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93LC46A-I/MS
Microchip Technology
IC EEPROM 1KBIT MICROWIRE 8MSOP
2986 Pcs New Original In Stock
EEPROM Memory IC 1Kbit Microwire 2 MHz 8-MSOP
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93LC46A-I/MS
Product Overview
1236161
DiGi Electronics Part Number
93LC46A-I/MS-DGManufacturer
Microchip Technology
93LC46A-I/MS
Description
IC EEPROM 1KBIT MICROWIRE 8MSOPInventory
2986 Pcs New Original In Stock
EEPROM Memory IC 1Kbit Microwire 2 MHz 8-MSOP
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Quantity
Minimum 1
Minimum 1
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93LC46A-I/MS 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
1Kbit
Memory Organization
128 x 8
Memory Interface
Microwire
Clock Frequency
2 MHz
Write Cycle Time - Word, Page
6ms
Voltage - Supply
2.5V ~ 5.5V
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package
8-MSOP
Base Product Number
93LC46
Datasheet & Documents
HTML Datasheet
93LC46A-I/MS-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.32.0051
Additional Information
Other Names
93LC46A-I/MS-NDR
93LC46A-I/MSG-DG
93LC46A-I/MSG
93LC46A-I/MSR-DG
93LC46A-I/MSR
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
Affordable pricing paired with dedicated support makes DiGi Electronics a reliable choice.
de desembre 02, 2025
They prioritize customer satisfaction through quality products and supportive service.
de desembre 02, 2025
The shipping process is secure and punctual, reflecting their professionalism.
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Frequently Asked Questions (FAQ)
When replacing a 93LC46A-I/MS in an existing Microwire-based system, what are the critical compatibility risks if I consider using a SPI-based EEPROM like the 25LC010A instead?
Switching from the 93LC46A-I/MS (Microwire interface) to a SPI-based part like the Microchip 25LC010A introduces significant firmware and timing compatibility risks. While both are 1Kbit EEPROMs, Microwire uses a 3-wire synchronous serial protocol with specific start bits and opcode sequencing that differs fundamentally from SPI’s 4-wire MOSI/MISO/SCLK/CS structure. Your microcontroller must support both protocols or require a firmware rewrite, and signal timing margins may not map directly—especially at the 93LC46A-I/MS’s 2 MHz clock limit. Additionally, the 25LC010A has a different page write architecture and status register behavior, increasing integration risk in legacy designs without thorough validation.
Can I safely operate the 93LC46A-I/MS at its minimum 2.5V supply in a battery-powered design that occasionally dips to 2.3V under load, and what reliability issues might this cause?
Operating the 93LC46A-I/MS below its specified 2.5V minimum—even briefly—can lead to undervoltage-induced write failures or data corruption, especially during write cycles which already require up to 6ms. At 2.3V, internal charge pumps may not reliably generate the high voltage needed for EEPROM cell programming, increasing the risk of partial or failed writes that aren’t immediately detectable. To mitigate this, implement a brown-out detection circuit or use a supervisor IC to disable writes when VCC falls below 2.5V, or consider a more robust alternative like the 93LC46B-I/MS (which shares the same pinout but offers improved low-voltage margin in some variants).
Is the 93LC46A-I/MS suitable for automotive under-hood applications where ambient temperatures can exceed 105°C, despite its rated -40°C to 85°C operating range?
No, the 93LC46A-I/MS is not suitable for sustained operation above 85°C, as it exceeds its specified operating temperature range (TA = -40°C to 85°C). Prolonged exposure to 105°C can accelerate data retention degradation, increase bit error rates, and reduce overall lifespan due to oxide wear in the EEPROM cells. For automotive under-hood use, select an AEC-Q100 qualified alternative such as the Microchip 93LC46C-I/MS (if available in a compatible temp range) or migrate to an industrial-grade SPI EEPROM like the M95M01-DR, which supports -40°C to 125°C and offers similar density with higher thermal robustness.
What design constraints should I consider when routing the Microwire signals (CS, SK, DI, DO) for the 93LC46A-I/MS on a dense 2-layer PCB to avoid timing violations at 2 MHz?
At 2 MHz, the 93LC46A-I/MS requires careful signal integrity management on a 2-layer board. Keep Microwire traces (CS, SK, DI, DO) as short and direct as possible, with matched lengths to minimize skew—especially between SK (clock) and DI (data in). Avoid routing under noisy components or parallel to high-speed digital lines to prevent crosstalk. Use ground fills adjacent to these traces and ensure a solid ground return path beneath them. Since the 8-MSOP package has limited thermal and EMI shielding, adding small series termination resistors (22–33Ω) near the MCU can dampen reflections and improve signal fidelity without significantly impacting rise times.
If I'm upgrading from an older 93LC46A-I/MS design and want higher endurance or faster write cycles, would the 93AA46A or 93LC46B be drop-in replacements, and what trade-offs should I expect?
The 93AA46A (16-bit organization) is not a drop-in replacement for the 93LC46A-I/MS due to its different memory organization (64 x 16 vs. 128 x 8), which breaks backward compatibility with byte-oriented firmware. The 93LC46B-I/MS, however, is functionally compatible and offers improved write endurance (up to 1 million cycles vs. 100k typical on the 'A' version) and slightly faster write times under optimal conditions. It shares the same 8-MSOP package, voltage range, and Microwire interface, making it a safer upgrade path. However, verify that your system’s write cycle timing accounts for potential differences in internal algorithm execution, and always validate data retention under your specific environmental conditions before full deployment.
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93LC46A-I/MS CAD Models
Microchip Technology 93LC46A-I/MS PCB symbols & footprints
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