My Inquiry
My Account
Microchip Technology AT25256AU2-10UI-1.8
- Part No.:
- AT25256AU2-10UI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFBGA, DSBGA
- Datasheet:
-
AT25256AU2-10UI-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 8DBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,446
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT25256AU2-10UI-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8 bits, operating from 1.8 V to 5.5 V with 5 ms max self-timed write cycle, 100,000 write endurance, and >100-year data retention. It features hardware write protection via WP pin, HOLD for serial suspend, and block protection for 1/4, 1/2, or full memory array - deployed in automotive control modules requiring robust nonvolatile storage at low supply voltage.
For engineers reviewing the AT25256AU2-10UI-1.8 datasheet, AT25256AU2-10UI-1.8 pinout, AT25256AU2-10UI-1.8 application, or AT25256AU2-10UI-1.8 equivalent, key selection criteria include 1.8 V operation compatibility, JEDEC SOIC-8 package footprint, SPI Mode 0/3 timing compliance, and hardware/software dual-write-protection architecture for safety-critical firmware parameter storage.
Technical Context
The AT25256AU2-10UI-1.8 implements a synchronous SPI slave interface with separate SI (input) and SO (output) pins, supporting MSB-first transmission and op-code–driven command set including WREN, WRITE, RDSR, and WRSR. Its status register (BP0/BP1/WPEN/WEN/RDY) enables configurable block protection and write-enable state tracking.
It uses an internal 64-byte page write buffer and auto-incrementing address counter; write cycles are fully self-timed with no external erase step required. The HOLD pin suspends ongoing serial communication without resetting the sequence, while WP provides hardware-level inhibition of status register writes when WPEN = 1 and WP = low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8), enabling storage of boot configuration, calibration data, or device identity in space-constrained embedded systems |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V logic families and backward compatibility with 3.3 V/5 V microcontrollers |
| Max Clock Frequency | 5 MHz at 1.8 V - ensures reliable SPI communication in ultra-low-power sensor nodes and battery-operated devices |
| Write Cycle Time | 5 ms maximum - defines minimum interval between successive byte/page writes; critical for real-time logging applications |
| Endurance & Retention | 100,000 write cycles / >100 years data retention - meets long-life requirements for industrial controllers and automotive ECUs |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade deployment in motor drives, power supplies, and HVAC controls |
| Package | 8-lead JEDEC SOIC (8S1), 150-mil width - drop-in compatible with standard SOIC-8 PCB footprints and reflow assembly processes |
Pinout & Package
AT25256AU2-10UI-1.8 is housed in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide body, with gull-wing leads and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable: pulls device into active SPI mode; high-Z SO output when CS high |
| SO | Serial Data Output | Tri-state open-drain output delivering read data or status bits; high-impedance when CS high or during HOLD |
| WP | Write Protect input | Hardware lock: disables status register writes when WP = low and WPEN = 1 - prevents accidental firmware corruption |
| GND | Ground reference | Signal and power return path; must be low-impedance to maintain noise immunity during SPI clock transitions |
| VCC | Power supply | 1.8–5.5 V input; decoupling capacitor (0.1 µF) required within 10 mm for stable 5 MHz operation |
| HOLD | Serial suspend control | Pauses ongoing read/write transfer without resetting bit counter - enables multi-master arbitration or interrupt servicing |
| SCK | Serial Clock input | Master-generated edge-triggered clock; timing parameters (tWH/tWL ≥ 80 ns @ 1.8 V) constrain max SCK frequency |
| SI | Serial Data Input | Command/address/data input synchronized to SCK falling edge; accepts op-codes, addresses, and payload bytes |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 support | Enables interoperability with diverse microcontrollers (e.g., ARM Cortex-M, PIC, STM32) without protocol translation logic |
| 64-byte page write buffer | Reduces total programming time by 64× vs. byte-write; critical for efficient firmware update staging in constrained MCU RAM |
| Configurable block protection | BP0/BP1 bits allow selective locking of top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or full array (0000–7FFFh) - isolates critical bootloader sectors |
| WP and HOLD dual-suspend capability | WP secures configuration registers against errant writes; HOLD pauses live transfers - together they enable safe field updates under dynamic load |
| 1.8 V operation with 5 MHz clock | Permits direct connection to 1.8 V I/O domains (e.g., LPDDR I/O, ultra-low-power MCUs), eliminating level-shifter components and BOM cost |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angle offsets, and lighting profiles across vehicle lifecycle. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via SPI during power-up and runtime adjustment; RDY/BUSY flag synchronizes MCU polling. Use Value: 100,000-cycle endurance supports daily user adjustments over 10+ years; 1.8 V operation interfaces directly with ASIL-B domain MCUs. | Use Scenario: Retaining I/O mapping, PID tuning constants, and alarm thresholds after power loss in factory automation controllers. IC Role / Device Role / Timing Role: SPI-configurable EEPROM holding persistent configuration; WRSR sets BP1/BP0 to lock calibration data against overwrite. Use Value: Block protection prevents accidental corruption during firmware upload; >100-year retention eliminates periodic backup maintenance. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing flow-rate calibration coefficients, dose limits, and audit logs subject to regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure parameter vault with hardware WP pin tied low and WPEN=1 - physically prevents unauthorized register modification. Use Value: Dual protection (WP + WRSR) satisfies IEC 62304 software safety classification; −40°C to +85°C rating covers clinical environment thermal range. | Use Scenario: Holding tariff tables, meter ID, cryptographic keys, and tamper-event counters in utility-grade electricity meters. IC Role / Device Role / Timing Role: SPI EEPROM integrated into secure boot chain; HOLD pin used to pause reads during RF transmission bursts to avoid bus contention. Use Value: HOLD functionality maintains data integrity during wireless comms; 5 ms write cycle enables fast event logging without MCU blocking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN6TP/K | STMicroelectronics 256 Kbit SPI EEPROM; 1.8–5.5 V, 20 MHz max @ 5 V but only 5 MHz @ 1.8 V; same SOIC-8 package | Higher max clock at 5 V, identical 1.8 V timing - suitable where legacy 5 V systems coexist with new 1.8 V designs | Select when leveraging ST's ecosystem tools or requiring identical AC specs across mixed-voltage platforms |
| BR25H256FJ-WE2 | Rohm 256 Kbit SPI EEPROM; 1.6–5.5 V, 10 MHz max @ 1.8 V; 8-pin TSSOP (8A2), not SOIC - different footprint | Wider voltage range (1.6 V) and faster 1.8 V clock; requires PCB layout change due to TSSOP-8 vs. SOIC-8 | Choose for next-gen ultra-low-power designs needing sub-1.8 V margin or higher throughput, accepting footprint redesign |
Compared with M95256-DRMN6TP/K and BR25H256FJ-WE2, the AT25256AU2-10UI-1.8 offers guaranteed JEDEC SOIC-8 compatibility and proven automotive qualification, making it optimal for drop-in replacement in existing industrial and automotive boards without layout revision or timing revalidation.
Availability
AT25256AU2-10UI-1.8 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for AT25256AU2-10UI-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with broad industrial and automotive qualification capabilities.
The AT25256AU2-10UI-1.8 belongs to Microchip's legacy Atmel SPI EEPROM product line, engineered for reliable, low-voltage nonvolatile storage in safety-aware embedded systems where data integrity and long-term retention are mandatory.
FAQ
What is the supply voltage range supported by the AT25256AU2-10UI-1.8?
The AT25256AU2-10UI-1.8 operates from 1.8 V to 5.5 V, enabling direct integration with 1.8 V logic families and backward compatibility with 3.3 V and 5 V microcontrollers. This dual-range capability eliminates level shifters in mixed-voltage designs and ensures stable operation across battery discharge curves in portable equipment. The AT25256AU2-10UI-1.8 maintains full AC/DC specifications across this entire range, including 5 MHz max SCK at 1.8 V.
How does the WRITE PROTECT (WP) pin function on the AT25256AU2-10UI-1.8?
The WP pin on the AT25256AU2-10UI-1.8 provides hardware-level write inhibition when pulled low and the WPEN bit in the status register is set to 1. In this state, all writes to the status register-including BP0/BP1 protection bits-are blocked, preventing accidental firmware corruption. If WPEN = 0, the WP pin is ignored, allowing full register access even with WP grounded. This dual-mode design makes the AT25256AU2-10UI-1.8 adaptable to both secured and flexible development environments.
What is the maximum clock frequency for the AT25256AU2-10UI-1.8 at 1.8 V operation?
At 1.8 V supply, the AT25256AU2-10UI-1.8 supports a maximum SCK clock frequency of 5 MHz, as specified in the AC Characteristics table for VCC = 1.8–3.6 V. This timing is validated across the full industrial temperature range (−40°C to +85°C) and ensures reliable data capture with adequate setup/hold margins. The AT25256AU2-10UI-1.8 maintains consistent 5 MHz performance regardless of temperature or process variation, simplifying timing closure in low-power MCU designs.
Does the AT25256AU2-10UI-1.8 support page write operations, and what is the page size?
Yes, the AT25256AU2-10UI-1.8 supports 64-byte page write operations, allowing up to 64 sequential bytes to be programmed in a single write cycle. The internal address counter auto-increments after each byte, wrapping within the 64-byte boundary. This feature reduces total programming time by up to 64× versus byte-wise writes and is essential for efficient firmware parameter updates. The AT25256AU2-10UI-1.8 enforces page boundaries strictly - crossing a 64-byte boundary during a page write causes rollover and potential data overwrite.
What package type is used for the AT25256AU2-10UI-1.8, and is it industry-standard?
The AT25256AU2-10UI-1.8 uses an 8-lead JEDEC-standard SOIC package (designated 8S1), with 0.150" body width and gull-wing leads. This is a fully compliant JEDEC MO-002AC package, identical to widely used SOIC-8 footprints in industrial and automotive PCBs. The AT25256AU2-10UI-1.8 requires no special assembly processes and is compatible with standard reflow profiles, making it ideal for high-volume manufacturing and second-source flexibility.
AT25256AU2-10UI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-dBGA (2.35x3.73)
AT25256AU2-10UI-1.8 FAQ
1.How can I place an order for AT25256AU2-10UI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256AU2-10UI-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 AT25256AU2-10UI-1.8 reliable?
The price and inventory of AT25256AU2-10UI-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 AT25256AU2-10UI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25256AU2-10UI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256AU2-10UI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256AU2-10UI-1.8?
AT25256AU2-10UI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256AU2-10UI-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 AT25256AU2-10UI-1.8?
For technical support, including AT25256AU2-10UI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256AU2-10UI-1.8 requirements.
6.How does Aetrix verify that AT25256AU2-10UI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25256AU2-10UI-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 AT25256AU2-10UI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25256AU2-10UI-1.8?
All AT25256AU2-10UI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256AU2-10UI-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 AT25256AU2-10UI-1.8 part is unused and in its original packaging.
Return procedure for AT25256AU2-10UI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25256AU2-10UI-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…
