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Microchip Technology 93C66BT-I/MS
- Part No.:
- 93C66BT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C66BT-I/MS.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
93C66BT-I/MS from Microchip Technology Inc. is a 4 Kbit serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and MSOP-8 package. It provides 512 × 8-bit organization (no ORG pin), supports self-timed erase/write cycles, and delivers >200 years data retention for nonvolatile configuration storage in industrial control systems.
For engineers reviewing the 93C66BT-I/MS datasheet, 93C66BT-I/MS pinout, 93C66BT-I/MS application, or 93C66BT-I/MS equivalent, key selection criteria include voltage compatibility (4.5–5.5 V), industrial temperature range (–40°C to +85°C), MSOP-8 footprint, 8-bit word organization, and Ready/Busy status signaling via DO pin.
Technical Context
The 93C66BT-I/MS implements a synchronous serial interface using CS, CLK, and DI/DO pins with start-bit detection logic. It operates exclusively in x8 mode (ORG pin not present), requiring no external configuration for word size. All instructions - READ, WRITE, ERASE, ERAL, WRAL - are executed via 12-clock-cycle sequences for x8 addressing.
Its internal power-on reset circuitry disables write operations until VCC ≥ 3.8 V, and the device powers up in Erase/Write Disable (EWDS) state. Programming cycles (TWC = 2 ms) are fully self-timed and initiated by CLK rising edge on last data bit - a timing behavior specific to the '93C' family and distinct from '93AA'/'93LC' variants.
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 - mandates use in 5 V systems; no low-voltage operation below 4.5 V |
| Endurance | 1,000,000 erase/write cycles - supports frequent field firmware updates or calibration storage |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unattended industrial deployments |
| Write Cycle Time | 2 ms (TWC) - fixed duration self-timed programming, independent of host clock rate |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5 V - enables fast serial transfers without external timing constraints |
| Temperature Range | Industrial: –40°C to +85°C - qualified for factory automation, motor drives, and PLC modules |
Pinout & Package
8-pin MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 ID corner defined per JEDEC MO-187.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic |
| CLK | Serial Clock | Positive-edge synchronized I/O; rising edge on final data bit triggers 2 ms self-timed write cycle |
| DI | Data Input | Accepts start bit, opcode, address (A8–A0), and data (D7–D0); no pull-up required |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal logic; connects to exposed pad if used |
| NC | No Connection | Pin 7 is unconnected internally - must be left floating or tied to VSS per layout best practice |
| VCC | Power Supply | 4.5–5.5 V only; internal POR disables writes below 3.8 V to prevent corruption |
| ORG | Organization Select | Not present on 93C66B/T variants - device permanently configured for 8-bit operation |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for host-controlled timing delays - 2 ms fixed TWC simplifies firmware design |
| Ready/Busy Status via DO | Enables polling-based programming flow without dedicated status lines or interrupts |
| Auto-Erase Before Write | Guarantees clean write operation - no separate ERASE command needed before WRITE |
| Power-On Data Protection | Hardware lockout below 3.8 V prevents spurious writes during brown-out or power ramp |
| Industry-Standard Microwire Interface | Ensures drop-in compatibility with legacy microcontrollers supporting 3-wire serial EEPROM protocols |
Applications
| Industrial Sensor Calibration | Motor Drive Configuration |
|---|---|
Use Scenario: Storing temperature-compensated gain/offset coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding factory-trimmed calibration data accessed at system boot. Use Value: Enables single-batch calibration across production; eliminates manual potentiometer adjustment and improves repeatability. | Use Scenario: Holding motor-specific parameters (pole count, current limits, commutation angles) in brushless DC drive modules. IC Role / Device Role / Timing Role: Serial configuration store read during initialization to configure PWM timers and current regulators. Use Value: Supports multi-motor platform reuse - same hardware runs different motors via stored parameter sets. |
| PLC I/O Module Identity | Power Supply Trim Storage |
Use Scenario: Storing unique module ID, firmware version, and channel mapping in modular PLC backplanes. IC Role / Device Role / Timing Role: Identity EEPROM queried by controller during hot-swap enumeration to load correct driver stack. Use Value: Enables plug-and-play expansion without manual dip-switch configuration or software reprogramming. | Use Scenario: Retaining digital trim values for precision DC-DC converter feedback networks after power cycling. IC Role / Device Role / Timing Role: Low-power serial memory storing 8-bit DAC codes that adjust reference voltages in PMICs. Use Value: Maintains ±0.5% output accuracy across thermal cycles and lifetime drift without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C66B-I/SN | Same 4 Kbit x8 organization, 4.5–5.5 V, but in SOIC-8 package (5.0 × 4.0 mm vs. MSOP-8's 3.0 × 3.0 mm) | Requires PCB redesign for larger footprint; better thermal dissipation in high-ambient environments | Select when board space allows SOIC and hand-soldering or legacy assembly processes are used. |
| 93LC66B-I/MS | 2.5–5.5 V supply range, same MSOP-8 package, but supports wider voltage operation and includes ORG pin (unused in B variant) | Compatible with mixed 3.3 V / 5 V systems; requires VCC ≥ 2.5 V for operation, unlike 93C66BT-I/MS's 4.5 V minimum | Select when system operates below 4.5 V or requires future voltage scalability without hardware change. |
Compared with 93C66B-I/SN and 93LC66B-I/MS, the 93C66BT-I/MS offers the smallest industrial-grade footprint for strict 5 V-only designs, while trading voltage flexibility for guaranteed noise immunity and simplified power rail design.
Availability
93C66BT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, motor drive configuration, and PLC I/O module identity applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93C66BT-I/MS 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, space-constrained industrial and automotive applications requiring reliable, low-pin-count serial EEPROM with robust power-supply immunity and long data retention.
FAQ
What is the memory organization of the 93C66BT-I/MS?
The 93C66BT-I/MS has a fixed 512 × 8-bit organization. Unlike 'C' variants with an ORG pin, this part belongs to the 'B' subfamily and does not include the ORG pin - it is permanently configured for 8-bit word access. The device contains 4,096 total bits arranged as 512 addresses each storing 8 bits, accessible via 9-bit addressing (A8–A0).
Does the 93C66BT-I/MS support 3.3 V operation?
No, the 93C66BT-I/MS does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V. Attempting to operate below 4.5 V risks data corruption due to internal power-on reset threshold of 3.8 V and undefined behavior outside the rated range. For 3.3 V systems, consider the 93LC66B-I/MS instead.
How is the Ready/Busy status signaled on the 93C66BT-I/MS?
The 93C66BT-I/MS signals Ready/Busy status on the DO pin: DO = low indicates an erase or write operation is in progress; DO = high indicates completion. To read status, CS must be brought high for ≥250 ns after the initial instruction, then sampled on subsequent CLK edges. DO returns to High-Z on CS falling edge.
What is the purpose of the NC pin on the 93C66BT-I/MS MSOP-8 package?
Pin 7 on the 93C66BT-I/MS is labeled NC (No Connection) and is not bonded internally. It must be left electrically floating or tied to VSS for mechanical stability and EMI reduction. This pin corresponds to the ORG pin location in 'C' variants but is unused in the 'B' version, reflecting the fixed 8-bit organization of the 93C66BT-I/MS.
Is the 93C66BT-I/MS RoHS compliant and lead-free?
Yes, the 93C66BT-I/MS is RoHS compliant and features a Pb-free Matte Tin (Sn) finish per JEDEC J-STD-609. The device meets EU Directive 2011/65/EU and is marked with the "3e" RoHS identifier on the package. All packaging - including the MSOP-8 body and leadframe - is lead-free and compatible with standard lead-free reflow profiles.
93C66BT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
93C66BT-I/MS FAQ
1.How can I place an order for 93C66BT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66BT-I/MS 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/MS reliable?
The price and inventory of 93C66BT-I/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 93C66BT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66BT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66BT-I/MS?
93C66BT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66BT-I/MS 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/MS?
For technical support, including 93C66BT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66BT-I/MS requirements.
6.How does Aetrix verify that 93C66BT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93C66BT-I/MS 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/MS meets industry standards.
7.What is the process for return or replacement of 93C66BT-I/MS?
All 93C66BT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C66BT-I/MS, 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/MS part is unused and in its original packaging.
Return procedure for 93C66BT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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