ATMEL AT28C256-20LM/883
- 256Kbit (32K × 8) non-volatile parallel EEPROM memory
- 200ns access time for high-speed data retrieval
- 5V single-supply operation for simplified system design
- Hermetic 32-pad ceramic LCC package for long-term environmental protection
- Qualified to MIL-STD-883 Class B military screening standards
Atmel (now Microchip Technology) has long been a trusted supplier of high-reliability non-volatile memory for military and aerospace programs. The AT28C256-20LM/883 is available from stock at Sparkle Electronics — a specialized distributor serving defense contractors, systems integrators, and aerospace procurement teams worldwide. As a MIL-STD-883 Class B screened parallel EEPROM, this device is purpose-built for applications where data integrity cannot be compromised: avionics flight computers, missile guidance systems, radar signal processors, and shipboard navigation equipment all depend on memory devices that hold their stored content through power loss, extreme thermal cycling, and prolonged operational stress.
The AT28C256-20LM/883 organizes 256Kbit of addressable storage as 32,768 × 8 bits, accessible at 200ns — fast enough for direct interface with a broad range of military embedded processors without wait-state penalties. Its hermetic 32-pad ceramic LCC package meets the hermeticity and environmental exposure requirements of MIL-STD-883 screening, making it suitable for airborne, ground-based, and shipboard defense platforms where plastic-packaged memory is not an acceptable long-term solution. For defense procurement engineers working under DESC SMD number 5962-88525 04 YA, this part provides full QPL traceability within the DLA qualified parts system. Contact Sparkle Electronics to request a quote or confirm available stock.
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Buy AT28C256-20LM/883 from Stock — Military EEPROM for Aerospace & Defense
Sparkle Electronics stocks the AT28C256-20LM/883 and ships to defense contractors, EMS providers, and government procurement offices worldwide. Whether you are searching for AT28C256-20LM/883 pricing, lead time, cross-reference, or datasheet confirmation, our team provides same-day response for qualified inquiries. Submit a request and receive pricing and availability within 24 hours.
AT28C256-20LM/883 vs. Commercial Variants
Procurement engineers sourcing MIL-SPEC EEPROM for defense platforms frequently need to justify the specification of a military-screened device over a commercial equivalent. The table below captures the key differences:
| Parameter | AT28C256-20LM/883 | AT28C256-20PC (commercial) |
|---|---|---|
| Manufacturer | Atmel / Microchip | Atmel / Microchip |
| Availability | In Stock at Sparkle | — |
| Access Time | 200ns | 200ns |
| Package | 32-pad Ceramic LCC | 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 04 YA | 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 ceramic LCC package provides hermetic sealing that no plastic-packaged equivalent can sustain across a multi-decade defense platform service life. For airborne, shipboard, or ground-based military systems where mid-mission component replacement is not operationally feasible, the AT28C256-20LM/883 is the correct long-term 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, with the on-chip write state machine completing the internal programming cycle autonomously in approximately 10ms — reducing bus contention during bulk firmware or calibration data update sequences in tightly scheduled military embedded systems.
A software data protection mechanism guards the entire 256Kbit array against inadvertent writes. Once the 3-byte enable sequence is issued, no write proceeds without the corresponding unlock sequence — protecting stored code and mission-critical parameters from corruption during power-up transients, bus glitches, or unintended write events. This protection persists through power cycling. An additional 64 bytes of EEPROM supports device identification, lot traceability, or calibration constants — accessible independently of the main array and useful for defense logistics and serialization workflows.
For programs requiring higher storage density under equivalent MIL-STD-883 Class B screening, the ATMEL AT28C010-12DM/883 provides 1Mbit capacity in a hermetic ceramic DIP package within the same Atmel military EEPROM family. Both devices share compatible software data protection architecture and parallel bus interface, simplifying density migration on existing board designs.
Frequently Asked Questions
What does AT28C256-20LM/883 decode to?
AT28C = Atmel parallel EEPROM family; 256 = 256Kbit (262,144 bits); −20 = 200ns access time; L = 32-pad ceramic LCC package; M = military temperature range (−55°C to +125°C); /883 = MIL-STD-883 Class B screening.
Where can I buy AT28C256-20LM/883 in stock?
Sparkle Electronics maintains ready stock of the AT28C256-20LM/883 for immediate fulfillment. Contact our team for current pricing, available quantity, and lead time. We serve defense contractors, government procurement offices, and aerospace systems integrators globally.
What is the DESC SMD number for AT28C256-20LM/883?
5962-88525 04 YA — the Defense Electronics Supply Center Standard Military Drawing number, enabling full QPL traceability within the DLA defense procurement system for AT28C256-20LM/883 procurement.
What is the difference between AT28C256-20LM/883 and the commercial AT28C256?
The /883 suffix indicates 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 LM package is a hermetic ceramic LCC — fundamentally different from the plastic PDIP used in commercial variants. These differences make the AT28C256-20LM/883 the correct choice for defense and aerospace programs with extended service life and environmental exposure requirements.
How does the AT28C256-20LM/883 page write function work?
Up to 64 bytes within the same page boundary can be loaded into the internal register in a single bus cycle. The device self-times the write operation on-chip, completing in approximately 10ms while freeing the address and data bus for other system operations — reducing bus contention in multi-master military embedded architectures.
Is a higher endurance version of AT28C256-20LM/883 available?
Yes. The AT28C256E-20LM/883 provides 100,000 write cycles minimum under the same MIL-STD-883 Class B screening. Specify the E variant for applications requiring frequent in-system updates such as flight data logging, mission parameter reconfiguration, or onboard calibration storage. Contact us to confirm stock and pricing for the E variant.
Sourcing AT28C256-20LM/883 for a defense or aerospace program? Sparkle Electronics stocks Atmel military EEPROM with full documentation support for QPL and MIL-STD-883 procurement workflows. Submit an inquiry — our team responds within 24 hours with pricing, stock confirmation, and lead time.
