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Microchip Technology AT24MAC402-XHM-B
- Part No.:
- AT24MAC402-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24MAC402-XHM-B.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
AT24MAC402-XHM-B from Microchip Technology (formerly Atmel) is a 2-Kbit I²C-compatible serial EEPROM with factory-programmed EUI-48™ MAC address and guaranteed unique 128-bit serial number, operating from 1.7V to 5.5V, supporting 400kHz (1.7V) and 1MHz (2.5V/5.0V) bus speeds, and featuring hardware write protection via WP pin for full-array data integrity in networked embedded systems.
For engineers reviewing the AT24MAC402-XHM-B datasheet, AT24MAC402-XHM-B pinout, AT24MAC402-XHM-B application, or AT24MAC402-XHM-B equivalent, this page delivers verified electrical specs, validated pin functions, confirmed EUI-48 and serial number access protocol, real-world write protection behavior (hardware WP + reversible/PSWP software modes), and precise package mapping to 8-lead SOIC.
Technical Context
The AT24MAC402-XHM-B implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports standard 7-bit device addressing with '1010' prefix for main memory and '1011' prefix for extended memory (EUI-48 and serial number). It uses an internal high-voltage pump for EEPROM programming and integrates dedicated read-only memory blocks outside the 256×8 main array.
Its memory architecture separates standard user EEPROM (00h–FFh) into first-half (00h–7Fh, software-write-protectable) and second-half (80h–FFh), while reserving extended address space (80h–9Fh) for immutable 48-bit EUI (9Ah–9Fh) and 128-bit serial number (80h–8Fh), both factory-programmed and permanently locked.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8 bits), organized as 16 pages of 16 bytes - enables efficient page-write optimization in firmware updates. |
| Interface | I²C-compatible 2-wire serial - interoperable with standard microcontroller I²C peripherals without protocol translation. |
| Supply Voltage | 1.7V to 5.5V - supports direct integration into battery-powered, industrial, and mixed-voltage systems without level-shifting. |
| Max Clock Frequency | 400 kHz at 1.7V; 1 MHz at ≥2.5V - ensures timing compliance across wide VCC range without external clock scaling. |
| EUI Address | Factory-programmed, read-only 48-bit EUI-48 stored at 9Ah–9Fh - provides globally unique IEEE-compliant MAC identifier for network stack initialization. |
| Serial Number | Guaranteed unique 128-bit factory serial number stored at 80h–8Fh - enables secure device identity binding and anti-cloning in certified deployments. |
| Write Endurance | 1,000,000 cycles - supports frequent configuration logging or calibration storage in field-deployed equipment. |
| Data Retention | 100 years at 25°C - ensures long-term reliability for infrastructure devices with multi-decade service life. |
Pinout & Package
AT24MAC402-XHM-B is packaged in an 8-lead JEDEC-standard SOIC (Small Outline Integrated Circuit), pin-compatible with industry-standard PCB footprints and reflow profiles. The package supports automated assembly and meets RoHS, halogen-free, and green manufacturing requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hard-wired device address inputs | Set static I²C slave address (up to 8 devices on one bus); A0=A1=A2=0 yields 0x50 base address for main memory access. |
| SDA | Bi-directional serial data line | Open-drain I²C data I/O requiring external pull-up; supports wire-OR with other I²C devices on same bus. |
| SCL | Serial clock input | Positive-edge sampled clock; controls timing of all read/write transfers and acknowledges. |
| WP | Hardware write protect control | Pull to VCC to inhibit all writes (read-only mode); pull to GND or float for full read/write capability. |
| GND | Ground reference | Primary return path for VCC and signal currents; must be low-impedance for noise immunity. |
| VCC | Power supply | Accepts 1.7–5.5V; powers internal logic, EEPROM array, and high-voltage pump for write operations. |
Key Features
| Feature | Design Value |
|---|---|
| EUI-48 address storage | Factory-programmed, permanently locked 48-bit IEEE MAC address in dedicated read-only memory block - eliminates need for external MAC provisioning or insecure software storage. |
| 128-bit unique serial number | Atmel-guaranteed unique value across AT24CS/AT93CS/AT25S families, stored separately from main array - enables cryptographic key binding and traceability without consuming user memory. |
| Hardware + software write protection | WP pin protects entire 2K array; reversible software protection secures first-half (00h–7Fh); permanent software protection locks first-half irreversibly - supports layered security policies. |
| Page write capability | 16-byte page writes with automatic address incrementing within page boundary - reduces I²C transaction count during bulk configuration saves. |
| Noise-immune interface | Schmitt-trigger inputs with 100 ns noise suppression (1.7V) and 50 ns (2.5V/5.0V) - maintains reliable communication in electrically noisy industrial environments. |
| Low-power standby | 1.0 μA max at 1.7V VCC - extends battery life in always-on edge sensors and portable diagnostic tools. |
Applications
| Network Interface Card (NIC) | Industrial Ethernet Gateway |
|---|---|
Use Scenario: Storing MAC address and boot-time configuration for wired Ethernet PHY initialization. IC Role / Device Role / Timing Role: Provides factory-assigned, tamper-proof EUI-48 address and persistent network settings during power-on reset sequence. Use Value: Eliminates host MCU firmware dependency for MAC assignment and prevents duplicate address conflicts in large-scale deployments. |
Use Scenario: Securing unique identity and firmware version metadata in DIN-rail mounted gateways connecting legacy PLCs to cloud platforms. IC Role / Device Role / Timing Role: Supplies cryptographically bound 128-bit serial number for device attestation and stores write-protected calibration offsets for analog I/O modules. Use Value: Enables zero-touch onboarding in IoT platforms and satisfies industrial cybersecurity requirements for device provenance and firmware integrity. |
| Medical Diagnostic Sensor Hub | Smart Energy Meter |
Use Scenario: Recording device-specific calibration coefficients and regulatory compliance flags in FDA-cleared patient monitoring hardware. IC Role / Device Role / Timing Role: Stores immutable serial number and time-stamped calibration data in write-protected memory regions accessible only after hardware WP deactivation. Use Value: Meets IEC 62304 traceability mandates and supports audit-ready revision history without risking accidental overwrites. |
Use Scenario: Holding metering constants, tariff tables, and tamper-detection logs in ANSI C12.22-compliant utility meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: Provides 100-year data retention for billing parameters and leverages hardware WP to prevent unauthorized firmware or tariff modifications. Use Value: Ensures revenue-grade accuracy over 20+ year field life and complies with utility anti-tampering standards (e.g., ANSI C12.10). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with MAC address applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24MAC402-SSHM-B | Same die, TSSOP-8 package (3.0 × 4.4 mm) vs. SOIC-8 (3.9 × 4.9 mm); identical EUI-48, serial number, and electrical specs. | Preferred for space-constrained PCBs where footprint area and height are critical; requires different land pattern and stencil design. | Select when board real estate is limited and TSSOP reflow compatibility is confirmed. |
| AT24MAC602-XHM-B | Same SOIC-8 package but provides factory-programmed 64-bit EUI-64 (vs. 48-bit); identical 2K memory, write protection, and voltage range. | Required for IPv6 autoconfiguration (SLAAC), Zigbee 3.0, or Thread networks needing native EUI-64; no post-read FFFE insertion needed. | Select when EUI-64 is mandated by protocol stack or future-proofing against IPv6-only infrastructure. |
Compared with AT24MAC402-SSHM-B, the AT24MAC402-XHM-B offers larger SOIC-8 footprint for easier hand-soldering and thermal dissipation; compared with AT24MAC602-XHM-B, it delivers lower-cost EUI-48 support ideal for legacy Ethernet and Wi-Fi MAC layer use cases without EUI-64 dependency.
Availability
AT24MAC402-XHM-B is available at Aetrix Electronics and suitable for industrial Ethernet gateways, medical sensor hubs, and smart energy meters requiring stable component supply, long-lifecycle assurance, and guaranteed factory-programmed identity features.
Supply support for AT24MAC402-XHM-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 acquired Atmel in 2016 and maintains full product continuity, technical documentation, and qualification for the AT24MAC family of secure serial EEPROMs.
The AT24MAC402-XHM-B belongs to Microchip's MAC-address-enabled EEPROM product line, designed specifically to simplify regulatory-compliant device identity management in networked embedded systems without external provisioning infrastructure.
FAQ
What is the factory-programmed EUI-48 address format used in the AT24MAC402-XHM-B?
The AT24MAC402-XHM-B contains a factory-programmed 48-bit EUI-48 address stored in read-only memory at addresses 9Ah–9Fh. It consists of a 24-bit Organizationally Unique Identifier (OUI = FCC23Dh assigned to Atmel) followed by a 24-bit Extension Identifier, guaranteeing global uniqueness. The AT24MAC402-XHM-B does not support runtime modification of this value.
How is the 128-bit serial number accessed and protected in the AT24MAC402-XHM-B?
The AT24MAC402-XHM-B stores its guaranteed unique 128-bit serial number in the extended memory block at addresses 80h–8Fh. Access requires initiating an I²C transaction with device address prefix '1011' (0xB0) and R/W bit = 1. This serial number is factory-programmed and permanently write-protected - no command or voltage condition can alter it after shipment.
Can the AT24MAC402-XHM-B be used in 1.8V systems, and what is its minimum operating voltage?
Yes, the AT24MAC402-XHM-B operates down to 1.7V VCC, making it fully compatible with 1.8V systems. Its I²C interface supports 400kHz clocking at 1.7V and scales to 1MHz at 2.5V and above. All DC and AC specifications - including VOL, VIH, and tWR - are characterized and guaranteed across the full 1.7V–5.5V range.
What write protection mechanisms does the AT24MAC402-XHM-B support, and how do they interact?
The AT24MAC402-XHM-B supports three independent write protection layers: (1) hardware protection via WP pin (VCC = full-array lock), (2) reversible software protection (first-half only, toggleable via 0x62/0x66 commands), and (3) permanent software protection (first-half only, irreversible via 0x60 command). WP = VCC overrides all software protections and disables their programming.
Is the AT24MAC402-XHM-B pin-compatible with standard 2K I²C EEPROMs like the AT24C02?
Yes, the AT24MAC402-XHM-B uses the same 8-lead SOIC package and identical pinout (A0–A2, SDA, SCL, WP, GND, VCC) as AT24C02-series devices. Its I²C device address prefix is '1010', matching standard 2K EEPROMs - enabling drop-in replacement in existing designs, provided EUI/serial number access and WP pin usage are accounted for in firmware.
AT24MAC402-XHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24MAC402-XHM-B FAQ
1.How can I place an order for AT24MAC402-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24MAC402-XHM-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 AT24MAC402-XHM-B reliable?
The price and inventory of AT24MAC402-XHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24MAC402-XHM-B is usually 5 days.
3.What payment methods are accepted for AT24MAC402-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24MAC402-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24MAC402-XHM-B?
AT24MAC402-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24MAC402-XHM-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 AT24MAC402-XHM-B?
For technical support, including AT24MAC402-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24MAC402-XHM-B requirements.
6.How does Aetrix verify that AT24MAC402-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24MAC402-XHM-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 AT24MAC402-XHM-B meets industry standards.
7.What is the process for return or replacement of AT24MAC402-XHM-B?
All AT24MAC402-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24MAC402-XHM-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 AT24MAC402-XHM-B part is unused and in its original packaging.
Return procedure for AT24MAC402-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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