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Microchip Technology AT24CS04-MAHM-T
- Part No.:
- AT24CS04-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS04-MAHM-T.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
AT24CS04-MAHM-T from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, operating from 1.7V to 5.5V, supporting 100/400 kHz and 1 MHz Fast Mode Plus, and featuring hardware write protection via WP pin. It is used for secure device identification and nonvolatile configuration storage in industrial control modules.
For engineers reviewing the AT24CS04-MAHM-T datasheet, AT24CS04-MAHM-T pinout, AT24CS04-MAHM-T application, or AT24CS04-MAHM-T equivalent, key selection criteria include its guaranteed-unique serial number, industrial temperature range (–40°C to +85°C), ultra-low standby current (≤6 μA), page-write capability (16-byte pages), and compatibility with I²C bus systems requiring robust noise immunity and hardware data protection.
Technical Context
The AT24CS04-MAHM-T implements a two-wire I²C slave interface with Schmitt-trigger inputs and integrated spike suppression filters, enabling reliable operation in electrically noisy environments. Its memory array is organized as 512 × 8 bits across 32 pages of 16 bytes each, with full support for random, sequential, and current-address read modes.
It features an internal power-on reset (POR) circuit with VPOR ≤ 1.5 V and tPUP ≥ 100 µs, ensuring deterministic initialization. The device uses hard-wired A1/A2 address pins (A1 active on AT24CS04) to enable up to four devices on a single I²C bus, and includes a dedicated WP pin that-when tied to VCC-locks the entire memory array against writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8), nonvolatile EEPROM with 100-year data retention |
| Supply voltage | 1.7 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers |
| I²C speed modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus) - enables high-throughput configuration updates |
| Write endurance | 1,000,000 cycles - suitable for frequent calibration or logging applications |
| Standby current | ≤6 μA at 5.5 V - minimizes system-level quiescent power in battery-backed designs |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded systems |
| Serial number | 128-bit factory-programmed, read-only, globally unique across CS Series - enables secure device binding without host-side serialization logic |
Pinout & Package
AT24CS04-MAHM-T is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), with pins arranged per JEDEC MS-012. All pins are electrically validated per Microchip DS20006350A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Device address input | Hard-wired to GND or VCC to configure one of four possible I²C addresses; required for multi-device bus topology |
| A2 | Device address input | Second address bit enabling up to four AT24CS04 devices on same bus; internally pulled down if floating |
| GND | Ground reference | System ground connection; must be low-impedance to ensure stable I²C signaling and POR behavior |
| VCC | Power supply | 1.7–5.5 V supply; slew rate ≤0.1 V/µs required for reliable power-up sequencing |
| WP | Hardware write-protect | Logic-high (VCC) disables all writes to memory; eliminates need for software lockout in safety-critical firmware |
| SCL | Serial clock input | Open-drain compatible; requires external pull-up; controls timing of all data transfers on rising/falling edges |
| SDA | Bidirectional serial data | Open-drain I/O; shared across multiple slaves; requires external pull-up ≤10 kΩ for proper ACK/NACK timing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique identifier stored outside user memory space - removes production-line serialization overhead |
| Hardware write protection (WP pin) | Physically blocks all write operations when asserted - prevents accidental or malicious firmware corruption |
| 16-byte page write mode | Enables partial-page writes without erasing adjacent bytes - improves write efficiency in parameter-tuning applications |
| Schmitt-trigger inputs with noise filtering | Rejects transients <100 ns (Fast Mode) or <50 ns (FM+) - ensures robust communication in motor-drive or power-conversion environments |
| Ultra-low standby current (≤6 μA) | Reduces annual battery drain to <53 mAh/year at 5.5 V - extends shelf life of sealed IoT edge nodes |
Applications
| Industrial Sensor Calibration | Secure Firmware Authentication |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and temperature compensation tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed uniqueness for traceability and anti-counterfeiting. Use Value: Eliminates post-manufacturing calibration steps by embedding calibrated values during wafer test; 128-bit serial number binds calibration data to physical unit. | Use Scenario: Holding cryptographic keys and boot-time integrity hashes in medical diagnostic equipment with regulatory audit requirements. IC Role / Device Role / Timing Role: Tamper-resistant identity anchor; WP pin ensures keys remain unmodified during field updates. Use Value: Enables hardware-rooted device identity without MCU-side key management complexity; 1,000,000 write cycles support lifetime key rotation. |
| Smart Energy Metering | Automated Test Equipment (ATE) |
Use Scenario: Recording meter firmware version, tariff tables, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Low-power, high-reliability data logger with deterministic write timing (≤5 ms). Use Value: 6 μA standby current extends battery backup to >10 years; industrial temp range ensures operation inside outdoor meter enclosures. | Use Scenario: Storing fixture-specific calibration constants and test sequence parameters in modular ATE handler interfaces. IC Role / Device Role / Timing Role: Plug-and-play configuration storage; serial number identifies fixture revision and calibration history. Use Value: Enables automatic fixture recognition and zero-touch setup; 400 kHz I²C interface allows fast parameter loading between test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CS04-SSHM-T | Same die, 8-lead TSSOP package (3 × 3 mm); 0.65 mm pitch; lower profile than SOIC | Better suited for space-constrained PCBs where height or footprint is critical | Select when board area or Z-height is constrained; identical electrical behavior and pinout mapping |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM; no factory serial number; 5 V only; 20 MHz SPI interface | Requires SPI-capable MCU; lacks hardware-based device identity; higher density but no built-in uniqueness | Choose only if SPI interface is already used and serial number is generated externally; not drop-in compatible |
Compared with AT24CS04-MAHM-T, the AT24CS04-SSHM-T offers identical functionality in a smaller package, while the M95M04-DRMN6TP/K provides higher density via SPI but sacrifices the critical 128-bit factory serial number and I²C compatibility - making AT24CS04-MAHM-T the sole choice when guaranteed hardware identity and two-wire simplicity are required.
Availability
AT24CS04-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, secure firmware authentication, and smart energy metering requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT24CS04-MAHM-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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, serving industrial, automotive, and communications markets with vertically integrated silicon and development tools.
The AT24CS04-MAHM-T belongs to Microchip's CS Series Serial EEPROM product line, designed specifically to deliver factory-assured device identity alongside standard nonvolatile storage - eliminating post-production serialization and enabling secure, scalable manufacturing of connected endpoints.
FAQ
What is the function of the A1 pin on the AT24CS04-MAHM-T?
The A1 pin on the AT24CS04-MAHM-T is a device address input used to configure one of four possible I²C slave addresses (0x50–0x53) when hard-wired to GND or VCC. It is not present on the AT24CS08 variant. In the AT24CS04-MAHM-T, A1 is functional and required for multi-device bus addressing. If left floating, it is internally pulled down to GND, but Microchip recommends tying it to a known state to prevent noise-induced misaddressing. This pin directly affects how the AT24CS04-MAHM-T responds to I²C commands on a shared bus.
Does the AT24CS04-MAHM-T support 1 MHz I²C communication?
Yes, the AT24CS04-MAHM-T supports 1 MHz Fast Mode Plus (FM+) I²C communication, but only when VCC is between 2.5 V and 5.5 V. At lower supply voltages (1.7 V to 2.5 V), it operates up to 400 kHz Fast Mode. The FM+ capability enables faster configuration writes and serial number reads in time-sensitive applications, and is fully compliant with I²C-bus specification Rev. 6. The AT24CS04-MAHM-T maintains AC timing compliance-including tLOW ≤ 500 ns and tHIGH ≤ 400 ns-at 1 MHz under valid voltage conditions.
How is the 128-bit serial number accessed on the AT24CS04-MAHM-T?
The 128-bit serial number on the AT24CS04-MAHM-T is stored in a dedicated, read-only memory region outside the main 4-Kbit user array. It is accessed via a separate I²C subaddress (0xFA) using standard random-read protocol: after sending the device address (e.g., 0x50), the master transmits 0xFA, then issues a repeated Start and reads 16 bytes. The value is factory-programmed and permanently locked-no write command can modify it. This ensures the AT24CS04-MAHM-T delivers a cryptographically verifiable, globally unique identifier without consuming user memory space.
What is the maximum write cycle time for the AT24CS04-MAHM-T?
The maximum write cycle time for the AT24CS04-MAHM-T is 5 ms, applicable to both byte and page write operations. This self-timed internal erase/write completes autonomously after the master releases the bus, and the device signals readiness via acknowledge polling (repeatedly attempting to address the device until ACK is received). The 5 ms specification is guaranteed across the full industrial temperature range (–40°C to +85°C) and supply voltage range (1.7 V to 5.5 V), ensuring predictable firmware update latency in real-time systems using the AT24CS04-MAHM-T.
Is the AT24CS04-MAHM-T RoHS compliant and lead-free?
Yes, the AT24CS04-MAHM-T is RoHS compliant and lead-free, and also halide-free per Microchip's green packaging standards. The "MAHM-T" suffix denotes an 8-lead SOIC package with matte tin (Sn) lead finish, meeting JEDEC J-STD-609 Class 2a requirements. This ensures compatibility with lead-free reflow profiles (peak temperature ≤ 260°C) and eliminates hazardous substances per EU Directive 2011/65/EU. All AT24CS04-MAHM-T units shipped by Aetrix Electronics carry full material declarations and certificate of compliance traceable to Microchip's manufacturing lot data.
AT24CS04-MAHM-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:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- 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)
AT24CS04-MAHM-T FAQ
1.How can I place an order for AT24CS04-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS04-MAHM-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 AT24CS04-MAHM-T reliable?
The price and inventory of AT24CS04-MAHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS04-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS04-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS04-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS04-MAHM-T?
AT24CS04-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS04-MAHM-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 AT24CS04-MAHM-T?
For technical support, including AT24CS04-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS04-MAHM-T requirements.
6.How does Aetrix verify that AT24CS04-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS04-MAHM-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 AT24CS04-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS04-MAHM-T?
All AT24CS04-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS04-MAHM-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 AT24CS04-MAHM-T part is unused and in its original packaging.
Return procedure for AT24CS04-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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