Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 93LC56B-E/MS

Name: 93LC56B-E/MS
Brand: Microchip Technology
SKU: 93LC56B-E/MS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 93LC56B-E/MS

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: 93LC56B-E/MS.pdf

Description:: IC EEPROM 2KBIT MICROWIRE 8MSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:851

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

93LC56B-E/MS from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating across 2.5–5.5 V supply and rated for automotive temperature range (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and 1,000,000 endurance cycles - deployed in engine control units, ABS modules, and automotive sensor calibration storage.

For engineers reviewing the 93LC56B-E/MS datasheet, 93LC56B-E/MS pinout, 93LC56B-E/MS application, or 93LC56B-E/MS equivalent, key selection criteria include its dedicated 16-bit organization (no ORG pin), MSOP-8 package compatibility, automotive-grade reliability, and support for sequential read and auto-erase during write operations.

Technical Context

The 93LC56B-E/MS implements a synchronous serial Microwire protocol with CS, CLK, DI, and DO signals - no ORG pin required, fixed at 128 × 16-bit memory mapping. Communication requires a start bit followed by opcode, address, and data on rising CLK edges; DO outputs data or Ready/Busy status depending on CS timing and operation phase.

It uses internal power-on reset and voltage detect circuitry (V_POR = 1.5 V typical) to inhibit all operations below safe V_CC, and supports EWEN/EWDS commands for secure write enable/disable control. Standby current is ≤5 µA over automotive temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	2 Kbit (128 words × 16 bits) - fixed x16 organization, no ORG pin dependency
V_CC range	2.5 V to 5.5 V - supports wide automotive rail tolerance and brown-out resilience
Endurance	1,000,000 erase/write cycles - validated at 25°C, V_CC = 5.0 V per characterization
Data retention	>200 years - guaranteed nonvolatile storage under automotive thermal stress
Write cycle time	6 ms max (T_WC) - self-timed auto-erase-and-write, no external timing control needed
Operating temp	−40°C to +125°C (Automotive E grade) - qualified per AEC-Q100 stress requirements
Interface	3-wire Microwire-compatible (CS/CLK/DI/DO) - no I²C or SPI protocol overhead

Pinout & Package

8-pin MSOP (150-mil) package with exposed pad (optional V_SS connection), RoHS-compliant matte tin finish. Pin 1 marked by laser dot; pin 1 ID corner defined per JEDEC MO-187.

Pin/Terminal	Circuit Role	Design Meaning
1 (CS)	Chip Select	Active-high enable; must be held ≥250 ns low between instructions; deselects device into standby mode
2 (CLK)	Serial Clock	Synchronizes all data transfers on rising edge; clock can pause mid-sequence without state loss
3 (DI)	Data Input	Accepts start bit, opcode, address, and write data; high-impedance when not selected
4 (DO)	Data Output / Status	Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge
5 (V_SS)	Ground	Reference for all logic and analog functions; connects to exposed pad in MSOP
6 (NC)	No Connect	Internally unconnected; must be left floating or tied to V_SS per layout best practice
7 (V_CC)	Power Supply	Supplies core logic and memory array; includes internal POR detection at ~1.5 V
8 (ORG/NC)	Organization Select / NC	No internal connection on 93LC56B - pin is NC; not used for configuration

Key Features

Feature	Design Value
Self-timed erase/write	Eliminates need for external timing control or polling delays beyond T_WC = 6 ms max
Auto-ERAL before WRAL	Ensures full-array readiness prior to bulk write, preventing partial-program corruption
Ready/Busy status on DO	Enables real-time firmware monitoring without additional GPIO or interrupt lines
Power-on/off data protection	Hardware-level V_CC monitor blocks writes below 1.5 V, preventing bit corruption during brownout
EWEN/EWDS security lock	Prevents accidental writes via explicit enable command; powers up in disabled (EWDS) state

Applications

Engine Control Unit (ECU) Calibration Storage	Anti-lock Braking System (ABS) Fault Log
Use Scenario: Storing adaptive fuel trim values, ignition timing maps, and OBD-II diagnostic codes that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with deterministic 6 ms write latency and guaranteed 200-year retention under under-hood thermal cycling. Use Value: Enables field-upgradable calibration without external backup power or supercapacitors.	Use Scenario: Recording wheel speed sensor faults, hydraulic pressure anomalies, and brake actuator error counters during vehicle operation. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfacing directly with ABS MCU via Microwire, supporting sequential read of fault history. Use Value: Meets ISO 26262 ASIL-B data integrity requirements via built-in write-protection and voltage-monitoring logic.
Body Control Module (BCM) Configuration	Instrument Cluster Display Settings
Use Scenario: Holding user-configurable lighting profiles, door lock behavior, and window auto-up/down thresholds. IC Role / Device Role / Timing Role: Low-power (≤5 µA standby) serial EEPROM accessed during BCM wake-up events. Use Value: Reduces system BOM count by eliminating discrete voltage supervisors or backup batteries.	Use Scenario: Saving odometer mileage, trip counter values, and display brightness preferences across power cycles. IC Role / Device Role / Timing Role: 16-bit word-aligned storage accessed during cluster boot sequence using fixed x16 addressing. Use Value: Eliminates software bit-packing overhead and improves firmware read efficiency vs. 8-bit EEPROMs.

Engine Control Unit (ECU) Calibration Storage

Anti-lock Braking System (ABS) Fault Log

Use Scenario: Storing adaptive fuel trim values, ignition timing maps, and OBD-II diagnostic codes that persist across ignition cycles.

IC Role / Device Role / Timing Role: Nonvolatile parameter storage with deterministic 6 ms write latency and guaranteed 200-year retention under under-hood thermal cycling.

Use Value: Enables field-upgradable calibration without external backup power or supercapacitors.

Use Scenario: Recording wheel speed sensor faults, hydraulic pressure anomalies, and brake actuator error counters during vehicle operation.

IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfacing directly with ABS MCU via Microwire, supporting sequential read of fault history.

Use Value: Meets ISO 26262 ASIL-B data integrity requirements via built-in write-protection and voltage-monitoring logic.

Body Control Module (BCM) Configuration

Instrument Cluster Display Settings

Use Scenario: Holding user-configurable lighting profiles, door lock behavior, and window auto-up/down thresholds.

IC Role / Device Role / Timing Role: Low-power (≤5 µA standby) serial EEPROM accessed during BCM wake-up events.

Use Value: Reduces system BOM count by eliminating discrete voltage supervisors or backup batteries.

Use Scenario: Saving odometer mileage, trip counter values, and display brightness preferences across power cycles.

IC Role / Device Role / Timing Role: 16-bit word-aligned storage accessed during cluster boot sequence using fixed x16 addressing.

Use Value: Eliminates software bit-packing overhead and improves firmware read efficiency vs. 8-bit EEPROMs.

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/MS	Industrial grade (−40°C to +85°C); identical 128×16-bit organization, same MSOP-8 package	Not qualified for automotive under-hood environments; lacks AEC-Q100 validation	Select only for non-automotive industrial control or consumer applications requiring same footprint
AT25128B-MAHL-T	SPI interface (4-wire), 128 Kbit capacity, 1.8–5.5 V operation, SO8 package	Higher density but incompatible protocol; requires MCU SPI peripheral and driver rewrite	Choose only if migrating to SPI architecture and needing >2 Kbit storage; not drop-in compatible

Compared with 93LC56BT-I/MS, the 93LC56B-E/MS adds automotive qualification and extended temperature margin; compared with AT25128B-MAHL-T, it retains Microwire compatibility and lower pin count but trades off density and voltage flexibility.

Availability

93LC56B-E/MS is available at Aetrix Electronics and suitable for automotive control units, safety-critical sensor systems, and body electronics requiring stable component supply with long-term lifecycle assurance.

Supply support for 93LC56B-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 93LC56B-E/MS belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count automotive and industrial applications requiring robust nonvolatile storage with minimal MCU resource usage.

FAQ

What is the memory organization of the 93LC56B-E/MS?

The 93LC56B-E/MS has a fixed 128 × 16-bit (2 Kbit) organization with no ORG pin - unlike 'C' variants, it does not support runtime word-size switching. This simplifies hardware design by eliminating external ORG pull-up/pull-down logic and guarantees deterministic 16-bit data alignment for MCU firmware.

Does the 93LC56B-E/MS require an external pull-up resistor on the DO pin?

No, the 93LC56B-E/MS does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when deselected or idle. A pull-up may cause bus contention if DI and DO are shorted; Microchip recommends a series resistor if shared-line topology is used.

What is the minimum V_CC required to initiate a write operation on the 93LC56B-E/MS?

The 93LC56B-E/MS requires V_CC ≥ 2.5 V to operate, but the internal voltage detector (V_POR ≈ 1.5 V) blocks all write/erase commands below ~2.0 V. Valid write operations require stable V_CC ≥ 2.5 V; ERAL and WRAL additionally require V_CC ≥ 4.5 V per datasheet Section 2.5 and 2.9.

Can the 93LC56B-E/MS be used in a shared DI/DO bus configuration?

Yes, but with caution: Microchip warns of potential "bus conflict" during the dummy zero preceding read if A0 = high, causing undefined DO voltage. To mitigate, place a 1–10 kΩ resistor between DI and DO. For robust designs, separate DI/DO lines are preferred to avoid signal integrity issues and simplify timing validation.

Is the 93LC56B-E/MS pin-compatible with the 93LC56A-E/MS?

Yes - both use identical MSOP-8 packaging and share identical pinout (CS/CLK/DI/DO/V_SS/NC/V_CC/NC). However, the 93LC56A-E/MS is 256 × 8-bit (x8), while the 93LC56B-E/MS is 128 × 16-bit (x16); firmware must adjust address width, data width, and instruction timing accordingly. No PCB change is needed, but software adaptation is mandatory.

93LC56B-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:: 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-MSOP

93LC56B-E/MS FAQ

1.How can I place an order for 93LC56B-E/MS through Aetrix?

Please submit a Request for Quotation (RFQ) for 93LC56B-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 93LC56B-E/MS reliable?

The price and inventory of 93LC56B-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 93LC56B-E/MS is usually 5 days.

3.What payment methods are accepted for 93LC56B-E/MS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B-E/MS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 93LC56B-E/MS?

93LC56B-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 93LC56B-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 93LC56B-E/MS?

For technical support, including 93LC56B-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B-E/MS requirements.

6.How does Aetrix verify that 93LC56B-E/MS is sourced from the original manufacturer or authorized distributors?

All 93LC56B-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 93LC56B-E/MS meets industry standards.

7.What is the process for return or replacement of 93LC56B-E/MS?

All 93LC56B-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B-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 93LC56B-E/MS part is unused and in its original packaging.

Return procedure for 93LC56B-E/MS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…