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AT28C256-15PI
Microchip Technology
IC EEPROM 256KBIT PARALLEL 28DIP
1721 Pcs New Original In Stock
EEPROM Memory IC 256Kbit Parallel 150 ns 28-PDIP
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5.0 / 5.0
- (175 Ratings)
AT28C256-15PI
Product Overview
1288435
DiGi Electronics Part Number
AT28C256-15PI-DGManufacturer
Microchip Technology
AT28C256-15PI
Description
IC EEPROM 256KBIT PARALLEL 28DIPInventory
1721 Pcs New Original In Stock
EEPROM Memory IC 256Kbit Parallel 150 ns 28-PDIP
Quantity
Minimum 1
Minimum 1
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AT28C256-15PI 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
150 ns
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
-40°C ~ 85°C (TC)
Mounting Type
Through Hole
Package / Case
28-DIP (0.600", 15.24mm)
Supplier Device Package
28-PDIP
Base Product Number
AT28C256
Datasheet & Documents
HTML Datasheet
AT28C256-15PI-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.32.0051
Additional Information
Standard Package
14
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
고객 지원이 뛰어나고, 제품의 품질이 뛰어나서 앞으로도 계속 이용할 의사 있습니다.
de desembre 02, 2025
배송이 빠르고 꼼꼼하게 포장되어 있어 기분 좋게 쇼핑했어요.
de desembre 02, 2025
他們的運送速度一直很快，幾乎沒有延遲，讓我感到非常滿意。
de desembre 02, 2025
The cost savings from purchasing in bulk here are truly remarkable.
de desembre 02, 2025
I appreciate their consistent punctuality and secure packaging practices.
de desembre 02, 2025
The support staff's patience and expertise make every post-sales interaction positive.
de desembre 02, 2025
The shipping process is smooth, with minimal delays, and their support helps troubleshoot issues effectively.
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Frequently Asked Questions (FAQ)
Can the AT28C256-15PI be safely used as a drop-in replacement for a 27C256 EPROM in an existing 5V legacy system design?
The AT28C256-15PI can function as a functional replacement for the 27C256 in many 5V systems due to its compatible 28-DIP footprint, parallel interface, and 32K x 8 organization. However, unlike UV-erasable EPROMs, this EEPROM allows in-circuit reprogramming, which introduces a critical design risk: accidental overwrites during power-up or noisy bus conditions. You must ensure the /WE (Write Enable) pin is properly pulled high or controlled by a dedicated write-protect circuit to prevent unintended writes. Additionally, verify that your system’s timing margins support the 150 ns access time, as some older designs assumed slower EPROM timings. Always validate behavior under full operating temperature range (-40°C to 85°C) before deployment.
What are the key reliability risks when designing with the AT28C256-15PI in industrial environments, and how can they be mitigated?
Although the AT28C256-15PI is rated for -40°C to 85°C operation, its reliability in industrial settings is constrained by its non-RoHS, tin-lead finish and through-hole packaging, which may be prone to mechanical stress in high-vibration environments. Additionally, EEPROMs like this have a limited write endurance (typically 10^6 cycles), so frequent reprogramming in field-updatable applications can lead to premature failure. To mitigate risk, implement software write throttling, use external wear-leveling if updating frequently, and consider conformal coating to protect against moisture and contaminants. Also, avoid using it in safety-critical systems without redundancy, as it lacks built-in ECC or fault detection features common in modern memory.
Is the AT28C256-15PI electrically compatible with the newer AT28C256-15PU, and can they be interchanged without PCB modifications?
The AT28C256-15PI (28-PDIP, through-hole) and AT28C256-15PU (28-PDIP, but with updated packaging and potentially different lead finish) share identical pinouts, timing characteristics, and electrical specs, making them functionally interchangeable in most cases. However, the '-PI' suffix typically denotes an industrial temperature grade with a wider operating range, while the '-PU' may have subtle manufacturing differences. Since the AT28C256-15PI is now obsolete, the -15PU is the recommended active substitute. Before swapping, confirm mechanical fit—especially if automated insertion is used—and verify that your solder profile accommodates any differences in thermal mass or lead composition. Always cross-check the latest Microchip datasheet for both parts to ensure no silent errata apply.
How should I handle power sequencing and brownout conditions when integrating the AT28C256-15PI into a microcontroller-based design?
The AT28C256-15PI requires stable 4.5V to 5.5V supply during both read and write operations. A critical but often overlooked risk is data corruption during brownouts or improper power-down sequences. If VCC drops below 4.5V during a write cycle, the device may enter an undefined state, corrupting the target memory location. To prevent this, implement a supervisory circuit (e.g., Microchip’s MCP101 or similar) to hold the microcontroller in reset and disable writes (/WE high) during voltage sags. Additionally, ensure your firmware includes a write-verification routine and avoids initiating writes during unstable power conditions. This is especially important in automotive or remote industrial systems where supply transients are common.
What design constraints should I consider if replacing the AT28C256-15PI with a modern SPI EEPROM like the 25LC256 in a space-constrained or low-power application?
While the 25LC256 (Microchip’s 256Kb SPI EEPROM) offers lower power consumption, smaller SOIC-8 footprint, and daisy-chain capability, it is not a direct replacement for the AT28C256-15PI due to fundamental interface differences—parallel vs. serial. Migrating requires significant firmware changes, additional GPIOs for SPI control, and potential CPU overhead for bit-banging if no hardware SPI is available. Moreover, the 25LC256 has a slower effective throughput for random access despite faster clock rates. If board space or power is critical, this trade-off may be justified, but for systems requiring fast byte-level access or minimal CPU intervention, sticking with a parallel EEPROM (or redesigning around a modern parallel alternative like the AT28C256B series) may be preferable. Always assess total system latency and software complexity before committing to an interface migration.
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AT28C256-15PI CAD Models
Microchip Technology AT28C256-15PI PCB symbols & footprints
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