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Microchip Technology 93LC46BT-I/ST
- Part No.:
- 93LC46BT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46BT-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:23,169
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Product details
Overview
The 93LC46BT-I/ST from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating over 2.5–5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in an 8-lead TSSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46BT-I/ST datasheet, 93LC46BT-I/ST pinout, 93LC46BT-I/ST application, or 93LC46BT-I/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), TSSOP-8 footprint compatibility, 6 ms program cycle time, 1 million endurance cycles, and support for sequential read and write-all operations in space-constrained industrial control modules.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (as confirmed by 'A' suffix and Device Selection Table). Communication uses rising-edge clocking for opcode/address/data input and output, with DO providing both data output and Ready/Busy status during programming.
Internal architecture includes auto-erase-before-write logic, EWEN/EWDS command-based write protection, and on-chip voltage detection (VPOR = 1.5 V typical) that inhibits all operations below VCC threshold. The 128 × 8-bit memory array supports single-byte erase/write and full-array ERAL/WRAL commands, with timing fully specified across 2.5–5.5 V and −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit); fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware address handling. |
| VCC range | 2.5 V to 5.5 V; supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles; enables reliable long-term field calibration or parameter logging in industrial equipment. |
| Data retention | Greater than 200 years at 25°C; ensures nonvolatile storage integrity over product lifetime without refresh. |
| Program cycle time | 6 ms max (TWC); deterministic timing allows precise host CPU scheduling of write operations. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); minimal GPIO usage, compatible with legacy PIC® and AVR MCU peripherals. |
| Temp grade | Industrial (−40°C to +85°C); qualified for use in motor drives, PLC I/O modules, and HVAC controllers. |
Pinout & Package
Package: 8-lead TSSOP (ST), 3.0 mm × 4.4 mm body, 0.65 mm pitch, Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 ID corner indicated on top marking.
| 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 mode. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock high/low times defined per VCC (e.g., 200 ns min at 4.5–5.5 V). |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied to DO only with series resistor to avoid bus conflict. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS goes low after operation. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; requires low-impedance connection to system ground plane. |
| 6 (NC) | No Internal Connection | Not bonded; must be left floating or tied to VSS - no electrical function or routing requirement. |
| 7 (ORG) | Organization Select | NC on 93LC46A/B devices; not present in this part - memory fixed at 8-bit word size. |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; internal POR circuit (1.5 V threshold) blocks operations during brown-out conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host MCU initiates operation and polls DO for completion. |
| Automatic ERAL before WRAL | Ensures clean memory state prior to full-array write, preventing partial-data corruption without firmware overhead. |
| Power-on/off data protection | Hardware-level lockout below 1.5 V VCC prevents inadvertent writes during power ramp-up/down sequences. |
| Ready/Busy status on DO | Single-pin status reporting reduces pin count and enables real-time polling without additional control lines. |
| Sequential read function | Enables efficient bulk read of configuration blocks (e.g., 128 bytes) with continuous CS high and minimal clock cycles. |
Applications
| Motor Control Configuration Storage | Industrial Sensor Calibration Data |
|---|---|
Use Scenario: Storing motor phase alignment offsets, current limit thresholds, and PID tuning parameters in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at startup and updated during field calibration routines. Use Value: Enables plug-and-play motor replacement without reprogramming MCU firmware - parameters persist across power cycles and firmware updates. | Use Scenario: Retaining factory-calibrated gain/offset coefficients and temperature compensation tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Dedicated calibration memory mapped via SPI-like Microwire interface during sensor initialization. Use Value: Achieves ±0.1% measurement accuracy over temperature without requiring recalibration in end-user equipment. |
| PLC I/O Module Parameter Set | Medical Device Safety Settings |
Use Scenario: Holding user-defined input filter time constants, output drive modes, and watchdog timeout values in modular PLC base units. IC Role / Device Role / Timing Role: System-level configuration store accessed by ARM Cortex-M host during boot and runtime reconfiguration. Use Value: Supports hot-swap I/O module replacement while preserving site-specific operational settings without network reconfiguration. | Use Scenario: Securing critical safety thresholds (e.g., maximum infusion rate, temperature cutoffs) in battery-powered portable medical pumps. IC Role / Device Role / Timing Role: Tamper-resistant parameter vault with hardware write-protection (EWDS/EWEN) and brown-out immunity. Use Value: Meets IEC 62304 Class B software safety requirements by ensuring life-critical settings survive power loss and ESD events. |
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/ST | 16-bit organization (64 × 16), same VCC/temp/package - requires ORG pin tie (not applicable here), different instruction set addressing. | Used where 16-bit MCU data paths dominate; incompatible with existing 8-bit firmware addressing logic. | Select only if migrating to 16-bit word access and redesigning host driver code. |
| AT25010B-SSHL-T | 1 Kbit SPI interface (4-wire), 1.8–5.5 V, 5 MHz max clock, same endurance and retention - different protocol and pinout (SOIC-8). | Requires SPI peripheral instead of Microwire; not drop-in replaceable due to CS/CLK/DI/DO signal mapping differences. | Choose when upgrading to higher-speed serial interface and board layout allows SOIC-8 footprint change. |
Compared with 93LC46B-I/ST and AT25010B-SSHL-T, the 93LC46BT-I/ST provides guaranteed 8-bit Microwire compatibility, TSSOP-8 footprint optimization for dense layouts, and seamless integration with legacy Microchip PIC® and Atmel AVR designs using existing driver libraries.
Availability
The 93LC46BT-I/ST is available at Aetrix Electronics and suitable for industrial control systems, motor drive configuration storage, and sensor calibration data retention requiring stable component supply across extended production lifecycles.
Supply support for 93LC46BT-I/ST 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, serving automotive, industrial, consumer, and communications markets.
The 93LC46BT-I/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-power, cost-sensitive embedded systems requiring robust nonvolatile storage with minimal pin count and proven reliability in harsh environments.
FAQ
What is the memory organization of the 93LC46BT-I/ST?
The 93LC46BT-I/ST has a fixed 128 × 8-bit (1 Kbit) organization - it is an 'A'-suffix device with no ORG pin, meaning word size is permanently configured for 8-bit communication. This eliminates external ORG pin routing and simplifies firmware design versus 'C'-suffix variants that require external logic level selection.
Does the 93LC46BT-I/ST support sequential read operations?
Yes, the 93LC46BT-I/ST supports sequential read: when CS remains high after a READ instruction, the internal address counter automatically increments, allowing consecutive memory locations to be read with each subsequent clock cycle - reducing host MCU overhead for bulk configuration retrieval.
What is the maximum clock frequency supported by the 93LC46BT-I/ST?
The 93LC46BT-I/ST supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V, 2 MHz at 2.5–4.5 V, and 1 MHz at 1.8–2.5 V. Since this part operates from 2.5–5.5 V, its usable range is 2–3 MHz depending on supply voltage - verified in Table 1-2 AC Characteristics.
How does write protection work on the 93LC46BT-I/ST?
The 93LC46BT-I/ST uses EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands: it powers up in EWDS mode, blocking all erase/write until EWEN is issued. After programming, executing EWDS restores protection - preventing accidental overwrites during noise events or power transients.
Is the 93LC46BT-I/ST RoHS compliant and lead-free?
Yes, the 93LC46BT-I/ST is RoHS compliant and features a Pb-free Matte Tin (Sn) finish on its TSSOP-8 package terminals, meeting JEDEC standard J-STD-609A for lead-free marking - confirmed in the Device Selection Table and Packaging Information section.
93LC46BT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 64 x 16
- 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:
- 8-TSSOP
93LC46BT-I/ST FAQ
1.How can I place an order for 93LC46BT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT-I/ST 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 93LC46BT-I/ST reliable?
The price and inventory of 93LC46BT-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46BT-I/ST is usually 5 days.
3.What payment methods are accepted for 93LC46BT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT-I/ST?
93LC46BT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT-I/ST 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 93LC46BT-I/ST?
For technical support, including 93LC46BT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT-I/ST requirements.
6.How does Aetrix verify that 93LC46BT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46BT-I/ST 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 93LC46BT-I/ST meets industry standards.
7.What is the process for return or replacement of 93LC46BT-I/ST?
All 93LC46BT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT-I/ST, 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 93LC46BT-I/ST part is unused and in its original packaging.
Return procedure for 93LC46BT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46BT-I/ST Tags
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