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Microchip Technology AT25512N-SH-B
- Part No.:
- AT25512N-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25512N-SH-B.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,186
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Product details
Overview
AT25512N-SH-B from Microchip Technology is a 512 Kbit SPI Serial EEPROM (65,536 × 8) optimized for low-voltage industrial applications. It operates from 1.8V to 5.5V, supports 20 MHz clock rate at 5V, features 128-byte page write capability, and provides hardware/software write protection via WP and STATUS register. It is used in firmware storage, configuration memory, and calibration data retention in embedded controllers.
For engineers reviewing the AT25512N-SH-B datasheet, AT25512N-SH-B pinout, AT25512N-SH-B application, or AT25512N-SH-B equivalent, key selection criteria include SPI Mode 0/3 compatibility, industrial temperature range (−40°C to +85°C), 5 ms max self-timed write cycle, 1M endurance, and 100-year data retention - all confirmed for this SOIC-8 variant.
Technical Context
The AT25512N-SH-B implements a synchronous SPI slave interface with fixed MSB-first serial protocol, supporting both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Its internal architecture includes a high-voltage generation circuit for EEPROM programming, a status register with nonvolatile BP1/BP0 block protection bits, and a power-on reset (POR) circuit ensuring stable initialization.
Write operations require explicit WREN instruction before WRITE or WRSR commands; the RDY/BSY bit enables polling-based timing control. The HOLD pin suspends serial communication without affecting ongoing internal write cycles, and the WP pin - when enabled via WPEN - blocks STATUS register writes while allowing memory reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbits (65,536 × 8); sufficient for storing bootloader config, device ID, sensor calibration tables |
| Interface | SPI-compatible, Modes 0 & 3; ensures interoperability with most microcontrollers including ARM Cortex-M, PIC, and ESP32 |
| Supply Voltage | 1.8V–5.5V; enables direct integration into 1.8V, 3.3V, and 5V systems without level-shifting |
| Max Clock Rate | 20 MHz at 5V; supports fast read/write bursts in time-critical firmware update sequences |
| Page Size | 128 bytes; minimizes write overhead by enabling efficient multi-byte programming per command |
| Write Endurance | 1,000,000 cycles; suitable for dynamic parameter logging or field-updatable settings in industrial gateways |
| Data Retention | 100 years at 55°C; guarantees long-term reliability of stored calibration or security keys across product lifetime |
Pinout & Package
AT25512N-SH-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard JEDEC MS-012AC footprint. This surface-mount package supports automated assembly and offers thermal and mechanical stability for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be driven low before any SPI transaction; requires pull-up resistor (≤10 kΩ) for robust power-up behavior |
| SO | Serial Data Output | Tri-state output; drives data on falling edge of SCK; high-impedance when CS is high or HOLD is active |
| WP | Write-Protect | Hardware lock for STATUS register; functional only when WPEN bit = 1; allows system-level write disable independent of software state |
| GND | Ground Reference | Primary return path for VCC and I/O; must be connected to system ground plane for noise immunity and ESD discharge |
| SI | Serial Data Input | Accepts opcodes, addresses, and data on rising edge of SCK; MSB-first protocol mandates precise timing alignment |
| SCK | Serial Clock Input | Master-generated clock; defines data sampling (rising edge) and output (falling edge); idle polarity depends on SPI mode |
| HOLD | Suspend Control | Pauses SPI communication during active CS; does not interrupt ongoing write cycles; useful for real-time system preemption |
| VCC | Power Supply | 1.8V–5.5V input; requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Configurable 1/4, 1/2, or full array protection via BP1/BP0 bits - prevents accidental overwrite of critical firmware sections |
| Hardware + Software Write Protection | Combines dedicated WP pin with STATUS register control - enables layered security for factory programming and field updates |
| Self-Timed Write Cycle | ≤5 ms maximum duration - eliminates need for external write timing control; RDY/BSY polling simplifies host firmware logic |
| Industrial Temperature Range | −40°C to +85°C operation - validated for use in motor drives, PLC modules, and outdoor IoT edge nodes |
| Green Packaging | RoHS-compliant, lead-free, halide-free SOIC - meets global environmental compliance requirements without derating |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
Use Scenario: Storing sensor offset/gain coefficients and linearization tables in battery-powered wireless temperature/humidity nodes. IC Role / Device Role: Nonvolatile configuration memory interfaced to an ultra-low-power MCU via SPI. Use Value: 1.8V operation extends battery life; 100-year retention ensures calibration integrity over device lifetime without recalibration. | Use Scenario: Holding FDA-mandated calibration history and user-adjustable therapy parameters in portable infusion pumps. IC Role / Device Role: Secure, tamper-resistant parameter store with hardware write lock for regulatory audit trails. Use Value: WP pin + BP bits prevent unauthorized modification; 1M endurance supports frequent parameter updates during clinical maintenance. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Recording tariff schedules, metering constants, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role: High-reliability data logger co-located with metrology SoC. Use Value: −40°C to +85°C rating ensures operation in outdoor meter enclosures; ESD >4 kV withstand protects against field handling surges. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle door modules. IC Role / Device Role: User preference memory accessed during ignition-on initialization. Use Value: 128-byte page writes reduce EEPROM wear during multi-parameter saves; SOIC-8 footprint fits constrained PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95512-DFMN6TP | STMicroelectronics 512 Kbit SPI EEPROM; identical 1.8–5.5V range, 20 MHz max, SOIC-8, but uses different STATUS register layout and lacks HOLD pin | No HOLD functionality limits use in real-time systems requiring SPI pause; WP behavior differs in default state and WPEN dependency | Select when HOLD is unused and ST's qualification ecosystem (AEC-Q100 optional) is required |
| 25AA512-I/SN | Microchip's pin-compatible 512 Kbit SPI EEPROM; same SOIC-8 package, 1.8–5.5V, 20 MHz, but rated for extended temp (−40°C to +125°C) and includes enhanced ESD (6 kV) | Higher temperature rating and ESD margin suit under-hood automotive or high-ambient industrial environments | Select when operating beyond +85°C or requiring higher surge immunity in harsh electrical environments |
Compared with M95512-DFMN6TP and 25AA512-I/SN, AT25512N-SH-B provides verified HOLD functionality and factory-default WPEN=0 for flexible initial programming, making it optimal for cost-sensitive industrial designs where full temperature extension or ultra-high ESD is not mandated.
Availability
AT25512N-SH-B is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, smart energy meters, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for AT25512N-SH-B 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 infrastructure.
The AT25512N-SH-B belongs to Microchip's AT25xxx family of SPI Serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems across industrial, medical, and automotive markets.
FAQ
What is the operating voltage range of the AT25512N-SH-B?
The AT25512N-SH-B operates from 1.8V to 5.5V DC, supporting direct integration into 1.8V logic systems, 3.3V microcontrollers, and legacy 5V designs without level translation. This wide range is validated across the full industrial temperature span (−40°C to +85°C), and the device includes internal voltage regulation to maintain consistent timing and write performance across the entire supply window. AT25512N-SH-B datasheet Section 4.2 confirms VCC = 1.8V–5.5V as the guaranteed operating range.
Does the AT25512N-SH-B support SPI Mode 3, and how is it configured?
Yes, the AT25512N-SH-B supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). No configuration is required - the device automatically adapts based on SCK idle polarity: Mode 0 expects SCK low when CS is deasserted, Mode 3 expects SCK high. Data is always latched on the rising edge and output on the falling edge of SCK. AT25512N-SH-B datasheet Section 5.1 explicitly states dual-mode support and timing equivalence between modes.
How does the HOLD pin function during an active write cycle in the AT25512N-SH-B?
The HOLD pin in the AT25512N-SH-B has no effect on an ongoing internal write cycle - it only suspends serial communication (SI/SO/SCK interaction) while CS remains asserted. If a byte-write or page-write is already executing, HOLD will not pause or abort it; the write completes autonomously. HOLD is intended for bus arbitration, not write interruption. AT25512N-SH-B datasheet Section 5.3 and Figure 5-2 confirm this behavior, noting that "Hold mode does not have an effect on the internal write cycle."
What is the default state of the STATUS register after power-up for the AT25512N-SH-B?
At power-up, the AT25512N-SH-B defaults to: WEL = 0 (write disabled), RDY/BSY = 0 (ready), WPEN = 0 (WP pin function blocked), and BP1/BP0 = 00 (no array protection). Crucially, WPEN and BP bits retain their last written nonvolatile values - they are *not* reset - so factory defaults apply only on first power-up or after WRSR with cleared bits. AT25512N-SH-B datasheet Section 4.6.5 and 4.6.6 document this exact default sequence and nonvolatile persistence.
Can the AT25512N-SH-B be used in automotive applications, and what qualifications does it hold?
The AT25512N-SH-B is qualified for industrial temperature range (−40°C to +85°C) and RoHS compliance, but it is not AEC-Q200 qualified and lacks automotive-specific stress testing or failure-in-time (FIT) data. While it may function in cabin-grade automotive modules (e.g., infotainment or body control), Microchip positions the pin-compatible 25AA512-I/SN for automotive use due to its extended −40°C to +125°C rating and optional AEC-Q200 qualification. AT25512N-SH-B datasheet Section 4.2 lists only industrial temp grade, confirming its target domain.
AT25512N-SH-B 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25512N-SH-B FAQ
1.How can I place an order for AT25512N-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25512N-SH-B 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 AT25512N-SH-B reliable?
The price and inventory of AT25512N-SH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25512N-SH-B is usually 5 days.
3.What payment methods are accepted for AT25512N-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25512N-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25512N-SH-B?
AT25512N-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25512N-SH-B 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 AT25512N-SH-B?
For technical support, including AT25512N-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25512N-SH-B requirements.
6.How does Aetrix verify that AT25512N-SH-B is sourced from the original manufacturer or authorized distributors?
All AT25512N-SH-B 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 AT25512N-SH-B meets industry standards.
7.What is the process for return or replacement of AT25512N-SH-B?
All AT25512N-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25512N-SH-B, 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 AT25512N-SH-B part is unused and in its original packaging.
Return procedure for AT25512N-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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