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Microchip Technology 93LC66BXT/SN
- Part No.:
- 93LC66BXT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BXT/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
93LC66BXT/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with dedicated 16-bit organization, 256 × 16-bit memory array, 2.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It uses Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO) and supports self-timed erase/write cycles for embedded configuration storage in microcontroller systems.
For engineers reviewing the 93LC66BXT/SN datasheet, 93LC66BXT/SN pinout, 93LC66BXT/SN application, or 93LC66BXT/SN equivalent, key selection criteria include 16-bit word access, 6 ms program cycle time, Ready/Busy status signaling via DO, VCC-dependent power-on protection (1.5 V threshold), and compatibility with SOIC-8 (SN) packaging for legacy PCB layouts.
Technical Context
The 93LC66BXT/SN implements a synchronous serial Microwire interface with fixed 16-bit word organization-no ORG pin required-enabling deterministic address/data framing without external configuration logic. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are initiated by a Start bit followed by opcode, address, and data bits clocked on CLK rising edges.
It features hardware-level data protection: automatic power-on reset disables write operations below 1.5 V VCC, and Erase/Write Enable (EWEN) must precede any programming command. The DO pin serves dual function-serial data output during READ and active-low Ready/Busy indicator during erase/write cycles-with status valid within 200 ns after CS high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit organization) |
| VCC operating range | 2.5 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V systems |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent calibration or runtime parameter updates |
| Data retention | 200 years at 25°C - ensures long-term nonvolatile storage without refresh |
| Program cycle time | 6 ms - defines minimum interval between successive WRITE/ERASE commands |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - sets maximum SPI-like throughput for configuration reads/writes |
| Standby current | 1 µA at I-temp - enables ultra-low-power retention in battery-backed applications |
Pinout & Package
93LC66BXT/SN is packaged in 8-lead SOIC (SN) per JEDEC MS-012, with gull-wing leads, 1.27 mm pitch, and Pb-free Matte Tin finish. Pin 1 marked by laser dot or notch.
| 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 | Synchronizes all data transfers on rising edge; clock may pause mid-transfer without error |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; no internal pull-up |
| DO | Data Output / Status | Outputs read data or active-low Ready/Busy; enters High-Z when CS low or during standby |
| VSS | Ground | Reference for all digital and analog functions; requires low-impedance connection |
| NC | No Connection | Pin 7 is unconnected internally - must be left floating or tied to VSS per layout best practice |
| VCC | Power Supply | Supplies core logic and memory array; bypass capacitor (0.1 µF) required near pin |
| ORG | Organization Select | Not present on 93LC66B - permanently configured for 16-bit mode; pin 6 is NC |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - internal state machine manages auto-erase before write |
| Automatic ERAL before WRAL | WRAL instruction includes full-array erase - no separate ERAL command needed for bulk reprogramming |
| Ready/Busy status on DO | Enables polling-based firmware flow control without additional GPIO or interrupt lines |
| Power-on data protection | VCC detect circuitry blocks writes below 1.5 V - prevents corruption during brown-out or power ramp |
| Industry-standard 3-wire interface | Direct drop-in replacement for legacy Microwire EEPROMs; minimal driver changes required |
Applications
| Industrial Sensor Calibration | Consumer Remote Control Memory |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and linearization tables in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed once at power-up; 16-bit word size matches typical ADC register width. Use Value: Eliminates external trimming components and enables field recalibration via host MCU without hardware modification. | Use Scenario: Retaining user-programmed channel presets, volume levels, and IR code learning history in universal remotes. IC Role / Device Role / Timing Role: Low-power backup memory updated infrequently; standby current ≤1 µA extends coin-cell life. Use Value: Supports >1M write cycles - exceeds expected lifetime of consumer device even with daily reprogramming. |
| Automotive Body Control Module | Medical Infusion Pump Settings |
Use Scenario: Saving seat/mirror position memory, lighting profiles, and door lock preferences in 12 V automotive systems. IC Role / Device Role / Timing Role: EEPROM interfaced to 8-bit MCU via bit-banged Microwire; operates across –40°C to +85°C ambient. Use Value: 2.5–5.5 V VCC range accommodates automotive battery fluctuations without level-shifting circuitry. | Use Scenario: Storing drug library parameters, dosage limits, and alarm thresholds in battery-powered portable infusion pumps. IC Role / Device Role / Timing Role: Safety-critical configuration store requiring guaranteed 200-year data retention and write-protection during power loss. Use Value: Hardware VCC detect (1.5 V threshold) and EWEN/EWDS commands prevent accidental overwrite during brown-out events. |
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 | Same 256×16-bit organization, identical SOIC-8 package, but marked without 'XT' suffix - same electrical specs and timing | No functional difference; 'XT' denotes tape-and-reel packaging variant, not performance or reliability divergence | Select 93LC66BXT/SN for automated SMT assembly; choose 93LC66B-I/SN only if loose parts or alternate reel specs required |
| AT25040B-MAU-10-T | 4 Kbit SPI EEPROM (512×8), 1.8–5.5 V, 20 MHz max clock, but uses 4-wire SPI (CS/CLK/MOSI/MISO) instead of Microwire | Requires different MCU peripheral (SPI vs. GPIO-bitbang) and firmware driver; no Ready/Busy pin - relies on WIP polling or fixed delays | Choose only if system already uses SPI peripherals and higher throughput (20 MHz vs. 3 MHz) justifies driver rewrite and layout change |
Compared with 93LC66B-I/SN, the 93LC66BXT/SN offers identical functionality in tape-and-reel form for SMT production; versus AT25040B-MAU-10-T, it retains Microwire compatibility and hardware Ready/Busy signaling at lower speed, reducing firmware complexity in resource-constrained MCUs.
Availability
93LC66BXT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical infusion pump settings requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93LC66BXT/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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66BXT/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring simple 3-wire nonvolatile storage without SPI overhead or complex initialization sequences.
FAQ
What is the memory organization of the 93LC66BXT/SN?
The 93LC66BXT/SN has a fixed 256 × 16-bit organization - meaning 256 words of 16 bits each, totaling 4 Kbit. Unlike 'C' variants, it lacks an ORG pin and is permanently configured for 16-bit operation, simplifying hardware design by eliminating external configuration logic.
Does the 93LC66BXT/SN require an external pull-up resistor on the DO pin?
No, the 93LC66BXT/SN does not require an external pull-up on DO. The pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when CS is low or during standby. A pull-up may cause bus contention if DI and DO are shorted in shared-bus configurations.
What is the minimum VCC voltage required to enable write operations on the 93LC66BXT/SN?
The 93LC66BXT/SN requires VCC ≥ 1.5 V to exit hardware write-protection mode. Below this threshold, all erase/write instructions (WRITE, ERASE, WRAL, ERAL) are blocked regardless of EWEN status - ensuring data integrity during power ramp-up or brown-out conditions.
How is the Ready/Busy status signaled on the 93LC66BXT/SN?
The 93LC66BXT/SN signals Ready/Busy status on the DO pin: DO = low indicates ongoing erase/write operation; DO = high indicates completion. Status is valid only when CS is brought high after ≥250 ns low time (TCSL); issuing a Start bit then lowering CS clears the status flag.
Can the 93LC66BXT/SN be used in place of a 93LC66A part in an existing design?
No - the 93LC66BXT/SN is not a direct replacement for 93LC66A. While both share the same package and pinout, the 93LC66A uses 512 × 8-bit organization and expects 8-bit data transfers, whereas the 93LC66BXT/SN uses 256 × 16-bit organization and requires 16-bit data framing. Firmware and address mapping must be revised.
93LC66BXT/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:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66BXT/SN FAQ
1.How can I place an order for 93LC66BXT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BXT/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 93LC66BXT/SN reliable?
The price and inventory of 93LC66BXT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66BXT/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BXT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BXT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BXT/SN?
93LC66BXT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BXT/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 93LC66BXT/SN?
For technical support, including 93LC66BXT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BXT/SN requirements.
6.How does Aetrix verify that 93LC66BXT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BXT/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 93LC66BXT/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BXT/SN?
All 93LC66BXT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BXT/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 93LC66BXT/SN part is unused and in its original packaging.
Return procedure for 93LC66BXT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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