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Microchip Technology AT24MAC402-STUM-T
- Part No.:
- AT24MAC402-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24MAC402-STUM-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,115
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Product details
Overview
AT24MAC402-STUM-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-STUM-T datasheet, AT24MAC402-STUM-T pinout, AT24MAC402-STUM-T application, or AT24MAC402-STUM-T equivalent, this page delivers verified electrical parameters, confirmed EUI-48 read protocol behavior, validated 8-pin SOIC package mapping, exact memory organization (256 × 8), and real-world trade-offs among MAC-addressed EEPROM alternatives - all grounded in the official Atmel-8807E datasheet.
Technical Context
The AT24MAC402-STUM-T 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 array access and '1011' prefix for extended memory (EUI-48 and serial number). Its internal architecture separates the 2-Kbit user EEPROM (00h–FFh) from a dedicated, read-only extended memory block containing the 48-bit EUI address (9Ah–9Fh) and 128-bit serial number (80h–8Fh).
Write protection operates at three levels: hardware-based full-array lock via WP pin, permanent software lock of first-half (00h–7Fh), and reversible software lock of same region - each requiring distinct control byte sequences ('0110'/'01100010'/'01100110') and specific pin states (e.g., VHV ≥ 7V for RSWP). All write cycles are self-timed with max 5ms duration and include acknowledge polling support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8), fully usable user array - EUI and serial number reside in separate read-only extended memory block. |
| Interface | I²C-compatible 2-wire serial; supports 400 kHz at 1.7V and 1 MHz at 2.5V/5.0V - enables high-speed configuration loading in low-voltage IoT nodes. |
| EUI Address | EUI-48™ (48-bit), factory-programmed, permanently locked, stored at 9Ah–9Fh - provides globally unique hardware identity without host-side address generation logic. |
| Serial Number | 128-bit, factory-programmed, guaranteed unique across AT24CS/AT93CS/AT25S families, stored at 80h–8Fh - enables secure device binding and firmware anti-cloning. |
| Write Protection | Hardware (WP pin → VCC locks entire array); permanent & reversible software locks for first-half only - allows flexible, layered data security without external logic. |
| Endurance / Retention | 1,000,000 write cycles; 100-year data retention - suitable for infrequent but mission-critical parameter storage in industrial controllers. |
| Supply Range | 1.7V to 5.5V - interoperable with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
Pinout & Package
AT24MAC402-STUM-T is packaged in an 8-lead JEDEC SOIC (Small Outline Integrated Circuit) - a surface-mount, gull-wing leaded package measuring 4.9mm × 3.9mm × 1.75mm, RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hard-wired device address inputs | Enable up to eight devices on one I²C bus; values fixed per physical pin state - no floating inputs allowed in production design. |
| SDA | Serial Data I/O | Bidirectional, open-drain line requiring external pull-up; supports wire-OR with other I²C devices on same bus segment. |
| SCL | Serial Clock Input | Positive-edge clock-in, negative-edge clock-out; filtered and Schmitt-triggered for robust operation in noisy industrial environments. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes (reads remain functional); recommended pull-up ≤10 kΩ to avoid capacitive coupling errors. |
| GND | Ground Reference | System return path for VCC and signal lines; must be low-impedance connection to minimize ground bounce during write cycles. |
| VCC | Power Supply | 1.7V–5.5V operation; supply current peaks at 3.0 mA during 400 kHz writes - requires local 100 nF decoupling capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| EUI-48™ Address Integration | Factory-programmed, read-only 48-bit IEEE identifier stored outside main array - eliminates need for external MAC address storage or host-side generation logic. |
| Guaranteed Unique Serial Number | 128-bit value, permanently locked, shared uniqueness guarantee across Atmel serial EEPROM families - enables cryptographic key binding and counterfeit detection. |
| Dual-Mode Write Protection | Independent hardware (WP pin) and software (permanent/reversible registers) controls - permits selective locking of configuration vs. runtime data regions. |
| Extended Memory Access Protocol | Separate '1011' device address prefix for EUI/serial reads - prevents accidental overwrites and isolates identity data from user firmware updates. |
| Low-Voltage Operation | Full functionality down to 1.7V VCC - supports direct interfacing with battery-powered or energy-harvesting microcontrollers without voltage translation. |
Applications
| Network Interface Card (NIC) | Industrial Ethernet Module |
|---|---|
|
Use Scenario: Storing MAC address and board-specific calibration data on a PCIe or USB-connected NIC. IC Role / Device Role / Timing Role: Nonvolatile identity register and configuration store accessed during boot via I²C before PHY initialization. Use Value: Eliminates external MAC programming step; ensures IEEE-compliant EUI-48 is always present and tamper-resistant - reducing BOM count and manufacturing test time. |
Use Scenario: Providing unique node identity and firmware version tracking in DIN-rail mounted Ethernet I/O gateways. IC Role / Device Role / Timing Role: Secure serial number source for TLS certificate binding and EUI-48 for LLDP/CDP packet transmission. Use Value: Enables zero-touch provisioning and device attestation without cloud dependency - critical for air-gapped industrial networks. |
| Medical Diagnostic Sensor Hub | Smart Energy Meter |
|
Use Scenario: Holding device serial number, calibration coefficients, and regulatory compliance flags in FDA-cleared patient monitoring hardware. IC Role / Device Role / Timing Role: Tamper-evident identity and traceability store accessed during power-on self-test and audit log generation. Use Value: Meets IEC 62304 traceability requirements via immutable 128-bit serial number - simplifies regulatory documentation and field failure root-cause analysis. |
Use Scenario: Storing meter ID, tariff tables, and firmware signature keys in ANSI C12.22-compliant smart meters deployed in AMI networks. IC Role / Device Role / Timing Role: Cryptographic key material and EUI-48 source for DLMS/COSEM authentication and secure firmware updates. Use Value: Prevents cloning attacks using factory-locked identity - satisfies ANSI C12.22 Section 7.3.2.1 security mandates for endpoint uniqueness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar MAC-addressed EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24MAC602-STUM-T | Provides EUI-64™ (64-bit) instead of EUI-48™; identical 2-Kbit array, package, and protection features. | Required where IEEE 802.15.4, IPv6 autoconfiguration, or true EUI-64 format is mandated - no FFFEh insertion needed. | Select when EUI-64 native support is required; otherwise, AT24MAC402-STUM-T offers lower cost and smaller memory footprint for legacy MAC-48 use cases. |
| M95M02-DFMN6TP | 2-Mbit SPI EEPROM with no factory-programmed EUI or serial number; supports 5MHz SPI, 1.8V–5.5V, but lacks identity features. | Used where high-density storage is primary need and MAC address is managed externally (e.g., by MCU flash or secure element). | Choose only if identity management is handled elsewhere; M95M02-DFMN6TP cannot replace AT24MAC402-STUM-T's integrated EUI/serial functionality. |
Compared with AT24MAC602-STUM-T, AT24MAC402-STUM-T delivers EUI-48 compatibility with identical endurance and protection - ideal for legacy Ethernet stacks. Versus M95M02-DFMN6TP, it trades raw density for built-in identity assurance, eliminating host-side address generation and validation overhead.
Availability
AT24MAC402-STUM-T is available at Aetrix Electronics and suitable for industrial Ethernet modules, medical sensor hubs, smart energy meters, and network interface cards requiring stable component supply with guaranteed long-term availability.
Supply support for AT24MAC402-STUM-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 - a global leader in secure microcontrollers and nonvolatile memory solutions.
The AT24MAC series was designed specifically for embedded systems requiring cryptographically verifiable device identity and tamper-resistant configuration storage - targeting networking, industrial automation, and regulated medical applications.
FAQ
What is the exact memory organization of the AT24MAC402-STUM-T?
The AT24MAC402-STUM-T contains 2 Kbit (256 × 8) of user EEPROM organized as 16 pages of 16 bytes each (00h–7Fh for first-half, 80h–FFh for second-half). Separately, the extended memory block holds the 48-bit EUI-48 address (9Ah–9Fh) and 128-bit serial number (80h–8Fh), both factory-programmed and read-only. This layout ensures full 2-Kbit usability for application data while preserving identity integrity.
How is the EUI-48 address accessed on the AT24MAC402-STUM-T?
The EUI-48 address is read using a dedicated I²C device address prefix '1011' (Bh), followed by A2/A1/A0 bits and R/W = 1. It resides at memory addresses 9Ah–9Fh in the extended memory block. Unlike standard array reads, this requires explicit protocol adherence - no write operations are permitted, and the address pointer must be set via dummy write before reading. The AT24MAC402-STUM-T datasheet specifies this in Section 9 and Figure 7-1.
Does the AT24MAC402-STUM-T support both permanent and reversible software write protection?
Yes - the AT24MAC402-STUM-T supports both modes. Permanent Software Write Protection (PSWP) locks the first-half (00h–7Fh) irreversibly using control byte '0110' (6h) with WP = GND. Reversible Software Write Protection (RSWP) uses '01100010' (62h) to set and '01100110' (66h) to clear, but requires VHV ≥ 7V on A0 and specific A1/A2 states. Note: RSWP is unavailable on SOT23 packages due to missing A0–A2 pins.
What package type does the AT24MAC402-STUM-T use, and what are its dimensions?
The AT24MAC402-STUM-T uses an 8-lead JEDEC SOIC package (STUM suffix), measuring 4.9 mm × 3.9 mm × 1.75 mm with 1.27 mm lead pitch. It is RoHS-compliant, halide-free, and qualified for industrial temperature range (−40°C to +85°C). This package is pin-compatible with standard 8-pin SOIC footprints and supports reflow soldering per J-STD-020.
Can the AT24MAC402-STUM-T operate reliably at 1.7V supply voltage?
Yes - the AT24MAC402-STUM-T is fully specified for 1.7V to 5.5V operation. At 1.7V, it supports I²C communication up to 400 kHz, draws ≤1.0 mA during reads and ≤3.0 mA during writes, and maintains full write endurance (1M cycles) and data retention (100 years). Its Schmitt-triggered inputs and noise-filtered design ensure robustness in low-voltage battery-backed systems.
AT24MAC402-STUM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- 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:
- SOT-23-5
AT24MAC402-STUM-T FAQ
1.How can I place an order for AT24MAC402-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24MAC402-STUM-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-STUM-T reliable?
The price and inventory of AT24MAC402-STUM-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-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24MAC402-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24MAC402-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24MAC402-STUM-T?
AT24MAC402-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24MAC402-STUM-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-STUM-T?
For technical support, including AT24MAC402-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24MAC402-STUM-T requirements.
6.How does Aetrix verify that AT24MAC402-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24MAC402-STUM-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-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24MAC402-STUM-T?
All AT24MAC402-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24MAC402-STUM-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-STUM-T part is unused and in its original packaging.
Return procedure for AT24MAC402-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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