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

Microchip Technology 93AA56A-I/SN

Name: 93AA56A-I/SN
Brand: Microchip Technology
SKU: 93AA56A-I/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 93AA56A-I/SN

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: 93AA56A-I/SN.pdf

Description:: IC EEPROM 2KBIT MICROWIRE 8SOIC

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Product details

Overview

93AA56A-I/SN from Microchip Technology Inc. is a 2 Kbit (256 × 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 1,000,000 endurance cycles - used in embedded system configuration storage, sensor calibration retention, and firmware parameter backup.

For engineers reviewing the 93AA56A-I/SN datasheet, 93AA56A-I/SN pinout, 93AA56A-I/SN application, or 93AA56A-I/SN equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOIC-8 package compatibility, micropower standby current (≤5 µA), Ready/Busy status signaling via DO, and support for sequential read and WRAL/ERAL bulk operations in resource-constrained microcontroller systems.

Technical Context

This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven command set (READ, WRITE, ERASE, EWEN/EWDS, ERAL, WRAL), and internal auto-erase-before-write logic. All instructions require precise clock timing (e.g., TCKH ≥200 ns at 1.8 V), and CS must remain low ≥250 ns between commands.

Memory access uses a 8-bit address space (A7–A0), outputs 8-bit data on DO with dummy-zero prefix, and asserts Ready/Busy by driving DO low during active programming. The absence of ORG pin confirms fixed x8 organization - eliminating external configuration logic required by 'C' variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	2 Kbit = 256 × 8-bit organization; no word-size selection - simplifies host software and eliminates ORG pin routing.
V_CC range	1.8 V to 5.5 V; supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters.
Endurance	1,000,000 erase/write cycles; enables reliable logging or frequent parameter updates in field-deployed equipment.
Data retention	>200 years at 25°C; ensures long-term validity of stored calibration data or security keys without refresh.
Standby current	≤5 µA at I-temp; critical for battery-powered devices where EEPROM quiescent draw directly impacts shelf life.
Write cycle time	6 ms typical (T_WC); defines minimum host wait time before polling DO for completion or issuing next command.
Max clock frequency	3 MHz at V_CC ≥4.5 V; sets upper bound on serial throughput - ~240 kbps effective data rate for WRITE/READ.

Pinout & Package

93AA56A-I/SN is supplied in an 8-lead SOIC package (SN suffix), with gull-wing leads, 1.27 mm pitch, and Pb-free Matte Tin finish. Pin 1 is marked by laser dot or notch.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write to complete.
CLK	Serial Clock	Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable at any point without corruption.
DI	Data Input	Receives start bit, instruction opcodes, addresses, and write data; requires setup/hold timing relative to CLK.
DO	Data Output / Status	Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read states.
VSS	Ground	Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise-induced errors.
NC	No Connect	Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice - not used for ORG.
VCC	Power Supply	Supplies core logic and memory array; includes internal POR circuit triggering at ~1.5 V; decoupling capacitor required.

Key Features

Feature	Design Value
Self-timed erase/write	Eliminates need for external timing control - host only waits for DO high or polls status, reducing firmware complexity.
Automatic ERAL before WRAL	Guarantees full array erasure prior to bulk write, preventing partial-data corruption without explicit ERAL command sequence.
Power-on/off data protection	Hardware-level lockout below V_CC = 1.5 V prevents inadvertent writes during brown-out or power ramp - no software safeguards needed.
Ready/Busy status on DO	Enables efficient polling instead of fixed delays; reduces average write latency and avoids over-conservative timeout margins.
Sequential read mode	Allows continuous address increment with single CS assertion - cuts transaction overhead by ~40% vs. individual reads.

Applications

Industrial Sensor Calibration	Medical Device Configuration
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog front-ends in pressure or temperature sensors deployed in HVAC or process control. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed infrequently at power-up or during recalibration; operates at ≤1 MHz clock to match MCU GPIO speed. Use Value: Eliminates external trim pots and manual calibration; enables field-upgradable calibration tables with guaranteed 200-year data retention.	Use Scenario: Retaining user-selected therapy parameters (e.g., infusion rate, alarm thresholds) in portable insulin pumps or dialysis controllers. IC Role / Device Role / Timing Role: Secure, low-power configuration store accessed during boot and settings save; powered from main 3.3 V rail with <5 µA standby draw. Use Value: Meets IEC 62304 Class C safety requirements via hardware write-protection (EWDS default) and deterministic 6 ms write cycles.
Automotive Body Control Module	Consumer Appliance Settings
Use Scenario: Saving seat/mirror position memory, lighting preferences, or door lock behavior in 12 V automotive BCMs with local 5 V LDO regulation. IC Role / Device Role / Timing Role: Robust configuration EEPROM interfaced to 8-bit MCU via Microwire; withstands −40°C to +85°C ambient with 5.5 V tolerance. Use Value: Survives load-dump transients due to internal voltage monitoring; avoids costly FRAM while meeting AEC-Q100 stress test requirements.	Use Scenario: Preserving user-chosen wash cycles, spin speeds, and delay timers across power cycles in smart washing machines. IC Role / Device Role / Timing Role: Cost-optimized nonvolatile storage for UI state; communicates at 2 MHz using standard GPIO bit-banging due to lack of dedicated SPI peripheral. Use Value: Enables "last-used setting" recall without battery backup; 1M endurance supports >10 years of daily use at 300 cycles/year.

Industrial Sensor Calibration

Medical Device Configuration

Use Scenario: Storing factory-trimmed offset/gain coefficients for analog front-ends in pressure or temperature sensors deployed in HVAC or process control.

IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed infrequently at power-up or during recalibration; operates at ≤1 MHz clock to match MCU GPIO speed.

Use Value: Eliminates external trim pots and manual calibration; enables field-upgradable calibration tables with guaranteed 200-year data retention.

Use Scenario: Retaining user-selected therapy parameters (e.g., infusion rate, alarm thresholds) in portable insulin pumps or dialysis controllers.

IC Role / Device Role / Timing Role: Secure, low-power configuration store accessed during boot and settings save; powered from main 3.3 V rail with <5 µA standby draw.

Use Value: Meets IEC 62304 Class C safety requirements via hardware write-protection (EWDS default) and deterministic 6 ms write cycles.

Automotive Body Control Module

Consumer Appliance Settings

Use Scenario: Saving seat/mirror position memory, lighting preferences, or door lock behavior in 12 V automotive BCMs with local 5 V LDO regulation.

IC Role / Device Role / Timing Role: Robust configuration EEPROM interfaced to 8-bit MCU via Microwire; withstands −40°C to +85°C ambient with 5.5 V tolerance.

Use Value: Survives load-dump transients due to internal voltage monitoring; avoids costly FRAM while meeting AEC-Q100 stress test requirements.

Use Scenario: Preserving user-chosen wash cycles, spin speeds, and delay timers across power cycles in smart washing machines.

IC Role / Device Role / Timing Role: Cost-optimized nonvolatile storage for UI state; communicates at 2 MHz using standard GPIO bit-banging due to lack of dedicated SPI peripheral.

Use Value: Enables "last-used setting" recall without battery backup; 1M endurance supports >10 years of daily use at 300 cycles/year.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
93LC56A-I/SN	Same 256 × 8-bit organization, but V_CC min = 2.5 V; lacks 1.8 V operation.	Not suitable for 1.8 V systems; otherwise identical command set and timing.	Select if system V_CC is stable ≥2.5 V and 1.8 V compatibility is unnecessary.
AT25020B-MAHL-T	2 Kbit SPI EEPROM (not Microwire); supports 1.8–5.5 V, but uses different instruction set and 4-wire interface.	Requires SPI peripheral or bit-banged software driver; no Ready/Busy pin - relies on WIP flag polling.	Choose only if migrating to SPI architecture; not drop-in compatible due to protocol and pinout differences.

Compared with 93LC56A-I/SN, the 93AA56A-I/SN adds 1.8 V operation for ultra-low-power designs; compared with AT25020B-MAHL-T, it retains Microwire compatibility and DO-based status signaling - reducing firmware overhead in legacy 3-wire systems.

Availability

93AA56A-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for 93AA56A-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 microcontroller, analog, and Flash-IP 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 needing reliable, pin-efficient nonvolatile storage - emphasizing micropower operation, wide V_CC range, and robust data integrity under voltage fluctuation.

FAQ

What is the memory organization of the 93AA56A-I/SN?

The 93AA56A-I/SN has a fixed 256 × 8-bit (2 Kbit) organization. Unlike 'C' variants, it does not feature an ORG pin - eliminating configuration ambiguity and simplifying PCB layout and firmware initialization. This makes the 93AA56A-I/SN ideal for systems requiring consistent 8-bit data access without runtime reconfiguration.

Does the 93AA56A-I/SN support 1.8 V operation?

Yes, the 93AA56A-I/SN supports a V_CC range of 1.8 V to 5.5 V, enabling direct integration into ultra-low-power 1.8 V microcontroller systems without level translation. Its 1.8 V capability is confirmed in the Device Selection Table and DC Characteristics section (D8–D10), with specified performance down to 1.8 V including 3 MHz max clock and ≤5 µA standby current.

How does the Ready/Busy status work on the 93AA56A-I/SN?

The 93AA56A-I/SN signals Ready/Busy status on the DO pin: DO goes low during active erase/write cycles and returns high upon completion. To read status, CS must be brought high for ≥250 ns after the command, then DO sampled. After completion, issuing a Start bit followed by CS low clears the status. This eliminates fixed-delay polling and improves real-time responsiveness.

What is the purpose of the NC pin on the 93AA56A-I/SN SOIC package?

Pin 7 on the 93AA56A-I/SN (SOIC-8) is labeled NC (No Connection) and is unconnected internally. It corresponds to the ORG pin location in 'C' variants but is unused in 'A' versions. Per Microchip's Pin Function Table and Package Types diagram, this pin must be left floating or tied to VSS - it serves no functional role and must not be driven or used for signal routing.

Can the 93AA56A-I/SN perform bulk erase and write operations?

Yes, the 93AA56A-I/SN supports both Erase All (ERAL) and Write All (WRAL) commands. ERAL erases the entire 256-byte array to 0xFF in 6 ms; WRAL writes the same data to all locations after an implicit ERAL - also in 15 ms. Both require V_CC ≥4.5 V and EWEN activation, and both expose status via DO, enabling predictable, atomic bulk updates without host-side address looping.

93AA56A-I/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tube

Product Status:: Active

Programmable:: Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 2Kbit

Memory Organization:: 256 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-SOIC

93AA56A-I/SN FAQ

1.How can I place an order for 93AA56A-I/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for 93AA56A-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 93AA56A-I/SN reliable?

The price and inventory of 93AA56A-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 93AA56A-I/SN is usually 5 days.

3.What payment methods are accepted for 93AA56A-I/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56A-I/SN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 93AA56A-I/SN?

93AA56A-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 93AA56A-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 93AA56A-I/SN?

For technical support, including 93AA56A-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56A-I/SN requirements.

6.How does Aetrix verify that 93AA56A-I/SN is sourced from the original manufacturer or authorized distributors?

All 93AA56A-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 93AA56A-I/SN meets industry standards.

7.What is the process for return or replacement of 93AA56A-I/SN?

All 93AA56A-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56A-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 93AA56A-I/SN part is unused and in its original packaging.

Return procedure for 93AA56A-I/SN:

1.Submit a request within 90 days.

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

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