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Microchip Technology 93LC46BT-I/MC
- Part No.:
- 93LC46BT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93LC46BT-I/MC.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:748
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Product details
Overview
93LC46BT-I/MC from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in an 8-lead 2×3 DFN package. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93LC46BT-I/MC datasheet, 93LC46BT-I/MC pinout, 93LC46BT-I/MC application, or 93LC46BT-I/MC equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), DFN package footprint, 2.5–5.5 V supply range, industrial temp grade, and Microwire protocol timing compliance at up to 2 MHz (VCC = 2.5 V).
Technical Context
The 93LC46BT-I/MC implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed 128 × 8-bit memory organization. It uses CMOS EEPROM technology with on-chip charge pump for write/erase operations, requiring no external high-voltage programming supply.
Its functional architecture includes a 128-word × 8-bit memory array, instruction decode logic, address counter, and output buffer. Ready/Busy status is signaled via DO pin during erase/write, and all programming requires prior EWEN command; device powers up in EWDS (write-disabled) state for data integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit); supports compact nonvolatile storage for calibration data, device IDs, or user settings. |
| VCC range | 2.5 V to 5.5 V; compatible with 3.3 V and 5 V logic systems without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); minimal GPIO usage, no I²C pull-ups required. |
| Write endurance | 1,000,000 erase/write cycles; suitable for frequent field updates in industrial control firmware. |
| Data retention | Greater than 200 years at +25°C; ensures long-term reliability in unpowered storage applications. |
| Max clock frequency | 2 MHz at VCC = 2.5 V; enables fast configuration reads in low-power battery-operated devices. |
| Operating temperature | −40°C to +85°C (Industrial grade); validated for use in automotive body electronics and industrial PLC modules. |
| Package | 8-lead 2×3 mm DFN (MC); exposes thermal pad for improved heat dissipation in dense PCB layouts. |
Pinout & Package
8-lead 2×3 mm DFN package (Microchip designation MC) with exposed thermal pad (optional VSS connection). Pin 1 marked by laser dot; pinout matches standard 93LC46x DFN layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CS | Chip Select active-high; must be held low ≥250 ns between instructions to reset internal logic. |
| 2 | CLK | Serial clock input; rising edge clocks opcode/address/data; stoppable mid-transfer for master flexibility. |
| 3 | DI | Data Input; accepts Start bit, opcodes (e.g., 01 for WRITE), addresses, and 8-bit data. |
| 4 | DO | Data Output / Ready-Busy indicator; outputs read data or logic 0 (busy) during erase/write. |
| 5 | NC | No internal connection; electrically isolated; must not be connected to any signal or supply. |
| 6 | ORG | No internal connection on 93LC46B variants; pin is unused and may be left floating or tied to VSS/VCC. |
| 7 | VSS | Ground reference; connects to PCB ground plane; exposed pad recommended to tie to same net. |
| 8 | VCC | Power supply; decoupling capacitor (0.1 µF) required within 5 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control; TWC = 6 ms typical per byte/word, simplifying firmware timing loops. |
| Automatic ERAL before WRAL | Ensures full array erase before bulk write, preventing partial-data corruption during firmware update sequences. |
| Power-on/off data protection | Hardware-level VCC monitoring (VPOR = 1.5 V threshold) blocks writes when supply is unstable or ramping. |
| Ready/Busy status via DO | Enables polling-based write completion detection without interrupt lines or additional GPIOs. |
| Low standby current | ICCS ≤ 1 µA at I-temp; critical for battery-backed real-time clocks and energy-harvesting sensor nodes. |
| RoHS-compliant Pb-free finish | Matte tin (Sn) termination meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1) for reflow compatibility. |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients and tariff tables that persist across power cycles and firmware updates. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via MCU SPI-like Microwire interface during boot or maintenance mode. Use Value: 128 × 8-bit capacity holds 16+ calibration parameters; 200-year retention ensures accuracy over product lifetime without backup battery. | Use Scenario: Holding I/O mapping, PID loop constants, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Serial EEPROM interfaced to ARM Cortex-M host MCU using GPIO-banged Microwire protocol. Use Value: Industrial temp rating (−40°C to +85°C) and 1M endurance support daily parameter adjustments in harsh environments. |
| Automotive Body Control Module | Medical Diagnostic Device Settings |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in vehicle body control units (BCUs). IC Role / Device Role / Timing Role: Low-power serial memory accessed during wake-up sequence; powered from 3.3 V rail with tight current budget. Use Value: 1 µA standby current extends sleep-mode battery life; DFN package fits space-constrained BCU PCBs. | Use Scenario: Retaining user-selected test modes, calibration offsets, and language preferences in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure configuration store isolated from main application processor; accessed only during initialization or service mode. Use Value: Hardware write-protection (EWDS/EWEN) prevents accidental overwrite during field servicing or 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 |
|---|---|---|---|
| 93LC46BT-I/SN | Same electrical specs and 8-bit organization, but in 8-lead SOIC package (SN) instead of DFN (MC). | SOIC offers easier hand-soldering and prototyping; DFN provides smaller footprint and better thermal performance. | Select SN for development boards or low-volume assembly; choose MC for production miniaturization and thermal management. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (not Microwire); operates down to 1.8 V; 20 MHz max clock; different instruction set and timing. | Requires SPI driver adaptation; lacks ERAL/WRAL auto-erase; higher speed but no hardware VCC lockout below 1.5 V. | Use only if migrating to SPI infrastructure; verify firmware rewrite for instruction mapping and status polling logic. |
Compared with 93LC46BT-I/SN, the 93LC46BT-I/MC saves 60% board area and improves thermal coupling; versus AT25010B-MAHL-T, it retains Microwire compatibility and hardware power-fail protection but trades off maximum clock speed for robustness in low-VCC operation.
Availability
93LC46BT-I/MC is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and automotive body control module designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC46BT-I/MC 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 93LC46 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and simple protocol overhead.
FAQ
What is the memory organization of the 93LC46BT-I/MC?
The 93LC46BT-I/MC is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - confirming it is a 'B' variant in the 93LC46 family. Unlike 'C' versions, it does not support dynamic 8/16-bit reconfiguration; all read/write operations use 8-bit data words and 7-bit addresses. This simplifies firmware implementation and eliminates external ORG pin routing.
Does the 93LC46BT-I/MC require an external high-voltage supply for programming?
No, the 93LC46BT-I/MC does not require an external high-voltage supply. It integrates an on-chip charge pump that generates the necessary programming voltage from the standard 2.5–5.5 V VCC rail. All erase and write operations are fully self-timed and initiated solely via the Microwire interface - no external HV circuitry or timing control is needed.
How is write protection implemented on the 93LC46BT-I/MC?
Write protection on the 93LC46BT-I/MC is implemented through dual mechanisms: hardware VCC monitoring (VPOR = 1.5 V) blocks all programming when supply drops below threshold, and software-controlled EWEN/EWDS commands enable/disable erase/write functions. The device powers up in EWDS (disabled) state; an explicit EWEN instruction is mandatory before any ERASE or WRITE operation.
Can the 93LC46BT-I/MC be used with a 3.3 V microcontroller GPIO interface?
Yes, the 93LC46BT-I/MC is fully compatible with 3.3 V microcontrollers. Its VIH1 threshold is 2.0 V (min) for VCC ≥ 2.7 V, and VOL1 is ≤ 0.4 V at IOL = 2.1 mA - meeting standard 3.3 V CMOS logic levels. No level-shifting circuitry is required when interfacing with 3.3 V MCUs such as STM32, PIC32, or NXP LPC series.
What is the significance of the 'T' and 'I' in the part number 93LC46BT-I/MC?
In 93LC46BT-I/MC, 'T' denotes tape-and-reel packaging (standard for automated SMT assembly), and 'I' specifies Industrial temperature grade (−40°C to +85°C). The '/MC' suffix identifies the 8-lead 2×3 mm DFN package with exposed thermal pad. Together, they define the complete orderable configuration for production use.
93LC46BT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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-DFN (2x3)
93LC46BT-I/MC FAQ
1.How can I place an order for 93LC46BT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT-I/MC 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/MC reliable?
The price and inventory of 93LC46BT-I/MC 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/MC is usually 5 days.
3.What payment methods are accepted for 93LC46BT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT-I/MC?
93LC46BT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT-I/MC 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/MC?
For technical support, including 93LC46BT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT-I/MC requirements.
6.How does Aetrix verify that 93LC46BT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93LC46BT-I/MC 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/MC meets industry standards.
7.What is the process for return or replacement of 93LC46BT-I/MC?
All 93LC46BT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT-I/MC, 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/MC part is unused and in its original packaging.
Return procedure for 93LC46BT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46BT-I/MC Tags
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