In aerospace and defense systems, reliable non-volatile memory is critical for storing critical flight data, mission parameters, and system configurations. The ATMEL AT28C256-15DM/883 is a military-grade parallel EEPROM designed to meet these demanding requirements, providing persistent data storage that retains information even when power is removed.
This device combines high-speed access with robust environmental tolerance, making it suitable for applications where data integrity and system responsiveness are paramount. Its hermetic ceramic package ensures protection against harsh conditions, while compliance with military screening standards guarantees consistent performance in extreme environments.
Related Products For Your Business
The Atmel (now Microchip) AT28C256-15DM/883 is a 256Kbit (32,768 × 8) paged parallel EEPROM, 150ns access time, MIL-STD-883 Class B screened, in a 28-lead hermetic ceramic Cerdip package — operating from −55°C to +125°C full military temperature range. It is the directly smaller sibling to the AT28C010-12DM/883, sharing the same page-write architecture, software data protection, 5V supply, and MIL-STD-883 Class B qualification, but in a smaller 28-pin footprint at one-quarter the capacity.
AT28C256 vs. AT28C010 — Capacity & Pinout Comparison
| Parameter | AT28C256-15DM/883 (this) | AT28C010-12DM/883 |
|---|---|---|
| Capacity | 256Kbit (32K × 8) | 1Mbit (128K × 8) |
| Access Time | 150 ns | 120 ns |
| Package | 28-CDIP (Cerdip) | 32-CDIP (Cerdip) |
| Address Pins | A0–A14 (15 pins) | A0–A16 (17 pins) |
| Temperature Range | −55°C to +125°C | −55°C to +125°C |
| Screening | MIL-STD-883 Class B | MIL-STD-883 Class B |
| Page Write Buffer | 64 bytes | 128 bytes |
| Write Endurance | 10,000 cycles | 10,000 cycles |
| Supply Voltage | 5V | 5V |
The AT28C256 is the appropriate selection when 256Kbit of nonvolatile storage is sufficient — common in boot ROM, calibration table, configuration parameter, and firmware revision storage for embedded defense electronics where the 1Mbit AT28C010 exceeds requirements. The smaller 28-pin Cerdip package reduces board footprint on pin-constrained PCBs, and the 64-byte page write buffer still enables fast burst writes for parameter update sequences. The 150ns access time is compatible with all processor buses designed for the commercial AT28C256, allowing direct military-grade substitution without bus timing changes. MIL-STD-883 Class B screening, Cerdip hermetic package, and full −55°C to +125°C operation make this the standard nonvolatile memory for avionics embedded controllers, satellite housekeeping processors, and defense electronic warfare system configuration storage.
FAQ
What does AT28C256-15DM/883 decode to?
AT28C = Atmel EEPROM family; 256 = 256Kbit (262,144 bits); −15 = 150ns access time; D = 28-lead Cerdip hermetic ceramic package; M = military temperature (−55°C to +125°C); /883 = MIL-STD-883 Class B screening.
What is the page write buffer size for AT28C256?
64 bytes — half that of the AT28C010 (128 bytes). Up to 64 bytes within the same 64-byte page boundary can be written in a single write cycle, with the device self-timing the internal EEPROM write (~10ms) while the bus is free.
Can AT28C256-15DM/883 directly replace a commercial AT28C256-15PC?
Electrically and functionally yes — same access time, same interface, same pinout. The military Cerdip package is mechanically larger than the commercial PDIP but uses the same 28-pin DIP socket pattern. Verify socket/board clearance for the ceramic body before substituting.
What is the difference in page size between AT28C256 and AT28C010?
AT28C256 uses a 64-byte page write buffer; AT28C010 uses a 128-byte buffer. Applications writing large sequential blocks will achieve higher throughput with the AT28C010, while the AT28C256 is appropriate when 64-byte pages match the application’s natural block size.
Is this part still manufactured by Microchip?
Microchip Technology acquired Atmel in 2016 and continues to manufacture and support the AT28C256 and AT28C010 military-grade lines. The AT28C256-15DM/883 remains an active part number. Confirm availability and lead time with Microchip or authorized distributors.
What certifications and qualification documentation ship with this part?
MIL-STD-883 Class B certificate of conformance, lot traveler records with burn-in and electrical test data, and date code documentation. Full DLA traceability is maintained via the DESC SMD number. AS6081-compliant anti-counterfeit inspection is available from Sparkle Milchip inventory.
