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Microchip Technology AT24C08D-XHM-T
- Part No.:
- AT24C08D-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C08D-XHM-T.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,876
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Product details
Overview
AT24C08D-XHM-T from Microchip Technology is an I²C-compatible 8-Kbit serial EEPROM organized as 1,024 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C speeds, and featuring hardware write protection via WP pin - used for configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT24C08D-XHM-T datasheet, AT24C08D-XHM-T pinout, AT24C08D-XHM-T application, or AT24C08D-XHM-T equivalent, key selection considerations include its 8-pad UDFN package, 16-byte page write capability, 5 ms max self-timed write cycle, 1 µA max active current, and full-array hardware write protection - critical for secure, low-power, space-constrained designs.
Technical Context
The AT24C08D-XHM-T implements a true I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs, bidirectional data transfer protocol, and internal address decoding for 1,024-word memory space. It uses a dedicated A2 pin for hardware device addressing and WP pin for full-array write inhibition when pulled high.
Its memory architecture comprises 64 pages of 16 bytes each, enabling partial page writes and supporting random/sequential read modes. Internal high-voltage generation enables byte/page writes without external VPP, and Power-on Reset (POR) ensures reliable initialization with tPUP ≥ 100 µs after stable VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1,024 × 8 bits) - sufficient for firmware boot parameters, calibration coefficients, or device ID storage in compact systems. |
| Supply Voltage | 1.7V to 3.6V - compatible with single-cell Li-ion, coin-cell, and 3.3V logic rails without level shifting. |
| I²C Speed Modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (FM+) - supports high-throughput configuration updates in real-time systems. |
| Write Cycle Time | ≤5 ms - enables rapid nonvolatile parameter updates without blocking host MCU execution for extended periods. |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - meets long-life requirements for industrial field devices. |
| Active/Standby Current | 1 mA max ICC2 (write), 0.8 µA max ISB - minimizes battery drain in always-on or energy-harvesting applications. |
| Operating Temperature | −40°C to +85°C - qualified for automotive cabin, industrial PLC, and outdoor IoT node environments. |
Pinout & Package
AT24C08D-XHM-T is supplied in an 8-pad UDFN (Ultra Thin DFN) package, 2.0 mm × 1.6 mm × 0.55 mm, with exposed pad (optional GND connection). Pin numbering follows top-view orientation per Microchip DS20006022A-page 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad - must be left floating or grounded per layout guidelines; no electrical function. |
| 2 (NC) | No Connect | Unbonded die pad - no routing or termination required; avoids unintended coupling. |
| 3 (A2) | Device Address Input | Hardware-selectable LSB of I²C slave address (1010xxxR/W); pulled down internally if floating - enables up to two devices on same bus. |
| 4 (GND) | Ground Reference | Primary return path for VCC and I/O; must connect to system ground plane with low-impedance trace. |
| 5 (SDA) | Serial Data I/O | Open-drain bidirectional line - requires external 1.3–10 kΩ pull-up to VCC; shared across I²C bus slaves. |
| 6 (SCL) | Serial Clock Input | Input-only clock line - must be pulled high externally; timing-critical for all read/write operations. |
| 7 (WP) | Write-Protect Control | Active-high hardware lock - ties to VCC to disable all writes; tied to GND for normal operation. |
| 8 (VCC) | Power Supply | 1.7–3.6V core supply - requires local 100 nF ceramic decoupling capacitor placed ≤2 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-triggered, filtered I/O | Rejects >100 ns noise spikes on SDA/SCL - eliminates false start/stop detection in electrically noisy industrial environments. |
| 16-byte page write mode | Allows partial writes within 16-byte boundaries - reduces write overhead when updating small configuration fields. |
| Hardware write protection (WP) | Physically disables all write commands when WP = VCC - prevents accidental or malicious corruption of critical calibration or security data. |
| Ultra-low standby current | 0.8 µA max at 3.6V - extends battery life beyond 10 years in coin-cell-powered IoT endpoints. |
| ESD robustness | >4,000V HBM - withstands handling and board-level ESD events without latch-up or parametric shift. |
Applications
| Industrial Sensor Calibration | Embedded System Boot Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up or sensor recalibration; I²C interface synchronized to host controller's 400 kHz clock. Use Value: Enables field-replaceable sensor modules with persistent calibration data - eliminating re-trimming after replacement and reducing maintenance downtime. | Use Scenario: Holding bootloader parameters, secure boot keys, and peripheral initialization flags in ARM Cortex-M microcontroller-based edge gateways. IC Role / Device Role / Timing Role: Early-boot configuration source read before main firmware execution; accessed via I²C during cold start sequence. Use Value: Supports secure, tamper-resistant boot flow with hardware write protection - preventing runtime modification of critical boot settings. |
| Smart Meter Energy Tariff Tables | Medical Device Usage Logs |
Use Scenario: Storing time-of-use tariff schedules, billing cycle counters, and firmware update metadata in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: High-reliability data logger with 1M write endurance - updated daily via I²C during meter wake-up intervals. Use Value: Guarantees 10+ years of accurate billing history without wear-out - meeting ANSI C12.19 archival requirements. | Use Scenario: Recording device usage hours, calibration timestamps, and fault event logs in portable ultrasound and infusion pump controllers. IC Role / Device Role / Timing Role: Fail-safe audit trail storage - written during power-down or error conditions using interrupt-driven I²C writes. Use Value: Meets IEC 62304 Class B software safety requirements by preserving critical operational history even after unexpected shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C08C-XHM-T | Same 8-Kbit capacity and UDFN-8 package, but rated only for Standard/Fast mode (100/400 kHz), no FM+ support; lacks Fast Mode Plus timing compliance. | Not suitable where 1 MHz I²C throughput is required for rapid configuration loading. | Select AT24C08C-XHM-T only if system operates exclusively below 400 kHz and cost sensitivity outweighs future speed scalability. |
| M24C08-RMN6TP | 8-Kbit I²C EEPROM in 8-lead TSSOP; supports 1 MHz FM+, but has higher standby current (1 µA vs. 0.8 µA) and no WP pin in TSSOP variant. | Lacks hardware write protection - requires software-based locking or external logic for secure write control. | Choose M24C08-RMN6TP when TSSOP footprint is preferred and WP functionality is implemented at system level. |
Compared with AT24C08C-XHM-T and M24C08-RMN6TP, the AT24C08D-XHM-T uniquely combines 1 MHz I²C support, hardware WP, ultra-low 0.8 µA standby current, and UDFN-8 space efficiency - making it optimal for next-generation battery-powered, high-speed, secure embedded systems.
Availability
AT24C08D-XHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system boot configuration, and smart meter energy tariff table storage requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT24C08D-XHM-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 is a global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.
The AT24C08D-XHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power, and high-reliability nonvolatile data storage in space-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24C08D-XHM-T?
The AT24C08D-XHM-T supports up to 1 MHz I²C communication in Fast Mode Plus (FM+) when VCC is between 2.5V and 3.6V. At 1.7V–3.6V, it operates at 400 kHz (Fast mode) and 100 kHz (Standard mode). This 1 MHz capability enables faster configuration writes compared to legacy EEPROMs, reducing host MCU wait time during initialization sequences.
Does the AT24C08D-XHM-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C08D-XHM-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is input-only. Recommended values are 1.3 kΩ for 1 MHz, 4 kΩ for 400 kHz, and 10 kΩ for 100 kHz operation - selected based on bus capacitance and rise-time requirements per I²C specification.
How does the Write-Protect (WP) pin function on the AT24C08D-XHM-T?
When the WP pin of the AT24C08D-XHM-T is driven high (to VCC), all write operations to the entire memory array are inhibited - providing hardware-level protection against accidental or unauthorized writes. When WP is low (GND), normal read/write operations proceed. The pin is internally pulled down if left floating, but Microchip recommends hard-wiring it to a defined state for robustness.
What is the memory organization and page structure of the AT24C08D-XHM-T?
The AT24C08D-XHM-T organizes its 8-Kbit memory as 1,024 words of 8 bits each, grouped into 64 pages of 16 bytes. This enables efficient 16-byte page writes, including partial writes within a page boundary. The page structure reduces write cycle overhead versus byte-by-byte programming and aligns with common firmware update block sizes.
Is the AT24C08D-XHM-T compatible with standard I²C protocol and ACK/NACK handshaking?
Yes, the AT24C08D-XHM-T fully complies with standard I²C protocol, including Start/Stop conditions, 7-bit slave addressing with R/W bit, and 9-cycle byte transfer with ACK/NACK response. It latches data on SCL rising edge and outputs on falling edge, supports repeated Start, and implements proper acknowledge polling during write cycles - ensuring interoperability with any I²C master controller.
AT24C08D-XHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 4.5 µs
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24C08D-XHM-T FAQ
1.How can I place an order for AT24C08D-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C08D-XHM-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 AT24C08D-XHM-T reliable?
The price and inventory of AT24C08D-XHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C08D-XHM-T is usually 5 days.
3.What payment methods are accepted for AT24C08D-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C08D-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C08D-XHM-T?
AT24C08D-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C08D-XHM-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 AT24C08D-XHM-T?
For technical support, including AT24C08D-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C08D-XHM-T requirements.
6.How does Aetrix verify that AT24C08D-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C08D-XHM-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 AT24C08D-XHM-T meets industry standards.
7.What is the process for return or replacement of AT24C08D-XHM-T?
All AT24C08D-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C08D-XHM-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 AT24C08D-XHM-T part is unused and in its original packaging.
Return procedure for AT24C08D-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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