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STMicroelectronics M34E02-FDW1TP
- Part No.:
- M34E02-FDW1TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M34E02-FDW1TP.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,394
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Product details
Overview
M34E02-FDW1TP from STMicroelectronics is a 2-Kbit (256 × 8) I²C-compatible serial presence detect (SPD) EEPROM designed for DDR1/DDR2/DDR3 DRAM modules. It operates from 1.7 V to 5.5 V, supports 400 kHz I²C bus speed, features permanent/reversible software write protection for the lower 128 bytes, and delivers >1 million erase/write cycles with >40 years data retention in TSSOP8 and UFDFPN8 packages.
For engineers reviewing the M34E02-FDW1TP datasheet, M34E02-FDW1TP pinout, M34E02-FDW1TP application in DDR DIMM SPD, or M34E02-FDW1TP equivalent for memory configuration storage, this page provides verified technical context, validated pin functions, real-world use cases in DRAM module initialization, and confirmed alternatives with documented functional differences.
Technical Context
The M34E02-FDW1TP implements an I²C slave interface with dual device type identifiers (1010b for memory access, 0110b for protection register control), enabling concurrent SPD data storage and write-protection management on shared buses. Its chip enable inputs (E0–E2) allow up to eight devices per bus via hardware address selection.
It integrates two independent write-protection mechanisms: software-controlled (SWP/CWP/PSWP commands via I²C) for the first 128 bytes (00h–7Fh), and hardware-based global lock via the WC pin tied high. The internal power-on reset (POR) circuit prevents spurious writes during voltage ramp-up, and Schmitt-triggered SCL/SDA inputs ensure noise immunity on noisy motherboard traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 bits), sufficient to store full DDR1/DDR2/DDR3 SPD data tables including timing parameters, module geometry, and manufacturer info. |
| I²C interface speed | Up to 400 kHz - compatible with standard SMBus timing and DDR module initialization sequences without requiring clock stretching. |
| Supply voltage range | 1.7 V to 5.5 V - supports operation across DDR1 (3.3 V), DDR2 (2.5 V), and DDR3 (1.5 V) system rails via level-shifting or direct connection. |
| Write endurance | >1,000,000 cycles - ensures reliable reprogramming during module manufacturing, testing, and field firmware updates. |
| Data retention | >40 years at +85 °C - guarantees SPD data integrity over full product lifecycle of servers, workstations, and industrial memory modules. |
| Operating temperature | −40 °C to +85 °C - qualified for commercial and extended-temperature DIMM applications including telecom and embedded systems. |
| Protection granularity | Lower 128 bytes (00h–7Fh) software-lockable - preserves critical SPD fields (e.g., JEDEC timings, module type, density) while allowing upper bytes to be updated for revision tracking. |
Pinout & Package
Package: TSSOP8 (4.4 × 3 mm) and UFDFPN8 (2 × 3 mm), both ECOPACK2® compliant (RoHS + halogen-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E0, E1, E2 | Chip Enable address inputs | Set 3-bit hardware address (b2–b0) for I²C device select code; must be hard-wired to VCC or VSS - no pull resistors allowed to ensure deterministic addressing on multi-device SPD buses. |
| SDA | Serial Data bidirectional line | Open-drain I²C data line requiring external pull-up; interfaces directly with SMBus controller on motherboard for read/write of SPD data and protection registers. |
| SCL | Serial Clock input | Master-generated clock synchronizing all SPD transactions; includes Schmitt trigger for noise rejection on electrically noisy DIMM slots. |
| WC | Hardware write control | Global write-enable/disable: driven low to permit writes, high (or open) to block all memory writes - used for factory lockdown or field-safe update modes. |
| VCC | Power supply | Single supply input supporting 1.7–5.5 V; decoupling capacitor (10–100 nF) required near pins to suppress transient noise during write cycles. |
| VSS | Ground reference | Return path for all internal logic and I/O; must be low-impedance connection to motherboard ground plane to maintain signal integrity on SDA/SCL. |
Key Features
| Feature | Design Value |
|---|---|
| Dual I²C device identifiers | 1010b for memory array access and 0110b for protection register control - enables atomic SPD data reads and write-protection state changes without bus contention or address collision. |
| Reversible & permanent SWP | Software commands (SWP/CWP) allow field-upgradable protection of SPD critical region; PSWP locks protection permanently after final programming - essential for JEDEC-compliant module certification. |
| Noise-immune I/O | Schmitt-trigger inputs on SCL/SDA and internal noise filtering - eliminates false start/stop detection in high-noise server environments where DIMMs share routing with switching regulators and PCIe lanes. |
| Self-timed write cycle | Internal timing eliminates need for host polling delay; ACK polling supported for precise synchronization - reduces DIMM initialization latency during BIOS POST. |
| ECOPACK2® packaging | TSSOP8 and UFDFPN8 variants meet RoHS and halogen-free requirements - satisfies environmental compliance mandates for enterprise and industrial memory modules shipped globally. |
Applications
| DDR3 Server DIMM SPD | DDR2 Industrial Memory Module |
|---|---|
Use Scenario: Storing JEDEC-defined SPD data (timings, voltage, density, thermal specs) on registered DDR3 RDIMMs used in dual-socket Xeon servers. IC Role / Device Role / Timing Role: Serial presence detect EEPROM providing mandatory configuration data to memory controller during power-on initialization sequence. Use Value: Enables automatic, error-free memory training and frequency negotiation without manual BIOS configuration - critical for high-reliability data center deployments. |
Use Scenario: Configuring unbuffered DDR2 UDIMMs deployed in programmable logic controllers (PLCs) operating in −25 °C to +70 °C industrial enclosures. IC Role / Device Role / Timing Role: Nonvolatile SPD storage element interfacing with microcontroller-based SMBus master to validate module compatibility before runtime execution. Use Value: Prevents boot failure due to mismatched memory by enforcing JEDEC SPD compliance at cold start - improves system robustness in harsh environments. |
| DDR1 Legacy Workstation Memory | Multi-DIMM Motherboard SPD Hub |
Use Scenario: Supporting legacy DDR1 SODIMMs in medical imaging workstations requiring long-term component availability and stable firmware behavior. IC Role / Device Role / Timing Role: SPD EEPROM storing module-specific CAS latency, tRCD, and burst length parameters readable by chipset during early POST. Use Value: Ensures consistent memory timing across production batches despite DRAM die revisions - simplifies regulatory re-certification for Class II medical devices. |
Use Scenario: Managing SPD data across four DDR3 DIMM slots on a high-end workstation motherboard using shared I²C bus with E0–E2 address differentiation. IC Role / Device Role / Timing Role: One of up to eight uniquely addressed SPD slaves on single SMBus segment, each storing distinct module configuration. Use Value: Eliminates need for discrete I²C multiplexers - reduces BOM cost and PCB area while maintaining deterministic readout order during multi-module enumeration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPD EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02C-SSHM-T | 2-Kbit I²C EEPROM with 1 MHz max clock, no dedicated WC pin or PSWP command; write protection limited to WP pin + page-level lock. | Lacks SPD-specific features: no SWP/CWP/PSWP instruction set, no guaranteed DDR timing compliance, no JEDEC SPD register map validation. | Select only for non-SPD generic storage where DDR module certification is not required. |
| M34E02-FDW6TP | Same die and functionality; differs only in package (UFDFPN8 vs TSSOP8) and temperature grade (−40 °C to +105 °C vs −40 °C to +85 °C). | Identical SPD use cases; higher temp grade supports extended-range industrial motherboards or compact thermal envelopes. | Choose when board layout requires 2×3 mm footprint or ambient operating temperature exceeds +85 °C. |
Compared with AT24C02C-SSHM-T, M34E02-FDW1TP provides JEDEC-validated SPD functionality, irreversible protection for critical timing fields, and hardware WC lock - making it suitable for certified DDR modules. Versus M34E02-FDW6TP, it trades extended temperature support for standard commercial-grade qualification and TSSOP8 mechanical compatibility with legacy DIMM layouts.
Availability
M34E02-FDW1TP is available at Aetrix Electronics and suitable for DDR1/DDR2/DDR3 memory module manufacturing, server motherboard design, and industrial embedded memory subsystems requiring stable component supply, JEDEC SPD compliance, and long-term obsolescence management.
Supply support for M34E02-FDW1TP 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 M34E02-FDW1TP belongs to ST's serial EEPROM product line engineered specifically for JEDEC-compliant SPD applications in DRAM modules - emphasizing reliability, write-protection integrity, and seamless integration into memory initialization firmware stacks.
FAQ
What is the purpose of the WC pin on the M34E02-FDW1TP?
The WC (Write Control) pin is a hardware-level enable/disable for all write operations to the EEPROM array. When pulled high (or left floating), it blocks all writes - including byte/page writes and protection register updates - ensuring SPD data remains immutable during system operation. This complements software-based protection for defense-in-depth security in certified memory modules.
Can the M34E02-FDW1TP be used in DDR4 or LPDDR modules?
No. The M34E02-FDW1TP is explicitly designed and qualified for DDR1, DDR2, and DDR3 SPD applications per JEDEC standards JESD21-C and JESD37-A. DDR4 uses different SPD layout (256-byte minimum, new register definitions), and LPDDR employs alternate interfaces (e.g., sideband); ST does not specify or guarantee compatibility with those protocols.
How does the PSWP command differ from SWP/CWP?
PSWP (Permanently Set Write Protection) irreversibly locks the lower 128 bytes after execution - no subsequent CWP or power cycle can restore write access. In contrast, SWP enables reversible protection that CWP can clear. PSWP is used during final module programming to meet JEDEC SPD write-protection requirements for production-certified DIMMs.
Is the M34E02-FDW1TP pin-compatible with the older M34C02?
Yes - the M34E02-FDW1TP is backward compatible with the M34C02 in pinout, package, and basic I²C protocol. It retains identical E0–E2, SDA, SCL, WC, VCC, and VSS connections and supports the same device select codes. However, it adds enhanced noise filtering, wider voltage range (1.7–5.5 V vs 2.5–5.5 V), and PSWP functionality not present in the M34C02.
M34E02-FDW1TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
M34E02-FDW1TP FAQ
1.How can I place an order for M34E02-FDW1TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M34E02-FDW1TP 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 M34E02-FDW1TP reliable?
The price and inventory of M34E02-FDW1TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M34E02-FDW1TP is usually 5 days.
3.What payment methods are accepted for M34E02-FDW1TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M34E02-FDW1TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M34E02-FDW1TP?
M34E02-FDW1TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M34E02-FDW1TP 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 M34E02-FDW1TP?
For technical support, including M34E02-FDW1TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M34E02-FDW1TP requirements.
6.How does Aetrix verify that M34E02-FDW1TP is sourced from the original manufacturer or authorized distributors?
All M34E02-FDW1TP 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 M34E02-FDW1TP meets industry standards.
7.What is the process for return or replacement of M34E02-FDW1TP?
All M34E02-FDW1TP units undergo pre-shipment inspection (PSI). If there is an issue with M34E02-FDW1TP, 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 M34E02-FDW1TP part is unused and in its original packaging.
Return procedure for M34E02-FDW1TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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