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Microchip Technology 93C46BT-E/OT
- Part No.:
- 93C46BT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93C46BT-E/OT.pdf
- Description:
- IC EEPROM 1KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,397
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Product details
Overview
93C46BT-E/OT 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), power-on/off data protection, and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers, sensor calibration registers, and boot parameter retention.
For engineers reviewing the 93C46BT-E/OT datasheet, 93C46BT-E/OT pinout, 93C46BT-E/OT application, or 93C46BT-E/OT equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOT-23-6 package, 2 ms program cycle time, 1 million erase/write endurance, and compatibility with legacy Microwire-based microcontroller peripherals.
Technical Context
The 93C46BT-E/OT implements a synchronous serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-driven command execution. Its internal architecture includes an address decoder, mode decode logic, and output buffer, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on rising CLK edges.
Unlike C-variant parts, this A/B-series device lacks an ORG pin and is hardwired to 8-bit organization. Erase/write operations are initiated by the rising edge of CLK on the final data bit (not CS falling edge), and require VCC ≥ 4.5 V for ERAL/WRAL. Power-on reset circuitry holds the device in EWDS mode until explicitly enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; supports 128-byte sequential read/write. |
| VCC range | 4.5 V to 5.5 V - narrow supply window requiring stable 5 V rail; not compatible with 3.3 V or 2.5 V systems. |
| Program cycle time | 2 ms - self-timed write/erase duration; eliminates need for external timing control or polling overhead beyond R/B check. |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, 5.0 V; enables long-term field reconfiguration in industrial firmware updates. |
| Data retention | 200 years - guaranteed nonvolatile data hold at rated temperature; suitable for lifetime-critical calibration storage. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals without protocol translation. |
| Temperature grade | Industrial (−40°C to +85°C) - qualified for use in motor drives, PLC I/O modules, and industrial HMI panels. |
Pinout & Package
SOT-23-6 package (lead-free matte tin finish), 2.9 mm × 1.6 mm footprint, 0.95 mm height, gull-wing leads. Pin 1 marked by laser dot; pin 1 ID corner indicated on top marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Status | Tri-state output; delivers read data or logic-low busy signal during programming; high-Z when CS low or idle. |
| 2 (VCC) | Power Supply | 4.5–5.5 V input; internal POR triggers at ~3.8 V; must be ≥4.5 V for ERAL/WRAL execution. |
| 3 (DI) | Data Input | Serial input for opcodes, addresses, and write data; requires setup/hold timing relative to CLK rising edge. |
| 4 (CS) | Chip Select | Active-high enable; minimum 250 ns low time required between commands; resets internal state when held low. |
| 5 (CLK) | Serial Clock | Rising-edge synchronized interface; max 3 MHz at 4.5–5.5 V; clock may pause mid-transfer without error. |
| 6 (VSS) | Ground | Reference return path; decoupling capacitor (0.1 µF) required within 5 mm of VCC/VSS pins. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry; 2 ms internal cycle completes autonomously after instruction latch. |
| Automatic ERAL before WRAL | Ensures full array erasure prior to bulk write - prevents partial writes and data corruption without software intervention. |
| Power-on/off data protection | Hardware lockout below 3.8 V VCC prevents spurious writes during brown-out or hot-plug events. |
| Erase/write disable (EWDS) | Default power-up state blocks accidental programming; explicit EWEN required before any write/erase command. |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays; reduces CPU wait time and improves system responsiveness. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog front-ends in pressure or temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed at power-up; read-only during normal operation. Use Value: Maintains accuracy across 200-year lifespan without battery backup; immune to power-loss-induced corruption. |
Use Scenario: Holding user-defined I/O mapping, communication baud rates, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Configuration memory updated infrequently via service port; read at boot and runtime. Use Value: Enables field customization without firmware reflashing; 1M endurance supports decades of maintenance cycles. |
| Legacy MCU Boot Parameter Storage | Consumer Appliance Settings Retention |
Use Scenario: Saving bootloader jump address, security flags, and hardware revision ID in PIC16F-based designs. IC Role / Device Role / Timing Role: Microwire-compatible companion EEPROM interfaced directly to MCU's dedicated serial port. Use Value: Eliminates need for software bit-banging; deterministic 2 ms write ensures predictable boot sequence timing. |
Use Scenario: Preserving user preferences (e.g., display brightness, timer settings) across AC power cycles in smart thermostats. IC Role / Device Role / Timing Role: Low-power configuration store accessed only during setup or power-on reset. Use Value: 1 µA standby current minimizes energy drain in battery-backed or energy-harvesting appliances. |
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/OT | Wider VCC range (2.5–5.5 V); same 8-bit organization, SOT-23-6 package, and instruction set. | Supports 3.3 V systems; lacks 4.5 V minimum requirement for ERAL/WRAL - enables broader voltage flexibility. | Select when migrating to mixed-voltage designs or replacing obsolete 5 V-only controllers. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V operation, 1 Kbit x8, SOIC-8 package; no Ready/Busy pin. | Requires SPI master; no DO-based status polling - mandates fixed 5 ms write delay or software flag management. | Choose for new designs with SPI-native MCUs; avoid if legacy Microwire timing or R/B polling is required. |
Compared with 93LC46BT-I/OT, the 93C46BT-E/OT offers tighter VCC tolerance and higher noise immunity but sacrifices 3.3 V compatibility; versus AT25010B-MAHL-T, it retains Microwire timing predictability and hardware status signaling at the cost of interface standardization.
Availability
93C46BT-E/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and legacy MCU boot parameter storage requiring stable component supply across extended product lifecycles.
Supply support for 93C46BT-E/OT 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 series was designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal external components and direct compatibility with legacy Microwire peripherals.
FAQ
What is the memory organization of the 93C46BT-E/OT?
The 93C46BT-E/OT is a fixed 128 × 8-bit (1 Kbit) EEPROM with no ORG pin - unlike C-variant parts, it does not support x16 configuration. Its instruction set, address width (7 bits), and data framing are strictly optimized for 8-bit serial transfers, making it ideal for legacy 8-bit microcontroller interfaces.
Does the 93C46BT-E/OT support 3.3 V operation?
No, the 93C46BT-E/OT requires a minimum VCC of 4.5 V and operates only within 4.5–5.5 V. Attempting to power it at 3.3 V will prevent ERAL, WRAL, and write operations from executing correctly due to internal voltage detection thresholds (~3.8 V POR). For 3.3 V systems, consider the 93LC46BT-I/OT instead.
How is Ready/Busy status monitored on the 93C46BT-E/OT?
Ready/Busy status is signaled on the DO pin: logic low indicates active erase/write, logic high confirms completion. To sample it, CS must be brought high for ≥250 ns after initiating a command, then DO is sampled on CLK rising edges. The status remains valid until the next Start condition is detected.
What is the purpose of the EWEN and EWDS commands in the 93C46BT-E/OT?
EWEN (Erase/Write Enable) unlocks programming functions; the 93C46BT-E/OT powers up in EWDS (Erase/Write Disable) mode to prevent accidental writes. After each successful write, issuing EWDS restores protection - a critical safeguard against firmware glitches or ESD-induced spurious commands.
Can the 93C46BT-E/OT be used in automotive applications?
No, the 93C46BT-E/OT is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). Its datasheet specifies no qualification per AEC-Q100, and ERAL/WRAL functionality is only guaranteed at VCC ≥ 4.5 V - a constraint that limits robustness in automotive battery-voltage transients. Use 93C46CT-E/OT for automotive-grade variants.
93C46BT-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- 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:
- SOT-23-6
93C46BT-E/OT FAQ
1.How can I place an order for 93C46BT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BT-E/OT 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/OT reliable?
The price and inventory of 93C46BT-E/OT 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/OT is usually 5 days.
3.What payment methods are accepted for 93C46BT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BT-E/OT?
93C46BT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BT-E/OT 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/OT?
For technical support, including 93C46BT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BT-E/OT requirements.
6.How does Aetrix verify that 93C46BT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93C46BT-E/OT 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/OT meets industry standards.
7.What is the process for return or replacement of 93C46BT-E/OT?
All 93C46BT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BT-E/OT, 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/OT part is unused and in its original packaging.
Return procedure for 93C46BT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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