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Microchip Technology 93LC76A-I/SN
- Part No.:
- 93LC76A-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC76A-I/SN.pdf
- Description:
- IC EEPROM 8KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,192
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Product details
Overview
93LC76A-I/SN from Microchip Technology Inc. is an 8Kbit, 1024 × 8-bit serial EEPROM with Microwire-compatible 3-wire interface (CS, CLK, DI/DO), operating over 2.5–5.5V supply and rated for -40°C to +85°C industrial temperature range. It features self-timed erase/write cycles, 1 million endurance cycles, >200-year data retention, and power-on/off data protection - deployed in embedded system configuration storage, sensor calibration memory, and industrial controller parameter backup.
For engineers reviewing the 93LC76A-I/SN datasheet, 93LC76A-I/SN pinout, 93LC76A-I/SN application, or 93LC76A-I/SN equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), absence of PE/ORG pins, SOIC-8 package compatibility, 3 MHz max clock at VCC ≥ 4.5V, and readiness for low-power, nonvolatile serial memory integration without external address latching.
Technical Context
This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, EWEN/EWDS), and Ready/Busy status output via DO pin during programming. It uses internal auto-erase before write and supports sequential read when CS remains high.
Memory access requires precise timing: minimum TCSL = 250 ns between instructions, TCKH/TCKL scaling with VCC (e.g., 200 ns/100 ns at 4.5–5.5V), and status polling enabled only after CS reassertion post-TCSL. Power-up defaults to EWDS mode, requiring explicit EWEN before any erase/write operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1024 × 8-bit organization; no ORG pin - fixed x8) |
| Supply voltage | 2.5–5.5 V - supports single-supply operation across 3.3V and 5V systems |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal pin count, no address bus required |
| Write endurance | 1,000,000 erase/write cycles - suitable for frequent field updates (e.g., metering logs) |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended equipment |
| Max clock frequency | 3 MHz at VCC ≥ 4.5V - enables fast configuration loading without MCU wait states |
| Operating temperature | -40°C to +85°C (Industrial grade) - validated for factory automation and outdoor control units |
Pinout & Package
8-lead SOIC (SN) package with standard 150-mil width; RoHS-compliant matte tin finish; pin 1 marked by laser dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands to reset internal logic |
| 2 CLK | Serial Clock | Positive-edge synchronized I/O; stops/resumes freely during transmission (TCKH/TCKL compliant) |
| 3 DI | Data Input | Receives start bit, opcodes, addresses, and write data; shares net with DO in bidirectional mode (requires series resistor) |
| 4 DO | Data Output / Status | Outputs read data on rising CLK edge; asserts low during erase/write to signal busy state |
| 5 VSS | Ground | Reference return path for all signals; must be low-impedance connection to avoid timing skew |
| 6 - | No connect | Not bonded; left floating - no external connection required |
| 7 - | No connect | Not bonded; left floating - no external connection required |
| 8 VCC | Power Supply | 2.5–5.5V input; includes internal POR circuit triggering at ~1.5V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - TWC = 5 ms typical, fully autonomous |
| Power-on/off data protection | Hardware-enforced write inhibition below VCC = 1.5V - prevents corruption during brown-out |
| Ready/Busy status signaling | Real-time DO pin feedback enables polling-based firmware flow control without fixed delays |
| Low standby current | 1 µA max at TA = 85°C - extends battery life in always-on sensor nodes |
| Sequential read mode | Continuous 8-bit output across addresses with single CS assertion - reduces host overhead |
Applications
| Industrial PLC Configuration Storage | Automotive Sensor Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile serial configuration memory interfaced to microcontroller SPI-like GPIO bit-banging. Use Value: Enables field-upgradable settings without firmware reflashing; survives 1M+ power cycles with guaranteed 200-year retention. | Use Scenario: Holding factory-trimmed offset/gain coefficients for pressure, temperature, and position sensors in engine control modules. IC Role / Device Role / Timing Role: Microwire EEPROM providing deterministic, low-pin-count calibration data storage accessible during boot. Use Value: Eliminates need for external address decoders; operates reliably across -40°C to +85°C with <1 µA standby draw. |
| Smart Meter Firmware Parameter Backup | Medical Device Usage Log Storage |
Use Scenario: Archiving tariff schedules, demand-response flags, and tamper-event timestamps in utility meters. IC Role / Device Role / Timing Role: Serial EEPROM used for infrequent but critical write operations with hardware write-protection fallback. Use Value: 1M endurance supports daily logging for >2700 years; self-timed writes prevent MCU timing lockup during power transitions. | Use Scenario: Recording sterilization cycles, usage counts, and error history in portable diagnostic instruments. IC Role / Device Role / Timing Role: Low-power nonvolatile memory interfaced to ARM Cortex-M0+ via software-controlled 3-wire protocol. Use Value: Meets IEC 60601-1 leakage current limits with 1 µA max ICCS; RoHS-compliant packaging satisfies medical regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC76B-I/SN | 16-bit organization (512 × 16); same pinout, voltage, temp, and timing - no ORG pin | Requires host-side 16-bit data handling; incompatible with existing 8-bit firmware interfaces | Select only if system architecture mandates 16-bit word access and memory map alignment |
| AT25080B-SSHL-T | SPI interface (4-wire), 8Kbit (1024 × 8), 2.5–5.5V, -40°C to +85°C, 20 MHz max clock | Requires additional CS and SO pins; faster throughput but higher pin count and layout complexity | Prefer when existing design uses SPI peripherals and demands >3 MHz write speed |
Compared with 93LC76B-I/SN, the 93LC76A-I/SN provides native 8-bit alignment without data packing; versus AT25080B-SSHL-T, it reduces GPIO count by one pin and simplifies firmware bit-banging - critical for resource-constrained 8-bit MCUs.
Availability
93LC76A-I/SN is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive sensor calibration memory, and smart meter firmware parameter backup requiring stable component supply across extended product lifecycles.
Supply support for 93LC76A-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC76A-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count nonvolatile memory applications in industrial and automotive systems where Microwire compatibility and robust data integrity are essential.
FAQ
What is the memory organization of the 93LC76A-I/SN?
The 93LC76A-I/SN has a fixed 1024 × 8-bit (8Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and does not support 16-bit mode. This simplifies host interface design by eliminating configuration dependency on external logic levels - all addressing and data transfers are strictly byte-oriented. The 93LC76A-I/SN delivers deterministic 8-bit read/write behavior across its full temperature and voltage range.
Does the 93LC76A-I/SN require an external pull-up resistor on the DO pin?
No, the 93LC76A-I/SN does not require an external pull-up on DO. Its DO pin is actively driven high or low during read/status phases and enters High-Z only when CS is low or during idle periods. However, if DI and DO are shorted for bidirectional use, a 1–10 kΩ series resistor is mandatory to prevent bus conflict when A0 = high during the dummy zero phase - this protects both the 93LC76A-I/SN and driving circuitry.
How is write protection implemented on the 93LC76A-I/SN?
The 93LC76A-I/SN uses command-based write protection: it powers up in Erase/Write Disable (EWDS) mode, blocking all erase/write operations until an EWEN instruction is issued. After programming, an EWDS command restores protection. Unlike 'C' variants, it has no PE pin - protection relies entirely on firmware-level instruction sequencing. This ensures accidental writes are prevented even during power transients, as confirmed by the 93LC76A-I/SN's built-in POR circuit.
What is the maximum clock frequency supported by the 93LC76A-I/SN at 3.3V?
At VCC = 3.3V (within 2.5–4.5V range), the 93LC76A-I/SN supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) of the datasheet. Timing margins remain valid down to 2.5V, enabling reliable operation in brown-out conditions. Exceeding 2 MHz at 3.3V violates TCKH/TCKL minima and risks command misinterpretation - the 93LC76A-I/SN will not function correctly above this limit.
Can the 93LC76A-I/SN be used in automotive applications requiring -40°C to +125°C?
No, the 93LC76A-I/SN is rated only for the Industrial temperature range (-40°C to +85°C), denoted by the 'I' suffix. For automotive AEC-Q100 compliance and operation up to +125°C, Microchip specifies the 93LC76A-E/SN variant ('E' grade). Using the 93LC76A-I/SN beyond +85°C risks parametric failure, including extended TWC, increased ICC, and potential data corruption - the 93LC76A-I/SN is not qualified or characterized for extended-temperature automotive deployment.
93LC76A-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
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- 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-SOIC
93LC76A-I/SN FAQ
1.How can I place an order for 93LC76A-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC76A-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 93LC76A-I/SN reliable?
The price and inventory of 93LC76A-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 93LC76A-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC76A-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC76A-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC76A-I/SN?
93LC76A-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC76A-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 93LC76A-I/SN?
For technical support, including 93LC76A-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC76A-I/SN requirements.
6.How does Aetrix verify that 93LC76A-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC76A-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 93LC76A-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC76A-I/SN?
All 93LC76A-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC76A-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 93LC76A-I/SN part is unused and in its original packaging.
Return procedure for 93LC76A-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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