93C66B-E/P EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C66B-E/P is a 4Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This device operates at 2 MHz clock frequency with a 2ms write cycle time and is housed in an 8-PDIP through-hole package. The part maintains active product status with full RoHS3 compliance and verified programmability certification from DiGi-Electronics. Substitute parts are identified when equivalent memory capacity, interface protocol, package configuration, and operating temperature range are maintained across alternative manufacturer offerings or product variants.

Substiute Parts

93C66B-E/P

Microchip TechnologyIn Stock: 70193C66B-E/P Datasheet

Current PartRFQ

93LC66B-E/P

Microchip TechnologyIn Stock: 239693LC66B-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 93LC66B-E/P qualifies as a direct substitute for the 93C66B-E/P based on the following substitution criteria:

Maintained Parameters (Substitution Basis):

• Memory capacity: 4Kbit
• Memory organization: 256 x 16
• Serial interface protocol: Microwire
• Clock frequency: 2 MHz
• Package configuration: 8-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Operating temperature range: -40°C ~ 125°C
• Compliance certifications: RoHS3, REACH Unaffected, EAR99

Allowable Variations:

• Voltage supply range: 93LC66B-E/P operates at 2.5V ~ 5.5V (wider range than 93C66B-E/P at 4.5V ~ 5.5V)
• Write cycle time: 93LC66B-E/P specifies 6ms (extended from 2ms)

The 93LC66B-E/P represents a low-voltage variant of the 93C66B-E/P series, maintaining full functional compatibility while extending the minimum supply voltage specification downward and increasing write cycle time tolerance.

Parameter Comparison

Engineering Selection Recommendations

Both the 93C66B-E/P and 93LC66B-E/P maintain active product status with verified programmability and full RoHS3 compliance. The 93LC66B-E/P is suitable for applications where extended supply voltage range (down to 2.5V) is beneficial or where write cycle time tolerance of 6ms is acceptable. The 93C66B-E/P remains the appropriate selection for applications requiring the faster 2ms write cycle time specification or where supply voltage is constrained to the 4.5V ~ 5.5V range. Both devices are certified for use in regulated environments and carry identical REACH and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can the 93LC66B-E/P directly replace the 93C66B-E/P in existing designs?

A: The 93LC66B-E/P is functionally compatible with the 93C66B-E/P for applications where the 6ms write cycle time meets system requirements. If the design depends on the 2ms write cycle time specification, the 93C66B-E/P must be retained.

Q: What is the primary difference between these two parts?

A: The 93LC66B-E/P extends the minimum supply voltage specification to 2.5V and increases write cycle time to 6ms, while the 93C66B-E/P operates at 4.5V minimum with 2ms write cycle time. Both maintain identical memory capacity, interface protocol, and package configuration.

Q: Are both parts available in the same package?

A: Yes. Both the 93C66B-E/P and 93LC66B-E/P are supplied in 8-DIP (0.300", 7.62mm) through-hole packages with identical pinout and mechanical dimensions.

Q: Do these parts require different PCB layouts or socket types?

A: No. Both parts use identical 8-DIP package specifications and are compatible with standard DIP-8 sockets and through-hole PCB layouts.

Q: Are there compliance or certification differences between these parts?

A: Both parts maintain identical RoHS3, REACH, and EAR99 classifications. No compliance differentiation exists between the two devices.