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Microchip Technology 93C66C-E/SN
- Part No.:
- 93C66C-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C66C-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
93C66C-E/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with configurable 8-/16-bit word organization via the ORG pin, 4.5–5.5 V supply range, industrial/automotive temperature support (−40°C to +125°C), and Microwire-compatible 3-wire serial interface. It delivers 1 million erase/write cycles and >200 years data retention for nonvolatile parameter storage in embedded control systems.
For engineers reviewing the 93C66C-E/SN datasheet, 93C66C-E/SN pinout, 93C66C-E/SN application, or 93C66C-E/SN equivalent, key selection criteria include ORG-pin-configurable word size, automotive-grade voltage and temperature compliance, self-timed erase/write timing (2 ms), Ready/Busy status signaling on DO, and Pb-free SOIC-8 packaging.
Technical Context
The 93C66C-E/SN implements a synchronous Microwire-compatible serial interface with CS, CLK, DI, and DO signals plus ORG for runtime memory width selection. Its internal architecture includes address decoder, mode decode logic, and output buffer, enabling sequential read, ERAL, WRAL, and instruction-based erase/write operations.
Operation requires an EWEN command before programming; power-on default is EWDS. VCC detection threshold is 3.8 V, and all erase/write cycles are self-timed - 2 ms for standard write (TWC), 6 ms for ERAL (TEC), and 15 ms for WRAL (TWL) at 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16, selected by ORG pin) |
| VCC range | 4.5 V to 5.5 V - ensures compatibility with 5 V logic systems and automotive supply rails |
| Endurance | 1,000,000 erase/write cycles - supports frequent field calibration or configuration updates |
| Data retention | >200 years at 25°C - guarantees long-term parameter integrity without refresh |
| Write cycle time | 2 ms (TWC) - enables fast firmware patching or runtime parameter save |
| Operating temp | −40°C to +125°C (Automotive E grade) - qualified for under-hood and powertrain applications |
| Interface | 3-wire Microwire-compatible serial (CS/CLK/DI/DO) - minimal GPIO usage, no SPI master required |
Pinout & Package
93C66C-E/SN is packaged in 8-lead SOIC (SN) with Pb-free Matte Tin finish. Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is ORG; pin 7 is NC; pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: must be held ≥250 ns low between instructions; initiates self-timed write on falling edge (93C series) |
| CLK | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stopped clock allowed during transmission |
| DI | Data Input | Receives Start bit, opcodes, addresses, and write data; high-Z when not selected |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| ORG | Organization Control | Logic high → 256 × 16-bit; logic low → 512 × 8-bit; must be externally biased |
| VSS | Ground | Reference for all I/O and internal circuitry; connects to system GND plane |
| NC | No Connection | Pin 7 has no internal bond; must be left unconnected or tied to GND per layout best practice |
| VCC | Power Supply | 4.5–5.5 V input; internal POR triggers at 3.8 V; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM part to serve both 8-bit microcontroller and 16-bit DSP host interfaces |
| Auto-erase before write | Eliminates need for separate erase command - simplifies firmware driver logic |
| ERAL and WRAL commands | Full-array erase (6 ms) and full-array write (15 ms) reduce boot-time initialization overhead |
| Ready/Busy polling on DO | Allows non-blocking operation: host continues other tasks while EEPROM programs |
| EWEN/EWDS security | Prevents accidental writes - device powers up in locked (EWDS) state requiring explicit enable |
Applications
| Motor Control Parameter Storage | Automotive Instrument Cluster Calibration |
|---|---|
Use Scenario: Storing motor phase advance tables, current limits, and thermal derating curves in BLDC inverters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during startup and runtime reconfiguration. Use Value: Enables field-upgradable motor profiles without firmware reflashing; survives 1M+ power cycles. | Use Scenario: Retaining odometer values, warning thresholds, and display brightness settings across ignition cycles. IC Role / Device Role / Timing Role: Automotive-grade persistent memory interfaced to 8-bit MCU over Microwire. Use Value: Meets AEC-Q100 stress requirements; 125°C operation prevents data loss in dashboard environments. |
| Industrial PLC Configuration Backup | Medical Device Safety Settings |
Use Scenario: Saving I/O mapping, scan rates, and alarm setpoints in programmable logic controllers. IC Role / Device Role / Timing Role: Serial EEPROM used during cold start to restore user-defined operational parameters. Use Value: 200-year data retention ensures integrity over equipment lifetime; SOIC-8 eases board-level replacement. | Use Scenario: Securing FDA-mandated calibration offsets, usage counters, and fault history in portable diagnostics. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory with write-protection (EWEN/EWDS) for regulatory audit trails. Use Value: Prevents unauthorized parameter modification; 1M endurance supports daily recalibration logs for 27 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66C-E/SN | Wider VCC range (2.5–5.5 V); same pinout, ORG function, and instruction set | Supports 3.3 V and 5 V systems; lacks 93C66C's 4.5–5.5 V optimized timing | Select for mixed-voltage designs where 3.3 V operation is required |
| AT25DF041A-SHN-T | Quad SPI interface; 4 Mbit density; different command set and timing; no ORG pin | Higher throughput but requires SPI-capable host; no word-size flexibility | Select only when higher bandwidth or larger capacity is needed and ORG configurability is unnecessary |
Compared with 93LC66C-E/SN, the 93C66C-E/SN offers tighter VCC tolerance and faster write timing (2 ms vs. 6 ms), making it preferable in stable 5 V automotive subsystems; versus AT25DF041A-SHN-T, it provides simpler interface logic and hardware-configurable word size at lower density and speed.
Availability
93C66C-E/SN is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial PLCs, and medical diagnostic devices requiring stable component supply, long-life data retention, and AEC-Q100-aligned reliability.
Supply support for 93C66C-E/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 93C66C-E/SN belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal external components and flexible word-width support.
FAQ
What is the function of the ORG pin on the 93C66C-E/SN?
The ORG pin on the 93C66C-E/SN selects memory organization: logic high configures 256 × 16-bit (x16), logic low configures 512 × 8-bit (x8). It must be externally biased to a valid logic level before operation; floating is not permitted. This allows one 93C66C-E/SN part to serve both 8-bit and 16-bit host systems without redesign.
Does the 93C66C-E/SN require an external pull-up resistor on the DO pin?
No, the 93C66C-E/SN does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when deselected or idle. A pull-up may cause bus contention if DI and DO are shorted; Microchip recommends a series resistor if shared-line topology is used.
What is the minimum VCC voltage required for reliable operation of the 93C66C-E/SN?
The 93C66C-E/SN requires VCC ≥ 4.5 V for all operations. Its internal power-on reset (POR) circuit activates at 3.8 V, but functional operation - including ERAL, WRAL, and write cycles - is only guaranteed within the 4.5–5.5 V range. Operating below 4.5 V risks incomplete writes or corrupted data.
How does the 93C66C-E/SN indicate readiness after a write operation?
The 93C66C-E/SN indicates readiness by driving DO high when CS is brought high after ≥250 ns low (TCSL). While programming, DO remains low; once complete, DO goes high. Issuing a Start bit followed by CS low clears this status. This Ready/Busy polling eliminates need for fixed delay timers in host firmware.
Is the 93C66C-E/SN pin-compatible with the 93AA66C-E/SN?
No, the 93C66C-E/SN is not pin-compatible with the 93AA66C-E/SN. Although both share the same SOIC-8 package and pin assignments, their VCC ranges differ (4.5–5.5 V vs. 1.8–5.5 V), and the 93AA66C-E/SN supports lower-voltage operation with different AC timing. Interchange requires validation of voltage margins, timing budgets, and POR behavior in the target system.
93C66C-E/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:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C66C-E/SN FAQ
1.How can I place an order for 93C66C-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66C-E/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 93C66C-E/SN reliable?
The price and inventory of 93C66C-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C66C-E/SN is usually 5 days.
3.What payment methods are accepted for 93C66C-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66C-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66C-E/SN?
93C66C-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66C-E/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 93C66C-E/SN?
For technical support, including 93C66C-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66C-E/SN requirements.
6.How does Aetrix verify that 93C66C-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C66C-E/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 93C66C-E/SN meets industry standards.
7.What is the process for return or replacement of 93C66C-E/SN?
All 93C66C-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C66C-E/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 93C66C-E/SN part is unused and in its original packaging.
Return procedure for 93C66C-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C66C-E/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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