ATMEL AT28HC256-90LM/883 (5962-88634 03 YA)
- 256Kbit (32K × 8) high-speed CMOS parallel EEPROM with 90ns access time
- Internal error correction circuit for enhanced endurance and data retention
- Hermetic 32-pad ceramic LCC package — surface-mount compatible for dense defense PCBs
- MIL-STD-883 Class B screened across full military range −55°C to +125°C
- DESC SMD 5962-88634 03 YA — QPL-traceable for DLA defense procurement
Atmel (now Microchip Technology) introduced the AT28HC256 as a high-speed CMOS advancement over the standard AT28C256 EEPROM family, engineered for defense and aerospace applications requiring 90ns memory access without compromising the hermetic packaging and military screening that mission-critical systems demand. The AT28HC256-90LM/883 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 military version of the HC architecture includes an on-chip error correction circuit — a reliability feature absent from the standard AT28C256 family — which extends effective endurance and improves data retention under thermal cycling and radiation exposure conditions common to airborne and space defense platforms.
The LM package — a 32-pad hermetic ceramic LCC — distinguishes the AT28HC256-90LM/883 from its Cerdip and flatpack counterparts by offering a surface-mount-compatible hermetic footprint suited to high-density defense PCB assemblies where through-hole packages are not compatible with modern board manufacturing processes. At 90ns access time, this is the fastest-access LCC-packaged MIL-STD-883 screened EEPROM in the AT28HC256 family, making it the correct specification for avionics flight management computers, radar signal processors, and shipboard combat electronics where both PCB density and memory throughput are design constraints. Procurable under DESC SMD number 5962-88634 03 YA, the part carries full QPL traceability within the DLA qualified parts system. Contact Sparkle Electronics to confirm stock availability and request a same-day quote.
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DESC SMD Number: 5962-88634 03 YA
The AT28HC256-90LM/883 is procurable under DESC Standard Military Drawing number 5962-88634 03 YA, issued by the Defense Logistics Agency (DLA) Defense Electronics Supply Center. This SMD number places the part within the DLA Qualified Products List (QPL) system, providing the regulatory traceability chain required by defense contracts subject to MIL-SPEC sourcing obligations — from initial procurement through system integration and platform fielding.
For programs sourcing 5962-88634 03 YA stock or verifying QPL qualification for avionics, missile electronics, or shipboard system memory procurement, the SMD number is the authoritative procurement reference alongside the commercial part number. Sparkle Electronics supplies the AT28HC256-90LM/883 with certificate of conformance, MIL-STD-883 screening test records, and country of origin documentation as required by defense procurement workflows. Contact our team to discuss documentation requirements before placing your order.
AT28HC256-90LM/883: The Case for Hermetic LCC in High-Speed Military EEPROM Selection
Defense PCB designers evaluating 90ns MIL-STD-883 screened EEPROM face a package decision that directly affects both board layout and long-term platform reliability. The AT28HC256-90LM/883 addresses the specific intersection of requirements where through-hole Cerdip packages are mechanically incompatible with modern SMT assembly processes, but plastic LCC packages are disqualified by hermetic sealing requirements. Procurement engineers searching for AT28HC256-90LM/883 in stock, 5962-88634 03 YA aerospace distributor, or 90ns hermetic LCC EEPROM MIL-STD-883 will find Sparkle Electronics maintains ready inventory with same-day response. Submit an inquiry for pricing and stock confirmation within 24 hours.
Why the 32-Pad Ceramic LCC Package Is the Right Choice for Dense Military Boards
The 32L ceramic LCC provides hermetic sealing equivalent to Cerdip and flatpack packages while offering a leadless surface-mount footprint that Cerdip through-hole packages cannot match on modern high-density defense PCBs. For avionics line-replaceable units (LRUs) and missile electronics assemblies designed to surface-mount manufacturing processes, the AT28HC256-90LM/883 is often the only MIL-STD-883 screened 90ns EEPROM that satisfies both the hermetic sealing requirement and the SMT assembly constraint simultaneously. The ceramic construction undergoes MIL-STD-883 hermeticity verification as part of Class B screening — confirming seal integrity before shipment.
AT28HC256-90LM/883 vs. Related Military EEPROM Packages
| Parameter | AT28HC256-90LM/883 | AT28HC256-90FM/883B | AT28HC256-90DM/883 |
|---|---|---|---|
| Manufacturer | Atmel / Microchip | Atmel / Microchip | Atmel / Microchip |
| Availability | In Stock at Sparkle | In Stock at Sparkle | — |
| Package | 32-pad Ceramic LCC | 28-lead Ceramic Flatpack | 28-lead Cerdip |
| Assembly Type | Surface-mount (SMT) | Surface-mount (SMT) | Through-hole |
| Access Time | 90ns | 90ns | 90ns |
| Internal ECC | Yes (military) | Yes (military) | Yes (military) |
| Active Current | 80mA max | 80mA max | 80mA max |
| Standby Current | 5mA max | 5mA max | 5mA max |
| Temperature Range | −55°C to +125°C | −55°C to +125°C | −55°C to +125°C |
| Screening | MIL-STD-883 Class B | MIL-STD-883 Class B | MIL-STD-883 Class B |
| SMD Number | 5962-88634 03 YA | 5962-88634 03 ZA | 5962-88634 03 XA |
All three packages deliver identical electrical performance — the selection between them is driven entirely by PCB design constraints. Through-hole boards with sufficient height clearance use the Cerdip. Space-constrained SMT boards with tight height budgets use the flatpack. Standard-height SMT boards use the LCC. All three carry the same DESC SMD family number 5962-88634 with package-specific suffix.
HC Architecture, Internal ECC, and MIL-STD-883 Class B Screening
The AT28HC256 military family’s internal error correction circuit distinguishes it from the standard AT28C256 family in defense applications subject to radiation or long thermal cycling exposure. The ECC detects and corrects single-bit errors within stored data autonomously — without host processor intervention — improving effective data retention and endurance characteristics beyond the rated 10,000 write cycles. For satellite applications, space vehicle onboard computers, and high-radiation ground-based defense electronics, the presence of on-chip ECC is a meaningful reliability differentiator when selecting between the AT28C256 and AT28HC256 families.
MIL-STD-883 Class B screening for the AT28HC256-90LM/883 includes 100% burn-in at elevated temperature, full electrical characterization at both −55°C and +125°C, and hermetic seal verification. For DLA procurement under QPL traceability requirements or program offices requiring MIL-STD-883 screening documentation for avionics or missile electronics qualification packages, Sparkle Electronics provides full conformance documentation on request.
Within the Atmel military EEPROM family available from Sparkle Electronics, the ATMEL AT28HC256-90FM/883B offers the same 90ns performance in a hermetic ceramic flatpack for applications with more restrictive height constraints. For programs where higher write endurance is the primary selection criterion over access speed, the ATMEL AT28C256E-15FM/883 provides 100,000-cycle endurance in a ceramic flatpack under equivalent MIL-STD-883 Class B screening. For 1Mbit density requirements in hermetic ceramic DIP packaging, the ATMEL AT28C010-12DM/883 offers the density upgrade path with a compatible parallel bus interface.
Frequently Asked Questions
What does AT28HC256-90LM/883 decode to?
AT28 = Atmel EEPROM family; HC = high-speed CMOS with internal error correction (military version); 256 = 256Kbit (262,144 bits); −90 = 90ns 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 AT28HC256-90LM/883 in stock?
Sparkle Electronics maintains ready stock of the AT28HC256-90LM/883 for defense and aerospace procurement. 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 with same-day response on qualified inquiries.
What is the DESC SMD number for AT28HC256-90LM/883?
5962-88634 03 YA — the Defense Electronics Supply Center Standard Military Drawing number for the AT28HC256-90LM/883, enabling full QPL traceability within the DLA defense procurement system. Certificate of conformance and screening documentation available upon request.
What is the difference between the AT28HC256 and the standard AT28C256?
The HC designation indicates a high-speed CMOS architecture optimized for 90ns access time, versus 150ns minimum for the standard AT28C256 military family. The military version of the AT28HC256 additionally integrates an on-chip error correction circuit not present in the AT28C256 family. The trade-off is higher standby current: 5mA for the HC family versus 200µA for the standard family. For power-budget-sensitive applications, the standard AT28C256 is appropriate; for throughput-critical or radiation-exposed applications, the AT28HC256 is the correct selection.
Why does the ceramic LCC package matter for modern defense PCB designs?
The 32-pad ceramic LCC provides MIL-STD-883 validated hermetic sealing in a surface-mount-compatible leadless footprint. Unlike the Cerdip which requires through-hole assembly, the LCC can be placed and reflowed using standard SMT processes — enabling its use on modern high-density defense PCBs where through-hole components are excluded from the design. This makes the AT28HC256-90LM/883 the preferred package for avionics LRUs and missile electronics boards where both hermeticity and SMT assembly compatibility are mandatory requirements.
Is AT28HC256-90LM/883 pin-compatible with the standard AT28C256 LCC variants?
The AT28HC256 and AT28C256 LCC packages share the same 32-pad ceramic LCC footprint and parallel bus interface, but the HC series draws significantly higher standby current (5mA vs. 200µA). System power budgets must be evaluated before substituting between families. Board-level redesign is not required, but power supply sizing and decoupling must account for the HC family’s current profile. Contact us for application-specific cross-reference and substitution support.
Procuring AT28HC256-90LM/883 for an avionics or defense SMT program? Sparkle Electronics stocks Atmel high-speed military EEPROM in hermetic ceramic LCC packaging 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.
