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Microchip Technology 25CSM04-I/SN
- Part No.:
- 25CSM04-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25CSM04-I/SN.pdf
- Description:
- IC EEPROM 4MBIT SPI 8MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
25CSM04-I/SN from Microchip Technology Inc. is a 4-Mbit SPI serial EEPROM with integrated security register, ECC error correction, and dual-mode write protection (Legacy/Enhanced). It features 524,288 × 8-bit organization, 256-byte page size, 8 MHz max clock at ≥3.0V, and operates across 2.5V–5.5V. Used in industrial control modules for firmware storage and device authentication.
For engineers reviewing the 25CSM04-I/SN datasheet, 25CSM04-I/SN pinout, 25CSM04-I/SN application, or 25CSM04-I/SN equivalent, key selection criteria include its factory-programmed 128-bit serial number, user-lockable 256-byte ID page, JEDEC-compliant Manufacturer ID read capability, and configurable memory partitioning via eight nonvolatile MPRs.
Technical Context
The 25CSM04-I/SN implements a dedicated SPI slave interface supporting Mode 0 and Mode 3, with data latched on SCK rising edge and output on falling edge. Its internal architecture includes separate 4-Mbit main array and 4-Kbit security register - the latter containing a read-only 128-bit globally unique serial number (bytes 0–15) followed by 256 bytes of user-programmable, software-lockable ID space.
Write protection is managed through two distinct schemes: Legacy mode uses BP[1:0] bits in the STATUS register to block quarter/half/full array writes, while Enhanced mode employs eight 8-bit Memory Partition Registers (MPR0–MPR7), each defining endpoint addresses and independent protection behavior (unprotected, software-locked, hardware-locked via WP, or permanently frozen). ECC logic corrects single-bit errors within any 4-byte read window and reports correction status via the ECS bit.
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 firmware updates with minimal command overhead. |
| Interface | SPI-compatible, Mode 0/3 only - ensures interoperability with standard microcontroller SPI peripherals without custom timing logic. |
| Max Clock Frequency | 8 MHz at VCC ≥ 3.0V; 5 MHz at VCC ≥ 2.5V - supports high-speed configuration loading in power-constrained industrial nodes. |
| Write Cycle Time | ≤5 ms self-timed - eliminates need for external polling delay; RDY/BUSY bit allows precise host synchronization. |
| ECC Capability | Corrects up to one bit error per 4-byte read window; ECS bit in STATUS register flags corrected reads - improves long-term data integrity in temperature-cycled environments. |
| Security Register | 128-bit factory-programmed serial number (read-only) + 256-byte user-programmable lockable ID page - enables secure device binding and irreversible credential storage. |
| Write Endurance | 1,000,000 cycles - validated for applications requiring frequent parameter logging or calibration updates. |
| Data Retention | >100 years at 55°C - meets extended lifecycle requirements for infrastructure monitoring and embedded control systems. |
Pinout & Package
25CSM04-I/SN is supplied in 8-Lead SOIC (SOIC-8) package, pin-compatible with industry-standard SPI EEPROM footprints. All pins are CMOS-level compatible and support mixed-voltage system interfacing (2.5V–5.5V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; must transition high→low to initiate command sequence; deassertion places SO in high-Z and halts all operations. |
| SO | Serial Data Output | CMOS output; data shifted MSB-first on SCK falling edge; high-Z when CS high or HOLD asserted. |
| WP | Write-Protect Control | Hardware-enables STATUS/MPR write inhibition when WPEN=1; active-low; no effect during ongoing write cycle. |
| VSS | Ground Reference | Primary return path for all I/O and core logic; requires low-impedance connection to system ground plane. |
| SI | Serial Data Input | CMOS input; latches instruction/address/data MSB-first on SCK rising edge; ignored when CS high. |
| SCK | Serial Clock Input | Asynchronous master-generated clock; defines timing for SI sampling and SO output; idle state must match SPI mode (low for Mode 0, high for Mode 3). |
| HOLD | Communication Pause | Active-low; suspends ongoing SPI transfer without resetting state machine; SO goes high-Z; WP remains functional during hold. |
| VCC | Supply Voltage | 2.5V–5.5V operation; internal POR circuit requires monotonic ramp <0.1 V/µs; TVCSL ≥100 µs required after VCC stabilization before CS assertion. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC SPI Manufacturer ID Read | Supports 9Fh opcode to retrieve standardized 5-byte ID (Manufacturer ID + Device ID + EDI) - enables runtime device verification and BOM compliance checking in field-upgradable systems. |
| Enhanced Write Protection Mode | Eight independent Memory Partition Registers (MPR0–MPR7) allow granular, software-defined protection boundaries - critical for separating boot code, application data, and calibration tables in safety-critical firmware. |
| Security Register Locking | User-programmable 256-byte ID page can be permanently locked via LOCK instruction - prevents tampering with cryptographic keys or device-specific credentials post-deployment. |
| Software Device Reset (SRST) | 7Ch opcode resets STATUS, WEL, PREL, and RDY/BUSY bits to power-on defaults without power cycling - simplifies recovery from communication errors in headless industrial gateways. |
| Low-Power Standby Current | 1.0 µA at 2.5V (I-temp) - minimizes quiescent draw in battery-backed sensor nodes and energy-harvesting edge devices. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Vault |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during cold start and runtime reconfiguration; SPI interface synchronized to controller's real-time task scheduler. Use Value: Factory-programmed 128-bit serial number enables traceability across production batches; ECC ensures parameter integrity after 10+ years of thermal cycling in uncontrolled environments. |
Use Scenario: Securing patient-specific calibration coefficients and regulatory audit logs in portable diagnostic equipment certified to IEC 62304. IC Role / Device Role / Timing Role: Tamper-resistant credential vault; Security register lock mechanism prevents unauthorized overwrite of FDA-mandated calibration signatures. Use Value: Software-lockable 256-byte ID page stores encrypted keys; FRZR instruction permanently freezes partition configuration - satisfies data immutability requirements for Class II medical devices. |
| Smart Energy Meter Firmware Backup | Automotive Body Control Module Parameter Storage |
Use Scenario: Holding bootloader images and tariff tables in ANSI C12.22-compliant smart meters exposed to wide ambient temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: High-reliability backup memory; 1,000,000 write cycles support daily firmware delta updates over 10-year service life. Use Value: Dual write protection modes allow legacy block locking for bootloader region and enhanced partitioning for tariff tables - simplifies certification testing across utility variants. |
Use Scenario: Storing seat position profiles, mirror presets, and lighting configurations in automotive body control units operating under ISO 16750-2 electrical stress conditions. IC Role / Device Role / Timing Role: SPI-configurable nonvolatile storage interfaced to ASIL-B microcontroller; HOLD pin enables priority interrupt handling without corrupting parameter writes. Use Value: 4 kV ESD rating and 2.5V–5.5V supply range ensure robustness against load dump transients; WP pin provides hardware-fail-safe protection for critical safety-related settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4-Mbit SPI flash (not EEPROM); lacks built-in ECC, security register, and MPR-based partitioning; supports quad I/O but no HOLD pin. | Optimized for code XIP and high-density firmware storage; unsuitable for secure credential storage or ECC-dependent data logging. | Select only if application requires faster sequential reads (>20 MHz) and does not need factory-unique serialization or error-corrected parameter storage. |
| 25AA040AT-I/MS | 4-Kbit SPI EEPROM; same SOIC-8 package and pinout; no security register, ECC, or enhanced write protection; max clock 10 MHz at 5V but only 1 MHz at 2.5V. | Targeted at simple configuration storage in cost-sensitive consumer devices; insufficient capacity and security for industrial firmware or calibration vaults. | Choose only for legacy designs where footprint compatibility is mandatory and memory density/security requirements are minimal. |
Compared with AT25DF041A-SSH-T and 25AA040AT-I/MS, the 25CSM04-I/SN uniquely delivers factory-serialized identity, ECC-protected data retention, and software-definable memory partitions - making it the sole option among these three for applications demanding both high reliability and cryptographic-grade device binding.
Availability
25CSM04-I/SN is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, smart metering infrastructure, and automotive body electronics requiring stable component supply across extended product lifecycles.
Supply support for 25CSM04-I/SN 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 25CSM04-I/SN belongs to Microchip's CS-series of secure serial EEPROMs, engineered specifically for industrial and medical applications requiring guaranteed device identity, long-term data integrity, and flexible, field-upgradeable memory protection schemes.
FAQ
What is the purpose of the 128-bit serial number in the 25CSM04-I/SN security register?
The 128-bit serial number in the 25CSM04-I/SN security register is factory-programmed, globally unique across all CS-series EEPROMs, and stored in read-only bytes 0–15. It eliminates the need for external serialization during manufacturing and enables secure device identification in firmware update protocols, anti-counterfeiting systems, and regulatory audit trails - all without consuming main array memory or requiring host-side key management. The 25CSM04-I/SN guarantees uniqueness at the wafer level.
How does the ECC functionality in the 25CSM04-I/SN improve data reliability?
The 25CSM04-I/SN implements on-die ECC that detects and corrects single-bit errors within any 4-byte read window. When enabled, the ECC Status (ECS) bit in the STATUS register is set to '1' if correction occurred during the most recent read. This ensures bit-level data integrity over >100 years of retention, especially critical in thermally stressed industrial deployments where latent soft errors could otherwise corrupt calibration data or firmware metadata. The 25CSM04-I/SN performs correction transparently without host intervention.
Can the 25CSM04-I/SN be used in systems powered by 2.5V logic rails?
Yes, the 25CSM04-I/SN operates fully across 2.5V–5.5V, with verified 5 MHz SPI clock support and 1.0 µA standby current at 2.5V (I-temp). Its VIH/VIL thresholds scale with VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), ensuring reliable interfacing with 2.5V microcontrollers. DC and AC characteristics - including write endurance and data retention - are specified across this full voltage range, making the 25CSM04-I/SN suitable for battery-powered and energy-harvesting systems where supply voltage may dip near 2.5V.
What happens to an ongoing write cycle when the HOLD pin is asserted on the 25CSM04-I/SN?
Asserting the HOLD pin on the 25CSM04-I/SN has no effect on an active internal write cycle - the 5 ms self-timed operation continues uninterrupted. HOLD only pauses serial communication (SI/SO/SCK interaction) while CS remains low; it cannot suspend or abort writes already committed to the EEPROM array. Once the write completes, the RDY/BUSY bit clears and the device resumes normal SPI responsiveness. This behavior ensures data consistency even during host interrupt servicing, a key requirement in real-time industrial controllers using the 25CSM04-I/SN.
How is memory partitioning configured in Enhanced Write Protection mode on the 25CSM04-I/SN?
In Enhanced Write Protection mode, the 25CSM04-I/SN uses eight 8-bit Memory Partition Registers (MPR0–MPR7) to define up to eight independent address ranges. Each MPR holds an endpoint address (A18–A13) and protection behavior bits. Configuration requires first setting the Partition Register Write Enable Latch (PREL) via PRWE instruction, then writing MPR values with WMPR, and optionally freezing the configuration permanently with FRZR. This allows fine-grained control - for example, locking bootloader sectors while leaving application parameter regions writable - a capability not present in standard SPI EEPROMs like the 25CSM04-I/SN's predecessors.
25CSM04-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- 25CS
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
25CSM04-I/SN FAQ
1.How can I place an order for 25CSM04-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25CSM04-I/SN 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 25CSM04-I/SN reliable?
The price and inventory of 25CSM04-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25CSM04-I/SN is usually 5 days.
3.What payment methods are accepted for 25CSM04-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25CSM04-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25CSM04-I/SN?
25CSM04-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25CSM04-I/SN 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 25CSM04-I/SN?
For technical support, including 25CSM04-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25CSM04-I/SN requirements.
6.How does Aetrix verify that 25CSM04-I/SN is sourced from the original manufacturer or authorized distributors?
All 25CSM04-I/SN 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 25CSM04-I/SN meets industry standards.
7.What is the process for return or replacement of 25CSM04-I/SN?
All 25CSM04-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25CSM04-I/SN, 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 25CSM04-I/SN part is unused and in its original packaging.
Return procedure for 25CSM04-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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