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Microchip Technology AT24MAC402-SSHM-T
- Part No.:
- AT24MAC402-SSHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24MAC402-SSHM-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:14,260
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Product details
Overview
AT24MAC402-SSHM-T 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-SSHM-T datasheet, AT24MAC402-SSHM-T pinout, AT24MAC402-SSHM-T application, or AT24MAC402-SSHM-T equivalent, key selection considerations include EUI-48 address persistence, dual software/hardware write protection modes, 16-byte page write capability, 1,000,000-cycle endurance, and compatibility with industrial temperature range (–40°C to +85°C) designs requiring traceable device identity.
Technical Context
The AT24MAC402-SSHM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and bidirectional data transfer protocol. Its memory is organized as 256 × 8 bits (2K), split into standard user-accessible array (00h–FFh) and extended read-only block containing EUI-48 (9Ah–9Fh) and 128-bit serial number (80h–8Fh).
Write protection operates at three levels: hardware-based (WP pin high disables all writes), permanent software (PSWP, irreversible lock of first-half array), and reversible software (RSWP, toggleable lock of first-half array). The device supports acknowledge polling during internal 5ms write cycles and requires no external components for basic operation beyond pull-up resistors on SDA/SCL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8), fully usable user array plus dedicated read-only extended block |
| Interface | I²C-compatible 2-wire serial; supports 400 kHz at 1.7V and 1 MHz at ≥2.5V |
| Supply Voltage | 1.7V to 5.5V - enables direct integration with low-voltage microcontrollers and battery-powered systems |
| Write Endurance | 1,000,000 cycles - ensures long-term reliability in firmware update or configuration logging applications |
| Data Retention | 100 years at 25°C - guarantees persistent storage of MAC address and serial number across product lifetime |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded deployments without derating |
| Write Cycle Time | Max 5 ms - defines minimum inter-write interval; supports acknowledge polling for timing control |
Pinout & Package
AT24MAC402-SSHM-T is packaged in an 8-lead JEDEC SOIC (SOIC-8) with standard pinout and footprint. This package supports automated assembly and provides mechanical robustness for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired address bits enabling up to eight devices on same I²C bus; A0–A2 values determine slave address prefix (1010xxx) |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up; carries address, data, and ACK/NACK signals |
| SCL | Serial Clock Input | Positive-edge clock input for data latching; negative-edge sampling for data output; filtered for noise immunity |
| WP | Hardware Write Protect | Active-high pin: logic high (VCC) blocks all writes to entire memory array regardless of software protection state |
| GND | Ground Reference | System common return path; required for proper biasing of internal circuitry and noise rejection |
| VCC | Power Supply | Primary supply rail (1.7–5.5V); powers EEPROM core, interface logic, and high-voltage pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| EUI-48™ MAC Address | Factory-programmed, permanently locked 48-bit IEEE-compliant identifier stored outside main array - eliminates need for external MAC provisioning |
| 128-bit Unique Serial Number | Guaranteed globally unique value shared across AT24CS/AT93CS/AT25S families - enables secure device authentication and BOM traceability |
| Dual Write Protection | Hardware (WP pin) + software (permanent/reversible registers) - allows flexible, layered data security for configuration vs. identity storage |
| Page Write Mode | 16-byte burst writes with automatic address increment - reduces I²C transaction overhead and improves firmware update efficiency |
| Green Packaging | RoHS-compliant, halide-free SOIC-8 - meets environmental compliance requirements without performance trade-offs |
Applications
| Network Interface Card (NIC) | Industrial IoT Gateway |
|---|---|
Use Scenario: Storing MAC address and device-specific credentials in Ethernet/Wi-Fi modules for plug-and-play network registration. IC Role / Device Role / Timing Role: Identity provisioning IC providing immutable EUI-48 and serial number to host MCU during boot sequence. Use Value: Eliminates external MAC programming step and prevents duplicate addresses in large-scale deployments due to guaranteed uniqueness. | Use Scenario: Securing edge node identity in time-sensitive industrial networks where firmware updates require verified device origin. IC Role / Device Role / Timing Role: Trusted identity anchor storing cryptographic keys and serial number used by secure boot and OTA update services. Use Value: Enables hardware-rooted device attestation using factory-provisioned, tamper-resistant identifiers - critical for zero-trust architectures. |
| Medical Diagnostic Equipment | Smart Energy Meter |
Use Scenario: Maintaining calibration history, service logs, and regulatory compliance records in FDA-cleared diagnostic instruments. IC Role / Device Role / Timing Role: Nonvolatile configuration and audit log storage IC with write-protected identity fields and user-accessible memory partition. Use Value: Ensures traceability of maintenance events and firmware versions while preserving immutable device ID for regulatory reporting. | Use Scenario: Storing utility-specific meter IDs, tariff tables, and tamper-detection logs in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure identity and parameter storage IC with hardware write protection preventing unauthorized configuration changes. Use Value: Meets ANSI/IEEE C12.19 and DLMS/COSEM requirements for protected, verifiable device identification and secure parameter storage. |
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 |
|---|---|---|---|
| AT24MAC602-SSHM-T | EUI-64 address (64-bit) instead of EUI-48; identical 2K memory, packaging, and protection features | Required for IPv6 autoconfiguration, 64-bit MAC-based protocols, or applications needing native EUI-64 without software conversion | Select when EUI-64 is mandated; otherwise AT24MAC402-SSHM-T offers lower-cost EUI-48 compliance with same footprint and pinout |
| AT24CS02-SSHM-T | No factory-programmed EUI or serial number; standard 2K I²C EEPROM with same SOIC-8 package and 1.7–5.5V operation | Suitable for general-purpose configuration storage where device identity is managed externally or not required | Choose when MAC address and serial number are unnecessary; reduces cost but removes hardware-enforced identity assurance |
Compared with AT24MAC602-SSHM-T, AT24MAC402-SSHM-T delivers EUI-48 compatibility at identical form factor and reliability, while AT24CS02-SSHM-T omits identity features entirely - making AT24MAC402-SSHM-T the optimal balance of cost, compliance, and embedded identity for Ethernet-connected industrial devices.
Availability
AT24MAC402-SSHM-T is available at Aetrix Electronics and suitable for industrial IoT gateways, medical diagnostics equipment, smart energy meters, and network interface cards requiring stable component supply with guaranteed long-term availability.
Supply support for AT24MAC402-SSHM-T 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, qualification, and support for the AT24MAC family of identity-enabled EEPROMs.
The AT24MAC series was designed specifically for embedded systems requiring IEEE-compliant MAC addressing and cryptographically verifiable device identity - targeting networking, industrial automation, and regulated medical applications.
FAQ
What is the primary function of the AT24MAC402-SSHM-T in a system design?
The AT24MAC402-SSHM-T serves as a trusted identity and configuration storage IC, providing a factory-programmed, read-only EUI-48 MAC address and guaranteed unique 128-bit serial number alongside 2K of user-programmable EEPROM. In system design, AT24MAC402-SSHM-T eliminates external MAC provisioning, enables secure device authentication, and supports tamper-resistant storage of calibration data, firmware version logs, and network credentials - all within a single SOIC-8 package.
Does the AT24MAC402-SSHM-T support both permanent and reversible write protection?
Yes, the AT24MAC402-SSHM-T supports three distinct write protection mechanisms: hardware protection via the WP pin (locks entire array), permanent software write protection (PSWP, irreversible lock of first-half array), and reversible software write protection (RSWP, toggleable lock of first-half array). All three operate independently and can be combined - for example, AT24MAC402-SSHM-T allows the EUI-48 and serial number regions (read-only extended block) to remain fully protected while permitting controlled writes to user-configurable sections of the main array.
How is the EUI-48 address accessed in the AT24MAC402-SSHM-T?
The EUI-48 address in AT24MAC402-SSHM-T is stored in read-only memory locations 9Ah–9Fh and accessed using a special I²C device address prefix '1011' (Bh) instead of the standard '1010' (Ah). The full 8-bit address byte is '1011 A2 A1 A0 1', where A2–A0 match the hard-wired pin states and the R/W bit is set to '1' for read. No write operation is possible - AT24MAC402-SSHM-T returns undefined data if a write attempt is made to this region, and the address is permanently locked at factory.
What package type does the AT24MAC402-SSHM-T use, and is it compatible with standard SOIC-8 footprints?
The AT24MAC402-SSHM-T uses an 8-lead JEDEC-standard SOIC (Small Outline Integrated Circuit) package, designated by the 'SS' in the part number. It is fully compatible with industry-standard SOIC-8 footprints (5.3mm width, 1.27mm pitch), supports reflow soldering per J-STD-020, and is RoHS-compliant and halide-free. This makes AT24MAC402-SSHM-T drop-in replaceable in existing designs using SOIC-8 EEPROMs without layout modification.
Can the AT24MAC402-SSHM-T be used in systems powered by 1.8V or 3.3V rails?
Yes, AT24MAC402-SSHM-T is fully specified for operation from 1.7V to 5.5V, making it compatible with 1.8V, 2.5V, 3.3V, and 5.0V logic systems. At 1.8V, it supports I²C communication up to 400kHz; at 3.3V or 5.0V, it supports up to 1MHz. Its low ICC1 (0.4–1.0mA read current at 5V) and ISB3 (6.0μA standby current at 5.5V) ensure minimal power impact - confirming AT24MAC402-SSHM-T is suitable for battery-backed and energy-constrained applications.
AT24MAC402-SSHM-T 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:
- 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-SOIC
AT24MAC402-SSHM-T FAQ
1.How can I place an order for AT24MAC402-SSHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24MAC402-SSHM-T 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-SSHM-T reliable?
The price and inventory of AT24MAC402-SSHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24MAC402-SSHM-T is usually 5 days.
3.What payment methods are accepted for AT24MAC402-SSHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24MAC402-SSHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24MAC402-SSHM-T?
AT24MAC402-SSHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24MAC402-SSHM-T 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-SSHM-T?
For technical support, including AT24MAC402-SSHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24MAC402-SSHM-T requirements.
6.How does Aetrix verify that AT24MAC402-SSHM-T is sourced from the original manufacturer or authorized distributors?
All AT24MAC402-SSHM-T 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-SSHM-T meets industry standards.
7.What is the process for return or replacement of AT24MAC402-SSHM-T?
All AT24MAC402-SSHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24MAC402-SSHM-T, 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-SSHM-T part is unused and in its original packaging.
Return procedure for AT24MAC402-SSHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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