Microchip logo
  • All
  • Products
  • Documents
  • Applications Notes
  • product video
product primary image

AT25256B

256Kb SPI Serial EEPROM

Status: In Production

Features:

  • 32,768 x 8-bit (256 Kbit)
  • Supports SPI modes 0 and 3
  • Up to 20 MHz clock frequency
  • Self-Timed Erase and Write Cycles (5 ms max.)
  • Read current: 7 mA (Max) at 10 MHz
  • Write current: 7mA (Max) at 10 MHz
  • Standby current: 3μA (Max) at 1.8V, 5μA (Max) at 5 V
  • Block Write Protection: Protect 1/4, 1/2 or Entire Array
  • More than 1 million erase/write cycles
  • Data retention 100 years
  • Automotive Grade 1: -40°C to 125°C
  • Automotive Grade 2: -40°C to 105°C
  • Automotive Grade 3 / Industrial: -40°C to 85°C
  • Automotive AECQ-100 Qualified1
  • Factory Programming Available
  • Available in standard packages including 8-lead SOIC, and advanced packages including 8-lead TSSOP, 8-lead 2x3 DFN, and 8-ball VFBGA
View More
Overview
Documents
Development Environment
Similar Devices
RoHS Information
Buy Now

Device Overview

Summary

The Microchip AT25256B is a 256 Kb Serial EEPROM utilizing the industry standard Serial Peripheral Interface (SPI) compatible serial bus. The device is organized as one block of 32,768 x 8-bit and is optimized for use in consumer electronics, industrial, medical, and automotive applications where reliable and dependable nonvolatile memory storage is essential. Software write protection allows the user to protect ¼, ½, or the entire memory array. A hardware write protect pin is also provided, which additionally protects against inadvertent writes to the status register. The EEPROM is available in a variety of space-saving packaging options.

For product comparison, please consider: 25AA256, 25LC256

Additional Features
    • 32,768 x 8-bit (256 Kbit)
    • Serial Peripheral Interface (SPI) Compatible
      • Supports SPI modes 0 and 3
      • Up to 20 MHz clock frequency
    • Self-Timed Erase and Write Cycles (5 ms max.)
    • Low Power Consumption
      • Read current: 7 mA (Max) at 10 MHz
      • Write current: 7mA (Max) at 10 MHz
      • Standby current: 3μA (Max) at 1.8V, 5μA (Max) at 5 V
    • Block Write Protection: Protect 1/4, 1/2 or Entire Array
    • More than 1 million erase/write cycles
    • Data retention 100 years
    • Temperature Ranges Available
      • Automotive Grade 1: -40°C to 125°C
      • Automotive Grade 2: -40°C to 105°C
      • Automotive Grade 3 / Industrial: -40°C to 85°C
    • Automotive AECQ-100 Qualified1
    • Factory Programming Available
    • Available in standard packages including 8-lead SOIC, and advanced packages including 8-lead TSSOP, 8-lead 2x3 DFN, and 8-ball VFBGA

    1Consult Automotive datasheet for device specification and ordering part number

Parametrics
Name
Value
Density
256 Kbit
Op. Volt Range (V)
1.8 to 5.5
Max. Clock Freq.
20 MHz
Page Size (bytes)
64
Write Protect
Quarter, Half, Whole Array
Temp Range (°C)
-40°C to +125°C
Endurance
1,000,000
Bus Modes
SPI

Documents

Jump to:

Brochures


Development tools data is currently unavailable.

Similar Devices

Product
Memory Size
Memory Speed
Package
Price 5K
256K
10 MHz
DFN-S-8, PDIP-8, SOIC-8, SOIJ-8, TSSOP-8
$0.87
256K
10 MHz
DFN-S-8, PDIP-8, SOIC-8, SOIJ-8, TSSOP-8
$0.87
 
20 MHz
SOIC-8, TSSOP-8, UDFN-8
$0.68

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
AT25256B-SSHL-B
0.075000
0.163265
8
SOIC
3.90mm(.150in)
NiPdAu
e4
AT25256B-SSHL-T
0.075000
0.250000
8
SOIC
3.90mm(.150in)
NiPdAu
e4
AT25256B-XHL-B-899
0.035800
0.190000
8
TSSOP
4.4mm
NiPdAu
e4
AT25256B-XHL-T-537
0.035800
0.199200
8
TSSOP
4.4mm
NiPdAu
e4
AT25256B-XPDGV-T
0.035800
0.199200
8
TSSOP
4.4mm
NiPdAu
e4
AT25256B-MAPDGV-E
0.009600
0.084000
8
UDFN
2x3x0.6mm
NiPdAu
e4
AT25256B-MAPDGV-T
0.009600
0.084000
8
UDFN
2x3x0.6mm
NiPdAu
e4
AT25256B-MAHL-E
0.009600
0.084000
8
UDFN
2x3x0.6mm
NiPdAu
e4
AT25256B-SSPDGV-T
0.075000
0.250000
8
SOIC
3.90mm(.150in)
NiPdAu
e4
AT25256B-SSHL-B-899
0.075000
0.163265
8
SOIC
3.90mm(.150in)
NiPdAu
e4
AT25256B-SSHL-T-537
0.075000
0.250000
8
SOIC
3.90mm(.150in)
NiPdAu
e4
AT25256B-SSHL-T-899
0.075000
0.250000
8
SOIC
3.90mm(.150in)
NiPdAu
e4
AT25256B-XHL-B
0.035800
0.190000
8
TSSOP
4.4mm
NiPdAu
e4
AT25256B-XHL-T
0.035800
0.199200
8
TSSOP
4.4mm
NiPdAu
e4
AT25256B-MAHL-T
0.009600
0.084000
8
UDFN
2x3x0.6mm
NiPdAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

Buy from the Microchip Store

Grid
View
Table
View
Filter:
Apply
Clear
Only show products with samples
Product
Leads
Package Type
Temp Range
Packing Media
5K Pricing
Buy