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Microchip Technology 93C46AXT-I/SN
- Part No.:
- 93C46AXT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46AXT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,776
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Product details
Overview
93C46AXT-I/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all before write-all, power-on/off data protection, and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers and sensor calibration data retention.
For engineers reviewing the 93C46AXT-I/SN datasheet, 93C46AXT-I/SN pinout, 93C46AXT-I/SN application, or 93C46AXT-I/SN equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), SOIC-8 package, 2 ms program cycle time, 1 million endurance cycles, and compatibility with legacy Microwire-based microcontroller peripherals.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring a Start bit detection followed by opcode, address, and data transmission on rising CLK edges. Its internal logic enforces EWEN/EWDS protocol for write protection, and Ready/Busy polling is performed by reading DO while CS is high after TCSL ≥250 ns.
Unlike C-variant parts, the 93C46A has no ORG pin and operates exclusively in 8-bit mode. Erase and write operations are initiated by the rising edge of CLK on the final data bit (not CS falling edge), and VCC must remain ≥4.5 V for ERAL and WRAL commands to function reliably.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 words × 8 bits); supports single-byte read/write without external address latching |
| VCC range | 4.5 V to 5.5 V; incompatible with 3.3 V or 2.5 V systems - requires dedicated 5 V rail or regulator |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); no SPI mode or 4-wire option |
| Write cycle time | 2 ms typical (TWC); enables rapid firmware parameter updates without blocking host MCU for >1 ms |
| Endurance | 1,000,000 erase/write cycles; suitable for field-updatable calibration tables with daily writes over 27 years |
| Data retention | 200 years at 85°C; ensures long-term reliability in unpowered industrial deployments |
| Temperature grade | Industrial (–40°C to +85°C); validated across full range - not rated for automotive (125°C) |
Pinout & Package
93C46AXT-I/SN is supplied in an 8-lead SOIC package (SN suffix), with 150-mil body width and Pb-free Matte Tin finish. Pin 1 is marked by laser dot; pin 1 ID corner is bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICCS ≤ 5 µA) |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock frequency up to 3 MHz at 4.5–5.5 V; stoppable mid-transfer |
| 3 (DI) | Data Input | Accepts Start bit, opcodes (e.g., 01 for WRITE), 7-bit address, and 8-bit data; no internal pull-up |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); high-Z when CS low or during non-read states |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; must be low-impedance connection to system GND plane |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND per layout best practice - no routing required |
| 7 (NC) | No Connect | Same as Pin 6; dual NC pins confirm absence of ORG functionality in A-variant devices |
| 8 (VCC) | Power Supply | 4.5–5.5 V only; internal POR triggers at ~3.8 V; decoupling capacitor (0.1 µF ceramic) required within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delays - host only polls DO for completion |
| Automatic ERAL before WRAL | Ensures full array overwrite without separate erase command - reduces firmware complexity and bus traffic |
| Power-on/off data protection | Hardware lockout below ~3.8 V prevents corruption during brown-out or hot-plug events |
| Ready/Busy status on DO | Enables non-blocking operation: host continues other tasks while waiting for write completion |
| 128 × 8-bit fixed organization | Simplifies address decoding and eliminates ORG pin routing - ideal for space-constrained 8-bit MCU designs |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot or maintenance mode; reads occur once per power cycle, writes only during calibration. Use Value: Guarantees coefficient persistence across 200-year shelf life and 1M write cycles - eliminates recalibration labor in deployed equipment. |
Use Scenario: Holding user-defined I/O mapping, communication baud rates, and alarm thresholds in HVAC control panels. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to 8-bit MCU GPIOs; accessed via Microwire peripheral or bit-banged software driver. Use Value: Enables field reconfiguration without firmware reflashing - reduces service downtime and support costs. |
| Legacy Automotive Subsystem | Medical Device Parameter Storage |
|
Use Scenario: Retaining seat position memory and mirror angle settings in older vehicle modules using 5 V microcontrollers. IC Role / Device Role / Timing Role: Low-pin-count EEPROM co-located with MCU; communicates over dedicated 3-wire bus isolated from CAN/LIN networks. Use Value: Meets AEC-Q100 Class 2 thermal requirements (–40°C to +85°C) and provides immunity to voltage transients during ignition cycling. |
Use Scenario: Saving patient-specific therapy parameters and usage logs in portable infusion pumps with battery backup. IC Role / Device Role / Timing Role: Fail-safe data logger; writes triggered by button press or end-of-dose event; verified via DO polling before power-down. Use Value: 200-year data retention ensures audit trail integrity over product lifetime - satisfies FDA 21 CFR Part 11 record-keeping expectations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46A-I/SN | Wider VCC range (2.5–5.5 V); same 128 × 8-bit organization and SOIC-8 package | Supports 3.3 V systems; lacks 93C46A's 4.5–5.5 V optimization for noise immunity and margin | Select if migrating to mixed-voltage designs or replacing obsolete 3.3 V EEPROMs - verify VCC stability during write cycles |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit capacity, 1.8–5.5 V operation, 5 ms write cycle | Requires additional chip select line and SPI peripheral; slower write timing but broader voltage flexibility | Choose when upgrading to SPI-based platforms or consolidating EEPROM sourcing across multiple Atmel-compatible designs |
Compared with 93LC46A-I/SN and AT25010B-SSHL-T, the 93C46AXT-I/SN offers the fastest write cycle (2 ms) and highest noise margin (4.5–5.5 V only), making it optimal for legacy 5 V industrial controls where timing predictability and EMI resilience are critical.
Availability
93C46AXT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and legacy automotive subsystems requiring stable component supply with guaranteed long-term continuity.
Supply support for 93C46AXT-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 components, and memory solutions, headquartered in Chandler, Arizona.
The 93C46A belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-pin-count 5 V embedded systems requiring robust nonvolatile storage with minimal firmware overhead.
FAQ
What is the function of the NC pins on the 93C46AXT-I/SN?
The 93C46AXT-I/SN has two No-Connect (NC) pins - Pin 6 and Pin 7 - because it is the 'A' variant of the 93C46 family and lacks the ORG pin used in 'C' variants to select 8-bit vs. 16-bit organization. These pins are internally unconnected and must be left floating or tied to ground per PCB layout guidelines; they do not affect 93C46AXT-I/SN operation or timing.
Can the 93C46AXT-I/SN operate at 3.3 V?
No, the 93C46AXT-I/SN cannot operate at 3.3 V. Its specified VCC range is strictly 4.5 V to 5.5 V, and its internal power-on reset (POR) activates at ~3.8 V. Attempting to power the 93C46AXT-I/SN at 3.3 V will result in undefined behavior, failed writes, and potential data corruption - use 93LC46A-I/SN instead for 2.5–5.5 V compatibility.
How does the Ready/Busy status work on the 93C46AXT-I/SN DO pin?
During an erase or write operation, the DO pin of the 93C46AXT-I/SN outputs Ready/Busy status: logic low indicates the operation is still in progress, and logic high means completion. To read this status, CS must first be held low for ≥250 ns (TCSL), then brought high; DO becomes valid after TSV (up to 500 ns). The 93C46AXT-I/SN does not require continuous clocking during this poll.
Is the 93C46AXT-I/SN pin-compatible with the 93C46B-I/SN?
No, the 93C46AXT-I/SN is not pin-compatible with the 93C46B-I/SN. While both share the same SOIC-8 package and pinout numbering, the 93C46B is organized as 64 × 16-bit and expects 16-bit data transfers, whereas the 93C46AXT-I/SN is strictly 128 × 8-bit. Swapping them will cause misaligned reads/writes and data corruption unless firmware is modified to match word size.
What is the maximum clock frequency supported by the 93C46AXT-I/SN?
The 93C46AXT-I/SN supports a maximum clock frequency of 3 MHz when VCC is between 4.5 V and 5.5 V. This is confirmed in Table 1-2 (A1 parameter) of the official datasheet DS20001749K. At lower voltages (outside its operating range), timing margins degrade - the 93C46AXT-I/SN is not characterized or guaranteed for operation below 4.5 V.
93C46AXT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- 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
93C46AXT-I/SN FAQ
1.How can I place an order for 93C46AXT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AXT-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 93C46AXT-I/SN reliable?
The price and inventory of 93C46AXT-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 93C46AXT-I/SN is usually 5 days.
3.What payment methods are accepted for 93C46AXT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AXT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AXT-I/SN?
93C46AXT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AXT-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 93C46AXT-I/SN?
For technical support, including 93C46AXT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AXT-I/SN requirements.
6.How does Aetrix verify that 93C46AXT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93C46AXT-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 93C46AXT-I/SN meets industry standards.
7.What is the process for return or replacement of 93C46AXT-I/SN?
All 93C46AXT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AXT-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 93C46AXT-I/SN part is unused and in its original packaging.
Return procedure for 93C46AXT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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