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Microchip Technology 93LC76/SN
- Part No.:
- 93LC76/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC76/SN.pdf
- Description:
- IC EEPROM 8KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:483
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Product details
Overview
93LC76/SN from Microchip Technology Inc. is an 8K-bit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, configurable as 1024 × 8 or 512 × 16 organization via ORG pin, rated for 1,000,000 erase/write cycles and >200 years data retention, used in embedded system configuration storage and calibration data logging.
For engineers reviewing the 93LC76/SN datasheet, 93LC76/SN pinout, 93LC76/SN application, or 93LC76/SN equivalent, this page delivers verified electrical specs, validated SOIC-8 pin mapping, real-world use cases in industrial control and automotive subsystems, and two confirmed alternative parts with documented functional and timing differences.
Technical Context
The 93LC76/SN implements a self-timed Microwire protocol with Start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, WRAL, ERAL), and Ready/Busy status output on DO pin during programming. It uses internal address pointer auto-increment for sequential read and supports dual memory organizations selected by ORG pin voltage level.
Power management includes programmable write-protection via PE pin, power-on/off data protection circuitry, and standby current of 5 µA at 3.0V. All erase/write operations require prior EWEN command and are inhibited below VCC = 1.4V for robustness against brown-out conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1024 × 8 or 512 × 16 organization) |
| Interface | Microwire 3-wire serial (CS, CLK, DI/DO) |
| Supply voltage | 2.5V to 6.0V - enables direct integration into 3.3V and 5V systems without level-shifting |
| Write endurance | 1,000,000 cycles - supports frequent recalibration or event logging in field-deployed equipment |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended infrastructure applications |
| Max clock frequency | 3 MHz at VCC ≥ 4.5V - allows fast configuration loading during boot-up sequences |
| Standby current | 5 µA typical at 3.0V - minimizes quiescent power in battery-backed systems |
| Operating temperature | –40°C to +85°C (Industrial grade) - qualified for under-hood automotive and factory-floor environments |
Pinout & Package
8-pin SOIC package (150 mil body width), surface-mount compatible, RoHS-compliant, with standard JEDEC MS-012AC footprint.
| 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 | Synchronizes all bit transfers on rising edge; stoppable mid-sequence without corruption |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; tolerant of bus conflicts when shared with DO |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters high-Z on CS falling edge |
| VSS | Ground | Reference return path for all digital and analog functions; requires low-impedance PCB connection |
| PE | Program Enable | Internal pull-up enables programming if floating or tied to VCC; tie to VSS to permanently disable writes |
| VCC | Power Supply | 2.5–6.0V operation; built-in power-on protection inhibits programming until VCC > 1.4V |
| ORG | Organization Select | Tie to VCC for 512 × 16 mode; tie to VSS for 1024 × 8 mode; internal pull-up defaults to x16 |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - WRAL completes in ≤30 ms, ERAL in ≤15 ms |
| Automatic ERAL before WRAL | Guarantees clean memory state before bulk write, preventing partial-data corruption |
| Device status signal (DO) | Enables polling-based firmware flow control without interrupt overhead or timeout guesswork |
| Sequential read function | Reduces host CPU load by allowing continuous clocking while memory pointer auto-increments |
| Power-on/off data protection | Hardware-enforced write inhibition during voltage ramp-up/down prevents accidental erasure |
| Program Enable (PE) pin | Provides hardware-level write lock independent of software state - critical for safety-critical firmware |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module Calibration |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and fault history logs in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during startup and runtime via Microwire interface; supports infrequent writes but frequent reads. Use Value: 8K-bit capacity accommodates full parameter sets; 1M-cycle endurance ensures 10+ years of daily recalibration; –40°C to +85°C rating matches industrial ambient requirements. |
Use Scenario: Retaining seat position offsets, mirror angle presets, and lighting profiles across ignition cycles in automotive body control units. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to microcontroller's GPIO pins; powered from always-on 3.3V rail with PE pin grounded for permanent write protection after initial setup. Use Value: 5 µA standby current extends battery life during vehicle sleep mode; >200-year data retention guarantees settings survive vehicle lifetime; SOIC-8 footprint fits compact BCM PCB layouts. |
| Medical Device Calibration Data Archive | Smart Meter Firmware Parameter Backup |
Use Scenario: Archiving sensor calibration coefficients and usage counters in portable diagnostic equipment requiring regulatory traceability and long-term stability. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory storing NIST-traceable calibration constants; accessed only during service mode via dedicated test interface. Use Value: Hardware write-protection via PE pin prevents unauthorized modification; 1,000,000-cycle endurance supports repeated recalibration during device servicing; data retention exceeds FDA-mandated 15-year archival requirement. |
Use Scenario: Backing up tariff schedules, communication keys, and metering registers in utility smart meters deployed in outdoor enclosures with wide thermal swings. IC Role / Device Role / Timing Role: Primary configuration store interfaced to metering SoC; survives power loss during firmware updates and grid instability events. Use Value: Power-on protection circuitry prevents corruption during brown-out; SOIC-8 package withstands thermal cycling in outdoor-rated housings; 2.5V minimum VCC supports operation during capacitor hold-up periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC76C/SN | Pin-compatible revision with enhanced ESD rating (6 kV vs. 4 kV) and updated AC timing specs; same 8K-bit capacity and SOIC-8 package | Required for new designs per Microchip notice; supports higher noise immunity in industrial motor drives | Select 93LC76C/SN for production builds needing latest qualification and improved robustness |
| AT25080B-MAU-10 | 8K-bit SPI EEPROM (8-pin SOIC), 20 MHz max clock, no ORG pin - fixed 1024 × 8 organization; lacks WRAL/ERAL commands | Used where SPI interface is already standardized; unsuitable for legacy Microwire-only hosts or bulk-erase requirements | Choose AT25080B-MAU-10 only if migrating to SPI architecture and accepting loss of automatic erase-before-write functionality |
Compared with 93LC76/SN, the 93LC76C/SN offers verified drop-in compatibility and stronger ESD tolerance, while the AT25080B-MAU-10 requires interface redesign and forfeits WRAL/ERAL efficiency - making 93LC76C/SN the preferred upgrade path for continuity-critical deployments.
Availability
93LC76/SN is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive body control module calibration, and medical device calibration data archive requiring stable component supply across extended product lifecycles.
Supply support for 93LC76/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for embedded control applications.
The 93LC76/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-power systems requiring simple 3-wire serial configuration storage with hardware write protection and industrial-grade reliability.
FAQ
What is the maximum clock frequency supported by the 93LC76/SN?
The 93LC76/SN supports up to 3 MHz clock frequency when VCC is 4.5V to 6.0V, and up to 2 MHz when VCC is 2.5V to less than 4.5V. This dual-speed specification allows reliable operation across both 5V and 3.3V system rails without external clock dividers. The 93LC76/SN uses rising-edge sampling for all data transfers, and clock can be paused mid-sequence without affecting internal state.
How does the ORG pin affect memory organization in the 93LC76/SN?
In the 93LC76/SN, the ORG pin selects between two memory configurations: tying ORG to VCC configures the device as 512 × 16 (x16 mode), while tying it to VSS configures it as 1024 × 8 (x8 mode). An internal pull-up resistor defaults ORG to VCC, so x16 mode is active if the pin is left unconnected. This selection determines address width (9 bits for x16, 10 bits for x8) and data bus width per READ/WRITE cycle, directly impacting firmware addressing logic.
Does the 93LC76/SN require external circuitry for write protection?
No, the 93LC76/SN includes built-in hardware write protection via the PE (Program Enable) pin. When PE is tied to VSS, all erase and write operations are permanently disabled - even if EWEN is issued. With internal pull-up enabled, PE defaults to VCC, allowing normal programming. This eliminates need for external logic or fuse-based protection, simplifying design and improving security in tamper-prone environments. The 93LC76/SN also enforces power-on write inhibition until VCC exceeds 1.4V.
What is the purpose of the DO pin during erase and write operations in the 93LC76/SN?
In the 93LC76/SN, the DO pin serves dual function: during READ operations it outputs data bits, and during ERASE/WRITE cycles it signals Ready/Busy status - low indicates ongoing programming, high indicates completion. This allows firmware to poll DO synchronously with CS high, avoiding fixed delays or interrupts. The 93LC76/SN maintains this status until next Start bit is detected, enabling precise timing control for time-critical applications like bootloader parameter updates.
Is the 93LC76/SN compatible with modern Microchip development tools and programming adapters?
Yes, the 93LC76/SN is supported by Microchip's MPLAB ICD 4 and PICkit 4 programmers via compatible socket modules or SOIC-8 ZIF adapters, and is recognized in MPLAB X IDE v5.40+ with appropriate device file updates. Programming utilities such as PM3 and standalone EEPROM writers (e.g., TL866II+) also support the 93LC76/SN using its Microwire command set. However, Microchip explicitly notes "Not recommended for new designs" - users should verify toolchain compatibility with latest firmware versions before integrating 93LC76/SN into new projects.
93LC76/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8, 512 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 6.0V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC76/SN FAQ
1.How can I place an order for 93LC76/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC76/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 93LC76/SN reliable?
The price and inventory of 93LC76/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC76/SN is usually 5 days.
3.What payment methods are accepted for 93LC76/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC76/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC76/SN?
93LC76/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC76/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 93LC76/SN?
For technical support, including 93LC76/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC76/SN requirements.
6.How does Aetrix verify that 93LC76/SN is sourced from the original manufacturer or authorized distributors?
All 93LC76/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 93LC76/SN meets industry standards.
7.What is the process for return or replacement of 93LC76/SN?
All 93LC76/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC76/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 93LC76/SN part is unused and in its original packaging.
Return procedure for 93LC76/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC76/SN Tags
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