My Inquiry
My Account
Microchip Technology AT24C256-10PI
- Part No.:
- AT24C256-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C256-10PI.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,223
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT24C256-10PI from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) I²C-compatible serial EEPROM with industrial temperature range (–40°C to +85°C), 2.7V to 5.5V supply operation, 64-byte page write capability, and hardware write protection via the WP pin. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT24C256-10PI datasheet, AT24C256-10PI pinout, AT24C256-10PI application, or AT24C256-10PI equivalent, key selection criteria include its 400 kHz I²C speed at 2.7V, 10 ms max write cycle time, 100,000 write endurance, 40-year data retention, and compatibility with 8-pin PDIP (8P3) packaging for through-hole industrial designs.
Technical Context
The AT24C256-10PI implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting standard-mode (100 kHz), fast-mode (400 kHz), and high-speed mode (1 MHz at 5V) timing. Its internal address counter enables sequential reads across pages without readdressing.
It uses a cascaded device addressing scheme with A0 and A1 pins, allowing up to four AT24C256-10PI devices on a shared bus. The WP pin provides hardware-level write inhibition when tied to VCC, while floating or grounded states enable full or selective write access respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), organized as 512 pages of 64 bytes - enables efficient firmware parameter storage with minimal address overhead |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3.3V and 5V systems without level-shifting |
| I²C Clock Frequency | Up to 400 kHz at 2.7V - ensures reliable communication in noise-prone industrial environments |
| Write Cycle Time | Max 10 ms - defines minimum interval between write commands; impacts real-time logging latency |
| Endurance | 100,000 write cycles - guarantees long-term reliability in field-updatable calibration or event-logging applications |
| Data Retention | 40 years at +85°C - meets extended service life requirements for infrastructure and automotive control modules |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in programmable logic controllers and motor drives |
Pinout & Package
AT24C256-10PI is packaged in an 8-pin Plastic Dual Inline Package (PDIP), per JEDEC MS-001 BA standard (package code 8P3), with 0.300" body width and through-hole mounting. Pin 1 is marked by a notch or dot.
| 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 low |
| A1 | Device Address Input | Second address bit; used with A0 to uniquely identify up to four devices on same I²C bus |
| NC | No Connect | Internally unconnected; must remain unconnected on PCB - no pull-up/down or routing |
| GND | Ground Reference | System return path for VCC and I/O; requires low-impedance connection to minimize noise coupling |
| VCC | Power Supply | Primary supply input (2.7–5.5V); bypass capacitor (0.1 µF ceramic) required within 1 cm of pin |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; grounded or floating enables normal operation |
| SCL | I²C Clock Input | Open-drain compatible clock line; requires external pull-up resistor (typically 2.2–10 kΩ to VCC) |
| SDA | I²C Data I/O | Bidirectional open-drain data line; shares pull-up with SCL or uses separate resistor depending on bus loading |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode | 64-byte burst writes reduce I²C transaction count by up to 64× versus byte writes - critical for fast firmware update staging |
| Schmitt Trigger Inputs | Hysteresis on SDA/SCL suppresses noise-induced glitches in electrically noisy industrial cabinets or motor drive enclosures |
| Hardware Write Protection | WP pin enables fail-safe locking of critical configuration data during system boot or fault recovery sequences |
| Address Cascading | A0/A1 pins support up to four AT24C256-10PI devices on one I²C bus - simplifies multi-module system design without address conflicts |
| Low Standby Current | 6.0 µA max at 5V - minimizes quiescent power in battery-backed or energy-harvesting edge nodes |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during startup and runtime reconfiguration. Use Value: Enables field updates without firmware reflashing; 40-year retention ensures parameter integrity across equipment lifecycle. | Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation curves for MEMS accelerometers and pressure sensors. IC Role / Device Role / Timing Role: Calibration data repository read once at power-on and cached in MCU RAM for real-time correction. Use Value: Eliminates need for external trimming components; 100,000-cycle endurance supports recalibration during maintenance cycles. |
| Power Supply Sequencing Log | Medical Device Usage Audit Trail |
Use Scenario: Recording timestamped voltage/fault events and sequencing state transitions in redundant AC/DC power supplies for telecom infrastructure. IC Role / Device Role / Timing Role: Event logger with atomic page writes ensuring crash-safe record commits during brownout conditions. Use Value: 10 ms max write time allows logging of >100 events per second; WP pin prevents accidental overwrite during diagnostics. | Use Scenario: Maintaining tamper-evident usage logs (power-on count, self-test results, firmware version) in portable diagnostic ultrasound units. IC Role / Device Role / Timing Role: Secure audit memory with hardware write lock activated after final production test. Use Value: Meets IEC 62304 traceability requirements; 2.7–5.5V operation supports both Li-ion and USB-powered variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256-10PU | Same die, but in 8-pin SOIC (8S1) package - 0.150" width, surface-mount, RoHS-compliant lead finish | Preferred for automated SMT assembly; unsuitable for hand-soldered prototyping or legacy through-hole layouts | Select AT24C256-10PU when board space is constrained and reflow capability exists. |
| BR24G256FJ-WE2 | Rohm 256 Kbit I²C EEPROM; 1.7–5.5V supply, 1 MHz max clock, 5 ms typical write time, 1 million write cycles | Higher endurance and faster write speed, but different A0/A1 addressing behavior and no NC pin - requires layout and firmware review | Choose BR24G256FJ-WE2 only if extended write lifetime or higher throughput justifies redesign effort. |
Compared with AT24C256-10PU, the AT24C256-10PI offers identical electrical performance and pinout but in a through-hole PDIP package for manual assembly and thermal cycling robustness; versus BR24G256FJ-WE2, it trades higher endurance for proven industrial qualification and simpler address pin handling.
Availability
AT24C256-10PI is available at Aetrix Electronics and suitable for industrial PLCs, smart sensor modules, power supply sequencers, and medical audit loggers requiring stable component supply across extended product lifecycles.
Supply support for AT24C256-10PI 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 acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the AT24Cxx family.
The AT24C256-10PI belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile data storage in industrial, automotive, and medical systems where long-term data integrity and wide-voltage interoperability are mandatory.
FAQ
What is the maximum I²C clock frequency supported by the AT24C256-10PI?
The AT24C256-10PI supports up to 400 kHz at 2.7V–5.5V supply, and up to 1 MHz when operated at 5.0V (4.5V–5.5V). Its AC characteristics are fully characterized across the industrial temperature range (–40°C to +85°C), making the 400 kHz rating the guaranteed maximum for stable operation under worst-case voltage and temperature conditions. The AT24C256-10PI datasheet specifies tLOW and tHIGH timing limits that must be met by the master controller.
Does the AT24C256-10PI require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C256-10PI requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ to VCC, selected based on bus capacitance and desired rise time. The AT24C256-10PI's input hysteresis and noise filtering help maintain signal integrity even with longer traces, but proper pull-up sizing remains essential for reliable communication.
How does the WP pin function on the AT24C256-10PI?
The WP (Write Protect) pin on the AT24C256-10PI is an active-high hardware lock: when tied to VCC, all write operations (byte and page) are inhibited, preserving memory contents. When grounded or left floating (internally pulled down), full write capability is enabled. This feature allows safe configuration storage in systems where accidental overwrites must be prevented during power-up or fault recovery - a key safety mechanism implemented directly in the AT24C256-10PI silicon.
Can multiple AT24C256-10PI devices share the same I²C bus?
Yes, up to four AT24C256-10PI devices can share a single I²C bus using hardware address selection via the A0 and A1 pins. Each device responds to a unique 7-bit slave address (0x50–0x53) determined by the logic levels on those pins. The AT24C256-10PI's address decoding is fully compliant with I²C specification and requires no software configuration - enabling scalable memory expansion without address conflicts.
What is the write endurance and data retention specification for the AT24C256-10PI?
The AT24C256-10PI is rated for 100,000 write cycles per memory location and guarantees 40 years of data retention at +85°C ambient temperature. These specifications are validated per JEDEC standards and apply across the full industrial operating range. The AT24C256-10PI achieves this reliability through oxide quality control and charge-trapping design, making it suitable for applications requiring infrequent but mission-critical updates, such as calibration data or security keys.
AT24C256-10PI 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:
- 256Kbit
- Memory Organization:
- 32K 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
AT24C256-10PI FAQ
1.How can I place an order for AT24C256-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256-10PI 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 AT24C256-10PI reliable?
The price and inventory of AT24C256-10PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C256-10PI is usually 5 days.
3.What payment methods are accepted for AT24C256-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256-10PI?
AT24C256-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256-10PI 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 AT24C256-10PI?
For technical support, including AT24C256-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256-10PI requirements.
6.How does Aetrix verify that AT24C256-10PI is sourced from the original manufacturer or authorized distributors?
All AT24C256-10PI 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 AT24C256-10PI meets industry standards.
7.What is the process for return or replacement of AT24C256-10PI?
All AT24C256-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256-10PI, 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 AT24C256-10PI part is unused and in its original packaging.
Return procedure for AT24C256-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT24C256-10PI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
