FT93C46A-ITR-T EEPROM 1Kbit 3-Wire Serial Memory - Equivalent & Substitute Parts

Part Overview

The FT93C46A-ITR-T is a 1Kbit EEPROM memory IC with 3-Wire Serial interface, manufactured by Fremont Micro Devices Ltd in 8-TSSOP surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a wide supply voltage range of 1.8V to 5.5V with a 2 MHz clock frequency and 10ms write cycle time, serving applications requiring non-volatile serial memory storage.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	3-Wire Serial
Clock Frequency	2 MHz
Write Cycle Time	10ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the FT93C46A-ITR-T is determined by the following critical parameters: memory size (1Kbit), memory organization (128 x 8 or 64 x 16), package type (8-TSSOP), mounting type (surface mount), and interface protocol compatibility. The substitute parts are grouped into two categories:

Direct Substitutes (Same Interface Protocol - 3-Wire Serial):

FT93C46A-UTR-T: Same manufacturer, same base product number, identical package and memory specifications. Differs in clock frequency (1 MHz vs 2 MHz) and supply voltage range (4.5V ~ 5.5V vs 1.8V ~ 5.5V).
AT93C46D-TH-B and AT93C46D-TH-T: Microchip Technology equivalents with identical memory specifications, 3-Wire Serial interface, 2 MHz clock frequency, and 8-TSSOP package. Offer improved write cycle time (5ms vs 10ms) and verified programmability.

Similar Substitutes (Compatible Interface Protocol - Microwire):

M93C46-RDW3TP/K and M93C46-WDW6TP: STMicroelectronics parts with Microwire interface (protocol-compatible with 3-Wire Serial for this memory class), identical memory size and organization, 2 MHz clock frequency, and 8-TSSOP package. M93C46-RDW3TP/K includes automotive qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temp	Package	Product Status
FT93C46A-ITR-T	Fremont Micro Devices Ltd	1Kbit	3-Wire Serial	2 MHz	10ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Discontinued
FT93C46A-UTR-T	Fremont Micro Devices Ltd	1Kbit	3-Wire Serial	1 MHz	10ms	4.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT93C46D-TH-B	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT93C46D-TH-T	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M93C46-RDW3TP/K	STMicroelectronics	1Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M93C46-WDW6TP	STMicroelectronics	1Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement: Select AT93C46D-TH-T or AT93C46D-TH-B from Microchip Technology. Both parts maintain the 3-Wire Serial interface, 1Kbit memory capacity, and 8-TSSOP package of the original FT93C46A-ITR-T. These parts are active products with verified programmability, ROHS3 compliance, and improved write cycle time (5ms vs 10ms). AT93C46D-TH-T is available in Cut Tape and Digi-Reel packaging, while AT93C46D-TH-B is supplied in Tube packaging.

For Extended Temperature or Automotive Applications: Select M93C46-RDW3TP/K from STMicroelectronics. This part provides AEC-Q100 automotive qualification and extended operating temperature range (-40°C ~ 125°C). The Microwire interface is protocol-compatible with 3-Wire Serial for this memory class. Verify interface compatibility with your application firmware before selection.

For High-Volume Availability: Select M93C46-WDW6TP from STMicroelectronics. This part offers the highest inventory availability (57,700 pcs) with verified programmability, active product status, and Cut Tape/Digi-Reel packaging. Supply voltage range is 2.5V ~ 5.5V, suitable for most standard applications.

For Backward Compatibility with Reduced Clock Frequency: Select FT93C46A-UTR-T from Fremont Micro Devices Ltd. This part maintains the same manufacturer and base product number with identical memory specifications. Clock frequency is reduced to 1 MHz and supply voltage range is narrowed to 4.5V ~ 5.5V. Use only if your application can operate at 1 MHz clock frequency and 4.5V minimum supply voltage.

Frequently Asked Questions (FAQ)

Q: Can I use AT93C46D parts as direct replacements for FT93C46A-ITR-T? A: Yes. Both AT93C46D-TH-T and AT93C46D-TH-B are direct substitutes. They maintain identical memory size (1Kbit), memory organization (128 x 8, 64 x 16), 3-Wire Serial interface, 8-TSSOP package, and supply voltage range (1.8V ~ 5.5V). The AT93C46D series offers improved write cycle time (5ms vs 10ms) and verified programmability.

Q: What is the difference between 3-Wire Serial and Microwire interfaces? A: Both protocols are serial communication standards for EEPROM memory. For 1Kbit memory devices in this product class, Microwire and 3-Wire Serial are protocol-compatible at the functional level. Verify your application firmware supports Microwire protocol before selecting M93C46 parts.

Q: Why does FT93C46A-UTR-T have a lower clock frequency (1 MHz vs 2 MHz)? A: The FT93C46A-UTR-T is a variant optimized for narrower supply voltage range (4.5V ~ 5.5V). The reduced clock frequency reflects different electrical characteristics. Use this part only if your application operates within the 4.5V ~ 5.5V supply range and can function at 1 MHz clock frequency.

Q: Which substitute part has the best availability? A: M93C46-WDW6TP from STMicroelectronics has the highest inventory (57,700 pcs). This part is active, verified for programmability, and available in Cut Tape and Digi-Reel packaging suitable for production environments.

Q: Can I use M93C46-RDW3TP/K in non-automotive applications? A: Yes. M93C46-RDW3TP/K is AEC-Q100 qualified but not restricted to automotive use. It is suitable for any application requiring 1Kbit EEPROM memory with Microwire interface, extended temperature range (-40°C ~ 125°C), and 8-TSSOP package.

Q: What is the packaging difference between Cut Tape (CT), Tube, and Tape & Reel (TR)? A: Cut Tape and Digi-Reel are suitable for both manual and automated assembly with standard pick-and-place equipment. Tube packaging is used for manual assembly or lower-volume production. Tape & Reel is optimized for high-volume automated assembly. Select packaging based on your production process and volume requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (FT93C46A-UTR-T, AT93C46D-TH-B, AT93C46D-TH-T, M93C46-RDW3TP/K, M93C46-WDW6TP) are ROHS3 compliant and REACH unaffected.

Q: What is the minimum supply voltage for each substitute part? A: FT93C46A-ITR-T and AT93C46D variants: 1.8V minimum. M93C46-RDW3TP/K: 1.8V minimum. M93C46-WDW6TP: 2.5V minimum. FT93C46A-UTR-T: 4.5V minimum. Verify your application supply voltage against the selected part's minimum specification.

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