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Microchip Technology 93AA66BT-I/ST
- Part No.:
- 93AA66BT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA66BT-I/ST.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,764
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Product details
Overview
93AA66BT-I/ST from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 256 × 16-bit organization, Microwire-compatible 3-wire interface, and industrial temperature range (−40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 erase/write endurance - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93AA66BT-I/ST datasheet, 93AA66BT-I/ST pinout, 93AA66BT-I/ST application, or 93AA66BT-I/ST equivalent, key selection criteria include VCC range (1.8–5.5 V), ORG pin dependency for x16 mode, TSSOP-8 package compatibility, and Ready/Busy status via DO pin during programming.
Technical Context
The 93AA66BT-I/ST implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, requiring a Start bit detection before instruction execution. Its memory array is organized as 256 words × 16 bits, fixed by absence of ORG pin functionality ('B' variant), eliminating external word-size configuration logic.
It supports full instruction set including READ, WRITE, ERASE, ERAL, EWEN/EWDS, and WRAL, with all erase/write operations self-timed (6 ms typical) and status reported via DO pin polling. Power-on reset circuitry ensures data protection below 1.5 V VCC, and standby current is ≤5 µA at 25°C.
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, 3.3 V, and 5 V microcontrollers without level shifters |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no I²C pull-ups required |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent field-updatable parameter storage |
| Data retention | >200 years at 25°C - guarantees long-term calibration or serial number persistence |
| Operating temp | −40°C to +85°C (Industrial grade) - validated for industrial control and automotive cabin modules |
| Write cycle time | 6 ms max (TWC) - deterministic timing for firmware-controlled write sequencing |
Pinout & Package
93AA66BT-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed write on falling edge |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Receives Start bit, opcodes, addresses, and write data; shares no internal path with DO |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; requires low-impedance connection to minimize noise coupling |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization Select | Not applicable - 'B' variant has fixed 16-bit organization; pin is NC and unused |
| 8 (VCC) | Power Supply | Supplies core and I/O; internal POR triggers below 1.5 V; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or firmware delay loops - reduces host MCU overhead |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to full-array write - prevents partial-write corruption |
| Ready/Busy status on DO | Enables non-blocking polling instead of fixed delays - improves system responsiveness |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC - prevents inadvertent writes during brown-out or power ramp |
| 1,000,000 endurance cycles | Supports daily reconfiguration over 27+ years - suitable for production test and calibration logging |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot and maintenance mode via SPI-like Microwire bus. Use Value: Enables field-replaceable sensor modules without firmware update; 256×16-bit space accommodates multi-channel calibration tables. | Use Scenario: Holding user-defined settings (network ID, display contrast, alarm thresholds) in medical infusion pumps. IC Role / Device Role / Timing Role: Serial configuration store interfaced to ARM Cortex-M0+ MCU using GPIO bit-banged Microwire. Use Value: Survives 10+ years of battery-backed operation; 1.8 V minimum VCC allows direct connection to low-power MCU I/O rails. |
| Automotive Body Control Module | Consumer Appliance Settings Retention |
Use Scenario: Saving seat/mirror position memory and lighting preferences in 12 V vehicle systems with local 3.3 V LDO. IC Role / Device Role / Timing Role: Dedicated EEPROM for user preference storage, isolated from main MCU flash wear cycling. Use Value: Industrial temp rating ensures reliability across under-hood thermal cycling; 5.5 V max VCC tolerates load-dump transients. | Use Scenario: Retaining cooking program history and child-lock state in smart ovens after AC power loss. IC Role / Device Role / Timing Role: Standalone serial memory accessed during power-up initialization sequence. Use Value: 200-year data retention eliminates need for supercapacitor backup; TSSOP-8 footprint fits compact PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-I/ST | VCC min = 2.5 V; same pinout, 256×16-bit, identical timing and instruction set | Requires ≥2.5 V supply - unsuitable for 1.8 V systems but offers tighter VCC noise margin | Select when system VCC is stable ≥2.5 V and higher immunity to supply ripple is needed |
| AT25040B-SSHL-T | SPI interface (4-wire), 512×8-bit, 2.5–5.5 V, 20 MHz max clock | Requires separate SO/SI lines and chip select; lacks WRAL/ERAL commands and ORG flexibility | Choose for high-speed SPI-based designs where 4-wire overhead is acceptable and full-array erase is managed in firmware |
Compared with 93LC66BT-I/ST, the 93AA66BT-I/ST supports lower-voltage operation (1.8 V vs. 2.5 V), enabling direct integration into ultra-low-power sensor nodes; versus AT25040B-SSHL-T, it uses simpler 3-wire signaling but trades off maximum clock speed for reduced pin count and deterministic WRAL behavior.
Availability
93AA66BT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control module applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA66BT-I/ST 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 93AA66BT-I/ST belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count nonvolatile memory applications in industrial, automotive, and consumer electronics where Microwire compatibility and robust data retention are critical.
FAQ
What is the memory organization of the 93AA66BT-I/ST?
The 93AA66BT-I/ST is a 'B' variant device with fixed 256 × 16-bit organization - no ORG pin configuration is required or functional. This provides dedicated 16-bit word access, simplifying firmware handling of multi-byte parameters without bit-packing logic.
Does the 93AA66BT-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA66BT-I/ST does not require an external pull-up on DO. The pin actively drives high/low during READ or Ready/Busy status reporting and enters High-Z when deselected (CS low) or idle. A pull-up may cause bus contention if DI and DO are shorted.
Can the 93AA66BT-I/ST be used with a 1.8 V microcontroller I/O port?
Yes, the 93AA66BT-I/ST supports VCC down to 1.8 V and specifies VIH1 = 2.0 V (min) for VCC ≥ 2.7 V and VIH2 = 0.7×VCC for VCC < 2.7 V - at 1.8 V, VIH2 = 1.26 V, which is compatible with standard 1.8 V CMOS logic high levels.
What happens if the ORG pin is left floating on the 93AA66BT-I/ST?
The ORG pin on the 93AA66BT-I/ST is No Connect (NC) and internally unconnected - leaving it floating has no effect on operation. The device operates exclusively in 256×16-bit mode regardless of ORG pin state, as confirmed in the Device Selection Table and Pin Function Table.
How is data protection implemented during power transitions in the 93AA66BT-I/ST?
The 93AA66BT-I/ST incorporates hardware power-on/off protection that inhibits all write operations when VCC falls below ~1.5 V. This prevents partial writes or corruption during brown-out or power-up sequences, ensuring data integrity without requiring external supervisor ICs or firmware intervention.
93AA66BT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 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-TSSOP
93AA66BT-I/ST FAQ
1.How can I place an order for 93AA66BT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66BT-I/ST 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 93AA66BT-I/ST reliable?
The price and inventory of 93AA66BT-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66BT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA66BT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66BT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66BT-I/ST?
93AA66BT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66BT-I/ST 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 93AA66BT-I/ST?
For technical support, including 93AA66BT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66BT-I/ST requirements.
6.How does Aetrix verify that 93AA66BT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA66BT-I/ST 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 93AA66BT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA66BT-I/ST?
All 93AA66BT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66BT-I/ST, 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 93AA66BT-I/ST part is unused and in its original packaging.
Return procedure for 93AA66BT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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