NM93CS46M8 Equivalent & Substitute Parts

Part Overview

The NM93CS46M8 is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring Microwire interface protocol and 8-SOIC surface mount packaging. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design requirements and production continuity. The part operates within a 4.5V to 5.5V supply voltage range with a 1 MHz clock frequency and 10ms write cycle time.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	1 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC
Write Cycle Time	10ms
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the NM93CS46M8 are qualified based on the following critical parameters:

Memory Capacity & Organization: All substitutes maintain 1Kbit capacity with 64 x 16 organization, ensuring data storage compatibility.
Memory Interface: All substitutes retain Microwire interface protocol for direct functional compatibility.
Package Type: All substitutes use 8-SOIC surface mount packaging, maintaining PCB layout compatibility.
Supply Voltage Range: Substitutes must support the 4.5V ~ 5.5V operating range or provide extended compatibility.
Product Status: Active substitutes ensure long-term availability and production support.

The three qualified substitutes are manufactured by Microchip Technology and Rohm Semiconductor, all with active product status and verified programmability.

Parameter Comparison

Parameter	NM93CS46M8 (Main)	93C46B-I/SN	93C46BT-I/SN	BR93L46RFJ-WE2
Manufacturer	onsemi	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	64 x 16	64 x 16
Memory Interface	Microwire	Microwire	Microwire	Microwire
Clock Frequency	1 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	2ms	2ms	5ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts are functionally compatible with the NM93CS46M8 at the memory interface and package level. Selection should be based on the following criteria:

93C46B-I/SN (Microchip Technology): This substitute offers improved performance with 2 MHz clock frequency and 2ms write cycle time. It maintains unlimited moisture sensitivity and is ROHS3 compliant. Suitable for applications requiring enhanced speed and environmental compliance.

93C46BT-I/SN (Microchip Technology): Identical electrical performance to 93C46B-I/SN with 2 MHz operation and 2ms write cycle time. Differs in packaging format (Cut Tape & Digi-Reel) and moisture sensitivity level (3, 168 Hours). Select when tape and reel packaging is required for automated assembly.

BR93L46RFJ-WE2 (Rohm Semiconductor): Provides extended supply voltage range (1.8V ~ 5.5V) compared to the original part, enabling operation in lower voltage applications. Features 2 MHz clock frequency with 5ms write cycle time. ROHS3 compliant with unlimited moisture sensitivity. Select when lower voltage operation or extended voltage range is required.

All substitutes are active products with verified programmability and REACH compliance.

Frequently Asked Questions (FAQ)

Q: Can the NM93CS46M8 be directly replaced with any of these substitutes?

A: Yes, all three substitutes are pin-compatible and functionally equivalent at the Microwire interface level. They maintain identical 1Kbit capacity, 64 x 16 organization, and 8-SOIC packaging. No PCB modifications are required.

Q: What are the performance differences between the main part and substitutes?

A: The NM93CS46M8 operates at 1 MHz with 10ms write cycle time. All substitutes operate at 2 MHz (BR93L46RFJ-WE2 at 5ms write cycle), providing faster operation. This represents an improvement in performance and does not create compatibility issues.

Q: Are there voltage compatibility concerns?

A: The NM93CS46M8 requires 4.5V ~ 5.5V supply. The 93C46B-I/SN and 93C46BT-I/SN maintain this exact range. The BR93L46RFJ-WE2 extends the lower limit to 1.8V, making it compatible with a broader range of supply voltages while maintaining the 5.5V upper limit.

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

A: Both parts are electrically identical with 2 MHz operation and 2ms write cycle time. The primary differences are packaging format (Tube vs. Cut Tape & Digi-Reel) and moisture sensitivity level (1 vs. 3). Select based on assembly process requirements and storage environment.

Q: Are all substitutes RoHS compliant?

A: Yes, all three substitutes are ROHS3 compliant. The original NM93CS46M8 is RoHS non-compliant, making these substitutes suitable for applications requiring environmental compliance.

Q: What is the moisture sensitivity consideration?

A: The NM93CS46M8 and two substitutes (93C46B-I/SN and BR93L46RFJ-WE2) have MSL 1 (Unlimited). The 93C46BT-I/SN has MSL 3 (168 Hours), requiring controlled storage conditions. Select based on your manufacturing and storage capabilities.

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