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Microchip Technology 93LC76AT-I/SN
- Part No.:
- 93LC76AT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC76AT-I/SN.pdf
- Description:
- IC EEPROM 8KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,234
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Product details
Overview
93LC76AT-I/SN from Microchip Technology Inc. is an 8K-bit, 1024 × 8-bit organization serial EEPROM with Microwire-compatible 3-wire interface (CS/CLK/DI/DO), operating over 2.5–5.5 V supply and rated for -40°C to +85°C industrial temperature range. It features self-timed erase/write cycles (5 ms typical), 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 93LC76AT-I/SN datasheet, 93LC76AT-I/SN pinout, 93LC76AT-I/SN application, or 93LC76AT-I/SN equivalent, key selection considerations include its fixed 8-bit word size (no ORG pin), absence of PE/ORG pins (distinguishing it from 'C' variants), SOIC-8 package compatibility, and support for sequential read and Ready/Busy status polling via DO pin.
Technical Context
This device implements a synchronous serial Microwire interface with start-bit detection, opcode-driven command set (READ, WRITE, ERASE, EWEN/EWDS), and internal auto-erase-before-write logic. All programming requires prior execution of EWEN; power-up default is EWDS state.
It uses CMOS EEPROM cell technology with on-chip voltage regulation for write operations, supports clock frequencies up to 3 MHz at VCC ≥ 4.5 V, and provides DO pin status signaling (low = busy, high = ready) during erase/write when CS is reasserted after ≥250 ns low time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1024 × 8-bit organization; no ORG pin - fixed x8 mode) |
| Supply Voltage | 2.5 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level shifting |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI, DO) - minimal GPIO usage, no SPI mode bits required |
| Write Cycle Time | 5 ms typical - determines minimum time between successive write commands; impacts firmware timeout design |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telemetry or logging applications |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unattended infrastructure equipment |
| Temperature Range | -40°C to +85°C (Industrial grade) - validated for operation in factory automation and outdoor control panels |
Pinout & Package
8-lead SOIC (SN) package with standard 150-mil width; RoHS-compliant matte tin finish. Pin 1 marked by laser dot; pin 1 ID corner matches JEDEC MS-012AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion |
| 2 (CLK) | Serial Clock | Positive-edge synchronized timing for opcode/address/data; stoppable mid-sequence; no clocks needed during self-timed write |
| 3 (DI) | Data Input | Receives start bit, opcodes, addresses, and write data; shares no internal logic with DO - avoids bus conflict in shared-line designs |
| 4 (DO) | Data Output / Status | Outputs read data on rising CLK edge; signals Ready/Busy (low=busy) during erase/write when CS reasserted after TCSL |
| 5 (VSS) | Ground | Reference return path for all I/O and core logic; must be low-impedance connection to avoid noise-induced corruption |
| 6–7 | Not connected | No internal connection - left floating per datasheet; not used for ORG or PE (exclusive to 'C' variants) |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal POR circuit triggers at ~1.5 V - prevents spurious writes during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write with auto-erase | Eliminates need for external timing control or firmware delay loops; reduces host CPU overhead |
| Ready/Busy status via DO pin | Enables non-blocking polling instead of fixed delays - improves system responsiveness and determinism |
| Power-on/off data protection | Hardware-enforced write inhibition below VCC threshold (~1.5 V) - prevents corruption during power ramp |
| Sequential read capability | Allows continuous address increment with single CS assertion - speeds bulk read of configuration blocks |
| Erase/Write Enable/Disable (EWEN/EWDS) | Software-controlled write lockout - critical for preventing accidental overwrites in field-upgradable firmware |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during commissioning or maintenance; retains settings across power cycles. Use Value: Ensures deterministic startup behavior and eliminates manual reconfiguration after power loss - critical for uptime-sensitive production lines. | Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation tables in MEMS pressure or humidity sensors. IC Role / Device Role / Timing Role: Read-on-power-up memory providing calibration constants to ADC/digital signal processing firmware. Use Value: Enables high-accuracy measurements without requiring recalibration in the field - reduces service cost and extends product lifetime. |
| Medical Device Parameter Backup | Point-of-Sale Terminal Settings |
Use Scenario: Preserving user-adjustable therapy parameters (e.g., infusion rate limits, alarm volumes) in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, low-power storage element written only during clinician setup; read at boot and during runtime validation. Use Value: Meets IEC 62304 safety requirements for persistent data integrity - prevents hazardous misconfiguration due to memory corruption. | Use Scenario: Storing tax rates, receipt formatting rules, and peripheral device IDs in retail POS terminals subject to regional regulatory updates. IC Role / Device Role / Timing Role: Field-updatable configuration store accessed via host MCU during firmware update or cashier login. Use Value: Supports rapid compliance updates without hardware replacement - accelerates time-to-market for regional deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC76A-I/P | Same 1024×8-bit organization, 2.5–5.5 V, Industrial temp; PDIP-8 package instead of SOIC-8 | Through-hole mounting required; larger PCB footprint; no surface-mount assembly compatibility | Select for legacy through-hole designs or prototyping where socketing is preferred |
| AT25080B-SSHL-T | 8 Kbit SPI interface (4-wire), 1.8–5.5 V, same endurance and retention; no EWEN/EWDS command set | Requires SPI master instead of Microwire; lacks hardware write-protection enable/disable sequence | Select when migrating to SPI-based platforms or when simplified command protocol suffices |
Compared with 93LC76AT-I/SN, the 93LC76A-I/P offers identical electrical and functional behavior in a through-hole package, while the AT25080B-SSHL-T trades Microwire compatibility for broader SPI ecosystem support and lower minimum voltage - both require layout or firmware adaptation but deliver equivalent nonvolatile storage capability.
Availability
93LC76AT-I/SN is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and point-of-sale terminals requiring stable component supply and long-term obsolescence management.
Supply support for 93LC76AT-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 93LC76A series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable, low-power nonvolatile memory with simple 3-wire control.
FAQ
What is the memory organization of the 93LC76AT-I/SN?
The 93LC76AT-I/SN has a fixed 1024 × 8-bit (8 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and therefore does not support x16 mode - it operates exclusively in x8 configuration. This is confirmed in the Device Selection Table and Pin Function Table of DS21796M, where 'A' suffix denotes dedicated 8-bit organization.
Does the 93LC76AT-I/SN have Program Enable (PE) or ORG pins?
No, the 93LC76AT-I/SN does not include PE or ORG pins. As a member of the 'A' variant family, it omits both pins - they are present only on 'C' versions (e.g., 93LC76C). The SOIC-8 pinout for 93LC76AT-I/SN shows pins 6 and 7 as unconnected, consistent with the 'A' device definition in the Pin Function Table.
What is the maximum clock frequency supported by the 93LC76AT-I/SN?
The 93LC76AT-I/SN supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V, 2 MHz at 2.5 V to 4.5 V, and 1 MHz at 1.8 V to 2.5 V. However, since its minimum VCC is 2.5 V, the applicable range is 1–2 MHz (2.5–4.5 V) and 2–3 MHz (4.5–5.5 V), per Table 1-2 AC Characteristics in DS21796M.
How is write protection implemented on the 93LC76AT-I/SN?
Write protection on the 93LC76AT-I/SN is implemented exclusively via the Erase/Write Enable/Disable (EWEN/EWDS) command sequence. Unlike 'C' variants, it has no hardware PE pin. The device powers up in EWDS state; an EWEN instruction must precede any ERASE or WRITE command, and EWDS should follow to relock - this software-based method prevents accidental writes during normal operation.
What package type and lead count does the 93LC76AT-I/SN use?
The 93LC76AT-I/SN uses an 8-lead SOIC (Small Outline Integrated Circuit) package, designated 'SN' in Microchip's packaging nomenclature. Its dimensions conform to JEDEC MS-012AA, 150-mil body width, with matte tin (Pb-free) finish - verified in the Package Types diagram and Packaging Information section of DS21796M.
93LC76AT-I/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:
- 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
93LC76AT-I/SN FAQ
1.How can I place an order for 93LC76AT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC76AT-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 93LC76AT-I/SN reliable?
The price and inventory of 93LC76AT-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 93LC76AT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC76AT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC76AT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC76AT-I/SN?
93LC76AT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC76AT-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 93LC76AT-I/SN?
For technical support, including 93LC76AT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC76AT-I/SN requirements.
6.How does Aetrix verify that 93LC76AT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC76AT-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 93LC76AT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC76AT-I/SN?
All 93LC76AT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC76AT-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 93LC76AT-I/SN part is unused and in its original packaging.
Return procedure for 93LC76AT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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