My Inquiry
My Account
Microchip Technology AT24C256W-10SI-1.8
- Part No.:
- AT24C256W-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C256W-10SI-1.8.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,484
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT24C256W-10SI-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) I²C-compatible serial EEPROM optimized for low-power, 1.8 V operation. It supports 100 kHz I²C bus speed at 1.8 V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 40-year data retention. It is used in embedded systems requiring nonvolatile parameter storage under constrained voltage and space budgets - such as smart meters, IoT sensor nodes, and portable medical devices.
For engineers reviewing the AT24C256W-10SI-1.8 datasheet, AT24C256W-10SI-1.8 pinout, AT24C256W-10SI-1.8 application, or AT24C256W-10SI-1.8 equivalent, this page provides verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts for industrial-grade 1.8 V EEPROM selection.
Technical Context
The AT24C256W-10SI-1.8 implements a standard two-wire (I²C) interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It uses open-drain bidirectional data transfer with internal pull-down biasing on floating A0/A1 and WP pins when capacitive coupling to VCC is below 3 pF.
Memory is organized into 512 pages of 64 bytes each, supporting both byte and partial/complete page writes. Write cycle time is 5 ms maximum (process "B" variant), and addressability requires a 15-bit word address with cascading support for up to four devices on one bus using A1/A0 hardware addressing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), enabling storage of firmware calibration data or device configuration tables. |
| Supply Voltage Range | 1.8 V to 3.6 V - compatible with modern ultra-low-voltage microcontrollers and battery-powered designs. |
| I²C Clock Frequency | 100 kHz max at 1.8 V - ensures reliable communication in noise-sensitive, low-power environments. |
| Write Endurance | 1,000,000 cycles (process "B") - supports frequent logging or runtime parameter updates over product lifetime. |
| Data Retention | 40 years at +25°C - guarantees long-term integrity of stored calibration, serial numbers, or security keys. |
| Standby Current | 0.2 µA at 1.8 V - minimizes quiescent power draw in always-on edge devices. |
| Page Write Capacity | 64-byte page write mode - reduces write transaction overhead and improves efficiency vs. byte-by-byte writes. |
Pinout & Package
AT24C256W-10SI-1.8 is packaged in an 8-lead JEDEC SOIC (8S1), 3.9 mm × 4.9 mm body, gull-wing lead form with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high or left floating (internally pulled down); selects 1 of 4 possible I²C addresses on shared bus. |
| A1 | Device Address Input | Same function as A0; combined with A0 enables up to four AT24C256W-10SI-1.8 devices on one I²C bus. |
| NC | No Connect | Unbonded pin; must remain unconnected per design - no routing or termination required. |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance connection to system ground plane. |
| VCC | Power Supply Input | Accepts 1.8 V to 3.6 V; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin. |
| WP | Hardware Write Protect | Pulled high to VCC to disable all writes; pulled low or floating (internally pulled down) to enable write operations. |
| SCL | Serial Clock Input | Positive-edge clock for data-in; negative-edge clock for data-out; requires external pull-up resistor (typically 10 kΩ). |
| SDA | Serial Data I/O | Bidirectional open-drain line; shares bus with other I²C devices; requires same external pull-up as SCL. |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V Operation | Full functionality from 1.8 V to 3.6 V - eliminates level-shifting in 1.8 V SoC-based designs. |
| Schmitt Trigger Inputs | On SDA/SCL pins - rejects fast transient noise and ensures robust timing margin in electrically noisy PCB layouts. |
| Write Protect Pin (WP) | Hardware-enforced memory lock - prevents accidental or malicious overwrites during power-up or firmware update sequences. |
| 64-byte Page Write | Reduces I²C transaction count by up to 64× vs. byte writes - lowers bus occupancy and host CPU overhead. |
| Extended Temp Support | Rated for -40°C to +85°C industrial range - suitable for deployment in outdoor, automotive, or factory-floor environments. |
Applications
| Smart Energy Metering | Industrial PLC Configuration |
|---|---|
|
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs in utility-grade electricity meters. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 40-year retention and 1M write endurance under daily update cycles. Use Value: Eliminates need for external backup batteries or supercapacitors while maintaining regulatory compliance for data integrity. |
Use Scenario: Holding I/O mapping tables, PID tuning parameters, and firmware revision history in programmable logic controllers. IC Role / Device Role / Timing Role: I²C-configurable memory accessed during boot and runtime by ARM Cortex-M7 host MCU. Use Value: Enables field-upgradable control logic without reprogramming flash or replacing hardware. |
| Portable Medical Sensors | Automotive Body Control Modules |
|
Use Scenario: Saving patient-specific calibration offsets and usage counters in handheld ECG or glucose monitors. IC Role / Device Role / Timing Role: Low-quiescent-current (0.2 µA) EEPROM interfaced directly to 1.8 V ADC/MCU subsystem. Use Value: Extends single-cell coin-cell battery life beyond 5 years while preserving critical diagnostic traceability data. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Cascaded I²C slave (A0/A1 configured) sharing bus with CAN transceivers and LIN drivers. Use Value: Supports OEM personalization features without increasing BOM count or PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M24C256-WMN6TP | Same 256 Kbit density and 1.8–5.5 V range, but rated only to 85°C (not extended temp); uses different package marking and tape/reel format. | Lacks extended temperature qualification - unsuitable for under-hood or high-ambient industrial deployments. | Select when cost sensitivity outweighs extended temp requirement and board layout allows SOIC-8 footprint compatibility. |
| BR24G256FJ-WE2 | 1.7–5.5 V supply, 400 kHz I²C at 1.8 V, 1 M write cycles, but uses 8-pin TSSOP (8A2) instead of SOIC (8S1); different pinout (VCC/WP/SCL/SDA order differs). | Requires PCB redesign due to non-identical pin mapping and smaller 3.0 × 4.4 mm TSSOP body. | Choose for space-constrained designs where TSSOP footprint is already allocated and higher-speed 400 kHz operation at 1.8 V is needed. |
Compared with M24C256-WMN6TP and BR24G256FJ-WE2, the AT24C256W-10SI-1.8 offers verified industrial temperature support (-40°C to +85°C) in JEDEC SOIC-8, making it optimal for drop-in replacement in legacy 1.8 V systems where thermal reliability and package compatibility are mandatory.
Availability
AT24C256W-10SI-1.8 is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC configuration, and portable medical sensors requiring stable component supply across long production lifecycles.
Supply support for AT24C256W-10SI-1.8 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 continuity, quality assurance, and long-term supply commitment for the AT24Cxx EEPROM family.
The AT24C256W-10SI-1.8 belongs to Microchip's serial EEPROM product line, engineered specifically for robust, low-voltage nonvolatile storage in space- and power-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C256W-10SI-1.8 at 1.8 V?
The AT24C256W-10SI-1.8 supports up to 100 kHz I²C clock frequency when operating at 1.8 V. This is explicitly specified in the AC Characteristics table for the 1.8-volt column and reflects its optimization for ultra-low-voltage reliability rather than speed. Higher frequencies (400 kHz/1 MHz) require ≥2.5 V supply.
Does AT24C256W-10SI-1.8 support hardware write protection?
Yes, AT24C256W-10SI-1.8 includes a dedicated Write Protect (WP) pin. When tied to VCC, all write operations - including byte, page, and erase - are inhibited. When grounded or left floating (internally pulled down), writes are enabled. This provides deterministic, circuit-level data security independent of software state.
What package type is used for AT24C256W-10SI-1.8?
AT24C256W-10SI-1.8 uses an 8-lead JEDEC SOIC package (designated 8S1), measuring 3.9 mm × 4.9 mm with gull-wing leads and 1.27 mm pitch. This is confirmed in the AT24C256 Ordering Information table and matches the pin configuration diagrams for SOIC variants.
How many devices can share the same I²C bus with AT24C256W-10SI-1.8?
Up to four AT24C256W-10SI-1.8 devices can share a single I²C bus using hardware address lines A0 and A1. Each device's 7-bit I²C address is formed by the fixed prefix '1010' plus the two user-configurable bits from A1/A0, yielding addresses 0x50–0x53.
Is AT24C256W-10SI-1.8 qualified for extended temperature operation?
No - AT24C256W-10SI-1.8 is specified for the industrial temperature range of -40°C to +85°C. Extended temperature (-40°C to +125°C) qualification applies only to variants marked with '-10SE-2.7' (e.g., AT24C256N-10SE-2.7), not the '-10SI-1.8' suffix used in AT24C256W-10SI-1.8.
AT24C256W-10SI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.8V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C256W-10SI-1.8 FAQ
1.How can I place an order for AT24C256W-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256W-10SI-1.8 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 AT24C256W-10SI-1.8 reliable?
The price and inventory of AT24C256W-10SI-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C256W-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C256W-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256W-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256W-10SI-1.8?
AT24C256W-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256W-10SI-1.8 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 AT24C256W-10SI-1.8?
For technical support, including AT24C256W-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256W-10SI-1.8 requirements.
6.How does Aetrix verify that AT24C256W-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C256W-10SI-1.8 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 AT24C256W-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C256W-10SI-1.8?
All AT24C256W-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256W-10SI-1.8, 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 AT24C256W-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT24C256W-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT24C256W-10SI-1.8 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…
