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Microchip Technology 93AA46A-I/ST
- Part No.:
- 93AA46A-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA46A-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,243
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Product details
Overview
93AA46A-I/ST from Microchip Technology Inc. is a 1Kbit (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 ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded microcontroller systems for parameter storage and calibration data retention.
For engineers reviewing the 93AA46A-I/ST datasheet, 93AA46A-I/ST pinout, 93AA46A-I/ST application, or 93AA46A-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 WRAL/ERAL commands in resource-constrained designs.
Technical Context
The 93AA46A-I/ST implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO signals. It operates without an ORG pin, fixing memory organization to 128 words × 8 bits. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit followed by opcode, address, and optional data on the rising edge of CLK.
Internal logic includes auto-erase-before-write, hardware-based power-on reset detection (VPOR = 1.5 V), and status reporting via DO pin during programming. The device enters Standby mode when CS is low, drawing only 1 µA typical ICCS, and supports clock frequencies up to 3 MHz at VCC ≥ 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin required |
| Supply voltage | 1.8–5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers |
| Endurance | 1,000,000 erase/write cycles - supports long-term field calibration updates |
| Data retention | >200 years at +25°C - ensures firmware parameter integrity over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no additional level shifters needed |
| Access time | TPD ≤ 400 ns (VCC = 1.8 V, CL = 100 pF) - meets timing budgets in fast-read applications like boot configuration |
| Operating temp | –40°C to +85°C (Industrial grade) - qualified for industrial control and automotive cabin modules |
Pinout & Package
93AA46A-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant matte tin finish, and pin 1 marked by laser indentation. Package dimensions: 3.0 mm × 4.4 mm × 1.2 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| DI | Data Input | Receives Start bit, opcodes, addresses, and write data; shares net with DO in single-line configurations (with series resistor) |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| NC | No Connect | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice |
| VCC | Power Supply | 1.8–5.5 V input; internal POR triggers below 1.5 V to inhibit writes during brownout |
| ORG | Organization | Not present on 'A' devices - permanently configured for 8-bit operation; pin 6 is NC |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - TWC = 6 ms max for AA/LC versions reduces firmware overhead |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial-write corruption in firmware update routines |
| Power-on/off data protection | Hardware VPOR circuit blocks writes below 1.5 V - prevents inadvertent corruption during power ramp-up/down |
| Ready/Busy status on DO | Enables polling-based write completion detection - avoids fixed delays and improves system responsiveness |
| Sequential read mode | Continuous data stream across addresses with CS held high - accelerates bulk parameter reads in boot loaders |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients and tariff tables that require field updates over 15+ year service life. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year data retention and 1M endurance for periodic recalibration events. Use Value: Eliminates need for battery-backed SRAM; withstands repeated firmware upgrades and power cycling in utility infrastructure. | Use Scenario: Holding I/O mapping, PID tuning parameters, and safety thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Serial configuration EEPROM interfaced directly to ARM Cortex-M MCU GPIOs using Microwire protocol. Use Value: Enables zero-footprint, low-pin-count configuration storage - critical for space-constrained DIN-rail mounted controllers. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Settings |
Use Scenario: Retaining user preferences (window position, mirror angle) and fault logs in automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade serial EEPROM with 1.8–5.5 V operation, supporting CAN/LIN subsystems powered from 3.3 V rails. Use Value: Qualified for extended temperature range without derating; immune to brownout-induced corruption during ignition transients. | Use Scenario: Storing drug library profiles, dosage limits, and operator audit trails in Class II medical infusion pumps requiring regulatory traceability. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory with documented 1M cycle endurance and >200-year retention for FDA 21 CFR Part 11 compliance. Use Value: Meets IEC 62304 software lifecycle requirements for permanent data storage without external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46A-I/ST | Same 128×8 architecture but 2.5–5.5 V VCC range; lacks 1.8 V support | Not suitable for 1.8 V systems; otherwise pin- and functionally identical | Select only if system VCC never drops below 2.5 V - avoids under-voltage write risk |
| AT25010B-SSHL-T | 1 Kbit SPI EEPROM (not Microwire); 1.8–5.5 V; 20 MHz max clock; no ERAL/WRAL | Requires SPI driver stack instead of Microwire; no bulk-erase or bulk-write commands | Choose when migrating to SPI ecosystem or needing faster clock rates; rework firmware for instruction set differences |
Compared with 93LC46A-I/ST, the 93AA46A-I/ST supports lower-voltage operation down to 1.8 V, enabling direct use in ultra-low-power sensor nodes. Versus AT25010B-SSHL-T, it retains Microwire compatibility and built-in ERAL/WRAL - reducing MCU code size and improving reliability in legacy designs.
Availability
93AA46A-I/ST is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, smart metering platforms, and medical device configuration storage requiring stable component supply across multi-year production cycles.
Supply support for 93AA46A-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, FPGA, and memory solutions, headquartered in Chandler, Arizona.
The 93XX46 family was designed specifically for cost-sensitive, low-power embedded systems requiring reliable, pin-efficient nonvolatile storage - emphasizing simplicity, wide VCC range, and robust data integrity under voltage stress.
FAQ
What is the memory organization of the 93AA46A-I/ST?
The 93AA46A-I/ST has a fixed 128 × 8-bit (1 Kbit) organization with no ORG pin - unlike 'C' variants, it does not support x16 mode. This simplifies PCB layout and firmware design by eliminating external configuration logic. Its dedicated x8 structure ensures consistent 8-bit data framing across all READ, WRITE, and ERASE operations, making it ideal for 8-bit microcontroller interfaces.
Does the 93AA46A-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA46A-I/ST does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy polling, and enters High-Z when CS is low or during non-read states. However, if DI and DO are shorted (single-wire mode), a 10 kΩ series resistor is recommended to prevent bus conflict during the dummy zero phase of READ - per Microchip's AN1179 guidance.
What is the minimum VCC required for write operations on the 93AA46A-I/ST?
The 93AA46A-I/ST requires VCC ≥ 1.8 V for all operations, but write functionality is inhibited below VPOR ≈ 1.5 V - a built-in voltage detect circuit holds the device in write-inhibit state during power-up or brownout. Valid write operations occur only within the specified 1.8–5.5 V range, with TWC = 6 ms typical at 1.8 V and 3 ms at 5.5 V. Always verify VCC stability before issuing EWEN.
Can the 93AA46A-I/ST be used in place of the 93AA46C-I/ST?
No - the 93AA46A-I/ST and 93AA46C-I/ST are not interchangeable. The 'A' version has no ORG pin and is fixed at 8-bit mode; the 'C' version includes an ORG pin to select between 8-bit and 16-bit organization. Pin 6 on the 93AA46A-I/ST is NC, while on the 'C' variant it is functional. Substituting them requires PCB redesign and firmware changes to handle differing instruction sets and address widths.
How is the Ready/Busy status monitored on the 93AA46A-I/ST?
The Ready/Busy status is monitored by polling the DO pin: after initiating ERASE, WRITE, ERAL, or WRAL, bring CS high for ≥250 ns (TCSL), then sample DO - low indicates ongoing operation, high confirms completion. The status remains valid until the next Start bit. No external interrupt is needed, and the feature eliminates reliance on fixed timeout delays, improving real-time determinism in time-critical applications using the 93AA46A-I/ST.
93AA46A-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
93AA46A-I/ST FAQ
1.How can I place an order for 93AA46A-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46A-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 93AA46A-I/ST reliable?
The price and inventory of 93AA46A-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 93AA46A-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA46A-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46A-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46A-I/ST?
93AA46A-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46A-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 93AA46A-I/ST?
For technical support, including 93AA46A-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46A-I/ST requirements.
6.How does Aetrix verify that 93AA46A-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA46A-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 93AA46A-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA46A-I/ST?
All 93AA46A-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46A-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 93AA46A-I/ST part is unused and in its original packaging.
Return procedure for 93AA46A-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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