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Microchip Technology 93C46B-I/MS
- Part No.:
- 93C46B-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C46B-I/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,708
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Product details
Overview
93C46B-I/MS from Microchip Technology Inc. is a 1K-bit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, industrial temperature rating (−40°C to +85°C), and MSOP-8 package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93C46B-I/MS datasheet, 93C46B-I/MS pinout, 93C46B-I/MS application, or 93C46B-I/MS equivalent, key selection criteria include guaranteed 16-bit word organization (no ORG pin), 2 ms program cycle time, 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire host controllers requiring minimal I/O overhead.
Technical Context
The 93C46B-I/MS implements a synchronous serial Microwire protocol with fixed 16-bit word addressing (64 words), no ORG pin dependency, and instruction-set-driven operation including READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS. Communication requires CS, CLK, and DI/DO lines with strict timing constraints on TCKH/TCKL and TCSL.
Its internal architecture includes an address decoder, data register, mode decode logic, and output buffer, with power-on data protection triggered at VCC ≥ 3.8 V. Programming cycles are initiated by CLK rising edge (not CS falling edge), distinguishing it from 93AA/93LC variants, and require EWEN prior to any write/erase command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 × 16-bit organization - fixed, no ORG pin) |
| VCC Range | 4.5 V to 5.5 V - supports standard 5 V systems only; no 3.3 V or 2.5 V operation |
| Program Cycle Time | 2 ms - enables fast firmware/config updates without host CPU blocking longer than 2 ms |
| Endurance | 1,000,000 erase/write cycles - suitable for high-frequency calibration or logging applications |
| Data Retention | 200 years at 25°C - ensures long-term reliability in unattended equipment |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires no additional level-shifting for 5 V microcontrollers |
| Temperature Range | Industrial: −40°C to +85°C - qualified for industrial control, metering, and automotive body electronics |
Pinout & Package
8-pin MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad optional (VSS or floating).
| 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 |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; controls all bit transfers; stopped clock allowed during transmission |
| 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 low or after status read |
| 5 (VSS) | Ground | Reference for all signals; connects to exposed pad if used |
| 6 (NC) | No Internal Connection | Not bonded; must be left unconnected or tied to VSS per layout best practice |
| 7 (ORG) | Organization Select | NC on 93C46B - not connected internally; must be left floating or tied to VSS (not VCC) |
| 8 (VCC) | Power Supply | 4.5–5.5 V only; POR threshold at 3.8 V ensures data protection during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 16-bit word organization | Eliminates external ORG logic and simplifies host driver design for 16-bit microcontrollers |
| Self-timed erase/write with auto-erase | Removes need for host timing loops; guarantees completion within 2 ms regardless of voltage/temp |
| Ready/Busy status on DO pin | Enables polling-based operation without interrupt lines or additional GPIOs |
| EWEN/EWDS write protection | Prevents accidental overwrites during power transitions or software faults; powers up in locked state |
| RoHS-compliant MSOP-8 package | Supports high-density PCB layouts with thermal performance comparable to SOIC but 40% smaller footprint |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in programmable logic controllers (PLCs) and RTUs. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot or field recalibration; uses READ/WRITE with 2 ms latency. Use Value: Enables field-upgradable calibration without firmware reflash; 1M endurance supports >100 recalibrations/year over 10+ years. | Use Scenario: Holding bootloader parameters, network MAC addresses, and user preferences in HVAC controllers and smart meters. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU SPI/Microwire peripheral; accessed infrequently but with guaranteed data integrity. Use Value: Eliminates need for larger flash or battery-backed RAM; 200-year retention ensures lifetime data persistence without maintenance. |
| Automotive Body Control Module | Legacy Industrial Controller Upgrade |
Use Scenario: Storing seat/mirror position presets and lighting profiles in 12 V automotive systems with 5 V LDO regulation. IC Role / Device Role / Timing Role: Dedicated 5 V EEPROM for nonvolatile user settings; operates across −40°C to +85°C ambient. Use Value: Qualified industrial temp grade meets AEC-Q100 Class 2 requirements for under-hood proximity; no derating needed. | Use Scenario: Replacing obsolete 93C46B-P or 93C46B-SN in legacy PLC backplanes where board space is constrained. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement in MSOP-8 footprint; identical timing and instruction set. Use Value: Enables direct PCB reuse with zero layout changes; same 4.5–5.5 V VCC and 2 ms TWC ensure functional equivalence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46B-I/SN | Same 64×16-bit organization, 4.5–5.5 V, −40°C to +85°C, but in 8-lead SOIC package (5.0 mm × 4.0 mm) | Requires PCB redesign for larger footprint; better thermal mass but higher board area cost | Select for ease of hand-soldering, rework, or legacy SOIC socket compatibility |
| 93LC46B-I/MS | Same MSOP-8 package and pinout, but wider VCC range (2.5–5.5 V); supports 3.3 V systems | Enables dual-voltage designs; however, 93LC46B has 6 ms TWC vs. 2 ms for 93C46B - impacts real-time update latency | Select when system operates at 3.3 V or mixed-voltage domains; verify timing budget accommodates slower write |
Compared with 93C46B-I/SN and 93LC46B-I/MS, the 93C46B-I/MS delivers the fastest program cycle (2 ms) in the smallest industrial-grade 5 V EEPROM footprint, making it optimal for space-constrained, latency-sensitive 5 V embedded systems where 3.3 V operation is unnecessary.
Availability
93C46B-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for 93C46B-I/MS 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal host resource usage - targeting industrial, automotive, and consumer control applications.
FAQ
What is the memory organization of the 93C46B-I/MS?
The 93C46B-I/MS has a fixed 64 × 16-bit (1 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and is permanently configured for 16-bit word access - eliminating external configuration logic and simplifying host interface design for 16-bit microcontrollers.
Does the 93C46B-I/MS support 3.3 V operation?
No. The 93C46B-I/MS requires 4.5 V to 5.5 V supply voltage. Its power-on reset threshold is 3.8 V, and operation below 4.5 V is not specified or guaranteed. For 3.3 V systems, consider the 93LC46B-I/MS instead.
How is write protection implemented on the 93C46B-I/MS?
The 93C46B-I/MS powers up in Erase/Write Disable (EWDS) mode. An EWEN instruction must be issued before any ERASE or WRITE command executes. After programming, issuing EWDS re-enables protection - preventing accidental writes during power transients or software errors.
What is the maximum clock frequency supported by the 93C46B-I/MS?
At VCC = 4.5–5.5 V, the 93C46B-I/MS supports up to 3 MHz clock frequency (FCLK). This allows high-speed configuration reads and minimizes bus occupancy time during frequent parameter access in real-time systems.
Is the 93C46B-I/MS pin-compatible with other 93C46B packages?
Yes - the 93C46B-I/MS shares identical pin functions and electrical timing with all 93C46B variants (e.g., 93C46B-I/SN, 93C46B-I/P). The MSOP-8 package maintains the same pin 1 orientation, signal mapping, and mechanical compatibility for drop-in replacement where board space permits.
93C46B-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not 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:
- 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-MSOP
93C46B-I/MS FAQ
1.How can I place an order for 93C46B-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46B-I/MS 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 93C46B-I/MS reliable?
The price and inventory of 93C46B-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46B-I/MS is usually 5 days.
3.What payment methods are accepted for 93C46B-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46B-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46B-I/MS?
93C46B-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46B-I/MS 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 93C46B-I/MS?
For technical support, including 93C46B-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46B-I/MS requirements.
6.How does Aetrix verify that 93C46B-I/MS is sourced from the original manufacturer or authorized distributors?
All 93C46B-I/MS 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 93C46B-I/MS meets industry standards.
7.What is the process for return or replacement of 93C46B-I/MS?
All 93C46B-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C46B-I/MS, 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 93C46B-I/MS part is unused and in its original packaging.
Return procedure for 93C46B-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46B-I/MS Tags
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