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93C66CT-E/SN EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The 93C66CT-E/SN is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This non-volatile memory device operates at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and supports both 512 x 8 and 256 x 16 memory organization configurations. The part is ROHS3 compliant and currently in active production status with 4419 units in stock.
Substitute parts are necessary when the primary part becomes unavailable, when alternative voltage specifications are required for specific applications, or when automotive-grade qualification is mandated for mission-critical designs.
Substiute Parts
Key Parameters
| Parameter | 93C66CT-E/SN |
|---|---|
| Manufacturer | Microchip Technology |
| Memory Size | 4Kbit |
| Memory Format | EEPROM |
| Memory Interface | Microwire |
| Memory Organization | 512 x 8, 256 x 16 |
| Clock Frequency | 3 MHz |
| Voltage Supply Range | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the 93C66CT-E/SN is determined by the following critical parameters:
Core Compatibility Requirements:
- Memory Size: 4Kbit (fixed requirement)
- Memory Format: EEPROM (fixed requirement)
- Memory Interface: Microwire (fixed requirement)
- Memory Organization: 512 x 8, 256 x 16 (fixed requirement)
- Package Type: 8-SOIC (fixed requirement)
- Mounting Type: Surface Mount (fixed requirement)
Variable Parameters Affecting Substitution:
- Clock Frequency: 2 MHz to 3 MHz acceptable
- Voltage Supply Range: Minimum 1.8V acceptable if application operates within overlapping range
- Write Cycle Time: 2ms to 6ms acceptable
- Operating Temperature: -40°C to 125°C required; -40°C to 85°C acceptable for non-extended-range applications
- Manufacturer: Microchip Technology or STMicroelectronics
- Packaging Format: Tape & Reel, Cut Tape & Digi-Reel, or Tube acceptable
- Compliance: ROHS3 and REACH Unaffected required
All substitute parts listed maintain identical memory capacity, interface protocol, and physical package specifications while offering variations in electrical performance characteristics and supply voltage ranges.
Parameter Comparison
| Parameter | 93C66CT-E/SN | 93LC66CT-E/SN | M93C66-RMN3TP/K | M93C66-WMN6P | M93C66-WMN6TP | M93C76-RMN3TP/K |
|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Memory Size | 4Kbit | 4Kbit | 4Kbit | 4Kbit | 4Kbit | 4Kbit |
| Memory Interface | Microwire | Microwire | Microwire | Microwire | Microwire | Microwire |
| Clock Frequency | 3 MHz | 3 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz |
| Voltage Supply Range | 4.5V ~ 5.5V | 2.5V ~ 5.5V | 1.8V ~ 5.5V | 2.5V ~ 5.5V | 2.5V ~ 5.5V | 1.8V ~ 5.5V |
| Write Cycle Time | 2ms | 6ms | 5ms | 5ms | 5ms | 5ms |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C |
| Package Type | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Packaging Format | Tape & Reel | Tape & Reel | Cut Tape & Digi-Reel | Tube | Cut Tape & Digi-Reel | Tape & Reel |
| Automotive Grade | No | No | Yes (AEC-Q100) | No | No | Yes (AEC-Q100) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active |
| Inventory (Pcs) | 4419 | 2534 | 15924 | 1543 | 35100 | 4952 |
Engineering Selection Recommendations
Primary Substitute - 93LC66CT-E/SN (Microchip Technology): This part maintains identical clock frequency (3 MHz) and operating temperature range (-40°C to 125°C) as the primary part. The extended voltage supply range (2.5V to 5.5V) provides greater flexibility for applications operating below 4.5V. DiGi-Electronics programmable verification status is confirmed. Select this part when maintaining Microchip Technology sourcing is preferred and extended low-voltage operation is required.
Secondary Substitutes - M93C66-WMN6TP and M93C66-WMN6P (STMicroelectronics): These parts operate at 2 MHz clock frequency with 2.5V to 5.5V supply voltage range. The M93C66-WMN6TP offers highest inventory availability (35100 units) and Cut Tape & Digi-Reel packaging. The M93C66-WMN6P provides Tube packaging alternative. Both are DiGi-Electronics programmable verified. Operating temperature range is limited to -40°C to 85°C. Select these parts for high-volume procurement or when reduced operating temperature range is acceptable.
Automotive-Grade Alternatives - M93C66-RMN3TP/K and M93C76-RMN3TP/K (STMicroelectronics): Both parts carry AEC-Q100 automotive qualification and support extended voltage range (1.8V to 5.5V). The M93C66-RMN3TP/K maintains -40°C to 125°C operating temperature. The M93C76-RMN3TP/K also maintains -40°C to 125°C operating temperature. Select these parts for automotive applications or when AEC-Q100 qualification is mandated by design specifications.
Frequently Asked Questions (FAQ)
Q: Can M93C66-WMN6P or M93C66-WMN6TP be used in applications requiring -40°C to 125°C operating temperature range?
A: No. These parts are specified for -40°C to 85°C operating temperature. Applications requiring full -40°C to 125°C range must use 93LC66CT-E/SN, M93C66-RMN3TP/K, or M93C76-RMN3TP/K.
Q: What is the impact of 2 MHz clock frequency in M93C66 variants compared to 3 MHz in the primary part?
A: The 2 MHz clock frequency in STMicroelectronics M93C66 variants is compatible with Microwire protocol implementations. Applications designed for 3 MHz operation will function correctly at 2 MHz with proportionally increased data transfer timing. No protocol incompatibility exists.
Q: Are all substitute parts compatible with the same PCB footprint?
A: Yes. All substitute parts use identical 8-SOIC package with 0.154" width and 3.90mm dimensions. PCB footprints are directly interchangeable without layout modifications.
Q: Which substitute part offers the lowest supply voltage operation?
A: M93C66-RMN3TP/K and M93C76-RMN3TP/K both support 1.8V minimum supply voltage, compared to 2.5V minimum for other substitutes and 4.5V minimum for the primary part.
Q: What is the difference between M93C66-RMN3TP/K and M93C76-RMN3TP/K?
A: Both parts are functionally equivalent for 4Kbit EEPROM Microwire operation with identical electrical specifications. The base product number differs (M93C66 versus M93C76), but both maintain 4Kbit capacity and identical interface characteristics.
Q: Can the primary 93C66CT-E/SN be substituted with 93LC66CT-E/SN in existing designs without modification?
A: Yes. The 93LC66CT-E/SN is a direct substitute with identical clock frequency, operating temperature range, and package specifications. The extended voltage range (2.5V to 5.5V) provides additional design flexibility without requiring circuit modifications.
Q: Which substitute part has the highest current inventory availability?
A: M93C66-WMN6TP offers the highest inventory with 35100 units in stock, followed by M93C66-RMN3TP/K with 15924 units.
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