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Microchip Technology 93C66BT-E/OT
- Part No.:
- 93C66BT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93C66BT-E/OT.pdf
- Description:
- IC EEPROM 4KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,032
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Product details
Overview
93C66BT-E/OT from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, designed for nonvolatile data storage in microcontroller-based systems. It operates over 4.5–5.5 V, supports Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), and delivers 1,000,000 erase/write cycles with >200-year data retention. Used in industrial control panels for parameter backup and calibration storage.
For engineers reviewing the 93C66BT-E/OT datasheet, 93C66BT-E/OT pinout, 93C66BT-E/OT application, or 93C66BT-E/OT equivalent, key selection criteria include its 4.5–5.5 V supply range, SOT-23-6 package, 8-bit x512 organization, ERAL/WRAL bulk operations, and Ready/Busy status signaling via DO pin.
Technical Context
The 93C66BT-E/OT implements a synchronous Microwire-compatible serial interface with start-bit detection, opcode-driven command set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and self-timed erase/write cycles initiated by CLK rising edge on final data bit. It lacks an ORG pin-fixed 8-bit organization per device family specification.
Power-on/off data protection is enforced via internal voltage detect circuitry triggering at 3.8 V (VPOR), and write operations require explicit Erase/Write Enable (EWEN) before execution. Standby current is ≤5 µA across industrial and automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin support |
| VCC range | 4.5 V to 5.5 V - requires stable regulated supply; below 3.8 V disables all programming |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - no SPI or I²C protocol |
| Write cycle time | 2 ms typical - enables fast firmware parameter updates without blocking host MCU |
| Endurance | 1,000,000 erase/write cycles - suitable for high-frequency logging or configuration changes |
| Data retention | >200 years at +25°C - ensures long-term reliability in unpowered storage |
| Temp range | −40°C to +125°C (Automotive E grade) - qualified for under-hood and powertrain applications |
Pinout & Package
Package: 6-lead SOT-23 (OT suffix), Pb-free Matte Tin finish, footprint compatible with JEDEC MO-178AA. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DO | Data Output / Ready-Busy indicator | Outputs read data on CLK rising edge; low = busy during erase/write, high = ready - enables polling without extra control lines |
| VSS | Ground reference | Return path for all I/O and core logic; must be low-impedance connection to avoid timing violations |
| DI | Data Input | Accepts start bit, opcodes, addresses, and write data on CLK rising edge - bidirectional use requires external series resistor to prevent bus conflict |
| VCC | Power supply | 4.5–5.5 V input; internal POR circuit blocks writes below 3.8 V - eliminates need for external reset supervisor |
| CS | Chip Select | Active-high enable; must remain low ≥250 ns between instructions - defines instruction boundaries and resets internal state |
| CLK | Serial clock | Synchronizes all data transfers; rising edge clocks in DI and clocks out DO - stoppable at any point for host flexibility |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host only monitors DO pin for completion |
| Automatic ERAL before WRAL | Ensures full array is erased prior to bulk write - prevents partial-data corruption in firmware update sequences |
| Power-on/off data protection | Hardware-enforced lockout below 3.8 V - prevents inadvertent writes during brown-out or power ramp |
| Ready/Busy status on DO | Single-pin status reporting - reduces PCB routing complexity vs. dedicated BUSY pin |
| Industry-standard 3-wire interface | Minimal GPIO usage on resource-constrained MCUs - compatible with legacy Microwire controllers |
Applications
| Industrial Sensor Calibration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing factory-calibrated sensor offsets and gain coefficients in programmable pressure sensors used in HVAC and process control systems. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and long-term retention - accessed during power-up initialization. Use Value: Enables field-replaceable sensors without recalibration; 1M endurance supports lifetime recalibration during maintenance. | Use Scenario: Holding door lock actuator configuration, window position limits, and mirror memory settings in automotive BCMs. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced directly to 8-bit MCU - survives battery disconnect and thermal cycling. Use Value: −40°C to +125°C rating ensures operation in engine bay proximity; 5.5 V tolerance accommodates load-dump transients. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Parameters |
Use Scenario: Retaining drug library definitions, dose limits, and alarm thresholds in Class II medical infusion pumps requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage of critical therapy parameters - accessed only during boot and service mode. Use Value: >200-year data retention meets FDA long-term device lifecycle requirements; EWEN/EWDS commands enforce write authorization. | Use Scenario: Storing tariff schedules, metering constants, and communication keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: High-reliability configuration store interfaced to metrology SoC - updated quarterly during firmware upgrades. Use Value: 2 ms write time enables rapid field updates; 1M endurance exceeds 20-year utility deployment requirements. |
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/OT | 2.5–5.5 V supply range; same 512×8 organization, SOT-23-6 package, and instruction set | Broader VCC range enables use with 3.3 V systems; lower voltage threshold increases risk of accidental writes during brown-out | Select when system operates at 2.5–3.6 V; verify POR behavior matches host power sequencing |
| AT25040B-MAHL-T | SPI interface (4-wire), 512×8 organization, 1.8–5.5 V, SOIC-8 package | Requires additional CS line and SPI peripheral; incompatible pinout and protocol - not drop-in | Choose for SPI-native designs or where higher clock speeds (>10 MHz) are needed; redesign required |
Compared with 93LC66BT-E/OT, the 93C66BT-E/OT offers tighter VCC regulation (4.5–5.5 V) and higher POR threshold (3.8 V), improving immunity to transient-induced writes. Versus AT25040B-MAHL-T, it uses simpler 3-wire Microwire signaling but lacks SPI speed and flexibility - ideal for cost-sensitive, low-pin-count MCU interfaces.
Availability
93C66BT-E/OT is available at Aetrix Electronics and suitable for industrial sensor calibration storage, automotive body control modules, and medical infusion pump settings requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93C66BT-E/OT 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was engineered for reliable, low-power nonvolatile storage in space-constrained embedded systems, emphasizing robustness in industrial and automotive environments through hardware write protection and wide-temperature qualification.
FAQ
What is the supply voltage range for the 93C66BT-E/OT?
The 93C66BT-E/OT operates strictly within 4.5 V to 5.5 V. Its internal power-on reset circuit triggers at 3.8 V (VPOR), disabling all erase/write functions below that threshold to prevent data corruption during brown-out conditions. This makes the 93C66BT-E/OT unsuitable for 3.3 V systems - use 93LC66BT-E/OT instead for dual-voltage compatibility.
Does the 93C66BT-E/OT have an ORG pin for word-size selection?
No, the 93C66BT-E/OT does not have an ORG pin. As a 'B'-suffixed variant in the 93C66x series, it is fixed at 512 × 8-bit organization. The ORG pin is only present on 'C'-suffix devices (e.g., 93C66C). The 93C66BT-E/OT pinout matches the SOT-23-6 package layout with six functional terminals: CS, CLK, DI, DO, VSS, and VCC.
How does the Ready/Busy status work on the 93C66BT-E/OT?
The DO pin of the 93C66BT-E/OT serves dual function: data output during READ and Ready/Busy indicator during erase/write. When CS is brought high after ≥250 ns low time (TCSL), DO goes low to signal ongoing operation and returns high upon completion. Issuing a Start bit followed by CS low clears the status. This eliminates need for separate BUSY pin and simplifies host polling logic.
What is the maximum clock frequency supported by the 93C66BT-E/OT?
The 93C66BT-E/OT supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. AC timing parameters (e.g., TCKH ≥200 ns, TCKL ≥100 ns) are guaranteed across the full automotive temperature range (−40°C to +125°C). Clock may be paused mid-transfer - no minimum continuous run requirement - enabling flexible host MCU scheduling.
Is the 93C66BT-E/OT RoHS compliant and lead-free?
Yes, the 93C66BT-E/OT is Pb-free and RoHS compliant, with Matte Tin (Sn) finish per JEDEC standard. The SOT-23-6 package (OT) carries the "3e3" Pb-free marking on the top surface per Microchip's DS21795E packaging specification. Full compliance documentation, including test reports and substance declarations, is available through Aetrix Electronics' component traceability portal.
93C66BT-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- SOT-23-6
93C66BT-E/OT FAQ
1.How can I place an order for 93C66BT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66BT-E/OT 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/OT reliable?
The price and inventory of 93C66BT-E/OT 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/OT is usually 5 days.
3.What payment methods are accepted for 93C66BT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66BT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66BT-E/OT?
93C66BT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66BT-E/OT 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/OT?
For technical support, including 93C66BT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66BT-E/OT requirements.
6.How does Aetrix verify that 93C66BT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93C66BT-E/OT 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/OT meets industry standards.
7.What is the process for return or replacement of 93C66BT-E/OT?
All 93C66BT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93C66BT-E/OT, 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/OT part is unused and in its original packaging.
Return procedure for 93C66BT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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