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Microchip Technology 93C66CT-E/MNY
- Part No.:
- 93C66CT-E/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93C66CT-E/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,709
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Product details
Overview
93C66CT-E/MNY from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 8-bit organization, operating over 4.5–5.5 V supply, supporting Industrial (−40°C to +85°C) and Automotive (−40°C to +125°C) temperature ranges, and featuring Microwire-compatible 3-wire serial interface for nonvolatile data storage in embedded control systems.
For engineers reviewing the 93C66CT-E/MNY datasheet, 93C66CT-E/MNY pinout, 93C66CT-E/MNY application, or 93C66CT-E/MNY equivalent, key selection criteria include VCC range (4.5–5.5 V), 512 × 8-bit memory map, ERAL/WRAL support, Ready/Busy status signaling via DO, and automotive-grade qualification.
Technical Context
The 93C66CT-E/MNY implements a synchronous Microwire-compatible serial interface with CS, CLK, DI, and DO pins, requiring no external timing components. It uses self-timed erase/write cycles (2 ms typical) and includes automatic ERAL before WRAL, with power-on/off data protection and EWEN/EWDS write-protection logic.
Memory organization is fixed at 512 × 8-bit (no ORG pin function), distinguishing it from C-variant parts. Device status is reported via DO pin during programming - low = busy, high = ready - and supports sequential read without address retransmission when CS remains asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization) |
| VCC range | 4.5 V to 5.5 V - compatible only with 5 V systems; not functional below 4.5 V due to POR threshold |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration or configuration logging |
| Data retention | Greater than 200 years at 85°C - suitable for unattended industrial deployments |
| Write cycle time | 2 ms maximum - enables fast firmware parameter updates without blocking host MCU |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no SPI mode bits required |
| Temp range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain applications |
Pinout & Package
93C66CT-E/MNY is housed in an 8-lead TSSOP package (ST suffix), Pb-free, with exposed pad optional per Microchip packaging spec. Pin 1 is marked by laser dot; pin 1 ID corner is bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge for 93C-series |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stopped clock allowed mid-transfer |
| DI | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; tied high with CS to detect Start condition |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal circuitry; must be connected before VCC during power-up |
| NC | No Internal Connection | Pin 7 is unconnected - no routing or termination required; floating acceptable |
| VCC | Power Supply | 4.5–5.5 V supply; POR triggers at ~3.8 V - device resets if VCC drops below threshold |
| ORG | Organization Select | Not implemented on 93C66A/B variants - internally tied off; pin 6 is NC for this part |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host MCU polls DO instead of managing delays |
| ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents partial writes and data corruption |
| Power-on/off protection | Hardware-level lockout below 3.8 V VCC - prevents inadvertent writes during brown-out or power ramp |
| Ready/Busy status on DO | Enables non-blocking host operation - MCU can perform other tasks while waiting for write completion |
| EWEN/EWDS write-enable logic | Requires explicit enable before each write - prevents accidental overwrites from noise or software faults |
Applications
| Industrial Control Panel | Automotive Body Controller |
|---|---|
Use Scenario: Storing user-configurable parameters (e.g., display brightness, alarm thresholds) in factory HMIs with infrequent updates but long service life. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with 200-year data retention and 1M endurance - survives decades of maintenance cycles. Use Value: Eliminates battery-backed SRAM; reduces BOM cost and eliminates capacitor aging concerns in sealed enclosures. | Use Scenario: Saving door lock state, mirror position, and seat memory in body control modules subjected to thermal cycling and vibration. IC Role / Device Role / Timing Role: Automotive-grade EEPROM (E-temp) providing robust, low-pin-count serial storage interfaced directly to 8-bit microcontrollers. Use Value: Meets AEC-Q100 stress requirements; 125°C rating ensures reliability in engine bay proximity installations. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Recording dose history, calibration offsets, and safety-critical fault logs in Class II medical devices requiring traceability and audit compliance. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory with write-protection (EWEN/EWDS) and hardware POR lockout - prevents unauthorized or unstable writes. Use Value: Supports FDA 21 CFR Part 11 electronic record integrity requirements via deterministic write sequencing and status feedback. | Use Scenario: Storing tariff tables, billing counters, and firmware update metadata in utility meters deployed outdoors for >15 years. IC Role / Device Role / Timing Role: Long-retention, high-endurance serial EEPROM enabling meter firmware upgrades and lifetime energy accounting without service interruption. Use Value: Use Value: 200-year retention at 85°C exceeds IEC 62056-21 lifetime expectations; 4.5–5.5 V range matches meter's regulated 5 V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-E/MS | 2.5–5.5 V VCC range; 256 × 16-bit organization; same TSSOP-8 package; includes ORG pin (NC on this variant) | Supports wider voltage range and 16-bit word access - better suited for 16-bit MCU interfaces or mixed-voltage systems | Select if system operates below 4.5 V or requires 16-bit data path; verify ORG pin handling in layout |
| AT25DF041A-SH-B | 4 Mbit SPI NOR Flash; 2.7–3.6 V; sector erase; no built-in write-protection logic; requires external command sequencing | Higher density and faster random reads - appropriate for firmware storage, not parameter logging | Choose only for code shadowing or boot image storage; not drop-in for EEPROM-style byte-write use cases |
Compared with 93LC66BT-E/MS, the 93C66CT-E/MNY offers tighter VCC tolerance and guaranteed 5 V compatibility but lacks voltage flexibility; versus AT25DF041A-SH-B, it provides true byte-erasable EEPROM behavior with hardware write enable, essential for frequent small-data updates.
Availability
93C66CT-E/MNY is available at Aetrix Electronics and suitable for industrial control panels, automotive body controllers, and medical infusion pumps requiring stable component supply across extended product lifecycles.
Supply support for 93C66CT-E/MNY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count serial EEPROM applications in automotive, industrial, and consumer systems where reliability, long data retention, and simple 3-wire interface are critical.
FAQ
What is the minimum VCC required for reliable operation of the 93C66CT-E/MNY?
The 93C66CT-E/MNY has a power-on reset (POR) threshold of 3.8 V. Operation below this voltage is inhibited - the device remains in reset and ignores all commands. Valid operation requires VCC ≥ 4.5 V per the datasheet specification, making it strictly a 5 V system component. This differs from 93AA/93LC variants with lower POR thresholds.
Does the 93C66CT-E/MNY support 16-bit memory organization?
No. The 93C66CT-E/MNY is an 'A'-suffix device with fixed 512 × 8-bit organization. Unlike 'C'-suffix variants, it does not implement the ORG pin function - pin 6 is NC. Its instruction set and timing (e.g., 20-clock READ/WRITE) are optimized for 8-bit data transfer only.
How does the Ready/Busy status work on the 93C66CT-E/MNY DO pin?
During erase or write operations, the DO pin outputs Ready/Busy status: logic low indicates ongoing programming; logic high signals completion. To read status, CS must be brought high after ≥250 ns low time (TCSL). DO returns to High-Z on CS falling edge - status polling must occur with CS high.
Is an EWEN command required before every write operation on the 93C66CT-E/MNY?
Yes. The 93C66CT-E/MNY powers up in Erase/Write Disable (EWDS) mode. An EWEN instruction must precede any ERASE, WRITE, ERAL, or WRAL command. After successful write, best practice is to issue EWDS to prevent accidental overwrites - the device remains enabled until EWDS or power cycle.
What package type is used for the 93C66CT-E/MNY, and what does the '/MNY' suffix indicate?
The 93C66CT-E/MNY uses an 8-lead TSSOP package (ST designation). The '/MNY' suffix denotes Microchip's standard tape-and-reel packaging for automated SMT assembly - 3,000 units per reel, Pb-free (Matte Tin), and compliant with JEDEC J-STD-020 moisture sensitivity level 1.
93C66CT-E/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93C66CT-E/MNY FAQ
1.How can I place an order for 93C66CT-E/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66CT-E/MNY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 93C66CT-E/MNY reliable?
The price and inventory of 93C66CT-E/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C66CT-E/MNY is usually 5 days.
3.What payment methods are accepted for 93C66CT-E/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66CT-E/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66CT-E/MNY?
93C66CT-E/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66CT-E/MNY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 93C66CT-E/MNY?
For technical support, including 93C66CT-E/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66CT-E/MNY requirements.
6.How does Aetrix verify that 93C66CT-E/MNY is sourced from the original manufacturer or authorized distributors?
All 93C66CT-E/MNY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 93C66CT-E/MNY meets industry standards.
7.What is the process for return or replacement of 93C66CT-E/MNY?
All 93C66CT-E/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93C66CT-E/MNY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 93C66CT-E/MNY part is unused and in its original packaging.
Return procedure for 93C66CT-E/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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