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Microchip Technology 93LC46B-I/SN
- Part No.:
- 93LC46B-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46B-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,299
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Product details
Overview
93LC46B-I/SN from Microchip Technology Inc. is a 1Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and 1,000,000 endurance cycles. Used for configuration storage in microcontroller-based embedded systems requiring nonvolatile memory with minimal pin count.
For engineers reviewing the 93LC46B-I/SN datasheet, 93LC46B-I/SN pinout, 93LC46B-I/SN application, or 93LC46B-I/SN equivalent, key selection considerations include its fixed 16-bit organization (no ORG pin), SOIC-8 package compatibility, 3 MHz max clock frequency at 4.5–5.5 V, 6 ms typical write cycle time, and power-on data protection circuitry ensuring reliability during brown-out conditions.
Technical Context
The 93LC46B-I/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed x16 organization. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are initiated by a Start bit followed by opcode and address/data on rising CLK edges.
It uses internal auto-erase-before-write logic and supports sequential read mode when CS remains high. The DO pin serves dual function: data output during READ and Ready/Busy status indicator during programming - low = busy, high = ready - with status valid after minimum TCSL (250 ns) and TSV (200–500 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits); provides compact nonvolatile storage for calibration data, device IDs, or firmware flags. |
| Supply Voltage | 2.5 V to 5.5 V; compatible with 3.3 V and 5 V systems without level-shifting. |
| Clock Frequency | Up to 3 MHz (VCC ≥ 4.5 V); enables fast configuration reads in real-time control loops. |
| Write Cycle Time | 6 ms typical (TWC); determines minimum time between successive writes in logging applications. |
| Endurance | 1,000,000 erase/write cycles; supports frequent updates in field-upgradable devices. |
| Data Retention | Greater than 200 years at 25°C; ensures long-term integrity of stored settings over product lifetime. |
| Temperature Range | –40°C to +85°C (Industrial grade); validated for operation in industrial controllers and automotive body modules. |
Pinout & Package
93LC46B-I/SN is supplied in an 8-lead SOIC package (SN suffix), with standard pinout matching industry-standard Microwire EEPROMs. Pin 1 is CS, Pin 2 is CLK, Pin 3 is DI, Pin 4 is DO, Pin 5 is VSS, Pin 6 is NC (no internal connection), Pin 7 is NC, and Pin 8 is VCC. ORG pin is absent - consistent with 'B'-suffix devices specifying fixed 16-bit organization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby mode. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence without error. |
| DI (Pin 3) | Data Input | Accepts Start bit, opcodes, addresses, and write data; requires setup/hold timing per AC specs. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read operations. |
| VSS (Pin 5) | Ground | Reference for all input thresholds and output levels; must be low-impedance connection. |
| NC (Pin 6 & 7) | No Internal Connection | Unbonded; must be left floating or tied to VSS/VCC per board layout best practices - no functional role. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; includes internal POR detection at ~1.5 V for data protection. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - host only waits for DO status transition or fixed 6 ms timeout. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data corruption without software intervention. |
| Power-On/Off Data Protection | Internal voltage detector disables writes below ~1.5 V, preventing partial writes during power ramp-up/down. |
| Ready/Busy Status via DO | Enables polling-based write completion detection without dedicated status lines or interrupts. |
| Sequential Read Mode | Reduces transaction overhead - holding CS high allows continuous address increment and data streaming. |
Applications
| Industrial Sensor Calibration | Consumer Remote Control ID Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in HVAC or pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at power-up and during field recalibration. Use Value: 64×16-bit capacity holds multiple calibration sets; 2.5–5.5 V operation matches wide-input DC-DC outputs; 1M endurance supports periodic recalibration over 10+ years. |
Use Scenario: Holding unique IR code mappings and user-programmed button assignments in universal remotes. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to 8-bit MCU GPIOs with minimal external components. Use Value: Microwire 3-wire interface reduces MCU pin count; SOIC-8 footprint simplifies PCB routing; 200-year retention preserves user settings across product lifetime. |
| Automotive Body Control Module | Medical Infusion Pump Settings |
|
Use Scenario: Saving seat/mirror position presets and lighting profiles in 12 V automotive systems with local 5 V regulation. IC Role / Device Role / Timing Role: Dedicated EEPROM for user preference storage, isolated from main MCU flash to avoid wear-out. Use Value: Industrial temp rating (–40°C to +85°C) covers under-hood ambient extremes; RoHS-compliant Pb-free SN package meets automotive sourcing requirements. |
Use Scenario: Storing drug library parameters, flow rate limits, and alarm thresholds in battery-powered portable infusion pumps. IC Role / Device Role / Timing Role: Low-power nonvolatile memory retaining critical safety-critical settings during battery swaps or shutdowns. Use Value: 1 µA typical standby current extends battery life; 2.5 V min VCC enables direct use with single-cell Li-ion (3.0–4.2 V) via LDO; data retention >200 years ensures regulatory compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46A-I/SN | 64 × 8-bit organization; same VCC range, timing, and package; no ORG pin. | Requires byte-oriented MCU interface; less efficient for 16-bit data structures like registers or ADC calibration pairs. | Select when system firmware uses 8-bit data alignment or legacy 93LC46A designs require drop-in replacement. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, 20 MHz clock, 5 ms write time. | Requires additional CS and MOSI/MISO lines; incompatible instruction set and timing; higher speed but different protocol stack. | Choose for SPI-native platforms where protocol flexibility outweighs pin count savings of Microwire. |
Compared with 93LC46A-I/SN, the 93LC46B-I/SN delivers twice the data width per access, reducing instruction count for 16-bit parameter storage; versus AT25010B-MAHL-T, it saves one I/O pin and simplifies driver code but trades off maximum throughput and voltage lower limit.
Availability
93LC46B-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer remote control ID storage, and automotive body control module applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC46B-I/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, serving global industrial, automotive, and consumer markets.
The 93LC46B-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable, low-power nonvolatile storage with minimal external components.
FAQ
What is the memory organization of the 93LC46B-I/SN?
The 93LC46B-I/SN has a fixed 64 × 16-bit (1 Kbit) organization. Unlike 'C'-suffix variants, it lacks an ORG pin - confirming dedicated 16-bit word structure. This eliminates external configuration logic and guarantees consistent 16-bit data access timing, making it ideal for storing register-mapped configuration data in microcontroller peripherals.
Does the 93LC46B-I/SN support sequential read mode?
Yes, the 93LC46B-I/SN supports sequential read: when CS remains high after a READ instruction, the internal address counter automatically increments, allowing continuous 16-bit data streaming without reissuing opcodes or addresses. This reduces bus overhead in applications like firmware patch loading or multi-parameter sensor calibration tables.
What is the purpose of the NC pins on the 93LC46B-I/SN SOIC package?
Pins 6 and 7 on the 93LC46B-I/SN are marked NC (No Internal Connection) - they are unconnected die bond pads. These pins must be left floating or tied to VSS/VCC per PCB design rules; they serve no electrical function and do not affect operation. Their presence maintains pin compatibility with other 93XX46 variants that use those positions for ORG or other signals.
How does the 93LC46B-I/SN handle power-loss during write operations?
The 93LC46B-I/SN incorporates power-on/off data protection: an internal voltage detector disables write/erase functions when VCC drops below ~1.5 V. This prevents partial writes or corruption during brown-out events. Combined with self-timed cycles and automatic ERAL before WRAL, it ensures atomicity of configuration updates even under unstable supply conditions.
Can the 93LC46B-I/SN be used in automotive applications?
The 93LC46B-I/SN is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-dash environments, Microchip specifies the 93LC46B-E/SN variant for automotive-grade use. For AEC-Q100-compliant designs or extended-temperature zones, the E-temp version - not the I-temp 93LC46B-I/SN - must be selected.
93LC46B-I/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:
- 1Kbit
- Memory Organization:
- 64 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46B-I/SN FAQ
1.How can I place an order for 93LC46B-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46B-I/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 93LC46B-I/SN reliable?
The price and inventory of 93LC46B-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46B-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC46B-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46B-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46B-I/SN?
93LC46B-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46B-I/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 93LC46B-I/SN?
For technical support, including 93LC46B-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46B-I/SN requirements.
6.How does Aetrix verify that 93LC46B-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46B-I/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 93LC46B-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC46B-I/SN?
All 93LC46B-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46B-I/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 93LC46B-I/SN part is unused and in its original packaging.
Return procedure for 93LC46B-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46B-I/SN Tags
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