93C46BT/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46BT/ST is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This device is packaged in 8-TSSOP surface mount configuration and is actively supported by the manufacturer. Substitute parts may be required due to inventory constraints, packaging preferences, extended operating temperature ranges, or supply chain optimization while maintaining functional and electrical compatibility.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Package Type	8-TSSOP / 8-SSOP-B
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 93C46BT/ST are qualified based on the following criteria:

Mandatory Compatibility Parameters:

Memory Size: 1Kbit (64 x 16 organization)
Memory Interface: Microwire protocol
Clock Frequency: 2 MHz
Package Type: 8-TSSOP or 8-SSOP-B (0.173" width, 4.40mm)
Mounting Type: Surface Mount
RoHS3 Compliance

Variable Parameters Allowing Substitution:

Voltage Supply Range (93C46BT/ST: 4.5V–5.5V; substitutes may support wider ranges)
Operating Temperature Range (93C46BT/ST: 0°C–70°C; substitutes may support extended ranges)
Write Cycle Time (93C46BT/ST: 2ms; substitutes may vary)
Manufacturer (Microchip Technology or equivalent qualified manufacturers)
Product Status (Active or Not For New Designs)
Packaging Format (Tape & Reel or Cut Tape)

Parameter Comparison

Parameter	93C46BT/ST	93LC46BT-I/ST	BR93L46RFV-WE2
Manufacturer	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	64 x 16
Memory Interface	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz
Package / Case	8-TSSOP (0.173", 4.40mm)	8-TSSOP (0.173", 4.40mm)	8-LSSOP (0.173", 4.40mm)
Voltage Supply Range	4.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Write Cycle Time	2ms	6ms	5ms
Product Status	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

93LC46BT-I/ST (Microchip Technology)

This part is the primary substitute for the 93C46BT/ST. Both devices are manufactured by Microchip Technology and maintain identical memory specifications, interface protocol, and package dimensions. The 93LC46BT-I/ST offers extended voltage supply range (2.5V–5.5V) and wider operating temperature range (-40°C–85°C), making it suitable for applications requiring broader environmental tolerance. Write cycle time is 6ms compared to 2ms for the main part. Product status is Active, ensuring continued manufacturer support and availability.

BR93L46RFV-WE2 (Rohm Semiconductor)

This part provides functional equivalence with identical memory capacity, organization, and Microwire interface at 2 MHz. The BR93L46RFV-WE2 supports the widest voltage supply range (1.8V–5.5V) and extended operating temperature range (-40°C–85°C). Package designation is 8-SSOP-B, which maintains mechanical compatibility with 0.173" width and 4.40mm dimensions. Product status is Not For New Designs, indicating this part is suitable for legacy system support and maintenance applications only. Write cycle time is 5ms.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46BT-I/ST directly replace the 93C46BT/ST in existing designs?

A: Yes. Both parts share identical memory capacity (1Kbit), organization (64 x 16), Microwire interface, 2 MHz clock frequency, and 8-TSSOP package dimensions. The 93LC46BT-I/ST supports a wider voltage range and extended temperature range, making it functionally compatible. Write cycle time differs (6ms vs. 2ms), which must be evaluated against application timing requirements.

Q: What is the difference between 8-TSSOP and 8-SSOP-B packaging?

A: Both package types maintain the same 0.173" width and 4.40mm overall dimensions, ensuring mechanical compatibility on PCB layouts. The designations reflect different manufacturer package specifications. Footprint compatibility should be verified with component datasheets for specific pin pitch and lead geometry.

Q: Is the BR93L46RFV-WE2 suitable for new product designs?

A: No. The BR93L46RFV-WE2 carries a "Not For New Designs" status, indicating the manufacturer is not actively supporting this part for new applications. It is appropriate for legacy system maintenance and replacement scenarios only. For new designs, use the 93C46BT/ST or 93LC46BT-I/ST.

Q: What are the voltage supply compatibility considerations?

A: The 93C46BT/ST operates within 4.5V–5.5V. The 93LC46BT-I/ST extends this to 2.5V–5.5V, and the BR93L46RFV-WE2 supports 1.8V–5.5V. Substitution is valid only when the application supply voltage falls within the substitute part's specified range. Designs operating at voltages below 4.5V require the 93LC46BT-I/ST or BR93L46RFV-WE2.

Q: How do write cycle time differences affect substitution?

A: The 93C46BT/ST specifies 2ms write cycle time, while substitutes specify 6ms (93LC46BT-I/ST) or 5ms (BR93L46RFV-WE2). Applications with strict write timing requirements must account for these differences. Longer write cycles may impact system performance in time-critical operations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 93C46BT/ST, 93LC46BT-I/ST, and BR93L46RFV-WE2 are all ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), meeting environmental and regulatory requirements for commercial and industrial applications.

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