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Microchip Technology 93C46AT-E/OT
- Part No.:
- 93C46AT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93C46AT-E/OT.pdf
- Description:
- IC EEPROM 1KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
93C46AT-E/OT from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, VCC range of 4.5–5.5 V, and industrial temperature grade (−40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers and power management systems.
For engineers reviewing the 93C46AT-E/OT datasheet, 93C46AT-E/OT pinout, 93C46AT-E/OT application, or 93C46AT-E/OT equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOT-23-6 package, 2 ms program cycle time, 1 million endurance cycles, and compatibility with legacy Microwire host controllers requiring strict timing compliance at 5 V.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating on rising-edge clocking. It uses internal auto-erase prior to write, supports sequential read, and enforces EWEN/EWDS command-based write enable/disable logic to prevent accidental overwrites.
Power-on reset circuitry disables all programming functions until VCC exceeds 3.8 V; standby current is ≤1 µA at I-temp. The SOT-23-6 package (OT suffix) places DO on pin 6, CS on pin 3, CLK on pin 4, DI on pin 5, VSS on pin 2, and VCC on pin 1 - with ORG and NC pins omitted per A/B-series design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit organization; no ORG pin - fixed x8 mode) |
| VCC Range | 4.5 V to 5.5 V - requires ≥4.5 V for ERAL and WRAL operations |
| Program Cycle Time | 2 ms - self-timed erase+write; enables deterministic firmware delay handling |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V |
| Data Retention | 200 years - guaranteed nonvolatile storage under rated conditions |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI mode or dual I/O |
| Temperature Range | −40°C to +85°C (Industrial grade) - qualified per Microchip's I-temp specification |
Pinout & Package
93C46AT-E/OT is supplied in a Pb-free 6-lead SOT-23 package (OT suffix), measuring 2.9 mm × 1.6 mm × 1.1 mm, with matte tin (Sn) finish and exposed pad optional for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply input - must be ≥4.5 V for full functionality including ERAL/WRAL |
| 2 | VSS | Ground reference - common return for all signals and internal logic |
| 3 | CS | Chip Select - active-high; minimum 250 ns low time (TCSL) required between commands |
| 4 | CLK | Serial clock input - rising edge clocks all opcode, address, and data bits |
| 5 | DI | Data Input - receives Start bit, instructions, addresses, and write data |
| 6 | DO | Data Output / Ready-Busy - outputs read data or indicates programming status (low = busy) |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - firmware waits only for DO high or timeout |
| Automatic ERAL before WRAL | Ensures full array erase prior to bulk write - prevents partial data corruption during WRAL |
| Power-on/off data protection | Hardware lockout below 3.8 V - prevents spurious writes during brown-out or power ramp |
| Ready/Busy status on DO | Enables polling-based operation without dedicated status lines - reduces MCU GPIO count |
| 1 µA standby current (I-temp) | Supports ultra-low-power battery-backed applications - e.g., energy meter configuration memory |
Applications
| Industrial Sensor Calibration | Embedded Power Supply Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC or process control transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed at startup and during field recalibration. Use Value: Maintains calibration integrity across 200-year retention and 1M-cycle field updates without external supervision. |
Use Scenario: Holding output voltage/current setpoints and protection thresholds in programmable DC-DC modules. IC Role / Device Role / Timing Role: Microwire-configurable parameter store interfaced to microcontroller during initialization. Use Value: Enables field-upgradable power profiles while meeting IEC 62368-1 safety isolation requirements via hardware write-disable. |
| Legacy Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|
Use Scenario: Retaining module identification, channel mapping, and diagnostic history in DIN-rail mounted I/O expanders. IC Role / Device Role / Timing Role: Serial EEPROM supporting deterministic 3-wire timing at 5 V for real-time diagnostics logging. Use Value: Delivers 2 ms write latency and 1 µA sleep current - critical for fanless, convection-cooled enclosures. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in non-safety-critical BCU subsystems. IC Role / Device Role / Timing Role: Configuration memory compliant with AEC-Q100 Class 2 (−40°C to +105°C ambient) when derated. Use Value: Provides automotive-grade reliability with 1M endurance - sufficient for >10-year vehicle lifetime at typical usage rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-I/SN | Wider VCC range (2.5–5.5 V); SOIC-8 package; same 128×8 organization | Supports lower-voltage microcontrollers (e.g., 3.3 V ARM Cortex-M0); requires PCB layout change | Choose for mixed-voltage systems needing broader supply tolerance and standard SOIC footprint |
| 93AA46AT-I/OT | Lower VCC range (1.8–5.5 V); identical SOT-23-6 package and pinout | Enables direct replacement in 1.8–3.3 V designs; retains same board space and routing | Choose when migrating to lower-power hosts while preserving mechanical compatibility |
Compared with 93C46AT-E/OT, the 93LC46AT-I/SN offers greater supply flexibility but larger footprint, while the 93AA46AT-I/OT maintains identical packaging and enables voltage scaling - making it the only drop-in alternative for space-constrained 1.8–3.3 V upgrades.
Availability
93C46AT-E/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power supply configuration, and legacy PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for 93C46AT-E/OT 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource overhead and strict Microwire protocol compliance.
FAQ
What is the function of the ORG pin on the 93C46AT-E/OT?
The 93C46AT-E/OT does not have an ORG pin - it belongs to the 'A' variant family (93C46A), which provides fixed 8-bit organization. The ORG pin is only present on 'C' variants (e.g., 93C46C) to select between x8/x16 modes. On 93C46AT-E/OT, memory is permanently configured as 128 × 8-bit, eliminating external configuration logic.
Can the 93C46AT-E/OT operate at 3.3 V?
No, the 93C46AT-E/OT requires a minimum VCC of 4.5 V and is specified only for 4.5–5.5 V operation. Attempting to power it at 3.3 V will disable programming functions (ERAL, WRAL, WRITE) and may cause unpredictable read behavior. For 3.3 V systems, consider the 93LC46AT-I/SN or 93AA46AT-I/OT instead.
How is write protection implemented on the 93C46AT-E/OT?
Write protection is enforced through hardware voltage detection and command sequencing: the device inhibits all programming when VCC < 3.8 V, and requires explicit EWEN (Erase/Write Enable) before any ERASE, WRITE, or WRAL instruction. After each write, issuing EWDS restores protection - a critical safeguard against firmware glitches or noise-induced commands.
What is the maximum clock frequency supported by the 93C46AT-E/OT?
The 93C46AT-E/OT supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. This is confirmed in Table 1-2 (A1 parameter) of the datasheet. Clock timing margins (TCKH ≥ 200 ns, TCKL ≥ 100 ns) must be maintained; exceeding 3 MHz risks setup/hold violations and command rejection.
Does the 93C46AT-E/OT support SPI communication?
No, the 93C46AT-E/OT implements only the Microwire protocol - a 3-wire synchronous interface (CS, CLK, DI/DO) with specific instruction encoding and timing. It lacks SPI-specific features such as bidirectional data lines, mode selection, or frame synchronization. Direct SPI host connection requires protocol translation or software bit-banging.
93C46AT-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
93C46AT-E/OT FAQ
1.How can I place an order for 93C46AT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AT-E/OT 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 93C46AT-E/OT reliable?
The price and inventory of 93C46AT-E/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46AT-E/OT is usually 5 days.
3.What payment methods are accepted for 93C46AT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AT-E/OT?
93C46AT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AT-E/OT 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 93C46AT-E/OT?
For technical support, including 93C46AT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AT-E/OT requirements.
6.How does Aetrix verify that 93C46AT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93C46AT-E/OT 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 93C46AT-E/OT meets industry standards.
7.What is the process for return or replacement of 93C46AT-E/OT?
All 93C46AT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AT-E/OT, 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 93C46AT-E/OT part is unused and in its original packaging.
Return procedure for 93C46AT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46AT-E/OT Tags
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