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Microchip Technology 93AA46CT-I/ST
- Part No.:
- 93AA46CT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA46CT-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,037
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Product details
Overview
93AA46CT-I/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating across 1.8–5.5 V, supporting Industrial temperature range (−40°C to +85°C), and housed in an 8-lead TSSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection - used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93AA46CT-I/ST datasheet, 93AA46CT-I/ST pinout, 93AA46CT-I/ST application, or 93AA46CT-I/ST equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), 8-bit fixed organization (no ORG pin), TSSOP-8 footprint, 1M endurance cycles, and Ready/Busy status via DO pin during programming.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, requiring a start condition (CS high + DI high on first CLK rising edge) to initiate command execution. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are decoded from 9-bit opcodes clocked LSB-first on DI.
It uses internal auto-erase-before-write logic and supports sequential read mode when CS remains high. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator (low = busy, high = ready) after CS reassertion post-command initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit); fixed x8 organization - no ORG pin required, simplifying PCB layout vs. configurable variants. |
| VCC Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - supports frequent firmware or calibration updates in field-deployed devices. |
| Data Retention | Greater than 200 years at 25°C - ensures long-term reliability for unattended or maintenance-free applications. |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5 V - allows fast configuration loading; drops to 2 MHz at 2.5–4.5 V and 1 MHz below 2.5 V. |
| Write Cycle Time | 6 ms typical (TWC) - defines minimum time between successive WRITE commands; impacts boot-time parameter initialization latency. |
| Standby Current | 1 µA max (I-temp) - critical for battery-powered systems where EEPROM must remain powered but inactive for extended periods. |
Pinout & Package
8-lead TSSOP (ST) package, 3.0 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional (not electrically connected). Pin 1 marked by laser dot; pin 1 ID corner matches JEDEC MO-153 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby (1 µA ICCS). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks opcode/address/data; stoppable mid-sequence for master flexibility. |
| 3 (DI) | Data Input | Accepts start bit, 9-bit opcode, 7-bit address, and 8-bit data; LSB-first; requires setup/hold timing per AC specs. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read operations. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS - not used for ORG (unlike C-version parts). |
| 7 (ORG) | Organization Select | Not applicable - 93AA46CT-I/ST is A-version; ORG pin is NC and unused; memory is fixed 128×8-bit. |
| 8 (VCC) | Power Supply | Supplies core and I/O; includes internal POR detection (VPOR = 1.5 V typ); must be ≥4.5 V for ERAL/WRAL operation. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control - host MCU only monitors DO pin for completion, reducing firmware complexity. |
| Automatic ERAL before WRAL | Guarantees full array erase prior to bulk write, preventing partial writes and ensuring deterministic state after WRAL. |
| Power-On/Off Data Protection | Hardware-level lockout below VPOR (1.5 V) prevents corruption during brown-out or power ramp - no software intervention needed. |
| Ready/Busy Status via DO | Enables polling-based programming flow without dedicated interrupt line; avoids blocking delays in time-critical boot sequences. |
| Industry Standard 3-Wire Serial I/O | Reduces MCU GPIO count vs. SPI/I²C; compatible with legacy Microwire controllers and widely supported driver libraries. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and user-adjusted trim values in HVAC sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up and periodic recalibration routines. Use Value: 1.8–5.5 V operation allows direct integration with 3.3 V sensor signal chains; 200-year retention ensures calibration integrity over product lifetime. |
Use Scenario: Saving user preferences (temperature setpoints, cycle modes, display brightness) in smart washing machines. IC Role / Device Role / Timing Role: Persistent settings store updated on button press or UI interaction, with WRAL used for factory reset. Use Value: 1M endurance supports >100 daily setting changes for 27+ years; TSSOP-8 footprint fits compact control board layouts. |
| Medical Device Parameter Backup | Automotive Body Control Module |
|
Use Scenario: Retaining therapy parameters and usage logs in portable insulin pumps and nebulizers. IC Role / Device Role / Timing Role: Secure, low-power memory for regulatory-compliant audit trails and safety-critical configuration. Use Value: 1 µA standby current extends battery life; RoHS compliance meets medical device environmental requirements. |
Use Scenario: Storing door lock/unlock patterns, mirror position presets, and lighting profiles in BCMs. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to 5 V MCU via discrete level shifters or directly at 5 V VCC. Use Value: 5.5 V max VCC tolerance accommodates automotive 5 V rail variations; industrial temp grade covers under-hood ambient ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-I/ST | VCC range 2.5–5.5 V; identical 128×8-bit organization, TSSOP-8 package, and instruction set. | Not suitable for 1.8 V systems; requires minimum 2.5 V - excludes ultra-low-power or mixed-voltage designs. | Select if system operates strictly ≥2.5 V and cost optimization is prioritized (93LC46A typically lower unit price). |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling via STATUS register. | Requires SPI-capable MCU peripheral; lacks dedicated DO-status pin - increases firmware polling overhead vs. 93AA46CT-I/ST's direct DO monitoring. | Choose when existing design uses SPI peripherals exclusively and board space allows SOIC-8 instead of TSSOP-8. |
Compared with 93LC46AT-I/ST, the 93AA46CT-I/ST enables 1.8 V operation for battery-sensitive applications; compared with AT25010B-SSHL-T, it offers simpler 3-wire timing and hardware-ready signaling without STATUS register reads.
Availability
93AA46CT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device parameter backup requiring stable component supply across extended production lifecycles.
Supply support for 93AA46CT-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AAxx series targets cost-sensitive, low-power embedded systems needing reliable nonvolatile storage; designed specifically for Microwire-compatible interfaces in space-constrained applications where simplicity and voltage flexibility are critical.
FAQ
What is the memory organization of the 93AA46CT-I/ST?
The 93AA46CT-I/ST is an A-version device with fixed 128 × 8-bit (1 Kbit) organization. Unlike C-version parts, it has no functional ORG pin - pin 6 is NC. This eliminates external configuration logic and guarantees consistent 8-bit data width for all READ/WRITE operations.
Does the 93AA46CT-I/ST support 1.8 V operation?
Yes, the 93AA46CT-I/ST supports full functionality across 1.8 V to 5.5 V. At 1.8 V, maximum clock frequency is 1 MHz, and write cycle time extends to 6 ms. This makes it suitable for energy-harvesting and coin-cell-powered applications where low-voltage operation is mandatory.
How is Ready/Busy status monitored on the 93AA46CT-I/ST?
Ready/Busy status is monitored on the DO pin: after initiating ERASE, WRITE, ERAL, or WRAL, bring CS high for ≥250 ns, then sample DO - low indicates ongoing operation, high confirms completion. DO returns to High-Z when CS is low or during READ idle periods.
What is the purpose of the ORG pin on the 93AA46CT-I/ST?
The ORG pin on the 93AA46CT-I/ST is not functional - it is labeled "NC" (No Connection) in the pin function table and physically unconnected internally. This distinguishes it from C-version parts (e.g., 93AA46CT) where ORG selects x8/x16 mode. No external pull-up/down is required.
Can the 93AA46CT-I/ST be used in automotive applications?
The 93AA46CT-I/ST is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, consider the 93AA46CT-E/ST variant - same pinout and functionality but qualified to AEC-Q100 Grade 3 and specified across the extended temperature range.
93AA46CT-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:
- 1Kbit
- Memory Organization:
- 128 x 8, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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
93AA46CT-I/ST FAQ
1.How can I place an order for 93AA46CT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46CT-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 93AA46CT-I/ST reliable?
The price and inventory of 93AA46CT-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 93AA46CT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA46CT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46CT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46CT-I/ST?
93AA46CT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46CT-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 93AA46CT-I/ST?
For technical support, including 93AA46CT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46CT-I/ST requirements.
6.How does Aetrix verify that 93AA46CT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA46CT-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 93AA46CT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA46CT-I/ST?
All 93AA46CT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46CT-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 93AA46CT-I/ST part is unused and in its original packaging.
Return procedure for 93AA46CT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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