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Microchip Technology 93LC76-I/SN
- Part No.:
- 93LC76-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC76-I/SN.pdf
- Description:
- IC EEPROM 8KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,051
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Product details
Overview
93LC76-I/SN from Microchip Technology is an 8K-bit (1024 × 8 or 512 × 16) low-voltage serial EEPROM with Microwire interface, operating down to 2.5V, featuring 1 mA typical active current, 5 µA standby current at 3.0V, and 1,000,000 erase/write cycles - used for nonvolatile parameter storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC76-I/SN datasheet, 93LC76-I/SN pinout, 93LC76-I/SN application, or 93LC76-I/SN equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, x8/x16 organization control via ORG pin, self-timed erase/write timing, and real-world use cases in industrial sensor calibration and power-up configuration retention.
Technical Context
The 93LC76-I/SN implements a synchronous 3-wire Microwire-compatible serial interface with CS, CLK, and bidirectional DI/DO lines. It supports dual memory organizations selected by the ORG pin: 1024 × 8-bit (ORG = VSS) or 512 × 16-bit (ORG = VCC), with internal pull-up enabling x16 default when unconnected.
Operation requires Erase/Write Enable (EWEN) before programming; all erase/write cycles are self-timed and include automatic ERAL prior to WRAL. Ready/Busy status is signaled via DO pin during erase/write, with TWC = 5 ms (typical), TEC = 15 ms (max), and TWL = 30 ms (max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1024 × 8 or 512 × 16), selectable via ORG pin - enables flexible byte- or word-oriented data storage |
| Supply voltage range | 2.5V to 6.0V - supports direct interfacing with 3.3V and 5V microcontrollers without level shifting |
| Interface type | 3-wire Microwire serial (CS, CLK, DI/DO) - minimal GPIO usage, compatible with legacy PIC® and 8051 controllers |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable calibration or logging applications |
| Data retention | 200+ years at 25°C - guarantees persistent storage across product lifetime without refresh |
| Operating temperature | −40°C to +85°C (Industrial grade) - qualified for deployment in harsh environmental conditions |
| Max clock frequency | 3 MHz at VCC ≥ 4.5V; 2 MHz at 2.5V ≤ VCC < 4.5V - defines maximum throughput for sequential read/write bursts |
Pinout & Package
8-pin SOIC package (150 mil body width), surface-mount compatible, RoHS-compliant, with standard lead pitch of 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates Standby mode when deasserted |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; stops freely during transmission; not required during self-timed write |
| DI | Data Input | Receives Start bit, opcode, address, and write data; shares net with DO only if bus conflict mitigation is implemented |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters high-Z on CS falling edge; requires external pull-up for reliable status polling |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance connection |
| ORG | Memory Organization | Selects 1024×8 (VSS) or 512×16 (VCC); internal pull-up defaults to x16 when floating |
| PE | Program Enable | Enables write when VCC or floating (internal pull-up); disables all programming when tied to VSS |
| VCC | Power Supply | 2.5–6.0V supply; includes on-chip power-on/power-off protection that inhibits programming below 1.4V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - simplifies firmware by removing cycle-counting or delay loops |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents partial writes and data corruption in system recovery routines |
| Power-on/off data protection | Hardware-enforced lockout below 1.4V - prevents inadvertent writes during brown-out or reset sequences |
| Sequential read function | Auto-incrementing address pointer while CS remains high - enables efficient block reads with minimal host CPU overhead |
| Device status signal (DO) | Real-time Ready/Busy feedback via same pin used for data - reduces pin count and eliminates need for dedicated status lines |
Applications
| Industrial Sensor Calibration | Microcontroller Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated coefficients and offset values for temperature, pressure, and humidity sensors deployed in HVAC or process control systems. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot or periodic recalibration; x16 mode optimizes coefficient packing efficiency. Use Value: Enables field-replaceable sensor modules with unique calibration data retained across power cycles and firmware updates. |
Use Scenario: Holding user-configurable settings (baud rate, I/O mapping, alarm thresholds) in programmable logic controllers and HMI panels. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU SPI/Microwire peripheral; PE pin hardwired to VCC for runtime write-enable. Use Value: Supports zero-touch commissioning and remote reconfiguration without requiring flash reprogramming or physical access. |
| Power-Up State Initialization | Firmware Patch Storage |
Use Scenario: Restoring last-known operational state (motor position, valve duty cycle, display brightness) after unexpected AC loss or battery depletion. IC Role / Device Role / Timing Role: Fast-read EEPROM accessed within first 10 ms of VCC ramp; x8 mode aligns with byte-addressed MCU register maps. Use Value: Eliminates mechanical reset switches and improves perceived system responsiveness during cold start. |
Use Scenario: Storing small critical firmware patches or security keys updated over-the-air in medical or industrial gateways. IC Role / Device Role / Timing Role: Secure patch repository with EWEN/EWDS controlled by trusted bootloader; WRAL used for atomic full-image update. Use Value: Enables field-deployable fixes without full firmware reflashing or device downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC76C-I/SN | Same pinout and instruction set; improved ESD rating (6 kV vs. 4 kV) and tighter tPD spec (100 ns max vs. 250 ns) | Better suited for high-noise factory automation environments requiring enhanced robustness | Drop-in replacement where higher ESD immunity and faster output response are required |
| AT25080B-MAU-10 | 8K-bit SPI interface (not Microwire); 2.5–5.5V supply; 5 MHz max clock; no ORG pin - fixed 1024×8 organization | Requires SPI-capable host; lacks x16 mode and WRAL/ERAL commands; uses standard SPI CS/CLK/MOSI/MISO | Preferred when migrating to SPI-based platforms or consolidating across Atmel/Dialog portfolio |
Compared with 93LC76-I/SN, the 93LC76C-I/SN offers enhanced reliability without layout changes, while AT25080B-MAU-10 shifts interface architecture and removes organization flexibility - both require validation of timing margins and command sequence compatibility in existing firmware.
Availability
93LC76-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, microcontroller configuration storage, and power-up state initialization requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93LC76-I/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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC76-I/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing simple, robust nonvolatile storage with minimal pin count and firmware overhead.
FAQ
What is the memory organization flexibility of the 93LC76-I/SN?
The 93LC76-I/SN supports two memory configurations via the ORG pin: 1024 × 8-bit when ORG = VSS, and 512 × 16-bit when ORG = VCC. An internal pull-up resistor selects x16 mode by default if ORG is left unconnected. This dual-mode capability allows the 93LC76-I/SN to adapt to either byte-oriented or word-oriented data structures without changing hardware layout.
How does the 93LC76-I/SN handle power transitions to prevent accidental writes?
The 93LC76-I/SN incorporates hardware-level power-on/power-off data protection that inhibits all erase/write operations when VCC falls below or rises above 1.4V. This ensures the 93LC76-I/SN remains in a safe, locked state during brown-out conditions or incomplete power ramps - eliminating risk of corruption even if CS or CLK glitches occur during supply instability.
What is the role of the PE pin on the 93LC76-I/SN?
The PE (Program Enable) pin on the 93LC76-I/SN provides hardware-level write protection: tying PE to VSS disables all programming functions permanently, while leaving it floating or connecting to VCC enables erase/write operations. The 93LC76-I/SN includes an internal pull-up, so PE defaults to enabled - making it safe for most designs unless explicit lockdown is required.
Can the 93LC76-I/SN perform sequential reads, and how is it implemented?
Yes, the 93LC76-I/SN supports sequential read: when CS remains high and clocking continues after a READ instruction, the internal address pointer auto-increments and outputs subsequent memory locations without reissuing the opcode. This feature reduces host MCU overhead and enables efficient block transfers - a key advantage of the 93LC76-I/SN in configuration loading and sensor log retrieval.
Is the 93LC76-I/SN still recommended for new designs?
No - the official Microchip datasheet (DS21131F) explicitly states "Not recommended for new designs" and recommends migration to the 93LC76C or 93LC86C variants. While the 93LC76-I/SN remains available and fully functional, new projects should evaluate the 93LC76C-I/SN for improved ESD performance and tighter AC timing specs, or consider modern SPI EEPROM alternatives for broader ecosystem support.
93LC76-I/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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC76-I/SN FAQ
1.How can I place an order for 93LC76-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC76-I/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-I/SN reliable?
The price and inventory of 93LC76-I/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-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC76-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC76-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC76-I/SN?
93LC76-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC76-I/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-I/SN?
For technical support, including 93LC76-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC76-I/SN requirements.
6.How does Aetrix verify that 93LC76-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC76-I/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-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC76-I/SN?
All 93LC76-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC76-I/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-I/SN part is unused and in its original packaging.
Return procedure for 93LC76-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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