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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT34C02D-MAHMHL-T

Name: AT34C02D-MAHMHL-T
Brand: Microchip Technology
SKU: AT34C02D-MAHMHL-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT34C02D-MAHMHL-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-UFDFN Exposed Pad

Datasheet:: AT34C02D-MAHMHL-T.pdf

Description:: IC EEPROM 2KBIT I2C 1MHZ 8UDFN

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Product details

Overview

AT34C02D-MAHMHL-T from Microchip Technology (formerly Atmel) is a JEDEC EE1002/EE1002A-compliant Serial Presence Detect (SPD) EEPROM for DDR/DDR2/DDR3 DIMM modules, delivering 2 Kbit (256 × 8) nonvolatile memory with I²C-compatible 2-wire interface, 1.7–5.5 V operation, and hardware/software write protection. It supports SPD functions in memory subsystems requiring reliable, low-voltage configuration storage.

For engineers reviewing the AT34C02D-MAHMHL-T datasheet, AT34C02D-MAHMHL-T pinout, AT34C02D-MAHMHL-T application, or AT34C02D-MAHMHL-T equivalent, key selection criteria include SPD compliance, dual software write protection modes (permanent and reversible), WP-pin-controlled full-array hardware protection, 16-byte page write capability, and industrial-grade UDFN packaging.

Technical Context

The AT34C02D-MAHMHL-T implements a dedicated SPD EEPROM architecture with fixed 256-word × 8-bit organization, optimized for DIMM module configuration data storage. Its I²C interface operates at 400 kHz (1.7–3.6 V) and 1 MHz (5.0 V), with Schmitt-triggered SCL/SDA inputs for noise immunity.

Write protection is implemented via three independent mechanisms: hardware-level WP pin control (full-array lock), permanent software write protect register (lower 128 bytes, irreversible), and reversible software write protect register (lower 128 bytes, programmable via specific command sequences). All protections coexist and are hierarchically enforced.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	2,048 bits (256 × 8), organized as 16 pages of 16 bytes - enables SPD data storage for DDR/DDR2/DDR3 DIMMs per JEDEC standard.
VCC Range	1.7 V to 5.5 V - supports wide-bus voltage compatibility across legacy and modern DIMM power rails.
I²C Speed	Up to 1 MHz at 5.0 V; 400 kHz at 1.7–3.6 V - ensures timing compliance with SPD read cycles during system boot.
Write Cycle Time	≤5 ms - defines minimum interval between write commands; critical for SPD initialization sequence timing.
Endurance	1,000,000 write cycles - guarantees long-term reliability for infrequent but mission-critical SPD updates.
Data Retention	100 years - ensures DIMM configuration integrity over full product lifecycle without refresh.
Operating Temp	−40°C to +85°C - qualified for industrial-grade memory module environments.

Pinout & Package

AT34C02D-MAHMHL-T is packaged in an 8-pad, 2.0 mm × 3.0 mm × 0.6 mm Ultra Thin Dual Flat No-Lead (UDFN) package (8MA2), with exposed thermal pad and laser-marked Pin 1 identifier on top surface.

Pin/Terminal	Circuit Role	Design Meaning
A0–A2	Hardware device address inputs	Enable up to eight AT34C02D devices on one I²C bus; must be hardwired to VCC or GND - floating states default to GND but are not recommended.
GND	Ground reference	Primary return path for VCC and signal currents; connects to PCB ground plane for noise suppression.
SDA	Serial data bidirectional line	Open-drain I²C data line requiring external pull-up; supports wire-OR with other open-drain devices on same bus.
SCL	Serial clock input	Positive-edge clock for data-in; negative-edge clock for data-out; Schmitt-triggered for robust noise rejection.
WP	Hardware write protect control	Direct logic-level control: tied to VCC → full-array write inhibit; tied to GND/floating → enables software protection modes.
VCC	Power supply input	Single-supply rail supporting 1.7–5.5 V; powers internal HV pump, timing circuitry, and I/O buffers.

Key Features

Feature	Design Value
JEDEC EE1002/EE1002A SPD Compliance	Fully satisfies DDR/DDR2/DDR3 DIMM serial presence detect requirements - eliminates need for custom SPD firmware or translation logic.
Dual Software Write Protection	Independent permanent (irreversible) and reversible registers for lower 128 bytes - allows secure factory programming and field-configurable protection.
Hardware WP Pin Control	Physical enable/disable of all writes regardless of software state - provides fail-safe protection against accidental or malicious overwrites.
16-Byte Page Write Mode	Enables burst programming of up to 16 bytes per write cycle - reduces SPD initialization time versus byte-by-byte writes.
Self-Timed Write Cycle	Internal timing engine completes erase/write in ≤5 ms without host CPU polling overhead - simplifies firmware integration.

Applications

DDR3 DIMM Configuration Storage	DDR2 Memory Module SPD
Use Scenario: Storing SPD data (module geometry, timing parameters, manufacturer info) on DDR3 UDIMMs for BIOS auto-configuration during POST. IC Role / Device Role / Timing Role: Dedicated SPD EEPROM providing JEDEC-standardized I²C-accessible configuration memory mapped to SMBus address 0x50. Use Value: Enables plug-and-play memory compatibility and eliminates manual BIOS memory timing setup.	Use Scenario: Supporting SPD functionality in DDR2 server DIMMs where extended temperature range and high write endurance are required. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during early boot via SMBus; operates reliably at −40°C to +85°C. Use Value: Ensures consistent memory initialization across industrial server deployments with thermal cycling.
Industrial DDR Memory Subsystems	Embedded Memory Module Calibration
Use Scenario: Providing SPD data for DDR memory used in ruggedized industrial controllers where voltage tolerance down to 1.7 V is essential. IC Role / Device Role / Timing Role: Low-voltage SPD EEPROM interfacing with host controller's SMBus peripheral; supports 400 kHz I²C at 1.7 V. Use Value: Maintains DIMM configuration integrity under brown-out conditions common in factory automation power systems.	Use Scenario: Storing calibrated timing offsets and vendor-specific memory parameters in embedded systems with soldered DDR modules. IC Role / Device Role / Timing Role: Secure, write-protected configuration store accessed only during manufacturing calibration or firmware update. Use Value: Prevents runtime corruption of critical memory tuning data using hardware WP and reversible software lock.

DDR3 DIMM Configuration Storage

DDR2 Memory Module SPD

Use Scenario: Storing SPD data (module geometry, timing parameters, manufacturer info) on DDR3 UDIMMs for BIOS auto-configuration during POST.

IC Role / Device Role / Timing Role: Dedicated SPD EEPROM providing JEDEC-standardized I²C-accessible configuration memory mapped to SMBus address 0x50.

Use Value: Enables plug-and-play memory compatibility and eliminates manual BIOS memory timing setup.

Use Scenario: Supporting SPD functionality in DDR2 server DIMMs where extended temperature range and high write endurance are required.

IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during early boot via SMBus; operates reliably at −40°C to +85°C.

Use Value: Ensures consistent memory initialization across industrial server deployments with thermal cycling.

Industrial DDR Memory Subsystems

Embedded Memory Module Calibration

Use Scenario: Providing SPD data for DDR memory used in ruggedized industrial controllers where voltage tolerance down to 1.7 V is essential.

IC Role / Device Role / Timing Role: Low-voltage SPD EEPROM interfacing with host controller's SMBus peripheral; supports 400 kHz I²C at 1.7 V.

Use Value: Maintains DIMM configuration integrity under brown-out conditions common in factory automation power systems.

Use Scenario: Storing calibrated timing offsets and vendor-specific memory parameters in embedded systems with soldered DDR modules.

IC Role / Device Role / Timing Role: Secure, write-protected configuration store accessed only during manufacturing calibration or firmware update.

Use Value: Prevents runtime corruption of critical memory tuning data using hardware WP and reversible software lock.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPD EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C02D-MAHM-T	Same 2 Kbit density and UDFN-8 package, but lacks JEDEC EE1002/EE1002A SPD compliance and permanent software write protection.	Intended for general-purpose I²C EEPROM use, not DIMM SPD - requires external firmware mapping to emulate SPD structure.	Select only if SPD compliance is unnecessary and cost sensitivity outweighs guaranteed JEDEC interoperability.
STMicroelectronics M24C02-RMN6TP	2 Kbit I²C EEPROM in TSSOP-8; supports 1 MHz I²C but no SPD-specific features, no permanent software write protection, and no reversible RSWP register.	Targeted at generic configuration storage; lacks SPD address map, timing, and protection schemes required for DIMM modules.	Choose when footprint flexibility (TSSOP vs UDFN) is prioritized and SPD compliance is handled externally.

Compared with AT24C02D-MAHM-T and M24C02-RMN6TP, the AT34C02D-MAHMHL-T uniquely delivers JEDEC-mandated SPD functionality, dual-mode software write protection, and hardware WP enforcement - making it the only drop-in solution for DDR/DDR2/DDR3 DIMM SPD implementation without firmware adaptation.

Availability

AT34C02D-MAHMHL-T is available at Aetrix Electronics and suitable for DDR3 DIMM manufacturing, DDR2 memory module refurbishment, and industrial embedded memory subsystems requiring stable component supply, long-lifecycle support, and JEDEC SPD compliance.

Supply support for AT34C02D-MAHMHL-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 support, qualification, and manufacturing continuity for the AT34C02D family.

The AT34C02D product line was designed specifically to meet JEDEC EE1002/EE1002A Serial Presence Detect requirements for DDR, DDR2, and DDR3 memory modules - emphasizing SPD-compliant timing, protection, and packaging for DIMM integration.

FAQ

Is AT34C02D-MAHMHL-T JEDEC EE1002A-compliant for DDR3 SPD applications?

Yes, the AT34C02D-MAHMHL-T is explicitly designed and qualified to JEDEC EE1002 and EE1002A standards for DDR, DDR2, and DDR3 DIMM Serial Presence Detect. Its memory map, I²C timing, and device addressing align with SPD requirements - enabling direct replacement in compliant DIMM designs without firmware modification. The AT34C02D-MAHMHL-T meets all mandatory SPD read/write timing and address allocation specifications defined in the JEDEC standard.

What is the function of the WP pin on AT34C02D-MAHMHL-T?

The WP (Write Protect) pin on AT34C02D-MAHMHL-T provides hardware-level write inhibition: when pulled to VCC, it disables all write operations to the entire 2 Kbit array regardless of software protection status. When tied to GND or left floating (internally pulled down), it enables software-based protection modes. This dual-layer protection ensures robust safeguarding of SPD data - critical for preventing accidental overwrites during system debug or field updates. The AT34C02D-MAHMHL-T datasheet specifies strict recommendations against leaving WP floating in production designs.

Does AT34C02D-MAHMHL-T support both permanent and reversible software write protection?

Yes, the AT34C02D-MAHMHL-T implements two distinct software write protection mechanisms. The permanent software write protect (PSWP) register, once programmed, irreversibly locks the lower 128 bytes (0x00–0x7F); the reversible software write protect (RSWP) register can be enabled or disabled via specific command sequences (0x62h and 0x66h) with appropriate A0–A2 pin states. Both operate independently of the WP pin state when WP = GND. This dual-mode scheme allows flexible security partitioning - factory-programmed constants in the protected region and field-updatable parameters in the unprotected region - within the AT34C02D-MAHMHL-T.

What package type does AT34C02D-MAHMHL-T use, and what are its key mechanical dimensions?

The AT34C02D-MAHMHL-T uses an 8-pad Ultra Thin Dual Flat No-Lead (UDFN) package designated 8MA2, measuring 2.0 mm × 3.0 mm × 0.6 mm with 0.5 mm pitch. It features a laser-marked Pin 1 indicator on the top surface and an orientation feature on the thermal pad underside. The package is RoHS-compliant, halogen-free, and uses NiPdAu lead finish (H-grade). Its compact footprint and thermal enhancement make it ideal for space-constrained DIMM PCB layouts - a key differentiator versus SOIC or TSSOP alternatives. The AT34C02D-MAHMHL-T package drawing is documented in Microchip's GPC-8MA2 specification.

Can AT34C02D-MAHMHL-T operate at 1.7 V while maintaining full I²C functionality?

Yes, the AT34C02D-MAHMHL-T is fully functional across 1.7 V to 5.5 V, including I²C communication at 400 kHz down to 1.7 V. Its Schmitt-triggered SCL and SDA inputs ensure noise immunity at low voltages, and DC characteristics (e.g., VOL1 = 0.2 V at IOL = 0.15 mA, ISB1 = 1.0 μA standby current) are specified and tested at 1.7 V. This capability enables reliable SPD operation in low-power DDR memory subsystems and brown-out scenarios - a design requirement explicitly validated for the AT34C02D-MAHMHL-T in Microchip's characterization reports.

AT34C02D-MAHMHL-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-UFDFN Exposed Pad

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:: -

Voltage - Supply:: 1.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-UDFN (2x3)

AT34C02D-MAHMHL-T FAQ

1.How can I place an order for AT34C02D-MAHMHL-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT34C02D-MAHMHL-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 AT34C02D-MAHMHL-T reliable?

The price and inventory of AT34C02D-MAHMHL-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02D-MAHMHL-T is usually 5 days.

3.What payment methods are accepted for AT34C02D-MAHMHL-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02D-MAHMHL-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT34C02D-MAHMHL-T?

AT34C02D-MAHMHL-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT34C02D-MAHMHL-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 AT34C02D-MAHMHL-T?

For technical support, including AT34C02D-MAHMHL-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02D-MAHMHL-T requirements.

6.How does Aetrix verify that AT34C02D-MAHMHL-T is sourced from the original manufacturer or authorized distributors?

All AT34C02D-MAHMHL-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 AT34C02D-MAHMHL-T meets industry standards.

7.What is the process for return or replacement of AT34C02D-MAHMHL-T?

All AT34C02D-MAHMHL-T units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02D-MAHMHL-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 AT34C02D-MAHMHL-T part is unused and in its original packaging.

Return procedure for AT34C02D-MAHMHL-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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