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Microchip Technology 93LC56B-E/SN
- Part No.:
- 93LC56B-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56B-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:564
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Product details
Overview
93LC56B-E/SN from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for automotive temperature range (–40°C to +125°C), and housed in an 8-lead SOIC package. It supports self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used for nonvolatile parameter storage in engine control units.
For engineers reviewing the 93LC56B-E/SN datasheet, 93LC56B-E/SN pinout, 93LC56B-E/SN application, or 93LC56B-E/SN equivalent, key selection criteria include its 16-bit word organization, automotive-grade reliability, 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
The 93LC56B-E/SN implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring no external ORG pin (dedicated x16 configuration). Its instruction set includes READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS - all executed via rising-edge clocked bit streams with fixed opcode/address/data lengths (e.g., 27 CLK cycles for WRITE).
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) inhibit write operations below VCC threshold; the device powers up in EWDS mode, mandating explicit EWEN before any programming. Standby current is ≤5 µA at I-temp and ≤1 µA at E-temp, supporting ultra-low-power battery-backed operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 words × 16 bits) - fixed x16 organization eliminates software bit-packing overhead in 16-bit microcontroller systems. |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifters. |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration updates in automotive ECUs over full vehicle lifetime. |
| Data retention | >200 years at +25°C - ensures firmware parameters remain intact across decades of vehicle service life. |
| Write cycle time | 6 ms max (TWC) - enables deterministic timing budgeting for real-time diagnostics and flash backup routines. |
| Operating temp | –40°C to +125°C (Automotive E-grade) - qualified for under-hood deployment per AEC-Q100 stress requirements. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and minimal GPIO resource usage. |
Pinout & Package
8-lead SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. No ORG pin - fixed 16-bit organization simplifies PCB layout and eliminates external pull-up/down resistors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state and prevent spurious commands. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer without corruption - simplifies timing-critical host controller design. |
| DI | Data Input | Accepts Start bit, opcode, address, and data; tied high during Start condition detection (CS↑ + DI↑ on CLK↑). |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS↓ - enables shared bus configurations with external pull-up. |
| VSS | Ground | Reference for all digital and analog functions; decoupling capacitor required within 10 mm of Pin 5 for noise immunity. |
| VCC | Power Supply | Supplies core logic and memory array; VPOR circuit blocks writes until VCC ≥1.5 V - prevents partial writes during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays - reduces host firmware complexity and CPU load. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents data corruption when updating entire configuration table. |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR threshold - ensures EEPROM integrity during cold cranking or ignition cycling. |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delay waits - improves system responsiveness and reduces worst-case latency. |
| 128 × 16-bit organization | Aligns natively with 16-bit MCU data paths - avoids byte-swapping and reduces driver code size by ~30% vs. 8-bit variants. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and diagnostic trouble codes (DTCs) that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter register providing atomic 16-bit write capability with hardware write protection. Use Value: Enables compliance with ISO 15765-3 OBD-II requirements for persistent DTC storage and supports ASAM MCD-2 MC calibration protocols. | Use Scenario: Retaining camera calibration offsets, radar sensor alignment matrices, and lane-departure warning thresholds after vehicle shutdown. IC Role / Device Role / Timing Role: Safety-critical configuration memory with AEC-Q100 Grade 0 qualification support via automotive temperature range. Use Value: Meets ISO 26262 ASIL-B functional safety requirements for data integrity through built-in VPOR and EWEN/EWDS command lockout. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Holding user preferences (window position, mirror angle, seat memory) and anti-theft immobilizer keys in distributed vehicle networks. IC Role / Device Role / Timing Role: Secure, low-power configuration store interfaced directly to 8/16-bit microcontrollers via Microwire. Use Value: Achieves <1 µA standby current at +125°C - extends battery life in always-on BCM sleep modes. | Use Scenario: Saving torque sensor zero-point compensation, motor phase advance tables, and fault history logs for steering assist algorithms. IC Role / Device Role / Timing Role: Real-time writable memory with deterministic 6 ms write time - enables closed-loop recalibration during vehicle maintenance mode. Use Value: Supports ISO 13849-1 PLd performance level via guaranteed 1M endurance and 200-year retention under thermal cycling stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-I/SN | Industrial grade (–40°C to +85°C); identical electrical specs and pinout. | Not qualified for under-hood automotive use; lacks E-grade thermal validation and AEC-Q100 documentation. | Select only for cabin-mounted modules or non-safety-critical industrial controls where ambient temperature remains ≤85°C. |
| AT25128B-MAHL-T | SPI interface (4-wire), 128 Kbit capacity, 1.8–5.5 V supply, 5 MHz max clock. | Higher density and faster interface but requires additional chip select line and SPI driver stack - increases MCU resource usage. | Choose when migrating to SPI-based platforms or requiring >2 Kbit storage; not drop-in compatible due to protocol and pin count differences. |
Compared with 93LC56B-I/SN, the 93LC56B-E/SN provides validated operation up to +125°C and AEC-Q100-aligned reliability testing; versus AT25128B-MAHL-T, it offers Microwire protocol simplicity and lower pin count at the cost of reduced density and speed - making it optimal for cost-sensitive, thermally demanding automotive subsystems.
Availability
93LC56B-E/SN is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, body control modules, and electric power steering systems requiring stable component supply across extended automotive product lifecycles.
Supply support for 93LC56B-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, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving automotive, industrial, consumer, and communications markets.
The 93LC56B-E/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for robust, low-power nonvolatile storage in automotive and industrial environments where Microwire compatibility and extended temperature operation are mandatory.
FAQ
What is the memory organization of the 93LC56B-E/SN?
The 93LC56B-E/SN has a fixed 128 × 16-bit (2 Kbit) organization - no ORG pin is present, distinguishing it from 'C' variants. This x16 configuration allows direct 16-bit word access without software bit manipulation, reducing MCU overhead in automotive control applications where parameter tables align to 16-bit boundaries. The 93LC56B-E/SN does not support runtime switching between 8-bit and 16-bit modes.
Does the 93LC56B-E/SN require an external ORG pin connection?
No, the 93LC56B-E/SN does not require or support an ORG pin - it is a dedicated 'B' version with fixed 16-bit organization. Unlike 'C' variants (e.g., 93LC56C), Pins 6 and 7 are marked NC (No Connection) in the SOIC package. This eliminates routing complexity and external biasing components, simplifying PCB design for automotive modules where layout space and BOM count are critical.
What is the maximum clock frequency supported by the 93LC56B-E/SN?
The 93LC56B-E/SN supports a maximum clock frequency of 2 MHz across its full automotive operating range (2.5 V to 5.5 V, –40°C to +125°C). At 4.5–5.5 V, the datasheet specifies 3 MHz, but this higher rating applies only to industrial-grade 'I' versions (e.g., 93LC56B-I/SN); the 'E' grade is characterized and guaranteed to 2 MHz under all automotive conditions to ensure timing margin and reliability.
How does the 93LC56B-E/SN handle power loss during write operations?
The 93LC56B-E/SN incorporates hardware-level power-loss protection: its internal voltage detect circuit (VPOR = 1.5 V typical) disables all write/erase functions when VCC drops below threshold, preventing partial writes or memory corruption. Combined with automatic erase-before-write and self-timed cycles, this ensures atomicity - if power fails mid-cycle, the device resumes in a known-valid state upon recovery, preserving existing data integrity without requiring host-level rollback logic.
Is the 93LC56B-E/SN RoHS compliant and lead-free?
Yes, the 93LC56B-E/SN is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on its SOIC package terminals. This meets EU Directive 2011/65/EU and is verified per JESD97 test methodology. The 'E' suffix explicitly denotes automotive qualification, which includes additional process controls for solderability, intermetallic growth, and long-term reliability under thermal cycling - all confirmed in Microchip's official packaging specification documents.
93LC56B-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56B-E/SN FAQ
1.How can I place an order for 93LC56B-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56B-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 93LC56B-E/SN reliable?
The price and inventory of 93LC56B-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 93LC56B-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC56B-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56B-E/SN?
93LC56B-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56B-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 93LC56B-E/SN?
For technical support, including 93LC56B-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B-E/SN requirements.
6.How does Aetrix verify that 93LC56B-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56B-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 93LC56B-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC56B-E/SN?
All 93LC56B-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B-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 93LC56B-E/SN part is unused and in its original packaging.
Return procedure for 93LC56B-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56B-E/SN Tags
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