Equivalent & Substitute Parts for 93LC66BT-I/ST

Part Overview

The 93LC66BT-I/ST is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire interface protocol and operating across a 2.5V to 5.5V supply voltage range. This component is classified as Active product status with verified programmability through DiGi-Electronics. The device is packaged in 8-TSSOP surface mount configuration with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and package dimensions align with the original component requirements.

Key Parameters

Parameter	Specification
Memory Size	4Kbit
Memory Organization	256 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Write Cycle Time	6ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 93LC66BT-I/ST are qualified based on the following critical parameters: 4Kbit memory capacity, 256 x 16 organization, Microwire interface protocol, 2 MHz clock frequency, 8-TSSOP package footprint, and operating temperature range of -40°C to 85°C. The voltage supply range and write cycle time are secondary parameters that define operational compatibility. Parts meeting all primary criteria are classified as direct substitutes. The 93LC66B-I/ST from Microchip Technology maintains identical specifications across all critical parameters with only packaging format variation (Tube versus Cut Tape). The BR93L66FVT-WE2 from Rohm Semiconductor meets all primary electrical and mechanical requirements with enhanced voltage supply flexibility (1.8V minimum) and improved write cycle performance (5ms).

Parameter Comparison

Parameter	93LC66BT-I/ST (Main)	93LC66B-I/ST (Substitute)	BR93L66FVT-WE2 (Substitute)
Manufacturer	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	4Kbit	4Kbit	4Kbit
Memory Organization	256 x 16	256 x 16	256 x 16
Memory Interface	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz
Voltage Supply Range	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
Package Type	8-TSSOP	8-TSSOP	8-TSSOP-B
Write Cycle Time	6ms	6ms	5ms
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The 93LC66B-I/ST serves as a direct functional equivalent to the 93LC66BT-I/ST, with identical electrical and memory specifications. The primary distinction is packaging format: the substitute is supplied in Tube packaging while the main part is available in Cut Tape format. Both components maintain Active product status with verified DiGi-Electronics programmability and ROHS3 compliance. Selection between these two Microchip variants depends on procurement and assembly workflow requirements rather than technical performance.

The BR93L66FVT-WE2 from Rohm Semiconductor qualifies as a substitute with enhanced operational characteristics. This component extends the minimum supply voltage to 1.8V, providing greater flexibility in low-power applications. The write cycle time is reduced to 5ms compared to 6ms in the Microchip variants, resulting in faster programming operations. The 8-TSSOP-B package maintains mechanical compatibility with the original 8-TSSOP footprint. All three components carry Active product status, ROHS3 compliance, and unlimited moisture sensitivity rating, confirming suitability for equivalent circuit implementation.

Frequently Asked Questions (FAQ)

Q: Can the 93LC66B-I/ST replace the 93LC66BT-I/ST in production?

A: Yes. Both components are manufactured by Microchip Technology with identical memory capacity (4Kbit), organization (256 x 16), interface protocol (Microwire), clock frequency (2 MHz), voltage range (2.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), and package footprint (8-TSSOP). The difference is packaging format only: Cut Tape versus Tube. Electrical and functional performance are equivalent.

Q: What are the advantages of using BR93L66FVT-WE2 as a substitute?

A: The BR93L66FVT-WE2 offers two technical improvements: extended minimum supply voltage (1.8V versus 2.5V) and faster write cycle time (5ms versus 6ms). These characteristics make it suitable for low-voltage applications and scenarios requiring accelerated programming. All other specifications remain compatible with the original design.

Q: Are there package compatibility concerns with the BR93L66FVT-WE2?

A: The BR93L66FVT-WE2 uses 8-TSSOP-B packaging while the main part uses standard 8-TSSOP. Both packages maintain the same 0.173" width and 4.40mm dimensions, ensuring PCB footprint compatibility. The "-B" designation indicates a variant within the TSSOP family with equivalent mechanical fit.

Q: Do all three parts meet compliance requirements?

A: Yes. The 93LC66BT-I/ST, 93LC66B-I/ST, and BR93L66FVT-WE2 are all ROHS3 compliant with REACH Unaffected status and EAR99 export classification. All three carry unlimited moisture sensitivity rating (MSL 1).

Q: What determines substitution eligibility for 4Kbit Microwire EEPROM devices?

A: Substitution eligibility is determined by: 4Kbit memory capacity, 256 x 16 organization, Microwire interface protocol, 2 MHz clock frequency, 8-TSSOP package family, and -40°C to 85°C operating temperature range. Voltage supply range and write cycle time are secondary parameters that define operational performance but do not prevent substitution when specifications are met or exceeded.

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