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Microchip Technology 93AA46AT-I/ST
- Part No.:
- 93AA46AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA46AT-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,539
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Product details
Overview
93AA46AT-I/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), power-on/off data protection, and Ready/Busy status signaling via DO pin - deployed in embedded microcontroller systems for calibration storage and configuration retention.
For engineers reviewing the 93AA46AT-I/ST datasheet, 93AA46AT-I/ST pinout, 93AA46AT-I/ST application, or 93AA46AT-I/ST equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), TSSOP-8 package compatibility, 1 million erase/write endurance, >200-year data retention, and support for sequential read and status polling in resource-constrained designs.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present (confirmed for 'A' variant), enforcing fixed 128 × 8-bit memory mapping. Communication requires strict timing compliance: min. 250 ns CS low time (TCSL), max. 3 MHz clock frequency at VCC ≥ 4.5 V, and status polling via DO high/low transitions during write/erase operations.
Internally, it integrates power-on reset detection (VPOR = 1.5 V), EWEN/EWDS command-based write protection, and auto-erase-before-write logic. All programming cycles are self-timed (TWC = 6 ms for 93AA versions), eliminating external delay requirements, and operate independently of CLK after initiation - critical for deterministic firmware timing in real-time control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 words × 8 bits) - fixed x8 organization; no ORG pin; supports single-byte or sequential read/write. |
| Supply voltage | 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 - ensures long-term reliability in field-updatable systems like smart meters and industrial sensors. |
| Data retention | Greater than 200 years at 25°C - guarantees nonvolatile storage integrity across product lifecycles without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no I²C or SPI protocol overhead. |
| Temperature range | Industrial: –40°C to +85°C - qualified for deployment in automotive ECUs, PLCs, and outdoor IoT gateways. |
| Package | TSSOP-8 (ST suffix) - 3 mm × 4.4 mm footprint; surface-mount compatible; RoHS-compliant matte tin finish. |
Pinout & Package
TSSOP-8 package (ST suffix), Pb-free matte tin finish, 3 mm × 4.4 mm body, 0.65 mm lead pitch. Pin 1 marked by laser dot; pin 1 ID corner located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICCS ≤ 1 µA). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; supports stop/start mid-sequence; "don't care" when CS = low. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS and CLK rising edge to initiate instruction. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS falls; requires CS high ≥250 ns to sample status. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice - no functional role. |
| 7 (ORG) | Organization | Not present on 93AA46A variants - pin is NC; confirmed by Device Selection Table and Pin Function Table. |
| 8 (VCC) | Power Supply | 1.8–5.5 V input; includes on-chip POR (1.5 V threshold); powers internal logic, memory array, and I/O buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | 6 ms typical cycle time (TWC) - eliminates need for external timing control or firmware delays during programming. |
| Automatic ERAL before WRAL | Hardware-enforced erase-all prior to write-all - prevents partial writes and ensures atomic full-memory updates. |
| Power-on/off data protection | Internal circuitry inhibits all operations below VPOR = 1.5 V - prevents corruption during brown-out or hot-plug events. |
| Ready/Busy status signaling | DO pin doubles as status indicator - enables non-blocking polling instead of fixed-delay waits in host firmware. |
| Sequential read mode | Continuous data output while CS remains high - reduces transaction overhead for multi-byte reads (e.g., config blocks). |
Applications
| Smart Sensor Calibration | Industrial PLC Configuration |
|---|---|
|
Use Scenario: Storing sensor offset/gain coefficients updated during factory calibration or field recalibration. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently via MCU's GPIO-driven Microwire interface. Use Value: Eliminates need for battery-backed RAM; retains values across power cycles and temperature extremes (–40°C to +85°C). |
Use Scenario: Holding user-defined I/O mapping, alarm thresholds, and communication parameters in modular PLC bases. IC Role / Device Role / Timing Role: Serial configuration store interfaced to PLC's main controller over minimal 3-wire bus. Use Value: Enables field reconfiguration without firmware update; 1M endurance supports decades of parameter edits. |
| Medical Device Settings | Automotive Body Control Module |
|
Use Scenario: Retaining user preferences (e.g., display brightness, alarm volume) and safety-critical defaults in portable diagnostics tools. IC Role / Device Role / Timing Role: Low-power EEPROM co-located with MCU; accessed only during boot or menu navigation. Use Value: 1.8 V operation allows direct connection to ultra-low-power MCUs; >200-year retention meets medical device lifecycle requirements. |
Use Scenario: Storing door lock logic states, mirror position memories, and lighting profiles in BCMs. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM interfaced to 8/16-bit automotive-grade MCU. Use Value: Industrial temp grade satisfies under-hood ambient requirements; RoHS compliance aligns with automotive material standards. |
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 | Same 128 × 8-bit organization and TSSOP-8 package, but 2.5–5.5 V VCC range - lacks 1.8 V operation. | Not suitable for 1.8 V systems; otherwise pin- and function-compatible for 3.3 V/5 V designs. | Select 93LC46AT-I/ST only if system VCC ≥ 2.5 V and 1.8 V operation is unnecessary. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, but requires separate SO/SI pins and different command set. | Requires SPI-capable MCU peripheral and firmware rewrite; no Ready/Busy pin - relies on fixed timing or WIP polling. | Choose only if migrating to SPI architecture; not drop-in - PCB and software changes required. |
Compared with 93LC46AT-I/ST, the 93AA46AT-I/ST enables true 1.8 V operation and shares identical pinout and timing, while AT25010B-SSHL-T introduces interface incompatibility and removes hardware status signaling - making 93AA46AT-I/ST optimal for legacy Microwire-based or ultra-low-voltage designs.
Availability
93AA46AT-I/ST is available at Aetrix Electronics and suitable for smart sensor calibration, industrial PLC configuration, and medical device settings requiring stable component supply across extended production lifecycles.
Supply support for 93AA46AT-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX46 series was designed specifically for cost-sensitive, low-power embedded systems needing reliable serial nonvolatile storage - emphasizing simplicity, wide voltage operation, and robust data integrity in harsh environments.
FAQ
What is the memory organization of the 93AA46AT-I/ST?
The 93AA46AT-I/ST is a fixed 128 × 8-bit (1 Kbit) EEPROM with no ORG pin - confirming dedicated x8 organization per the Device Selection Table and Pin Function Table. Unlike 'C' variants, it does not support word-size selection; all addresses access 8-bit data words sequentially.
Does the 93AA46AT-I/ST require an external pull-up resistor on the DO pin?
No - the 93AA46AT-I/ST drives DO actively during read and status polling; however, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict when A0 = high during dummy-zero phase, as specified in Section 2.2 of DS20001749K.
What is the minimum VCC required for reliable operation of the 93AA46AT-I/ST?
The 93AA46AT-I/ST incorporates a power-on reset circuit with VPOR = 1.5 V (typical), meaning all operations - including read, write, and erase - are inhibited until VCC rises above this threshold. Stable operation begins at 1.8 V, the lower limit of its rated supply range.
Can the 93AA46AT-I/ST be used in place of the 93LC46AT-I/ST?
Yes, for 3.3 V and 5 V systems - the 93AA46AT-I/ST and 93LC46AT-I/ST share identical pinout, timing, and x8 organization. However, the 93AA46AT-I/ST extends down to 1.8 V, while the 93LC46AT-I/ST starts at 2.5 V; verify VCC compatibility before substitution.
How is write protection implemented on the 93AA46AT-I/ST?
Write protection uses EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands. The device powers up in EWDS mode; an EWEN instruction must precede any ERASE or WRITE. After programming, issuing EWDS disables further writes - preventing accidental overwrites during normal operation.
93AA46AT-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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 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-TSSOP
93AA46AT-I/ST FAQ
1.How can I place an order for 93AA46AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46AT-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 93AA46AT-I/ST reliable?
The price and inventory of 93AA46AT-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 93AA46AT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA46AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46AT-I/ST?
93AA46AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46AT-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 93AA46AT-I/ST?
For technical support, including 93AA46AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46AT-I/ST requirements.
6.How does Aetrix verify that 93AA46AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA46AT-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 93AA46AT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA46AT-I/ST?
All 93AA46AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46AT-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 93AA46AT-I/ST part is unused and in its original packaging.
Return procedure for 93AA46AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA46AT-I/ST Tags
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