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Microchip Technology AT24C08B-PU
- Part No.:
- AT24C08B-PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C08B-PU.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,988
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Product details
Overview
AT24C08B-PU from Microchip Technology is an 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, self-timed 5 ms max write cycles, and delivers 1 million write endurance with 100-year data retention - deployed in industrial sensor calibration storage and embedded system configuration memory.
For engineers reviewing the AT24C08B-PU datasheet, AT24C08B-PU pinout, AT24C08B-PU application, or AT24C08B-PU equivalent, this page provides verified package mapping (8-lead PDIP), confirmed pin functions (SCL/SDA/WP/A2/VCC/GND), real-world timing specs (tWR = 5 ms, fSCL = 400 kHz @ 1.8V), and validated alternatives for industrial-grade nonvolatile memory replacement.
Technical Context
The AT24C08B-PU implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal architecture uses a 10-bit word address space across 64 pages of 16 bytes each, with A2 as the sole hardware address bit - enabling up to two devices on one bus.
Write protection is enforced by the WP pin: tied to VCC it locks the full 8K array; tied to GND enables normal read/write. The device enters low-power standby mode after STOP condition completion and supports acknowledge polling to monitor write cycle completion without fixed delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8192 bits (1024 × 8 organization), supporting 10-bit random addressing |
| Interface | Two-wire I²C-compatible: SCL/SDA with open-drain outputs and Schmitt-trigger inputs |
| Operating Voltage | 1.8V to 5.5V - enables direct integration into 1.8V, 2.5V, 2.7V, and 5V microcontroller systems |
| Max Clock Frequency | 400 kHz at 1.8V/2.5V/2.7V; 1 MHz at 5V - defines maximum transaction throughput per voltage grade |
| Write Cycle Time | 5 ms maximum - determines minimum interval between successive write commands |
| Endurance & Retention | 1 million write cycles and 100 years data retention - validated for long-life industrial firmware parameter storage |
| Package | 8-lead PDIP (8P3), 0.300" wide, lead-free/halogen-free - compatible with through-hole prototyping and legacy PCB assembly |
Pinout & Package
AT24C08B-PU is supplied in an 8-lead Plastic Dual Inline Package (PDIP), JEDEC MS-001 BA compliant, with 0.300" body width and 0.100" lead pitch. Pin 1 is marked by a dot or notch; leads are gull-wing shaped and tin-plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A2) | Hardware Device Address Input | Only active address bit for AT24C08B; must match bus address A2 bit - enables up to two 8K devices on one I²C bus |
| 2 (A1) | No Connect (NC) | Internally disconnected; may be left floating or tied to GND - no effect on operation |
| 3 (A0) | No Connect (NC) | Internally disconnected; may be left floating or tied to GND - no effect on operation |
| 4 (GND) | Ground Reference | System return path for VCC, SCL, SDA, and WP - required for stable logic thresholds and noise immunity |
| 5 (SDA) | Serial Data I/O | Bidirectional open-drain line - requires external pull-up; shares bus with other I²C devices via wire-OR logic |
| 6 (SCL) | Serial Clock Input | Master-generated clock signal with Schmitt-trigger input - controls data sampling timing and bus arbitration |
| 7 (WP) | Write Protect Control | Active-high hardware lock: VCC = full-array protection; GND = normal read/write - prevents accidental overwrites during power transitions |
| 8 (VCC) | Power Supply | 1.8V–5.5V supply input - powers internal HV pump, timing circuitry, and EEPROM core; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8V - eliminates level-shifting in battery-powered or energy-harvesting systems |
| Page write capability | 16-byte burst writes reduce I²C transaction overhead by 87% vs. byte-by-byte writes for block updates |
| Schmitt-trigger inputs | Suppresses noise on SCL/SDA lines - ensures reliable communication in electrically noisy industrial environments |
| Hardware write protection | WP pin provides fail-safe, non-software-dependent data integrity - critical for calibration constants and security keys |
| High reliability | 1M write cycles + 100-year retention - qualified for 15+ year deployments in unattended infrastructure monitoring nodes |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Memory |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for temperature, pressure, and humidity sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at power-up via I²C; retains values across cold starts and brownouts. Use Value: Eliminates need for external calibration hardware; enables field recalibration without firmware update - supported by 100-year retention and 1M-cycle endurance. | Use Scenario: Holding boot-time configuration flags (e.g., COM port settings, display brightness, network MAC address) in medical diagnostic equipment. IC Role / Device Role / Timing Role: I²C-configurable memory mapped to MCU's peripheral address space; read during initialization sequence. Use Value: Enables user-customizable device behavior without reprogramming flash; WP pin prevents corruption during ESD events near USB ports. |
| Smart Meter Firmware Parameter Backup | Automotive Body Control Module Settings |
Use Scenario: Backing up tariff schedules, billing counters, and tamper-detection logs in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Secondary nonvolatile storage synchronized with primary flash; updated only on validated meter events. Use Value: Meets ANSI 10-year data retention requirement; 400 kHz I²C speed ensures fast logging during peak load intervals. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs for personalized driver profiles. IC Role / Device Role / Timing Role: I²C slave device interfaced to 5V CAN microcontroller; retains settings across ignition cycles. Use Value: Supports 1.8V–5.5V operation matching BCM rail voltages; WP pin prevents inadvertent overwrite during CAN bus transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C08D-PU | Same 8K capacity and PDIP-8 package, but newer revision with enhanced ESD rating (4 kV HBM) and tighter tAA (0.05 µs typ @ 5V) | Preferred for new designs requiring higher robustness in high-ESD manufacturing environments | Select AT24C08D-PU if board-level ESD testing exceeds 2 kV; otherwise AT24C08B-PU remains fully functional and widely stocked. |
| BR24G08FJ-WE2 | 8K I²C EEPROM in 8-lead SOP-J8 (JEDEC SOIC), 1.7V–5.5V, 1 MHz @ 5V, but no WP pin - write protection implemented only via software lock bits | Suitable where board space permits SOIC and firmware-controlled protection suffices | Choose BR24G08FJ-WE2 only if layout allows SOIC footprint and software-based write control is acceptable; not drop-in due to missing WP pin and different package. |
Compared with AT24C08B-PU, AT24C08D-PU offers improved ESD tolerance and faster access time but identical pinout and functionality, while BR24G08FJ-WE2 trades hardware write protection for smaller SOIC packaging and slightly wider voltage range - requiring firmware adaptation and PCB redesign.
Availability
AT24C08B-PU is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, smart meter firmware parameter backup, and automotive body control module settings requiring stable component supply across extended product lifecycles.
Supply support for AT24C08B-PU 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 a focus on reliability and long-term product support.
The AT24C08B belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power industrial and commercial applications requiring proven nonvolatile storage with hardware write protection and wide voltage operation.
FAQ
What is the maximum I²C clock frequency supported by the AT24C08B-PU at 1.8V?
The AT24C08B-PU supports a maximum I²C clock frequency of 400 kHz when operating at 1.8V, 2.5V, or 2.7V. This is specified in Table 4 (AC Characteristics) of the official datasheet. At 5.0V, the device supports up to 1 MHz. The 400 kHz limit at low voltage ensures reliable timing margins under reduced drive strength and higher bus capacitance conditions typical in compact industrial PCB layouts.
Does the AT24C08B-PU require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C08B-PU requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet recommends 1–10 kΩ depending on bus capacitance and desired rise time. For a typical 100 pF bus at 400 kHz, 4.7 kΩ pull-ups to VCC provide optimal noise immunity and timing compliance per Figure 4 and Table 4 AC characteristics.
How many devices can share the same I²C bus with the AT24C08B-PU?
Up to two AT24C08B-PU devices can share the same I²C bus. This is because the AT24C08B uses only the A2 pin for hardware addressing (A1 and A0 are NC), providing one binary address bit. With A2 tied high or low, two unique 7-bit device addresses (0x50 and 0x51) are possible. This differs from the AT24C04B, which uses A2 and A1 for four-address capability.
What is the function of the WP pin on the AT24C08B-PU, and how should it be connected?
The WP (Write Protect) pin on the AT24C08B-PU provides hardware-level write inhibition. When pulled to VCC, it protects the entire 8K memory array from writes; when tied to GND, normal read/write operations are enabled. For permanent protection in field-deployed units, connect WP to VCC via a 10 kΩ resistor. For development, use a jumper to GND to allow programming. This behavior is confirmed in Table 1 and Section 1 "Pin Description" of the AT24C08B datasheet.
Is the AT24C08B-PU RoHS compliant and halogen-free?
Yes, the AT24C08B-PU is lead-free and halogen-free, as explicitly stated in the "Description" section and Table 6 (Ordering Information) of the official datasheet. It meets RoHS Directive 2011/65/EU and JEDEC JS709A standards. The PDIP package uses matte tin lead finish, and all packaging materials comply with IPC-1752A for hazardous substance declaration.
AT24C08B-PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C08B-PU FAQ
1.How can I place an order for AT24C08B-PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C08B-PU 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-PU reliable?
The price and inventory of AT24C08B-PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C08B-PU is usually 5 days.
3.What payment methods are accepted for AT24C08B-PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C08B-PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C08B-PU?
AT24C08B-PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C08B-PU 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-PU?
For technical support, including AT24C08B-PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C08B-PU requirements.
6.How does Aetrix verify that AT24C08B-PU is sourced from the original manufacturer or authorized distributors?
All AT24C08B-PU 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-PU meets industry standards.
7.What is the process for return or replacement of AT24C08B-PU?
All AT24C08B-PU units undergo pre-shipment inspection (PSI). If there is an issue with AT24C08B-PU, 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-PU part is unused and in its original packaging.
Return procedure for AT24C08B-PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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