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Microchip Technology 93C66BT-E/SN
- Part No.:
- 93C66BT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C66BT-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:274
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Product details
Overview
93C66BT-E/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, designed for nonvolatile data storage in embedded systems. It operates within 4.5–5.5 V supply range, supports Industrial and Automotive temperature grades (−40°C to +125°C), and features Microwire-compatible 3-wire serial interface with Ready/Busy status signaling. Used in automotive body control modules for storing calibration data.
For engineers reviewing the 93C66BT-E/SN datasheet, 93C66BT-E/SN pinout, 93C66BT-E/SN application, or 93C66BT-E/SN equivalent, key selection criteria include its 4.5–5.5 V VCC range, 8-bit x512 organization, automotive-grade −40°C to +125°C operation, self-timed erase/write cycles, and SOIC-8 (SN) package compatibility with legacy board layouts.
Technical Context
The 93C66BT-E/SN implements a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO pins, requiring no external timing components. Its internal logic enforces power-on data protection and automatic ERAL before WRAL, with ORG pin omitted (fixed 8-bit mode per 'A' variant designation).
It uses CMOS EEPROM cell technology enabling 1,000,000 erase/write cycles and >200 years data retention. Programming is initiated by falling edge of CS (for 93C versions), with DO pin providing real-time Ready/Busy status during write/erase operations.
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 - ensures compatibility with 5 V automotive and industrial logic rails |
| Temperature grade | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and chassis-mounted applications |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI master required |
| Endurance | 1,000,000 erase/write cycles - supports frequent firmware parameter updates in field-deployed devices |
| Data retention | >200 years at +125°C - guarantees long-term calibration data integrity over product lifetime |
| Write cycle time | 2 ms typical - enables fast configuration writes without blocking host MCU execution |
Pinout & Package
93C66BT-E/SN is packaged in 8-lead SOIC (SN), with lead finish Pb-free (Matte Tin). Pin 1 is marked by laser dot; package conforms to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| CLK | Serial Clock | Positive-edge synchronized I/O clock; stops/resumes freely without corrupting ongoing transfers |
| DI | Data Input | Accepts Start bit, opcode, address, and data; tied to DO only with current-limiting resistor to avoid bus conflict |
| 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 digital and analog circuitry; requires low-impedance connection to system GND plane |
| NC | No Internal Connection | Pin 7 is unconnected - must remain floating or tied to GND per layout best practice |
| VCC | Power Supply | 4.5–5.5 V supply; internal POR triggers at 3.8 V - prevents spurious writes during brown-out |
| ORG | Organization Select | Not present on 93C66A/B variants - fixed 8-bit mode eliminates external configuration logic |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (2 ms max) |
| Auto-ERAL before WRAL | Ensures full array readiness prior to bulk write - no separate erase command required in firmware |
| Power-on/off data protection | Hardware-enforced lockout below 3.8 V VCC prevents corruption during power ramp-up/down |
| Ready/Busy status on DO | Enables efficient polling without dedicated status lines - reduces BOM count and PCB routing complexity |
| Sequential read function | Allows continuous memory dump with single CS assertion - cuts firmware overhead for logging or diagnostics |
Applications
| Automotive Body Control Unit | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed data integrity across ignition cycles and battery disconnects. Use Value: Enables user-customized settings retention without backup capacitors or supercapacitors - reduces system cost and footprint. | Use Scenario: Holding I/O mapping tables, scaling coefficients, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Field-updatable configuration memory accessed via microcontroller's GPIO-driven Microwire interface. Use Value: Supports factory and field reconfiguration without firmware reflashing - accelerates commissioning and maintenance. |
| Medical Device Calibration Data | Consumer Appliance Settings Retention |
Use Scenario: Saving sensor offset/gain values and patient-specific therapy parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant, long-life storage for safety-critical calibration constants validated during device boot. Use Value: Meets IEC 62304 data integrity requirements with >200-year retention at +125°C - eliminates recalibration service intervals. | Use Scenario: Preserving user preferences (temperature setpoints, cycle selections, language) across power loss in smart washing machines. IC Role / Device Role / Timing Role: Low-power, high-reliability memory interfaced directly to main MCU without level-shifting. Use Value: Achieves zero-power data hold using only VCC-supplied energy - no auxiliary power rail needed for memory backup. |
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/SN | Wider VCC range (2.5–5.5 V); same pinout, 8-bit organization, and SOIC-8 package | Supports mixed-voltage systems (e.g., 3.3 V MCU with 5 V peripherals); not qualified for full automotive temp range | Select when operating below 4.5 V or when extended voltage flexibility outweighs AEC-Q100 compliance needs |
| AT25DF041A-SH-B | 4 Mbit SPI NOR Flash; quad I/O capable; no built-in erase/write disable logic | Higher density but requires external software management of wear leveling and erase blocks | Choose only if >4 Kbit capacity is mandatory and host firmware can implement flash translation layer |
Compared with 93LC66BT-E/SN, the 93C66BT-E/SN offers tighter VCC regulation (4.5–5.5 V) and full AEC-Q100 automotive qualification, while AT25DF041A-SH-B trades simplicity and endurance for density and speed - making 93C66BT-E/SN optimal for robust, low-complexity parameter storage.
Availability
93C66BT-E/SN is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for 93C66BT-E/SN 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 devices, and memory solutions, headquartered in Chandler, Arizona.
The 93C66BT-E/SN belongs to Microchip's legacy 93XX serial EEPROM family, engineered specifically for reliable, low-pin-count nonvolatile storage in harsh environments where voltage stability and data longevity are critical.
FAQ
What is the maximum clock frequency supported by the 93C66BT-E/SN?
The 93C66BT-E/SN supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. This timing aligns with standard Microwire interface requirements and allows direct connection to most 8/16-bit microcontrollers without clock dividers. The 93C66BT-E/SN datasheet specifies TCKH ≥ 200 ns and TCKL ≥ 100 ns under these conditions.
Does the 93C66BT-E/SN require an external pull-up resistor on the DO pin?
No, the 93C66BT-E/SN does not require an external pull-up on DO. The output buffer actively drives high or low during read or status polling, and enters High-Z when CS is low or during standby. External pull-ups may interfere with valid logic levels and are unnecessary per Microchip's recommended interface design.
Is the 93C66BT-E/SN pin-compatible with the 93AA66AT-I/SN?
Yes, the 93C66BT-E/SN is pin-compatible with the 93AA66AT-I/SN in SOIC-8 (SN) package, sharing identical pin functions and physical layout. However, they differ in VCC range (4.5–5.5 V vs. 1.8–5.5 V), temperature grade (E vs. I), and POR threshold (3.8 V vs. 1.5 V), so electrical validation is required before substitution.
How does the 93C66BT-E/SN handle power loss during a write operation?
The 93C66BT-E/SN incorporates hardware power-loss protection: if VCC drops below 3.8 V during erase/write, the internal circuitry aborts the operation and retains pre-write data. No partial writes occur, and the memory remains fully readable after recovery - ensuring deterministic behavior in automotive and industrial power environments.
Can the 93C66BT-E/SN be used in a shared bus configuration with other Microwire devices?
Yes, the 93C66BT-E/SN supports shared-bus operation via individual CS lines. Since it lacks a chip ID or address byte, multiple 93C66BT-E/SN devices can share CLK and DI/DO lines as long as each has a dedicated CS signal. This simplifies multi-parameter storage designs without requiring bus arbitration logic.
93C66BT-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-SOIC
93C66BT-E/SN FAQ
1.How can I place an order for 93C66BT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66BT-E/SN 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/SN reliable?
The price and inventory of 93C66BT-E/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 93C66BT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66BT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66BT-E/SN?
93C66BT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66BT-E/SN 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/SN?
For technical support, including 93C66BT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66BT-E/SN requirements.
6.How does Aetrix verify that 93C66BT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C66BT-E/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 93C66BT-E/SN?
All 93C66BT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C66BT-E/SN, 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/SN part is unused and in its original packaging.
Return procedure for 93C66BT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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