93C46BT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46BT-I/ST is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 2 MHz clock frequency. This non-volatile memory device is packaged in 8-TSSOP surface mount configuration and operates across industrial temperature range (-40°C to 85°C). The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the original part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications permit operation across extended voltage or temperature ranges supported by equivalent alternatives.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
Write Cycle Time	2ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46BT-I/ST is determined by the following critical parameters: memory capacity (1Kbit), memory organization (64 x 16), serial interface protocol (Microwire), clock frequency (2 MHz), and physical package footprint (8-TSSOP). Parts meeting these core specifications are functionally interchangeable at the circuit level.

Secondary parameters including voltage supply range, write cycle time, operating temperature range, and packaging format (Tape & Reel, Cut Tape, or Tube) define the scope of direct substitution. Parts with extended voltage ranges or wider temperature specifications may substitute in applications where the original part operates, provided the application does not require the original part's specific voltage or temperature limits.

The following substitute parts are grouped by their relationship to the main part:

Direct Substitutes (Identical Core Specifications):

93C46B-I/ST (Microchip Technology) — Identical electrical specifications, alternative packaging format (Tube)
93LC46BT-I/ST (Microchip Technology) — Extended voltage range (2.5V ~ 5.5V), alternative write cycle time (6ms), alternative packaging format (Cut Tape & Digi-Reel)

Cross-Manufacturer Substitutes (Equivalent Specifications):

BR93A46RFVT-WME2 (Rohm Semiconductor) — Extended temperature range (-40°C ~ 105°C), automotive grade qualification (AEC-Q100), alternative write cycle time (5ms)
BR93L46RFV-WE2 (Rohm Semiconductor) — Extended voltage range (1.8V ~ 5.5V), alternative write cycle time (5ms), legacy product status (Not For New Designs)

Parameter Comparison

Parameter	93C46BT-I/ST	93C46B-I/ST	93LC46BT-I/ST	BR93A46RFVT-WME2	BR93L46RFV-WE2
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Rohm Semiconductor	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	64 x 16	64 x 16	64 x 16
Memory Interface	Microwire	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C
Write Cycle Time	2ms	2ms	6ms	5ms	5ms
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-LSSOP
Packaging Format	Tape & Reel (TR)	Tube	Cut Tape & Digi-Reel	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Standard Applications (4.5V ~ 5.5V Supply): Select 93C46B-I/ST when Tube packaging is acceptable for manufacturing processes. This part maintains identical electrical specifications and active product status. Select 93C46BT-I/ST when Tape & Reel packaging is required for automated assembly.

For Extended Voltage Range Applications (Below 4.5V): Select 93LC46BT-I/ST for designs requiring operation at 2.5V supply voltage. This part is actively produced and verified by DiGi-Electronics. Note that write cycle time extends to 6ms compared to the original 2ms specification.

For Automotive and Extended Temperature Applications: Select BR93A46RFVT-WME2 when operating temperature range extends to 105°C or when AEC-Q100 automotive qualification is required. This Rohm Semiconductor part maintains 2 MHz clock frequency and 1Kbit capacity with 5ms write cycle time.

For Legacy or Discontinued Design Constraints: BR93L46RFV-WE2 is marked as Not For New Designs and should not be selected for new product development. This part is retained in the substitute list for reference only in legacy system maintenance scenarios.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating, and identical memory capacity and organization specifications.

Frequently Asked Questions (FAQ)

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

A: Electrical substitution is possible at the circuit level due to identical memory capacity, organization, interface protocol, and clock frequency. However, the extended write cycle time (6ms versus 2ms) must be evaluated against application timing requirements. The extended voltage range (2.5V ~ 5.5V) permits operation in designs originally specified for 4.5V ~ 5.5V.

Q: What is the difference between 93C46B-I/ST and 93C46BT-I/ST?

A: Both parts are manufactured by Microchip Technology with identical electrical specifications. The primary difference is packaging format: 93C46B-I/ST is supplied in Tube format, while 93C46BT-I/ST is supplied in Tape & Reel format. Selection depends on manufacturing assembly process requirements.

Q: Are Rohm Semiconductor parts (BR93A46RFVT-WME2 and BR93L46RFV-WE2) pin-compatible with Microchip parts?

A: Both manufacturers use 8-TSSOP package footprint with identical pinout for Microwire interface protocol. Physical and electrical pin compatibility is maintained. BR93L46RFV-WE2 uses 8-LSSOP package variant, which maintains the same footprint dimensions and pin spacing.

Q: Which substitute part should be selected for new product designs?

A: For new designs, select from parts with Active product status: 93C46BT-I/ST, 93C46B-I/ST, 93LC46BT-I/ST, or BR93A46RFVT-WME2. Avoid BR93L46RFV-WE2, which is marked Not For New Designs. Selection among active parts depends on specific voltage range, temperature range, and packaging format requirements.

Q: What is the impact of write cycle time differences among substitute parts?

A: Write cycle time determines the duration required to complete a single word or page write operation. The original 93C46BT-I/ST specifies 2ms. Substitutes with longer write cycle times (93LC46BT-I/ST at 6ms, BR93A46RFVT-WME2 and BR93L46RFV-WE2 at 5ms) require proportionally longer intervals between write operations. Applications with strict write timing requirements must account for these differences.

Q: Is automotive qualification required for my application?

A: BR93A46RFVT-WME2 carries AEC-Q100 automotive qualification and extended temperature range (-40°C ~ 105°C). Select this part only if automotive qualification is explicitly required by application specifications or supply chain requirements. Standard industrial-grade parts (Microchip 93C series) are suitable for non-automotive applications.

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