC Role / Device Role / Timing Role: Secure nonvolatile log buffer accessed via SPI with HOLD-enabled interrupt handling; deep power-down extends battery life between doses. Use Value: >200-year data retention guarantees audit trail validity over product lifetime; electronic signature confirms authentic Microchip silicon during regulatory audits. |
Use Scenario: Storing encrypted firmware patches and cryptographic keys in utility meters deployed in unattended outdoor locations with limited maintenance windows. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with hardware write protection; RDID command verifies authenticity before applying updates. Use Value: Sector-level erase enables atomic patch application; 1 µA deep power-down current extends 10-year battery life without compromising security. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF512C-SSH-T | 512 Kbit SPI Flash (not EEPROM); requires explicit sector erase before write; no byte-write capability | Higher density scalability but lacks true EEPROM semantics; unsuitable for frequent small-data updates | Select only if firmware already uses flash-aware drivers and endurance requirements are <100k cycles |
| 25AA512-I/SN | Pin-compatible 512 Kbit SPI EEPROM; identical SOIC-8 package and pinout; same 128-byte page size but rated only for Industrial (-40°C to +85°C) | Lacks AEC-Q100 qualification and Extended temperature rating; not approved for automotive under-hood use | Use where cost sensitivity outweighs automotive qualification needs; verify thermal derating in high-temp enclosures |
Compared with AT25DF512C-SSH-T and 25AA512-I/SN, the 25LC512-E/SN uniquely delivers automotive-grade temperature operation, true byte-write capability without pre-erase, and hardware-configurable sector protection - making it the only choice for safety-critical, high-cycle-count, and thermally demanding deployments.
Availability
25LC512-E/SN is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC configuration storage, and medical device data logging requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC512-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with design centers worldwide and ISO 9001-certified manufacturing.
The 25LC512-E/SN belongs to Microchip's legacy SPI EEPROM product line, engineered for robustness in harsh environments and designed specifically for automotive, industrial, and medical applications requiring guaranteed data integrity and long-term reliability.
FAQ
What is the maximum clock frequency supported by the 25LC512-E/SN?
The 25LC512-E/SN supports a maximum SPI clock frequency of 20 MHz when VCC is 4.5 V to 5.5 V, and 10 MHz when VCC is 2.5 V to less than 4.5 V. These limits are defined in Table 1-2 AC Characteristics and apply across the full operating temperature range (-40°C to +125°C). Exceeding these frequencies may cause read/write failures or data corruption.
Does the 25LC512-E/SN require external erase before writing new data?
No, the 25LC512-E/SN does not require external erase before writing. Its architecture performs implicit page erase during write operations, enabling true byte- and page-level writes without separate erase commands. Explicit erase (PE/SE/CE) is optional and used only for bulk management or recovery - not for routine data updates.
How does hardware write protection work on the 25LC512-E/SN?
Hardware write protection on the 25LC512-E/SN activates only when both conditions are met: the WP pin is driven low AND the WPEN bit (bit 7 of STATUS register) is set to 1. When active, it disables writes to nonvolatile STATUS register bits only - all other operations including memory reads, writes, and erases remain functional.
What is the purpose of the HOLD pin on the 25LC512-E/SN?
The HOLD pin on the 25LC512-E/SN suspends an ongoing SPI transaction without resetting the internal state or requiring retransmission. When asserted (low) while CS is active and SCK is low, it places SO in high-impedance and ignores SI/SCK transitions - allowing the host MCU to service higher-priority interrupts and resume communication seamlessly.
Is the 25LC512-E/SN compatible with standard SPI Mode 0,0 and Mode 1,1?
Yes, the 25LC512-E/SN is fully compatible with SPI Mode 0,0 (CPOL = 0, CPHA = 0) and Mode 1,1 (CPOL = 1, CPHA = 1), as confirmed in Figure 1-2 and Figure 1-3 of DS20002065D. Data is sampled on the rising edge of SCK and output on the falling edge, supporting direct integration with Microchip PIC® MCUs and most ARM Cortex-M SPI peripherals.
25LC512-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:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 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
25LC512-E/SN FAQ
1.How can I place an order for 25LC512-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC512-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 25LC512-E/SN reliable?
The price and inventory of 25LC512-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 25LC512-E/SN is usually 5 days.
3.What payment methods are accepted for 25LC512-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC512-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC512-E/SN?
25LC512-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC512-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 25LC512-E/SN?
For technical support, including 25LC512-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC512-E/SN requirements.
6.How does Aetrix verify that 25LC512-E/SN is sourced from the original manufacturer or authorized distributors?
All 25LC512-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 25LC512-E/SN meets industry standards.
7.What is the process for return or replacement of 25LC512-E/SN?
All 25LC512-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC512-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 25LC512-E/SN part is unused and in its original packaging.
Return procedure for 25LC512-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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