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Microchip Technology AT93C46A-10SI
- Part No.:
- AT93C46A-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C46A-10SI.pdf
- Description:
- IC EEPROM 1KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,463
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Product details
Overview
AT93C46A-10SI from Microchip Technology (formerly Atmel) is a 1K-bit, 64-word × 16-bit serial EEPROM with three-wire interface, operating from 2.7V to 5.5V, featuring 1 million write cycles, 100-year data retention, and industrial temperature range (−40°C to +85°C). It is packaged in an 8-lead JEDEC SOIC and used for configuration storage in microcontroller-based industrial control modules.
For engineers reviewing the AT93C46A-10SI datasheet, AT93C46A-10SI pinout, AT93C46A-10SI application, or AT93C46A-10SI equivalent, key selection considerations include VCC voltage range compatibility (2.7–5.5V), self-timed 10 ms max write cycle, three-wire serial protocol timing constraints, and SOIC-8 package footprint requirements.
Technical Context
The AT93C46A-10SI implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-set-driven operation including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Memory organization is fixed at 64 × 16-bit words, with no internal address pointer or auto-increment logic.
It uses CMOS EEPROM technology with on-chip charge-pump circuitry enabling write/erase without external high-voltage supply. Write enable state is controlled explicitly via EWEN/EWDS instructions, and ready/busy status is reported dynamically on DO during active programming cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1024 bits (64 words × 16 bits); supports fixed-width 16-bit read/write transfers only |
| Supply Voltage | 2.7V to 5.5V; enables direct interfacing with 3.3V and 5V microcontrollers without level shifting |
| Write Cycle Time | Max 10 ms; self-timed - no external polling or timeout management required beyond tWP |
| Endurance | 1 million write cycles; sufficient for firmware revision logging or calibration parameter updates over 10+ years of field use |
| Data Retention | 100 years at +25°C; validated for long-term storage of device IDs, calibration coefficients, and security keys |
| Operating Temp | −40°C to +85°C; qualified for industrial control, automotive body electronics, and power supply monitoring systems |
| Interface Speed | 2 MHz max clock (at 5V); limits burst throughput to ~32 kbps but ensures robust noise immunity in noisy environments |
Pinout & Package
AT93C46A-10SI is supplied in an 8-lead JEDEC-standard SOIC package (package code 8S1), 0.150" wide body, with gull-wing leads and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; controls DO high-impedance state when deasserted |
| SK | Serial Clock | Input-only; rising edge samples DI and shifts DO; requires stable 250 ns min high/low time at 2.7V |
| DI | Data Input | Serial instruction and address/data input; accepts start bit + op code + 6-bit address + 16-bit data per WRITE |
| DO | Data Output | Tri-state output; delivers read data, ready/busy status (logic 0 = busy), or high-Z when CS high |
| GND | Ground Reference | Primary return path for VCC current and signal reference; requires low-impedance PCB connection |
| VCC | Power Supply | Single supply input; powers internal logic and EEPROM array; bypass capacitor (0.1 µF) required near pin |
| DC | Device Configuration | No-connect pin; internally tied to VCC or GND depending on factory option; must be left unconnected |
| NC | No Connect | Unused internal node; electrically isolated; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Three-wire serial interface | Reduces MCU GPIO count vs. SPI/I²C; eliminates need for dedicated bus controller or pull-up resistors on DO |
| Self-timed write cycle | Removes requirement for external write-complete interrupt or fixed delay loops; simplifies firmware integration |
| Erase/write enable/disable control | Prevents accidental overwrites via explicit EWEN/EWDS commands; critical for field-upgradable embedded systems |
| Ready/busy status reporting | Enables real-time polling on DO during write/erase; avoids worst-case 10 ms timeouts in time-critical applications |
| Automotive-grade qualification | Validated for extended temperature and reliability; meets AEC-Q100 stress test requirements for non-safety-critical ECUs |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and network settings in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime reconfiguration; operates at ≤1 MHz clock to tolerate EMI in motor drive environments. Use Value: Enables field updates without hardware change; 1M endurance supports >100 firmware revisions over product lifetime. | Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation curves for MEMS pressure sensors in HVAC equipment. IC Role / Device Role / Timing Role: Calibration memory mapped into sensor subsystem; read once per power-on, written only during production test or recalibration. Use Value: Eliminates manual potentiometer adjustment; 100-year retention guarantees accuracy across full product service life. |
| Power Supply Monitoring Unit | Embedded Gateway Bootloader Settings |
Use Scenario: Recording fault logs, overvoltage/overcurrent event timestamps, and thermal shutdown history in AC/DC power supplies for telecom infrastructure. IC Role / Device Role / Timing Role: Event-logging memory with infrequent writes (<100/year); accessed via low-speed MCU GPIO bit-banging due to absence of hardware SPI. Use Value: Provides root-cause diagnostics without adding FRAM or external flash; 2.7V operation ensures functionality during brown-out conditions. | Use Scenario: Storing secure boot flags, firmware signature verification keys, and dual-bank swap indicators in industrial gateways running Linux-based edge software. IC Role / Device Role / Timing Role: Trusted configuration store accessed early in boot sequence; write-protected via EWDS after initial setup to prevent tampering. Use Value: Supports secure OTA update workflows without cryptographic co-processor; SOIC-8 footprint fits tight PCB space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95128-DRMN6TP/K | 128 Kbit (16K × 8), SPI interface, 5 MHz max clock, 1.8–5.5V supply | Higher density, faster interface, but requires SPI hardware peripheral and different command set | Select when migrating to higher-capacity storage with existing SPI infrastructure and firmware support |
| BR24G12-3SPI | 1 Kbit (128 × 8), I²C interface, 1 MHz max clock, 1.7–5.5V supply, built-in write protection | Different protocol (I²C), smaller word size, integrated WP pin for hardware lock | Choose for designs already using I²C buses and requiring simple hardware write-disable without software EWDS command |
Compared with M95128-DRMN6TP/K and BR24G12-3SPI, the AT93C46A-10SI offers deterministic three-wire timing, minimal GPIO usage, and proven industrial reliability in SOIC-8 - making it optimal for cost-sensitive, space-constrained, or legacy MCU platforms lacking SPI/I²C peripherals.
Availability
AT93C46A-10SI is available at Aetrix Electronics and suitable for industrial control systems, smart sensor modules, and power supply monitoring units requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT93C46A-10SI 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 nonvolatile memory solutions, with broad industrial and automotive qualification coverage.
The AT93C46A-10SI belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and high-reliability configuration storage in resource-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the AT93C46A-10SI at 3.3V operation?
The AT93C46A-10SI supports up to 1 MHz SK clock frequency when VCC = 2.7V to 3.6V, as specified in Table 4 under "2.7V ≤ VCC ≤ 5.5V" condition. This is derived from the tSKH/tSKL minimum of 250 ns, yielding a 2 MHz theoretical limit, but the datasheet specifies 1 MHz as the guaranteed operational maximum for reliable timing margin at lower voltages. The AT93C46A-10SI must be operated within this limit to ensure correct instruction decoding and data integrity.
Does the AT93C46A-10SI require an external high-voltage supply for write operations?
No, the AT93C46A-10SI integrates an on-chip charge pump that generates the required programming voltage from the standard VCC supply (2.7V–5.5V). No external high-voltage source or pump circuitry is needed. All write and erase functions - including WRITE, ERASE, ERAL, and WRAL - execute autonomously using only the main VCC rail. This feature is inherent to the AT93C46A-10SI design and eliminates board-level complexity associated with HV generation.
Can the AT93C46A-10SI be used in place of the AT93C46D-10SI without hardware changes?
No - the AT93C46A-10SI and AT93C46D-10SI differ in memory organization: AT93C46A is 64 × 16-bit (16-bit words), while AT93C46D is 128 × 8-bit (8-bit words). They share identical pinout and electrical specs, but instruction addressing and data width are incompatible. Firmware must be modified to handle 8-bit vs. 16-bit transfers, and the AT93C46A-10SI cannot be substituted without software adaptation.
What is the function of the DC pin on the AT93C46A-10SI?
The DC pin on the AT93C46A-10SI is a device configuration pin tied internally to either VCC or GND during manufacturing to select default memory organization mode. It is not user-controllable and must be left unconnected (NC) in all designs. The AT93C46A-10SI variant is factory-configured for 64 × 16-bit organization, and the DC pin has no functional role in normal operation. Leaving it floating is mandatory per the AT93C46A-10SI datasheet.
Is the AT93C46A-10SI compatible with 1.8V-only systems?
No - the AT93C46A-10SI is the 2.7V–5.5V version (denoted by "-2.7" suffix). For 1.8V operation, the correct part is AT93C46A-10SI-1.8. Although both share the same SOIC-8 package and pinout, the -2.7 variant is not characterized or guaranteed to operate below 2.7V. Attempting to run the AT93C46A-10SI at 1.8V may result in failed writes, read corruption, or undefined behavior per its absolute minimum VCC specification.
AT93C46A-10SI 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C46A-10SI FAQ
1.How can I place an order for AT93C46A-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C46A-10SI 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 reliable?
The price and inventory of AT93C46A-10SI 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 is usually 5 days.
3.What payment methods are accepted for AT93C46A-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C46A-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C46A-10SI?
AT93C46A-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C46A-10SI 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?
For technical support, including AT93C46A-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C46A-10SI requirements.
6.How does Aetrix verify that AT93C46A-10SI is sourced from the original manufacturer or authorized distributors?
All AT93C46A-10SI 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 meets industry standards.
7.What is the process for return or replacement of AT93C46A-10SI?
All AT93C46A-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT93C46A-10SI, 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 part is unused and in its original packaging.
Return procedure for AT93C46A-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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