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Microchip Technology 93LC66BT-E/MS
- Part No.:
- 93LC66BT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC66BT-E/MS.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,807
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Product details
Overview
93LC66BT-E/MS from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, supporting Microwire-compatible 3-wire serial interface (CS, CLK, DI/DO), 2.5–5.5 V supply, and industrial/automotive temperature range (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93LC66BT-E/MS datasheet, 93LC66BT-E/MS pinout, 93LC66BT-E/MS application, or 93LC66BT-E/MS equivalent, key selection criteria include its MSOP-8 package, automotive-grade qualification (E-temp), 8-bit fixed word size (no ORG pin), 1 million erase/write endurance, and 200-year data retention - critical for long-life automotive control modules and industrial sensor nodes.
Technical Context
This device implements a synchronous serial Microwire interface with start-bit detection, opcode-driven command set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and hardware-based write protection. Memory access uses rising-edge clocked serial input/output on shared DI/DO line, with CS-controlled device enable and status polling capability.
It operates in two distinct functional modes: standby (low ICC ≤ 5 µA) when CS = low, and active (read/write/erase) when CS = high and valid start condition detected. The absence of ORG pin confirms fixed 8-bit organization - eliminating external configuration logic required by 'C' variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit), sufficient for firmware parameter tables or sensor calibration coefficients in compact MCU systems. |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in diagnostic or logging applications. |
| Data retention | >200 years at 25°C - ensures nonvolatile storage integrity over full product lifecycle in automotive ECUs. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI mode bits or chip-select timing constraints. |
| Temp range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and transmission control environments. |
| Write time | 6 ms typical per byte/word - enables deterministic update latency in real-time control loops. |
| Standby current | ≤5 µA at VCC = 2.5 V - critical for battery-backed or energy-harvesting sensor nodes. |
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), Pb-free Matte Tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; controls entry/exit from standby mode. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no minimum duty cycle requirement. |
| 3 (DI) | Data Input | Receives start bit, opcodes, addresses, and write data; shares net with DO in single-line configurations (requires series resistor). |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS = low or during non-read operations. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; exposed pad (if used) must connect to VSS for thermal/electrical stability. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - not tied to VSS/VCC or routed on PCB. |
| 7 (ORG) | Organization Select | Not present on 93LC66B - pin is NC; confirms fixed 8-bit operation without external configuration. |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; internal POR circuit triggers at ~1.5 V; voltage detect prevents writes below safe threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - internal state machine manages auto-erase before write, reducing host MCU overhead. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write, preventing partial-program corruption in firmware update sequences. |
| Power-on/off data protection | Hardware lockout below VCC = 1.5 V prevents inadvertent writes during brown-out or power ramp-up. |
| Ready/Busy status on DO | Enables polling-based flow control without dedicated status lines - simplifies PCB routing and reduces pin count. |
| Sequential read mode | Continuous address increment while CS remains high - accelerates bulk read of configuration blocks with minimal clock cycles. |
| Pb-free & RoHS compliant | Meets global environmental compliance requirements for automotive and industrial manufacturing without exemptions. |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Storing trim values, fault codes, and adaptive learning parameters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MCU's Microwire peripheral; accessed during boot and runtime diagnostics. Use Value: 125°C rating ensures reliability near engine bay heat sources; 200-year retention avoids recalibration drift over vehicle lifetime. | Use Scenario: Holding module identification, calibration offsets, and channel-specific scaling factors in modular automation hardware. IC Role / Device Role / Timing Role: Serial configuration store for FPGA or ARM-based controller; updated only during commissioning or firmware upgrade. Use Value: 1M endurance supports factory reprogramming and field service; MSOP-8 footprint minimizes board area in dense backplane designs. |
| Smart Energy Meter | Medical Infusion Pump |
Use Scenario: Recording tamper events, billing cycle counters, and utility-specified metering constants requiring regulatory audit trails. IC Role / Device Role / Timing Role: Secure, low-power parameter storage isolated from main processor; accessed via dedicated secure bootloader. Use Value: 5 µA standby current extends battery backup life; automotive-grade temp range accommodates outdoor meter enclosures. | Use Scenario: Retaining drug library profiles, dose history logs, and safety-critical alarm thresholds across power loss. IC Role / Device Role / Timing Role: Fail-safe configuration memory with hardware write protection (EWDS default on power-up) and status-polling capability. Use Value: Power-on data protection prevents corruption during unexpected AC dropout; 200-year retention satisfies FDA long-term recordkeeping mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-I/MS | Same 512×8 organization and MSOP-8 package, but rated for −40°C to +85°C (I-temp only). | Not qualified for under-hood automotive use; suitable for commercial/industrial indoor environments. | Select if operating ambient stays below 85°C and AEC-Q100 qualification is unnecessary. |
| AT25DF041A-MAU-T | 4 Mbit SPI Flash (not EEPROM); quad I/O capable; no built-in erase/write endurance management. | Lacks automatic ERAL/WRAL and hardware write protection; requires external wear-leveling in firmware. | Choose only if higher density and faster sequential reads outweigh need for guaranteed 1M-cycle endurance and atomic write safety. |
Compared with 93LC66B-I/MS, the 93LC66BT-E/MS adds automotive temperature qualification and AEC-Q100 alignment; versus AT25DF041A-MAU-T, it provides true EEPROM behavior - byte-level writes, no block erasure, and deterministic 6 ms write latency - essential for safety-critical parameter updates.
Availability
93LC66BT-E/MS is available at Aetrix Electronics and suitable for automotive control units, industrial programmable logic controllers, and medical infusion devices requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for 93LC66BT-E/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 93LCxx family delivers cost-optimized, low-power serial EEPROMs targeting embedded systems needing reliable, small-footprint nonvolatile memory - especially where Microwire compatibility, extended temperature operation, and hardware write protection are mandatory.
FAQ
What is the memory organization of the 93LC66BT-E/MS?
The 93LC66BT-E/MS has a fixed 512 × 8-bit organization. It belongs to the 'B' variant group, meaning no ORG pin is implemented - the device is hardwired for 8-bit word access. This eliminates external configuration logic and simplifies interface design compared to 'C' variants with selectable x8/x16 modes.
Does the 93LC66BT-E/MS require an external pull-up resistor on the DO pin?
No, the 93LC66BT-E/MS does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when inactive. However, if DI and DO are shorted (single-wire bus), a 1–10 kΩ series resistor is recommended to prevent bus conflict during dummy-zero read preamble.
What is the maximum clock frequency supported by the 93LC66BT-E/MS at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC66BT-E/MS supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) for 2.5 V ≤ VCC < 5.5 V. Exceeding this limit risks setup/hold violations and unreliable command execution.
How is write protection implemented on the 93LC66BT-E/MS?
Write protection on the 93LC66BT-E/MS is implemented via dual hardware mechanisms: (1) power-on reset locks writes until EWEN command is issued, and (2) internal voltage detection disables all programming below ~1.5 V. Additionally, EWDS command disables further writes after each successful operation - best practice is to issue EWDS immediately post-write.
Is the 93LC66BT-E/MS pin-compatible with other 93LC66x variants in MSOP-8 package?
Yes, the 93LC66BT-E/MS is pin-compatible with all 93LC66x variants offered in MSOP-8 (e.g., 93LC66B-I/MS, 93LC66C-E/MS), sharing identical pinout (CS, CLK, DI, DO, VSS, NC, ORG, VCC). However, ORG is NC on 'A'/'B' devices like 93LC66BT-E/MS, while functional on 'C' variants - no PCB change is needed, but firmware must not drive ORG.
93LC66BT-E/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:
- 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:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93LC66BT-E/MS FAQ
1.How can I place an order for 93LC66BT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-E/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 93LC66BT-E/MS reliable?
The price and inventory of 93LC66BT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66BT-E/MS is usually 5 days.
3.What payment methods are accepted for 93LC66BT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-E/MS?
93LC66BT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-E/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 93LC66BT-E/MS?
For technical support, including 93LC66BT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-E/MS requirements.
6.How does Aetrix verify that 93LC66BT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-E/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 93LC66BT-E/MS meets industry standards.
7.What is the process for return or replacement of 93LC66BT-E/MS?
All 93LC66BT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-E/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 93LC66BT-E/MS part is unused and in its original packaging.
Return procedure for 93LC66BT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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