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Microchip Technology 24LC08B/ST
- Part No.:
- 24LC08B/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC08B/ST.pdf
- Description:
- IC EEPROM 8KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,714
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Product details
Overview
24LC08B/ST from Microchip Technology Inc. is an 8-Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit memory blocks. It operates from 2.5V to 5.5V, supports up to 400 kHz clock frequency, features hardware write-protection via the WP pin, and delivers ≤1 µA standby current at industrial temperature range (–40°C to +85°C). It is commonly used in embedded system configuration storage where low-voltage operation and noise-immune I²C interface are required.
For engineers reviewing the 24LC08B/ST datasheet, 24LC08B/ST pinout, 24LC08B/ST application, or 24LC08B/ST equivalent, key selection criteria include VCC range (2.5–5.5V), I²C timing compliance (400 kHz max), WP-enabled hardware protection, 16-byte page write buffer, and SOIC-8 package compatibility with legacy board layouts.
Technical Context
The 24LC08B/ST implements a two-wire I²C bus protocol with Schmitt-trigger inputs and output slope control to suppress ground bounce and bus noise. Its internal architecture includes a 16-byte page latch, address pointer logic, and HV generator for EEPROM programming - enabling self-timed erase/write cycles without external high-voltage supply.
It uses a fixed 4-bit device identifier (1010) plus 2-bit block select (B1/B0) and R/W bit for addressing - supporting four independent 256-word memory blocks. Acknowledge polling is supported to detect write completion, and the WP pin provides full-array hardware write-inhibition when tied to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1024 × 8), organized as four 256-word blocks - enables segmented data management and selective block protection. |
| VCC Range | 2.5V to 5.5V - restricts use to systems with stable ≥2.5V supply; excludes 1.7–2.49V operation supported by 24AA08/24FC08. |
| Max Clock Frequency | 400 kHz - defines maximum I²C bus speed; requires SCL rise/fall times ≤300 ns at VCC ≥2.5V. |
| Page Write Buffer | 16 bytes - allows burst writes within a single physical page boundary (0–15, 16–31, etc.), reducing bus overhead vs. byte writes. |
| Write Cycle Time | 5 ms maximum - sets minimum interval between write commands; impacts firmware timeout design for ACK polling. |
| Endurance & Retention | 1 million erase/write cycles and >200 years data retention - qualifies for long-life industrial logging and calibration storage. |
| Temperature Range | Industrial: –40°C to +85°C - validated for automotive cabin modules, industrial controllers, and power supply monitoring circuits. |
Pinout & Package
24LC08B/ST is supplied in 8-Lead SOIC (SN) package per Microchip drawing C04-057-SN Rev F. Pin 1 is marked with a beveled corner or notch; exposed pad is not present in SOIC variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | Must be connected to system GND; serves as return path for all internal currents and I²C pull-up resistors. |
| WP | Hardware write-protect input | Tie to VCC to disable all write operations (000h–3FFh); tie to VSS to enable full read/write access. |
| SCL | Serial clock input | Open-drain compatible; requires external pull-up; synchronizes all address/data transfers on rising edge. |
| SDA | Serial data bidirectional I/O | Open-drain; requires external pull-up; carries addresses, data, and ACK/NACK signals on same line. |
| VCC | Power supply | Supplies core logic and EEPROM array; must remain stable during write cycles to prevent corruption. |
| A0, A1, A2 | No-connect (NC) | Internally unconnected; may be left floating or tied to VSS/VCC without functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Provides 0.05×VCC hysteresis on SDA/SCL - rejects noise spikes <50 ns and ensures robust operation on electrically noisy PCBs. |
| Output slope control | Controls SDA fall time to ≤250 ns - eliminates ground bounce during fast transitions, preventing false Start/Stop detection. |
| Page write capability | Accepts up to 16 bytes before initiating internal write - reduces I²C transaction count by 94% vs. 16 separate byte writes. |
| Hardware write-protection | WP pin disables all write operations when high - prevents accidental overwrites during firmware updates or brown-out conditions. |
| I²C bus compatibility | Fully compliant with standard-mode (100 kHz) and fast-mode (400 kHz) I²C specifications - interoperable with microcontrollers, PMICs, and sensors using standard drivers. |
Applications
| Industrial Sensor Calibration Storage | Automotive Body Control Module (BCM) |
|---|---|
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 configuration memory accessed via I²C during system boot or sensor initialization; no real-time timing constraints. Use Value: Enables field-replaceable sensor modules with persistent calibration data, eliminating need for reprogramming after power loss. | Use Scenario: Holding seat position presets, mirror angle settings, and lighting profiles in vehicle BCMs across ignition cycles. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to BCM MCU over 400 kHz I²C bus; accessed only during user setup or power-on reset. Use Value: Supports AEC-Q100 qualified operation at –40°C to +85°C and withstands >1M write cycles for lifetime user preference storage. |
| Medical Infusion Pump Configuration | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing drug library metadata, dose limits, and alarm thresholds in battery-backed infusion pumps requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure configuration store with hardware WP pin tied to MCU-controlled GPIO - prevents runtime corruption during firmware updates. Use Value: Meets IEC 62304 safety requirements via deterministic write protection and >200-year data retention for audit logs. | Use Scenario: Maintaining tariff schedules, CT/PT ratios, and communication credentials in ANSI C12.19-compliant utility meters. IC Role / Device Role / Timing Role: I²C EEPROM accessed by metering SoC during cold start; WP pin hardwired to VCC to lock critical parameters. Use Value: Ensures parameter integrity against voltage transients and ESD events (>4 kV HBM), validated per IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA08-I/P | Wider VCC range (1.7–5.5V); supports 100 kHz at 1.7–2.49V; same 8Kbit density and SOIC-8 package. | Enables battery-powered devices operating down to 1.7V; lacks extended temp grade support beyond industrial range. | Select when ultra-low-voltage operation is required and 400 kHz speed is not needed. |
| 24FC08-I/P | Supports 1 MHz I²C clock; 1.7–5.5V VCC; includes E-temp grade (–40°C to +125°C); same pinout and memory map. | Suitable for high-speed data logging in engine control units; requires tighter SCL timing (260 ns max THIGH). | Select when higher throughput or extended temperature operation is mandatory. |
Compared with 24LC08B/ST, 24AA08-I/P offers lower-voltage flexibility but reduced speed, while 24FC08-I/P delivers faster I²C and wider temperature tolerance at the cost of stricter layout and timing validation.
Availability
24LC08B/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical infusion pump configuration, and smart energy meter firmware parameter storage requiring stable component supply and long-term lifecycle support.
Supply support for 24LC08B/ST 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 manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions with global manufacturing and quality certifications.
The 24LC08B belongs to Microchip's 24XX08 family of I²C serial EEPROMs designed for reliable, low-power configuration and calibration storage in space-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the 24LC08B/ST?
The 24LC08B/ST supports up to 400 kHz I²C clock frequency when VCC is between 2.5V and 5.5V. At voltages below 2.5V, operation is not specified per the datasheet - unlike the 24AA08/24FC08 variants which support 100 kHz down to 1.7V. This makes the 24LC08B/ST suitable for systems with stable mid-to-high voltage rails but unsuitable for ultra-low-voltage battery operation.
Does the 24LC08B/ST support hardware write protection, and how is it implemented?
Yes, the 24LC08B/ST implements hardware write protection via the WP (Write-Protect) pin. When WP is tied to VCC, all write operations to the entire 8-Kbit memory array (addresses 000h–3FFh) are inhibited; read operations remain fully functional. The WP pin must be driven to a valid logic level - floating is not recommended. This feature is absent in the Chip Scale Package (CSP) variant but fully supported in the SOIC-8 package used for 24LC08B/ST.
What package type is used for the 24LC08B/ST, and are the A0–A2 pins functional?
The 24LC08B/ST is packaged in an 8-Lead Plastic Small Outline (SOIC-N, SN) per Microchip drawing C04-057-SN Rev F. Pins A0, A1, and A2 are not internally connected - they are no-connect (NC) terminals. They may be left floating or tied to VSS/VCC without affecting functionality. This simplifies PCB layout versus EEPROMs requiring address pin configuration.
How many write/erase cycles does the 24LC08B/ST guarantee, and what is its data retention period?
The 24LC08B/ST guarantees a minimum of 1,000,000 write/erase cycles at 25°C and 5.5V, tested in page mode. Its data retention exceeds 200 years under normal operating conditions. These specifications are validated across the industrial temperature range (–40°C to +85°C), making the 24LC08B/ST appropriate for long-lifecycle applications such as industrial automation and medical devices where field reliability is critical.
Can the 24LC08B/ST be used in automotive applications, and what qualifications does it hold?
Yes, the 24LC08B/ST is AEC-Q100 qualified for automotive applications. It meets stress test requirements for temperature cycling, HTOL, and ESD (≥4 kV HBM), and is rated for industrial temperature range (–40°C to +85°C), which covers most passenger cabin and under-hood control modules. While it does not carry the "AEC-Q100 Grade 1" designation reserved for extended-range parts, its qualification supports use in body electronics, lighting controls, and infotainment subsystems where ambient temperatures remain within industrial limits.
24LC08B/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24LC08B/ST FAQ
1.How can I place an order for 24LC08B/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC08B/ST 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 24LC08B/ST reliable?
The price and inventory of 24LC08B/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC08B/ST is usually 5 days.
3.What payment methods are accepted for 24LC08B/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC08B/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC08B/ST?
24LC08B/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC08B/ST 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 24LC08B/ST?
For technical support, including 24LC08B/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC08B/ST requirements.
6.How does Aetrix verify that 24LC08B/ST is sourced from the original manufacturer or authorized distributors?
All 24LC08B/ST 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 24LC08B/ST meets industry standards.
7.What is the process for return or replacement of 24LC08B/ST?
All 24LC08B/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC08B/ST, 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 24LC08B/ST part is unused and in its original packaging.
Return procedure for 24LC08B/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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