ATMEL AT28C256-25DM/883
- 256Kbit (32K × 8) non-volatile parallel EEPROM memory
- 250ns access time for reliable data retrieval in military embedded systems
- 5V single-supply operation for simplified system design
- Hermetic 28-lead ceramic DIP (Cerdip) package for long-term environmental protection
- Qualified to MIL-STD-883 Class B military screening standards
Atmel (now Microchip Technology) is one of the most established names in military-grade non-volatile memory, with decades of supply history to defense prime contractors, aerospace OEMs, and government procurement programs worldwide. The AT28C256-25DM/883 is available from stock at Sparkle Electronics — a specialized distributor of high-reliability and MIL-SPEC electronic components serving defense systems integrators and aerospace procurement teams globally. As a MIL-STD-883 Class B screened parallel EEPROM in a hermetic ceramic DIP package, this device is designed for applications where stored data must survive extreme thermal cycling, mechanical shock, and extended operational life: avionics flight management systems, missile guidance and control electronics, radar processing units, military vehicle embedded controllers, and shipboard navigation systems all rely on this class of memory for long-term code and parameter storage.
The AT28C256-25DM/883 provides 256Kbit of addressable storage organized as 32,768 × 8 bits, with a 250ns access time compatible with a wide range of military embedded processors. Its hermetic 28-lead Cerdip package satisfies the moisture resistance and hermeticity requirements demanded by MIL-STD-883 screening — a critical differentiator from plastic-packaged commercial equivalents on platforms with multi-decade service life expectations. Procurable under DESC SMD number 5962-88525 03 XA, this part provides full QPL traceability within the DLA qualified parts system for defense procurement workflows. Contact Sparkle Electronics to confirm stock availability and request a quote.
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Buy AT28C256-25DM/883 from Stock — MIL-STD-883 EEPROM for Aerospace & Defense
Sparkle Electronics maintains ready stock of the AT28C256-25DM/883 for immediate fulfillment to defense contractors, government procurement offices, and aerospace systems integrators worldwide. Whether you are sourcing AT28C256-25DM/883 for a new program build, a legacy system repair, or a QPL-qualified procurement under DESC SMD 5962-88525 03 XA, our team provides same-day response for qualified inquiries. Submit a request and receive pricing, stock confirmation, and lead time within 24 hours.
AT28C256-25DM/883 vs. Commercial Variants
Defense procurement engineers frequently need to document the rationale for specifying a military-screened device over a commercial equivalent. The table below captures the key qualification and construction differences:
| Parameter | AT28C256-25DM/883 | AT28C256-25PC (commercial) |
|---|---|---|
| Manufacturer | Atmel / Microchip | Atmel / Microchip |
| Availability | In Stock at Sparkle | — |
| Access Time | 250ns | 250ns |
| Package | 28-lead Ceramic DIP (Cerdip) | 28-lead PDIP (plastic) |
| Temperature Range | −55°C to +125°C | 0°C to +70°C |
| Screening | MIL-STD-883 Class B | Commercial only |
| SMD Number | 5962-88525 03 XA | N/A |
| Active Current | 50mA max | 50mA max |
| Standby Current | 200µA max | 200µA max |
| Write Endurance | 10,000 cycles min | 10,000 cycles |
| Page Write Buffer | 64 bytes | 64 bytes |
| Supply Voltage | 5V ±10% | 5V ±10% |
The Cerdip package delivers glass-sealed hermetic protection that no plastic-packaged equivalent can replicate over a multi-decade defense platform service life. On airborne, shipboard, or ground-based military systems where mid-service component replacement is operationally or logistically infeasible, the hermetic ceramic construction of the AT28C256-25DM/883 is not optional — it is the minimum acceptable specification.
Page Write, Data Protection, and Device Identification
The 64-byte page write buffer allows the host processor bus to be released immediately after loading a full page of data. The on-chip write state machine then completes the internal programming cycle autonomously in approximately 10ms, reducing bus contention during bulk firmware or mission parameter update operations — particularly important in military embedded architectures with tightly scheduled bus arbitration.
A software data protection mechanism secures the full 256Kbit array against inadvertent writes. Once the 3-byte enable sequence is issued, no write operation is accepted without the corresponding unlock sequence, guarding stored code and mission-critical parameters from corruption caused by power-up transients, bus glitches, or unintended write events. This protection state persists through power cycling. An additional 64 bytes of EEPROM supports device identification, lot serialization, or calibration constants, accessible independently of the main array — directly useful for defense logistics, traceability, and MIL-SPEC documentation requirements.
Within the same Atmel military EEPROM family, procurement engineers can reference closely related screened devices depending on speed and package requirements. The ATMEL AT28C256-20LM/883 offers a faster 200ns access time in a 32-pad ceramic LCC package under the same MIL-STD-883 Class B screening. For higher storage density requirements, the ATMEL AT28C010-12DM/883 provides 1Mbit capacity in a hermetic ceramic DIP package with compatible parallel bus architecture, simplifying density migration on existing board designs without interface redesign.
Frequently Asked Questions
What does AT28C256-25DM/883 decode to?
AT28C = Atmel parallel EEPROM family; 256 = 256Kbit (262,144 bits); −25 = 250ns access time; D = 28-lead ceramic DIP (Cerdip) package; M = military temperature range (−55°C to +125°C); /883 = MIL-STD-883 Class B screening.
Where can I buy AT28C256-25DM/883 in stock?
Sparkle Electronics stocks the AT28C256-25DM/883 for immediate fulfillment. Contact our team for current pricing, available quantity, and confirmed lead time. We serve defense prime contractors, government procurement offices, and aerospace systems integrators globally.
What is the DESC SMD number for AT28C256-25DM/883?
5962-88525 03 XA — the Defense Electronics Supply Center Standard Military Drawing number for the AT28C256-25DM/883, enabling full QPL traceability within the DLA defense procurement system.
What is the difference between AT28C256-25DM/883 and the commercial AT28C256?
The /883 suffix confirms MIL-STD-883 Class B screening: 100% burn-in at elevated temperature, electrical characterization at −55°C and +125°C extremes, and hermeticity verification. The DM package is a 28-lead hermetic ceramic DIP — fundamentally different from the plastic PDIP used in commercial variants in terms of moisture resistance, mechanical durability, and long-term field reliability.
How does the 64-byte page write buffer work?
Up to 64 bytes within the same page boundary can be loaded into the internal page register in a single bus cycle. The device self-times the write operation on-chip and completes programming in approximately 10ms, freeing the address and data bus for other system operations during the write cycle.
Is a higher write endurance version of AT28C256-25DM/883 available?
Yes. The AT28C256E-25DM/883 provides 100,000 write cycles minimum under the same MIL-STD-883 Class B screening and identical Cerdip package. Specify the E variant for applications requiring frequent in-system updates such as mission parameter reconfiguration, onboard calibration storage, or flight data logging. Contact us to confirm stock and pricing for the E variant.
Sourcing AT28C256-25DM/883 for a defense or aerospace program? Sparkle Electronics stocks Atmel military EEPROM with full documentation support for MIL-STD-883 and QPL procurement workflows. Submit an inquiry — our team responds within 24 hours with pricing, stock confirmation, and lead time.
