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Microchip Technology 93C66BT-I/MNY
- Part No.:
- 93C66BT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93C66BT-I/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,366
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Product details
Overview
93C66BT-I/MNY from Microchip Technology Inc. is a 4 Kbit serial EEPROM with 512 × 8-bit organization, operating over 4.5–5.5 V supply, rated for industrial temperature (−40°C to +85°C), and featuring Microwire-compatible 3-wire serial interface, automatic erase-before-write, and 1 million erase/write cycles. It serves as nonvolatile configuration storage in embedded controllers and power management systems.
For engineers reviewing the 93C66BT-I/MNY datasheet, 93C66BT-I/MNY pinout, 93C66BT-I/MNY application, or 93C66BT-I/MNY equivalent, key selection criteria include its fixed 8-bit word size (no ORG pin), industrial-grade reliability, self-timed write cycle (2 ms), Ready/Busy status signaling via DO, and compatibility with legacy Microwire host controllers requiring minimal I/O overhead.
Technical Context
The 93C66BT-I/MNY implements a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO lines, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its memory array is organized as 512 words × 8 bits, with no ORG pin-confirming fixed x8 operation per Device Selection Table.
Write operations are self-timed at 2 ms (TWC) under 4.5–5.5 V, initiated by rising CLK edge on final data bit. Power-on data protection activates below 3.8 V (VPOR), and device enters EWDS mode at reset, requiring explicit EWEN before programming. DO provides active-low Ready/Busy status during erase/write when CS is reasserted after ≥250 ns low time (TCSL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware address handling. |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V logic systems; VPOR = 3.8 V ensures robust power-on data retention. |
| Write Cycle Time | 2 ms (TWC) - deterministic timing enables predictable firmware wait-state design without polling overhead beyond status check. |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration or logging updates in industrial control applications. |
| Data Retention | 200 years - guarantees long-term validity of stored configuration, calibration, or security keys without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware, using bit-banged GPIO. |
| Temp Range | −40°C to +85°C (Industrial grade) - validated for use in motor drives, PLCs, and industrial sensors without derating. |
Pinout & Package
93C66BT-I/MNY is packaged in an 8-lead MSOP (MS) - a compact, surface-mount package measuring 3.0 mm × 3.0 mm × 1.0 mm, with exposed pad optionally connected to VSS for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns (TCSL) between commands; initiates instruction execution on rising edge after Start condition. |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; rising edge on final data bit triggers 2 ms self-timed write cycle. |
| DI | Data Input | Accepts Start bit, opcodes (e.g., 01 for WRITE), 9-bit address, and 8-bit data; high-impedance when not selected. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during standby. |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling into serial interface. |
| NC | No Internal Connection | Pin 7 is unconnected - must be left floating or tied to VSS per layout best practice; no routing or pull-up required. |
| VCC | Power Supply | 4.5–5.5 V supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin to suppress switching noise during write cycles. |
| ORG | Organization Select | Not present - 93C66B devices have dedicated x16 organization; 93C66A/B/C variants with 'A' suffix (like 93C66A) are x8-only and omit ORG pin entirely. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control - firmware only waits for DO low-to-high transition or polls DO after TCSL delay, reducing CPU load. |
| Automatic Erase All Before Write All | WRAL command performs full-array erase + program in one atomic 15 ms operation (TWL), ensuring consistent state after bulk update. |
| Power-On/Off Data Protection | Hardware lockout below 3.8 V (VPOR) prevents corruption during brown-out or hot-plug events without external supervisor IC. |
| Device Status Signal (Ready/Busy) | DO pin doubles as status indicator - enables efficient polling instead of fixed delays, improving system responsiveness. |
| Industry Standard 3-Wire Serial I/O | Direct drop-in replacement for legacy Microwire EEPROMs; requires only three GPIOs and no level-shifting for 5 V systems. |
Applications
| Industrial Motor Control | Smart Energy Metering |
|---|---|
Use Scenario: Storing motor calibration coefficients, fault history logs, and runtime parameters in variable-frequency drives. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 200-year retention and 1M endurance for field-updatable parameters. Use Value: Enables zero-calibration drift over product lifetime and eliminates need for battery-backed RAM or external supervisory circuits. | Use Scenario: Holding tariff tables, metering constants, and tamper-event timestamps in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, low-power serial EEPROM interfaced to metrology SoC via Microwire, surviving >10k power cycles. Use Value: Meets ANSI/IEEE C12.19 data integrity requirements with hardware write-protection (EWEN/EWDS) and voltage-based lockout. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in BCMs for premium vehicles. IC Role / Device Role / Timing Role: Industrial-temp EEPROM interfaced to 8-bit MCU via bit-banged GPIO, tolerant of automotive load-dump transients. Use Value: Eliminates mechanical potentiometers and reduces BOM count while meeting AEC-Q100 stress test requirements. | Use Scenario: Storing sensor calibration matrices, user preferences, and audit trails in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Low-power (1 µA standby current) nonvolatile memory enabling fast boot and HIPAA-compliant data traceability. Use Value: Supports FDA 21 CFR Part 11 electronic record requirements with deterministic write timing and error-free retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-I/MNY | VCC range 2.5–5.5 V; supports wider supply flexibility but lacks 4.5–5.5 V optimized write timing. | Better suited for mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals); not recommended where strict 5 V rail stability is guaranteed. | Select if system operates below 4.5 V; verify VPOR (1.5 V) does not conflict with power sequencing. |
| 93AA66AT-I/MNY | VCC range 1.8–5.5 V; ultra-low-voltage capable with identical 512×8 organization and pinout. | Ideal for battery-powered or energy-harvesting designs; higher standby current (5 µA vs. 1 µA) at 2.5 V may impact longevity. | Choose for portable equipment; confirm clock frequency limits (1 MHz @ 1.8 V) align with host controller capability. |
Compared with 93LC66BT-I/MNY and 93AA66AT-I/MNY, the 93C66BT-I/MNY offers the shortest write cycle (2 ms) and highest noise immunity due to its 4.5–5.5 V operating window, making it optimal for stable 5 V industrial systems where speed and robustness outweigh voltage flexibility.
Availability
93C66BT-I/MNY is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, and automotive body control modules requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for 93C66BT-I/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 targets cost-sensitive, high-reliability embedded systems needing simple, proven serial EEPROM functionality - designed specifically for industrial, automotive, and medical applications demanding long data retention and robust power-supply immunity.
FAQ
What is the memory organization of the 93C66BT-I/MNY?
The 93C66BT-I/MNY has a fixed 512 × 8-bit (4 Kbit) organization. As a '93C66A' variant, it does not include an ORG pin and is permanently configured for 8-bit word access - eliminating external configuration logic and simplifying firmware address mapping compared to ORG-enabled 'C' versions.
Does the 93C66BT-I/MNY require an external pull-up resistor on the DO line?
Yes, the 93C66BT-I/MNY requires an external pull-up resistor (typically 4.7 kΩ to VCC) on the DO line. Because DO is open-drain during Ready/Busy status reporting and tri-stated during standby, the pull-up ensures valid logic-high levels when the device is not actively driving the line, preventing bus contention in multi-device Microwire configurations.
How is write protection implemented in the 93C66BT-I/MNY?
Write protection in the 93C66BT-I/MNY is implemented via the EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. The device powers up in EWDS mode, blocking all programming until EWEN is issued. After each WRITE or ERASE, executing EWDS restores protection - a hardware-enforced safeguard against accidental overwrites during power transitions or software faults.
What is the maximum clock frequency supported by the 93C66BT-I/MNY?
The 93C66BT-I/MNY supports a maximum clock frequency of 3 MHz when VCC is 4.5–5.5 V. This is specified in Table 1-2 (A1: FCLK) and enables high-throughput configuration reads or rapid sequential writes - critical for applications like bootloader parameter loading or real-time calibration updates.
Can the 93C66BT-I/MNY be used in automotive applications?
The 93C66BT-I/MNY is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). While it may function in some under-hood environments, Microchip specifies the 'E' grade (e.g., 93C66BT-E/MNY) for automotive use. For AEC-Q100 compliance and guaranteed operation at 125°C, the 'E' variant - with validated high-temp endurance and qualification testing - must be selected instead of the 'I' grade 93C66BT-I/MNY.
93C66BT-I/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:
- 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93C66BT-I/MNY FAQ
1.How can I place an order for 93C66BT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66BT-I/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 93C66BT-I/MNY reliable?
The price and inventory of 93C66BT-I/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C66BT-I/MNY is usually 5 days.
3.What payment methods are accepted for 93C66BT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66BT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66BT-I/MNY?
93C66BT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66BT-I/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 93C66BT-I/MNY?
For technical support, including 93C66BT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66BT-I/MNY requirements.
6.How does Aetrix verify that 93C66BT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 93C66BT-I/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 93C66BT-I/MNY meets industry standards.
7.What is the process for return or replacement of 93C66BT-I/MNY?
All 93C66BT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93C66BT-I/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 93C66BT-I/MNY part is unused and in its original packaging.
Return procedure for 93C66BT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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