My Inquiry
My Account
Microchip Technology 25AA02E48T-I/OT
- Part No.:
- 25AA02E48T-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
25AA02E48T-I/OT.pdf
- Description:
- IC EEPROM 2KBIT SPI SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:10,579
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
25AA02E48T-I/OT from Microchip Technology is a 2 Kbit SPI serial EEPROM with factory-programmed EUI-48™ node address, 1.8–5.5 V supply range, 10 MHz max clock frequency, and 6-lead SOT-23 package. It provides globally unique 48-bit MAC addressing for Ethernet/Wi-Fi nodes and supports write protection, hold functionality, and industrial temperature operation (–40°C to +85°C).
For engineers reviewing the 25AA02E48T-I/OT datasheet, 25AA02E48T-I/OT pinout, 25AA02E48T-I/OT application, or 25AA02E48T-I/OT equivalent, this device serves as a secure, low-power identity storage solution in networked embedded systems requiring IEEE-compliant node addressing, SPI-compatible nonvolatile memory, and hardware write protection.
Technical Context
The 25AA02E48T-I/OT implements a standard SPI Mode 0,0 interface with separate SI/SO lines, CS-controlled selection, and HOLD-driven pause capability. Its internal architecture includes an 8-bit instruction register, page latches for 16-byte writes, and a STATUS register with WIP, WEL, BP0/BP1 bits for real-time write status and block protection control.
Factory-programmed EUI-48™ data resides at addresses 0xFA–0xFF and is protected by default via BP1=0/BP0=1 configuration, locking the upper 1/4 array (0xC0–0xFF). The device uses self-timed erase/write cycles (≤5 ms), supports sequential read with automatic address wraparound, and enforces write enable latch (WREN/WRDI) discipline for data integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 × 8-bit (2 Kbit) EEPROM array; sufficient for MAC address + user configuration data |
| Interface | SPI-compatible serial bus (Mode 0,0); requires only CS, SCK, SI, SO, WP, HOLD, VCC, VSS |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V; enables fast host communication without external timing components |
| Write Cycle Time | ≤5 ms per byte or page; deterministic timing simplifies firmware polling and timeout handling |
| Endurance & Retention | 1,000,000 erase/write cycles; >200 years data retention - suitable for long-life industrial deployments |
| Supply Voltage Range | 1.8 V to 5.5 V; interoperable with 1.8 V logic, 3.3 V microcontrollers, and 5 V legacy systems |
| Operating Temperature | –40°C to +85°C (Industrial grade); validated across full range for reliable field operation |
Pinout & Package
25AA02E48T-I/OT is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (body size 2.9 mm × 1.6 mm × 1.1 mm), optimized for space-constrained PCB layouts in networking and IoT edge devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCK) | Serial Clock Input | Synchronizes all SPI transfers; data latched on rising edge, SO updated after falling edge |
| 2 (VSS) | Ground Reference | Common return path for all digital and power currents; must be low-impedance for noise immunity |
| 3 (SI) | Serial Data Input | Receives instructions (e.g., READ, WREN), addresses, and write data MSb-first |
| 4 (SO) | Serial Data Output | Drives read data MSb-first; tri-states when CS high or HOLD low to avoid bus contention |
| 5 (CS) | Chip Select Input | Active-low enable; initiates internal write cycle on rising edge after valid write sequence |
| 6 (VCC) | Supply Voltage | Power input (1.8–5.5 V); powers internal HV generator for EEPROM programming |
Key Features
| Feature | Design Value |
|---|---|
| EUI-48™ Node Address | Factory-programmed, globally unique 48-bit IEEE MAC address stored at 0xFA–0xFF; eliminates need for external provisioning |
| Hardware Write Protection | WP pin disables all writes regardless of WEL state; prevents corruption during power transients or firmware faults |
| HOLD Functionality | Pauses ongoing SPI transfer without resetting internal state; allows host to service higher-priority interrupts mid-sequence |
| Block Write Protection | BP0/BP1 bits enable selective lock of none, 1/4, 1/2, or full memory array - protects identity region while allowing user data updates |
| Low-Power Operation | 1 µA standby current at 2.5 V/85°C; supports battery-powered or energy-harvesting edge nodes |
Applications
| Network Interface Cards (NICs) | Wi-Fi Access Points |
|---|---|
Use Scenario: Storing immutable MAC address and vendor-specific configuration in wired Ethernet PHY interfaces. IC Role / Device Role / Timing Role: Nonvolatile identity storage element interfacing directly with MAC controller via SPI. Use Value: Eliminates external MAC address programming step during manufacturing; ensures IEEE compliance and traceability. | Use Scenario: Providing unique node identity and runtime configuration storage in 802.11a/b/g/n access point modules. IC Role / Device Role / Timing Role: Secure SPI EEPROM holding EUI-48™ address and calibration data for RF subsystems. Use Value: Enables plug-and-play deployment with guaranteed uniqueness; supports field-upgradable settings without reprogramming. |
| Industrial IoT Gateways | Smart Energy Meters |
Use Scenario: Hosting device identity and secure boot parameters in protocol-agnostic edge gateways connecting Modbus, CAN, and MQTT networks. IC Role / Device Role / Timing Role: Trusted identity anchor with hardware write-protection for firmware integrity verification. Use Value: Prevents tampering of node ID during over-the-air updates; meets IEC 62443-3-3 requirements for secure device onboarding. | Use Scenario: Storing meter serial number, calibration coefficients, and utility-specific credentials in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Tamper-resistant EEPROM with ESD-hardened I/O (4 kV HBM) for harsh metering environments. Use Value: Ensures lifetime validity of billing-critical identifiers; withstands repeated hot-plug events and voltage sags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with preprogrammed node identity applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA02E48T-I/SN | Same EUI-48™ content and electrical specs, but in 8-lead SOIC package (5.0 × 3.9 mm vs. 2.9 × 1.6 mm) | Preferred where board space permits and hand-soldering or legacy footprint compatibility is required | Select for ease of prototyping or compatibility with existing SOIC-based designs |
| 25AA02E64T-I/OT | Identical package and pinout, but factory-programmed with EUI-64™ (8-byte) address instead of EUI-48™ | Required for IPv6 autoconfiguration, Zigbee 3.0, or Bluetooth LE mesh where 64-bit extended address is mandated | Select when system software requires native EUI-64™ without encapsulation logic |
Compared with 25AA02E48T-I/SN, the 25AA02E48T-I/OT saves >70% board area; compared with 25AA02E64T-I/OT, it delivers identical footprint and reliability but targets EUI-48™-centric protocols like classic Ethernet and Wi-Fi 4/5.
Availability
25AA02E48T-I/OT is available at Aetrix Electronics and suitable for network interface cards, Wi-Fi access points, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and guaranteed EUI-48™ uniqueness.
Supply support for 25AA02E48T-I/OT 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 25AA02EXX product line delivers factory-programmed, standards-compliant node identity storage for embedded networking applications, targeting seamless IEEE address integration without host CPU overhead or external programming infrastructure.
FAQ
What is the factory-programmed address format for 25AA02E48T-I/OT?
The 25AA02E48T-I/OT contains a globally unique, IEEE-compliant EUI-48™ address prewritten to memory locations 0xFA–0xFF. This 6-byte value consists of a Microchip-assigned OUI (first three bytes) and a unique extension identifier (last three bytes), enabling immediate use as a MAC address without host-side provisioning. The 25AA02E48T-I/OT does not support EUI-64™ natively.
Does 25AA02E48T-I/OT require external pull-up resistors on SPI lines?
No, the 25AA02E48T-I/OT does not require external pull-ups on SI, SO, or SCK. Its inputs meet standard CMOS thresholds (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), and SO is actively driven or tri-stated - no weak pull-up is needed. Pull-ups may be added only if shared bus arbitration or noise immunity in long traces demands them, but they are not specified in the 25AA02E48T-I/OT datasheet.
How is write protection enforced on the EUI-48™ address region in 25AA02E48T-I/OT?
At power-on, the 25AA02E48T-I/OT's STATUS register is factory-configured with BP1=0 and BP0=1, write-protecting addresses 0xC0–0xFF - which includes the EUI-48™ region (0xFA–0xFF). This protection persists until explicitly cleared via WRSR instruction. The WP pin provides additional hardware-level lockout, disabling all writes regardless of BP bit state.
Can 25AA02E48T-I/OT operate reliably at 1.8 V supply?
Yes, the 25AA02E48T-I/OT is fully specified for 1.8 V operation: maximum clock frequency is 3 MHz, ICCREAD is ≤2.5 mA at 5 MHz, and all DC/AC characteristics including setup/hold times are guaranteed across –40°C to +85°C. This makes the 25AA02E48T-I/OT suitable for ultra-low-power 1.8 V microcontroller systems without level-shifting.
What happens to the 25AA02E48T-I/OT during a power brownout?
The 25AA02E48T-I/OT includes built-in power-on/off data protection circuitry that inhibits writes when VCC drops below the functional threshold (~1.5 V). The write enable latch resets automatically on power-up, and the STATUS register retains its BP bit configuration. No data corruption occurs during brownouts, and the 25AA02E48T-I/OT resumes normal operation once VCC stabilizes within 1.8–5.5 V.
25AA02E48T-I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-6
25AA02E48T-I/OT FAQ
1.How can I place an order for 25AA02E48T-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA02E48T-I/OT 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 25AA02E48T-I/OT reliable?
The price and inventory of 25AA02E48T-I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA02E48T-I/OT is usually 5 days.
3.What payment methods are accepted for 25AA02E48T-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA02E48T-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA02E48T-I/OT?
25AA02E48T-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA02E48T-I/OT 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 25AA02E48T-I/OT?
For technical support, including 25AA02E48T-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA02E48T-I/OT requirements.
6.How does Aetrix verify that 25AA02E48T-I/OT is sourced from the original manufacturer or authorized distributors?
All 25AA02E48T-I/OT 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 25AA02E48T-I/OT meets industry standards.
7.What is the process for return or replacement of 25AA02E48T-I/OT?
All 25AA02E48T-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 25AA02E48T-I/OT, 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 25AA02E48T-I/OT part is unused and in its original packaging.
Return procedure for 25AA02E48T-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25AA02E48T-I/OT Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
