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Microchip Technology 93LC76AT-E/OT
- Part No.:
- 93LC76AT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93LC76AT-E/OT.pdf
- Description:
- IC EEPROM 8KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
93LC76AT-E/OT from Microchip Technology is an 8Kbit, low-voltage, serial EEPROM with 1024 × 8-bit organization, operating across 2.5–5.5V supply range and rated for automotive temperature (−40°C to +125°C). It features Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), self-timed erase/write cycles, and power-on/off data protection. It is used in automotive body control modules for storing calibration data and configuration parameters.
For engineers reviewing the 93LC76AT-E/OT datasheet, 93LC76AT-E/OT pinout, 93LC76AT-E/OT application, or 93LC76AT-E/OT equivalent, key selection considerations include its automotive-grade temperature rating, 8-bit fixed organization (no ORG pin), absence of PE/ORG pins, SOT-23-6 package constraints, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
The 93LC76AT-E/OT implements a synchronous serial Microwire interface with strict timing requirements: max clock frequency of 3 MHz at VCC ≥ 4.5V, TCKH/TCKL as low as 100 ns, and CS setup/hold times dependent on VCC. It uses a dedicated 8-bit memory map (1024 words) with no word-size configuration logic - unlike C-versions, it lacks ORG and PE pins entirely.
All operations - READ, WRITE, ERASE, EWEN/EWDS - are initiated via opcode-driven bitstream on DI synchronized to CLK rising edges. Ready/Busy status is polled via DO pin after CS reassertion; no interrupt or status register is provided. Write endurance is guaranteed at 1 million cycles with >200-year data retention at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1024 × 8-bit), fixed x8 organization - no runtime reconfiguration required |
| Supply voltage | 2.5–5.5 V - supports direct connection to 3.3 V or 5 V microcontroller I/O rails |
| Temperature grade | Automotive (−40°C to +125°C) - qualified per AEC-Q100 Class 2, suitable for under-hood ECUs |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals |
| Write endurance | 1,000,000 erase/write cycles - sufficient for firmware update logging or adaptive learning counters |
| Data retention | >200 years at 25°C - ensures long-term calibration storage without refresh |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - enables fast parameter reads in real-time control loops |
Pinout & Package
93LC76AT-E/OT is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (package code OT), measuring 2.9 mm × 1.6 mm × 1.1 mm. Pin 1 is marked by laser dot; orientation follows JEDEC MO-178 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Indicator | Tri-state output delivering read data or active-low busy signal during erase/write - requires external pull-up for reliable high-Z detection |
| 2 (VSS) | Ground Reference | Primary return path for all internal logic and I/O - must be low-impedance connection to system ground plane |
| 3 (DI) | Data Input | Serial input for opcodes, addresses, and write data - accepts standard CMOS logic levels; no internal pull-up |
| 4 (CLK) | Serial Clock Input | Synchronizes all bit transfers on rising edge - tolerant of clock pauses but requires min TCKH/TCKL per VCC |
| 5 (CS) | Chip Select Input | Active-high enable; device enters standby when low - must remain low ≥250 ns between commands |
| 6 (VCC) | Power Supply | Single-supply input supporting 2.5–5.5 V - includes internal POR circuit triggering at ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - WRAL completes in ≤15 ms, ERAL in ≤6 ms, no host CPU polling overhead |
| Power-on/off data protection | Hardware-enforced write inhibition below VCC threshold (~1.5 V) - prevents corruption during brown-out or hot-swap events |
| Sequential read mode | Enables continuous burst reads across address boundaries with single CS assertion - reduces transaction overhead by 40% vs. random access |
| Industry-standard Microwire interface | Direct drop-in replacement for legacy 93Cxx EEPROMs - no firmware changes needed for existing drivers |
| Pb-free & RoHS-compliant packaging | SOT-23-6 (OT) meets automotive soldering and environmental compliance requirements - compatible with lead-free reflow profiles |
Applications
| Engine Control Unit (ECU) Trim Storage | Automotive Door Module Configuration |
|---|---|
Use Scenario: Storing fuel injection timing trims and sensor offset corrections that persist across ignition cycles and battery disconnects. IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced directly to ECU's 3.3 V MCU via Microwire peripheral; accessed during startup and periodic recalibration. Use Value: Guarantees deterministic boot behavior and eliminates field failures due to lost calibration - leverages 1M-cycle endurance for lifetime learning updates. | Use Scenario: Holding window auto-up/down thresholds, mirror fold/unfold positions, and lock actuator timing profiles in door control units. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM sharing bus with LIN transceiver; accessed only during initialization or user programming mode. Use Value: Enables OEM-specific personalization without firmware reflash - automotive temp rating ensures reliability in door cavities exposed to thermal cycling. |
| Body Control Module (BCM) Fault Log | Advanced Driver Assistance System (ADAS) Sensor Calibration |
Use Scenario: Recording intermittent fault codes (e.g., lamp open/short, CAN timeout) with timestamp and counter for diagnostic retrieval. IC Role / Device Role / Timing Role: High-reliability event logger using WRAL for full-array overwrite during service reset; accessed via SPI-to-Microwire bridge IC. Use Value: Survives 10+ years of vehicle service life - >200-year data retention prevents log corruption even after extended storage. | Use Scenario: Storing factory-calibrated lens distortion coefficients and pixel gain maps for camera-based ADAS sensors. IC Role / Device Role / Timing Role: Secure boot-time configuration store; verified before image processing pipeline activation; isolated from main SoC power domain. Use Value: Automotive temperature rating ensures calibration integrity during engine heat soak - no recalibration drift observed over −40°C to +125°C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC76BT-E/OT | 16-bit organization (512 × 16), same voltage/temp range and package - no ORG/PE pins | Requires host software adaptation for 16-bit addressing and data packing; incompatible with x8-only drivers | Select only if system architecture mandates 16-bit word alignment and firmware supports dual-word access patterns |
| AT25DF041A-SH-T | SPI interface (4-wire), 4 Mbit density, 2.7–3.6 V operation, SOIC-8 package - no automotive qualification | Higher bandwidth (50 MHz SPI), but lacks AEC-Q100 validation and requires PCB layout change | Consider for non-automotive industrial designs needing higher density and faster throughput; not suitable for automotive EOL production |
Compared with 93LC76BT-E/OT, the 93LC76AT-E/OT provides native 8-bit compatibility without address translation, while AT25DF041A-SH-T offers greater capacity and speed at the cost of interface incompatibility and missing automotive qualification - making 93LC76AT-E/OT the sole drop-in solution for legacy Microwire-based automotive platforms.
Availability
93LC76AT-E/OT is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and ADAS sensor calibration requiring stable component supply across extended product lifecycles and rigorous environmental compliance.
Supply support for 93LC76AT-E/OT 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC76A/B/C series was designed specifically for cost-sensitive, low-power automotive and industrial applications requiring robust nonvolatile storage in space-constrained packages - emphasizing reliability, wide voltage operation, and Microwire interoperability.
FAQ
What is the memory organization of the 93LC76AT-E/OT?
The 93LC76AT-E/OT has a fixed 1024 × 8-bit (8 Kbit) organization. Unlike the 'C' variants, it does not feature an ORG pin and cannot be configured for 16-bit operation. This simplifies hardware design by eliminating external logic for word-size selection and ensures deterministic addressing in 8-bit systems.
Does the 93LC76AT-E/OT support the Program Enable (PE) pin function?
No, the 93LC76AT-E/OT does not include a PE pin. As an 'A' variant, it lacks both ORG and PE pins - write protection is managed exclusively through the EWEN/EWDS instruction sequence. Programming is always enabled upon power-up until EWDS is issued, requiring careful firmware sequencing to prevent accidental writes.
What is the maximum clock frequency supported by the 93LC76AT-E/OT at 3.3 V operation?
At VCC = 3.3 V (within 2.5–4.5 V range), the 93LC76AT-E/OT supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) of the datasheet. Exceeding this limit may cause command misinterpretation or failed write cycles due to violated TCKH/TCKL timing margins.
Can the 93LC76AT-E/OT be used in place of the 93LC76CT-E/OT without hardware changes?
No, the 93LC76AT-E/OT cannot replace the 93LC76CT-E/OT without hardware changes. The 'C' version includes ORG and PE pins (requiring two additional PCB traces), whereas the 'A' version uses only six pins in SOT-23. Attempting substitution would leave ORG/PE unconnected or floating, violating datasheet requirements and disabling write functionality.
Is the 93LC76AT-E/OT qualified to AEC-Q100 standards?
Yes, the 93LC76AT-E/OT carries the 'E' temperature grade (−40°C to +125°C) and is manufactured and tested per AEC-Q100 stress test requirements for automotive applications. Its qualification is documented in Microchip's automotive product release notices and supported by lot-level PPAP documentation available upon request.
93LC76AT-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
93LC76AT-E/OT FAQ
1.How can I place an order for 93LC76AT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC76AT-E/OT 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-E/OT reliable?
The price and inventory of 93LC76AT-E/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC76AT-E/OT is usually 5 days.
3.What payment methods are accepted for 93LC76AT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC76AT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC76AT-E/OT?
93LC76AT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC76AT-E/OT 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-E/OT?
For technical support, including 93LC76AT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC76AT-E/OT requirements.
6.How does Aetrix verify that 93LC76AT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93LC76AT-E/OT 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-E/OT meets industry standards.
7.What is the process for return or replacement of 93LC76AT-E/OT?
All 93LC76AT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93LC76AT-E/OT, 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-E/OT part is unused and in its original packaging.
Return procedure for 93LC76AT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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