93C46B-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46B-E/ST is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This component is classified as Active product status and is widely used in embedded systems requiring non-volatile memory storage with low pin count and minimal board space.

Finding equivalent and substitute parts becomes necessary due to inventory constraints, supply chain disruptions, or design optimization requirements. The substitute parts listed below maintain functional compatibility through matching memory capacity, interface protocol, clock frequency, and package form factor specifications.

Substiute Parts

93C46B-E/ST

Microchip TechnologyIn Stock: 99493C46B-E/ST Datasheet

Current PartRFQ

BR93L46RFV-WE2

Rohm SemiconductorIn Stock: 2895BR93L46RFV-WE2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the 93C46B-E/ST is determined by the following critical parameters:

Primary Compatibility Criteria:

• Memory capacity: 1Kbit (64 x 16 organization)
• Serial interface protocol: Microwire
• Clock frequency: 2 MHz minimum
• Package footprint: 8-pin TSSOP/SSOP form factor with 4.40mm width
• Supply voltage: Minimum 4.5V support required
• Non-volatile EEPROM technology

Secondary Compatibility Factors:

• Operating temperature range (minimum -40°C to 125°C coverage)
• Write cycle time tolerance
• RoHS3 compliance certification
• Surface mount capability

The BR93L46RFV-WE2 manufactured by Rohm Semiconductor qualifies as a functional substitute based on matching memory specifications, Microwire interface protocol, 2 MHz operation, and compatible 8-pin SSOP-B package geometry.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (93C46B-E/ST): The 93C46B-E/ST maintains Active product status with full manufacturer support and is the preferred choice for new designs. This part offers the extended operating temperature range (-40°C to 125°C) and meets all current RoHS3 compliance requirements.

Substitute Selection (BR93L46RFV-WE2): The BR93L46RFV-WE2 is classified as Not For New Designs but remains functionally compatible for legacy system maintenance, repair, or inventory supplementation. This substitute provides wider supply voltage tolerance (1.8V to 5.5V) but operates within a reduced temperature range (-40°C to 85°C). The extended write cycle time (5ms versus 2ms) must be evaluated against application timing requirements.

Selection between these parts should prioritize the 93C46B-E/ST for new development. The BR93L46RFV-WE2 is suitable only when the 93C46B-E/ST is unavailable and the application constraints permit the reduced temperature operating range and extended write cycle time.

Frequently Asked Questions (FAQ)

Q: Can BR93L46RFV-WE2 directly replace 93C46B-E/ST in existing designs?

A: Direct replacement is possible if the application operates within -40°C to 85°C temperature range and the 5ms write cycle time does not violate system timing specifications. The Microwire interface, memory capacity, and pin configuration are identical. Verify supply voltage requirements; BR93L46RFV-WE2 supports lower voltage operation (1.8V minimum) compared to 93C46B-E/ST (4.5V minimum).

Q: What are the package differences between 8-TSSOP and 8-SSOP-B?

A: Both packages maintain identical 0.173" width and 4.40mm body dimensions with 8-pin surface mount configuration. TSSOP and SSOP-B designations refer to manufacturer-specific package variants with compatible PCB footprints. Verify footprint compatibility with design documentation before substitution.

Q: Why is BR93L46RFV-WE2 marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development and support for this part number. While functionally compatible and available in inventory, Microchip's 93C46B-E/ST is the recommended choice for new product development to ensure long-term supply chain stability and manufacturer support.

Q: Are there differences in write cycle performance between these parts?

A: The 93C46B-E/ST specifies 2ms write cycle time while BR93L46RFV-WE2 requires 5ms. Applications with strict timing requirements or high-frequency write operations must use the 93C46B-E/ST. For applications with relaxed write timing, the BR93L46RFV-WE2 substitute is acceptable.

Q: Do both parts meet current compliance standards?

A: Both the 93C46B-E/ST and BR93L46RFV-WE2 are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is rated 1 (Unlimited) for both parts, indicating no special handling requirements during storage or assembly.