NM93CS46LM8 Equivalent & Substitute Parts

Part Overview

The NM93CS46LM8 is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring Microwire interface protocol and 8-SOIC surface mount packaging. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and component procurement.

Substiute Parts

NM93CS46LM8

onsemiIn Stock: 1225NM93CS46LM8 Datasheet

Current PartRFQ

93LC46B-I/SN

Microchip TechnologyIn Stock: 2161493LC46B-I/SN Datasheet

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93LC46BT-I/SN

Microchip TechnologyIn Stock: 6644593LC46BT-I/SN Datasheet

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BR93L46RFJ-WE2

Rohm SemiconductorIn Stock: 9308BR93L46RFJ-WE2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NM93CS46LM8 is determined by the following critical parameters:

Core Compatibility Requirements:

• Memory Size: 1Kbit (64 x 16 organization)
• Memory Interface: Microwire protocol
• Package / Case: 8-SOIC form factor
• Mounting Type: Surface Mount

Performance Considerations:

• Clock Frequency: Minimum 250 kHz (substitute parts operate at 2 MHz, providing enhanced performance)
• Write Cycle Time: Maximum 15ms (substitute parts feature 5-6ms cycles, improving write performance)
• Voltage Supply Range: Minimum overlap of 2.7V ~ 5.5V
• Operating Temperature: Extended range preferred for industrial applications

All identified substitute parts meet the core compatibility requirements while offering improved electrical performance and active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Microchip Technology):

The 93LC46B-I/SN and 93LC46BT-I/SN are functionally equivalent alternatives from Microchip Technology. Both devices maintain identical electrical specifications and package form factors. The 93LC46BT-I/SN is preferred for high-volume production due to extended inventory availability (66,400 pcs) and Digi-Reel packaging compatibility. Both parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Secondary Substitute (Rohm Semiconductor):

The BR93L46RFJ-WE2 from Rohm Semiconductor provides an alternative with extended voltage supply range (1.8V ~ 5.5V) and superior write cycle performance (5ms). This part is suitable for applications requiring lower supply voltage operation. ROHS3 compliance and active product status confirm suitability for new designs.

Compliance Consideration:

All substitute parts achieve ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete NM93CS46LM8. This compliance upgrade is beneficial for applications subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46B-I/SN directly replace the NM93CS46LM8 without circuit modifications?

A: Yes. Both devices share identical memory capacity (1Kbit), organization (64 x 16), Microwire interface protocol, and 8-SOIC package form factor. The supply voltage range of the 93LC46B-I/SN (2.5V ~ 5.5V) encompasses the NM93CS46LM8 operating range (2.7V ~ 5.5V). No circuit modifications are required.

Q: What is the difference between 93LC46B-I/SN and 93LC46BT-I/SN?

A: Both parts are electrically identical. The primary difference is packaging format: 93LC46B-I/SN is supplied in Tube packaging, while 93LC46BT-I/SN is supplied in Cut Tape and Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why does the BR93L46RFJ-WE2 have a lower minimum supply voltage (1.8V)?

A: The BR93L46RFJ-WE2 is designed for low-power applications and supports operation at reduced supply voltages. This extended range does not affect compatibility with standard 2.7V ~ 5.5V applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (93LC46B-I/SN, 93LC46BT-I/SN, and BR93L46RFJ-WE2) are ROHS3 compliant, whereas the original NM93CS46LM8 is RoHS non-compliant.

Q: What is the impact of the faster clock frequency (2 MHz vs. 250 kHz) on system design?

A: The substitute parts operate at 2 MHz, providing 8x faster clock frequency than the original 250 kHz device. This improvement reduces data transfer time and write cycle duration (5-6ms vs. 15ms). Existing circuit designs will function correctly with the faster parts, as the Microwire interface protocol remains unchanged.

Q: Is the extended operating temperature range (-40°C ~ 85°C) of substitute parts beneficial?

A: Yes. The substitute parts support a wider operating temperature range compared to the NM93CS46LM8 (0°C ~ 70°C). This extended range provides greater flexibility for industrial and automotive applications.