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Microchip Technology 25AA02E64-I/SN
- Part No.:
- 25AA02E64-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25AA02E64-I/SN.pdf
- Description:
- IC EEPROM 2KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
25AA02E64-I/SN from Microchip Technology Inc. is a 2 Kbit SPI serial EEPROM with factory-programmed, globally unique EUI-64™ node address stored at addresses 0xF8–0xFF. It operates from 1.8V to 5.5V, supports up to 10 MHz clock frequency at 4.5–5.5V, features 16-byte page write capability, and delivers 1 µA standby current at 2.5V for low-power embedded identity storage in industrial networking and IoT edge nodes.
For engineers reviewing the 25AA02E64-I/SN datasheet, 25AA02E64-I/SN pinout, 25AA02E64-I/SN application, or 25AA02E64-I/SN equivalent, this device serves as a secure, preprogrammed MAC address source for Ethernet/Wi-Fi modules, enables tamper-resistant device identity in industrial gateways, and provides reliable nonvolatile configuration storage with hardware write protection and HOLD functionality for interrupt-safe SPI communication.
Technical Context
The 25AA02E64-I/SN implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI and SO lines, requiring CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming, with automatic address incrementing during sequential reads and wraparound on page boundary overflow.
It integrates dual-layer write protection: hardware-level via the WP pin (active-low), and software-configurable block protection (BP0/BP1 bits) enabling selective lock of 0%, 25%, 50%, or 100% of the 256-byte array. The STATUS register is readable during write cycles, supporting WIP bit polling for write completion detection without blocking host operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 × 8-bit (2 Kbit) organization - sufficient for EUI-64™ address + user configuration data in compact footprint. |
| Interface | SPI-compatible serial bus (Mode 0,0) - interoperable with PIC® and other MCU SPI peripherals without protocol translation. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V - enables fast read/write throughput (up to 1.25 MB/s theoretical) for time-critical boot identity fetch. |
| Write Endurance | 1,000,000 erase/write cycles - supports frequent firmware update logging or runtime parameter storage in field-deployed devices. |
| Data Retention | >200 years at +25°C - ensures permanent preservation of factory-assigned EUI-64™ identity across product lifecycle. |
| Operating Voltage | 1.8V to 5.5V - compatible with both 3.3V and 5V systems, including battery-powered sensors and legacy industrial controllers. |
| Standby Current | 1 µA at 2.5V, +85°C - minimizes quiescent power in always-on networked devices with sleep-mode requirements. |
Pinout & Package
25AA02E64-I/SN is packaged in an 8-lead SOIC (SN) with 3.90 mm body width, RoHS-compliant matte tin plating, and JEDEC-standard footprint. Pin 1 is marked by a beveled corner or laser dot per Microchip Drawing C04-057-SN Rev D.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select Input | Active-low enable: asserts SPI slave selection; rising edge after write sequence triggers internal 5 ms write cycle. |
| 2 (SO) | Serial Data Output | Tri-state open-drain output: delivers read data on falling SCK edge; high-impedance when CS high or HOLD active. |
| 3 (WP) | Write-Protect Input | Hardware lock: disables all writes (array and STATUS) when pulled low; overrides WEL state per Table 2-4. |
| 4 (VSS) | Ground Reference | Return path for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling into SPI signals. |
| 5 (SI) | Serial Data Input | CMOS input: latches instructions, addresses, and data on rising SCK edge; requires VIH ≥ 0.7×VCC for reliable logic high. |
| 6 (SCK) | Serial Clock Input | Synchronous timing reference: defines data sampling (SI) and output update (SO) edges; max 10 MHz at 4.5–5.5V. |
| 7 (HOLD) | Hold Input | Pause control: suspends ongoing SPI transaction (e.g., mid-read) without resetting state; requires SCK low to activate. |
| 8 (VCC) | Supply Voltage | Power rail: powers internal logic, charge pump, and I/O buffers; bypass capacitor (0.1 µF) required near pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| EUI-64™ Node Address | Factory-programmed 8-byte IEEE-compliant identifier at 0xF8–0xFF - eliminates need for external MAC address provisioning in embedded Linux/RTOS stacks. |
| Hardware Write Protection | Dedicated WP pin (Pin 3) - provides fail-safe, board-level disable of all writes independent of firmware state or STATUS register settings. |
| HOLD Functionality | Interrupt-safe SPI suspension - allows host MCU to service higher-priority tasks without losing transaction context or reinitializing communication. |
| Block Write Protection | Configurable BP0/BP1 bits protect 0%, 25%, 50%, or 100% of memory - enables partitioning of protected identity space vs. writable user configuration area. |
| Low-Voltage Operation | Full functionality down to 1.8V - supports direct interfacing with ultra-low-power microcontrollers (e.g., PIC16LF, SAM L21) without level-shifting. |
Applications
| Industrial Ethernet Node | Wi-Fi IoT Sensor Hub |
|---|---|
|
Use Scenario: Factory-installed gateway connecting Modbus RTU field devices to cloud infrastructure via Ethernet. IC Role / Device Role / Timing Role: Stores immutable EUI-64™ MAC address used by Linux kernel during eth0 initialization and DHCP client ID generation. Use Value: Eliminates manual MAC assignment and prevents duplicate address conflicts in large-scale deployments with thousands of identical units. |
Use Scenario: Battery-powered environmental sensor transmitting temperature/humidity over TLS-secured Wi-Fi to AWS IoT Core. IC Role / Device Role / Timing Role: Holds pre-provisioned Wi-Fi SSID/password and device certificate fingerprint; accessed during boot before RF stack initialization. Use Value: Enables zero-touch provisioning with cryptographically bound identity, reducing field commissioning time and eliminating insecure plaintext credential storage. |
| Medical Diagnostic Device | Automated Test Equipment (ATE) |
|
Use Scenario: Portable ultrasound unit requiring FDA-compliant device serialization and calibration history logging. IC Role / Device Role / Timing Role: Stores unique UDI-DI (Device Identifier) in write-protected upper quarter (0xC0–0xFF) and retains last calibration timestamp in lower 192 bytes. Use Value: Meets 21 CFR Part 11 audit trail requirements by separating immutable identity from modifiable operational data using hardware-enforced BP bits. |
Use Scenario: Rack-mounted ATE system performing automated functional tests on PCBAs with traceable test result storage. IC Role / Device Role / Timing Role: Provides persistent, tamper-evident serial number and revision code for each test fixture; updated only during firmware upgrade. Use Value: Ensures test report integrity by binding results to fixture identity, preventing misattribution due to swapped or cloned test hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with factory-programmed node identity applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA02E48-I/SN | EUI-48™ (6-byte) address at 0xFA–0xFF; same pinout, timing, and package; 256-byte memory map identical except address location. | Used where IEEE 802.3/Ethernet MAC addressing suffices; lacks native EUI-64™ support for IPv6 autoconfiguration or Bluetooth LE. | Select when legacy MAC-only identity is sufficient and software encapsulation of EUI-48™ to EUI-64™ is acceptable. |
| AT24C02C-SSHM-T | Standard 2 Kbit I²C EEPROM (no factory-programmed address); 1 MHz max clock; no HOLD or WP pins; different interface and pinout. | Requires external MAC provisioning; lacks hardware write protection and interrupt-safe pause capability. | Choose only if I²C interface is mandated and EUI-64™ is not required; not drop-in compatible due to protocol and pin differences. |
Compared with 25AA02E64-I/SN, the 25AA02E48-I/SN offers identical form-factor and electrical behavior but delivers EUI-48™ instead of EUI-64™, while AT24C02C-SSHM-T sacrifices node identity, HOLD functionality, and SPI compatibility for cost-sensitive I²C designs lacking identity-critical requirements.
Availability
25AA02E64-I/SN is available at Aetrix Electronics and suitable for industrial Ethernet gateways, Wi-Fi IoT sensor hubs, medical diagnostic devices, and automated test equipment requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for 25AA02E64-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 leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.
The 25AA02E64-I/SN belongs to Microchip's serial EEPROM family designed specifically for secure, factory-programmed device identity in networked embedded systems - prioritizing IEEE compliance, low-power operation, and hardware-enforced data integrity.
FAQ
What is the factory-programmed address format for 25AA02E64-I/SN?
The 25AA02E64-I/SN contains a globally unique, IEEE-compliant EUI-64™ node address preprogrammed at memory locations 0xF8 through 0xFF. This 8-byte value consists of Microchip's OUI (first 3 bytes) followed by a 5-byte extension identifier, ensuring uniqueness across all deployed units without software intervention.
Does 25AA02E64-I/SN support SPI Mode 1,1 or only Mode 0,0?
The 25AA02E64-I/SN supports only SPI Mode 0,0 (CPOL = 0, CPHA = 0), as confirmed by Figure 1-2 and Section 2.1 of DS20002123G. Data is sampled on the rising edge of SCK and output changes on the falling edge; using Mode 1,1 will result in communication failure.
How does the HOLD pin function during an active read sequence in 25AA02E64-I/SN?
When HOLD is pulled low during an active read sequence, the 25AA02E64-I/SN immediately places SI, SO, and SCK in high-impedance state and pauses the transaction. The internal address pointer retains its position, allowing seamless resumption upon returning HOLD to high while SCK is low - critical for servicing real-time interrupts without data loss.
Can the factory-programmed EUI-64™ address in 25AA02E64-I/SN be overwritten?
Yes, but only after disabling write protection: the upper 1/4 of memory (0xC0–0xFF) containing the EUI-64™ address is protected by default via BP0=1/BP1=1 in the STATUS register. To overwrite it, issue WRSR to clear BP bits, then perform a page write - however, doing so invalidates IEEE compliance and is strongly discouraged.
What is the maximum write cycle time for a full 16-byte page in 25AA02E64-I/SN?
The maximum internal write cycle time for any operation - including single-byte or 16-byte page writes - is 5 ms, as specified in Table 1-3 (Parameter 20, TWC). This duration is fixed and independent of VCC or temperature; polling the WIP bit in the STATUS register is the recommended method to detect completion.
25AA02E64-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:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 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
25AA02E64-I/SN FAQ
1.How can I place an order for 25AA02E64-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA02E64-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 25AA02E64-I/SN reliable?
The price and inventory of 25AA02E64-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 25AA02E64-I/SN is usually 5 days.
3.What payment methods are accepted for 25AA02E64-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA02E64-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA02E64-I/SN?
25AA02E64-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA02E64-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 25AA02E64-I/SN?
For technical support, including 25AA02E64-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA02E64-I/SN requirements.
6.How does Aetrix verify that 25AA02E64-I/SN is sourced from the original manufacturer or authorized distributors?
All 25AA02E64-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 25AA02E64-I/SN meets industry standards.
7.What is the process for return or replacement of 25AA02E64-I/SN?
All 25AA02E64-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25AA02E64-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 25AA02E64-I/SN part is unused and in its original packaging.
Return procedure for 25AA02E64-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25AA02E64-I/SN Tags
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M24C02-WMN6TP
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