ATMEL AT28HC256-90FM/883B (5962-88634 03 ZA)
- 256Kbit (32K × 8) high-speed parallel EEPROM with 90ns access time
- CMOS architecture with internal error correction for extended reliability
- 5V single-supply operation, hermetic 28-lead ceramic flatpack package
- MIL-STD-883 Class B screened for full military temperature range −55°C to +125°C
- DESC SMD 5962-88634 03 ZA — QPL-traceable for DLA defense procurement
Atmel (now Microchip Technology) developed the AT28HC256 as a high-speed CMOS evolution of the standard AT28C256 EEPROM family — designed specifically for defense and aerospace applications where 90ns access time is required without sacrificing the hermetic packaging and military screening that mission-critical embedded systems demand. The AT28HC256-90FM/883B is available from stock at Sparkle Electronics, a specialized distributor of military-grade and high-reliability electronic components serving defense prime contractors, avionics OEMs, and government procurement programs worldwide. The HC architecture integrates an internal error correction circuit in the military version, delivering enhanced endurance and improved data retention characteristics beyond what the standard AT28C256 family provides — a meaningful reliability advantage for programs with extended platform service life expectations.
The FM flatpack package positions the AT28HC256-90FM/883B for space-constrained defense assemblies where Cerdip or LCC packages cannot meet mechanical envelope requirements. At 90ns, this is the fastest access time available in the AT28HC256 military family, making it the correct specification for avionics flight computers, radar signal processors, missile guidance systems, and shipboard combat electronics where memory bus speed directly impacts system throughput. Procurable under DESC SMD number 5962-88634 03 ZA, the part carries full QPL traceability within the DLA qualified parts system. Note: the /883B suffix is functionally equivalent to /883 — the B designation reflects the MIL-STD-883 revision letter used at time of original release; all current production complies with the latest revision of MIL-STD-883. Contact Sparkle Electronics to confirm stock and request a same-day quote.
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DESC SMD Number: 5962-88634 03 ZA
The AT28HC256-90FM/883B is procurable under DESC Standard Military Drawing number 5962-88634 03 ZA, issued by the Defense Logistics Agency (DLA) Defense Electronics Supply Center. This SMD number identifies the part within the DLA Qualified Products List (QPL) system, establishing the regulatory traceability chain from procurement through system integration required by defense contracts subject to MIL-SPEC sourcing obligations.
For defense procurement teams sourcing 5962-88634 03 ZA stock or verifying QPL qualification status for avionics or missile electronics programs, the SMD number is the authoritative reference — not the commercial Atmel/Microchip part number alone. Sparkle Electronics supplies the AT28HC256-90FM/883B with supporting documentation including certificate of conformance, screening test records, and country of origin certification as required by DLA procurement workflows. Contact our team to discuss documentation requirements before placing your order.
AT28HC256-90FM/883B: 90ns High-Speed MIL-SPEC EEPROM — What Sets It Apart
The AT28HC256-90FM/883B occupies a specific and non-substitutable position in defense memory procurement: it is the fastest-access, hermetic-flatpack, MIL-STD-883 screened 256Kbit EEPROM in the Atmel military product line. Procurement engineers searching for AT28HC256-90FM/883B aerospace distributor, 5962-88634 03 ZA in stock, or 90ns MIL-STD-883 EEPROM flatpack will find Sparkle Electronics maintains ready inventory with same-day response capability. Submit an inquiry for pricing and stock confirmation within 24 hours.
HC vs. Standard AT28C256: Why the Architecture Difference Matters
The AT28HC256 is not simply a faster-clocked AT28C256. The HC designation reflects a CMOS process optimized for high-speed operation, and the military variant adds an internal error correction circuit absent in the standard AT28C256 family. This ECC capability extends effective write endurance and improves data retention under radiation and thermal stress — directly relevant for satellite, space vehicle, and high-radiation defense platform applications where bit errors from cosmic ray events or total ionizing dose accumulation are a system reliability concern.
AT28HC256-90FM/883B vs. Related Military EEPROM Options
| Parameter | AT28HC256-90FM/883B | AT28HC256-12FM/883 | AT28C256-15FM/883 |
|---|---|---|---|
| Manufacturer | Atmel / Microchip | Atmel / Microchip | Atmel / Microchip |
| Availability | In Stock at Sparkle | — | — |
| Architecture | High-Speed CMOS (HC) | High-Speed CMOS (HC) | Standard CMOS |
| Access Time | 90ns | 120ns | 150ns |
| Internal ECC | Yes (military) | Yes (military) | No |
| Package | 28-lead Ceramic Flatpack | 28-lead Ceramic Flatpack | 28-lead Ceramic Flatpack |
| Temperature Range | −55°C to +125°C | −55°C to +125°C | −55°C to +125°C |
| Active Current | 80mA max | 80mA max | 50mA max |
| Standby Current | 5mA max | 5mA max | 200µA max |
| Write Endurance | 10,000 cycles | 10,000 cycles | 10,000 cycles |
| Screening | MIL-STD-883 Class B | MIL-STD-883 Class B | MIL-STD-883 Class B |
| SMD Number | 5962-88634 03 ZA | 5962-88634 01 ZA | 5962-88525 06 ZA |
The HC family’s higher standby current (5mA vs. 200µA for standard AT28C256) is a design trade-off for achieving 90ns access speed and internal ECC. For power-budget-sensitive applications where standby current is a constraint, the standard AT28C256 family is the appropriate alternative. For throughput-critical applications where memory access latency directly impacts system performance, the AT28HC256-90FM/883B is the correct selection.
MIL-STD-883 Screening and QPL Traceability for Defense EEPROM Procurement
MIL-STD-883 Class B screening applied to the AT28HC256-90FM/883B includes 100% burn-in at elevated temperature, electrical characterization at −55°C and +125°C extremes, and hermetic seal verification — mandatory test procedures not applied to commercial or industrial-grade variants. The /883B suffix indicates the part was originally released under MIL-STD-883 Revision B nomenclature; current production is tested to the latest active revision of MIL-STD-883, making /883B and /883 functionally interchangeable for procurement purposes.
For programs sourcing under DLA procurement for QPL-qualified EEPROM or verifying MIL-STD-883 screening documentation for avionics or missile electronics qualification packages, Sparkle Electronics provides full conformance documentation on request. Contact our procurement team to confirm available documentation before order placement.
Within the Atmel military EEPROM family available from Sparkle Electronics, engineers requiring higher write endurance in a flatpack package should reference the ATMEL AT28C256E-15FM/883 — 100,000-cycle endurance under identical MIL-STD-883 Class B screening in the same 28-lead ceramic flatpack. For programs requiring 1Mbit density with hermetic ceramic DIP packaging, the ATMEL AT28C010-12DM/883 provides the density upgrade path with compatible parallel bus architecture.
Frequently Asked Questions
What does AT28HC256-90FM/883B decode to?
AT28 = Atmel EEPROM family; HC = high-speed CMOS architecture with internal error correction (military version); 256 = 256Kbit (262,144 bits); −90 = 90ns access time; F = 28-lead ceramic flatpack package; M = military temperature range (−55°C to +125°C); /883B = MIL-STD-883 Class B screening (B reflects original standard revision letter; equivalent to current /883 designation).
Where can I buy AT28HC256-90FM/883B in stock?
Sparkle Electronics maintains ready stock of the AT28HC256-90FM/883B for defense and aerospace procurement. Contact our team for current pricing, available quantity, and lead time confirmation. We supply defense prime contractors, government procurement offices, and aerospace systems integrators globally with same-day response on qualified inquiries.
What is the DESC SMD number for AT28HC256-90FM/883B?
5962-88634 03 ZA — the Defense Electronics Supply Center Standard Military Drawing number for the AT28HC256-90FM/883B, enabling full QPL traceability within the DLA defense procurement system. Sparkle Electronics provides conformance documentation upon request.
What is the difference between AT28HC256-90FM/883B and AT28HC256-90FM/883?
The /883B and /883 designations are functionally equivalent. The B suffix was appended when parts were originally released under MIL-STD-883 Revision B nomenclature. Current production of both part numbers complies with the latest active revision of MIL-STD-883. The parts are interchangeable for procurement and qualification purposes.
What is the internal error correction circuit in the military AT28HC256?
The military version of the AT28HC256 integrates an on-chip error correction circuit (ECC) that detects and corrects single-bit errors within stored data. This extends effective write endurance beyond the rated 10,000 cycles and improves data retention characteristics under thermal cycling and radiation exposure — a reliability advantage over the standard AT28C256 family, which does not include internal ECC.
Is AT28HC256-90FM/883B pin-compatible with the standard AT28C256 flatpack variants?
The AT28HC256 and AT28C256 share the same 256Kbit parallel EEPROM architecture and bus interface, but the HC series has a different current profile (80mA active, 5mA standby vs. 50mA active, 200µA standby). Pin assignments in the 28-lead flatpack are compatible, but system power budgets must account for the higher standby current before substituting between families. Contact us for application-specific cross-reference support.
Procuring AT28HC256-90FM/883B for an avionics or defense program? Sparkle Electronics stocks Atmel high-speed military EEPROM with full MIL-STD-883 and QPL documentation support for DLA procurement workflows. Submit an inquiry — same-day response on pricing, stock confirmation, and lead time.
