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Microchip Technology 93C66BT-E/MNY
- Part No.:
- 93C66BT-E/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93C66BT-E/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
93C66BT-E/MNY from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, 4.5–5.5 V supply range, and industrial temperature grade (−40°C to +85°C). It uses Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), supports self-timed erase/write cycles, and delivers 1,000,000 endurance cycles with >200 years data retention. It is used in embedded system configuration storage where compact nonvolatile memory with robust power-on/off protection is required.
For engineers reviewing the 93C66BT-E/MNY datasheet, 93C66BT-E/MNY pinout, 93C66BT-E/MNY application, or 93C66BT-E/MNY equivalent, key selection considerations include its fixed 8-bit word size (no ORG pin), TSSOP-8 package, 3 MHz max clock frequency at 4.5–5.5 V, Ready/Busy status via DO pin, and automotive-grade variant availability (E-temp) for extended thermal environments.
Technical Context
The 93C66BT-E/MNY implements a synchronous Microwire-compatible serial interface with dedicated CS, CLK, DI, and DO pins - no shared bidirectional data line. Its internal logic requires a Start bit (CS high + DI high on first CLK rising edge) before accepting opcode, address, and data sequences.
All programming operations (ERASE, WRITE, ERAL, WRAL) are self-timed and initiated by the falling edge of CS for 93C-series devices; DO provides real-time Ready/Busy status when CS is reasserted after ≥250 ns low time. Power-on reset circuitry inhibits operation below 3.8 V, and EWEN/EWDS commands enforce explicit write-enable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization; fixed x8 mode, no ORG pin) |
| VCC range | 4.5 V to 5.5 V - operation disabled below 3.8 V for data protection |
| Interface | 3-wire Microwire-compatible serial (CS, CLK, DI, DO) - no SPI or I²C protocol |
| Max clock frequency | 3 MHz at 4.5–5.5 V - defines maximum instruction throughput and timing margin |
| Write cycle time | 2 ms per byte - determines minimum time between successive WRITE commands |
| Endurance & retention | 1,000,000 erase/write cycles and >200 years data retention at 25°C - validated for long-life embedded use |
| Temperature range | −40°C to +85°C (Industrial grade) - qualified for commercial and industrial control applications |
Pinout & Package
93C66BT-E/MNY is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch and Pb-free Matte Tin finish. Pin 1 is marked by laser dot; pin 1 ID corner is bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed programming on falling edge |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; opcodes, addresses, and data clocked in on rising edge |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; must be stable before first CLK rising edge |
| 4 (DO) | Data Output / Status | Outputs read data on rising CLK edge; indicates Ready/Busy during programming when CS is reasserted |
| 5 (VSS) | Ground | Reference return path for all signals and power; must be low-impedance connection |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization Select | Not present on 93C66A/B variants - pin is NC; only applicable to 'C' versions |
| 8 (VCC) | Power Supply | 4.5–5.5 V supply; internal POR circuit blocks operation below 3.8 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - device manages internal auto-erase and programming duration (2 ms) |
| Ready/Busy status via DO | Enables polling-based firmware flow control without fixed delay loops or external interrupt dependency |
| Power-on/off data protection | Hardware-level VCC monitoring prevents writes during brown-out or power ramp-up/down transitions |
| EWEN/EWDS command lock | Requires explicit Erase/Write Enable before any programming - prevents accidental overwrites in runtime |
| Sequential read mode | Allows continuous address increment and data streaming while CS remains high - reduces host overhead |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) Trim Settings |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping, and user-defined logic parameters in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed infrequently during commissioning or field updates via microcontroller SPI-like GPIO bit-banging. Use Value: Ensures parameter persistence across power cycles and supports field reconfiguration without hardware change or firmware update. | Use Scenario: Retaining seat position memory, mirror angle presets, and lighting profiles in vehicle body control units. IC Role / Device Role / Timing Role: Dedicated 4 Kbit parameter store interfaced to 8-bit MCU via 3-wire bus; accessed during ignition-on initialization and user input events. Use Value: Delivers guaranteed data integrity under automotive voltage transients and thermal cycling (−40°C to +85°C). |
| Medical Infusion Pump Calibration Data | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Holding factory-calibrated flow rate coefficients and safety thresholds that must survive battery replacement and sterilization cycles. IC Role / Device Role / Timing Role: Tamper-resistant, long-retention memory mapped into MCU's peripheral address space via bit-banged Microwire interface. Use Value: Meets >200-year data retention requirement and 1M-cycle endurance for periodic calibration updates over product lifetime. | Use Scenario: Storing post-deployment firmware patches and tariff table updates in utility-grade electricity meters deployed for 15+ years. IC Role / Device Role / Timing Role: Secure, low-power serial EEPROM accessed during meter boot or scheduled OTA update windows using deterministic timing. Use Value: Enables field-upgradable functionality without replacing main MCU or adding external flash controller complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C66B-E/MNY | 16-bit word organization (256 × 16); same VCC range, package, and temp grade | Requires host software adaptation for 16-bit addressing and data framing; not drop-in compatible | Select if system architecture uses 16-bit data paths and minimizes instruction count per write |
| AT25040B-MAHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, SOIC-8; no Ready/Busy pin | Requires SPI master peripheral instead of bit-banged Microwire; lacks DO-based status polling | Choose when migrating to standardized SPI infrastructure and accepting fixed 10 ms write latency |
Compared with 93C66B-E/MNY, the 93C66BT-E/MNY offers simpler 8-bit data handling and identical timing behavior; versus AT25040B-MAHL-T, it provides deterministic status feedback and tighter voltage tolerance but requires custom interface firmware.
Availability
93C66BT-E/MNY is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and medical device design requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93C66BT-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona.
The 93Cxx series was designed specifically for cost-sensitive, low-power embedded systems needing reliable serial EEPROM with hardware-level data protection and minimal pin count - targeting applications where SPI or I²C overhead is undesirable.
FAQ
What is the memory organization of the 93C66BT-E/MNY?
The 93C66BT-E/MNY has a fixed 512 × 8-bit organization. Unlike 'C' variants, it lacks an ORG pin and operates exclusively in x8 mode. This eliminates external configuration logic and simplifies host interface design for byte-oriented data storage. The 93C66BT-E/MNY does not support 16-bit word access.
Does the 93C66BT-E/MNY support automatic erase before write?
Yes, the 93C66BT-E/MNY performs automatic erase before each WRITE operation - no separate ERASE command is needed. This self-timed auto-erase is integral to its 2 ms write cycle time and ensures data integrity without host intervention. The 93C66BT-E/MNY also supports ERAL (Erase All) and WRAL (Write All) for bulk operations.
How is Ready/Busy status monitored on the 93C66BT-E/MNY?
Ready/Busy status is monitored by polling the DO pin after reasserting CS high for ≥250 ns following a programming command. DO = low indicates ongoing erase/write; DO = high confirms completion. Issuing a new Start bit clears the status. This mechanism enables precise firmware synchronization without fixed delays. The 93C66BT-E/MNY does not provide interrupt-driven status signaling.
What is the purpose of the EWEN and EWDS commands in the 93C66BT-E/MNY?
The EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands enforce explicit write authorization. The 93C66BT-E/MNY powers up in EWDS mode, blocking all programming until EWEN is issued. After each WRITE or ERASE, executing EWDS restores protection. This prevents accidental overwrites due to noise or software faults - a critical feature for field-deployed 93C66BT-E/MNY applications.
Is the 93C66BT-E/MNY pin-compatible with other 93C66 variants in TSSOP-8?
Yes, the 93C66BT-E/MNY shares identical TSSOP-8 pinout and footprint with all 93C66A/B/C variants in the same package (e.g., 93C66A-E/MNY, 93C66C-E/MNY). Pin functions (CS, CLK, DI, DO, VSS, NC, ORG, VCC) match exactly. However, ORG is NC on 93C66A/B devices like the 93C66BT-E/MNY, so no external tie is required - unlike 93C66C which needs ORG pulled high/low for x16/x8 mode selection.
93C66BT-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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93C66BT-E/MNY FAQ
1.How can I place an order for 93C66BT-E/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66BT-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 93C66BT-E/MNY reliable?
The price and inventory of 93C66BT-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 93C66BT-E/MNY is usually 5 days.
3.What payment methods are accepted for 93C66BT-E/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66BT-E/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66BT-E/MNY?
93C66BT-E/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66BT-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 93C66BT-E/MNY?
For technical support, including 93C66BT-E/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66BT-E/MNY requirements.
6.How does Aetrix verify that 93C66BT-E/MNY is sourced from the original manufacturer or authorized distributors?
All 93C66BT-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 93C66BT-E/MNY meets industry standards.
7.What is the process for return or replacement of 93C66BT-E/MNY?
All 93C66BT-E/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93C66BT-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 93C66BT-E/MNY part is unused and in its original packaging.
Return procedure for 93C66BT-E/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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