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Microchip Technology 93AA66B-I/SN
- Part No.:
- 93AA66B-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66B-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
93AA66B-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with dedicated 16-bit organization, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It uses Microwire-compatible 3-wire serial interface (CS, CLK, DI, DO), supports self-timed erase/write cycles, and delivers 1,000,000 endurance cycles with >200 years data retention. It is used in embedded system configuration storage where compact nonvolatile memory with deterministic timing is required.
For engineers reviewing the 93AA66B-I/SN datasheet, 93AA66B-I/SN pinout, 93AA66B-I/SN application, or 93AA66B-I/SN equivalent, key selection criteria include guaranteed 16-bit word access without ORG pin dependency, industrial-grade reliability under low-voltage operation, microwire timing compliance at 1.8 V, and compatibility with legacy 3-wire controllers requiring no protocol translation.
Technical Context
The 93AA66B-I/SN implements a fixed 256 × 16-bit memory array accessed via synchronous serial interface. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit (CS high + DI high on CLK rising edge), followed by opcode, address, and optional data bits clocked on CLK rising edges. The device enters Standby mode when CS is low, and power-on reset ensures automatic EWDS state entry.
Ready/Busy status is reported on the DO pin during erase/write operations: DO = low indicates active programming; DO = high signals completion. No external timing components are required - all erase/write cycles are fully self-timed (TWC = 6 ms for 93AA versions), and sequential read is supported while CS remains high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit organization) |
| VCC range | 1.8 V to 5.5 V - enables direct interface with 1.8 V, 2.5 V, 3.3 V, and 5 V logic systems |
| Endurance | 1,000,000 erase/write cycles - supports frequent firmware parameter updates in field-deployed devices |
| Data retention | >200 years at 25°C - ensures long-term configuration integrity without refresh |
| Write cycle time | 6 ms max - deterministic programming latency for real-time system response planning |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI, DO) - interoperable with legacy microcontrollers lacking SPI hardware |
| Temperature grade | Industrial (–40°C to +85°C) - qualified for use in industrial control, metering, and automotive body electronics |
Pinout & Package
93AA66B-I/SN is supplied in 8-lead SOIC (SN) package with standard pinout and no ORG pin (fixed 16-bit mode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry/exit |
| 2 CLK | Serial Clock | Input synchronizing all data transfers; rising edge clocks opcode/address/data; stoppable mid-sequence |
| 3 DI | Data Input | Serial input for Start bit, opcodes, addresses, and write data; requires pull-down if unused |
| 4 DO | Data Output / Status | Tri-state output delivering read data or Ready/Busy status (low = busy); high-Z when CS low or idle |
| 5 VSS | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance |
| 6 NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 8 VCC | Power Supply | 1.8–5.5 V supply with built-in POR detection at ~1.5 V; powers all internal logic and memory array |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delay loops - reduces firmware complexity and improves reliability |
| Automatic ERAL before WRAL | Ensures full-array write success without separate erase command - simplifies host driver implementation |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC - prevents corruption during brown-out or power ramp |
| Ready/Busy status on DO | Enables polling-based synchronization without interrupt lines or fixed delays - optimizes CPU utilization |
| Sequential read mode | Allows continuous address increment while CS stays high - accelerates bulk configuration reads |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing deterministic 16-bit word access during boot and runtime recalibration. Use Value: Eliminates factory-trimmed resistors and enables field-updatable calibration - reducing BOM cost and supporting adaptive maintenance. | Use Scenario: Holding board-specific settings (baud rate, I/O mapping, network ID) in modular industrial gateways. IC Role / Device Role / Timing Role: Microwire-configurable memory interfaced directly to MCU GPIOs without SPI peripheral overhead. Use Value: Enables zero-footprint configuration storage with guaranteed 6 ms write latency - critical for deterministic boot sequences. |
| Automotive Body Control Module | Medical Device Parameter Storage |
Use Scenario: Retaining user preferences (mirror position, seat memory) in 12 V automotive systems with wide input voltage transients. IC Role / Device Role / Timing Role: Low-voltage EEPROM operating down to 1.8 V during cold-crank conditions, with robust ESD immunity (≥4 kV). Use Value: Maintains parameter integrity across battery voltage dips - avoiding reconfiguration after engine restart. | Use Scenario: Storing FDA-mandated usage logs and calibration history in portable diagnostic equipment. IC Role / Device Role / Timing Role: High-reliability nonvolatile memory with >200-year data retention and 1M-cycle endurance for audit trail recording. Use Value: Meets regulatory requirements for permanent, tamper-resistant event logging without battery backup. |
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 | Same 256 × 16-bit organization but wider VCC range (2.5–5.5 V); no 1.8 V support | Not suitable for 1.8 V or mixed-voltage systems; better noise margin at 3.3/5 V | Select when operating exclusively above 2.5 V and higher immunity to supply ripple is needed |
| 93AA66A-I/SN | Same 4 Kbit capacity and 1.8–5.5 V range but fixed 512 × 8-bit organization | Requires byte-aligned addressing; incompatible with 16-bit word access protocols | Select only when host controller expects 8-bit data framing and no word-size flexibility is required |
Compared with 93LC66B-I/SN, the 93AA66B-I/SN enables lower-voltage operation critical for energy-harvesting and battery-powered designs; compared with 93AA66A-I/SN, it provides native 16-bit word access that eliminates software bit-packing and reduces firmware overhead in word-oriented systems.
Availability
93AA66B-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 93AA66B-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, manufacturing, and sales operations.
The 93XX series EEPROMs were designed specifically for space-constrained, low-power embedded systems needing reliable, protocol-simple nonvolatile storage - emphasizing microwire compatibility, wide VCC tolerance, and industrial temperature qualification.
FAQ
What is the memory organization of the 93AA66B-I/SN?
The 93AA66B-I/SN has a fixed 256 × 16-bit organization - meaning it stores 256 words of 16 bits each, totaling 4,096 bits. Unlike 'C' variants, it does not have an ORG pin; its 16-bit word size is hardwired, eliminating configuration dependency and simplifying host interface logic. This differs from the 93AA66A-I/SN (512 × 8-bit) and 93AA66C-I/SN (selectable via ORG pin).
Does the 93AA66B-I/SN require an external ORG pin connection?
No, the 93AA66B-I/SN does not require or support an ORG pin. Pins 6 and 7 are marked NC (No Connect) in the SOIC package, confirming the device is permanently configured for 16-bit operation. This eliminates routing complexity and potential misconfiguration risks present in ORG-enabled variants like the 93AA66C-I/SN.
What is the minimum VCC required for reliable operation of the 93AA66B-I/SN?
The 93AA66B-I/SN operates reliably from 1.8 V to 5.5 V. Its internal power-on reset circuit detects VCC ≥1.5 V, but functional operation - including valid read/write timing and data integrity - is guaranteed only within the 1.8–5.5 V range specified in the datasheet. Below 1.8 V, parameters such as clock frequency and output drive are not characterized.
How does the 93AA66B-I/SN indicate readiness after a write operation?
The 93AA66B-I/SN signals readiness via the DO pin: during an erase or write cycle, DO outputs low (busy) while programming is active, then transitions high (ready) upon completion. To poll this status, CS must be brought high for ≥250 ns after the initial instruction, and DO must be sampled on the rising edge of CLK. Issuing a new Start bit clears the status flag.
Is the 93AA66B-I/SN RoHS compliant and Pb-free?
Yes, the 93AA66B-I/SN is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on all leads. This is confirmed in the device features list and packaging documentation, and applies to the SN (SOIC) package variant. Compliance is verified per JEDEC J-STD-609A standards, and marking includes the "3e" Pb-free designation on the package body.
93AA66B-I/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:
- 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93AA66B-I/SN FAQ
1.How can I place an order for 93AA66B-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66B-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 93AA66B-I/SN reliable?
The price and inventory of 93AA66B-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 93AA66B-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66B-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66B-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66B-I/SN?
93AA66B-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66B-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 93AA66B-I/SN?
For technical support, including 93AA66B-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66B-I/SN requirements.
6.How does Aetrix verify that 93AA66B-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66B-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 93AA66B-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66B-I/SN?
All 93AA66B-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66B-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 93AA66B-I/SN part is unused and in its original packaging.
Return procedure for 93AA66B-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA66B-I/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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