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Microchip Technology AT24C08C-XHM-B
- Part No.:
- AT24C08C-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C08C-XHM-B.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:358
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Product details
Overview
AT24C08C-XHM-B from Microchip Technology is an 8-Kbit I²C-compatible serial EEPROM organized as 1,024 × 8-bit memory, 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 WP pin - used for nonvolatile configuration storage in microcontroller-based embedded systems.
For engineers reviewing the AT24C08C-XHM-B datasheet, AT24C08C-XHM-B pinout, AT24C08C-XHM-B application, or AT24C08C-XHM-B equivalent, this page delivers verified electrical specs, validated 8-pin UDFN package mapping, confirmed I²C timing compliance (100/400/1000 kHz), real-world memory endurance (1M cycles), and precise alternative part comparisons - all grounded in Microchip DS20006127B.
Technical Context
The AT24C08C-XHM-B implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. It supports standard (100 kHz), fast (400 kHz), and fast mode plus (1 MHz) clock rates depending on VCC level, with strict AC timing including tLOW ≤ 500 ns and tAA ≤ 450 ns at 2.5–5.5V.
Internally organized as 64 pages of 16 bytes each, it enables partial and full-page writes with self-timed write cycles ≤5 ms, hardware address selection via A2 (A1 is NC), and write protection controlled by the WP pin - which inhibits all writes when pulled high, while floating defaults to GND via internal pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8,192 bits (1,024 × 8-bit words) - sufficient for firmware calibration tables, device ID storage, or boot configuration in space-constrained designs. |
| Supply Voltage Range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
| I²C Clock Support | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz (2.5–5.5V) - allows high-speed configuration loading in power-sensitive applications. |
| Write Endurance | 1,000,000 cycles - supports frequent runtime parameter updates (e.g., metering logs, sensor offsets) over product lifetime. |
| Data Retention | 100 years at 55°C - ensures long-term reliability of stored calibration or security keys without refresh. |
| Standby Current | ≤6 μA at 5.5V - minimizes quiescent power in battery-backed or energy-harvesting systems. |
| Write-Protect Logic | WP = VCC disables all writes; WP = GND enables writes - provides hardware-level security against accidental overwrites. |
Pinout & Package
AT24C08C-XHM-B is packaged in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) with exposed pad - compatible with automated reflow assembly and suitable for compact PCB layouts. Pin 1 is NC; pins 2–8 map to A2, GND, VCC, WP, SCL, SDA, and NC respectively (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad - must be left unconnected; no routing or soldering required. |
| 2 (A2) | Device Address Input | Hardwired to GND/VCC to set LSB of I²C slave address (0x50–0x53); enables up to two AT24C08C devices on one bus. |
| 3 (GND) | Ground Reference | System return path for VCC and I/O; recommended to connect exposed pad to GND for thermal and EMI performance. |
| 4 (VCC) | Power Supply | 1.7–5.5V supply input; requires local 100 nF decoupling capacitor placed within 5 mm of pin. |
| 5 (WP) | Write-Protect Control | Active-high hardware lock: logic high blocks all write operations; internally pulled down if floating. |
| 6 (SCL) | Serial Clock Input | Open-drain compatible; requires external pull-up (≤10 kΩ); rising edge latches input data, falling edge clocks output data. |
| 7 (SDA) | Serial Data I/O | Bidirectional open-drain line; shared across I²C bus; requires external pull-up (≤10 kΩ); must remain stable during SCL high. |
| 8 (NC) | No Connect | Unbonded die pad - electrically isolated; no connection or routing needed. |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte Page Write Mode | Enables efficient burst writes without requiring full-memory erase - reduces write latency and extends EEPROM lifespan. |
| Schmitt Trigger Inputs | Suppresses bus noise and prevents false triggering on SDA/SCL - improves robustness in electrically noisy industrial environments. |
| Self-Timed Write Cycle | Hardware-managed ≤5 ms internal write completion - eliminates need for software polling delay or timeout management. |
| ESD Protection >4 kV | Withstands human-body-model electrostatic discharge - enhances field reliability during handling and system integration. |
| Green Packaging | Lead-free, halide-free, RoHS-compliant UDFN - meets global environmental compliance requirements for industrial and consumer products. |
Applications
| Industrial Sensor Node | Smart Meter Calibration Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor coefficients and linearization tables in wireless temperature/humidity nodes. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during MCU boot and runtime recalibration. Use Value: Enables field-deployable accuracy without firmware updates; leverages 100-year data retention and 1M write cycles for periodic offset correction. |
Use Scenario: Holding utility-specific tariff tables, metering constants, and tamper-event logs in electricity/water meters. IC Role / Device Role / Timing Role: Secure, low-power parameter store interfaced via I²C to metrology SoC during initialization and event capture. Use Value: WP pin prevents unauthorized firmware or tariff changes; 1.7V operation supports brownout-safe logging during power dips. |
| IoT Edge Gateway Boot Config | Medical Device Settings Backup |
|
Use Scenario: Persisting network credentials, TLS certificate fingerprints, and OTA update state in cellular/Wi-Fi gateways. IC Role / Device Role / Timing Role: I²C-configurable boot-time configuration register accessed before main application launch. Use Value: 1 MHz Fast Mode Plus enables rapid config load at boot; 6 μA standby current preserves battery during deep sleep. |
Use Scenario: Backing up user-adjusted therapy parameters and calibration history in portable infusion pumps or diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe settings memory that retains critical data across power cycles and resets. Use Value: Hardware write-protection (WP) ensures regulatory-compliant immutability of safety-critical settings; industrial temp range covers clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C08D-XHM-B | Same 8-Kbit capacity and UDFN-8 package, but supports extended voltage range (1.6V–5.5V) and enhanced ESD (6 kV HBM). | Preferred where ultra-low-voltage operation (<1.7V) or higher ESD immunity is required in medical or automotive subsystems. | Select AT24C08D-XHM-B only if design mandates sub-1.7V operation or >4 kV ESD margin; otherwise AT24C08C-XHM-B offers identical functionality at lower cost. |
| M24C08-RMN6TP | 8-Kbit I²C EEPROM in 8-lead TSSOP; supports 100/400 kHz modes only (no 1 MHz FM+); max VCC = 5.5V, min = 1.8V. | Suitable for legacy designs using TSSOP footprint and not requiring 1 MHz speed or 1.7V operation. | Choose M24C08-RMN6TP only for drop-in replacement in existing TSSOP layouts; not pin-compatible with UDFN AT24C08C-XHM-B due to different package and pinout. |
Compared with AT24C08C-XHM-B, AT24C08D-XHM-B adds 0.1V lower VCC headroom and 2 kV higher ESD rating but shares identical memory architecture and I²C protocol; M24C08-RMN6TP trades FM+ speed and UDFN size for TSSOP compatibility and broader vendor availability - making it viable only in footprint-matched legacy upgrades.
Availability
AT24C08C-XHM-B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter calibration storage, and IoT edge gateway boot configuration requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24C08C-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and embedded system integration.
The AT24C08C-XHM-B belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-power, space-constrained applications requiring robust nonvolatile storage in industrial, medical, and consumer electronics.
FAQ
What is the maximum I²C clock frequency supported by AT24C08C-XHM-B?
The AT24C08C-XHM-B supports 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), and 1 MHz Fast Mode Plus (2.5–5.5V). At 1.7–2.4V, only standard and fast modes apply. This graded speed support allows designers to optimize bus throughput based on system voltage and noise environment - critical for balancing speed and signal integrity in mixed-voltage systems.
Does AT24C08C-XHM-B require external pull-up resistors on SDA and SCL lines?
Yes, AT24C08C-XHM-B requires external pull-up resistors on both SDA and SCL lines because both pins are open-drain. Microchip specifies ≤10 kΩ for reliable operation; typical values are 4.7 kΩ at 3.3V and 2.2 kΩ at 5V. Pull-ups ensure proper logic high levels and meet rise-time requirements (tR ≤ 300 ns), especially under capacitive bus loads - omission causes communication failure or intermittent ACK errors.
How does the write-protect (WP) pin function on AT24C08C-XHM-B?
On AT24C08C-XHM-B, the WP pin is active-high: when pulled to VCC, it disables all write operations to the entire memory array; when pulled to GND, writes are enabled. If left floating, the internal pull-down defaults WP to GND, enabling writes - but Microchip recommends hardwiring WP to avoid noise-induced glitches. This hardware lock provides deterministic, glitch-immune protection independent of firmware state.
What is the memory organization of AT24C08C-XHM-B?
AT24C08C-XHM-B is organized as 1,024 words × 8 bits (8,192 total bits), structured into 64 pages of 16 bytes each. This layout enables efficient page-write operations - allowing up to 16 bytes to be written in a single I²C transaction - reducing bus overhead and improving write throughput compared to byte-by-byte writes. The page boundary alignment is fixed and documented in Microchip DS20006127B Section 6.
Is AT24C08C-XHM-B pin-compatible with AT24C04C-XHM-B?
No, AT24C08C-XHM-B is not pin-compatible with AT24C04C-XHM-B in the same package variant. While both use the 8-pad UDFN package, the AT24C04C has an A1 pin (pin 2) for device addressing, whereas AT24C08C-XHM-B replaces A1 with NC (no connect). This difference means direct substitution requires PCB layout revision - even though pin numbering and physical footprint match, the functional pin assignment diverges at pin 2.
AT24C08C-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:
- 8Kbit
- Memory Organization:
- 1K 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
AT24C08C-XHM-B FAQ
1.How can I place an order for AT24C08C-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C08C-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 AT24C08C-XHM-B reliable?
The price and inventory of AT24C08C-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 AT24C08C-XHM-B is usually 5 days.
3.What payment methods are accepted for AT24C08C-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C08C-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C08C-XHM-B?
AT24C08C-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C08C-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 AT24C08C-XHM-B?
For technical support, including AT24C08C-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C08C-XHM-B requirements.
6.How does Aetrix verify that AT24C08C-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24C08C-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 AT24C08C-XHM-B meets industry standards.
7.What is the process for return or replacement of AT24C08C-XHM-B?
All AT24C08C-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C08C-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 AT24C08C-XHM-B part is unused and in its original packaging.
Return procedure for AT24C08C-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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