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Microchip Technology AT24C04C-XHM-B
- Part No.:
- AT24C04C-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C04C-XHM-B.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:17,015
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Product details
Overview
AT24C04C-XHM-B from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM organized as 512 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write-protection via dedicated WP pin - used for nonvolatile configuration storage in microcontroller-based embedded systems.
For engineers reviewing the AT24C04C-XHM-B datasheet, AT24C04C-XHM-B pinout, AT24C04C-XHM-B application, or AT24C04C-XHM-B equivalent, key selection criteria include I²C bus voltage compatibility (1.7–5.5V), page-write capability (16-byte pages), ultra-low standby current (≤6 μA), and hardware write protection implementation using the WP pin.
Technical Context
The AT24C04C-XHM-B implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds depending on VCC level. It uses internal address latching and auto-incrementing during sequential reads.
Memory is organized into 32 pages of 16 bytes each, enabling partial-page writes and supporting both random and sequential read modes. Write operations are self-timed with ≤5 ms maximum cycle time and include built-in write-cycle polling via ACK polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,096 bits (512 × 8), sufficient for firmware configuration, calibration data, or device ID storage |
| Supply voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| I²C speed modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz (2.5–5.5V) - selectable based on system timing budget and noise environment |
| Write endurance | 1,000,000 cycles - supports frequent field-updatable parameters in industrial logging or metering applications |
| Data retention | 100 years at 55°C - ensures long-term reliability for unattended equipment and infrastructure deployments |
| Standby current | ≤6 μA at 5.5V - critical for battery-powered IoT nodes and energy-harvesting systems |
| Write-protect function | Dedicated WP pin tied to VCC disables all writes - provides hardware-level security against accidental overwrites |
Pinout & Package
AT24C04C-XHM-B is housed in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flanks, suitable for automated optical inspection (AOI) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Internally unused; must be left floating or grounded per layout guidelines - no functional impact |
| 2 (A1) | Device address input | Hardwired to GND/VCC to set LSB of I²C slave address (1010 A2 A1 0); enables up to four devices on same bus |
| 3 (A2) | Device address input | Hardwired to GND/VCC to set second LSB of I²C slave address; used with A1 for multi-device addressing |
| 4 (GND) | Ground reference | System ground return path; must be low-impedance connection to minimize noise coupling into SDA/SCL |
| 5 (SDA) | Serial data bidirectional I/O | Open-drain line requiring external pull-up (≤10 kΩ); shared across multiple I²C devices; supports wire-OR logic |
| 6 (SCL) | Serial clock input | Host-generated clock signal; rising edge latches input data, falling edge outputs data; filtered for noise immunity |
| 7 (WP) | Write-protect control | Logic-high (VCC) disables all writes to memory array; logic-low (GND) enables normal write operations |
| 8 (VCC) | Power supply input | 1.7–5.5V supply; requires local 100 nF decoupling capacitor placed within 2 mm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte page write mode | Enables efficient partial updates without erasing full pages - reduces write latency and extends EEPROM lifetime |
| Schmitt-triggered, filtered inputs | Rejects fast transients and EMI on SDA/SCL lines - improves robustness in electrically noisy industrial environments |
| Internal power-on reset (POR) | Prevents spurious writes during power ramp-up; requires ≥100 µs delay after VCC stabilization before first command |
| Hardware write protection (WP) | Physically blocks write access when WP = VCC - eliminates risk of firmware corruption due to software bugs or glitches |
| ESD protection >4,000V | Withstands HBM ESD events common during handling and board assembly - reduces field failure rates |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated sensor coefficients and linearization tables in programmable sensors deployed in HVAC or process control systems. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding trim values accessed at power-on by MCU firmware before sensor initialization. Use Value: Eliminates need for external calibration EEPROM or costly laser-trimmed resistors; supports field recalibration via I²C without hardware changes. |
Use Scenario: Retaining tariff schedules, billing counters, and communication module settings in utility-grade electricity meters operating for 15+ years. IC Role / Device Role / Timing Role: Tamper-resistant parameter store updated only during secure firmware upgrades or utility commissioning. Use Value: Hardware WP pin prevents unauthorized modification of billing data; 100-year data retention meets regulatory compliance requirements. |
| IoT Edge Node Identity | Medical Device Settings Backup |
Use Scenario: Holding unique device identifiers (MAC, serial number), cryptographic keys, and network credentials in battery-powered wireless sensor nodes. IC Role / Device Role / Timing Role: Secure boot-time credential loader accessed early in MCU startup sequence before radio initialization. Use Value: Ultra-low 6 μA standby current extends coin-cell life beyond 5 years; I²C interface minimizes GPIO usage on resource-constrained MCUs. |
Use Scenario: Preserving user-adjusted therapy parameters (e.g., infusion rate, alarm thresholds) across power cycles in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe configuration backup written immediately after parameter change and verified before display update. Use Value: 1M write cycles ensure reliable updates over 10,000+ clinical sessions; industrial temp range supports sterilization and cold-chain transport. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C04-RMN6TP | Same 4-Kbit capacity, 1.7–5.5V, but rated only to 400 kHz max (no FM+); WP pin implemented differently (active-high vs. active-high with internal pull-down) | Lacks 1 MHz mode - unsuitable for high-throughput logging where faster writes reduce host CPU wait time | Choose when cost sensitivity outweighs speed requirement and existing design uses identical WP biasing scheme |
| ON Semiconductor CAT24C04HU4IGT3 | Identical pinout and 1.7–5.5V operation; supports 1 MHz FM+ but specifies higher max standby current (10 μA vs. 6 μA) | Higher leakage may impact battery life in ultra-low-power designs with frequent wake/sleep cycles | Acceptable for mains-powered systems; verify WP pin behavior matches schematic - CAT24C04 uses weak internal pull-down, not strong like AT24C04C |
Compared with M24C04-RMN6TP and CAT24C04HU4IGT3, the AT24C04C-XHM-B delivers superior speed flexibility (1 MHz FM+), lowest standby current, and stronger internal WP pin pull-down - making it optimal for next-generation energy-efficient and high-speed embedded systems.
Availability
AT24C04C-XHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and IoT edge node identity management requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24C04C-XHM-B 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 is a global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with emphasis on reliability, longevity, and industrial-grade performance.
The AT24C04C-XHM-B belongs to Microchip's legacy serial EEPROM product line, designed specifically for robust, low-power, and pin-compatible nonvolatile storage in space-constrained embedded systems across industrial, medical, and consumer applications.
FAQ
What is the maximum I²C clock frequency supported by the AT24C04C-XHM-B?
The AT24C04C-XHM-B supports up to 1 MHz in Fast Mode Plus, but only when VCC is ≥2.5V. At 1.7V–2.49V, maximum speed is limited to 400 kHz (Fast mode). This voltage-dependent speed scaling allows designers to optimize between power efficiency and throughput based on system rail constraints.
Does the AT24C04C-XHM-B require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C04C-XHM-B requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input-only pin. Recommended values are ≤10 kΩ for SDA and ≤4.7 kΩ for SCL at 400 kHz, adjusted downward for 1 MHz operation to meet rise-time requirements.
How does the write-protect (WP) pin function on the AT24C04C-XHM-B?
When the WP pin is driven high (VCC), the AT24C04C-XHM-B disables all write operations to its entire memory array. When WP is low (GND), normal writes are enabled. If left floating, the pin is internally pulled down - but Microchip recommends hardwiring WP to avoid noise-induced state transitions.
What is the memory organization of the AT24C04C-XHM-B?
The AT24C04C-XHM-B organizes its 4,096 bits as 512 words × 8 bits, grouped into 32 pages of 16 bytes each. This structure enables efficient 1–16 byte page writes and supports both random and sequential read modes with automatic address incrementing during sequential transfers.
Is the AT24C04C-XHM-B compatible with standard I²C protocol stacks?
Yes, the AT24C04C-XHM-B is fully compliant with standard I²C specifications including Start/Stop conditions, ACK/NACK handshaking, 7-bit addressing (with fixed 1010 prefix and A2/A1 bits), and repeated Start support - ensuring seamless integration with off-the-shelf MCU drivers and RTOS middleware.
AT24C04C-XHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
AT24C04C-XHM-B FAQ
1.How can I place an order for AT24C04C-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C04C-XHM-B 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 AT24C04C-XHM-B reliable?
The price and inventory of AT24C04C-XHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C04C-XHM-B is usually 5 days.
3.What payment methods are accepted for AT24C04C-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C04C-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C04C-XHM-B?
AT24C04C-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C04C-XHM-B 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 AT24C04C-XHM-B?
For technical support, including AT24C04C-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C04C-XHM-B requirements.
6.How does Aetrix verify that AT24C04C-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24C04C-XHM-B 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 AT24C04C-XHM-B meets industry standards.
7.What is the process for return or replacement of AT24C04C-XHM-B?
All AT24C04C-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C04C-XHM-B, 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 AT24C04C-XHM-B part is unused and in its original packaging.
Return procedure for AT24C04C-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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