EPROM OTP 256K-Bit 32K x 8 45ns 28-Pin PDIP

$2.49 ea

  • RoHS Compliant
# of units Price
1+ $2.49
10+ $2.25
100+ $1.75

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256k (32k x 8) OTP EPROM

The AT27C256R is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM) organized 32k x 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45 ns, eliminating the need for speed reducing WAIT states on high-performance microprocessor systems.


  • Fast Read Access Time - 45 ns
  • Low-Power CMOS Operation (100 µA Max Standby, 20 mA Max Active at 5 MHz)
  • 5V ± 10% Supply
  • High Reliability CMOS Technology (2,000V ESD Protection, 200 mA Latchup Immunity)
  • Rapid Programming Algorithm - 100 µs/Byte (Typical)
  • CMOS and TTL Compatible Inputs and Outputs
  • Integrated Product Identification Code
  • Industrial and Automotive Temperature Ranges
  • 28-pin PDIP package

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  • Specification Value
    Supplier PackagePDIP
    Interface TypeParallel
    Output Enable Access Time20ns
    Programming Voltage13V
    Maximum Operating Current20mA
    Maximum Random Access Time45ns
    Minimum Operating Supply Voltage4.5V
    Typical Operating Supply Voltage5V
    Maximum Operating Supply Voltage5.5V
    In System ProgrammabilityExternal
    Reprogramming TechniqueOTP
    Minimum Operating Temperature-40°C
    Maximum Operating Temperature85°C
    Screening LevelIndustrial
    MountingThrough Hole
    Product Width15.49mm(Max)
    Product Height4.2mm(Max)
    Product Length37.85mm(Max)
    Product TypeEPROM

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