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Microchip Technology 24C08B-E/P
- Part No.:
- 24C08B-E/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
24C08B-E/P.pdf
- Description:
- IC EEPROM 8KBIT I2C 100KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,921
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Product details
Overview
24C08B-E/P from Microchip Technology Inc. is an 8K-bit I²C-compatible serial EEPROM organized as eight 256 × 8-bit memory blocks, operating from 4.5V to 5.5V with 1 mA typical active current, 10 µA standby current, and hardware write protection via the WP pin. It supports page-write up to 16 bytes and is rated for 1,000,000 erase/write cycles with >200 years data retention in automotive temperature range (–40°C to +125°C).
For engineers reviewing the 24C08B-E/P datasheet, 24C08B-E/P pinout, 24C08B-E/P application, or 24C08B-E/P equivalent, this device serves as a drop-in serial nonvolatile memory solution for automotive control modules, industrial sensor nodes, and embedded system configuration storage where robust I²C interface, extended temperature operation, and hardware write protection are required.
Technical Context
The 24C08B-E/P implements a slave-only I²C interface with fixed 4-bit device identifier (1010b) and 3-bit block-select addressing, enabling access to eight independent 256-byte memory blocks. Its internal address pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.
It features Schmitt-trigger inputs on SDA and SCL with 50 ns spike suppression and hysteresis (0.05 × VCC), slope-controlled outputs to suppress ground bounce, and a VCC threshold detector that disables write logic below 1.5 V. Write operations are self-timed with 2 ms typical page-write cycle time and 10 ms maximum byte/page cycle duration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (8,192 bits), organized as 8 × 256 × 8-bit blocks - enables modular firmware parameter storage per subsystem. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and automotive 5 V regulators without level shifting. |
| I²C Clock Frequency | Up to 100 kHz - ensures reliable communication on noisy industrial buses with minimal timing margin requirements. |
| Write Endurance | 1,000,000 erase/write cycles - supports frequent calibration or logging updates over product lifetime. |
| Data Retention | Greater than 200 years at 25°C - guarantees long-term integrity of stored configuration, calibration, or security keys. |
| Operating Temperature | –40°C to +125°C (Automotive grade) - qualified for under-hood and powertrain control unit deployment. |
| Page Write Buffer | 16-byte buffer - reduces I²C transaction count by 16× versus byte-write for contiguous data updates. |
Pinout & Package
24C08B-E/P is supplied in an 8-pin plastic DIP (300 mil body) package with through-hole mounting. Pin 1 is marked with a notch or dot; pins A0–A2 are no-connect and may be left floating or tied to VSS/VCC without functional impact.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | Primary return path for all internal circuitry; must be low-impedance connection to system GND plane. |
| SDA | Serial Data I/O | Open-drain bidirectional bus line requiring external 4.7 kΩ–10 kΩ pull-up to VCC; carries address, data, and ACK/NACK signals. |
| SCL | Serial Clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input rejects noise spikes <50 ns. |
| WP | Write Protect control | Hardware-enforced memory lock: tied to VCC → full memory read-only; tied to VSS → full read/write capability. |
| VCC | Power supply | 4.5–5.5 V DC input; internal voltage detector disables writes if VCC drops below 1.5 V nominal. |
| A0, A1, A2 | No internal connection | Unused pins; no electrical function - may be left unconnected or terminated to avoid floating. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware write protection | Single-pin (WP) enable/disable of entire memory array - eliminates software vulnerability and prevents accidental overwrites during power transitions. |
| Page-write capability | 16-byte buffer allows atomic update of configuration blocks - avoids partial writes and simplifies firmware recovery logic. |
| Noise-immune I²C interface | Schmitt-trigger inputs + 50 ns input filtering - maintains bus reliability in high-EMI environments like motor drives or ignition systems. |
| Extended temperature qualification | –40°C to +125°C operation - meets AEC-Q100 stress test requirements for automotive electronics without derating. |
| Low-power standby mode | 10 µA max ICCS at 5.5 V - enables always-on memory retention in battery-backed systems with multi-year shelf life. |
Applications
| Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing trim values, fault codes, and adaptive learning parameters in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibration constants updated infrequently but accessed on every engine start. Use Value: Hardware WP pin prevents corruption during cranking voltage dips; 125°C rating ensures reliability near exhaust manifolds. |
Use Scenario: Retaining I/O mapping, PID tuning coefficients, and user-defined logic states across power cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Serial parameter store interfaced directly to microcontroller's I²C peripheral without glue logic. Use Value: 16-byte page-write reduces configuration save time by 85% vs. byte-write; 1M endurance supports daily firmware updates over 10+ years. |
| Smart Sensor Node | Medical Diagnostic Equipment |
Use Scenario: Holding sensor offset/gain calibration data and manufacturing traceability IDs in wireless temperature/humidity transmitters. IC Role / Device Role / Timing Role: I²C slave memory storing factory-calibrated coefficients used during analog-to-digital conversion. Use Value: 200-year data retention guarantees calibration validity over equipment lifetime; 10 µA standby enables multi-year battery operation. |
Use Scenario: Securing device serial numbers, calibration history, and regulatory compliance logs in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault with hardware write-lock activated during field service mode. Use Value: WP pin tied to service-mode switch physically prevents unauthorized reprogramming; ESD >4 kV protects against handling damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC08B-I/P | Same 8K-bit I²C EEPROM architecture but rated for industrial (–40°C to +85°C) temperature range; uses same 8-pin DIP package and pinout. | Lacks automotive qualification; not suitable for under-hood or powertrain applications requiring 125°C operation. | Select when cost-sensitive industrial designs do not require extended temperature performance. |
| AT24C08D-PU | 8K-bit I²C EEPROM from Microchip (formerly Atmel); identical 8-pin PDIP package and pinout; supports 1 MHz Fast Mode (vs. 100 kHz max on 24C08B-E/P). | Higher speed I²C interface enables faster boot-time configuration loading; requires verified bus capacitance ≤400 pF. | Choose for new designs needing faster initialization or compatibility with existing AT24Cxx-based firmware stacks. |
Compared with 24C08B-E/P, the 24LC08B-I/P offers identical functionality at lower cost but lacks automotive qualification, while the AT24C08D-PU provides higher-speed I²C (1 MHz) and broader voltage range (1.7–5.5 V), making it more flexible for mixed-voltage systems but requiring layout review for signal integrity.
Availability
24C08B-E/P is available at Aetrix Electronics and suitable for automotive control units, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24C08B-E/P 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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with ISO/TS-16949:2002 certification for automotive-grade products.
The 24C08B-E/P belongs to Microchip's legacy I²C Serial EEPROM family, designed specifically for cost-sensitive, high-reliability embedded systems requiring simple, robust, and pin-efficient nonvolatile storage in harsh environments.
FAQ
What is the maximum I²C clock frequency supported by the 24C08B-E/P?
The 24C08B-E/P supports a maximum I²C clock frequency of 100 kHz, as specified in its AC characteristics table. This limit ensures reliable operation with standard open-drain bus pull-ups and accounts for propagation delays across automotive temperature ranges. It does not support Fast Mode (400 kHz) or Fast Mode Plus (1 MHz) - attempting higher frequencies may result in missed ACKs or data corruption.
Can the 24C08B-E/P be used as a read-only memory (ROM)?
Yes, the 24C08B-E/P can operate as a serial ROM by connecting the WP pin to VCC, which disables all write operations while preserving full read functionality. This configuration is commonly used for storing immutable firmware identifiers, cryptographic keys, or factory calibration data that must remain unchanged after programming.
What is the purpose of pins A0, A1, and A2 on the 24C08B-E/P?
Pins A0, A1, and A2 on the 24C08B-E/P are no-connect (NC) terminals with no internal connection. They serve no functional role in memory addressing or device operation and may be left floating, tied to VSS, or tied to VCC without affecting behavior - unlike later EEPROM families (e.g., 24LCxx), these pins do not encode device address bits.
How many bytes can be written in a single page-write operation for the 24C08B-E/P?
The 24C08B-E/P supports a 16-byte page-write buffer, allowing up to 16 contiguous bytes to be loaded into the internal latch and committed to memory with one STOP condition. Writing beyond 16 bytes within a single page-write command causes address wraparound within the same physical page, potentially overwriting earlier data in that page.
Is the 24C08B-E/P still recommended for new designs?
No - the official Microchip datasheet (DS21081G) explicitly states "Obsolete Device. Please use 24LC08B or 24LC16B." While 24C08B-E/P remains available through legacy distribution channels and is fully functional, new designs should migrate to the 24LC08B series, which offers improved process technology, enhanced ESD robustness, and ongoing lifecycle support.
24C08B-E/P 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:
- 256 x 8 x 4
- Memory Interface:
- I2C
- Clock Frequency:
- 100 kHz
- Write Cycle Time - Word, Page:
- 1ms
- Access Time:
- 3.5 µs
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
24C08B-E/P FAQ
1.How can I place an order for 24C08B-E/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 24C08B-E/P 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 24C08B-E/P reliable?
The price and inventory of 24C08B-E/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24C08B-E/P is usually 5 days.
3.What payment methods are accepted for 24C08B-E/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24C08B-E/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24C08B-E/P?
24C08B-E/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24C08B-E/P 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 24C08B-E/P?
For technical support, including 24C08B-E/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24C08B-E/P requirements.
6.How does Aetrix verify that 24C08B-E/P is sourced from the original manufacturer or authorized distributors?
All 24C08B-E/P 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 24C08B-E/P meets industry standards.
7.What is the process for return or replacement of 24C08B-E/P?
All 24C08B-E/P units undergo pre-shipment inspection (PSI). If there is an issue with 24C08B-E/P, 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 24C08B-E/P part is unused and in its original packaging.
Return procedure for 24C08B-E/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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