My Inquiry
My Account
Microchip Technology AT25256-10PC-1.8
- Part No.:
- AT25256-10PC-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25256-10PC-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT25256-10PC-1.8 from Microchip Technology (formerly Atmel) is a 256K-bit (32,768 × 8) serial SPI EEPROM optimized for low-voltage embedded systems. It operates from 1.8V to 3.6V, supports 3 MHz clock rate, features 64-byte page write, hardware/software write protection via WP/HOLD pins, and delivers 100,000 write cycles with >200-year data retention - used in industrial sensor nodes and battery-powered IoT edge devices.
For engineers reviewing the AT25256-10PC-1.8 datasheet, AT25256-10PC-1.8 pinout, AT25256-10PC-1.8 application, or AT25256-10PC-1.8 equivalent, key selection criteria include 1.8V operation margin, SOIC-8 package compatibility, SPI Mode 0/3 timing compliance, block-level write protection granularity, and endurance under extended temperature cycling.
Technical Context
The AT25256-10PC-1.8 implements a synchronous SPI slave interface with separate SI/SO lines, MSB-first data framing, and CS-driven command initiation. Its status register controls BP0/BP1 for 1/4, 1/2, or full-array write protection and includes WPEN to enable/disable hardware write protection via the WP pin.
Internal self-timed write cycles (5 ms typical) eliminate external timing management; HOLD suspends ongoing transfers without resetting sequence state; and RDSR/WRSR instructions provide real-time readiness monitoring and nonvolatile configuration of protection settings - all compliant with standard SPI protocol semantics for microcontroller coexistence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), directly addressable as byte-wide storage with auto-incremented sequential reads |
| Supply Voltage Range | 1.8V to 3.6V - enables direct interfacing with 1.8V I/O domains without level-shifting |
| Max Clock Frequency | 3 MHz at 1.8V - sets maximum sustained throughput of ~300 kB/s in page-write mode |
| Write Cycle Time | 5 ms typical - defines minimum interval between write commands and impacts firmware polling overhead |
| Endurance | 100,000 write cycles - determines usable lifetime in logging or configuration update applications |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unpowered archival storage |
| ESD Protection | >4000V HBM - provides robustness against handling and board-level electrostatic discharge events |
Pinout & Package
AT25256-10PC-1.8 uses an 8-pin EIAJ SOIC (0.200" wide) package with standard gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a notch or dot; device orientation follows JEDEC MO-002AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable signal; must be held low for entire instruction cycle including address/data transfer |
| SCK | Serial Clock Input | Synchronous edge-triggered clock; supports SPI Modes 0 and 3 only; max 3 MHz at 1.8V |
| SI | Serial Data Input | MSB-first command/address/data input path; sampled on SCK rising edge in Mode 0 |
| SO | Serial Data Output | Tri-state open-drain output; driven high/low during read; high-Z when CS high or HOLD active |
| WP | Write Protect Input | Hardware lock for status register writes when WPEN=1; no effect if WPEN=0 |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting internal state; requires SCK low before assertion |
| GND | Ground Reference | Primary return path for VCC current and logic reference; must be low-impedance connection |
| VCC | Power Supply | 1.8V–3.6V supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| 1.8V Operation Support | Enables direct integration into ultra-low-power MCU subsystems without voltage translation circuitry |
| 64-Byte Page Write Mode | Reduces firmware overhead by allowing burst programming of aligned 64-byte blocks instead of single-byte writes |
| Configurable Block Protection | BP0/BP1 bits allow selective locking of top 1/4, top 1/2, or entire memory array via WRSR instruction |
| Hardware + Software Write Protection | WP pin and WRDI/WREN instructions provide layered defense against accidental or malicious overwrites |
| Industrial Temperature Range | -40°C to +85°C operation - validated for deployment in harsh environmental conditions |
Applications
| Smart Metering Module | Medical Diagnostic Sensor |
|---|---|
Use Scenario: Storing calibration coefficients, usage logs, and firmware update metadata in utility-grade electricity meters deployed outdoors. IC Role / Device Role / Timing Role: Nonvolatile configuration and event logging storage with guaranteed data integrity across power cycles and temperature extremes. Use Value: 100,000 write cycles and >200-year retention ensure decade-long field reliability without replacement; 1.8V operation reduces system power budget. | Use Scenario: Recording patient vital sign history and device self-test results in portable ECG monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-energy persistent storage for time-stamped clinical data, supporting FDA-compliant audit trails. Use Value: 1.8V compatibility eliminates need for boost converters; HOLD pin allows safe interruption during critical measurement windows. |
| Automotive Body Control Unit | Industrial PLC I/O Module |
Use Scenario: Saving seat/mirror position presets and lighting profiles in 12V vehicle architectures with local 3.3V/1.8V regulation. IC Role / Device Role / Timing Role: Parameter storage for user-customizable functions requiring immunity to brown-out and ESD events. Use Value: >4000V HBM rating withstands automotive harness coupling transients; WP pin prevents corruption during CAN bus noise bursts. | Use Scenario: Holding module identification, calibration offsets, and diagnostic fault history in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Field-updatable configuration store accessible via SPI master running RTOS tasks. Use Value: Block protection prevents accidental overwrite of factory-set parameters while permitting runtime logging to unprotected sectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DWDW3TP/K | 256 Kbit SPI EEPROM, 1.8V–5.5V range, 20 MHz max clock, SO8 package, 1M write cycles | Higher speed and endurance; lacks HOLD pin; different status register layout | Select when higher throughput or longer lifetime is required and HOLD functionality is unused |
| BR25G256FJ-3GE2 | 256 Kbit SPI EEPROM, 1.6V–5.5V, 10 MHz max clock, 8-pin TSSOP, 4M write cycles, built-in error correction | Wider voltage range, higher endurance, ECC support; different pinout (TSSOP vs SOIC) | Choose for mission-critical data integrity where bit errors must be detected/corrected automatically |
Compared with M95256-DWDW3TP/K and BR25G256FJ-3GE2, AT25256-10PC-1.8 offers proven HOLD functionality and deterministic 5 ms write timing ideal for resource-constrained microcontrollers, while trading off raw speed and endurance for cost-effective SOIC-8 manufacturability and legacy design compatibility.
Availability
AT25256-10PC-1.8 is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostics equipment, automotive body control modules, and programmable logic controller I/O modules requiring stable component supply across extended product lifecycles.
Supply support for AT25256-10PC-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 technical and manufacturing continuity for the AT25xxx EEPROM family.
The AT25xxx series was designed specifically for reliable, low-voltage serial data storage in space-constrained embedded systems where SPI interface simplicity and long-term data integrity are prioritized over raw speed.
FAQ
What is the operating voltage range specified for AT25256-10PC-1.8?
The AT25256-10PC-1.8 is rated for 1.8V to 3.6V operation, making it compatible with modern low-power microcontrollers and SoCs that lack 3.3V or 5V I/O rails. This range is explicitly defined in the DC Characteristics table of the datasheet and validated across the full industrial temperature range (-40°C to +85°C). Operation outside this window may result in undefined behavior or reduced reliability.
Does AT25256-10PC-1.8 support SPI Mode 0 and Mode 3 only?
Yes, AT25256-10PC-1.8 supports SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1) exclusively. The device's timing diagrams and AC specifications confirm valid setup/hold relationships only for these two modes. Attempting Mode 1 or Mode 2 will violate tSU/tH requirements and cause communication failure. This limitation is inherent to the internal clock-sampling architecture.
How does the HOLD pin function during an active SPI transaction on AT25256-10PC-1.8?
The HOLD pin on AT25256-10PC-1.8 suspends serial communication without resetting the internal state - for example, during a multi-byte READ or WRITE sequence. To activate HOLD, the pin must be driven low while SCK is low; resumption occurs when HOLD returns high while SCK remains low. During suspension, SO enters high-impedance and SI is ignored, preserving address and data pointer positions for seamless continuation.
What memory protection options are available on AT25256-10PC-1.8?
AT25256-10PC-1.8 provides three levels of block write protection via BP0/BP1 bits in its status register: none, top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or full array (0000–7FFFh). Protection is enforced during WRITE and WRSR operations. WP pin hardware lock and WRDI software disable add further layers - all configurable without external components.
Is AT25256-10PC-1.8 pin-compatible with other variants in the AT25xxx family?
AT25256-10PC-1.8 shares identical 8-pin SOIC (EIAJ) pinout and signal mapping with AT25128-10PC-1.8 and all -PC suffix variants, enabling direct PCB footprint reuse across 128K/256K densities. However, it is not pin-compatible with -SC (SOIC JEDEC), -TC (TSSOP), or -CC (LAP) packages due to differing pin assignments and physical dimensions - always verify package code before substitution.
AT25256-10PC-1.8 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:
- SPI
- Clock Frequency:
- 2.1 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25256-10PC-1.8 FAQ
1.How can I place an order for AT25256-10PC-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256-10PC-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 AT25256-10PC-1.8 reliable?
The price and inventory of AT25256-10PC-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 AT25256-10PC-1.8 is usually 5 days.
3.What payment methods are accepted for AT25256-10PC-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256-10PC-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256-10PC-1.8?
AT25256-10PC-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256-10PC-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 AT25256-10PC-1.8?
For technical support, including AT25256-10PC-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256-10PC-1.8 requirements.
6.How does Aetrix verify that AT25256-10PC-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25256-10PC-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 AT25256-10PC-1.8 meets industry standards.
7.What is the process for return or replacement of AT25256-10PC-1.8?
All AT25256-10PC-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256-10PC-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 AT25256-10PC-1.8 part is unused and in its original packaging.
Return procedure for AT25256-10PC-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25256-10PC-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…
