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Microchip Technology 25CSM04T-I/CS0668
- Part No.:
- 25CSM04T-I/CS0668
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-XFBGA, WLCSP
- Datasheet:
-
25CSM04T-I/CS0668.pdf
- Description:
- IC EEPROM 4MBIT SPI 8MHZ 8WLCSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
25CSM04T-I/CS0668 from Microchip Technology Inc. is a 4-Mbit SPI Serial EEPROM with integrated security and dual-mode write protection. It features 524,288 × 8-bit organization, 256-byte page size, built-in ECC for single-bit error correction, factory-programmed 128-bit serial number, and user-lockable 256-byte ID page. It operates across 2.5V–5.5V and supports industrial temperature range (−40°C to +85°C), targeting firmware storage, calibration data retention, and secure device identification in embedded control systems.
For engineers reviewing the 25CSM04T-I/CS0668 datasheet, 25CSM04T-I/CS0668 pinout, 25CSM04T-I/CS0668 application, or 25CSM04T-I/CS0668 equivalent, key selection considerations include SPI Mode 0/3 compatibility, legacy vs. enhanced write protection configurability, ECC status reporting via STATUS register, and hardware/software partitioned memory protection using MPRs and WP pin behavior.
Technical Context
The 25CSM04T-I/CS0668 implements a dual-register architecture: a 16-bit STATUS register (volatile/nonvolatile mix) controlling WEL, BP bits, WPM, FMPC, and PABP; and eight 8-bit Memory Partition Registers (MPRs) enabling software-defined memory segmentation with four protection levels per partition. Its ECC logic corrects up to one bit error per 4-byte read and reports correction status via the ECS bit.
It supports JEDEC-compliant Manufacturer ID read (9Fh opcode), delivers 8 MHz max clock frequency at VCC ≥3.0V, and includes HOLD functionality that pauses communication without resetting the sequence-while allowing WP pin state changes during hold. The Security register is physically isolated from main array and contains preprogrammed 128-bit serial number (bytes 0–15) followed by 256-byte user-programmable lockable ID page.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8), organized as 2,048 pages of 256 bytes - enables efficient bulk writes and reduces page boundary management overhead. |
| Write Cycle Time | ≤5 ms self-timed internal write - eliminates need for external timing control; busy polling required before next command. |
| ECC Capability | Corrects 1-bit error per 4-byte read; ECS bit in STATUS register flags correction event - improves data integrity in noisy environments without host-side decoding. |
| Operating Voltage | 2.5V to 5.5V - supports direct interface with 3.3V and 5V microcontrollers without level shifting. |
| Max Clock Frequency | 8 MHz at VCC ≥3.0V; 5 MHz at VCC ≥2.5V - defines maximum throughput: ~1 MB/s read, ~512 KB/s write (256-byte page). |
| Data Retention | >100 years at 55°C - ensures long-term reliability for infrequently updated configuration or calibration data. |
| Endurance | 1,000,000 write cycles - validated for 4-byte aligned sequences; critical for logging or counter applications. |
| ESD Protection | >4 kV HBM - meets IEC 61000-4-2 Level 2 requirements for robustness in industrial assembly and field operation. |
Pinout & Package
25CSM04T-I/CS0668 is packaged in 8-Lead SOIC (0.154", 3.90 mm), compatible with standard surface-mount reflow profiles and manual prototyping. Pin functions are electrically identical across SOIC, TDFN, and CSP variants per Microchip DS20005817C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: high-Z SO and ignored SI when deasserted; initiates instruction decode on falling edge. |
| SO | Serial Data Output | CMOS output, MSB-first, clocked on SCK falling edge; enters high-Z when CS high or HOLD active. |
| WP | Write-Protect Control | Hardware-enables STATUS/MPR write lock when WPEN=1; controls partition-level protection in Enhanced mode. |
| VSS | Ground Reference | Primary return path for all I/O and core logic; must be low-impedance connection to avoid noise coupling. |
| SI | Serial Data Input | MSB-first input latched on SCK rising edge; ignored unless CS is asserted and device not in HOLD. |
| SCK | Serial Clock Input | Master-generated clock; defines timing for SI sampling (rising edge) and SO output (falling edge); supports Mode 0/3. |
| HOLD | Communication Pause | Pauses ongoing SPI transfer without resetting state; SO goes high-Z; WP remains functional during hold. |
| VCC | Supply Voltage | 2.5V–5.5V power rail; requires local 0.1 µF ceramic decoupling near pin; POR threshold is 1.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC SPI Manufacturer ID Support | Enables runtime device identification via 9Fh opcode - eliminates hardcoded part assumptions in bootloader or firmware update logic. |
| Configurable Write Protection Modes | Legacy (BP bits) and Enhanced (MPR-based) modes selectable via WPM bit - allows migration from simple block lock to fine-grained partition control. |
| Factory-Programmed 128-Bit Serial Number | Globally unique identifier stored in read-only Security register section - removes manufacturing serialization step and enables secure device binding. |
| User-Programmable Lockable ID Page | 256-byte EEPROM section in Security register, permanently lockable via LOCK instruction - ideal for storing immutable keys or certificates. |
| Enhanced Reliability Architecture | Built-in ECC + >1M endurance + >100-year retention - meets automotive AEC-Q100 Class 2 and industrial long-life requirements. |
| Software Device Reset (SRST) | 7Ch opcode resets STATUS latch and internal state without power cycle - simplifies recovery from bus contention or protocol errors. |
Applications
| Firmware Storage | Calibration Data Management |
|---|---|
|
Use Scenario: Storing boot firmware images and bootloader configuration parameters in resource-constrained microcontroller systems. IC Role / Device Role / Timing Role: Nonvolatile storage peripheral interfaced via SPI; provides byte/page read/write with deterministic ≤5 ms write latency. Use Value: Enables field-upgradable firmware without external programming hardware; ECC ensures integrity of critical startup code. |
Use Scenario: Retaining sensor calibration coefficients, trim values, and operational history across power cycles in industrial sensors. IC Role / Device Role / Timing Role: Secure, long-life data logger with hardware write protection - prevents accidental overwrites during system initialization. Use Value: Factory-programmed serial number links calibration data to specific unit; lockable ID page stores cryptographic keys used in calibration verification. |
| Secure Device Identity | Industrial Control Configuration |
|
Use Scenario: Implementing device authentication in IoT gateways where each node must present a unique, unclonable identity. IC Role / Device Role / Timing Role: Hardware root-of-trust element providing cryptographically verifiable 128-bit serial number and tamper-resistant key storage. Use Value: Eliminates need for external secure elements; preprogrammed serial number is globally unique across Microchip's CS series - prevents cloning attacks. |
Use Scenario: Storing PLC I/O mapping tables, PID tuning parameters, and safety-critical configuration in programmable logic controllers. IC Role / Device Role / Timing Role: Configurable nonvolatile memory with dual protection: hardware (WP pin) for emergency lockdown and software (MPRs) for granular access control. Use Value: Enhanced Write Protection mode allows independent locking of safety-critical registers while permitting updates to non-critical settings - meets IEC 61508 SIL-2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSHN-B | No built-in ECC; no Security register; 4-Mbit, 8 MHz, 2.7–3.6 V only; SOIC-8 package. | Lacks serial number and lockable ID - unsuitable for secure identity or cryptographic key storage. | Select when cost sensitivity outweighs ECC and security needs; verify voltage compatibility with host MCU. |
| M95M04-DRMN6TP/K | 4-Mbit, 5 MHz max, 1.8–5.5 V; includes ECC but no factory serial number or lockable ID page; TSSOP-8. | Provides basic ECC but cannot replace 25CSM04T-I/CS0668 in applications requiring guaranteed unique identifiers or permanent key storage. | Choose for ultra-low-voltage (1.8V) operation where serial number is not required; confirm MPR-equivalent partitioning is unnecessary. |
Compared with AT25DF041A-SSHN-B and M95M04-DRMN6TP/K, the 25CSM04T-I/CS0668 uniquely combines JEDEC ID support, factory-unique 128-bit serial number, lockable 256-byte ID page, and dual-mode write protection - making it the only option among the three for secure device provisioning and certified configuration storage.
Availability
25CSM04T-I/CS0668 is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 25CSM04T-I/CS0668 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 Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25CSM04T-I/CS0668 belongs to Microchip's CS-series Serial EEPROM product line, designed specifically for applications demanding enhanced data integrity, secure identity management, and flexible, field-configurable memory protection in harsh industrial and automotive environments.
FAQ
What is the maximum clock frequency supported by the 25CSM04T-I/CS0668?
The 25CSM04T-I/CS0668 supports up to 8 MHz SPI clock frequency when VCC is ≥3.0V, and 5 MHz when VCC is ≥2.5V. These limits are specified in DS20005817C Table 1-2 and apply across the full industrial temperature range (−40°C to +85°C). Exceeding these frequencies may result in timing violations and data corruption.
Does the 25CSM04T-I/CS0668 include Error Correction Code (ECC) functionality?
Yes, the 25CSM04T-I/CS0668 integrates on-die ECC logic that corrects up to one bit error per 4-byte read. The ECC Status (ECS) bit in the STATUS register (Byte 1, Bit 6) indicates whether correction occurred during the most recent read. This feature is documented in Section 1.0 and Figure 3-1 of DS20005817C.
How is the 128-bit serial number implemented in the 25CSM04T-I/CS0668?
The 25CSM04T-I/CS0668 contains a factory-programmed, globally unique 128-bit serial number stored in the first 16 bytes (0x000000–0x00000F) of its read-only Security register. This value is fixed at manufacture and cannot be altered. It is accessible via the RDEX instruction (83h) and eliminates the need for external serialization in production lines.
Can the 25CSM04T-I/CS0668 be used with SPI Mode 1 or Mode 2?
No, the 25CSM04T-I/CS0668 supports only SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 0), as confirmed in Section 4.1 of DS20005817C. It does not support Mode 1 or Mode 2 due to fixed sampling on SCK rising edge and output on falling edge - incompatible with CPHA = 1 timing.
What happens to the 25CSM04T-I/CS0668 during a power-on reset?
During power-up, the 25CSM04T-I/CS0668 enters Power-on Reset (POR) until VCC exceeds 1.5 V (VPOR). It remains unresponsive until TVCSL (≥100 µs) elapses after VCC stabilization. The device defaults to Standby mode with WEL = 0, RDY/BUSY = 0, and WPM = 0 (Legacy mode), as defined in Sections 1.1.1 and 1.2.1 of DS20005817C.
25CSM04T-I/CS0668 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- 25CS
- Package/Case:
- 8-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 8 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WLCSP
25CSM04T-I/CS0668 FAQ
1.How can I place an order for 25CSM04T-I/CS0668 through Aetrix?
Please submit a Request for Quotation (RFQ) for 25CSM04T-I/CS0668 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 25CSM04T-I/CS0668 reliable?
The price and inventory of 25CSM04T-I/CS0668 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25CSM04T-I/CS0668 is usually 5 days.
3.What payment methods are accepted for 25CSM04T-I/CS0668?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25CSM04T-I/CS0668 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25CSM04T-I/CS0668?
25CSM04T-I/CS0668 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25CSM04T-I/CS0668 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 25CSM04T-I/CS0668?
For technical support, including 25CSM04T-I/CS0668 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25CSM04T-I/CS0668 requirements.
6.How does Aetrix verify that 25CSM04T-I/CS0668 is sourced from the original manufacturer or authorized distributors?
All 25CSM04T-I/CS0668 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 25CSM04T-I/CS0668 meets industry standards.
7.What is the process for return or replacement of 25CSM04T-I/CS0668?
All 25CSM04T-I/CS0668 units undergo pre-shipment inspection (PSI). If there is an issue with 25CSM04T-I/CS0668, 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 25CSM04T-I/CS0668 part is unused and in its original packaging.
Return procedure for 25CSM04T-I/CS0668:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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