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Microchip Technology AT93C46-10SI-1.8

Name: AT93C46-10SI-1.8
Brand: Microchip Technology
SKU: AT93C46-10SI-1.8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT93C46-10SI-1.8

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: AT93C46-10SI-1.8.pdf

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

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Product details

Overview

AT93C46-10SI-1.8 from Microchip Technology (formerly Atmel) is a 1K-bit three-wire serial EEPROM with user-selectable 128 × 8 or 64 × 16 organization, operating from 1.8V to 5.5V supply, featuring 2 MHz clock rate at 5V, self-timed 10 ms max write cycle, and automotive-grade temperature range (−40°C to +85°C) in 8-lead JEDEC SOIC package. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules.

For engineers reviewing the AT93C46-10SI-1.8 datasheet, AT93C46-10SI-1.8 pinout, AT93C46-10SI-1.8 application, or AT93C46-10SI-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8V, x8/x16 organization flexibility via ORG pin, 1 million write endurance, 100-year data retention, and compatibility with space-constrained PCB layouts using standard SOIC footprint.

Technical Context

The AT93C46-10SI-1.8 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with start-bit–driven instruction decoding and no external erase cycle required. Its internal organization is dynamically selected by the ORG pin state - high for 64 × 16 mode, ground for 128 × 8 mode - and supports full read/write/erase functionality including ERAL and WRAL commands valid only at VCC ≥ 4.5V.

Timing is strictly controlled by SK clock edges: data output on DO is synchronized to rising SK edges during READ; CS must remain low for ≥250 ns before status sampling; and tWP (10 ms max) governs write completion. The device enters Erase/Write Disable (EWDS) state on power-up and requires explicit EWEN instruction to enable programming - ensuring robust data integrity in noisy environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1024 bits (128 × 8 or 64 × 16 words), enabling compact firmware parameter or calibration storage without external address latches.
Supply Voltage Range	1.8V to 5.5V - supports direct interfacing with 1.8V logic families and legacy 5V systems without level-shifting.
Max Clock Frequency	2 MHz at VCC = 5V - enables fast configuration reads during system boot (<50 µs for full 128-byte read).
Write Cycle Time	10 ms maximum - deterministic timing allows precise host software timeout handling without polling overhead.
Endurance & Retention	1 million write cycles and 100 years data retention - suitable for field-updatable calibration tables in industrial equipment.
Operating Temperature	−40°C to +85°C - qualified for use in automotive body control modules and factory automation controllers.
Interface Protocol	Three-wire serial (CS/SK/DI/DO) with start-bit framing - reduces MCU GPIO count and simplifies routing on dense PCBs.

Pinout & Package

AT93C46-10SI-1.8 is housed in an 8-lead JEDEC SOIC (8S1) package, 4.80 mm × 6.20 mm body, 1.27 mm pitch, gull-wing leads, RoHS-compliant and halogen-free.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable: initiates instruction decode sequence; must be held low for ≥250 ns before SK edge to ensure valid command capture.
SK	Serial Clock	Input clock synchronizing all data transfers; rising edge clocks data into DI and out of DO; frequency up to 2 MHz at 5V.
DI	Data Input	Serial instruction and address/data input; accepts 7-bit start bit + op code + address + data per WRITE/ERASE command.
DO	Data Output	Open-drain output providing read data or Ready/Busy status (logic '1' = ready, '0' = busy during write/erase).
GND	Ground Reference	Primary return path for VCC current and signal reference; requires low-impedance connection to minimize noise coupling.
VCC	Power Supply	Single 1.8V–5.5V supply powering core logic and I/O; bypass capacitor (0.1 µF) recommended near pin for stable operation.
ORG	Organization Select	Logic-high selects 64 × 16 mode; grounded selects 128 × 8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up (not supported on 1.8V variants).
DC	No Connect	Internally unused terminal; must be left floating or tied to GND/VCC per layout best practice - no functional impact.

Key Features

Feature	Design Value
User-selectable memory organization	Runtime-configurable 128 × 8 or 64 × 16 word structure via ORG pin - eliminates need for multiple part numbers across design variants.
Self-timed write cycle	Fixed 10 ms max duration with no external timing components - simplifies firmware design and guarantees predictable latency.
Low-power standby mode	0.1 µA max ISB1 at 1.8V - enables battery-backed applications such as smart sensors with multi-year shelf life.
Automotive-grade qualification	−40°C to +85°C operation with lead-free/halogen-free packaging - meets AEC-Q200 stress test requirements for under-hood use.
Robust data protection	Power-on EWDS default state and explicit EWEN/EWDS instruction control - prevents accidental writes during brown-out or reset conditions.

Applications

Industrial PLC Configuration Storage	Automotive Body Control Module
Use Scenario: Storing I/O mapping, scaling factors, and fault thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent settings updated infrequently but requiring guaranteed retention over 10+ years. Use Value: 100-year data retention and 1M write cycles eliminate field recalibration service visits; 1.8V operation enables direct integration with low-power ARM Cortex-M0+ MCUs.	Use Scenario: Saving door lock actuator calibration, mirror position offsets, and seat memory profiles in automotive body control units. IC Role / Device Role / Timing Role: Dedicated EEPROM for safety-critical parameter storage, isolated from main MCU flash to prevent corruption during firmware updates. Use Value: −40°C to +85°C rating ensures reliability across extreme ambient conditions; three-wire interface minimizes trace count on congested automotive PCBs.
Medical Infusion Pump Calibration	Smart Energy Meter Firmware Settings
Use Scenario: Holding flow-rate calibration coefficients and alarm thresholds in Class II medical devices requiring regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with write-protection enforced by EWDS instruction after initial setup. Use Value: 1.8V compatibility allows direct connection to ultra-low-power MSP430 MCUs; 10 ms write time enables quick recalibration during service mode.	Use Scenario: Storing tariff schedules, metering constants, and communication parameters in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: Secure, long-life nonvolatile memory for metrology-critical values that must survive 20+ years of field deployment. Use Value: 100-year data retention and AEC-Q200 alignment provide confidence in lifetime accuracy; SOIC package supports automated optical inspection in high-volume production.

Industrial PLC Configuration Storage

Automotive Body Control Module

Use Scenario: Storing I/O mapping, scaling factors, and fault thresholds in programmable logic controllers deployed in factory environments.

IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent settings updated infrequently but requiring guaranteed retention over 10+ years.

Use Value: 100-year data retention and 1M write cycles eliminate field recalibration service visits; 1.8V operation enables direct integration with low-power ARM Cortex-M0+ MCUs.

Use Scenario: Saving door lock actuator calibration, mirror position offsets, and seat memory profiles in automotive body control units.

IC Role / Device Role / Timing Role: Dedicated EEPROM for safety-critical parameter storage, isolated from main MCU flash to prevent corruption during firmware updates.

Use Value: −40°C to +85°C rating ensures reliability across extreme ambient conditions; three-wire interface minimizes trace count on congested automotive PCBs.

Medical Infusion Pump Calibration

Smart Energy Meter Firmware Settings

Use Scenario: Holding flow-rate calibration coefficients and alarm thresholds in Class II medical devices requiring regulatory traceability.

IC Role / Device Role / Timing Role: Tamper-resistant configuration store with write-protection enforced by EWDS instruction after initial setup.

Use Value: 1.8V compatibility allows direct connection to ultra-low-power MSP430 MCUs; 10 ms write time enables quick recalibration during service mode.

Use Scenario: Storing tariff schedules, metering constants, and communication parameters in ANSI C12.22-compliant utility meters.

IC Role / Device Role / Timing Role: Secure, long-life nonvolatile memory for metrology-critical values that must survive 20+ years of field deployment.

Use Value: 100-year data retention and AEC-Q200 alignment provide confidence in lifetime accuracy; SOIC package supports automated optical inspection in high-volume production.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Microchip AT93C46A-10SI-1.8	Revised version with enhanced ORG pin behavior: supports x16 mode even when ORG is unconnected at 1.8V, unlike original AT93C46.	Preferred for new designs requiring simplified board layout (no pull-up/pull-down on ORG) and guaranteed x16 operation at low voltage.	Select AT93C46A-10SI-1.8 when ORG pin flexibility and long-term supply assurance are critical; it supersedes AT93C46-10SI-1.8 per Microchip documentation.
ON Semiconductor CAT93C46VI-GT3	Pin-compatible 1K-bit EEPROM with identical SOIC-8 footprint, 1.8V–5.5V operation, and 2 MHz clock, but rated for industrial temp only (−40°C to +85°C), not automotive.	Suitable for commercial/industrial applications where AEC-Q200 qualification is not required; lower cost alternative with same timing and instruction set.	Choose CAT93C46VI-GT3 for cost-sensitive non-automotive designs needing drop-in replacement with verified interoperability in existing schematics.

Compared with AT93C46-10SI-1.8, the AT93C46A-10SI-1.8 resolves ORG pin ambiguity at 1.8V and extends product lifecycle support, while CAT93C46VI-GT3 offers identical electrical behavior without automotive qualification - enabling trade-offs between reliability assurance and BOM cost.

Availability

AT93C46-10SI-1.8 is available at Aetrix Electronics and suitable for industrial control systems, automotive electronics, medical instrumentation, and smart metering applications requiring stable component supply and long-term obsolescence management.

Supply support for AT93C46-10SI-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 semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.

The AT93C46-10SI-1.8 belongs to Microchip's legacy serial EEPROM family designed for reliable, low-pin-count nonvolatile storage in resource-constrained embedded systems across industrial, automotive, and consumer markets.

FAQ

What is the maximum clock frequency supported by AT93C46-10SI-1.8?

The AT93C46-10SI-1.8 supports up to 2 MHz clock frequency at VCC = 5.0V, 1 MHz at 2.7V ≤ VCC ≤ 5.5V, and 0.25 MHz at 1.8V ≤ VCC ≤ 5.5V. These limits are defined in Table 4 AC Characteristics and ensure reliable data transfer timing margins across the full voltage range. The AT93C46-10SI-1.8 must operate within these specified fSK values to guarantee correct instruction decoding and data integrity.

Does AT93C46-10SI-1.8 require an external erase cycle before writing?

No, the AT93C46-10SI-1.8 performs self-timed erase internally during each WRITE or ERASE instruction - no separate erase command or cycle is needed. The device automatically erases the target memory location before programming new data, completing the full operation within the 10 ms maximum tWP window. This behavior is inherent to the AT93C46-10SI-1.8 architecture and eliminates firmware complexity associated with pre-erase management.

How is memory organization selected on AT93C46-10SI-1.8?

Memory organization (128 × 8 or 64 × 16) on the AT93C46-10SI-1.8 is selected by the logic level applied to the ORG pin: connect ORG to VCC for x16 mode, to GND for x8 mode. Unlike higher-voltage variants, the 1.8V version does not support unconnected ORG with internal pull-up - the pin must be actively driven. This configuration directly determines address width and data bus width used during READ/WRITE operations in the AT93C46-10SI-1.8.

What is the purpose of the DC pin on AT93C46-10SI-1.8?

The DC (Don't Connect) pin on AT93C46-10SI-1.8 is an internally unused terminal with no electrical function. It must be left floating in the circuit - neither connected to VCC nor GND - to avoid unintended interactions with internal circuitry. This pin exists due to package pinout standardization across the AT93C46/56/66 family and has no impact on AT93C46-10SI-1.8 operation or timing.

Is AT93C46-10SI-1.8 suitable for automotive applications?

Yes, the AT93C46-10SI-1.8 is explicitly qualified for automotive-grade use with extended temperature operation from −40°C to +85°C and lead-free/halogen-free packaging compliant with AEC-Q200 stress testing requirements. Its robust write-protection scheme (EWEN/EWDS), 1 million endurance cycles, and 100-year data retention make it appropriate for body control modules, dashboard instrumentation, and other non-safety-critical automotive subsystems where the AT93C46-10SI-1.8 provides proven reliability.

AT93C46-10SI-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

AT93C46-10SI-1.8 FAQ

1.How can I place an order for AT93C46-10SI-1.8 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT93C46-10SI-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 AT93C46-10SI-1.8 reliable?

The price and inventory of AT93C46-10SI-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 AT93C46-10SI-1.8 is usually 5 days.

3.What payment methods are accepted for AT93C46-10SI-1.8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C46-10SI-1.8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT93C46-10SI-1.8?

AT93C46-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT93C46-10SI-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 AT93C46-10SI-1.8?

For technical support, including AT93C46-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C46-10SI-1.8 requirements.

6.How does Aetrix verify that AT93C46-10SI-1.8 is sourced from the original manufacturer or authorized distributors?

All AT93C46-10SI-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 AT93C46-10SI-1.8 meets industry standards.

7.What is the process for return or replacement of AT93C46-10SI-1.8?

All AT93C46-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C46-10SI-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 AT93C46-10SI-1.8 part is unused and in its original packaging.

Return procedure for AT93C46-10SI-1.8:

1.Submit a request within 90 days.

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

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