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Microchip Technology AT24C128-10PI
- Part No.:
- AT24C128-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C128-10PI.pdf
- Description:
- IC EEPROM 128KBIT I2C 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,971
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Product details
Overview
AT24C128-10PI from Microchip Technology (formerly Atmel) is a 128K-bit (16,384 × 8) I²C-compatible serial EEPROM with 2.7V to 5.5V operation, 400 kHz maximum clock frequency, and industrial temperature range (–40°C to +85°C). It features hardware write protection via the WP pin, 64-byte page write capability, and 100,000 write cycles endurance - deployed in embedded control modules requiring nonvolatile parameter storage under variable supply conditions.
For engineers reviewing the AT24C128-10PI datasheet, AT24C128-10PI pinout, AT24C128-10PI application, or AT24C128-10PI equivalent, key selection criteria include its industrial-grade temperature rating, 2.7V–5.5V supply compatibility, 400 kHz I²C speed at 2.7V, WP-enabled data security, and JEDEC PDIP-8 package footprint for legacy board compatibility.
Technical Context
The AT24C128-10PI implements a standard two-wire (I²C) interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal address counter supports current-address, random-address, and sequential read modes, while page-write logic enables burst writes up to 64 bytes within a single memory page boundary.
Device addressing uses A0 and A1 pins to support up to four devices on one bus; unconnected pins default low via internal biasing. Write protection is enforced by tying WP high to VCC, disabling all write operations without software intervention - a hardware-level safeguard independent of firmware state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 128 Kbit (16,384 × 8), organized as 256 pages × 64 bytes - enables efficient parameter logging and configuration storage in space-constrained systems. |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into mixed-voltage industrial boards without level-shifting. |
| I²C Clock Frequency | Up to 400 kHz at 2.7V - ensures reliable communication with microcontrollers operating at reduced supply voltages. |
| Write Cycle Time | Max 10 ms - defines minimum interval between write commands; impacts firmware timeout design and data logging latency. |
| Endurance | 100,000 write cycles - guarantees long-term reliability for frequently updated calibration or runtime configuration data. |
| Data Retention | 40 years at +85°C - ensures persistent storage integrity across product lifetime in harsh thermal environments. |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, metering, and automotive body electronics applications. |
Pinout & Package
AT24C128-10PI is packaged in an 8-pin JEDEC PDIP (Plastic Dual Inline Package), 0.300" wide (8P3), with through-hole mounting compatibility and industry-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to select one of four possible I²C addresses (0x50–0x53); floating defaults to logic 0. |
| A1 | Device Address Input | Second address bit; used with A0 to enable multi-device bus sharing without address conflict. |
| NC | No Connect | Internally unused pin; must remain unconnected per datasheet - no pull-up/down or routing required. |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance connection to system ground plane. |
| VCC | Power Supply | Accepts 2.7V–5.5V; decoupling capacitor (0.1 µF ceramic) recommended within 10 mm of pin. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND or left floating enables full read/write access. |
| SCL | I²C Clock Input | Schmitt-triggered input accepting 0–VCC logic levels; requires external pull-up resistor (typically 2.2–10 kΩ). |
| SDA | I²C Data I/O | Open-drain bidirectional line; shares bus with other I²C devices; requires same external pull-up as SCL. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Write Protection | WP pin provides fail-safe, firmware-independent memory locking - critical for preventing accidental overwrites during power transitions or reset sequences. |
| Page Write Mode | 64-byte burst writes reduce I²C transaction overhead by >90% vs. byte-by-byte writes - accelerates firmware updates and bulk configuration saves. |
| Schmitt Trigger Inputs | Enhanced noise immunity on SCL/SDA lines allows reliable operation in electrically noisy industrial enclosures without additional filtering components. |
| Industrial Temperature Rating | –40°C to +85°C operation validated per JEDEC JESD22-A108 - eliminates derating concerns in uncontrolled ambient deployments. |
| Low Standby Current | 6.0 µA max at 5V - minimizes quiescent power draw in battery-backed or energy-harvesting systems during idle periods. |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Storing calibrated sensor offsets, channel gain settings, and firmware revision metadata across power cycles in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during boot and runtime reconfiguration. Use Value: Enables field-upgradable calibration without hardware modification; retains settings through brown-out events and extended maintenance outages. | Use Scenario: Recording tariff schedules, tamper-event timestamps, and metrology calibration constants in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected parameter store synchronized with real-time clock and metrology ASIC registers. Use Value: WP pin prevents unauthorized firmware or billing parameter changes; 40-year retention meets utility-grade 20+ year deployment requirements. |
| Automotive Body Control Unit | Medical Diagnostic Equipment |
Use Scenario: Saving user preferences (mirror position, seat memory), fault logs, and adaptive learning values in 12V vehicle subsystems with wide input voltage transients. IC Role / Device Role / Timing Role: Robust configuration EEPROM interfaced to 8-bit/16-bit MCU via I²C, tolerant of load-dump and cold-crank conditions. Use Value: 2.7V–5.5V operation survives cranking dips; industrial temp rating covers under-hood thermal extremes without derating. | Use Scenario: Storing device-specific calibration coefficients, regulatory compliance flags, and service history in FDA-cleared portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Trusted configuration vault accessed only during boot and authorized service mode - isolated from main application processor. Use Value: Hardware WP ensures calibration integrity cannot be compromised by software faults or malware; 100K-cycle endurance supports frequent recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C128-10PU | Same electrical specs and pinout, but in 8-lead SOIC (8S1) package - 5.0 mm × 6.2 mm surface-mount footprint. | Requires PCB redesign for SMT assembly; unsuitable for through-hole prototyping or legacy PDIP layouts. | Select when automated SMT production, smaller board area, or thermal performance outweighs through-hole compatibility. |
| BR24G128FJ-10 | Rohm's 128K I²C EEPROM with identical 2.7–5.5V range and 400 kHz speed, but rated –40°C to +105°C and includes built-in write-cycle arbitration. | Better suited for under-hood automotive or high-ambient industrial enclosures exceeding +85°C. | Choose for extended temperature margin or enhanced multi-master bus robustness where AT24C128-10PI's 85°C limit is insufficient. |
Compared with AT24C128-10PU and BR24G128FJ-10, the AT24C128-10PI uniquely combines industrial temperature qualification, PDIP-8 through-hole packaging, and proven field reliability in legacy infrastructure - making it optimal for repair, retrofit, and cost-sensitive industrial designs where layout change is prohibitive.
Availability
AT24C128-10PI is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended product lifecycles.
Supply support for AT24C128-10PI 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 nonvolatile memory solutions, with broad industrial and automotive qualification portfolios.
The AT24C128 series was designed specifically for robust, low-power serial configuration storage in industrial control, metering, and automotive subsystems - emphasizing hardware write protection, wide voltage operation, and long-term data integrity.
FAQ
What is the maximum I²C clock frequency supported by the AT24C128-10PI?
The AT24C128-10PI supports up to 400 kHz I²C clock frequency when operated at 2.7V–5.5V supply. This is confirmed in the AC Characteristics table for the "2.7V" option, where fSCL Max = 400 kHz. The device does not support 1 MHz operation unless powered at 5.0V (which the -10PI variant is not rated for - only -10CC/-10PC variants are 5V-only). Thus, 400 kHz is the guaranteed maximum for AT24C128-10PI.
Does the AT24C128-10PI require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C128-10PI requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a Schmitt-trigger input without internal pull-ups. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; 4.7 kΩ is commonly used for 400 kHz operation with ≤400 pF total bus capacitance. The AT24C128-10PI itself does not provide internal pull-ups.
Can the AT24C128-10PI be used in a 1.8V system?
No, the AT24C128-10PI is not rated for 1.8V operation. Its specified supply range is 2.7V to 5.5V, as indicated in the Ordering Information table (row "AT24C128-10PI-2.7") and DC Characteristics (VCC2 min = 2.5V, but operational guarantee starts at 2.7V). For 1.8V systems, Microchip offers the AT24C128-10PI-1.8 variant - a different ordering code with distinct internal design and qualification.
How many AT24C128-10PI devices can share the same I²C bus?
Up to four AT24C128-10PI devices can share a single I²C bus using hardware address selection via the A0 and A1 pins. Each combination of A0/A1 (00, 01, 10, 11) yields a unique 7-bit device address (0x50–0x53). Floating A0/A1 defaults to '0', so explicit hardwiring is required to use multiple devices without address collision. The AT24C128-10PI itself does not auto-detect or arbitrate addresses.
What happens to the AT24C128-10PI's memory contents during a power loss?
The AT24C128-10PI retains all stored data during power loss due to its nonvolatile EEPROM architecture. Data retention is specified at 40 years at +85°C and exceeds 200 years at room temperature. A valid write cycle must complete before power removal - if interrupted mid-write, the affected byte/page may contain undefined data, but adjacent memory remains intact. No backup power or capacitor is needed for data preservation.
AT24C128-10PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 128Kbit
- Memory Organization:
- 16K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C128-10PI FAQ
1.How can I place an order for AT24C128-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C128-10PI 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 AT24C128-10PI reliable?
The price and inventory of AT24C128-10PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C128-10PI is usually 5 days.
3.What payment methods are accepted for AT24C128-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C128-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C128-10PI?
AT24C128-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C128-10PI 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 AT24C128-10PI?
For technical support, including AT24C128-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C128-10PI requirements.
6.How does Aetrix verify that AT24C128-10PI is sourced from the original manufacturer or authorized distributors?
All AT24C128-10PI 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 AT24C128-10PI meets industry standards.
7.What is the process for return or replacement of AT24C128-10PI?
All AT24C128-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT24C128-10PI, 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 AT24C128-10PI part is unused and in its original packaging.
Return procedure for AT24C128-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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