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AT28HC256E-12JI
Microchip Technology
IC EEPROM 256KBIT PAR 32PLCC
20220 Pcs New Original In Stock
EEPROM Memory IC 256Kbit Parallel 120 ns 32-PLCC (13.97x11.43)
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5.0 / 5.0
- (281 Ratings)
AT28HC256E-12JI
Product Overview
1266467
DiGi Electronics Part Number
AT28HC256E-12JI-DGManufacturer
Microchip Technology
AT28HC256E-12JI
Description
IC EEPROM 256KBIT PAR 32PLCCInventory
20220 Pcs New Original In Stock
EEPROM Memory IC 256Kbit Parallel 120 ns 32-PLCC (13.97x11.43)
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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AT28HC256E-12JI Technical Specifications
Category
Memory, Memory
Packaging
-
Series
-
Product Status
Obsolete
DiGi-Electronics Programmable
Not Verified
Memory Type
Non-Volatile
Memory Format
EEPROM
Technology
EEPROM
Memory Size
256Kbit
Memory Organization
32K x 8
Memory Interface
Parallel
Write Cycle Time - Word, Page
10ms
Access Time
120 ns
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
-40°C ~ 85°C (TC)
Mounting Type
Surface Mount
Package / Case
32-LCC (J-Lead)
Supplier Device Package
32-PLCC (13.97x11.43)
Base Product Number
AT28HC256
Datasheet & Documents
HTML Datasheet
AT28HC256E-12JI-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.32.0051
Additional Information
Other Names
AT28HC256E12JI
Standard Package
32
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
구매 후에도 지속적으로 도와주셔서 신뢰가 높아졌어요.
Dec 02, 2025
Je recommande vivement leur service pour leur rapidité et leur professionnalisme.
Dec 02, 2025
The after-sales team is knowledgeable and genuinely cares about customer satisfaction.
Dec 02, 2025
They have a very professional approach to fulfillment, ensuring that orders are shipped promptly and securely.
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Frequently Asked Questions (FAQ)
Can the AT28HC256E-12JI be safely used in high-reliability industrial applications given its obsolete status and RoHS non-compliance?
The AT28HC256E-12JI can still function reliably in industrial environments due to its rated -40°C to 85°C operating temperature and 10ms write cycle time, but its obsolete status and RoHS non-compliance introduce long-term supply chain and compliance risks. For high-reliability applications, consider lifetime buy strategies or qualified drop-in replacements like the RoHS-compliant X28HC256JIZ-15T1, which offers similar 256Kbit parallel EEPROM performance with improved environmental compliance. Always verify end-of-life support with Microchip and assess implications for product certification renewal.
What are the key design-in risks when replacing the AT28HC256E-12JI with the X28HC256JIZ-90T1 in an existing circuit?
Replacing the AT28HC256E-12JI with the X28HC256JIZ-90T1 introduces a slower 90ns access time (vs. 120ns) and potential differences in read/write timing margins, which may affect system timing in high-speed parallel bus designs. Additionally, verify voltage level compatibility and JEDEC pinout alignment to avoid integration issues. Use timing analysis on address, CE, and OE signals to ensure setup and hold times are maintained, especially in legacy systems operating near timing limits.
How does the 32-PLCC package of the AT28HC256E-12JI impact PCB layout and thermal performance in dense surface-mount assemblies?
The 32-PLCC (J-lead) package of the AT28HC256E-12JI requires careful attention to solder joint inspection due to lead undercut, and thermal pad design is absent, limiting heat dissipation. In high-density layouts, maintain adequate clearance for rework and consider via-in-pad risks under J-leads. Ensure proper stencil design for consistent solder paste deposition and validate reflow profiles to prevent tombstoning or head-in-pillow defects, especially given the MSL-2 sensitivity requiring controlled floor time.
Is the AT28HC256E-12JI suitable for battery-backed applications given its 4.5V to 5.5V supply requirement?
The AT28HC256E-12JI requires a stable 4.5V to 5.5V supply, making it incompatible with direct battery operation in typical 3.3V or lower battery systems. For battery-backed applications, use a regulated power rail or DC-DC booster to maintain voltage compliance, and confirm that power-up/down sequencing prevents unintended write cycles. Consider modern low-voltage serial EEPROMs like Microchip's 24AA256 for native battery-friendly operation unless parallel interface speed is critical.
What are the reliability concerns when using new original stock of the AT28HC256E-12JI from secondary suppliers after long-term storage?
New original AT28HC256E-12JI units from secondary suppliers may have been in storage for years, increasing risks of moisture ingress (despite MSL-2 1-year rating) or oxidation on J-leads. Before deployment, perform bake-out per J-STD-033 for moisture removal and verify functionality with full read/write endurance cycles. Check for date codes older than 5 years and consult reliability testing protocols for end-of-life components, including bond wire integrity and data retention under accelerated aging conditions.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
AT28HC256E-12JI CAD Models
Microchip Technology AT28HC256E-12JI PCB symbols & footprints
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