My Inquiry
My Account
Microchip Technology 93AA66AXT-I/SN
- Part No.:
- 93AA66AXT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66AXT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,407
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93AA66AXT-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with fixed 8-bit organization, 512 × 8-bit memory array, 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 is commonly used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93AA66AXT-I/SN datasheet, 93AA66AXT-I/SN pinout, 93AA66AXT-I/SN application, or 93AA66AXT-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), guaranteed 1 million erase/write cycles, >200-year data retention, ready/busy status signaling via DO, and SOIC-8 (SN) package suitability for space-constrained PCB layouts.
Technical Context
The 93AA66AXT-I/SN implements a synchronous Microwire-compatible serial interface with dedicated CS, CLK, DI, and DO pins - no ORG pin (as confirmed for 'A' variants). Communication requires a start condition (CS high + DI high on first CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges.
It features hardware-based power-on/off data protection, automatic ERAL before WRAL, and EWEN/EWDS command-driven write enable/disable logic. Ready/Busy status is actively signaled on DO during erase/write operations when CS is reasserted after ≥250 ns low time (TCSL), enabling non-blocking polling in host firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization; fixed x8, no ORG pin) |
| VCC range | 1.8 V to 5.5 V - supports single-supply operation across low-power and legacy 5 V systems |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or logging updates in field-deployed devices |
| Data retention | >200 years at 25°C - ensures long-term reliability without refresh in battery-backed or maintenance-free applications |
| Write cycle time | 6 ms typical (TWC) - defines minimum interval between successive write commands; impacts firmware timing design |
| Interface protocol | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires minimal GPIO resources and avoids SPI mode ambiguity |
| Temperature grade | Industrial (−40°C to +85°C) - qualified for use in industrial control, metering, and automotive cabin electronics |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, body size 3.9 mm × 4.9 mm, standard JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns (TCSL) between instructions; deselects device into standby mode |
| 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, opcode, address, and write data; must meet VIH/VIL thresholds per VCC |
| 4 (DO) | Data Output / Status | Tri-state output for read data or ready/busy status (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference return path for all I/O and internal circuitry; requires low-impedance connection |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice (no functional role) |
| 7 (NC) | No Connect | Internally unconnected; identical handling as Pin 6 - no routing or termination required |
| 8 (VCC) | Power Supply | Primary supply input; includes internal POR detection at ~1.5 V; decoupling capacitor mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or firmware delays - host only polls DO for completion |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing partial-data corruption during WRAL execution |
| Power-on/off data protection | Hardware lockout below ~1.5 V VCC prevents inadvertent writes during brown-out or power ramp-up |
| Ready/Busy status on DO | Enables efficient polling-based write management without dedicated interrupt lines or timeout loops |
| Sequential read function | Allows continuous address increment and data streaming with single CS assertion - reduces transaction overhead |
Applications
| Industrial Sensor Calibration | Consumer Remote Control Memory |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted calibration values in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime via MCU's GPIO bit-banged Microwire interface. Use Value: Enables field recalibration without firmware update; 1M endurance supports >100 recalibrations/year over 10+ year product life. | Use Scenario: Retaining user-programmed channel presets, volume levels, and IR code learning history in universal remote controls. IC Role / Device Role / Timing Role: Low-power serial NV memory interfaced to 8-bit MCU with limited SPI peripherals; accessed infrequently during setup. Use Value: 1.8 V operation extends battery life; >200-year retention ensures settings persist across device lifetime without backup capacitor. |
| Medical Diagnostic Device Settings | Automotive Body Control Module NVM |
Use Scenario: Saving diagnostic thresholds, alarm limits, and operator preferences in portable blood glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Secure configuration store isolated from main MCU flash; accessed only during setup or error recovery sequences. Use Value: Hardware write-protection (EWEN/EWDS) prevents accidental overwrite during firmware updates or ESD events. | Use Scenario: Storing seat position memory, mirror angle offsets, and lighting profiles in automotive BCMs operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade serial EEPROM directly soldered to BCM PCB; interfaced via dedicated Microwire peripheral or GPIO. Use Value: Qualified industrial temperature range and 5.5 V tolerance ensure robustness against load-dump transients and cold-cranking conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66A-I/SN | VCC range 2.5–5.5 V; same 512 × 8-bit organization, SOIC-8 package, and Microwire interface | Not suitable for 1.8 V systems; higher minimum VCC excludes ultra-low-power designs | Select if system operates ≥2.5 V and requires Microchip's enhanced ESD protection (4 kV HBM) and extended automotive qualification path |
| AT25040B-SSHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, SOIC-8; lacks ERAL/WRAL and ORG flexibility | Requires SPI-capable MCU; no auto-ERAL before WRAL; different instruction set and timing | Choose when migrating to SPI-standardized firmware stack; verify DO timing (TPD = 250 ns max) matches host timing margins |
Compared with 93LC66A-I/SN, the 93AA66AXT-I/SN supports lower voltage operation critical for energy-harvesting systems; versus AT25040B-SSHL-T, it retains Microwire compatibility and integrated ERAL/WRAL automation but requires custom driver logic instead of standard SPI peripherals.
Availability
93AA66AXT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration storage, and automotive body control module NVM requiring stable component supply across extended product lifecycles.
Supply support for 93AA66AXT-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX66 family was designed specifically for cost-sensitive, low-power serial NVM applications where Microwire compatibility, guaranteed endurance, and industrial temperature resilience are essential - targeting embedded control, instrumentation, and consumer electronics.
FAQ
What is the memory organization of the 93AA66AXT-I/SN?
The 93AA66AXT-I/SN has a fixed 512 × 8-bit (4 Kbit) organization with no ORG pin - unlike 'C' variants, it does not support x16 mode. This is confirmed in the Device Selection Table and Pin Function Table, where ORG is marked NC for 'A' devices. The memory is accessed as eight-bit words, simplifying firmware integration for 8-bit MCUs.
Does the 93AA66AXT-I/SN support write protection features?
Yes, the 93AA66AXT-I/SN implements hardware-assisted write protection via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. It powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. This prevents accidental overwrites during power transitions or noise events, and is mandatory before executing ERASE, WRITE, or WRAL commands.
What is the maximum clock frequency supported by the 93AA66AXT-I/SN?
The 93AA66AXT-I/SN supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V, 2 MHz at 2.5–4.5 V, and 1 MHz at 1.8–2.5 V, as specified in Table 1-2 (A1). These limits are voltage-dependent and apply across the full industrial temperature range; exceeding them risks communication failure or incomplete instruction execution.
How is Ready/Busy status signaled on the 93AA66AXT-I/SN?
Ready/Busy status is signaled on the DO pin: logical low indicates ongoing erase/write operation; logical high indicates completion. To read status, CS must be brought high for ≥250 ns after the initial low period (TCSL), then DO sampled. Issuing a Start bit followed by CS low clears the status flag. DO returns to High-Z on CS falling edge.
Is the 93AA66AXT-I/SN RoHS compliant and lead-free?
Yes, the 93AA66AXT-I/SN is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on its SOIC-8 (SN) package, as explicitly stated in the Features section and Packaging Information. The "T" in the part number denotes Pb-free packaging, and the marking "3A66AT" on the device body confirms this designation per Microchip's marking convention.
93AA66AXT-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
- 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
93AA66AXT-I/SN FAQ
1.How can I place an order for 93AA66AXT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66AXT-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 93AA66AXT-I/SN reliable?
The price and inventory of 93AA66AXT-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 93AA66AXT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66AXT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66AXT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66AXT-I/SN?
93AA66AXT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66AXT-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 93AA66AXT-I/SN?
For technical support, including 93AA66AXT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66AXT-I/SN requirements.
6.How does Aetrix verify that 93AA66AXT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66AXT-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 93AA66AXT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66AXT-I/SN?
All 93AA66AXT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66AXT-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 93AA66AXT-I/SN part is unused and in its original packaging.
Return procedure for 93AA66AXT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA66AXT-I/SN Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
