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Microchip Technology 25LC512T-I/SM
- Part No.:
- 25LC512T-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
25LC512T-I/SM.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,605
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Product details
Overview
25LC512T-I/SM from Microchip Technology is a 512 Kbit (64 KB) SPI serial EEPROM with byte- and page-write capability, 128-byte page size, 20 MHz max clock speed, and industrial temperature range (–40°C to +85°C). It features hardware write protection via WP pin, HOLD function for interrupt-safe bus pausing, and deep power-down mode drawing only 1 µA at 2.5V.
For engineers reviewing the 25LC512T-I/SM datasheet, 25LC512T-I/SM pinout, 25LC512T-I/SM application, or 25LC512T-I/SM equivalent, this device serves as a drop-in nonvolatile memory solution in microcontroller-based systems requiring reliable parameter storage, firmware configuration, or calibration data retention across power cycles and extended lifetimes.
Technical Context
The 25LC512T-I/SM implements a true SPI-compatible interface (Mode 0,0 and Mode 1,1 supported) with separate SI and SO lines, enabling full-duplex command/data flow under CS control. 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 self-timed erase/write operations - including byte write (≤5 ms), page erase (5 ms typ.), sector erase (10 ms typ.), and chip erase (10 ms typ.) - without requiring pre-erase. Write protection is configurable per 16 KB sector (BP0/BP1), and hardware lock is enabled only when WP = low and WPEN = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 bytes), organized as 64 KB × 1-bit; sufficient for firmware boot parameters or multi-sensor calibration tables |
| Interface | SPI-compatible serial bus (CS, SCK, SI, SO, HOLD, WP); no I²C or parallel bus required - reduces MCU pin count and PCB routing complexity |
| Page Size | 128 bytes; enables efficient bulk writes within aligned boundaries - critical for minimizing write cycles during firmware update staging |
| Max Clock Speed | 20 MHz at VCC ≥ 4.5V; supports high-throughput configuration loading in real-time embedded systems |
| Write Endurance | 1 million erase/write cycles per page; ensures >10 years of daily reconfiguration in industrial logging applications |
| Data Retention | >200 years at 25°C; guarantees long-term integrity of stored calibration coefficients or security keys without refresh |
| Deep Power-Down Current | 1 µA at 2.5V and 85°C; enables ultra-low-power operation in battery-backed IoT edge nodes during sleep states |
Pinout & Package
25LC512T-I/SM is housed in an 8-lead SOIJ (Small Outline J-Lead) package, pin-compatible with SOIC and PDIP variants. The exposed pad on DFN-S variants is not present in this SOIJ version.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into standby when high; initiates internal write cycle on rising edge after valid write sequence |
| SO | Serial Data Output | Tri-state output: shifts out read data on SCK falling edge; enters high-Z immediately on HOLD low assertion |
| WP | Write-Protect Pin | 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 EEPROM programming currents; must be low-impedance for stable timing |
| SI | Serial Data Input | Latches instructions, addresses, and data on SCK rising edge; supports MSB-first SPI framing |
| SCK | Serial Clock Input | Asynchronous master clock: defines timing windows for SI sampling (rising edge) and SO update (falling edge) |
| HOLD | Bus Hold Control | Pauses ongoing SPI transaction without reset: SO tri-states instantly; resumes from exact bit position on HOLD high |
| VCC | Supply Voltage | 2.5V–5.5V operation: supports direct interfacing with 3.3V and 5V MCUs; deep power-down active down to 2.5V |
Key Features
| Feature | Design Value |
|---|---|
| Page, Sector & Chip Erase | Enables selective memory management: 5 ms page erase avoids full-chip erasure during partial updates - preserves unmodified sectors |
| Hardware Write Protection | Configurable per 16 KB sector via BP0/BP1 bits; WP pin + WPEN bit combination prevents accidental overwrites in field-deployed units |
| HOLD Function | Allows host MCU to service higher-priority interrupts mid-transaction; eliminates need for software state save/restore logic |
| Deep Power-Down Mode | Reduces current to 1 µA while retaining memory contents; provides both power savings and software-controlled write lockout |
| Electronic Signature (RDID) | 8-bit manufacturer ID (0x30) readable even from deep power-down; enables automated BOM verification and counterfeit detection |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via SPI during boot and runtime parameter adjustment. Use Value: 1M endurance and >200-year data retention ensure consistent behavior across 15+ year product lifecycles without recalibration. |
Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault isolated from main MCU flash; accessed only during calibration or audit. Use Value: Hardware write protection (WP + WPEN) prevents unauthorized modification of calibrated values during field servicing. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware Settings |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and error codes in AEC-Q100 qualified body electronics modules. IC Role / Device Role / Timing Role: SPI-connected EEPROM co-located with MCU; withstands –40°C to +125°C ambient per AEC-Q100 Grade 1. Use Value: Deep power-down mode (1 µA) extends battery life during vehicle sleep states while preserving user preferences. |
Use Scenario: Storing tariff schedules, pulse constants, and communication credentials in ANSI C12.22-compliant utility meters deployed outdoors. IC Role / Device Role / Timing Role: Isolated configuration store updated infrequently but requiring absolute reliability across decades of operation. Use Value: ESD protection >4 kV and robust SOIJ packaging ensure resilience against lightning-induced transients on meter PCBs. |
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 sector erase before write; lacks HOLD pin and deep power-down mode | Higher density available in same footprint but unsuitable for frequent byte-level updates due to erase latency | Select only if firmware image storage dominates over parameter logging; verify erase/write timing impact on real-time response |
| 25AA512-I/SN | Same 512 Kbit SPI EEPROM architecture; SOIC-8 package (SN) instead of SOIJ-8 (SM); identical electrical specs and instruction set | Direct mechanical replacement where board layout allows SOIC lead form; same thermal and reliability profile | Choose for standard surface-mount assembly lines optimized for gull-wing leads; no firmware or timing changes required |
Compared with AT25DF512C-SSH-T, the 25LC512T-I/SM delivers true byte-write capability without erase overhead and integrated HOLD functionality for deterministic interrupt handling; compared with 25AA512-I/SN, it offers identical functionality in a space-constrained J-lead package ideal for high-vibration automotive mounting.
Availability
25LC512T-I/SM is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualification.
Supply support for 25LC512T-I/SM 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LC512T-I/SM belongs to Microchip's legacy SPI EEPROM product line, engineered for robust, low-power, pin-efficient nonvolatile storage in resource-constrained embedded systems across industrial, automotive, and medical markets.
FAQ
What is the maximum clock frequency supported by the 25LC512T-I/SM?
The 25LC512T-I/SM supports up to 20 MHz SPI clock frequency when VCC is between 4.5V and 5.5V. At lower supply voltages (2.5V ≤ VCC < 4.5V), the maximum clock rate is 10 MHz. These limits are specified across the full industrial temperature range (–40°C to +85°C) and ensure reliable setup/hold timing for SI and SO signals.
Does the 25LC512T-I/SM require external pull-up resistors on its SO or SI lines?
No, the 25LC512T-I/SM does not require external pull-ups on SO or SI. The SO pin is actively driven and tri-states when deselected or during HOLD; the SI pin is CMOS input with defined VIH/VIL thresholds. Pull-ups may be needed only if shared with open-drain buses - but that is not the intended SPI topology for the 25LC512T-I/SM.
How does the HOLD function interact with an ongoing write cycle in the 25LC512T-I/SM?
The HOLD function has no effect on an internal write cycle already in progress - once CS rises after a valid write sequence, the self-timed 5 ms write completes regardless of HOLD state. HOLD only suspends serial command/data transfer; it cannot abort or pause active EEPROM programming.
Can the 25LC512T-I/SM be used in systems powered by 3.3V logic without level shifting?
Yes, the 25LC512T-I/SM operates natively from 2.5V to 5.5V, making it fully compatible with 3.3V systems. Its VIH threshold is 0.7×VCC (min 2.31V at 3.3V), and VOL is guaranteed ≤0.4V at 2.1 mA - eliminating need for level shifters when interfacing with standard 3.3V MCUs.
What happens to the STATUS register's WEL bit after a successful WRITE instruction completes in the 25LC512T-I/SM?
After a successful WRITE instruction completes, the Write Enable Latch (WEL) bit in the STATUS register is automatically reset to '0'. This means the next write operation requires re-execution of the WREN instruction - a safety feature preventing unintended writes due to noise or software errors.
25LC512T-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
25LC512T-I/SM FAQ
1.How can I place an order for 25LC512T-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC512T-I/SM 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 25LC512T-I/SM reliable?
The price and inventory of 25LC512T-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC512T-I/SM is usually 5 days.
3.What payment methods are accepted for 25LC512T-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC512T-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC512T-I/SM?
25LC512T-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC512T-I/SM 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 25LC512T-I/SM?
For technical support, including 25LC512T-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC512T-I/SM requirements.
6.How does Aetrix verify that 25LC512T-I/SM is sourced from the original manufacturer or authorized distributors?
All 25LC512T-I/SM 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 25LC512T-I/SM meets industry standards.
7.What is the process for return or replacement of 25LC512T-I/SM?
All 25LC512T-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 25LC512T-I/SM, 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 25LC512T-I/SM part is unused and in its original packaging.
Return procedure for 25LC512T-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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