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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 93AA46X-I/SN

Name: 93AA46X-I/SN
Brand: Microchip Technology
SKU: 93AA46X-I/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 93AA46X-I/SN

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: 93AA46X-I/SN.pdf

Description:: IC EEPROM 1KBIT MICROWIRE 8SOIC

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Product details

Overview

93AA46X-I/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8 or 64 × 16) low-voltage serial EEPROM with Microwire interface, ORG-pin-selectable memory organization, and 1.8 V to 5.5 V single-supply operation. It delivers 70 µA typical active read current at 1.8 V, 2 µA standby current, and supports industrial temperature range (–40°C to +85°C) in an 8-lead SOIC (SN) package. It is used for nonvolatile parameter storage in embedded sensor nodes and power-constrained industrial controllers.

For engineers reviewing the 93AA46X-I/SN datasheet, 93AA46X-I/SN pinout, 93AA46X-I/SN application, or 93AA46X-I/SN equivalent, key selection criteria include its 1.8 V minimum operating voltage, self-timed erase/write cycles, 1 million endurance cycles, 200+ year data retention, and compatibility with legacy Microwire-based microcontroller peripherals.

Technical Context

The 93AA46X-I/SN implements a synchronous 3-wire Microwire serial interface with CS, CLK, and bidirectional DI/DO lines. Its internal architecture includes an address counter, output buffer, data register, and mode decode logic enabling sequential read, ERAL (Erase All), and WRAL (Write All) operations without external timing control.

Memory configuration is determined by the ORG pin: tied to V_CC selects 64 × 16-bit organization (128 words), tied to V_SS selects 128 × 8-bit organization (128 bytes). The device enters Erase/Write Disable (EWDS) state on power-up and requires explicit EWEN instruction before any programming operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	1 Kbit (128 × 8 or 64 × 16), enabling compact firmware parameter or calibration storage
Supply voltage	1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters
Read current	70 µA typical at 1.8 V - minimizes system power budget in battery-operated devices
Endurance	1,000,000 erase/write cycles - suitable for applications requiring frequent field updates (e.g., metering logs)
Data retention	>200 years at 25°C - ensures long-term reliability in unattended infrastructure equipment
Operating temperature	–40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor sensing
Interface protocol	Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® and 8051 MCUs with native Microwire support

Pinout & Package

8-lead SOIC (SN) package per JEDEC MS-012 standard, 150 mil body width, surface-mount compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 CS	Chip Select	Active-high enable; must be held low ≥250 ns between instructions to reset internal logic
2 CLK	Serial Clock	Synchronizes all data transfers; rising edge clocks opcode/address/data; stops freely during transmission
3 DI	Data Input	Receives Start bit, opcodes, addresses, and write data; shares net with DO in shared-bus configurations
4 DO	Data Output / Status	Outputs read data or Ready/Busy status (low = busy); high-Z when inactive; requires pull-up for status polling
5 V_SS	Ground	Reference return path for all digital and analog circuitry; must be low-impedance
6 ORG	Memory Organization	Selects x8 (V_SS) or x16 (V_CC) mode; floating allowed only ≤1 MHz in x16 mode
7 NU	No Connect	Internally unused; must be left unconnected or tied to V_SS/V_CC per layout best practice
8 V_CC	Power Supply	Single supply input; internal power-on/off protection activates below 1.4 V to prevent corruption

Key Features

Feature	Design Value
Self-timed erase/write	Eliminates need for external timing control - WRAL completes in 16 ms typical, ERAL in 8 ms typical
Auto-ERAL before WRAL	Ensures full array erase prior to bulk write, preventing partial-data corruption without host software intervention
Power-on/off data protection	Hardware lockout below 1.4 V prevents inadvertent writes during brown-out or startup transients
Sequential read mode	Enables continuous byte/word streaming while CS remains high - reduces command overhead in configuration loading
RDY/BSY status via DO	Allows polling-based programming flow without fixed delays - improves system responsiveness and timing predictability

Applications

Industrial Sensor Calibration	Legacy MCU Firmware Storage
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in smart pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter memory accessed during power-up initialization and runtime correction routines. Use Value: Enables field-replaceable sensor modules with calibrated performance across –40°C to +85°C without recalibration tools.	Use Scenario: Holding bootloader configuration flags and application update metadata in PIC16F-based HVAC controllers. IC Role / Device Role / Timing Role: Microwire-compatible serial EEPROM interfaced directly to PIC's MSSP module in legacy designs. Use Value: Maintains backward compatibility with existing PCB layouts and firmware drivers while supporting 1.8 V operation.
Energy Meter Tamper Logs	Medical Device Usage Counters
Use Scenario: Recording timestamped tamper events (cover removal, magnetic interference) in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: High-endurance data logger with guaranteed 1M cycles - critical for infrequent but mission-critical writes. Use Value: Meets utility-grade audit requirements with >200-year data retention, eliminating periodic flash refresh maintenance.	Use Scenario: Tracking cumulative usage hours and sterilization cycles in portable infusion pumps. IC Role / Device Role / Timing Role: Low-power nonvolatile counter updated on each power cycle or procedure completion. Use Value: Supports regulatory traceability (IEC 62304) with 2 µA standby current extending battery life between service intervals.

Industrial Sensor Calibration

Legacy MCU Firmware Storage

Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in smart pressure transmitters.

IC Role / Device Role / Timing Role: Nonvolatile parameter memory accessed during power-up initialization and runtime correction routines.

Use Value: Enables field-replaceable sensor modules with calibrated performance across –40°C to +85°C without recalibration tools.

Use Scenario: Holding bootloader configuration flags and application update metadata in PIC16F-based HVAC controllers.

IC Role / Device Role / Timing Role: Microwire-compatible serial EEPROM interfaced directly to PIC's MSSP module in legacy designs.

Use Value: Maintains backward compatibility with existing PCB layouts and firmware drivers while supporting 1.8 V operation.

Energy Meter Tamper Logs

Medical Device Usage Counters

Use Scenario: Recording timestamped tamper events (cover removal, magnetic interference) in ANSI C12.20-compliant electricity meters.

IC Role / Device Role / Timing Role: High-endurance data logger with guaranteed 1M cycles - critical for infrequent but mission-critical writes.

Use Value: Meets utility-grade audit requirements with >200-year data retention, eliminating periodic flash refresh maintenance.

Use Scenario: Tracking cumulative usage hours and sterilization cycles in portable infusion pumps.

IC Role / Device Role / Timing Role: Low-power nonvolatile counter updated on each power cycle or procedure completion.

Use Value: Supports regulatory traceability (IEC 62304) with 2 µA standby current extending battery life between service intervals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
93AA46C-I/SN	Pin-compatible successor with enhanced ESD rating (6 kV HBM vs. 4 kV) and updated qualification per AEC-Q200 Grade 2	Required for new automotive or high-reliability industrial designs where extended stress testing is mandated	Select 93AA46C-I/SN for new designs; 93AA46X-I/SN remains valid for legacy repair and continuity programs
AT25010B-MAHL-T	SPI interface (not Microwire), 1 MHz max clock vs. 2 MHz (V_CC ≥4.5 V), no ORG pin - fixed 128 × 8 organization	Suitable where SPI-native MCUs are used and memory organization flexibility is not required	Choose AT25010B-MAHL-T only if migrating from Microwire to SPI and accepting loss of x16 mode and lower max clock at 1.8 V

Compared with 93AA46X-I/SN, the 93AA46C-I/SN offers improved robustness for harsh environments without layout changes, while the AT25010B-MAHL-T trades Microwire compatibility for broader SPI ecosystem support and slightly higher speed at 3.3 V - neither is a drop-in replacement without firmware or schematic review.

Availability

93AA46X-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, legacy MCU firmware storage, and energy meter tamper logging requiring stable component supply across extended product lifecycles.

Supply support for 93AA46X-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, and Flash-IP solutions, serving industrial, automotive, and consumer markets with vertically integrated silicon and development tools.

The 93AA46X-I/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring simple 3-wire nonvolatile storage with minimal MCU resource usage.

FAQ

What is the memory organization flexibility of the 93AA46X-I/SN?

The 93AA46X-I/SN supports dual memory configurations via the ORG pin: connecting ORG to V_SS configures it as 128 × 8-bit (128 bytes), while connecting ORG to V_CC configures it as 64 × 16-bit (128 words). This allows optimization for byte-addressed or word-addressed MCU architectures without changing the 93AA46X-I/SN hardware.

Does the 93AA46X-I/SN require external timing components for erase or write operations?

No - the 93AA46X-I/SN features fully self-timed erase and write cycles, including auto-erase before WRAL. Once the falling edge of CS initiates a programming command, the device internally manages timing; no external capacitors, clocks, or wait states are needed. The 93AA46X-I/SN completes WRAL in 16 ms typical and ERAL in 8 ms typical at 5 V.

How does the 93AA46X-I/SN protect against data corruption during power transitions?

The 93AA46X-I/SN incorporates hardware power-on/power-off protection that inhibits all programming modes until V_CC exceeds 1.4 V and disables them when V_CC falls below 1.4 V. Combined with mandatory EWEN instruction before erase/write and automatic EWDS on power-up, this ensures the 93AA46X-I/SN cannot be inadvertently written during brown-out or startup.

Can the 93AA46X-I/SN be used with modern 3.3 V or 5 V microcontrollers?

Yes - the 93AA46X-I/SN operates across 1.8 V to 5.5 V and maintains full DC and AC specifications across this range. Its VIH/VIL thresholds scale with V_CC, and it delivers 70 µA read current at 1.8 V and 500 µA at 3.0 V. It interfaces natively with 3.3 V and 5 V MCUs using Microwire peripherals, such as legacy PIC16/18 devices.

Is the 93AA46X-I/SN pinout identical to standard 8-lead SOIC packages?

Yes - the 93AA46X-I/SN uses the standard 8-lead SOIC (SN) package per JEDEC MS-012, with 1.27 mm pitch and 3.91 mm body width. Its pinout matches industry-standard Microwire EEPROMs: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = V_SS, Pin 6 = ORG, Pin 7 = NU, Pin 8 = V_CC. This enables direct replacement in existing SOIC footprints.

93AA46X-I/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

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:: 2 MHz

Write Cycle Time - Word, Page:: 10ms

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

93AA46X-I/SN FAQ

1.How can I place an order for 93AA46X-I/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for 93AA46X-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 93AA46X-I/SN reliable?

The price and inventory of 93AA46X-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 93AA46X-I/SN is usually 5 days.

3.What payment methods are accepted for 93AA46X-I/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46X-I/SN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 93AA46X-I/SN?

93AA46X-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 93AA46X-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 93AA46X-I/SN?

For technical support, including 93AA46X-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46X-I/SN requirements.

6.How does Aetrix verify that 93AA46X-I/SN is sourced from the original manufacturer or authorized distributors?

All 93AA46X-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 93AA46X-I/SN meets industry standards.

7.What is the process for return or replacement of 93AA46X-I/SN?

All 93AA46X-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46X-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 93AA46X-I/SN part is unused and in its original packaging.

Return procedure for 93AA46X-I/SN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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