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Microchip Technology 93C66CT-I/SN
- Part No.:
- 93C66CT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C66CT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
93C66CT-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and 8-bit organization (no ORG pin). It delivers 1 million erase/write cycles, >200-year data retention, and industrial temperature operation (–40°C to +85°C) in an 8-lead SOIC package. Used for configuration storage in embedded controllers and power management ICs.
For engineers reviewing the 93C66CT-I/SN datasheet, 93C66CT-I/SN pinout, 93C66CT-I/SN application, or 93C66CT-I/SN equivalent, key selection criteria include VCC operating range (4.5–5.5 V), absence of ORG pin (fixed x8 mode), self-timed write/erase timing (2 ms), Ready/Busy status via DO pin, and SOIC-8 packaging compatibility with legacy board layouts.
Technical Context
The 93C66CT-I/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed 512 × 8-bit memory organization. It uses CMOS technology with on-chip power-on/off protection and automatic ERAL/WRAL support requiring ≥4.5 V for full functionality.
Timing is governed by strict AC parameters: max clock frequency of 3 MHz at 4.5–5.5 V, TWC = 2 ms for erase/write, TEC = 6 ms for ERAL, and TPD ≤ 200 ns for data output delay. Ready/Busy status is polled via DO pin after CS high pulse ≥250 ns following TCSL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization, fixed x8 mode) |
| VCC range | 4.5 V to 5.5 V - requires minimum 3.8 V for POR; not functional below 3.8 V |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C protocol support |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V |
| Data retention | >200 years - specified under normal operating conditions |
| Write cycle time | 2 ms (TWC) - self-timed; no external wait states required |
| Temp range | Industrial: –40°C to +85°C - qualified per Microchip's I-temp specification |
| Package | 8-lead SOIC (SN) - standard footprint, Pb-free Matte Tin finish |
Pinout & Package
8-lead SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. No ORG pin - confirms fixed 8-bit organization per device family definition.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions (TCSL) |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data |
| DI | Data Input | Receives Start bit, opcodes, addresses, and write data; tied to DO only with series resistor |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all logic and analog functions; must be connected before VCC |
| NC (Pins 6 & 7) | No internal connection | Not bonded; must remain unconnected - no pull-up/down or routing required |
| VCC | Power Supply | 4.5–5.5 V only; POR threshold = 3.8 V; voltage detect disables all operations below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - 2 ms cycle completes autonomously after CS/CLK trigger |
| Ready/Busy polling | DO pin provides real-time status during programming - enables efficient host CPU resource management |
| Automatic ERAL before WRAL | WRAL instruction includes built-in Erase All - ensures clean array before bulk write without separate command |
| Power-on/off data protection | Hardware-level lockout below 3.8 V VCC - prevents corruption during brown-out or power ramp |
| Industry-standard 3-wire interface | Direct drop-in replacement for legacy Microwire EEPROMs - no protocol translation needed |
| Pb-free and RoHS compliant | Matte Tin (Sn) finish on SOIC leads - meets global environmental compliance requirements |
Applications
| Industrial Motor Control | Smart Energy Meters |
|---|---|
Use Scenario: Storing calibration coefficients and fault logs in motor drive inverters operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 1M endurance and >200-year retention under thermal cycling. Use Value: Eliminates battery-backed SRAM; supports field firmware updates without data loss during power interruption. | Use Scenario: Holding tariff tables, metering constants, and tamper-event timestamps in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, long-life parameter storage interfaced to MCU via Microwire - compatible with existing meter SoC peripherals. Use Value: Meets 20+ year field life requirement; 4.5–5.5 V range aligns with meter's regulated 5 V rail. |
| Automotive Body Control Modules | Medical Diagnostic Equipment |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in BCMs deployed in passenger vehicles. IC Role / Device Role / Timing Role: Industrial-temp EEPROM used in non-safety-critical subsystems - leverages proven reliability and SOIC-8 layout compatibility. Use Value: Avoids qualification overhead of AEC-Q100 components where full automotive grade is unnecessary. | Use Scenario: Retaining user preferences, calibration offsets, and diagnostic history in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during boot and maintenance modes - standby current ≤5 µA minimizes battery drain. Use Value: Enables compact, cost-optimized design using widely available SOIC-8 footprint and standard Microwire drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-I/SN | 2.5–5.5 V VCC range; 256 × 16-bit organization; same SOIC-8 package | Requires ORG pin tie-off for x16 mode; wider voltage range suits mixed-supply systems | Select if system operates below 4.5 V or requires 16-bit word access |
| AT25040B-MAU-5.0 | SPI interface (4-wire), 1.8–5.5 V, 512 × 8-bit, same capacity; SOIC-8 package | Uses SPI instead of Microwire; lacks ERAL/WRAL auto-erase; different instruction set | Select if host MCU has SPI peripheral but no Microwire controller; verify timing and command compatibility |
Compared with 93LC66B-I/SN, the 93C66CT-I/SN offers higher VCC noise immunity and simpler x8-only interface, while AT25040B-MAU-5.0 trades Microwire compatibility for broader voltage support and SPI ubiquity - choice depends on host interface availability and supply stability requirements.
Availability
93C66CT-I/SN is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, and medical diagnostic equipment requiring stable component supply, long-term data integrity, and SOIC-8 footprint compatibility.
Supply support for 93C66CT-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, and Flash-IP solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets globally.
The 93C66CT-I/SN belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count nonvolatile storage in resource-constrained embedded systems with Microwire-compatible controllers.
FAQ
What is the memory organization of the 93C66CT-I/SN?
The 93C66CT-I/SN has a fixed 512 × 8-bit (4 Kbit) organization with no ORG pin - confirming it is a 'C66A'-type variant per Microchip's device selection table. Unlike 'C66C' versions, it does not support dynamic x8/x16 switching and requires no external ORG pin biasing.
Does the 93C66CT-I/SN support the ERAL (Erase All) command?
Yes, the 93C66CT-I/SN supports ERAL with a 6 ms cycle time (TEC), but requires VCC ≥ 4.5 V for proper operation. The command uses opcode '100' and initiates automatically on CS falling edge - verified in DS21795E Figures 2-3 and 2-4.
What is the maximum clock frequency supported by the 93C66CT-I/SN?
The 93C66CT-I/SN supports up to 3 MHz clock frequency (FCLK) when VCC is between 4.5 V and 5.5 V, as specified in Table 1-2 (Param A1). At lower voltages, maximum frequency drops - e.g., 2 MHz at 2.5–4.5 V - but 93C66CT-I/SN operates exclusively in the 4.5–5.5 V range.
How is data protection implemented in the 93C66CT-I/SN?
Data protection in the 93C66CT-I/SN includes hardware-level VCC monitoring (POR at 3.8 V), EWEN/EWDS lockout commands, and automatic power-on disable. The device powers up in EWDS mode, requiring explicit EWEN before any erase/write - preventing accidental writes during power transients.
Is the 93C66CT-I/SN pin-compatible with other 93XX66 variants in SOIC-8 package?
Yes, the 93C66CT-I/SN shares identical SOIC-8 pinout (SN) with all 93XX66A/B/C variants: CS (1), CLK (2), DI (3), DO (4), VSS (5), NC (6), NC (7), VCC (8). However, functional compatibility requires matching VCC range and organization - e.g., 93C66A-I/SN is direct pin-and-function match; 93C66C-I/SN adds ORG pin (not present here).
93C66CT-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:
- Not 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C66CT-I/SN FAQ
1.How can I place an order for 93C66CT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66CT-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 93C66CT-I/SN reliable?
The price and inventory of 93C66CT-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 93C66CT-I/SN is usually 5 days.
3.What payment methods are accepted for 93C66CT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66CT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66CT-I/SN?
93C66CT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66CT-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 93C66CT-I/SN?
For technical support, including 93C66CT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66CT-I/SN requirements.
6.How does Aetrix verify that 93C66CT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93C66CT-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 93C66CT-I/SN meets industry standards.
7.What is the process for return or replacement of 93C66CT-I/SN?
All 93C66CT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C66CT-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 93C66CT-I/SN part is unused and in its original packaging.
Return procedure for 93C66CT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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