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Microchip Technology 93LC66A-E/P
- Part No.:
- 93LC66A-E/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
93LC66A-E/P.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
93LC66A-E/P from Microchip Technology Inc. is a 4 Kbit (512 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for automotive temperature range (−40°C to +125°C), and featuring self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling via DO pin - used in automotive body control modules for parameter storage.
For engineers reviewing the 93LC66A-E/P datasheet, 93LC66A-E/P pinout, 93LC66A-E/P application, or 93LC66A-E/P equivalent, key selection criteria include VCC range compatibility (2.5–5.5 V), automotive-grade temperature rating, 8-bit fixed word organization, 1M endurance cycles, and Pb-free PDIP packaging with NC on pin 7.
Technical Context
The 93LC66A-E/P implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO lines - no ORG pin (dedicated x8 mode). It uses internal auto-erase-before-write logic and supports ERAL (Erase All) and WRAL (Write All) commands requiring ≥4.5 V for execution.
Power-on data protection is enforced by a built-in voltage detector (VPOR = 1.5 V), and write operations require explicit EWEN enable followed by EWDS disable for robustness. The DO pin serves dual function: serial data output during READ and Ready/Busy status polling during programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed x8 organization, no ORG pin; fits compact configuration storage without word-size negotiation. |
| VCC range | 2.5 V to 5.5 V - supports wide automotive supply rails including 3.3 V and 5 V systems without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - ensures reliable reprogramming over full vehicle lifecycle in ECU calibration updates. |
| Data retention | Greater than 200 years at 25°C - guarantees nonvolatile storage integrity across product service life. |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO) - minimal GPIO usage; compatible with legacy microcontrollers lacking SPI hardware. |
| Temp range | −40°C to +125°C (Automotive E grade) - qualified for under-hood and transmission control unit environments. |
| Write time | 6 ms typical program cycle (TWC) - enables fast firmware parameter updates without blocking host MCU operation. |
Pinout & Package
Package: 8-lead PDIP (P), Pb-free Matte Tin finish, through-hole mounting. Pin 1 marked by laser dot; pin 7 is NC (no internal connection) - confirmed for all 'A' variants per Device Selection Table and Pin Function Table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge. |
| 2 (CLK) | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; clock may pause mid-sequence without error. |
| 3 (DI) | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; tied high with pull-up for Start detection. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status read. |
| 5 (VSS) | Ground | Reference return path; decoupling capacitor required within 10 mm of pin for noise immunity. |
| 6 (NC) | No Connection | Internally unconnected; must remain floating or grounded - no routing or loading permitted. |
| 7 (VCC) | Power Supply | 2.5–5.5 V input; internal POR circuit holds device reset until VCC ≥1.5 V; requires local 100 nF ceramic bypass. |
| 8 (NC) | No Connection | Not bonded; electrically isolated - PCB pad may be omitted or left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; internal state machine completes 6 ms TWC autonomously after CS fall. |
| Automatic ERAL before WRAL | WRAL command internally executes full array erase prior to write - prevents partial-data corruption on power loss. |
| Ready/Busy status on DO | Enables polling-based flow control without interrupt pins; avoids fixed delays and improves system responsiveness. |
| EWEN/EWDS security lock | Prevents accidental writes: device powers up in EWDS mode; explicit EWEN required before any erase/write. |
| Pb-free & RoHS compliant | Meets automotive ELV directive; Matte Tin (Sn) finish ensures solderability and long-term intermetallic stability. |
Applications
| Automotive Body Control Unit | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing door lock configuration, mirror position presets, and lighting profiles in BCM firmware. IC Role / Device Role / Timing Role: Nonvolatile parameter memory interfaced to 8-bit MCU via Microwire; accessed during startup and user adjustment. Use Value: 1M endurance supports >10,000 seat/mirror adjustment cycles over 15-year vehicle life; 125°C rating ensures reliability near HVAC ducts. | Use Scenario: Retaining sensor offset/gain coefficients after factory calibration in pressure transmitters. IC Role / Device Role / Timing Role: Configuration storage element with infrequent write access but critical read persistence across power cycles. Use Value: 200-year data retention eliminates field recalibration; 2.5 V min VCC allows direct interface to 3.3 V sensor signal chain. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Logging dose history, alarm thresholds, and user preferences in battery-powered portable pumps. IC Role / Device Role / Timing Role: Low-power EEPROM for audit trail and safety-critical settings; accessed only during setup or fault recovery. Use Value: 500 µA max ICC write current extends battery life; standby current <1 µA preserves charge during 30-day shelf life. | Use Scenario: Storing tariff schedules, metering constants, and tamper-event logs in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Secure configuration and event log storage; write-protected via EWDS after commissioning. Use Value: Automotive-grade temp range ensures operation inside outdoor meter enclosures; WRAL simplifies firmware update rollback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-E/P | 16-bit organization (256 × 16), same VCC/temp range, identical pinout except ORG pin repurposed as NC | Requires host software to handle 16-bit word addressing; incompatible with existing 8-bit firmware drivers | Select only if system architecture mandates 16-bit data alignment and MCU supports native 16-bit Microwire framing. |
| AT25040B-MAHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, industrial temp only (−40°C to +85°C), no ERAL/WRAL | Lacks automotive qualification and auto-erase-all functionality; requires separate erase commands | Use where SPI is already implemented and AEC-Q100 compliance is not required; avoid in under-hood applications. |
Compared with 93LC66B-E/P, the 93LC66A-E/P provides guaranteed 8-bit compatibility and simpler driver code; versus AT25040B-MAHL-T, it delivers automotive qualification, integrated ERAL/WRAL, and lower pin count - critical for space-constrained ECU designs.
Availability
93LC66A-E/P is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor calibration modules, and medical infusion pump designs requiring stable component supply with long-term lifecycle assurance.
Supply support for 93LC66A-E/P 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 93LC66A-E/P belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems requiring robust nonvolatile storage in harsh environments.
FAQ
What is the maximum clock frequency supported by the 93LC66A-E/P?
The 93LC66A-E/P supports up to 3 MHz clock frequency at VCC ≥4.5 V, 2 MHz at 2.5 V ≤ VCC < 4.5 V, and 1 MHz at 1.8 V ≤ VCC < 2.5 V. Since the 93LC66A-E/P operates from 2.5 V to 5.5 V, its practical maximum is 3 MHz. This timing is defined in Table 1-2 (A1) of the DS21795E datasheet and verified across automotive temperature range.
Does the 93LC66A-E/P have an ORG pin, and how does it affect memory organization?
No, the 93LC66A-E/P does not have an ORG pin - it is a fixed 8-bit (512 × 8) organization device. Per the Device Selection Table and Pin Function Table, ORG is NC on all 'A' versions including 93LC66A-E/P. This eliminates external configuration complexity and ensures deterministic x8 behavior without risk of misconfiguration.
How is data protection implemented in the 93LC66A-E/P during power transitions?
The 93LC66A-E/P incorporates power-on/off data protection via an internal voltage detector (VPOR = 1.5 V). When VCC drops below 1.5 V, all operations are inhibited to prevent partial writes. Additionally, the device powers up in EWDS (Erase/Write Disable) mode, requiring explicit EWEN before any programming - ensuring data integrity during brown-out or cold-start conditions.
Can the 93LC66A-E/P be used in place of the 93AA66A-E/P?
No - the 93LC66A-E/P and 93AA66A-E/P differ in VCC range (2.5–5.5 V vs. 1.8–5.5 V) and temperature qualification (automotive E grade vs. industrial I grade only). While both are 512 × 8 EEPROMs with identical pinout and instruction set, the 93LC66A-E/P is specifically validated for −40°C to +125°C operation and lacks 1.8 V support, making it unsuitable for ultra-low-voltage applications.
What package type does the suffix '-E/P' indicate for the 93LC66A-E/P?
The '-E/P' suffix denotes Automotive temperature grade (E = −40°C to +125°C) in 8-lead PDIP (P) package with Pb-free Matte Tin finish. Per Microchip's Package Marking Information table (DS21795E, page 14), 'P' explicitly maps to PDIP, and 'E' confirms automotive qualification - distinct from 'I' (industrial) or 'SN' (SOIC) variants.
93LC66A-E/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
93LC66A-E/P FAQ
1.How can I place an order for 93LC66A-E/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66A-E/P 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 93LC66A-E/P reliable?
The price and inventory of 93LC66A-E/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66A-E/P is usually 5 days.
3.What payment methods are accepted for 93LC66A-E/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66A-E/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66A-E/P?
93LC66A-E/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66A-E/P 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 93LC66A-E/P?
For technical support, including 93LC66A-E/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66A-E/P requirements.
6.How does Aetrix verify that 93LC66A-E/P is sourced from the original manufacturer or authorized distributors?
All 93LC66A-E/P 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 93LC66A-E/P meets industry standards.
7.What is the process for return or replacement of 93LC66A-E/P?
All 93LC66A-E/P units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66A-E/P, 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 93LC66A-E/P part is unused and in its original packaging.
Return procedure for 93LC66A-E/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66A-E/P Tags
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