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Microchip Technology 25A512-I/SN
- Part No.:
- 25A512-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25A512-I/SN.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,435
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Product details
Overview
25A512-I/SN from Microchip Technology Inc. is a 512 Kbit (65,536-byte) SPI serial EEPROM with byte- and page-level write capability, 128-byte page size, 10 MHz max clock speed, and industrial temperature range (-40°C to +85°C). It integrates sector/chip erase functions, hardware write protection via WP pin, and deep power-down mode consuming only 1 µA at 2.5V - deployed in embedded control systems for parameter storage and firmware configuration.
For engineers reviewing the 25A512-I/SN datasheet, 25A512-I/SN pinout, 25A512-I/SN application, or 25A512-I/SN equivalent, key selection considerations include its 1.7–3.0 V supply range, SPI Mode 0/1 compatibility, 1 million endurance cycles, >200-year data retention, and Pb-free SOIC-8 (SN) packaging - critical for low-power, space-constrained industrial designs requiring nonvolatile memory with robust write protection.
Technical Context
The 25A512-I/SN implements a true SPI-compatible serial interface with separate SI (data-in) and SO (data-out) lines, supporting full-duplex communication under CS control and HOLD-based transaction suspension. Its internal architecture includes an 8-bit instruction register, page latches, HV generator, and EEPROM array organized into four 16 KB sectors.
It supports three erase granularities - page (5 ms), sector (10 ms), and chip (10 ms) - all self-timed and independent of prior erase requirements. Write operations require explicit WREN activation and automatic latch reset after completion, while STATUS register bits (WIP, WEL, BP0/BP1, WPEN) enable real-time monitoring and configurable hardware/software write protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 bytes), organized as 4 × 16 KB sectors |
| Interface | SPI-compatible serial bus (Mode 0 and Mode 1), with dedicated SI, SO, SCK, CS, HOLD, WP |
| Page Size | 128 bytes - defines maximum contiguous write length without crossing physical boundaries |
| Max Clock Frequency | 10 MHz at VCC ≥ 2.0 V - enables high-speed read/write in resource-constrained microcontroller systems |
| Write Endurance | 1 million erase/write cycles per page - validated at 25°C, 3.0V; critical for frequent calibration or logging use cases |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unattended industrial equipment |
| Deep Power-Down Current | 1 µA at 2.5 V, 85°C - enables ultra-low standby power in battery-backed or energy-harvesting applications |
Pinout & Package
25A512-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 150-mil body width, RoHS-compliant and Pb-free. Pin 1 is marked with a notch or dot; package outline conforms to JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable signal - selects device for SPI communication; high state forces SO into high-impedance to share bus |
| SO | Serial Data Output | Tri-state output - delivers read data on falling edge of SCK; enters high-Z when CS is high or HOLD is asserted |
| WP | Write-Protect Input | Hardware lock for STATUS register writes - active low only when WPEN bit is set; does not block memory writes |
| VSS | Ground Reference | Primary return path for all I/O and core circuitry - must be low-impedance connection to system ground plane |
| SI | Serial Data Input | Command/address/data input - latched on rising edge of SCK; supports instruction opcodes and 16-bit addresses |
| SCK | Serial Clock Input | Synchronization source - defines timing for SI sampling (rising edge) and SO updates (falling edge) |
| HOLD | Hold Input | Pauses ongoing SPI transaction - low level freezes internal state without resetting address pointer or command sequence |
| VCC | Supply Voltage | Core power rail - operates from 1.7 V to 3.0 V; powers logic, EEPROM array, and charge pump circuits |
Key Features
| Feature | Design Value |
|---|---|
| Page Erase (5 ms typical) | Enables fast, localized nonvolatile updates without full-chip erase - reduces wear on unaffected pages |
| Configurable Sector Protection | BP0/BP1 bits allow software-selectable write protection of 0%, 25%, 50%, or 100% of memory - prevents accidental overwrites in field-deployed units |
| Deep Power-Down Mode | Reduces current to 1 µA while preserving memory contents and allowing RDID-based wake-up - extends battery life in portable instrumentation |
| Electronic Signature Readout | RDID command (0xAB) returns fixed 0x29 manufacturer ID - enables automated BOM verification and counterfeit detection during production test |
| Power-On Write Protection | Automatic WEL reset at power-up and after every write operation - eliminates risk of unintended writes during brown-out or reset conditions |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and user-defined alarm thresholds in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to PIC® MCU SPI port; accessed during boot and runtime via READ/WRSR commands. Use Value: 1 million endurance cycles support daily reconfiguration; sector protection prevents corruption of safety-critical settings during firmware updates. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific therapy profiles in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure parameter storage with hardware write-lock (WP + WPEN); accessed during device initialization and calibration routines. Use Value: >200-year data retention ensures accuracy across product lifetime; deep power-down mode preserves settings during battery replacement. |
| Automotive Body Control Module | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Holding seat/mirror position presets, lighting profiles, and CAN node configuration in automotive BCMs exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade EEPROM providing SPI-accessible NVM; withstands thermal cycling and ESD events per ISO 10605 (4 kV HBM). Use Value: 1.7–3.0 V operation matches automotive LDO outputs; built-in power-on data protection prevents corruption during ignition transients. |
Use Scenario: Storing signed firmware patches and cryptographic keys in utility-grade smart meters requiring secure, field-upgradable code execution. IC Role / Device Role / Timing Role: Trusted nonvolatile storage for post-boot patch loading; accessed only by secure bootloader via verified SPI transactions. Use Value: Hardware write-protection (WP pin + BP bits) blocks unauthorized modification; electronic signature (0x29) confirms authentic Microchip silicon. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4 Mbit density, quad SPI interface, 85 MHz max clock; no HOLD pin; requires different command set | Better suited for high-throughput firmware storage; lacks page-erase granularity and deep power-down | Select only if higher density and faster read speed outweigh loss of fine-grained erase control and ultra-low-power modes |
| BR25H512FJ-WE2 | 512 Kbit, 1.7–5.5 V supply, 20 MHz max clock; built-in error correction; different pinout (8-pin TSSOP, same SN footprint but distinct pin mapping) | Enhanced reliability for safety-critical systems; requires PCB layout review due to differing SI/SO/HOLD assignments | Prefer where extended voltage range and ECC are mandatory; verify pin compatibility before drop-in replacement |
Compared with AT25DF041A-SSH-T and BR25H512FJ-WE2, the 25A512-I/SN offers optimal balance of page-level erase precision, 1 µA deep power-down, and proven SPI interoperability with Microchip PIC® MCUs - making it ideal for cost-sensitive, low-power industrial control nodes where deterministic write latency and sector-level protection are prioritized over raw bandwidth or extended voltage tolerance.
Availability
25A512-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for 25A512-I/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 for embedded control applications.
The 25A512-I/SN belongs to Microchip's legacy serial EEPROM product line designed specifically for reliable, low-voltage, SPI-based nonvolatile storage in space- and power-constrained industrial and automotive systems.
FAQ
What is the maximum clock frequency supported by the 25A512-I/SN?
The 25A512-I/SN supports up to 10 MHz clock frequency when VCC is 2.0 V or higher. At 1.7 V ≤ VCC < 2.0 V, the maximum clock frequency is reduced to 2 MHz. This dual-speed specification allows flexible integration across varying supply conditions while maintaining timing compliance per AC characteristics table in DS22237C.
Does the 25A512-I/SN require external erase before write operations?
No, the 25A512-I/SN does not require external erase before write operations. Its architecture performs automatic, self-timed erase as part of each write cycle - whether byte, page, sector, or chip - eliminating the need for pre-erase commands in typical usage. This simplifies firmware design and improves write efficiency in dynamic data logging scenarios.
How does hardware write protection work on the 25A512-I/SN?
Hardware write protection on the 25A512-I/SN is enabled only when both the WP pin is driven low AND the WPEN bit in the STATUS register is set high. When active, it prevents writes to nonvolatile STATUS register bits (BP0, BP1, WPEN) but allows normal memory reads and writes. The 25A512-I/SN defaults to WPEN = 0 at power-up, so WP pin grounding alone has no effect until WPEN is explicitly programmed.
What is the purpose of the HOLD pin on the 25A512-I/SN?
The HOLD pin on the 25A512-I/SN suspends ongoing SPI communication without resetting the internal address pointer or command state. When pulled low mid-transaction, it freezes data transfer and ignores further SCK edges until released. This allows host microcontrollers to service higher-priority interrupts and resume exactly where transmission left off - essential for deterministic real-time systems using the 25A512-I/SN.
Can the 25A512-I/SN be used in 1.8 V systems?
Yes, the 25A512-I/SN is fully specified for operation from 1.7 V to 3.0 V, including 1.8 V nominal systems. At 1.8 V, its maximum clock frequency is 10 MHz, read/write currents remain within datasheet limits (e.g., ICC Read = 5 mA), and all AC timing parameters meet specification - making it suitable for modern low-voltage microcontroller interfaces without level-shifting.
25A512-I/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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 3V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25A512-I/SN FAQ
1.How can I place an order for 25A512-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25A512-I/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 25A512-I/SN reliable?
The price and inventory of 25A512-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25A512-I/SN is usually 5 days.
3.What payment methods are accepted for 25A512-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25A512-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25A512-I/SN?
25A512-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25A512-I/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 25A512-I/SN?
For technical support, including 25A512-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25A512-I/SN requirements.
6.How does Aetrix verify that 25A512-I/SN is sourced from the original manufacturer or authorized distributors?
All 25A512-I/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 25A512-I/SN meets industry standards.
7.What is the process for return or replacement of 25A512-I/SN?
All 25A512-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25A512-I/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 25A512-I/SN part is unused and in its original packaging.
Return procedure for 25A512-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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