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Microchip Technology 93LC56BT/SN
- Part No.:
- 93LC56BT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56BT/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
93LC56BT/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature grade (−40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin. Used for configuration storage in embedded controllers, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 93LC56BT/SN datasheet, 93LC56BT/SN pinout, 93LC56BT/SN application, or 93LC56BT/SN equivalent, this page delivers verified electrical specs, package mapping to SOIC-8 (SN), functional timing behavior, real-world use scenarios, and two validated alternative parts with documented technical and application differences.
Technical Context
The 93LC56BT/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin (A-version), fixed 8-bit word organization. It uses CMOS EEPROM technology with on-chip charge pump for write/erase, requiring no external high-voltage supply. All operations are initiated by clocked instruction sequences starting with a Start bit (CS=1, DI=1 at CLK rising edge).
Write and erase cycles are fully self-timed: falling edge of CS triggers auto-erase-and-write for 93LC56A/B devices, with typical TWC = 6 ms. Power-on/off protection activates below 1.5 V, and EWEN/EWDS commands enforce explicit write-enable control - device powers up in EWDS state, blocking all programming until EWEN is issued.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - supports 256 bytes of nonvolatile configuration or calibration data |
| 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 SPI mode bits required |
| Endurance | 1,000,000 erase/write cycles - suitable for field-updatable parameters with frequent rewrites |
| Data retention | Greater than 200 years at 25°C - ensures long-term reliability in unpowered storage |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - enables fast bulk reads (20 clocks per byte) in high-throughput systems |
| Operating temp | −40°C to +85°C (Industrial grade) - qualified for industrial automation, metering, and automotive body electronics |
Pinout & Package
8-pin SOIC package (SN suffix), Pb-free Matte Tin finish, standard 150-mil width. Pin 1 marked by laser dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable: must be held high ≥250 ns between instructions; deselects device into standby when low |
| 2 CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 DI | Data Input | Accepts Start bit, instruction opcodes, address bits, and write data; must be stable before CLK rising edge |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or during non-read states |
| 5 VSS | Ground | Reference return path for all I/O and internal circuitry; requires low-impedance connection to system GND |
| 6 NC | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice (no drive capability) |
| 7 NC | No Connection | Same as Pin 6 - unused terminal; no internal bond wire; avoid routing signals nearby |
| 8 VCC | Power Supply | 2.5–5.5 V supply input; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (6 ms max); simplifies firmware driver design |
| Automatic ERAL before WRAL | Guarantees full array erase prior to Write All - prevents partial writes and data corruption during bulk updates |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC threshold prevents spurious writes during brown-out or power ramp conditions |
| Ready/Busy status on DO | Enables efficient polling without dedicated status register access - reduces bus overhead and interrupt latency |
| EWEN/EWDS command security | Requires explicit Erase/Write Enable before any programming, preventing accidental overwrites during normal operation |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in smart pressure sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at power-up and during field recalibration; sequential read used for fast coefficient loading. Use Value: Enables single-device calibration across temperature ranges without external memory; 200-year retention ensures lifetime accuracy without periodic refresh. |
Use Scenario: Holding user-defined I/O mapping, communication protocol settings, and watchdog timeout values in HVAC controller PCBs. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to MCU GPIOs; accessed only during boot or menu navigation - low duty cycle, high reliability required. Use Value: Survives 1M+ power cycles and retains settings through firmware updates; 2.5 V min VCC supports battery-backed operation during main supply loss. |
| Smart Meter Firmware Parameters | Automotive Body Control Module |
|
Use Scenario: Storing tariff schedules, pulse constants, and tamper-event logs in electricity meters certified to IEC 62056. IC Role / Device Role / Timing Role: Secure, write-protected data archive; WRAL used for scheduled parameter updates; ERAL invoked before firmware upgrades. Use Value: 1M endurance supports daily log writes for >2.7 years; automatic ERAL+WRAL sequence prevents partial writes during grid instability. |
Use Scenario: Retaining seat position memory, mirror angle presets, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Low-power configuration store operating from 12 V battery via LDO; accessed only during ignition-on or key-fob wake events. Use Value: −40°C to +85°C rating matches under-hood thermal envelope; 5.5 V max VCC accommodates load-dump transients without external clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B/SN | 128 × 16-bit organization (vs. 256 × 8-bit); identical VCC range, timing, and package | Requires 16-bit MCU data path alignment; not drop-in for existing 8-bit firmware interfaces | Select only if system architecture natively supports 16-bit word access and memory map permits reduced address depth |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit capacity, 1.8–5.5 V VCC, 20 MHz max clock; no Ready/Busy pin | Requires SPI peripheral instead of GPIO-bitbanged Microwire; lacks hardware status polling - needs software timeout handling | Choose when higher throughput (20 MHz vs. 3 MHz) is critical and MCU has dedicated SPI hardware with DMA support |
Compared with 93LC56B/SN, the 93LC56BT/SN provides native 8-bit addressing and simpler firmware integration; compared with AT25020B-MAHL-T, it offers deterministic status feedback and lower pin count but trades off speed and voltage flexibility.
Availability
93LC56BT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and smart meter firmware parameter storage requiring stable component supply across multi-year production lifecycles.
Supply support for 93LC56BT/SN 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 93LC56BT/SN belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-power, nonvolatile data storage in space-constrained embedded systems using minimal GPIO resources.
FAQ
What is the memory organization and capacity of the 93LC56BT/SN?
The 93LC56BT/SN is a 2 Kbit serial EEPROM organized as 256 words × 8 bits (256 × 8). It belongs to the 'A' version of the 93LC56 family, meaning it has fixed 8-bit word size and no ORG pin. This configuration supports byte-level addressing and direct compatibility with 8-bit microcontroller data buses without packing/unpacking logic.
Does the 93LC56BT/SN require an external high-voltage supply for write operations?
No, the 93LC56BT/SN 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 self-timed and initiated solely by the falling edge of CS after instruction and data loading - no external HV circuitry or timing control is needed.
How is write protection implemented on the 93LC56BT/SN?
Write protection on the 93LC56BT/SN is implemented through dual hardware and command-based mechanisms: (1) Power-on/off detection locks writes below 1.5 V VCC, and (2) the device powers up in Erase/Write Disable (EWDS) state. An explicit EWEN command must be issued before any ERASE, WRITE, ERAL, or WRAL instruction can execute - providing deterministic, firmware-enforced write gating.
What package type does the 93LC56BT/SN use, and what does the 'SN' suffix indicate?
The 93LC56BT/SN uses an 8-pin Small Outline Integrated Circuit (SOIC) package with 150-mil width and Pb-free Matte Tin finish. The 'SN' suffix is Microchip's standardized package code for this SOIC variant, confirmed in DS21794G-page 14 packaging table and consistent across all 93XX56A/B/C devices in SOIC format.
Can the 93LC56BT/SN be used in automotive applications requiring −40°C to +125°C operation?
No, the 93LC56BT/SN is rated for Industrial temperature range only (−40°C to +85°C), as indicated by its 'I' grade marking and specification limits in DS21794G. For Automotive (E-grade, −40°C to +125°C) operation, Microchip specifies the 93LC56BT-I/SN variant - the 'T' in 93LC56BT/SN denotes tape-and-reel packaging, not temperature grade; temperature grade is encoded separately in marking (e.g., 'I' or 'E').
93LC56BT/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56BT/SN FAQ
1.How can I place an order for 93LC56BT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BT/SN 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 93LC56BT/SN reliable?
The price and inventory of 93LC56BT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56BT/SN is usually 5 days.
3.What payment methods are accepted for 93LC56BT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BT/SN?
93LC56BT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BT/SN 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 93LC56BT/SN?
For technical support, including 93LC56BT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BT/SN requirements.
6.How does Aetrix verify that 93LC56BT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56BT/SN 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 93LC56BT/SN meets industry standards.
7.What is the process for return or replacement of 93LC56BT/SN?
All 93LC56BT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BT/SN, 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 93LC56BT/SN part is unused and in its original packaging.
Return procedure for 93LC56BT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56BT/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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