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Microchip Technology AT24C08D-PUM
- Part No.:
- AT24C08D-PUM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C08D-PUM.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:893
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Product details
Overview
AT24C08D-PUM from Microchip Technology is an I²C-compatible 8-Kbit serial EEPROM organized as 1,024 × 8 bits, operating from 1.7V to 3.6V across -40°C to +85°C industrial temperature range. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C protocols with hardware write protection via WP pin and ultra-low standby current (0.8 μA max). It is used for configuration storage in embedded controllers, sensor calibration data retention, and boot code parameter backup.
For engineers reviewing the AT24C08D-PUM datasheet, AT24C08D-PUM pinout, AT24C08D-PUM application, or AT24C08D-PUM equivalent, key selection considerations include I²C speed mode compatibility, VCC voltage range alignment with host MCU, WP pin availability in target package, page write timing (≤5 ms), and industrial-grade reliability (1M write cycles, 100-year data retention).
Technical Context
The AT24C08D-PUM operates as a slave device on a two-wire I²C bus, using SCL for clock synchronization and open-drain SDA for bidirectional data transfer with Schmitt-triggered, noise-filtered inputs. It implements hardware address decoding with A2 pin for multi-device bus addressing and internal pull-down logic that defaults A2 to logic '0' if unconnected.
Memory is organized into 64 pages of 16 bytes each, supporting byte-write, partial-page-write, and sequential-read operations. Write protection is controlled by the WP pin: tied to VCC disables all writes; tied to GND enables full-array writes. Power-on reset (POR) ensures command rejection until VCC stabilizes above 1.5 V and tPUP (100 µs) elapses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1,024 × 8 bits), enabling compact nonvolatile storage for firmware flags, calibration coefficients, or device IDs |
| Supply Voltage | 1.7V–3.6V - compatible with 1.8V and 3.3V microcontroller I/O domains without level shifting |
| I²C Speed Modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (FM+) - selectable per system timing budget and noise environment |
| Write Cycle Time | ≤5 ms max - defines minimum interval between successive write commands; enables predictable firmware delay handling |
| Endurance | 1,000,000 write cycles - supports frequent field-updatable parameters in industrial logging or metering applications |
| Data Retention | 100 years at 55°C - guarantees long-term validity of stored configuration without refresh |
| Standby Current | 0.8 μA max at 3.6V - critical for battery-powered IoT nodes requiring multi-year operation |
Pinout & Package
AT24C08D-PUM is supplied in 8-lead PDIP package (plastic dual in-line), with lead-free, RoHS-compliant finish. Pin 1 is NC (no connect); Pin 2 is NC; Pin 3 is A2 (device address input); Pin 4 is GND; Pin 5 is SDA (bidirectional serial data); Pin 6 is SCL (serial clock input); Pin 7 is WP (write-protect input); Pin 8 is VCC (power supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, Pin 2 | No Connect | Unused silicon pads; must remain unconnected - no routing or PCB traces required |
| Pin 3 (A2) | Hardware Address Input | Configures LSB of 7-bit I²C slave address (1010xxx); enables up to two AT24C08D-PUM devices on same bus when hardwired to GND/VCC |
| Pin 4 (GND) | Ground Reference | System ground return path for VCC and I/O; requires low-impedance connection to minimize noise coupling into SDA/SCL |
| Pin 5 (SDA) | Bidirectional Data Line | Open-drain I/O requiring external pull-up resistor (≤10 kΩ); shared across multiple I²C slaves; must not be driven high actively |
| Pin 6 (SCL) | Clock Input | Input-only clock line; also requires external pull-up; timing-critical - rise/fall times ≤100 ns (FM+) must be met |
| Pin 7 (WP) | Write-Protect Control | Active-high hardware lock: tied to VCC blocks all writes; tied to GND enables normal operation; floating defaults to GND via internal pull-down |
| Pin 8 (VCC) | Power Supply | 1.7–3.6V supply input; requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-triggered, filtered I/O | Rejects >100 ns noise spikes on SDA/SCL - eliminates false start/stop detection in electrically noisy industrial environments |
| 16-byte page write mode | Allows partial writes within a 16-byte boundary - reduces write overhead when updating small configuration fields without erasing full page |
| Self-timed internal write cycle | Removes need for external write-complete polling delay - firmware can issue next command after fixed 5 ms wait or use ACK polling |
| ESD protection >4,000 V | Withstands HBM ESD events during board handling and field deployment - reduces risk of latent failure in unshielded enclosures |
| Industrial temperature range | -40°C to +85°C operation - validated for use in automotive under-hood modules, factory automation PLCs, and outdoor metering equipment |
Applications
| Smart Sensor Node | Industrial PLC Module |
|---|---|
Use Scenario: Storing calibrated offset/gain values and unique sensor ID after factory trim. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization via I²C at 400 kHz. Use Value: Eliminates need for external calibration memory; retains accuracy over 100-year lifetime without battery backup. | Use Scenario: Holding user-defined I/O mapping tables and alarm thresholds updated via HMI interface. IC Role / Device Role / Timing Role: Field-programmable parameter store written infrequently but read on every scan cycle via 100 kHz I²C. Use Value: Enables zero-downtime reconfiguration; WP pin prevents accidental overwrite during runtime. |
| Medical Diagnostic Device | Energy Meter Firmware Loader |
Use Scenario: Archiving last-known operational state and error logs before safe shutdown during power loss. IC Role / Device Role / Timing Role: Fast-write-capable shadow memory triggered by brown-out detector interrupt. Use Value: Guarantees recovery integrity with ≤5 ms write completion - meets IEC 62304 Class C data safety requirements. | Use Scenario: Storing encrypted bootloader keys and firmware signature hashes verified before each boot. IC Role / Device Role / Timing Role: Secure boot root-of-trust element accessed only during cold start via isolated I²C bus segment. Use Value: Hardware write-protection (WP = VCC) prevents runtime tampering; 1M endurance supports secure key rotation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C08C-SSHM-T | Same 8-Kbit capacity, identical I²C protocol and pinout; rated for -40°C to +125°C extended temp range; SOIC-8 package | Required where ambient exceeds +85°C (e.g., automotive engine control units) | Select when extended temperature qualification is mandatory; otherwise AT24C08D-PUM offers cost advantage in PDIP form factor |
| M95M01-RDW6TP/K | 8-Mbit SPI EEPROM (not I²C); 2.5–5.5V supply; 10 MHz SPI interface; different pinout and command set | Used where host MCU lacks I²C or requires higher throughput than I²C FM+ allows | Choose only if SPI interface is available and system architecture permits protocol change; not drop-in replaceable |
Compared with AT24C08C-SSHM-T, AT24C08D-PUM trades extended temperature rating for lower cost and PDIP through-hole assembly compatibility; compared with M95M01-RDW6TP/K, it provides pin- and protocol-compatible I²C integration without firmware driver rewrite, albeit at lower maximum bandwidth.
Availability
AT24C08D-PUM is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, smart energy meters, and automotive body electronics requiring stable component supply and long-lifecycle support.
Supply support for AT24C08D-PUM 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 memory solutions, with ISO 9001-certified global manufacturing and design centers.
The AT24C08D-PUM belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, engineered for low-voltage, low-power embedded systems where reliable nonvolatile storage is needed in space-constrained or thermally demanding environments.
FAQ
What is the maximum I²C clock frequency supported by AT24C08D-PUM?
The AT24C08D-PUM supports three I²C speed modes: Standard mode up to 100 kHz (1.7–3.6V), Fast mode up to 400 kHz (1.7–3.6V), and Fast Mode Plus up to 1 MHz (2.5–3.6V). The actual achievable frequency depends on bus capacitance, pull-up resistor value, and signal integrity - for 1 MHz operation, Microchip specifies CL ≤ 100 pF and RPUP ≤ 1.3 kΩ. AT24C08D-PUM must be operated within its specified VCC range for each mode to ensure timing compliance.
Does AT24C08D-PUM require external pull-up resistors on SDA and SCL lines?
Yes, AT24C08D-PUM requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is input-only. Microchip specifies maximum pull-up values of 10 kΩ for Standard mode, 4 kΩ for Fast mode, and 1.3 kΩ for Fast Mode Plus - lower values improve rise time but increase static current. AT24C08D-PUM does not include internal pull-ups; omitting external resistors will prevent I²C communication.
How does the WP (Write-Protect) pin function on AT24C08D-PUM?
The WP pin on AT24C08D-PUM is an active-high hardware write lock: when tied to VCC, all write operations (byte, page, or erase) to the entire memory array are inhibited; when tied to GND, normal write functionality is enabled. If left floating, AT24C08D-PUM's internal strong pull-down defaults WP to GND, permitting writes - however Microchip recommends explicit connection to avoid noise-induced glitches. This feature enables safe field updates while preventing accidental corruption during power transitions.
What is the memory organization of AT24C08D-PUM and how does it affect write operations?
AT24C08D-PUM organizes its 8-Kbit memory as 64 pages of 16 bytes each. This structure enables 16-byte page write mode: up to 16 sequential bytes can be written in a single I²C transaction, provided they reside within the same page boundary. Crossing a page boundary during a page write causes wraparound to the start of the same page. AT24C08D-PUM supports partial page writes, making it efficient for updating small configuration fields without consuming full-page bandwidth.
Is AT24C08D-PUM compatible with standard I²C bus arbitration and multi-master systems?
Yes, AT24C08D-PUM fully complies with the Philips I²C specification for bus arbitration and multi-master operation. It uses standard START/STOP conditions, acknowledges valid addresses with ACK, and releases SDA during the 9th clock cycle to allow master control. Its open-drain outputs and built-in spike filtering ensure robust coexistence with other I²C slaves and masters on the same bus. AT24C08D-PUM does not initiate arbitration but correctly responds to bus contention per I²C protocol rules.
AT24C08D-PUM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 4.5 µs
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C08D-PUM FAQ
1.How can I place an order for AT24C08D-PUM through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C08D-PUM 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 AT24C08D-PUM reliable?
The price and inventory of AT24C08D-PUM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C08D-PUM is usually 5 days.
3.What payment methods are accepted for AT24C08D-PUM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C08D-PUM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C08D-PUM?
AT24C08D-PUM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C08D-PUM 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 AT24C08D-PUM?
For technical support, including AT24C08D-PUM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C08D-PUM requirements.
6.How does Aetrix verify that AT24C08D-PUM is sourced from the original manufacturer or authorized distributors?
All AT24C08D-PUM 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 AT24C08D-PUM meets industry standards.
7.What is the process for return or replacement of AT24C08D-PUM?
All AT24C08D-PUM units undergo pre-shipment inspection (PSI). If there is an issue with AT24C08D-PUM, 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 AT24C08D-PUM part is unused and in its original packaging.
Return procedure for AT24C08D-PUM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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