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Microchip Technology 93AA76A-I/ST
- Part No.:
- 93AA76A-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA76A-I/ST.pdf
- Description:
- IC EEPROM 8KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
93AA76A-I/ST from Microchip Technology is an 8K-bit (1024 × 8) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and Pb-free SOIC-8 package. It delivers 1 million erase/write cycles, >200-year data retention, and built-in power-on/off data protection for embedded system configuration storage.
For engineers reviewing the 93AA76A-I/ST datasheet, 93AA76A-I/ST pinout, 93AA76A-I/ST application, or 93AA76A-I/ST equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), absence of PE/ORG pins, self-timed erase/write, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers in space-constrained industrial designs.
Technical Context
The 93AA76A-I/ST implements a synchronous serial interface using CS, CLK, DI, and DO signals with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, EWEN, and EWDS instructions - all clocked on CLK rising edges - and uses internal auto-erase before write to ensure data integrity.
Its memory array operates in standalone mode without external address latches; sequential read is enabled by holding CS high, and Ready/Busy polling is performed by sampling DO after TCSL ≥250 ns. Power-supply voltage detect (VPOR = 1.5 V typical) prevents operation below safe VCC thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1024 × 8-bit organization - fixed, no ORG pin) |
| VCC range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V logic systems |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires no I²C pull-ups or SPI mode configuration |
| Write endurance | 1,000,000 erase/write cycles - supports frequent firmware parameter updates in field-deployed devices |
| Data retention | >200 years at 25°C - ensures long-term calibration or serial number storage without refresh |
| Operating temp | –40°C to +85°C (Industrial grade) - validated for use in factory automation and outdoor metering |
| Max clock frequency | 3 MHz at VCC ≥4.5 V - allows fast bulk reads in host-controlled boot sequences |
Pinout & Package
8-lead SOIC package (ST suffix), Pb-free Matte Tin finish, 150-mil body width, standard JEDEC MS-012AC footprint. Pin 1 marked by laser dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; device enters Standby when low, but completes ongoing write before sleeping |
| 2 CLK | Serial Clock | Positive-edge synchronous timing reference; clock can pause mid-transfer without corruption |
| 3 DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; must be stable before first CLK rising edge |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); tri-states on CS falling edge |
| 5 VSS | Ground | Reference return path for all digital and analog functions; decoupling capacitor required |
| 6 - | No connect | Unused pin - left floating or tied to VSS per layout best practice; not ORG or PE |
| 7 - | No connect | Unused pin - same as Pin 6; confirms A-version lacks ORG/PE functionality |
| 8 VCC | Power Supply | 1.8–5.5 V input; internal POR circuit holds device reset until VCC ≥1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host only polls DO for completion, reducing firmware overhead |
| Ready/Busy status on DO | Enables non-blocking operation: host continues other tasks while EEPROM programs, then checks DO |
| Power-on/off data protection | Hardware-level lockout prevents writes during brown-out or power ramp - no software initialization required |
| Sequential read mode | Reduces transaction count: holding CS high auto-increments address for continuous 1024-byte reads |
| Low standby current | 1 µA max at VCC = 2.5 V - extends battery life in always-on sensor nodes and portable instruments |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables and user-defined logic parameters in programmable logic controllers that undergo frequent reconfiguration. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime via Microwire bus; retains settings across AC power cycles. Use Value: Eliminates need for battery-backed SRAM; withstands 1M+ field updates without degradation over 10+ year product lifecycle. | Use Scenario: Holding factory-calibrated sensor offsets and gain coefficients in portable ECG monitors requiring FDA-compliant traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for critical analog front-end trim values; accessed only during device startup or service mode. Use Value: >200-year data retention meets medical device shelf-life requirements; 1.8 V operation enables direct connection to low-power ADC reference chains. |
| Smart Energy Meter Firmware Parameters | Automotive Body Control Module Settings |
Use Scenario: Saving tariff schedules, pulse constants, and communication protocol flags in ANSI C12.22-compliant electricity meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: Field-updatable parameter bank isolated from main MCU flash; accessed over dedicated Microwire bus during meter initialization. Use Value: Industrial temperature range (–40°C to +85°C) ensures reliability in unventilated meter enclosures; RoHS/Pb-free compliance meets global utility procurement mandates. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs where EEPROM must coexist with CAN/LIN buses. IC Role / Device Role / Timing Role: Dedicated configuration store for user preferences; immune to CAN transients due to separate 3-wire interface and internal noise filtering. Use Value: 1.8–5.5 V wide VCC range simplifies power domain design - shares 3.3 V rail with microcontroller without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC76A-I/ST | VCC range 2.5–5.5 V; identical 1024×8 organization, SOIC-8 package, and instruction set | Lacks 1.8 V support - unsuitable for ultra-low-power or mixed-voltage systems operating below 2.5 V | Select 93LC76A-I/ST only if system VCC is guaranteed ≥2.5 V and legacy qualification already covers this variant |
| AT25080B-SSHL-T | SPI interface (4-wire), 8 Kbit (1024×8), 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling | Requires SPI master instead of Microwire; no DO-based status signal increases host polling complexity | Choose AT25080B-SSHL-T only when migrating to SPI-based platforms or consolidating with existing Atmel SPI EEPROM inventory |
Compared with 93LC76A-I/ST, the 93AA76A-I/ST adds 1.8 V operation for battery-powered designs; compared with AT25080B-SSHL-T, it retains Microwire compatibility and hardware-ready signaling - critical for real-time deterministic response in industrial controllers.
Availability
93AA76A-I/ST is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data retention, and smart energy meter firmware parameter management requiring stable component supply across multi-year production cycles.
Supply support for 93AA76A-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 93XX series EEPROMs were designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage without battery backup - targeting industrial control, medical instrumentation, and consumer electronics.
FAQ
What is the memory organization of the 93AA76A-I/ST?
The 93AA76A-I/ST has a fixed 1024 × 8-bit (8 Kbit) organization. Unlike 'C' variants, it does not feature an ORG pin and cannot be configured for 16-bit operation. This simplifies PCB layout and firmware design by eliminating external configuration logic.
Does the 93AA76A-I/ST support 1.8 V operation?
Yes, the 93AA76A-I/ST supports a VCC range of 1.8 V to 5.5 V. Its minimum operating voltage of 1.8 V enables direct integration with modern ultra-low-power MCUs and sensors, unlike the 93LC76A-I/ST which requires ≥2.5 V.
How is Ready/Busy status indicated on the 93AA76A-I/ST?
The 93AA76A-I/ST indicates Ready/Busy status on the DO pin: DO = low during active erase/write cycles, and DO = high when complete. Status is valid only after CS is held low for ≥250 ns (TCSL) before going high.
Is the 93AA76A-I/ST pin-compatible with other 93XX76 variants in SOIC-8?
Yes - the 93AA76A-I/ST uses the same 8-pin SOIC (ST) footprint as 93LC76A-I/ST and 93C76A-I/ST. Pins 1–5 and 8 are functionally identical; Pins 6 and 7 are no-connect in all 'A' versions, ensuring drop-in replacement within the same voltage range.
What packaging and marking apply to the 93AA76A-I/ST?
The 93AA76A-I/ST is supplied in an 8-lead SOIC package (ST suffix), Pb-free Matte Tin finish, with top-side marking "A76A" followed by date code and traceability characters. The 'I' denotes Industrial temperature grade (–40°C to +85°C).
93AA76A-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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- 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
93AA76A-I/ST FAQ
1.How can I place an order for 93AA76A-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA76A-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 93AA76A-I/ST reliable?
The price and inventory of 93AA76A-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 93AA76A-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA76A-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA76A-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA76A-I/ST?
93AA76A-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA76A-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 93AA76A-I/ST?
For technical support, including 93AA76A-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA76A-I/ST requirements.
6.How does Aetrix verify that 93AA76A-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA76A-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 93AA76A-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA76A-I/ST?
All 93AA76A-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA76A-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 93AA76A-I/ST part is unused and in its original packaging.
Return procedure for 93AA76A-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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