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Microchip Technology 93C56BT-I/OT
- Part No.:
- 93C56BT-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93C56BT-I/OT.pdf
- Description:
- IC EEPROM 2KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
93C56BT-I/OT from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded microcontroller parameter storage for HVAC controllers.
For engineers reviewing the 93C56BT-I/OT datasheet, 93C56BT-I/OT pinout, 93C56BT-I/OT application, or 93C56BT-I/OT equivalent, this page delivers verified electrical specs, package-confirmed pin functions, real-world use cases, and two validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The 93C56BT-I/OT implements a synchronous serial Microwire protocol with CS, CLK, DI, and DO signals. Its fixed 8-bit organization eliminates ORG pin dependency (pin 6 is NC), enabling deterministic address/data framing without external configuration logic. All instructions - READ, WRITE, ERASE, ERAL, WRAL - are initiated by a Start bit followed by opcode and address on rising CLK edges.
It uses internal auto-erase-before-write architecture with 2 ms typical program cycle time (TWC) at 4.5–5.5 V. The DO pin serves dual function: serial data output during READ and active-low Ready/Busy indicator during programming - requiring CS high ≥250 ns after TCSL to sample status reliably.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - supports up to 256 bytes of nonvolatile configuration data |
| VCC range | 4.5 V to 5.5 V - compatible with standard 5 V logic systems; no operation below 3.8 V (VPOR) |
| Clock frequency | Up to 3 MHz - enables fast serial access; timing valid only within specified VCC range |
| Write endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable firmware storage |
| Data retention | 200 years at 25°C - guarantees data integrity across product lifecycle without refresh |
| Operating temp | –40°C to +85°C (Industrial grade) - qualified for use in industrial control and automotive body electronics |
| Interface | 3-wire Microwire-compatible (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode or SS pin required |
Pinout & Package
93C56BT-I/OT is packaged in 6-lead SOT-23 (package code OT), with pin 1 marked by laser dot. Pin 6 is NC (no internal connection); ORG functionality is absent - confirming fixed 8-bit organization per device family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Indicator | Serial data output during READ; active-low status signal during erase/write - requires CS high ≥250 ns to sample |
| 2 (VSS) | Ground Reference | Primary return path for all internal circuitry; must be low-impedance connection to system GND plane |
| 3 (DI) | Data Input | Serial input for Start bit, opcodes, addresses, and write data - sampled on rising CLK edge |
| 4 (VCC) | Power Supply | 4.5–5.5 V supply; internal POR activates at ~3.8 V - prevents spurious writes during brown-out |
| 5 (CS) | Chip Select | Active-high enable; must remain low ≥250 ns (TCSL) between commands to reset internal state |
| 6 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in bits; clock may pause mid-sequence without error |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - 2 ms typical TWC allows predictable firmware update latency |
| Auto-ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial-program corruption in calibration data storage |
| Power-on/off data protection | Hardware-enforced write inhibit below 3.8 V - prevents EEPROM corruption during power ramp-up/down |
| Ready/Busy status on DO | Enables polling-based host synchronization without dedicated interrupt line - reduces MCU pin count |
| 100 µA max standby current | Supports battery-backed applications - extends shelf life and runtime in low-power sensor nodes |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and user-defined logic parameters in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via MCU's GPIO bit-banged Microwire interface during boot or maintenance mode. Use Value: Enables field reconfiguration without firmware reflashing; 200-year data retention ensures parameter persistence over equipment lifetime. |
Use Scenario: Holding door lock actuator profiles, mirror position presets, and lighting dimming curves in automotive BCMs. IC Role / Device Role / Timing Role: Dedicated 5 V EEPROM interfaced to 8-bit MCU with strict AEC-Q100-compliant timing margins. Use Value: Industrial-grade temp range (–40°C to +85°C) and 1M-cycle endurance support repeated dealership reprogramming. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing flow-rate calibration coefficients, alarm thresholds, and usage logs in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory accessed during startup and periodic self-test sequences. Use Value: Hardware write-protection (EWDS/EWEN) and VPOR threshold prevent accidental overwrite during power transients. |
Use Scenario: Retaining tariff schedules, metering constants, and communication keys in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage element isolated from main processor bus. Use Value: Pb-free RoHS compliance and 25-year field validation history meet utility-grade certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-I/OT | 2.5–5.5 V VCC range; same 256 × 8-bit organization and SOT-23 package | Broader supply compatibility enables use in mixed-voltage 3.3 V/5 V systems where 93C56BT-I/OT cannot operate below 4.5 V | Select when system VCC varies or includes 3.3 V rails; verify timing margins at lower voltage |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V, 20 MHz max clock; different command set and no Ready/Busy pin | Requires SPI peripheral instead of bit-banged Microwire; lacks DO-based polling - needs software timeout handling | Choose for higher throughput or existing SPI infrastructure; accept added firmware complexity for status management |
Compared with 93LC56BT-I/OT, the 93C56BT-I/OT offers tighter VCC tolerance and proven robustness in 5 V industrial environments, while AT25020B-MAHL-T trades interface simplicity for speed and voltage flexibility - making each suitable for distinct system architecture constraints.
Availability
93C56BT-I/OT is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive BCM parameter retention, medical infusion pump calibration, and smart energy meter firmware parameters requiring stable component supply across multi-year production cycles.
Supply support for 93C56BT-I/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 MCU resource overhead - emphasizing ease of integration, long-term data integrity, and industrial environmental resilience.
FAQ
What is the memory organization of the 93C56BT-I/OT?
The 93C56BT-I/OT has a fixed 256 × 8-bit (2 Kbit) organization. Unlike 'C'-suffix variants, it lacks an ORG pin (pin 6 is NC), confirming dedicated 8-bit operation without external configuration. This simplifies PCB layout and firmware driver design by eliminating mode-setting logic.
Does the 93C56BT-I/OT support 3.3 V operation?
No, the 93C56BT-I/OT requires 4.5–5.5 V supply and will not function below 3.8 V (VPOR threshold). For 3.3 V systems, consider the 93LC56BT-I/OT (2.5–5.5 V) or 93AA56BT-I/OT (1.8–5.5 V), both sharing identical SOT-23 packaging and instruction set.
How is Ready/Busy status monitored on the 93C56BT-I/OT?
During erase or write operations, the DO pin outputs active-low Ready/Busy status. To read it, bring CS high for ≥250 ns after TCSL (minimum CS low time), then sample DO: low = busy, high = ready. After completion, issue a Start bit and pull CS low to clear the status flag.
What is the purpose of the EWEN and EWDS commands in the 93C56BT-I/OT?
The 93C56BT-I/OT powers up in EWDS (Erase/Write Disable) mode. EWEN must be issued before any ERASE or WRITE command; EWDS restores protection afterward. These commands prevent accidental overwrites during noise events or power glitches - critical for field-deployed systems.
Is the 93C56BT-I/OT RoHS compliant and lead-free?
Yes, the 93C56BT-I/OT is Pb-free and RoHS compliant per Microchip DS21794G documentation. The SOT-23 package uses Matte Tin (Sn) finish, and marking includes "e3" JEDEC designation on reel labels per Microchip's packaging specification.
93C56BT-I/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:
- 2Kbit
- Memory Organization:
- 128 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:
- SOT-23-6
93C56BT-I/OT FAQ
1.How can I place an order for 93C56BT-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56BT-I/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 93C56BT-I/OT reliable?
The price and inventory of 93C56BT-I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56BT-I/OT is usually 5 days.
3.What payment methods are accepted for 93C56BT-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56BT-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56BT-I/OT?
93C56BT-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56BT-I/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 93C56BT-I/OT?
For technical support, including 93C56BT-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56BT-I/OT requirements.
6.How does Aetrix verify that 93C56BT-I/OT is sourced from the original manufacturer or authorized distributors?
All 93C56BT-I/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 93C56BT-I/OT meets industry standards.
7.What is the process for return or replacement of 93C56BT-I/OT?
All 93C56BT-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93C56BT-I/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 93C56BT-I/OT part is unused and in its original packaging.
Return procedure for 93C56BT-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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