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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 93LC66-I/SL

Name: 93LC66-I/SL
Brand: Microchip Technology
SKU: 93LC66-I/SL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 93LC66-I/SL

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: 93LC66-I/SL.pdf

Description:: IC EEPROM 4KBIT MICROWIRE 14SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:402

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Product details

Overview

93LC66-I/SL from Microchip Technology is a 4-kbit serial EEPROM organized as 256 × 16, operating from 2.5V to 5.5V with Microwire-compatible 3-wire serial interface (CS, SK, DI/DO), 1 MHz max clock rate, and 1 million erase/write cycles. It supports sequential and random read/write, used in industrial control panels for parameter storage and calibration data retention.

For engineers reviewing the 93LC66-I/SL datasheet, 93LC66-I/SL pinout, 93LC66-I/SL application, or 93LC66-I/SL equivalent, key selection criteria include voltage range compatibility, Microwire protocol support, endurance rating, and SOIC-8 package footprint for space-constrained embedded designs.

Technical Context

The 93LC66-I/SL implements a synchronous serial interface compliant with Microwire architecture, using command opcodes (e.g., 11b for write enable, 01b for read) transmitted on the DI line during rising SK edges. Internal address latching and auto-increment logic enable sequential access without repeated address loading.

It integrates a write-protect mechanism via ORG pin configuration (ORG = V_SS selects 256 × 16 organization; ORG = V_CC selects 512 × 8), and includes an internal write-timer ensuring reliable byte/page programming within 5 ms typical.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4 kbit (256 × 16-bit organization)
Supply Voltage	2.5V to 5.5V - supports mixed-voltage systems including 3.3V and 5V microcontrollers
Interface Protocol	Microwire-compatible 3-wire serial (CS, SK, DI/DO) - no I²C or SPI hardware required
Max Clock Frequency	1 MHz - enables fast parameter updates without CPU overhead in real-time control loops
Endurance	1,000,000 erase/write cycles - suitable for field-updatable calibration tables with frequent revision
Data Retention	200 years at +25°C - ensures long-term validity of stored configuration across product lifecycle

Pinout & Package

93LC66-I/SL is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 150-mil body width, surface-mount compatible, and RoHS-compliant lead finish.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select Input	Active-low enable for serial communication; must be held low during instruction and data transfer
SK	Serial Clock Input	Synchronizes data sampling on rising edge; controls timing of command, address, and data bits
DI	Data Input	Carries command opcodes, address bits, and write data; sampled on rising SK edge
DO	Data Output	Provides read data and status bits; driven only when CS is active and instruction is read
ORG	Organization Select	Configures memory map: grounded = 256 × 16; tied to V_CC = 512 × 8
V_SS	Ground	Reference return path for all digital and internal circuitry
V_CC	Power Supply	Primary supply input; regulates internal charge pump for write operations
NC	No Connect	Internally unconnected pin; must remain floating or tied to ground per layout guidelines

Key Features

Feature	Design Value
Single-supply operation	Eliminates need for dual-rail or external voltage translators in 3.3V/5V mixed-signal systems
Hardware write protection	Prevents accidental overwrites via ORG pin state and internal WP latch, reducing firmware validation burden
Page write capability	Enables up to 16-byte burst writes per command, cutting update time by 80% vs. byte-wise programming
Low-power standby current	1 μA typical - extends battery life in portable diagnostic tools with infrequent configuration changes

Applications

Industrial Sensor Calibration	Medical Device Configuration
Use Scenario: Storing temperature compensation coefficients and sensor offset values in factory-calibrated pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile parameter register providing deterministic startup behavior after power cycle. Use Value: Maintains traceable calibration history across device lifetime without external backup power or supercapacitors.	Use Scenario: Holding user-selected therapy parameters and safety limits in portable infusion pumps. IC Role / Device Role / Timing Role: Secure configuration store accessed only during initialization or clinician setup mode. Use Value: Ensures regulatory compliance with IEC 62304 by guaranteeing persistent, tamper-resistant settings.
Automotive Body Control Module	Consumer Appliance Settings Storage
Use Scenario: Saving mirror position presets and door lock preferences in OEM BCMs. IC Role / Device Role / Timing Role: Dedicated EEPROM for user-specific feature persistence across ignition cycles. Use Value: Delivers guaranteed 200-year data retention under automotive thermal cycling (−40°C to +125°C ambient).	Use Scenario: Retaining cooking mode defaults and child-lock status in smart ovens. IC Role / Device Role / Timing Role: Low-cost, pin-efficient nonvolatile memory interfaced directly to 8-bit MCU GPIOs. Use Value: Reduces BOM count by eliminating discrete level shifters needed for I²C/SPI alternatives.

Industrial Sensor Calibration

Medical Device Configuration

Use Scenario: Storing temperature compensation coefficients and sensor offset values in factory-calibrated pressure transducers.

IC Role / Device Role / Timing Role: Nonvolatile parameter register providing deterministic startup behavior after power cycle.

Use Value: Maintains traceable calibration history across device lifetime without external backup power or supercapacitors.

Use Scenario: Holding user-selected therapy parameters and safety limits in portable infusion pumps.

IC Role / Device Role / Timing Role: Secure configuration store accessed only during initialization or clinician setup mode.

Use Value: Ensures regulatory compliance with IEC 62304 by guaranteeing persistent, tamper-resistant settings.

Automotive Body Control Module

Consumer Appliance Settings Storage

Use Scenario: Saving mirror position presets and door lock preferences in OEM BCMs.

IC Role / Device Role / Timing Role: Dedicated EEPROM for user-specific feature persistence across ignition cycles.

Use Value: Delivers guaranteed 200-year data retention under automotive thermal cycling (−40°C to +125°C ambient).

Use Scenario: Retaining cooking mode defaults and child-lock status in smart ovens.

IC Role / Device Role / Timing Role: Low-cost, pin-efficient nonvolatile memory interfaced directly to 8-bit MCU GPIOs.

Use Value: Reduces BOM count by eliminating discrete level shifters needed for I²C/SPI alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT25040B-MAU-1.8	SPI interface, 1.8–5.5V supply, 20 MHz clock, 1M endurance	Requires SPI-capable MCU; higher speed but incompatible protocol stack	Select if existing design uses SPI peripherals and requires faster bulk writes
STK12C68-5LH1T	NVSRAM with 5V-only operation, 10-year retention, no page write	Supports SRAM-like random access with automatic STORE on power loss	Choose where instantaneous write reliability outweighs EEPROM endurance and cost

Compared with AT25040B-MAU-1.8 and STK12C68-5LH1T, the 93LC66-I/SL offers Microwire-native compatibility with minimal MCU resource usage, lower system-level component count, and superior endurance for high-frequency field updates-making it optimal for cost-sensitive, low-pin-count embedded controllers.

Availability

93LC66-I/SL is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply and long-term obsolescence management.

Supply support for 93LC66-I/SL 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.

The 93LCxx family was designed specifically for low-pin-count, low-power serial EEPROM applications in resource-constrained microcontroller systems requiring simple, robust nonvolatile storage.

FAQ

What is the maximum clock frequency supported by the 93LC66-I/SL?

The 93LC66-I/SL supports a maximum serial clock (SK) frequency of 1 MHz at V_CC ≥ 4.5V, and 0.5 MHz at V_CC = 2.5V. This ensures reliable timing margin across its full 2.5V–5.5V operating range. The 93LC66-I/SL uses edge-triggered sampling synchronized to SK rising edges, making it compatible with standard GPIO bit-banging implementations in 8-bit MCUs without dedicated serial peripherals.

How does the ORG pin affect memory organization in the 93LC66-I/SL?

The ORG pin on the 93LC66-I/SL selects between two memory maps: when tied to V_SS, it configures the device as 256 words × 16 bits; when tied to V_CC, it configures as 512 words × 8 bits. This setting is latched at power-on and remains fixed until reset. The 93LC66-I/SL does not support dynamic reconfiguration - the ORG state determines address width and data bus width for all subsequent operations.

Does the 93LC66-I/SL require external components for write protection?

No, the 93LC66-I/SL includes internal hardware write protection controlled by the ORG pin state and a dedicated Write Enable Latch (WEL). Once write protection is enabled via the WREN instruction, all subsequent write commands are blocked until WREN is reissued. The 93LC66-I/SL also supports software write protection through status register bits, eliminating need for external jumpers or resistors in most designs.

What is the typical write time for a full page in the 93LC66-I/SL?

A full page (16 bytes) write in the 93LC66-I/SL completes in 5 ms typical, with a maximum of 10 ms over temperature and voltage extremes. This includes internal auto-erase and programming cycles. The 93LC66-I/SL supports both byte and page write modes, and the page write function reduces total update time significantly compared to sequential byte writes - especially critical in time-sensitive calibration workflows.

Is the 93LC66-I/SL compatible with I²C or SPI microcontrollers?

The 93LC66-I/SL is not natively compatible with I²C or SPI protocols. It uses a proprietary Microwire-compatible 3-wire interface (CS, SK, DI/DO) with distinct command encoding and timing. While some SPI-capable MCUs can emulate Microwire via GPIO bit-banging, dedicated SPI or I²C EEPROMs like the 24AA04 or AT25040B require different drivers and pin assignments. The 93LC66-I/SL must be interfaced using its defined Microwire protocol sequence.

93LC66-I/SL Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 4Kbit

Memory Organization:: 256 x 16, 512 x 8

Memory Interface:: Microwire

Clock Frequency:: 2 MHz

Write Cycle Time - Word, Page:: 10ms

Access Time:: 500 ns

Voltage - Supply:: 2.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

93LC66-I/SL FAQ

1.How can I place an order for 93LC66-I/SL through Aetrix?

Please submit a Request for Quotation (RFQ) for 93LC66-I/SL 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 93LC66-I/SL reliable?

The price and inventory of 93LC66-I/SL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66-I/SL is usually 5 days.

3.What payment methods are accepted for 93LC66-I/SL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66-I/SL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 93LC66-I/SL?

93LC66-I/SL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 93LC66-I/SL 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 93LC66-I/SL?

For technical support, including 93LC66-I/SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66-I/SL requirements.

6.How does Aetrix verify that 93LC66-I/SL is sourced from the original manufacturer or authorized distributors?

All 93LC66-I/SL 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 93LC66-I/SL meets industry standards.

7.What is the process for return or replacement of 93LC66-I/SL?

All 93LC66-I/SL units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66-I/SL, 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 93LC66-I/SL part is unused and in its original packaging.

Return procedure for 93LC66-I/SL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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