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Microchip Technology AT25256A-10TI-2.7
- Part No.:
- AT25256A-10TI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25256A-10TI-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
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Product details
Overview
AT25256A-10TI-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8 bits, operating from 2.7V to 5.5V, featuring 20 MHz max clock rate at 5V, 64-byte page write capability, and hardware/software write protection via WP and HOLD pins. It serves as nonvolatile configuration storage in industrial control modules requiring reliable low-voltage data retention.
For engineers reviewing the AT25256A-10TI-2.7 datasheet, AT25256A-10TI-2.7 pinout, AT25256A-10TI-2.7 application, or AT25256A-10TI-2.7 equivalent, key selection criteria include its JEDEC SOIC-8 package, -40°C to +85°C industrial temperature range, 100,000 write endurance, >100-year data retention, and SPI Mode 0/3 compatibility with microcontroller peripherals.
Technical Context
The AT25256A-10TI-2.7 implements a synchronous 3-wire SPI slave interface with dedicated SI (input), SO (output), SCK (clock), and CS (chip select), supporting MSB-first transmission and op-code–driven command execution. Its internal architecture includes an 8-bit instruction register, nonvolatile status register with BP0/BP1 block protection bits, and WPEN-controlled hardware write protection logic.
Timing is fully self-timed: write cycles complete in ≤5 ms with no external erase step required; HOLD suspends ongoing transfers without resetting sequence state; and READY/BUSY status is monitored via bit 0 of the status register during internal writes. All DC and AC parameters are specified across VCC = 2.7–5.5 V and TA = −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8), enabling storage of firmware patches or calibration tables in space-constrained embedded systems |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting |
| Max Clock Frequency | 20 MHz at VCC = 5 V - delivers up to 2.5 MB/s effective serial throughput for rapid configuration loading |
| Write Endurance | 100,000 cycles - ensures robust operation in logging or parameter-tuning applications with frequent updates |
| Data Retention | >100 years - guarantees long-term integrity of stored device settings across product lifecycles |
| Page Write Size | 64 bytes - minimizes write latency versus byte-write mode and reduces host CPU overhead per update |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation, motor drives, and outdoor metering environments |
Pinout & Package
AT25256A-10TI-2.7 is housed in an 8-lead JEDEC SOIC package (package code 8S1), 0.150" wide body, with standard gull-wing lead form and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; leads are Pb-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable: pulls device into active communication state; high-Z SO when deasserted |
| SO | Serial Data Output | Tri-state open-drain output delivering read data or status bits; high-impedance when CS high or HOLD active |
| WP | Write Protect input | Hardware lock: when low and WPEN=1, blocks all status register and protected memory writes |
| GND | Ground reference | Primary return path for VCC and I/O signals; must be low-impedance to minimize noise on SPI lines |
| VCC | Power supply | Single 2.7–5.5 V rail powers core logic and I/O buffers; decoupling capacitor required near pin |
| HOLD | Communication suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK low during assertion |
| SCK | Serial Clock input | Master-generated edge-triggered clock synchronizing SI sampling and SO output timing |
| SI | Serial Data Input | Command, address, and write-data input; sampled on SCK rising edge in SPI Mode 0 |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 support | Interoperates with both Motorola- and TI-style microcontroller SPI peripherals without protocol translation |
| Block write protection | Configurable 1/4, 1/2, or full-array lock via status register BP0/BP1 bits - prevents accidental firmware corruption |
| Hardware + software protection | WP pin and WRSR/WREN instructions provide layered security against unintended writes during power-up or reset |
| Self-timed write cycle | No external timing control needed; host polls RDSR bit 0 to detect completion - simplifies driver implementation |
| Industrial temperature grade | Validated operation from −40°C to +85°C ensures reliability in factory-floor PLCs and HVAC controllers |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing I/O mapping tables, calibration offsets, and user-defined logic configurations in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile serial memory providing SPI-accessible parameter storage with deterministic 5 ms write latency. Use Value: Enables field-upgradable control logic without requiring external parallel memory or complex programming infrastructure. | Use Scenario: Retaining seat position presets, mirror adjustment profiles, and lighting configuration across ignition cycles in BCMs. IC Role / Device Role / Timing Role: Low-power SPI EEPROM interfaced directly to 3.3 V automotive microcontrollers for persistent user preference storage. Use Value: Delivers >100-year data retention and 100K write cycles - exceeding OEM requirements for vehicle lifetime durability. |
| Smart Energy Meter Firmware Patching | Medical Infusion Pump Calibration Data |
Use Scenario: Hosting small firmware patches or regulatory compliance updates downloaded over HAN or PLC networks. IC Role / Device Role / Timing Role: Secure, block-protected serial memory allowing authenticated patch installation while locking critical boot sectors. Use Value: Supports remote field updates with hardware-enforced write protection - eliminating need for costly service visits. | Use Scenario: Storing flow-rate calibration coefficients, sensor offset values, and safety-critical operational limits in Class II medical devices. IC Role / Device Role / Timing Role: AEC-Q100–informed industrial-grade EEPROM ensuring traceable, tamper-resistant storage of FDA-mandated parameters. Use Value: Meets IEC 62304 software lifecycle requirements via guaranteed 100K write endurance and >100-year retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DW | Same 256 Kbit density, 2.5–5.5 V supply, but rated for 5 MHz max clock at 2.5 V; uses different status register layout and lacks HOLD pin | Lower speed ceiling and no suspend capability limit use in high-throughput or real-time interrupt-driven systems | Select when cost sensitivity outweighs need for 20 MHz operation or HOLD functionality |
| BR25H256FJ-2CE2 | 256 Kbit, 1.7–5.5 V, 20 MHz capable, built-in error correction (ECC), and AEC-Q100 Grade 2 qualification (-40°C to +105°C) | Enhanced reliability features suit automotive ADAS and infotainment where ECC mitigates soft errors | Prefer for automotive applications requiring extended temperature margin and fault-tolerant memory |
Compared with M95256-DW and BR25H256FJ-2CE2, AT25256A-10TI-2.7 offers optimal balance of speed, industrial temperature compliance, and dual hardware/software write protection - making it ideal for cost-sensitive industrial control designs where HOLD and precise block protection are essential.
Availability
AT25256A-10TI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and smart energy meters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT25256A-10TI-2.7 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 AT25256A-10TI-2.7 belongs to Microchip's industrial-grade serial EEPROM product line, designed specifically for robust nonvolatile storage in harsh environments where voltage flexibility, data integrity, and long-term reliability are mandatory.
FAQ
What is the maximum clock frequency supported by AT25256A-10TI-2.7?
AT25256A-10TI-2.7 supports up to 20 MHz SCK frequency at VCC = 4.5–5.5 V, 10 MHz at 2.7–3.6 V, and 5 MHz at 1.8–2.6 V. The actual maximum depends on supply voltage per AC Characteristics table - at 2.7 V, the rated maximum is 10 MHz. This ensures timing compliance across its full 2.7–5.5 V operating range without derating.
Does AT25256A-10TI-2.7 support SPI Mode 1 or Mode 2?
No, AT25256A-10TI-2.7 explicitly supports only SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in the Features section and Serial Interface description. Modes 1 and 2 are not implemented - attempting them will result in incorrect data sampling or communication failure.
How does the HOLD pin function during an active write cycle in AT25256A-10TI-2.7?
The HOLD pin cannot suspend an internal write cycle once initiated in AT25256A-10TI-2.7. It only pauses ongoing serial communication (e.g., READ or WRITE instruction transmission) before the CS high-to-low transition that triggers the internal write. During tWC (≤5 ms), HOLD has no effect - RDSR remains the only valid command.
What package type is used for AT25256A-10TI-2.7?
AT25256A-10TI-2.7 uses an 8-lead JEDEC SOIC package (package code 8S1), 0.150" wide body, with gull-wing leads, 1.27 mm pitch, and Pb-free/RoHS-compliant finish. This matches the "TI" suffix in the part number, which denotes JEDEC-standard SOIC per Atmel's ordering guide.
Can AT25256A-10TI-2.7 be used in automotive applications requiring AEC-Q200 qualification?
AT25256A-10TI-2.7 is specified for industrial temperature range (−40°C to +85°C) and carries automotive-grade process qualifications, but it is not AEC-Q200 certified. For AEC-Q200–mandated applications, Microchip recommends BR25H256FJ-2CE2 or equivalent qualified variants - AT25256A-10TI-2.7 is intended for industrial, not automotive safety-critical systems.
AT25256A-10TI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT25256A-10TI-2.7 FAQ
1.How can I place an order for AT25256A-10TI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256A-10TI-2.7 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 AT25256A-10TI-2.7 reliable?
The price and inventory of AT25256A-10TI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25256A-10TI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256A-10TI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256A-10TI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256A-10TI-2.7?
AT25256A-10TI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256A-10TI-2.7 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 AT25256A-10TI-2.7?
For technical support, including AT25256A-10TI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256A-10TI-2.7 requirements.
6.How does Aetrix verify that AT25256A-10TI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256A-10TI-2.7 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 AT25256A-10TI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256A-10TI-2.7?
All AT25256A-10TI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256A-10TI-2.7, 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 AT25256A-10TI-2.7 part is unused and in its original packaging.
Return procedure for AT25256A-10TI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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