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Microchip Technology 93LC56A-E/MS
- Part No.:
- 93LC56A-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56A-E/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,905
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Product details
Overview
The 93LC56A-E/MS from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for automotive temperature range (–40°C to +125°C), and housed in an 8-lead MSOP package. 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 for nonvolatile configuration storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC56A-E/MS datasheet, 93LC56A-E/MS pinout, 93LC56A-E/MS application, or 93LC56A-E/MS equivalent, key selection criteria include VCC range (2.5–5.5 V), automotive-grade temperature support, 256 × 8-bit fixed organization, 1 million endurance cycles, and compatibility with Microwire protocol timing constraints including TWC = 6 ms write cycle time.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO pins with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions with dedicated timing requirements per voltage grade.
Memory architecture uses CMOS floating-gate technology enabling 200-year data retention and 1M erase/write cycles. Internal logic enforces power-on write protection and requires explicit EWEN before programming; DO pin serves dual role as serial data output and Ready/Busy indicator during erase/write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit organization; no ORG pin - fixed x8 mode) |
| VCC Range | 2.5 V to 5.5 V - supports wide automotive supply rails including 3.3 V and 5 V systems |
| Temperature Range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain applications |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or fault-log updates in vehicle ECUs |
| Data Retention | Greater than 200 years at +85°C - ensures long-term reliability without refresh in safety-critical systems |
| Write Cycle Time | 6 ms typical (TWC) - defines minimum interval between successive write commands |
| Interface Protocol | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware |
Pinout & Package
Package: 8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, Pb-free Matte Tin finish, exposed pad optional (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge for 93LC56A |
| CLK | Serial Clock | Synchronizes all data transfers; rising-edge sampling of DI and DO; stoppable mid-sequence without corruption |
| DI | Data Input | Accepts start bit, opcodes, 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 return path for all signals and internal circuitry; connects to system ground plane |
| NC | No Connection | Pin 7 in MSOP package - internally unconnected; must be left floating or tied to ground per layout best practice |
| VCC | Power Supply | Primary supply input; internal POR circuit triggers at ~1.5 V; must be ≥4.5 V for ERAL/WRAL operation |
| ORG | Organization Select | Not present on 93LC56A - permanently configured for 8-bit mode; pin 6 is NC in this variant |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - internal state machine manages auto-erase and programming phases |
| Automatic ERAL before WRAL | Guarantees full array erasure prior to bulk write, preventing partial-data corruption during firmware update sequences |
| Power-On/Off Data Protection | Hardware-level inhibition below VCC threshold (~1.5 V) prevents inadvertent writes during brown-out or startup |
| Ready/Busy Status via DO | Enables polling-based host synchronization without dedicated interrupt lines - reduces MCU pin count and BOM cost |
| Sequential Read Mode | Allows continuous address incrementing while CS remains high - accelerates reading of multi-byte configuration blocks |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Storing trim values, fault codes, and adaptive learning parameters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8-bit or 16-bit microcontroller via Microwire bus. Use Value: Automotive-grade temperature rating and 1M endurance ensure reliable logging over 15+ year vehicle lifetime under thermal cycling stress. | Use Scenario: Holding lens calibration data, image sensor settings, and firmware patch flags in compact camera housings. IC Role / Device Role / Timing Role: Serial EEPROM providing secure, low-pin-count storage for boot-time configuration retrieval. Use Value: MSOP package footprint (3×3 mm) minimizes PCB area; 2.5 V min VCC enables direct connection to 3.3 V camera SoC I/O rails. |
| Body Control Module (BCM) | Electric Power Steering (EPS) Controller |
Use Scenario: Saving user preferences (window positions, mirror angles) and module-specific diagnostics history. IC Role / Device Role / Timing Role: Microwire EEPROM accessed during initialization and infrequent parameter updates. Use Value: 200-year data retention eliminates need for battery-backed SRAM, reducing component count and failure modes. | Use Scenario: Storing motor phase alignment offsets, torque sensor zero-point corrections, and safety-critical calibration constants. IC Role / Device Role / Timing Role: Safety-relevant nonvolatile memory requiring AEC-Q100 compliance and deterministic write timing. Use Value: 6 ms guaranteed write cycle and hardware write-protection (EWEN/EWDS) support ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-E/MS | 128 × 16-bit organization; same VCC range, temp grade, and package | Requires 16-bit MCU interface or byte-swapping logic; incompatible with existing 8-bit address/data firmware | Select only if system design mandates 16-bit word access and firmware supports x16 addressing |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, industrial temp (–40°C to +85°C) | Lacks automotive temperature rating and Microwire compatibility; requires SPI-capable host | Use where SPI is already implemented and automotive qualification is not required |
Compared with 93LC56B-E/MS, the 93LC56A-E/MS provides native 8-bit word access without address translation; compared with AT25020B-MAHL-T, it offers automotive qualification and Microwire protocol support but requires different timing and instruction set handling.
Availability
The 93LC56A-E/MS is available at Aetrix Electronics and suitable for automotive electronics, engine management systems, and ADAS modules requiring stable component supply across extended production lifecycles.
Supply support for 93LC56A-E/MS 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56A-E/MS belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, space-constrained automotive and industrial applications requiring robust nonvolatile storage with minimal interface complexity.
FAQ
What is the memory organization of the 93LC56A-E/MS?
The 93LC56A-E/MS has a fixed 256 × 8-bit organization. Unlike 'C' variants, it lacks an ORG pin and is permanently configured for 8-bit word access. This eliminates external configuration logic and simplifies firmware implementation for byte-oriented data storage in the 93LC56A-E/MS.
Does the 93LC56A-E/MS require an external pull-up resistor on the DO pin?
No external pull-up is required on the DO pin of the 93LC56A-E/MS. The device drives DO actively during READ and Ready/Busy polling. However, a series resistor (e.g., 10 kΩ) is recommended between DI and DO if they share a bidirectional bus to prevent bus conflict during dummy-zero transmission in read operations.
What is the minimum VCC required for ERAL or WRAL operations on the 93LC56A-E/MS?
The 93LC56A-E/MS requires VCC ≥ 4.5 V to execute ERAL (Erase All) or WRAL (Write All) commands. Below this threshold, these instructions will not initiate, protecting against incomplete or corrupted bulk operations - a critical safeguard in automotive power-supply environments where voltage transients occur.
How does the 93LC56A-E/MS handle power loss during a write cycle?
The 93LC56A-E/MS incorporates power-on/off data protection circuitry that inhibits all programming functions when VCC drops below ~1.5 V. If power fails mid-write, the internal state machine aborts the cycle and retains pre-write data integrity - ensuring the 93LC56A-E/MS never leaves memory in a partially written or undefined state.
Is the 93LC56A-E/MS RoHS compliant and lead-free?
Yes, the 93LC56A-E/MS is Pb-free and RoHS compliant, featuring a Matte Tin (Sn) finish on all leads. This meets global environmental regulations and supports lead-free reflow soldering profiles, making it suitable for modern automotive and industrial assembly processes without requiring exemption waivers.
93LC56A-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- 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-MSOP
93LC56A-E/MS FAQ
1.How can I place an order for 93LC56A-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56A-E/MS 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 93LC56A-E/MS reliable?
The price and inventory of 93LC56A-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56A-E/MS is usually 5 days.
3.What payment methods are accepted for 93LC56A-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56A-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56A-E/MS?
93LC56A-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56A-E/MS 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 93LC56A-E/MS?
For technical support, including 93LC56A-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56A-E/MS requirements.
6.How does Aetrix verify that 93LC56A-E/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56A-E/MS 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 93LC56A-E/MS meets industry standards.
7.What is the process for return or replacement of 93LC56A-E/MS?
All 93LC56A-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56A-E/MS, 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 93LC56A-E/MS part is unused and in its original packaging.
Return procedure for 93LC56A-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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