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Microchip Technology 93C46BT-E/MS
- Part No.:
- 93C46BT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C46BT-E/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,069
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Product details
Overview
93C46BT-E/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial-temperature operation (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), and Ready/Busy status signaling via DO pin. Used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 93C46BT-E/MS datasheet, 93C46BT-E/MS pinout, 93C46BT-E/MS application, or 93C46BT-E/MS equivalent, this page delivers verified electrical specs, package mapping to MSOP-8, functional timing behavior, real-world use scenarios, and two validated alternative parts for design flexibility and supply continuity.
Technical Context
The 93C46BT-E/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (fixed 8-bit organization). It uses internal auto-erase before write, supports ERAL (6 ms) and WRAL (15 ms) commands requiring ≥4.5 V, and enters EWDS mode at power-up for data protection.
Its timing is defined by TCSL (250 ns min), TPD (≤400 ns at 1.8 V), and TWC (2 ms write cycle), with VCC detect threshold at 3.8 V for POR. The device operates only within its specified 4.5–5.5 V VCC range and does not support 16-bit mode or ORG configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; no 16-bit mode support. |
| VCC operating range | 4.5 V to 5.5 V - operation prohibited below 4.5 V; POR threshold at 3.8 V ensures reliable startup. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C compatibility; no ORG pin. |
| Write endurance | 1,000,000 erase/write cycles - rated at 25°C and VCC = 5.0 V; not extrapolated to other conditions. |
| Data retention | Greater than 200 years - specified under normal operating conditions; not accelerated-test derived. |
| Temperature grade | Industrial (I): –40°C to +85°C - no automotive (E) qualification; E-temp variants exist but are distinct part numbers. |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - AC timing valid only within specified voltage/temperature ranges. |
Pinout & Package
93C46BT-E/MS is housed in an 8-lead MSOP (Mini Small Outline Package) with 0.65 mm pitch, Pb-free Matte Tin finish, and exposed pad option (not connected per datasheet). Pin 1 marked by laser dot; pin 1 ID corner confirmed per Microchip DS20001749K-page 24.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CS (Chip Select) | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge for 93C devices. |
| 2 | CLK (Serial Clock) | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stopped clocks allowed pre-start condition. |
| 3 | DI (Data In) | Accepts Start bit, opcode, address, and write data; tied high with CS to detect Start condition. |
| 4 | DO (Data Out) | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or after status read. |
| 5 | VSS | Ground reference; all timing and logic levels referenced to this node. |
| 6 | NC | No internal connection - pin 6 is unconnected; not used for ORG or any function in 93C46B/T variants. |
| 7 | VCC | Power supply input; must be ≥4.5 V for ERAL/WRAL; POR circuit activates at 3.8 V. |
| 8 | ORG/NC | No internal connection - ORG pin absent on all 'A' and 'B' versions including 93C46B; pin 8 is NC per Device Selection Table and Pin Function Table. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | 2 ms typical cycle time (TWC) eliminates need for external timing control or polling overhead beyond R/B status. |
| Automatic ERAL before WRAL | WRAL command internally executes ERAL first - ensures full array erase before bulk write without separate instruction sequence. |
| Power-on/off data protection | VCC monitor disables all operations below 3.8 V - prevents corruption during brown-out or power ramp. |
| Ready/Busy status signaling | DO pin outputs active-low busy signal - enables efficient polling without dedicated status register or interrupt line. |
| Industry-standard 3-wire interface | Compatible with legacy Microwire controllers - requires only three GPIO lines and no level-shifting for 5 V systems. |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Backup |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed infrequently during boot or maintenance; retains values across power cycles. Use Value: Eliminates need for external battery-backed RAM; 200-year retention ensures lifetime calibration integrity without recalibration. |
Use Scenario: Holding user-modifiable settings (e.g., display brightness, network timeout, alarm thresholds) in medical infusion pumps. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to MCU GPIO; accessed via Microwire protocol during initialization. Use Value: Low pin count (3-wire) saves MCU resources; 1M endurance supports frequent field updates over product lifetime. |
| Firmware Parameter Archiving | Legacy Industrial Controller Upgrade Module |
|
Use Scenario: Archiving bootloader version, secure boot keys, and hardware revision IDs in industrial gateways supporting field firmware updates. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for critical boot metadata; accessed only during firmware validation phase. Use Value: VCC lockout at 3.8 V prevents key corruption during unstable power; EWEN/EWDS commands add software-level write protection. |
Use Scenario: Retrofitting legacy PLC backplanes with nonvolatile storage for module identification and diagnostics history. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 93C46 series parts in space-constrained MSOP footprints. Use Value: MSOP-8 package matches footprint of prior 93C46A/B variants; identical timing and command set ensures zero firmware changes. |
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/MS | Same 128×8-bit organization, MSOP-8 package, and 4.5–5.5 V range; differs only in temperature grade (I vs. E). | Rated for industrial (–40°C to +85°C) only - not qualified for automotive (–40°C to +125°C) environments. | Select 93C46B-I/MS if operating ambient stays ≤+85°C and cost sensitivity favors non-automotive grade. |
| 93LC46B-I/MS | 2.5–5.5 V VCC range, same MSOP-8 package and 128×8-bit organization; includes ORG pin (NC on 93C46B but present on 93LC46B). | Supports wider supply range and dual-voltage systems; ORG pin unused but present - may require PCB layout review. | Choose 93LC46B-I/MS when system VCC varies below 4.5 V (e.g., 3.3 V rails); verify ORG pin termination per design. |
Compared with 93C46BT-E/MS, 93C46B-I/MS offers identical functionality at lower cost for non-automotive use, while 93LC46B-I/MS extends supply flexibility down to 2.5 V but introduces an unused ORG pin that must be tied.
Availability
93C46BT-E/MS is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration backup, and firmware parameter archiving requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93C46BT-E/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed for low-pin-count, low-power nonvolatile storage in cost-sensitive industrial and consumer systems where Microwire interface compatibility and robust data retention are essential.
FAQ
What is the memory organization of the 93C46BT-E/MS?
The 93C46BT-E/MS has a fixed 128 × 8-bit (1 Kbit) organization. It belongs to the 'B' variant group and does not include an ORG pin - therefore, it does not support 16-bit mode or word-size selection. This is confirmed in the Device Selection Table and Pin Function Table of DS20001749K, where ORG is marked "No" and "NC" for all 93C46B variants including 93C46BT-E/MS.
Does the 93C46BT-E/MS support 16-bit communication?
No, the 93C46BT-E/MS does not support 16-bit communication. As a 'B'-suffix device with no ORG pin, it is hardwired to 8-bit operation. The datasheet explicitly states that 93C46B devices provide "dedicated 16-bit communication" only in error - correction: Table 1 confirms 93C46B is 128 × 8-bit; true 16-bit variants are 64 × 16-bit (e.g., 93C46B in x16 config requires ORG, which 93C46BT-E/MS lacks). Thus, 93C46BT-E/MS is strictly x8.
What is the minimum VCC required for ERAL and WRAL operations on the 93C46BT-E/MS?
The 93C46BT-E/MS requires VCC ≥ 4.5 V for proper execution of both ERAL (Erase All) and WRAL (Write All) commands. This is specified in Figures 2-3, 2-4, 2-10, and 2-11 of DS20001749K, and reinforced in Section 2.5 and 2.9 with explicit notes stating "VCC must be ≥4.5V for proper operation of ERAL/WRAL." Operation below 4.5 V disables these functions.
Is the ORG pin present on the 93C46BT-E/MS?
No, the ORG pin is not present on the 93C46BT-E/MS. Per the Device Selection Table and Pin Function Table, ORG is "No" for all 93C46A/B variants. In the MSOP-8 package drawing (DS20001749K-page 24), pin 8 is labeled "ORG/NC" and footnote clarifies "ORG pin is NC on A/B devices." For 93C46BT-E/MS, pin 8 is a no-connect terminal with no internal function.
What is the maximum clock frequency supported by the 93C46BT-E/MS?
The 93C46BT-E/MS supports a maximum clock frequency of 3 MHz when VCC is between 4.5 V and 5.5 V. This value is specified in Table 1-2 (A1: FCLK) of DS20001749K. At lower voltages (e.g., <4.5 V), the device is not rated for operation; thus, 3 MHz is the absolute maximum usable frequency under its valid operating conditions.
93C46BT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93C46BT-E/MS FAQ
1.How can I place an order for 93C46BT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BT-E/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 93C46BT-E/MS reliable?
The price and inventory of 93C46BT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46BT-E/MS is usually 5 days.
3.What payment methods are accepted for 93C46BT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BT-E/MS?
93C46BT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BT-E/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 93C46BT-E/MS?
For technical support, including 93C46BT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BT-E/MS requirements.
6.How does Aetrix verify that 93C46BT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93C46BT-E/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 93C46BT-E/MS meets industry standards.
7.What is the process for return or replacement of 93C46BT-E/MS?
All 93C46BT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BT-E/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 93C46BT-E/MS part is unused and in its original packaging.
Return procedure for 93C46BT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46BT-E/MS Tags
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