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

Microchip Technology AT93C46A-10SI-1.8

Name: AT93C46A-10SI-1.8
Brand: Microchip Technology
SKU: AT93C46A-10SI-1.8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT93C46A-10SI-1.8

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: AT93C46A-10SI-1.8.pdf

Description:: IC EEPROM 1KBIT 3-WIRE 8SOIC

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Product details

Overview

AT93C46A-10SI-1.8 from Microchip Technology (formerly Atmel) is a 1K-bit, 64 × 16 organization serial EEPROM with three-wire interface, optimized for low-voltage operation from 1.8V to 5.5V, supporting up to 2 MHz clock rate at 5V, 1 million write cycles endurance, and 100-year data retention. It serves as nonvolatile configuration storage in automotive body control modules, industrial sensor nodes, and portable medical devices requiring stable memory under extended temperature.

For engineers reviewing the AT93C46A-10SI-1.8 datasheet, AT93C46A-10SI-1.8 pinout, AT93C46A-10SI-1.8 application, or AT93C46A-10SI-1.8 equivalent, key selection considerations include its 1.8V–5.5V supply range, SOIC-8 package, self-timed 10 ms max write cycle, ready/busy status via DO pin, and compatibility with legacy 3-wire SPI-like host controllers without CS deassertion timing constraints.

Technical Context

The AT93C46A-10SI-1.8 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal architecture includes address decoder, mode decode logic, clock generator, and output buffer driving a single bidirectional data line.

It supports dual voltage operation modes: 1.8V–5.5V (enabled by -1.8 suffix), with VIL/VIH thresholds scaled per VCC range (e.g., VIH = VCC × 0.7 for 1.8V ≤ VCC ≤ 2.7V). Write enable state persists until explicit EWDS or power removal, and status polling is enabled via CS high after tCS ≥ 250 ns during self-timed tWP (0.1–10 ms).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1024 bits (64 words × 16 bits); enables compact storage of calibration coefficients or device IDs in space-constrained PCBs.
Supply Voltage Range	1.8V to 5.5V; allows direct interfacing with 1.8V logic families and backward compatibility with 3.3V/5V systems without level shifters.
Interface Type	Three-wire serial (CS/SK/DI-DO); reduces pin count vs. SPI, avoids MISO/MOSI duplication, simplifies routing on dense boards.
Max Clock Frequency	2 MHz at VCC = 5V; supports fast read/write bursts in real-time control loops where latency < 500 ns matters.
Write Endurance	1 million cycles; sufficient for firmware update counters or logging buffers updated daily over 27 years.
Data Retention	100 years at +25°C; ensures long-term reliability in unattended infrastructure equipment like smart meters.
Operating Temperature	−40°C to +85°C; qualified for industrial and automotive under-hood applications without derating.

Pinout & Package

AT93C46A-10SI-1.8 is supplied in an 8-lead JEDEC SOIC package (package code 8S1), 3.9 mm × 4.9 mm footprint, 1.27 mm lead pitch, gull-wing leads, RoHS-compliant and halogen-free.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable; must be held low for full instruction cycle; DO outputs ready/busy status when pulled high mid-cycle.
SK	Serial Clock	Input-only; rising edge clocks all data in/out; min/max timing defined per VCC (e.g., tSKH/tSKL = 250 ns @ 2.7–5.5V).
DI	Data Input	Serial instruction and address/data input; accepts start bit "1", op code, and 6-bit address or 16-bit data.
DO	Data Output	Bidirectional; outputs 16-bit data (with leading dummy "0") during READ; returns "0"=busy / "1"=ready during write status polling.
GND	Ground	Reference for all I/O and supply; requires low-impedance connection to minimize noise coupling into serial interface.
VCC	Power Supply	Single supply input; supports 1.8V–5.5V; internal regulation enables stable core operation across voltage range.
DC	Don't Connect	No internal connection; must be left floating or tied to GND per design; not usable as NC for routing relief.
NC	No Connect	Internally unconnected; no electrical function; avoid routing signals or placing vias on this pad.

Key Features

Feature	Design Value
Self-timed write cycle	Eliminates need for external write-complete interrupt or fixed delay; DO pin provides real-time busy/ready feedback without timer polling overhead.
Erase/write enable/disable protocol	EWEN/EWDS instructions prevent accidental writes; enables secure field updates only after explicit enable, critical for safety-critical firmware storage.
Voltage-flexible I/O thresholds	VIL/VIH scale with VCC (e.g., VIH = 0.7×VCC at 1.8V), ensuring reliable communication across mixed-voltage systems without external level translation.
Extended temperature qualification	Rated −40°C to +85°C; validated for automotive body electronics and industrial PLCs where ambient thermal cycling exceeds commercial grade limits.
Lead-free and halogen-free packaging	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020; supports green manufacturing and end-of-life recycling requirements.

Applications

Automotive Body Control Unit	Industrial Sensor Calibration
Use Scenario: Storing door lock actuator position offsets and mirror fold/unfold profiles in a vehicle BCM. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding factory-set parameters that persist across ignition cycles and battery disconnects. Use Value: Enables consistent mechanical behavior without recalibration; leverages 100-year retention and −40°C to +85°C operation for under-dash mounting.	Use Scenario: Holding temperature-compensation coefficients for a pressure transducer in a factory automation system. IC Role / Device Role / Timing Role: Serial configuration store accessed during sensor power-up to initialize ADC gain/offset correction tables. Use Value: Achieves ±0.1% measurement accuracy across operating temperature; uses 1.8V compatibility to interface directly with ultra-low-power sensor ASICs.
Portable Medical Infusion Pump	Smart Energy Meter Firmware Log
Use Scenario: Recording dose history and alarm event timestamps in a battery-powered infusion pump with USB reprogramming capability. IC Role / Device Role / Timing Role: Low-power EEPROM storing time-stamped operational logs; accessed only during USB session or error recovery. Use Value: Delivers 14 µA standby current at 1.8V, extending battery life; 1M endurance supports >10 years of daily log entries.	Use Scenario: Archiving firmware update success/failure flags and cryptographic signature verification results in a Class 0.5S electricity meter. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile flag register used during secure boot and OTA update validation sequences. Use Value: Supports EWEN/EWDS protocol to prevent runtime corruption; 2 MHz interface speed enables fast signature verification handoff to host MCU.

Automotive Body Control Unit

Industrial Sensor Calibration

Use Scenario: Storing door lock actuator position offsets and mirror fold/unfold profiles in a vehicle BCM.

IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding factory-set parameters that persist across ignition cycles and battery disconnects.

Use Value: Enables consistent mechanical behavior without recalibration; leverages 100-year retention and −40°C to +85°C operation for under-dash mounting.

Use Scenario: Holding temperature-compensation coefficients for a pressure transducer in a factory automation system.

IC Role / Device Role / Timing Role: Serial configuration store accessed during sensor power-up to initialize ADC gain/offset correction tables.

Use Value: Achieves ±0.1% measurement accuracy across operating temperature; uses 1.8V compatibility to interface directly with ultra-low-power sensor ASICs.

Portable Medical Infusion Pump

Smart Energy Meter Firmware Log

Use Scenario: Recording dose history and alarm event timestamps in a battery-powered infusion pump with USB reprogramming capability.

IC Role / Device Role / Timing Role: Low-power EEPROM storing time-stamped operational logs; accessed only during USB session or error recovery.

Use Value: Delivers 14 µA standby current at 1.8V, extending battery life; 1M endurance supports >10 years of daily log entries.

Use Scenario: Archiving firmware update success/failure flags and cryptographic signature verification results in a Class 0.5S electricity meter.

IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile flag register used during secure boot and OTA update validation sequences.

Use Value: Supports EWEN/EWDS protocol to prevent runtime corruption; 2 MHz interface speed enables fast signature verification handoff to host MCU.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
M95128-WMN6TP	4K-bit (128 × 8), SPI interface, 2.5–5.5V supply, 20 MHz clock, WLCSP package option	Higher density, faster interface, but requires 4-wire SPI and lacks 1.8V support	Select when migrating to higher-capacity storage with existing SPI infrastructure and ≥2.5V system rails.
BR24G02FJ-3GE2	2K-bit (256 × 8), I²C interface, 1.7–5.5V supply, 400 kHz standard mode, TSSOP8 package	I²C bus sharing capability, lower pin count than 3-wire, but slower write speed (5 ms typical vs. 10 ms max)	Select when integrating into I²C-based sensor hubs or multi-device buses where addressability and shared SDA/SCL reduce BOM count.

Compared with M95128-WMN6TP and BR24G02FJ-3GE2, the AT93C46A-10SI-1.8 offers unique 1.8V–5.5V operation with three-wire simplicity and guaranteed 10 ms worst-case write time-making it optimal for legacy-compatible, ultra-low-voltage, and pin-constrained designs where SPI/I²C overhead is unacceptable.

Availability

AT93C46A-10SI-1.8 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor calibration, and portable medical devices requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AT93C46A-10SI-1.8 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 is a global provider of microcontrollers, analog components, and memory solutions, delivering scalable, secure, and energy-efficient semiconductor products for embedded control applications.

The AT93C46A-10SI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count, and wide-voltage-range nonvolatile storage in automotive, industrial, and consumer systems where reliability and longevity are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the AT93C46A-10SI-1.8?

The AT93C46A-10SI-1.8 is rated for operation from 1.8V to 5.5V, with guaranteed functionality down to 1.8V across the full industrial temperature range (−40°C to +85°C). Below 1.8V, timing margins degrade and write operations may fail; the device will not power up or respond to commands at voltages below 1.7V. This makes the AT93C46A-10SI-1.8 suitable for direct integration with 1.8V logic families without level-shifting circuitry.

Does the AT93C46A-10SI-1.8 support true SPI communication?

No, the AT93C46A-10SI-1.8 uses a proprietary three-wire serial interface (CS/SK/DI-DO), not standard SPI. It lacks separate MISO and MOSI lines-data is bidirectional on the DO pin-and does not support SPI mode settings (CPOL/CPHA). While host firmware can emulate the protocol using GPIOs, it cannot be connected directly to an SPI peripheral without bit-banging or custom driver logic. The AT93C46A-10SI-1.8 instruction set and timing (e.g., tCSS, tDIS) are distinct from SPI specifications.

How is write protection implemented on the AT93C46A-10SI-1.8?

Write protection on the AT93C46A-10SI-1.8 is enforced via the Erase/Write Enable (EWEN) and Erase/Write Disable (EWDS) instructions. Power-on default is EWDS state-no write/erase is possible until EWEN is issued. Once enabled, writes remain active until EWDS is sent or VCC is cycled. There is no hardware write-protect pin; protection is purely instruction-based and software-controlled. This prevents accidental overwrites while allowing field updates when explicitly authorized by firmware.

Can the AT93C46A-10SI-1.8 be used in automotive under-hood applications?

Yes-the AT93C46A-10SI-1.8 is qualified for automotive-grade extended temperature operation (−40°C to +85°C) and offered in lead-free/halogen-free packages. Its 100-year data retention, 1 million write cycles, and robust ESD tolerance (per AEC-Q100 stress testing methodology) make it suitable for under-hood body control modules, lighting controllers, and HVAC actuators. However, it is not AEC-Q100 Grade 0 (−40°C to +125°C); for engine bay locations exceeding +85°C, derating or alternative qualification is required.

What is the purpose of the DC and NC pins on the AT93C46A-10SI-1.8 SOIC package?

On the AT93C46A-10SI-1.8 in 8-lead SOIC (8S1), Pin 6 is labeled "DC" (Don't Connect) and Pin 7 is "NC" (No Connect). Neither pin has internal connectivity: DC is reserved for future use or test purposes and must remain unconnected or tied to GND per layout guidelines; NC is fully isolated and must be left floating. Routing traces or placing vias on these pads risks signal coupling or mechanical stress-both pins serve only as mechanical anchors and should be excluded from net assignments in PCB design.

AT93C46A-10SI-1.8 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:: 3-Wire Serial

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

AT93C46A-10SI-1.8 FAQ

1.How can I place an order for AT93C46A-10SI-1.8 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT93C46A-10SI-1.8 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 AT93C46A-10SI-1.8 reliable?

The price and inventory of AT93C46A-10SI-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C46A-10SI-1.8 is usually 5 days.

3.What payment methods are accepted for AT93C46A-10SI-1.8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C46A-10SI-1.8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT93C46A-10SI-1.8?

AT93C46A-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT93C46A-10SI-1.8 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 AT93C46A-10SI-1.8?

For technical support, including AT93C46A-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C46A-10SI-1.8 requirements.

6.How does Aetrix verify that AT93C46A-10SI-1.8 is sourced from the original manufacturer or authorized distributors?

All AT93C46A-10SI-1.8 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 AT93C46A-10SI-1.8 meets industry standards.

7.What is the process for return or replacement of AT93C46A-10SI-1.8?

All AT93C46A-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C46A-10SI-1.8, 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 AT93C46A-10SI-1.8 part is unused and in its original packaging.

Return procedure for AT93C46A-10SI-1.8:

1.Submit a request within 90 days.

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

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