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Microchip Technology AT24CS04-MAHM-E
- Part No.:
- AT24CS04-MAHM-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS04-MAHM-E.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,858
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Product details
Overview
AT24CS04-MAHM-E from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 512 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It features hardware write protection (WP), 16-byte page write mode, and supports I²C Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) protocols - used in secure device identification and configuration storage in embedded controllers.
For engineers reviewing the AT24CS04-MAHM-E datasheet, AT24CS04-MAHM-E pinout, AT24CS04-MAHM-E application, or AT24CS04-MAHM-E equivalent, key selection considerations include its factory-locked 128-bit serial number, WP pin-based full-array hardware protection, ultra-low standby current (≤6 μA), 1,000,000 write endurance, and compatibility with space-constrained 8-pad UDFN packaging.
Technical Context
The AT24CS04-MAHM-E implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A1, A2, and WP pins. Its memory array is partitioned into 32 pages of 16 bytes each, supporting byte and page write operations with self-timed write cycles ≤5 ms.
It integrates a dedicated 128-bit read-only serial number block physically isolated from user memory, permanently programmed during wafer test and guaranteed unique across all CS Series EEPROMs. Power-on reset (POR) ensures command rejection until VCC ≥1.5 V and tPUP ≥100 µs elapses post-stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8), nonvolatile EEPROM with 100-year data retention |
| Interface | I²C-compatible two-wire bus: supports 100/400 kHz and 1 MHz FM+ modes |
| Supply Voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded systems |
| Write Endurance | 1,000,000 cycles - supports frequent firmware parameter updates in field-deployed devices |
| Standby Current | ≤6 μA at 5.5V - minimizes battery drain in always-on IoT edge nodes |
| Serial Number | 128-bit factory-programmed, read-only, globally unique identifier - eliminates need for external serialization in manufacturing |
Pinout & Package
AT24CS04-MAHM-E is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads and RoHS-compliant green finish. The exposed pad is optional and may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Not bonded; must be left unconnected on PCB |
| 2 (A1) | Device Address Input | Hard-wired to GND or VCC to set I²C slave address; internally pulled down if floating |
| 3 (A2) | Device Address Input | Second address bit enabling up to four AT24CS04 devices on one I²C bus |
| 4 (GND) | Ground Reference | System ground connection; required for stable logic thresholds and ESD path |
| 5 (SDA) | Serial Data I/O | Open-drain bidirectional line; requires external pull-up resistor ≤10 kΩ |
| 6 (SCL) | Serial Clock Input | Master-generated clock; latches input on rising edge, outputs data on falling edge |
| 7 (WP) | Write-Protect Control | Hardware lock: tied to VCC disables all writes; tied to GND enables normal operation |
| 8 (VCC) | Power Supply | 1.7–5.5V supply; must ramp monotonically at ≤0.1 V/µs during power-up |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit immutable ID, guaranteed unique across entire Microchip CS Series - removes production-line serialization overhead |
| Hardware Write Protection | WP pin disables all memory writes when driven high - prevents accidental or malicious firmware corruption |
| Low-Voltage Operation | Functional down to 1.7V - supports direct integration with 1.8V logic without level shifters |
| Noise-Resilient Interface | Schmitt-triggered inputs with spike suppression filters - maintains reliable I²C communication in electrically noisy industrial environments |
| Page Write Efficiency | 16-byte page write with partial-page capability - reduces write time vs. byte-by-byte and avoids unnecessary erase cycles |
Applications
| Secure Device Authentication | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Embedded system verifies authenticity of peripheral modules (e.g., camera, actuator) before initialization using cryptographic challenge-response. IC Role / Device Role / Timing Role: AT24CS04-MAHM-E provides tamper-resistant, factory-assigned identity credential via its permanent 128-bit serial number. Use Value: Eliminates need for software-based key provisioning; prevents cloning by ensuring each unit presents a globally unique, unalterable ID. | Use Scenario: Factory calibration coefficients for pressure, temperature, or humidity sensors are stored during final test and retained over product lifetime. IC Role / Device Role / Timing Role: AT24CS04-MAHM-E serves as nonvolatile configuration memory, accessed at boot to load sensor linearization parameters. Use Value: Enables high-accuracy analog measurements without recalibration; WP pin ensures coefficients remain unchanged during field operation. |
| IoT Edge Node Configuration | Medical Device Unique Identification |
Use Scenario: Battery-powered wireless sensor node stores network credentials, firmware version, and operational settings across sleep/wake cycles. IC Role / Device Role / Timing Role: AT24CS04-MAHM-E acts as low-power configuration store, accessed via I²C during startup and after OTA updates. Use Value: Ultra-low 6 μA standby current extends battery life; 1M-cycle endurance supports years of field firmware tuning. | Use Scenario: Medical diagnostic equipment complies with UDI (Unique Device Identification) requirements by embedding a permanent, traceable serial number in each unit. IC Role / Device Role / Timing Role: AT24CS04-MAHM-E delivers regulatory-compliant, factory-programmed 128-bit UDI payload readable over I²C without consuming user memory space. Use Value: Meets FDA 21 CFR Part 820 and ISO 13485 traceability mandates; serial number is locked and cannot be overwritten or duplicated. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C04D-MAHM-T | Same 4-Kbit capacity and SOIC/TSSOP/UDFN packaging, but lacks factory-programmed serial number and uses standard I²C addressing only. | No built-in device identity; requires external serialization or software-managed UID generation. | Select when serial number functionality is unnecessary and cost sensitivity outweighs traceability benefits. |
| M95040-DFMN6TP | 4-Kbit SPI EEPROM (not I²C); same voltage range and industrial temp grade; no factory serial number. | Requires SPI host interface instead of I²C; incompatible bus protocol necessitates PCB and firmware changes. | Choose only if system already uses SPI peripherals and I²C bus is saturated or unavailable. |
Compared with AT24C04D-MAHM-T, the AT24CS04-MAHM-E adds irreplaceable secure identity via its permanent serial number; versus M95040-DFMN6TP, it preserves I²C compatibility and eliminates interface redesign, though both lack factory serialization.
Availability
AT24CS04-MAHM-E is available at Aetrix Electronics and suitable for secure device authentication, industrial sensor calibration storage, and IoT edge node configuration requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AT24CS04-MAHM-E 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 AT24CS04-MAHM-E belongs to Microchip's CS Series Serial EEPROM family, engineered specifically to embed secure, factory-assigned identity into resource-constrained embedded systems while maintaining full backward compatibility with legacy I²C EEPROM interfaces.
FAQ
What is the function of the NC pin on the AT24CS04-MAHM-E?
The NC (No Connect) pin on the AT24CS04-MAHM-E is pin 1 in the 8-pad UDFN package and is not electrically bonded. It must remain unconnected on the PCB layout. This pin has no internal circuitry or signal function and serves only as a mechanical placeholder per package design - consistent across all AT24CS04 variants in UDFN format. Leaving it floating or routing traces to it will not affect AT24CS04-MAHM-E operation but violates Microchip's recommended layout practice.
Does the AT24CS04-MAHM-E support I²C Fast Mode Plus (1 MHz)?
Yes, the AT24CS04-MAHM-E supports I²C Fast Mode Plus at up to 1 MHz, but only when VCC is between 2.5V and 5.5V. At lower supply voltages (1.7V–2.5V), it operates in Fast Mode (400 kHz max) or Standard Mode (100 kHz). This voltage-dependent speed scaling is explicitly defined in the AC Characteristics table of the DS20006350A datasheet. System designers must ensure proper pull-up resistor sizing (≤1.3 kΩ) and signal integrity to sustain 1 MHz operation with the AT24CS04-MAHM-E.
How is the 128-bit serial number accessed on the AT24CS04-MAHM-E?
The 128-bit serial number on the AT24CS04-MAHM-E is accessed via a dedicated I²C read sequence starting at memory address 0x0000, using the same slave address as the main array. It resides in a separate, read-only memory block outside the 512-byte user EEPROM space and cannot be written, erased, or altered. The AT24CS04-MAHM-E datasheet specifies that this value is factory-programmed and globally unique across all CS Series devices - making it directly readable without special commands or unlock sequences.
Can the WP pin of the AT24CS04-MAHM-E be left unconnected?
The WP pin of the AT24CS04-MAHM-E is internally pulled down to GND when left floating, enabling write operations by default. However, Microchip explicitly recommends connecting WP to a known logic state (GND for write-enable or VCC for full-array protection) due to potential capacitive coupling in noisy environments that could cause unintended write-enable glitches. Leaving WP unconnected risks intermittent write access and violates robust design practice - especially in industrial or medical applications where data integrity is critical for the AT24CS04-MAHM-E.
What is the maximum write cycle time for the AT24CS04-MAHM-E?
The maximum write cycle time for the AT24CS04-MAHM-E is 5 ms, as specified in the Electrical Characteristics section (tWR parameter) of the DS20006350A datasheet. This applies to both byte and page write operations and represents the worst-case duration the device requires to complete internal programming and verify the data. During this time, the AT24CS04-MAHM-E does not respond to new I²C commands and holds SDA low to signal busy status - requiring the host controller to implement acknowledge polling or fixed-delay waits before issuing subsequent operations.
AT24CS04-MAHM-E 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-E FAQ
1.How can I place an order for AT24CS04-MAHM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS04-MAHM-E 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-E reliable?
The price and inventory of AT24CS04-MAHM-E 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-E is usually 5 days.
3.What payment methods are accepted for AT24CS04-MAHM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS04-MAHM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS04-MAHM-E?
AT24CS04-MAHM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS04-MAHM-E 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-E?
For technical support, including AT24CS04-MAHM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS04-MAHM-E requirements.
6.How does Aetrix verify that AT24CS04-MAHM-E is sourced from the original manufacturer or authorized distributors?
All AT24CS04-MAHM-E 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-E meets industry standards.
7.What is the process for return or replacement of AT24CS04-MAHM-E?
All AT24CS04-MAHM-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS04-MAHM-E, 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-E part is unused and in its original packaging.
Return procedure for AT24CS04-MAHM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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