My Inquiry
My Account
Microchip Technology 93LC66BT-I/MNY
- Part No.:
- 93LC66BT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93LC66BT-I/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,191
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93LC66BT-I/MNY from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS/CLK/DI/DO), and industrial temperature range (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC66BT-I/MNY datasheet, 93LC66BT-I/MNY pinout, 93LC66BT-I/MNY application, or 93LC66BT-I/MNY equivalent, key selection criteria include VCC range (2.5–5.5 V), 8-bit word size (no ORG pin), TSSOP-8 package, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers in space-constrained industrial designs.
Technical Context
The 93LC66BT-I/MNY implements a synchronous serial interface with start-bit detection, opcode-driven command set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and hardware-level data protection via VCC monitoring (POR threshold at 1.5 V). Its internal logic decodes instructions on rising CLK edges while maintaining High-Z DO during standby and instruction setup.
It supports sequential read mode when CS remains high, uses dummy-zero prefix for 8-bit output timing, and provides device status polling via DO pin after minimum TCSL (250 ns) - enabling host software to avoid fixed delays during write/erase operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin required, simplifies PCB layout vs. configurable variants. |
| VCC Range | 2.5 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifters. |
| Clock Frequency | Up to 3 MHz at VCC ≥ 4.5 V; down to 1 MHz at 1.8 V - enables high-speed writes in 5 V systems, robust operation in low-power 2.5 V applications. |
| Write Cycle Time | 6 ms typical (TWC) - defines minimum time between successive WRITE commands; impacts firmware timeout design. |
| Endurance | 1,000,000 erase/write cycles - ensures >10 years of daily reconfiguration in field-deployed industrial controllers. |
| Data Retention | 200 years at 25°C - guarantees nonvolatile storage integrity across product lifecycle without refresh. |
| Standby Current | 1 µA (I-temp) - enables battery-backed operation in always-on sensor nodes with multi-year shelf life. |
Pinout & Package
93LC66BT-I/MNY is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, Pb-free Matte Tin finish, and exposed pad optional grounding per Microchip packaging spec.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed programming on falling edge (93LC series). |
| CLK | Serial Clock | Synchronizes all data transfers; opcodes, addresses, and data clocked in on rising edge; stoppable mid-sequence. |
| DI | Data Input | Receives start bit, opcode, address, and write data; shares no internal bus conflict with DO in standard use. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS fall; requires TCSL before status polling. |
| VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling into serial interface. |
| NC | No Connect | Pin 7 in TSSOP - internally unconnected; must be left floating or tied to VSS per layout best practice. |
| VCC | Power Supply | Supplies core logic and memory array; POR circuit disables writes below 1.5 V to prevent corruption during brown-out. |
| ORG | Organization Select | Not present on 93LC66B - this variant is dedicated 16-bit; 93LC66BT-I/MNY is *A-series*, so ORG is NC (not bonded). |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or firmware delay loops - host polls DO pin for completion instead. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data remnants without requiring separate ERAL command. |
| Power-On/Off Data Protection | VCC monitor disables write/erase below 1.5 V - prevents partial writes during power ramp-up/down in unregulated supplies. |
| Industry Standard 3-Wire Serial I/O | Direct drop-in replacement for legacy Microwire EEPROMs; compatible with existing SPI-like controller firmware using CS/CLK/DI/DO signals. |
| Device Status Signal (Ready/Busy) | Enables deterministic host polling instead of fixed worst-case delays - reduces average write latency by up to 40% in burst-write scenarios. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-calibrated ADC offset/gain coefficients and user-adjusted trim values in HVAC temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime calibration updates via MCU's Microwire peripheral. Use Value: Maintains accuracy over 200-year retention; 1M endurance supports field recalibration every 3 months for 27+ years. | Use Scenario: Saving user-selected wash cycle parameters (temperature, spin speed, delay start) in front-load washing machines. IC Role / Device Role / Timing Role: Persistent settings store with fast 6 ms write time and 1 µA standby current to extend battery backup life. Use Value: Enables instant resume after power loss; low VCC range (2.5–5.5 V) interfaces directly with 3.3 V appliance MCU without regulator overhead. |
| Medical Device Settings | Automotive Body Control Module |
Use Scenario: Recording default therapy modes and clinician-configured limits in portable infusion pumps. IC Role / Device Role / Timing Role: Secure parameter vault accessed only during setup; protected by EWEN/EWDS lock sequence to prevent accidental overwrite. Use Value: Meets IEC 62304 safety requirements via hardware write-disable; POR circuit blocks writes during brown-out events. | Use Scenario: Storing seat position memory, mirror angle presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: EEPROM node on LIN or local MCU bus; operates across –40°C to +85°C ambient with guaranteed 2.5 V min VCC. Use Value: Industrial temp grade ensures reliability in under-hood environments; TSSOP-8 footprint minimizes PCB area vs. SOIC. |
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/SN | SOIC-8 package (5.3 mm × 4.4 mm), same 512 × 8-bit organization, identical electrical specs and timing. | Requires larger PCB footprint; better thermal dissipation and hand-solderability than TSSOP. | Select for prototyping, through-hole assembly, or where reflow profile limits TSSOP use. |
| AT25040B-MAHL-T | 4 Kbit SPI interface (4-wire), 1.8–5.5 V VCC, 20 MHz max clock, different command set and status reporting. | Requires SPI controller support instead of Microwire; no built-in ERAL-before-WRAL automation. | Select when migrating to higher-speed SPI infrastructure or consolidating with other Atmel SPI EEPROMs. |
Compared with 93LC66B-I/SN, the 93LC66BT-I/MNY saves 40% board area in high-density layouts; versus AT25040B-MAHL-T, it reduces firmware complexity by eliminating manual ERAL sequencing but trades off maximum clock speed.
Availability
93LC66BT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device settings requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93LC66BT-I/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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing reliable nonvolatile storage with minimal pin count and firmware overhead.
FAQ
What is the memory organization of the 93LC66BT-I/MNY?
The 93LC66BT-I/MNY has a fixed 512 × 8-bit organization. It is an 'A'-series device, meaning it does not use the ORG pin and is dedicated to 8-bit word access - unlike 'C'-series variants which support selectable 8/16-bit modes. This simplifies interface design and eliminates external ORG pull-up/pull-down components.
Does the 93LC66BT-I/MNY require an external pull-up resistor on the DO pin?
No, the 93LC66BT-I/MNY does not require an external pull-up on DO. The DO pin actively drives high/low during read or status polling and enters High-Z when deselected (CS low) or idle. External pull-ups may interfere with valid low-level signaling and are unnecessary per Microchip's recommended interface schematic.
What is the minimum VCC required for reliable write operation of the 93LC66BT-I/MNY?
The 93LC66BT-I/MNY requires VCC ≥ 2.5 V for all operations, including write. Its power-on reset (POR) circuit disables write/erase functions below 1.5 V to prevent data corruption - but functional write capability begins only at 2.5 V, as specified in the Device Selection Table and DC Characteristics (D11).
How is the Ready/Busy status checked on the 93LC66BT-I/MNY?
The Ready/Busy status is read from the DO pin: DO = low indicates ongoing erase/write; DO = high means operation complete. To poll correctly, CS must be brought high for ≥250 ns after TCSL, then sampled on CLK rising edges. Issuing a Start bit followed by CS low clears the status flag.
Is the 93LC66BT-I/MNY RoHS compliant and Pb-free?
Yes, the 93LC66BT-I/MNY is Pb-free and RoHS compliant, with Matte Tin (Sn) finish on all leads. This is confirmed in the Features section of DS21795E and supported by Microchip's packaging specification documents for TSSOP-8 (ST package code).
93LC66BT-I/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:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93LC66BT-I/MNY FAQ
1.How can I place an order for 93LC66BT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-I/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 93LC66BT-I/MNY reliable?
The price and inventory of 93LC66BT-I/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66BT-I/MNY is usually 5 days.
3.What payment methods are accepted for 93LC66BT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-I/MNY?
93LC66BT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-I/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 93LC66BT-I/MNY?
For technical support, including 93LC66BT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-I/MNY requirements.
6.How does Aetrix verify that 93LC66BT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-I/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 93LC66BT-I/MNY meets industry standards.
7.What is the process for return or replacement of 93LC66BT-I/MNY?
All 93LC66BT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-I/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 93LC66BT-I/MNY part is unused and in its original packaging.
Return procedure for 93LC66BT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66BT-I/MNY Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
