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Microchip Technology 93LC56CT-E/SN
- Part No.:
- 93LC56CT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56CT-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
93LC56CT-E/SN from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with 256 × 8-bit organization, automotive-grade temperature range (−40°C to +125°C), 2.5–5.5 V supply, and Microwire-compatible 3-wire serial interface. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used for configuration storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC56CT-E/SN datasheet, 93LC56CT-E/SN pinout, 93LC56CT-E/SN application, or 93LC56CT-E/SN equivalent, key selection criteria include automotive temperature qualification, 8-bit fixed-word organization (no ORG pin), SOIC-8 package compatibility, and Microwire protocol timing compliance at VCC ≥ 2.5 V.
Technical Context
The 93LC56CT-E/SN implements a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO pins. It operates exclusively in x8 mode (ORG pin not present), eliminating external configuration logic. All instructions - READ, WRITE, ERASE, ERAL, WRAL - are initiated via rising-edge clocked opcodes and address fields, with DO providing Ready/Busy status during programming.
Its internal architecture includes an auto-erase-before-write mechanism, integrated power-on reset detection (VPOR = 1.5 V typical), and EWEN/EWDS command-based write protection. The device enters Standby mode when CS is low, drawing only 1 µA (I-temp) or 5 µA (E-temp) ICCS, and supports sequential read without reissuing addresses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), fixed x8 organization - no ORG pin required; simplifies PCB layout and firmware addressing. |
| VCC range | 2.5 V to 5.5 V - supports direct connection to 3.3 V or 5 V automotive subsystem rails without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - ensures reliable field updates over full vehicle lifetime in telematics or calibration storage. |
| Data retention | 200 years at 25°C - guarantees nonvolatile storage integrity across product lifecycle without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware. |
| Timing (FCLK) | Up to 2 MHz at VCC ≥ 2.5 V - enables fast configuration load times while maintaining noise immunity in EMI-prone environments. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood and transmission control module deployment. |
Pinout & Package
93LC56CT-E/SN is supplied in an 8-lead SOIC package (SN suffix), with lead finish Pb-free (Matte Tin). Pin 1 is marked by laser dot; package dimensions conform to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed erase/write on falling edge. |
| CLK | Serial Clock | Synchronizes all data transfers; opcodes, addresses, and data clocked on rising edge; stoppable at any point. |
| DI | Data Input | Receives Start bit, instruction opcodes, memory addresses, and write data; high-impedance when not selected. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge. |
| VSS | Ground | Reference for all I/O and internal circuitry; requires low-impedance connection to system ground plane. |
| NC | No Connection | Pin 7 is internally unconnected - must be left floating or tied to VSS per layout best practice; no routing required. |
| VCC | Power Supply | 2.5–5.5 V supply input; includes on-chip voltage detect (VPOR = 1.5 V) for automatic data protection during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - TWC = 6 ms max per operation reduces firmware overhead and interrupt latency. |
| Automatic ERAL before WRAL | Guarantees clean array state prior to bulk write - prevents partial writes and eliminates need for separate ERAL command in calibration update sequences. |
| Power-on/off data protection | Hardware-enforced lockout below VPOR = 1.5 V - prevents corruption during ignition cycling or battery disconnect events. |
| EWEN/EWDS command protection | Prevents accidental writes via explicit enable/disable - required before every erase/write; powers up in EWDS state for fail-safe default. |
| Ready/Busy polling via DO | Enables non-blocking firmware operation - DO low indicates active programming; avoids fixed delays and improves real-time responsiveness. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing trim values, fuel maps, and adaptive learning parameters subject to field updates via diagnostic port. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to 8-bit MCU via Microwire; accessed during boot and service mode. Use Value: 200-year data retention and 1M endurance ensure parameter integrity across 15+ year vehicle life without degradation. | Use Scenario: Holding door lock logic states, lighting profiles, and window position memory in distributed body electronics. IC Role / Device Role / Timing Role: Low-power serial EEPROM sharing bus with other peripherals; accessed intermittently during wake-up events. Use Value: 1 µA standby current (I-temp) and 5 µA (E-temp) minimizes parasitic drain on vehicle battery during sleep mode. |
| Tire Pressure Monitoring System (TPMS) | Advanced Driver Assistance Systems (ADAS) Camera Module |
Use Scenario: Retaining sensor calibration offsets and unique ID after battery replacement or module reprogramming. IC Role / Device Role / Timing Role: Microwire EEPROM directly connected to ASK/OOK transceiver MCU; programmed during manufacturing and service. Use Value: −40°C to +125°C operation ensures reliability inside wheel well enclosures exposed to thermal cycling and road salt. | Use Scenario: Storing lens focus calibration data, image sensor gain tables, and firmware patch flags in compact camera housings. IC Role / Device Role / Timing Role: Configuration memory mapped to MCU's serial peripheral interface; read at startup and updated during factory calibration. Use Value: SOIC-8 package (SN) enables standard pick-and-place assembly and rework compatibility with existing ADAS SMT lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-E/SN | 128 × 16-bit organization; same VCC range, temp grade, and package - but requires 16-bit firmware addressing and data handling. | Used where wider word access reduces transaction count (e.g., CAN message buffers), but incompatible with x8-only drivers. | Select only if system firmware supports 16-bit word reads/writes and memory map alignment matches 128-word depth. |
| AT25DF041A-SHN-T | 4 Mbit SPI Flash with sector erase; 2.7–3.6 V only; no built-in ERAL/WRAL; requires external erase commands and page programming. | Higher density for firmware storage; lacks auto-erase and microwire compatibility - needs SPI-capable host and driver rewrite. | Choose for larger code/data storage needs; avoid when Microwire legacy support, guaranteed 256-byte erase granularity, or automotive 2.5 V operation is required. |
Compared with 93LC56BT-E/SN, the 93LC56CT-E/SN offers simpler 8-bit firmware integration and eliminates ORG pin routing; versus AT25DF041A-SHN-T, it provides deterministic 6 ms write timing, lower VCC minimum, and native automotive qualification - critical for safety-critical configuration storage.
Availability
93LC56CT-E/SN is available at Aetrix Electronics and suitable for automotive control systems, industrial sensor nodes, and medical diagnostics equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93LC56CT-E/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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, and automotive-qualified nonvolatile memory applications requiring Microwire protocol compatibility and robust data integrity.
FAQ
What is the memory organization of the 93LC56CT-E/SN?
The 93LC56CT-E/SN has a fixed 256 × 8-bit organization. Unlike 'C'-suffix variants, it does not feature an ORG pin - confirming dedicated x8 operation. This eliminates external configuration logic and simplifies firmware development for byte-oriented data structures. The absence of ORG is consistent across all 'T'-suffixed SOIC-8 automotive-grade 93LC56A devices.
Does the 93LC56CT-E/SN support 3.3 V operation?
Yes, the 93LC56CT-E/SN fully supports 3.3 V operation within its specified VCC range of 2.5 V to 5.5 V. At 3.3 V, it delivers 2 MHz maximum clock frequency (FCLK), 100 µA typical read current (ICC read), and maintains full −40°C to +125°C automotive temperature performance - making it suitable for modern 3.3 V automotive microcontrollers without level translation.
How does write protection work on the 93LC56CT-E/SN?
Write protection on the 93LC56CT-E/SN is enforced via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands. The device powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. After programming, executing EWDS restores protection - preventing accidental overwrites during noise events or software faults. This dual-command scheme adds deterministic security beyond simple VCC-based locking.
What is the purpose of the NC pin on the 93LC56CT-E/SN?
Pin 7 of the 93LC56CT-E/SN is marked NC (No Connection) and is internally unconnected. It must be left floating or tied to VSS per Microchip's layout guidance - never driven high or used as a signal trace. This pin corresponds to the ORG function on 'C'-suffix variants but is omitted in the 'A'-suffix 93LC56A family, including the 93LC56CT-E/SN.
Can the 93LC56CT-E/SN be used in place of the 93LC56AT-E/SN?
Yes - the 93LC56CT-E/SN and 93LC56AT-E/SN are identical in functionality, electrical specifications, and pinout. The 'T' suffix denotes tape-and-reel packaging; 'A' denotes tube packaging. Both share the same 256 × 8-bit organization, automotive temperature rating, SOIC-8 (SN) package, and Microwire interface - enabling direct substitution in production without design change.
93LC56CT-E/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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56CT-E/SN FAQ
1.How can I place an order for 93LC56CT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56CT-E/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 93LC56CT-E/SN reliable?
The price and inventory of 93LC56CT-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56CT-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC56CT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56CT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56CT-E/SN?
93LC56CT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56CT-E/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 93LC56CT-E/SN?
For technical support, including 93LC56CT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56CT-E/SN requirements.
6.How does Aetrix verify that 93LC56CT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56CT-E/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 93LC56CT-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC56CT-E/SN?
All 93LC56CT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56CT-E/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 93LC56CT-E/SN part is unused and in its original packaging.
Return procedure for 93LC56CT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56CT-E/SN Tags
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