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25LC256-I/ST
Microchip Technology
IC EEPROM 256KBIT SPI 8TSSOP
3275 Pcs New Original In Stock
EEPROM Memory IC 256Kbit SPI 10 MHz 8-TSSOP
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5.0 / 5.0
- (366 Ratings)
25LC256-I/ST
Product Overview
1237823
DiGi Electronics Part Number
25LC256-I/ST-DGManufacturer
Microchip Technology
25LC256-I/ST
Description
IC EEPROM 256KBIT SPI 8TSSOPInventory
3275 Pcs New Original In Stock
EEPROM Memory IC 256Kbit SPI 10 MHz 8-TSSOP
Quantity
Minimum 1
Minimum 1
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25LC256-I/ST Technical Specifications
Category
Memory, Memory
Packaging
Tube
Series
-
Product Status
Active
DiGi-Electronics Programmable
Not Verified
Memory Type
Non-Volatile
Memory Format
EEPROM
Technology
EEPROM
Memory Size
256Kbit
Memory Organization
32K x 8
Memory Interface
SPI
Clock Frequency
10 MHz
Write Cycle Time - Word, Page
5ms
Voltage - Supply
2.5V ~ 5.5V
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
8-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
8-TSSOP
Base Product Number
25LC256
Datasheet & Documents
HTML Datasheet
25LC256-I/ST-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.32.0051
Additional Information
Other Names
25LC256IST
Standard Package
100
Alternative Parts
PART 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
Their after-sales service demonstrates genuine concern for customer satisfaction.
de desembre 02, 2025
Whenever I've needed assistance, DiGi’s support team has been swift and knowledgeable, resolving my issues efficiently.
de desembre 02, 2025
DiGi Electronics offers clear and upfront pricing, so I know exactly what I'm paying for.
de desembre 02, 2025
Customer support from DiGi Electronics is quick, helpful, and always professional.
de desembre 02, 2025
Smooth and rapid shipping process, complemented by a product that feels very high-end.
de desembre 02, 2025
Parcel was shipped quickly and wrapped meticulously for safe delivery.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the 25LC256-I/ST in a low-power SPI application with intermittent power supply?
A major design-in risk with the 25LC256-I/ST in low-power or intermittently powered systems is incomplete write cycles leading to data corruption. Since the 25LC256-I/ST has a maximum write cycle time of 5ms, an unexpected power loss during this window can corrupt the current page write. To mitigate this, ensure your system either includes a backup energy source (e.g., a small capacitor) to sustain VCC for at least 5ms post-interruption or implements robust write-status checking via the Status Register (using RDSR command) before assuming data is committed. Additionally, minimize unnecessary writes and use page write alignment to reduce exposure time.
Can the 25LC256-I/ST reliably replace the AT25256B-10SU-2.7 in an industrial temperature design, and what compatibility issues should be checked?
Yes, the 25LC256-I/ST can reliably replace the AT25256B-10SU-2.7 in most industrial applications, given both are 256Kbit SPI EEPROMs with similar 10 MHz clock ratings and 2.5V–5.5V supply ranges. However, verify SPI mode compatibility—the 25LC256-I/ST operates in SPI Mode 0 (CPOL=0, CPHA=0) by default. Ensure the AT25256B replacement path doesn’t assume Mode 3. Also, check timing tolerances: the 25LC256-I/ST specifies t_{WC} = 5ms max for writes, compared to the AT25256B’s 5ms typical—design your firmware to poll the BUSY bit in the status register rather than relying on fixed delays. Finally, confirm package pinout compatibility (both are 8-TSSOP), especially for HOLD and WP functions.
How does supply voltage noise affect write endurance in the 25LC256-I/ST, and what PCB layout practices should be followed to maximize reliability?
Supply voltage noise near the lower operating limit (2.5V) can trigger incomplete write cycles in the 25LC256-I/ST, accelerating wear on specific memory pages and reducing effective endurance below the rated 1 million cycles. To ensure reliability, use a clean, regulated supply with a local 0.1 µF ceramic bypass capacitor placed within 5mm of the VCC pin. Avoid routing noisy digital lines (e.g., clock or data lines) parallel to VCC traces. In industrial environments, consider adding a ferrite bead and larger bulk capacitor (1–10µF) to filter low-frequency ripple. Enable the 25LC256-I/ST’s Write Protect (WP) pin when not actively writing to prevent accidental writes during supply transients.
What are the implications of exceeding the 10 MHz SPI clock limit on the 25LC256-I/ST, and how should timing margins be managed in high-noise environments?
Operating the SPI clock above 10 MHz on the 25LC256-I/ST violates timing specifications and risks data corruption during reads or writes due to insufficient setup and hold times. In high-noise environments, even marginally compliant signals (e.g., 9–10 MHz) may fail due to jitter or ringing. To protect data integrity, derate the clock to 8 MHz in electrically noisy systems, and use series termination resistors (22–47 Ω) close to the driver. Ensure SCK, SI, and CS signals are routed with controlled impedance and minimal stubs. Always verify timing margins using the datasheet’s AC specifications—particularly t_{SU} and t_{HOLD}—and avoid overclocking even if short bench tests appear to work.
When integrating the 25LC256-I/ST in a high-density PCB with multiple SPI devices, what are the recommended practices to prevent bus contention and signal degradation?
When integrating the 25LC256-I/ST in a multi-SPI device system, bus contention and signal degradation can occur due to excessive capacitive loading or improper slave selection. Limit the number of SPI devices on the same bus to reduce cumulative capacitance below 50 pF; add series resistors (10–33 Ω) on SCK and data lines if needed. Ensure each device, including the 25LC256-I/ST, has a dedicated chip select (CS) line pulled high with a 10 kΩ resistor to avoid floating. Use daisy-chain topology sparingly—prefer point-to-point routing. Enable the 25LC256-I/ST’s HOLD feature (via the HOLD pin) if pausing communication mid-operation is required. Finally, terminate long traces and avoid crossing over noisy power domains to maintain signal integrity.
Quality Assurance (QC)
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25LC256-I/ST CAD Models
Microchip Technology 25LC256-I/ST PCB symbols & footprints
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