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Microchip Technology 93LC56B/SN
- Part No.:
- 93LC56B/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56B/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,328
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Product details
Overview
93LC56B/SN from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin - used in microcontroller firmware storage, sensor calibration data retention, and industrial control configuration memory.
For engineers reviewing the 93LC56B/SN datasheet, 93LC56B/SN pinout, 93LC56B/SN application, or 93LC56B/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 for design flexibility and supply continuity.
Technical Context
This device implements a synchronous serial Microwire interface with dedicated CS, CLK, DI, and DO pins - no ORG pin (fixed 16-bit organization). Communication requires start-bit detection followed by opcode, address, and data bits clocked on rising CLK edges. Read operations output 16-bit data with a preceding dummy zero; write/erase cycles are fully self-timed and initiate on CS falling edge (93LC series).
Power-on/off data protection is enforced via internal voltage detect circuitry (VPOR = 1.5 V typical), and programming is gated by EWEN/EWDS commands - device powers up in EWDS mode. Endurance is rated at 1 million erase/write cycles with >200 years data retention at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 × 16-bit organization) |
| VCC range | 2.5 V to 5.5 V - supports wide-range industrial power rails and battery-backed systems |
| Interface | 3-wire Microwire-compatible serial (CS/CLK/DI/DO) - minimal GPIO usage, no I²C pull-ups required |
| Write cycle time | 6 ms max - enables predictable firmware update latency in embedded bootloaders |
| Endurance | 1,000,000 erase/write cycles - suitable for field-updatable parameter logging |
| Data retention | >200 years at 25°C - ensures long-term calibration stability in unattended equipment |
| Temp range | −40°C to +125°C (E grade) - qualified for under-hood automotive and industrial motor drives |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, standard footprint compatible with legacy 93LCxx designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clocks needed during self-timed write |
| DI | Data Input | Accepts start bit, opcode, address, and write data; high-impedance when not selected |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference return path for all I/O and core logic; decoupling capacitor required near pin |
| NC | No Connection | Pin 7 in SOIC-8 - must remain unconnected; not internally bonded |
| VCC | Power Supply | 2.5–5.5 V supply; internal POR circuit disables writes below ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - simplifies host firmware and reduces CPU overhead during nonvolatile updates |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write - prevents partial-write corruption in configuration recovery sequences |
| Ready/Busy status on DO | Enables polling-based synchronization without interrupt lines - ideal for resource-constrained MCUs |
| EWEN/EWDS security gating | Prevents accidental writes during noise events or brown-out - requires explicit enable before each programming session |
| 128 × 16-bit fixed organization | Optimizes byte-aligned access for 16-bit microcontrollers and DSPs - avoids software bit-packing overhead |
Applications
| Industrial PLC Configuration Storage | Automotive Sensor Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during commissioning or maintenance; supports sequential reads and single-address writes. Use Value: 128 × 16-bit layout matches common 16-bit register banks; 125°C rating ensures reliability inside hot control panels; 1M-cycle endurance accommodates decades of field recalibration. | Use Scenario: Retaining temperature-compensated offset/gain coefficients for engine coolant and exhaust gas sensors across vehicle lifetime. IC Role / Device Role / Timing Role: Calibration data vault accessed once per ignition cycle during sensor initialization; erased only during dealer reprogramming. Use Value: −40°C to +125°C operation meets AEC-Q100 Grade 1 requirements; >200-year data retention eliminates drift-related recalibration needs; Microwire interface integrates cleanly with automotive MCU SPI peripherals. |
| Medical Device Parameter Backup | Smart Meter Firmware Patch Storage |
Use Scenario: Preserving user-adjustable therapy settings (e.g., infusion rate limits, alarm volumes) in portable infusion pumps after battery removal. IC Role / Device Role / Timing Role: Low-power backup memory holding critical safety-critical parameters; accessed only on power-up or menu change. Use Value: 2.5 V minimum VCC enables operation from depleted Li-ion cells; 1 µA standby current extends battery life; RoHS/Pb-free compliance satisfies medical regulatory submissions. | Use Scenario: Storing delta patches for firmware updates in utility smart meters installed in outdoor enclosures exposed to wide ambient swings. IC Role / Device Role / Timing Role: Field-upgradable code segment repository; written once per OTA update, read during boot verification. Use Value: 6 ms write time enables fast patch application; 125°C rating survives summer rooftop temperatures; SOIC-8 (SN) package supports automated optical inspection in high-volume meter assembly. |
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/SN | Same die, identical 128×16-bit organization and timing; differs only in temperature grade marking (I vs E) | Rated for −40°C to +85°C only - unsuitable for under-hood or high-ambient industrial use | Select only if system ambient stays ≤85°C and cost sensitivity outweighs future thermal margin needs |
| AT25020B-MAHL-T | 2 Kbit SPI EEPROM (256×8), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling | Requires SPI master with flag-checking logic; lacks dedicated DO status signal for simple polling | Choose when migrating to higher-speed SPI infrastructure and existing firmware already handles WIP polling |
Compared with 93LC56B/SN, the 93LC56BT-I/SN offers identical functionality at lower temperature grade, while AT25020B-MAHL-T provides faster SPI throughput but removes hardware-ready signaling - impacting real-time determinism in safety-critical boot paths.
Availability
93LC56B/SN is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive sensor calibration memory, and medical device parameter backup requiring stable component supply across extended product lifecycles.
Supply support for 93LC56B/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 93LCxx family was designed specifically for cost-sensitive, low-power embedded systems needing reliable serial EEPROM with Microwire compatibility, robust data retention, and extended temperature operation - targeting automotive, industrial, and medical end equipment.
FAQ
What is the memory organization of the 93LC56B/SN?
The 93LC56B/SN has a fixed 128 × 16-bit organization - meaning it stores 128 words of 16 bits each (2 Kbit total). Unlike 'C' variants, it lacks an ORG pin and does not support runtime word-size selection. This configuration is optimized for 16-bit microcontrollers and avoids software bit manipulation during read/write operations.
Does the 93LC56B/SN require an external pull-up resistor on the DO pin?
No, the 93LC56B/SN does not require an external pull-up on DO. The pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when deselected (CS low) or idle. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during the dummy-zero phase of read operations.
What is the maximum clock frequency supported by the 93LC56B/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC56B/SN supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) for 2.5 V ≤ VCC < 5.5 V. Exceeding this limit may cause setup/hold violations and unreliable communication, especially at temperature extremes.
How does the 93LC56B/SN handle power loss during a write cycle?
The 93LC56B/SN incorporates power-on/off data protection: its internal voltage detector disables all write/erase operations when VCC falls below ~1.5 V. If power drops mid-write, the self-timed cycle aborts safely and leaves memory contents unchanged - no partial writes or corruption occurs. A subsequent valid write requires re-execution of EWEN.
Is the 93LC56B/SN pin-compatible with the 93LC56A/SN?
Yes, the 93LC56B/SN and 93LC56A/SN share identical SOIC-8 (SN) pinouts and package dimensions. Both have CS/CLK/DI/DO/VSS/NC/VCC pin assignments. The only functional difference is memory organization (128×16 vs 256×8) - software must adjust address and data width handling, but PCB layout and soldering are fully interchangeable.
93LC56B/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56B/SN FAQ
1.How can I place an order for 93LC56B/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56B/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/SN reliable?
The price and inventory of 93LC56B/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/SN is usually 5 days.
3.What payment methods are accepted for 93LC56B/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56B/SN?
93LC56B/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56B/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/SN?
For technical support, including 93LC56B/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B/SN requirements.
6.How does Aetrix verify that 93LC56B/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56B/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/SN meets industry standards.
7.What is the process for return or replacement of 93LC56B/SN?
All 93LC56B/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B/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/SN part is unused and in its original packaging.
Return procedure for 93LC56B/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56B/SN Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
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
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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