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STMicroelectronics M34E04-FMC9TG
- Part No.:
- M34E04-FMC9TG
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
M34E04-FMC9TG.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8UFDFPN
- Quantity:
- Payment:
- Shipping:
Inventory:10,807
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Product details
Overview
M34E04-FMC9TG from STMicroelectronics is a JEDEC EE1004-compliant 4-Kbit Serial Presence Detect (SPD) EEPROM designed for DDR4 DRAM module configuration storage. It provides 512 bytes of nonvolatile memory organized as two 256-byte pages, each split into two 128-byte blocks, with per-block software write protection. Operating on SMBus at up to 1 MHz (2.2–3.6 V), it supports VCC from 1.7 V to 3.6 V and functions across 0 °C to +95 °C ambient - deployed in server memory modules to store timing, capacity, and vendor data.
For engineers reviewing the M34E04-FMC9TG datasheet, M34E04-FMC9TG pinout, M34E04-FMC9TG application in DDR4 SPD systems, or M34E04-FMC9TG equivalent for JEDEC-compliant memory configuration storage, this page delivers verified electrical specs, terminal-level interface behavior, real-world DIMM integration context, and validated alternatives aligned with SMBus timing and block-protection requirements.
Technical Context
The M34E04 implements an I²C-compatible SMBus slave interface with dedicated DTIC addressing (1010b for SPD read/write, 0110b for protection control). Its internal logic decodes SA2–SA0 for device selection and uses SA0's VHV detection capability to enable SWP/CWP commands - requiring >2.5 V on SA0 to activate write-protection programming sequences.
Memory access follows strict page-based addressing: a SPA0/SPA1 command selects either lower or upper 256-byte page before subsequent EE read/write operations. Protection status is verified via RPSn commands returning ACK (unprotected) or NACK (protected), enabling runtime validation without destructive reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbits (512 bytes), organized as two 256-byte pages - matches JEDEC EE1004 SPD layout for DDR4 DIMMs. |
| Interface | SMBus 1.1 compatible, up to 1 MHz max clock rate (2.2–3.6 V range) - ensures compatibility with DDR4 memory controller SMBus masters. |
| Write speed | Byte Write ≤ 5 ms; Page Write (16 bytes) ≤ 5 ms - enables fast SPD programming during module manufacturing or field updates. |
| Voltage range | 1.7 V to 3.6 V supply - supports low-voltage DDR4 systems and backward compatibility with 3.3 V DIMM slots. |
| Temperature range | 0 °C to +95 °C operating - certified for use inside memory modules under sustained server thermal loads. |
| Data retention | 200+ years - guarantees SPD data integrity over full product lifecycle without refresh. |
| Endurance | 4 million write cycles per block - supports repeated reprogramming during module qualification and firmware updates. |
Pinout & Package
Supplied in UFDFPN8 (ECOPACK2®) ultra-thin fine-pitch dual flat no-lead package: 2 mm × 3 mm, 0.5 mm pitch, exposed pad, RoHS/halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input | 1.7–3.6 V power rail; requires local 10–100 nF decoupling capacitor near pins for stable SMBus operation. |
| VSS | Ground reference | Return path for all digital and I/O circuits; must be low-impedance connection to system ground plane. |
| SCL | Serial clock input | Master-generated clock signal; device enters Standby mode if held low ≥ tTIMEOUT (see AC specs). |
| SDA | Serial data bidirectional I/O | Open-drain output; requires external pull-up resistor (value determined by bus capacitance and 1 MHz timing). |
| SA2, SA1, SA0 | Slave address inputs | Set 3-bit address portion of 7-bit DTIC; SA0 also detects VHV (>2.5 V) for protection command execution. |
| WC | Hardware write control | Active-low global write enable; when high, overrides software protection and disables all writes to memory array. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC EE1004 compliance | Fully implements SPD data structure and SMBus protocol for DDR4 DIMM plug-and-play recognition by host BIOS/UEFI. |
| Per-block software write protection | Four independent 128-byte blocks can be locked/unlocked via SMBus commands (SWPn/CWP), preventing accidental SPD corruption. |
| Noise-immune bus interface | Schmitt-trigger and digital noise filtering on SCL/SDA ensure robust operation in electrically noisy server memory channels. |
| Backward compatibility with M34E02 | Supports legacy page-selection logic and DTIC encoding, enabling drop-in replacement in existing DDR3/DDR4 designs. |
| Enhanced ESD/latch-up immunity | Withstands >4 kV HBM ESD and robust latch-up immunity - critical for handling during DIMM assembly and field service. |
Applications
| DDR4 Server Memory Modules | Registered DIMMs (RDIMMs) |
|---|---|
|
Use Scenario: Storing JEDEC-defined SPD data (timing parameters, module density, manufacturer ID) on DDR4 UDIMMs used in cloud infrastructure servers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage element interfacing directly with memory controller's SMBus port during boot-time enumeration. Use Value: Enables automatic memory initialization without hardcoded BIOS tables; supports multi-vendor DIMM interoperability in white-box servers. |
Use Scenario: Providing SPD data for RDIMMs with registered address/control buffers in enterprise workstations and blade servers. IC Role / Device Role / Timing Role: SMBus slave holding JEDEC-mandated SPD byte map; accessed only during power-on reset sequence before memory training. Use Value: Ensures RCD (Register Clock Driver) and DRAM devices are configured with correct tCK, CAS latency, and burst length per JEDEC spec. |
| LRDIMMs (Load-Reduced DIMMs) | Memory Module Manufacturing Test |
|
Use Scenario: Storing extended SPD extensions (e.g., thermal sensor mapping, RAS features) for LRDIMMs in high-density compute nodes. IC Role / Device Role / Timing Role: SPD EEPROM integrated into LRDIMM PCB alongside buffer ICs; accessed via SMBus for dynamic configuration updates. Use Value: Supports hot-plug SPD updates and field-programmable module identification without requiring physical rework. |
Use Scenario: Automated programming of SPD contents during post-assembly burn-in and functional testing of memory modules. IC Role / Device Role / Timing Role: Target device for industrial-grade SMBus programmers; leverages fast 5 ms page writes and ACK polling for throughput optimization. Use Value: Reduces test cycle time by >30% vs. legacy 2-Kbit SPD parts due to dual-page architecture and parallel block programming support. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPD EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C04C-SSHM-T (Microchip) | 4-Kbit I²C EEPROM, but not JEDEC EE1004-compliant; lacks DTIC addressing, SPA/RPS commands, and VHV-based protection. | Requires custom firmware to emulate SPD layout; unsuitable for BIOS auto-detection in standard DDR4 platforms. | Select only for non-standard DIMMs where full JEDEC compliance is waived and software stack controls SPD access. |
| M34E04-FMH6TG (STMicroelectronics) | Identical die and functionality; differs only in tape-and-reel packaging (1000 pcs/reel vs. 3000 pcs/reel) and moisture sensitivity level (MSL3 vs. MSL1). | No functional or electrical difference; same pinout, timing, and SPD behavior - direct physical substitute. | Prefer for high-volume automated assembly where MSL1 handling simplifies factory floor logistics and reduces bake requirements. |
Compared with AT24C04C-SSHM-T, M34E04-FMC9TG delivers guaranteed BIOS recognition and hardware-enforced SPD write safety; versus M34E04-FMH6TG, it trades higher MSL handling overhead for tighter reel packaging suited to low-to-mid volume builds.
Availability
M34E04-FMC9TG is available at Aetrix Electronics and suitable for DDR4 memory module design, server OEM production, and DIMM aftermarket repair requiring stable component supply with full JEDEC EE1004 compliance and long-term obsolescence management.
Supply support for M34E04-FMC9TG 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs, with broad analog, MCU, and memory portfolios.
The M34E04 belongs to ST's Serial EEPROM for Memory Interface Solutions product line, engineered specifically to meet JEDEC SPD requirements for DDR3/DDR4/DDR5 DRAM modules - emphasizing reliability, SMBus timing precision, and factory-programmable protection.
FAQ
What is the purpose of the VHV voltage on SA0?
VHV (typically >2.5 V applied to SA0) is required to execute SWPn (set write protection) and CWP (clear all protection) commands. This prevents accidental activation during normal 1.7–3.6 V operation. The device samples SA0 voltage level during command decode - only accepting protection commands when VHV is detected, ensuring robustness against noise or glitch-induced writes.
How does page selection work for reading/writing SPD data?
Page selection is controlled via SPA0/SPA1 commands: SPA0 sets the active page to lower 256 bytes (addresses 0x00–0xFF), SPA1 selects upper 256 bytes (0x100–0x1FF). All subsequent Read/Write EE commands operate on the selected page until changed. This enables full 512-byte access while maintaining backward compatibility with M34E02's single-page protocol.
Can M34E04-FMC9TG be used in DDR5 modules?
Yes - the M34E04 meets JEDEC EE1004, which defines the base SPD format used in DDR4 and DDR5. While DDR5 introduces optional extensions (e.g., SPD5), the core 512-byte layout, SMBus interface, and protection mechanisms remain identical. System BIOS must support DDR5-specific fields separately, but the M34E04 serves as compliant foundation storage.
What happens if WC pin is left floating?
When WC is unconnected (floating), it defaults to high via internal weak pull-up, disabling all write operations regardless of software protection state. This failsafe behavior prevents unintended writes during board bring-up or handling. To enable writes, WC must be actively driven low - a deliberate hardware action reinforcing SPD data integrity.
M34E04-FMC9TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- 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:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 95°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UFDFPN (2x3)
M34E04-FMC9TG FAQ
1.How can I place an order for M34E04-FMC9TG through Aetrix?
Please submit a Request for Quotation (RFQ) for M34E04-FMC9TG 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 M34E04-FMC9TG reliable?
The price and inventory of M34E04-FMC9TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M34E04-FMC9TG is usually 5 days.
3.What payment methods are accepted for M34E04-FMC9TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M34E04-FMC9TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M34E04-FMC9TG?
M34E04-FMC9TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M34E04-FMC9TG 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 M34E04-FMC9TG?
For technical support, including M34E04-FMC9TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M34E04-FMC9TG requirements.
6.How does Aetrix verify that M34E04-FMC9TG is sourced from the original manufacturer or authorized distributors?
All M34E04-FMC9TG 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 M34E04-FMC9TG meets industry standards.
7.What is the process for return or replacement of M34E04-FMC9TG?
All M34E04-FMC9TG units undergo pre-shipment inspection (PSI). If there is an issue with M34E04-FMC9TG, 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 M34E04-FMC9TG part is unused and in its original packaging.
Return procedure for M34E04-FMC9TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M34E04-FMC9TG Tags
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