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Microchip Technology AT24C08B-TH-B
- Part No.:
- AT24C08B-TH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C08B-TH-B.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
AT24C08B-TH-B from Microchip Technology (formerly Atmel) is a 8K-bit (1024 × 8) two-wire serial EEPROM with 1.8V to 5.5V operation, 400 kHz I²C interface at 1.8V/2.5V/2.7V, and hardware write protection via WP pin. It supports 16-byte page writes, 5 ms max self-timed write cycle, and is rated for 1 million write cycles and 100 years data retention. It is used in industrial sensor calibration storage and embedded system configuration memory.
For engineers reviewing the AT24C08B-TH-B datasheet, AT24C08B-TH-B pinout, AT24C08B-TH-B application, or AT24C08B-TH-B equivalent, key selection factors include its TSSOP-8 package (8A2), 10-bit addressing, A2-only hardware address input, and compatibility with low-voltage microcontroller I²C buses requiring robust nonvolatile parameter storage.
Technical Context
The AT24C08B-TH-B implements a standard two-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SCL and SDA inputs. Its internal architecture uses a 10-bit word address counter and 64-page (16 bytes/page) memory organization, enabling random and sequential read/write operations without external address latches.
Device addressing is fixed to 1010b for the upper nibble, with only the A2 pin used as a hardware address bit - A0 and A1 are no-connects. Write protection is controlled solely by the WP pin state: grounded for full read/write access, tied to VCC to lock the entire array.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8192 bits (1024 × 8), organized as 64 pages of 16 bytes each - enables efficient block-level configuration storage |
| Interface | Two-wire I²C-compatible bus with bidirectional open-drain SDA and edge-triggered SCL - interoperable with standard MCU I²C peripherals |
| Operating voltage | 1.8 V to 5.5 V - supports direct interfacing with 1.8V, 2.5V, 2.7V, 3.3V, and 5V logic systems without level shifters |
| Write speed | 400 kHz max at 1.8V/2.5V/2.7V; 1 MHz at 5V - determines maximum byte/page write throughput in low-power vs. high-speed modes |
| Data endurance | 1,000,000 write cycles - ensures reliable field updates for firmware parameters or calibration data over product lifetime |
| Data retention | 100 years at +25°C - guarantees long-term integrity of stored settings without refresh or backup power |
| Write protect | Hardware-enabled via WP pin: VCC = full-array protection, GND = normal read/write - eliminates software-only vulnerability in safety-critical systems |
Pinout & Package
AT24C08B-TH-B is packaged in an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), designated 8A2 per Microchip's ordering scheme - body size 4.4 mm × 3.0 mm, 0.65 mm pitch, 1.20 mm max height, with gull-wing leads and pin 1 indicator dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | No-connect (NC) | Internally unused; must be grounded or left floating - no effect on device addressing or operation |
| A1 | No-connect (NC) | Internally unused; must be grounded or left floating - no effect on device addressing or operation |
| A2 | Hardware device address input | Defines LSB of 3-bit hardware address (1010xxxA2); allows up to two AT24C08B devices on same I²C bus |
| GND | Ground reference | Return path for VCC and all I/O signals; required for proper biasing of internal circuitry and noise immunity |
| SCL | Serial clock input | Positive-edge sampled clock for data-in; negative-edge sampled clock for data-out - synchronizes all I²C transactions |
| SDA | Serial data bidirectional I/O | Open-drain line shared across multiple I²C devices; requires external pull-up resistor (typically 2.2–10 kΩ) |
| WP | Write protect control | Active-high hardware lock: VCC disables all writes to memory array; GND enables full read/write access |
| VCC | Power supply | Primary supply rail (1.8–5.5 V); powers EEPROM core, interface logic, and internal high-voltage pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8 V - enables direct integration into battery-powered or energy-harvesting systems without voltage boosting |
| Page write capability | 16-byte atomic page writes - reduces I²C transaction overhead and improves write efficiency versus byte-by-byte programming |
| Noise-suppressed inputs | Schmitt-trigger + digital filtering on SCL/SDA - rejects EMI and contact bounce in industrial environments with long trace runs |
| Self-timed write cycle | Internal timing completes erase/write in ≤5 ms - eliminates need for host MCU to poll status or manage variable write latency |
| Hardware write protection | Dedicated WP pin with VCC/GND logic - provides fail-safe, tamper-resistant memory locking independent of firmware state |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables in pressure, humidity, or current sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during sensor power-up or periodic self-test; no real-time timing constraints. Use Value: Enables plug-and-play accuracy without host MCU intervention; retains values across power cycles and field reprogramming. | Use Scenario: Holding boot configuration flags, network MAC addresses, and user preferences in networked IoT gateways or PLC modules. IC Role / Device Role / Timing Role: Persistent settings store accessed once per boot or on-demand via I²C; operates outside critical timing paths. Use Value: Eliminates need for external NVRAM or battery-backed SRAM; simplifies BOM and improves long-term reliability. |
| Medical Device Settings Backup | Automotive Body Control Module |
Use Scenario: Archiving therapy parameters, usage logs, and safety thresholds in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, infrequently updated storage for regulatory-compliant audit trails and user-configurable limits. Use Value: Meets IEC 62304 data integrity requirements; 1M endurance supports >10 years of daily updates. | Use Scenario: Retaining seat/mirror position presets, lighting profiles, and door lock configurations in automotive BCMs. IC Role / Device Role / Timing Role: Low-power, vibration-resistant memory accessed during vehicle wake-up or user input events. Use Value: Operates reliably across –40°C to +125°C ambient; WP pin prevents accidental overwrites during CAN/LIN bus noise events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C08D-TH-B | Same 8K-bit capacity and TSSOP-8 package; newer revision with enhanced ESD rating (4 kV HBM) and tighter tAA (0.05 µs typ at 5V) | Preferred where higher robustness against board-level ESD events is required, e.g., consumer-facing ports or unshielded connectors | Select AT24C08D-TH-B if new design allows component revision upgrade and ESD margin is critical; pinout and firmware are identical. |
| M24C08-RMN6TP | 8K-bit I²C EEPROM in TSSOP-8; supports 1 MHz at 2.5–5.5 V but not 1.8 V; write cycle time 5 ms same; WP pin present | Suitable for 2.5V+ systems only; lacks 1.8V support - excludes ultra-low-power or mixed-voltage designs | Choose M24C08-RMN6TP when operating exclusively above 2.5 V and STMicroelectronics supply chain alignment is preferred. |
Compared with AT24C08B-TH-B, AT24C08D-TH-B offers improved ESD tolerance without layout or firmware changes, while M24C08-RMN6TP trades 1.8V compatibility for marginally faster timing at higher voltages - both require validation of WP behavior and page-write timing in target application.
Availability
AT24C08B-TH-B is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, medical device settings backup, and automotive body control module applications requiring stable component supply and long-term lifecycle support.
Supply support for AT24C08B-TH-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 devices, and memory solutions, with strong focus on industrial, automotive, and aerospace reliability standards.
The AT24C08B belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-power, space-constrained embedded systems needing dependable nonvolatile storage with minimal external components and broad voltage compatibility.
FAQ
What is the memory organization of the AT24C08B-TH-B?
The AT24C08B-TH-B contains 8192 bits of EEPROM memory, internally organized as 1024 words of 8 bits each (1024 × 8). This corresponds to 64 pages of 16 bytes each, requiring a 10-bit data word address for random access. The AT24C08B-TH-B uses only the A2 pin for hardware device addressing, with A0 and A1 as no-connects - a key distinction from the 4K AT24C04B variant.
Does the AT24C08B-TH-B support 1.8V operation?
Yes, the AT24C08B-TH-B fully supports 1.8V operation across its entire functional range: it operates from 1.8 V to 5.5 V, delivers 400 kHz I²C communication at 1.8V, and maintains full read/write capability including page writes and WP functionality. This makes the AT24C08B-TH-B suitable for ultra-low-power applications such as battery-operated sensors and wearables.
What package type is used for the AT24C08B-TH-B?
The AT24C08B-TH-B uses an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), designated as 8A2 in Microchip's packaging nomenclature. It measures 4.4 mm × 3.0 mm with 0.65 mm lead pitch, gull-wing leads, and a pin 1 indicator dot - compatible with standard surface-mount assembly processes and IPC Class 2/3 reflow profiles.
How does the write protect (WP) pin function on the AT24C08B-TH-B?
On the AT24C08B-TH-B, the WP pin provides hardware-level write protection: when pulled to VCC, the entire memory array is locked against write or erase operations; when grounded, full read/write access is enabled. This behavior is independent of I²C commands and persists across power cycles - a critical feature for preventing corruption during brown-out or firmware faults.
Can the AT24C08B-TH-B be used interchangeably with the AT24C04B-TH-B?
No, the AT24C08B-TH-B and AT24C04B-TH-B are not interchangeable. While both share the same TSSOP-8 package and 1.8V–5.5V operation, they differ in memory size (8K vs. 4K), addressing (A2-only vs. A2+A1), page count (64 vs. 32), and required address bits (10-bit vs. 9-bit). Firmware and hardware design must be validated separately for each part - using AT24C08B-TH-B in place of AT24C04B-TH-B may cause address wraparound or incomplete data writes.
AT24C08B-TH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24C08B-TH-B FAQ
1.How can I place an order for AT24C08B-TH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C08B-TH-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 AT24C08B-TH-B reliable?
The price and inventory of AT24C08B-TH-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C08B-TH-B is usually 5 days.
3.What payment methods are accepted for AT24C08B-TH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C08B-TH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C08B-TH-B?
AT24C08B-TH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C08B-TH-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 AT24C08B-TH-B?
For technical support, including AT24C08B-TH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C08B-TH-B requirements.
6.How does Aetrix verify that AT24C08B-TH-B is sourced from the original manufacturer or authorized distributors?
All AT24C08B-TH-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 AT24C08B-TH-B meets industry standards.
7.What is the process for return or replacement of AT24C08B-TH-B?
All AT24C08B-TH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C08B-TH-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 AT24C08B-TH-B part is unused and in its original packaging.
Return procedure for AT24C08B-TH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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