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Microchip Technology 25AA512T-I/SN16KVAO
- Part No.:
- 25AA512T-I/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25AA512T-I/SN16KVAO.pdf
- Description:
- IC EEPROM 512KBIT SPI 2MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,448
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Product details
Overview
25AA512T-I/SN16KVAO from Microchip Technology is a 512 Kbit (65,536-byte) SPI serial EEPROM with 128-byte page write capability, 20 MHz max clock speed, and industrial temperature range (-40°C to +85°C). It supports byte/page writes without pre-erase, features hardware write protection via WP pin and STATUS register, and delivers 1 million erase/write cycles with >200 years data retention - used in firmware storage, calibration data logging, and configuration memory for embedded controllers.
For engineers reviewing the 25AA512T-I/SN16KVAO datasheet, 25AA512T-I/SN16KVAO pinout, 25AA512T-I/SN16KVAO application, or 25AA512T-I/SN16KVAO equivalent, this page provides verified electrical specs, SPI timing constraints, deep power-down behavior, sector-level write protection mapping, and validated alternative parts for industrial-grade nonvolatile memory selection.
Technical Context
The 25AA512T-I/SN16KVAO implements a standard SPI Mode 0,0/Motorola-compatible interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. Its internal architecture includes an 8-bit instruction register, page latches, HV generator, and EEPROM array segmented into four 16 KB sectors.
It supports full SPI command set including READ (0x03), WRITE (0x02), WREN/WRDI, RDSR/WRSR, PE (page erase), SE (sector erase), CE (chip erase), DPD (deep power-down), and RDID (electronic signature read). All write operations are self-timed with typical 5 ms internal write cycle time and automatic WEL reset upon completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 × 8-bit bytes), organized as 4 sectors × 16 KB |
| Interface | SPI-compatible serial bus (Mode 0,0), 4-wire: CS, SCK, SI, SO |
| Page Size | 128 bytes - maximum contiguous write length without crossing physical boundary |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V; 10 MHz at 2.5V ≤ VCC < 4.5V; 2.5 MHz at 1.8V ≤ VCC < 2.5V |
| Write Cycle Time | 5 ms typical for byte/page write or page erase; 10 ms for sector/chip erase |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers |
| Endurance & Retention | 1 million erase/write cycles per page; >200 years data retention at 85°C |
| Power Consumption | 1 µA deep power-down current at 2.5V; 7 mA max write current at 5.5V |
Pinout & Package
25AA512T-I/SN16KVAO uses an 8-lead SOIC package (SN suffix), with exposed pad not connected (per DFN footnote adaptation). Pin functions are electrically identical across SOIC, PDIP, SOIJ, and DFN variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: selects device for SPI communication; high forces standby mode and tri-states SO |
| SO (Pin 2) | Serial Data Output | CMOS output: data shifted out MSB-first on SCK falling edge; enters high-Z when CS high or HOLD low |
| WP (Pin 3) | Write-Protect Input | Hardware lock: disables STATUS register writes when WPEN=1 and WP=low; no effect if WPEN=0 |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; must be low-impedance connection |
| SI (Pin 5) | Serial Data Input | CMOS input: accepts instructions, addresses, and data on SCK rising edge |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transfers; rise/fall times ≤20 ns required for 20 MHz operation |
| HOLD (Pin 7) | Communication Pause Control | Halts ongoing SPI sequence without resetting state; SO tri-states immediately on HOLD low |
| VCC (Pin 8) | Supply Voltage | 1.8–5.5V operating range; powers internal charge pump for EEPROM programming |
Key Features
| Feature | Design Value |
|---|---|
| Page & Sector Erase Commands | Enables Flash-like flexibility: PE (5 ms), SE (10 ms), CE (10 ms) - optional for byte/page writes |
| Four-Level Hardware Write Protection | BP1/BP0 bits configure protection of 0%, 25%, 50%, or 100% of memory (16 KB sectors) |
| Deep Power-Down Mode | Reduces current to 1 µA at 2.5V; exited only by RDID command or power cycle |
| Electronic Signature Read (RDID) | Verifies device identity (0x20 0x14) and releases from deep power-down |
| Industrial Temp & AEC-Q100 Qualified | Rated for -40°C to +85°C operation and automotive qualification - suitable for under-hood ECUs |
| ESD Robustness | 4 kV HBM ESD protection on all pins - enhances reliability in manufacturing and field environments |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and firmware update flags in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime reconfiguration. Use Value: 128-byte page writes minimize update latency; sector protection prevents accidental overwrite of critical calibration data. |
Use Scenario: Holding door lock actuator profiles, lighting dimming curves, and seat position presets in automotive BCMs. IC Role / Device Role / Timing Role: AEC-Q100-qualified EEPROM providing persistent parameter storage across ignition cycles. Use Value: Deep power-down mode reduces parasitic draw below 1 µA; WP pin enables hardware lock during CAN firmware updates. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patching |
Use Scenario: Archiving dose calibration coefficients, error logs, and user audit trails in Class II medical devices. IC Role / Device Role / Timing Role: Secure, long-retention memory for FDA-required traceability data with tamper-resistant write protection. Use Value: >200-year data retention meets regulatory shelf-life requirements; 1M endurance supports daily recalibration cycles over 10+ years. |
Use Scenario: Storing encrypted firmware patches, tariff tables, and metering history in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: SPI EEPROM interfaced to ARM Cortex-M4 host MCU for secure over-the-air (OTA) update staging. Use Value: 20 MHz clock support enables fast patch loading; sector erase allows atomic replacement of firmware segments without full chip erase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC512-I/SN | Same 512 Kbit capacity, 128-byte page, and SOIC-8 package; operates at 2.5–5.5V (no 1.8V support) | Lacks 1.8V compatibility and AEC-Q100 qualification; suitable for 3.3V/5V-only industrial designs | Select when 1.8V operation is unnecessary and cost sensitivity outweighs automotive qualification needs. |
| AT25DF512C-SSH-T | 512 Kbit SPI DataFlash with 256-byte page, 85 MHz max clock, and integrated sector protection registers | Uses different command set (DataFlash protocol); requires firmware adaptation; higher performance but larger footprint | Choose for high-speed firmware streaming where 5 ms write latency is unacceptable and layout space permits larger SO8 package. |
Compared with 25AA512T-I/SN16KVAO, the 25LC512-I/SN offers identical functionality at lower cost but excludes 1.8V and automotive qualification, while AT25DF512C-SSH-T delivers faster throughput and advanced security features at the expense of command compatibility and design portability.
Availability
25AA512T-I/SN16KVAO is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive body control modules, medical infusion pump calibration, and smart energy meter firmware patching requiring stable component supply across extended product lifecycles.
Supply support for 25AA512T-I/SN16KVAO 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 25AA512T-I/SN16KVAO belongs to Microchip's legacy SPI EEPROM product line, engineered for robust, low-power, long-life nonvolatile storage in resource-constrained embedded systems where reliability and qualification matter more than raw speed.
FAQ
What is the minimum supply voltage required for reliable operation of the 25AA512T-I/SN16KVAO?
The 25AA512T-I/SN16KVAO operates reliably from 1.8V to 5.5V. At 1.8V, it supports up to 2.5 MHz SPI clock (for -40°C to +85°C industrial range); full 20 MHz operation requires VCC ≥ 4.5V. The 1.8V capability enables direct integration with ultra-low-power microcontrollers without level-shifting.
Does the 25AA512T-I/SN16KVAO support true SPI Mode 3 (CPOL=1, CPHA=1)?
No, the 25AA512T-I/SN16KVAO supports only SPI Mode 0,0 (CPOL=0, CPHA=0): data sampled on SCK rising edge, output changed on falling edge. It does not support Mode 3 or dual/quad SPI. Compatibility is confirmed by Microchip's DS20002021H datasheet Section 3.1 and Figure 1-2.
How does the HOLD pin function during an active write cycle in the 25AA512T-I/SN16KVAO?
The HOLD pin cannot suspend an ongoing internal write cycle (e.g., after CS goes high post-WRITE command). It only pauses active SPI communication (instruction/address/data transfer) while CS remains low. Once the write cycle begins (self-timed after CS high), HOLD has no effect - the WIP bit must be polled to detect completion.
Can the 25AA512T-I/SN16KVAO be used as a drop-in replacement for the 25AA512-I/SN?
Yes - the 25AA512T-I/SN16KVAO is a tape-and-reel variant of the same die and package as the 25AA512-I/SN. Both share identical electrical specs, timing, pinout, and functionality. The "T" suffix denotes tape-and-reel packaging; "16KVAO" indicates reel size and orientation per Microchip's ordering code convention.
What happens to the STATUS register's BP bits after issuing a Chip Erase (CE) command on the 25AA512T-I/SN16KVAO?
The Chip Erase (CE) command erases all memory array contents to 0xFF but leaves the STATUS register unchanged - including BP0, BP1, and WPEN bits. This preserves write protection settings across bulk erases, ensuring protected sectors remain locked unless explicitly modified via WRSR.
25AA512T-I/SN16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25AA512T-I/SN16KVAO FAQ
1.How can I place an order for 25AA512T-I/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA512T-I/SN16KVAO 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 25AA512T-I/SN16KVAO reliable?
The price and inventory of 25AA512T-I/SN16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA512T-I/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 25AA512T-I/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA512T-I/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA512T-I/SN16KVAO?
25AA512T-I/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA512T-I/SN16KVAO 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 25AA512T-I/SN16KVAO?
For technical support, including 25AA512T-I/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA512T-I/SN16KVAO requirements.
6.How does Aetrix verify that 25AA512T-I/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 25AA512T-I/SN16KVAO 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 25AA512T-I/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 25AA512T-I/SN16KVAO?
All 25AA512T-I/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25AA512T-I/SN16KVAO, 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 25AA512T-I/SN16KVAO part is unused and in its original packaging.
Return procedure for 25AA512T-I/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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