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Microchip Technology 93LC46X/SN
- Part No.:
- 93LC46X/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46X/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,522
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Product details
Overview
93LC46X/SN from Microchip Technology Inc. is a 1K-bit (128 × 8 or 64 × 16) low-voltage serial EEPROM with Microwire™ interface, designed for nonvolatile data storage in space-constrained embedded systems. It operates from 2.5V to 5.5V, delivers 100 µA typical active read current at 2.5V, supports ORG-pin-selectable memory organization, and features self-timed erase/write cycles with 1,000,000 endurance cycles and >200-year data retention.
For engineers reviewing the 93LC46X/SN datasheet, 93LC46X/SN pinout, 93LC46X/SN application, or 93LC46X/SN equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases in industrial control and sensor calibration, and validated alternative options for legacy design continuity.
Technical Context
The 93LC46X/SN implements a synchronous 3-wire Microwire-compatible serial interface with CS, CLK, and bidirectional DI/DO lines. Its internal logic decodes 9-bit instructions (e.g., READ, WRITE, ERAL) and supports both x8 and x16 memory configurations via the ORG pin - tied to VCC for 64 × 16 mode or VSS for 128 × 8 mode.
It integrates power-on/off data protection, automatic ERAL before WRAL, and Ready/Busy status polling via DO during erase/write operations. All programming modes require explicit EWEN enable and are inhibited below 1.4V VCC, ensuring robust operation across industrial temperature range (–40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8 or 64 × 16), selectable via ORG pin - enables flexible byte/word addressing in firmware |
| Supply Voltage | 2.5V to 5.5V - supports direct connection to 3.3V or 5V microcontroller I/O without level shifting |
| Active Read Current | 100 µA typical at 2.5V - minimizes power draw in battery-backed or energy-sensitive applications |
| Standby Current | 3 µA typical at 2.5V - ensures ultra-low quiescent consumption during system sleep modes |
| Endurance | 1,000,000 erase/write cycles - guarantees long-term reliability in frequent configuration update scenarios |
| Data Retention | >200 years - eliminates need for periodic refresh or backup in sealed industrial deployments |
| Interface | 3-wire Microwire™ (CS/CLK/DI-DO) - compatible with legacy PIC® MCU peripherals and minimal GPIO resource usage |
Pinout & Package
93LC46X/SN uses an 8-pin rotated SOIC (SN) package per JEDEC MS-012, with pin 1 at bottom-left when notch faces up. This rotated layout differs from standard SOIC: VCC is on pin 2, ORG on pin 8, and NU on pin 1 - critical for PCB layout verification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 3) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| CLK (Pin 4) | Serial Clock | Synchronizes all data transfers; rising edge clocks opcode/address/data; stoppable mid-sequence |
| DI (Pin 5) | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; shares net with DO in single-wire mode |
| DO (Pin 6) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); high-Z when inactive; requires pull-up for reliable status reads |
| VSS (Pin 7) | Ground | Reference for all digital and analog functions; must be low-impedance connection to system GND plane |
| ORG (Pin 8) | Organization Select | Tied to VCC for 64×16 mode or VSS for 128×8 mode; floating only allowed ≤1 MHz clock in x16 mode |
| NU (Pin 1) | No Connect | Not internally bonded; must remain unconnected on PCB - no routing or pull-up/pull-down |
| VCC (Pin 2) | Power Supply | Accepts 2.5V–5.5V; internal voltage monitor disables programming below 1.4V for power-fail safety |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin memory configuration | Enables runtime selection between 128×8 and 64×16 layouts without firmware change - simplifies variant management |
| Self-timed erase/write cycles | Eliminates external timing circuitry; device manages full auto-erase + write sequence autonomously after CS fall |
| Power-on/off data protection | Hardware-enforced lockout below 1.4V VCC prevents corruption during brown-out or hot-swap events |
| Ready/Busy status via DO | Allows polling-based flow control without dedicated interrupt lines - reduces MCU pin count requirements |
| Sequential read function | Enables burst reads across contiguous addresses with single CS assertion - improves throughput in parameter table access |
Applications
| Industrial Sensor Calibration | Embedded System Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated coefficients for temperature, pressure, or humidity sensors in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot and field recalibration; interfaced via PIC MCU's built-in Microwire peripheral. Use Value: Ensures consistent measurement accuracy across product lifetime using 1M-cycle endurance and 200-year retention - avoids recalibration service visits. | Use Scenario: Holding user-defined settings (e.g., display brightness, network ID, alarm thresholds) in medical infusion pumps. IC Role / Device Role / Timing Role: Low-power configuration store updated infrequently but requiring guaranteed persistence through power loss. Use Value: 3 µA standby current at 2.5V extends battery life in portable units; ORG pin allows same firmware to support both byte- and word-addressed variants. |
| Legacy Automotive Subsystem Logging | Consumer Appliance State Memory |
Use Scenario: Recording fault codes and runtime counters in engine control modules where CAN bus bandwidth is constrained. IC Role / Device Role / Timing Role: Serial EEPROM co-located with 8-bit MCU; accessed via GPIO-banged Microwire protocol due to lack of hardware SPI. Use Value: 2.5V minimum operating voltage enables direct integration with 3.3V automotive domains; rotated SN pinout fits dense ECU PCB layouts. | Use Scenario: Saving last-used cooking mode, timer value, and child-lock status in microwave ovens after power cycle. IC Role / Device Role / Timing Role: Standalone memory element interfaced to 4-bit or 8-bit appliance MCU with limited peripheral resources. Use Value: Self-timed 4 ms write cycle eliminates software wait loops; high-Z DO pin prevents bus contention during shared DI/DO wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46C-I/SN | Same 1K-bit capacity and rotated SOIC (SN) package, but with enhanced ESD rating (≥6 kV HBM vs. ≥4 kV) and updated process node | Recommended for new designs per Microchip; identical pinout and instruction set - drop-in replacement | Select 93LC46C-I/SN for production builds requiring extended lifecycle support and higher robustness |
| AT93C46-10SU-2.7 | 1K-bit Microwire EEPROM in standard SOIC (not rotated); 2.7–5.5V supply; 1M endurance; same ORG-selectable organization | Requires PCB layout revision due to standard vs. rotated pinout; no NU pin - pin 1 is CS | Choose AT93C46-10SU-2.7 only when redesigning for second-source availability and standard SOIC footprint |
Compared with 93LC46X/SN, the 93LC46C-I/SN offers improved ESD immunity and ongoing manufacturing support, while the AT93C46-10SU-2.7 provides cross-manufacturer compatibility at the cost of board-level rework - both retain identical functional behavior and instruction timing.
Availability
93LC46X/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and legacy automotive subsystem logging requiring stable component supply and long-term obsolescence management.
Supply support for 93LC46X/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC46X/SN belongs to Microchip's legacy 93LC serial EEPROM family, engineered for cost-sensitive, low-power nonvolatile storage in industrial and automotive applications where Microwire interface compatibility and proven reliability are essential.
FAQ
What is the key difference between 93LC46X/SN and standard 93LC46-I/SN?
The 93LC46X/SN uses a rotated SOIC (SN) pinout - VCC is on pin 2 and NU on pin 1 - whereas the standard 93LC46-I/SN follows conventional SOIC orientation with VCC on pin 8. This rotation enables denser PCB layouts in space-constrained designs. Both share identical electrical specs, instruction set, and ORG-pin memory configuration. The 93LC46X/SN is explicitly offered in "SN" package only, per Microchip's product identification system.
Does 93LC46X/SN support both 8-bit and 16-bit memory access modes?
Yes, 93LC46X/SN supports both 128 × 8-bit and 64 × 16-bit organizations selected by the ORG pin: tie ORG to VSS for x8 mode (128 addresses × 8 bits), or to VCC for x16 mode (64 addresses × 16 bits). The instruction set differs per mode - e.g., READ requires 18 clock cycles in x8 mode versus 25 in x16 mode - and address bit count changes accordingly. Floating ORG is permitted only at ≤1 MHz clock speeds in x16 mode.
How does the Ready/Busy status work on 93LC46X/SN during write operations?
During erase or write cycles, the DO pin of 93LC46X/SN outputs Ready/Busy status: logic low indicates programming is still in progress, and logic high signals completion. To read status, CS must be brought high for ≥250 ns after the initial CS low pulse that started the operation. DO enters high-Z state on CS falling edge, so a pull-up resistor is required to reliably detect the Ready (high) state. Status polling avoids fixed-delay software waits and improves system responsiveness.
Is 93LC46X/SN suitable for new designs, or is it obsolete?
Microchip explicitly states "Not recommended for new designs" for the 93LC46X/SN, advising migration to the 93LC46C-I/SN instead. While 93LC46X/SN remains available for legacy support and repair, the 93LC46C variant offers enhanced ESD protection (≥6 kV HBM), updated process technology, and continued long-term supply. For new projects, Aetrix recommends evaluating 93LC46C-I/SN as a pin- and function-compatible upgrade path for the 93LC46X/SN.
What are the absolute maximum ratings for 93LC46X/SN VCC and operating temperature?
The absolute maximum VCC rating for 93LC46X/SN is 6.5V, though functional operation is specified from 2.5V to 5.5V. The industrial temperature range is –40°C to +85°C, with storage temperature rated from –65°C to +150°C. Ambient temperature under power is qualified to +125°C, supporting deployment in under-hood automotive or high-temperature industrial enclosures. Exceeding 6.5V VCC or operating outside –40°C to +85°C may cause permanent damage or undefined behavior.
93LC46X/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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- 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
93LC46X/SN FAQ
1.How can I place an order for 93LC46X/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46X/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 93LC46X/SN reliable?
The price and inventory of 93LC46X/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46X/SN is usually 5 days.
3.What payment methods are accepted for 93LC46X/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46X/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46X/SN?
93LC46X/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46X/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 93LC46X/SN?
For technical support, including 93LC46X/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46X/SN requirements.
6.How does Aetrix verify that 93LC46X/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46X/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 93LC46X/SN meets industry standards.
7.What is the process for return or replacement of 93LC46X/SN?
All 93LC46X/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46X/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 93LC46X/SN part is unused and in its original packaging.
Return procedure for 93LC46X/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46X/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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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
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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