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Microchip Technology 93LC46AT-I/OTG
- Part No.:
- 93LC46AT-I/OTG
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93LC46AT-I/OTG.pdf
- Description:
- IC EEPROM 1KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
93LC46AT-I/OTG from Microchip Technology is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, -40°C to +85°C industrial temperature grade, and SOT-23-6 package. It provides nonvolatile storage for configuration data in microcontroller-based systems requiring low power, high endurance, and robust data retention.
For engineers reviewing the 93LC46AT-I/OTG datasheet, 93LC46AT-I/OTG pinout, 93LC46AT-I/OTG application, or 93LC46AT-I/OTG equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), 1 million erase/write cycles, 200+ year data retention, self-timed write with Ready/Busy status, and compatibility with legacy Microwire controllers in space-constrained designs.
Technical Context
The 93LC46AT-I/OTG implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin required, confirming fixed 8-bit x128 organization. It uses CMOS EEPROM technology with on-chip charge pump for internal voltage generation during write/erase operations.
Operation relies on start-bit detection (CS and DI high on CLK rising edge), followed by opcode (2 bits), address (7 bits), and data (8 bits) clocked in on CLK rising edges. The DO pin serves dual role: outputting read data and indicating Ready/Busy status during programming via active-low signaling when CS is reasserted after TCSL ≥250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 words × 8 bits) - fixed x8 organization; no ORG pin; suitable for byte-oriented configuration storage. |
| VCC Range | 2.5 V to 5.5 V - supports wide supply rails including 3.3 V and 5 V systems without level shifting. |
| Endurance | 1,000,000 erase/write cycles - enables frequent field updates (e.g., calibration, logging, firmware flags) over product lifetime. |
| Data Retention | Greater than 200 years at 25°C - ensures long-term reliability for unpowered storage in industrial equipment. |
| Write Cycle Time | 6 ms typical (TWC) - self-timed auto-erase-and-write eliminates need for external timing control or polling overhead beyond R/B check. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; compatible with legacy PIC® MCU peripherals and simple bit-banged controllers. |
| Temperature Range | -40°C to +85°C (Industrial grade) - validated for operation in embedded control, metering, and automotive body electronics environments. |
| Package | SOT-23-6 (OT) - 2.9 mm × 1.6 mm footprint; surface-mount; optimized for high-density PCB layouts. |
Pinout & Package
SOT-23-6 package (designator "OT") with 6 leads, Pb-free Matte Tin finish, and exposed pad option (not connected per datasheet). Pin 1 marked by laser dot; pin 1 ID corner defined per JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DO | Data Output / Ready-Busy Indicator | Tri-state output: delivers read data or asserts low during erase/write; requires CS high ≥250 ns after TCSL to sample status. |
| VSS | Ground Reference | Primary return path for all internal circuitry; must be low-impedance connection to system ground plane. |
| DI | Data Input | Serial input for start bit, opcodes, addresses, and write data; synchronized to CLK rising edge. |
| VCC | Power Supply | 2.5–5.5 V supply; internal POR triggers at ~1.5 V; decoupling capacitor (0.1 µF) recommended near pin. |
| CS | Chip Select | Active-high enable; device enters Standby mode when low; minimum 250 ns low time (TCSL) required between commands. |
| CLK | Serial Clock | Input clock synchronizing all data transfers; max 3 MHz at VCC ≥4.5 V; stops/resumes freely during transmission. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write with Auto-Erase | Eliminates external timing circuitry; write completes in ≤6 ms; reduces firmware complexity and interrupt latency. |
| Power-On/Off Data Protection | Internal voltage detector disables writes below ~1.5 V; prevents corruption during brown-out or hot-plug events. |
| Ready/Busy Status via DO Pin | Enables efficient polling instead of fixed delays; improves system responsiveness and avoids unnecessary wait states. |
| Sequential Read Function | Allows reading consecutive memory locations with single CS assertion - reduces transaction overhead in configuration dumps. |
| Industry Standard 3-Wire Serial I/O | Minimizes PCB routing (3 signal lines + VCC/VSS); interoperable with existing Microwire host drivers and legacy firmware stacks. |
| RoHS Compliant, Pb-Free Finish | Meets global environmental regulations; Matte Tin plating ensures reliable solderability and wire-bond compatibility. |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff tables, calibration coefficients, and tamper-event logs in electricity/water/gas meters operating across wide temperature ranges. IC Role / Device Role / Timing Role: Nonvolatile configuration and event storage EEPROM interfaced directly to metering SoC via Microwire. Use Value: 200+ year data retention ensures accuracy over meter lifetime; 1M endurance supports daily log writes for >2,700 years. | Use Scenario: Holding module identification, channel scaling factors, and fault history in DIN-rail mounted programmable logic controller I/O bases. IC Role / Device Role / Timing Role: Parameter storage peripheral accessed during boot and runtime diagnostics via microcontroller SPI/Microwire peripheral. Use Value: SOT-23-6 footprint saves board space in dense modular designs; -40°C to +85°C rating ensures reliability in factory-floor enclosures. |
| Automotive Body Control Units | Medical Diagnostic Handhelds |
Use Scenario: Saving user preferences, seat/mirror positions, and lighting profiles in BCMs where ECU space and BOM count are constrained. IC Role / Device Role / Timing Role: Low-pin-count EEPROM providing persistent settings storage with minimal GPIO usage. Use Value: 2.5–5.5 V operation interfaces natively with 3.3 V or 5 V MCU domains; no level shifter required. | Use Scenario: Storing calibration offsets, sensor IDs, and regulatory compliance flags in portable diagnostic devices subject to frequent battery cycling. IC Role / Device Role / Timing Role: Configuration memory holding critical operational parameters that must survive power loss and thermal stress. Use Value: Power-on protection prevents write corruption during battery insertion/removal; RoHS compliance meets medical device material requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/OTG | 16-bit (64 × 16) organization; same VCC range, package, and temperature grade. | Requires 16-bit data path and host software support for word-aligned addressing; not drop-in for byte-oriented systems. | Select only if system architecture mandates 16-bit data transfers and memory mapping aligns with x16 layout. |
| AT25010B-SSHL-T | 1 Kbit SPI interface (4-wire), 1.8–5.5 V, SOIC-8 package; no Ready/Busy pin; different command set. | Lacks DO-based R/B status; requires fixed delay or software timeout instead of hardware-pollable status. | Choose when migrating to SPI ecosystem or when SOIC-8 footprint is acceptable and R/B polling is not required. |
Compared with 93LC46B-I/OTG, the 93LC46AT-I/OTG offers native byte-level access without address alignment constraints; versus AT25010B-SSHL-T, it provides hardware-ready signaling and smaller SOT-23 footprint but requires Microwire-compatible host logic.
Availability
93LC46AT-I/OTG is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term data integrity, and compact packaging.
Supply support for 93LC46AT-I/OTG 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, with global design and manufacturing operations.
The 93LC46A/B/C series was designed specifically for cost-sensitive, low-power embedded systems needing reliable serial EEPROM with Microwire compatibility and extended temperature operation.
FAQ
What is the memory organization of the 93LC46AT-I/OTG?
The 93LC46AT-I/OTG is a fixed 128 × 8-bit (1 Kbit) EEPROM with no ORG pin - it implements dedicated x8 organization. This eliminates external configuration logic and simplifies host firmware, making it ideal for byte-addressable parameter storage in microcontroller applications. Unlike 'C' variants, the 'A' suffix confirms absence of ORG functionality.
Does the 93LC46AT-I/OTG support hardware Ready/Busy polling?
Yes, the 93LC46AT-I/OTG provides hardware Ready/Busy status via the DO pin. After initiating an erase or write cycle, asserting CS high for ≥250 ns allows sampling DO: low = busy, high = ready. This eliminates fixed delays and improves system efficiency - a key differentiator versus SPI EEPROMs lacking this feature.
What is the maximum clock frequency supported by the 93LC46AT-I/OTG?
The 93LC46AT-I/OTG supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V. At 2.5 V to <4.5 V, max clock is 2 MHz; at 1.8 V to <2.5 V, it drops to 1 MHz. These graded limits ensure reliable timing margin across its full 2.5–5.5 V operating range, as specified in Table 1-2 of DS20001749K.
Is the 93LC46AT-I/OTG RoHS compliant and lead-free?
Yes, the 93LC46AT-I/OTG is RoHS compliant and features a Pb-free Matte Tin (Sn) finish per JEDEC standards. The SOT-23-6 package marking includes the "3e" Pb-free designation, and the exposed pad (if present) may be connected to VSS or left floating - consistent with Microchip's packaging specification for this device family.
How does the 93LC46AT-I/OTG protect against inadvertent writes during power transitions?
The 93LC46AT-I/OTG incorporates built-in power-on/power-off protection: an internal voltage detector disables all write/erase functions when VCC falls below ~1.5 V. Additionally, it powers up in Erase/Write Disable (EWDS) mode, requiring an explicit EWEN command before any programming - preventing corruption during brown-out, reset, or hot-swap events.
93LC46AT-I/OTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
93LC46AT-I/OTG FAQ
1.How can I place an order for 93LC46AT-I/OTG through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AT-I/OTG 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 93LC46AT-I/OTG reliable?
The price and inventory of 93LC46AT-I/OTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46AT-I/OTG is usually 5 days.
3.What payment methods are accepted for 93LC46AT-I/OTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AT-I/OTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AT-I/OTG?
93LC46AT-I/OTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AT-I/OTG 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 93LC46AT-I/OTG?
For technical support, including 93LC46AT-I/OTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AT-I/OTG requirements.
6.How does Aetrix verify that 93LC46AT-I/OTG is sourced from the original manufacturer or authorized distributors?
All 93LC46AT-I/OTG 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 93LC46AT-I/OTG meets industry standards.
7.What is the process for return or replacement of 93LC46AT-I/OTG?
All 93LC46AT-I/OTG units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AT-I/OTG, 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 93LC46AT-I/OTG part is unused and in its original packaging.
Return procedure for 93LC46AT-I/OTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46AT-I/OTG Tags
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