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Microchip Technology 93LC46CT-I/SN
- Part No.:
- 93LC46CT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46CT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:14,591
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Product details
Overview
93LC46CT-I/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for industrial temperature range (−40°C to +85°C), and housed in an 8-lead SOIC package (SN). It features self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling via DO pin - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46CT-I/SN datasheet, 93LC46CT-I/SN pinout, 93LC46CT-I/SN application, or 93LC46CT-I/SN equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), 8-bit fixed organization (no ORG pin), industrial-grade temperature rating, SOIC-8 packaging, and Microwire protocol timing compliance at up to 3 MHz.
Technical Context
This device implements a synchronous serial EEPROM architecture using a 3-wire Microwire interface (CS, CLK, DI/DO) with no internal address latch - all operations require explicit opcode, address, and data transmission. It uses CMOS technology with on-chip power-on reset and voltage-detect circuitry (VPOR = 1.5V typical) to prevent inadvertent writes during power ramp.
It supports dedicated 8-bit organization ('A' variant), eliminating ORG pin dependency; erase/write cycles are fully self-timed (TWC = 6 ms max), and includes hardware-level data protection via EWEN/EWDS commands and automatic ERAL before WRAL. The DO pin serves dual function: serial data output and Ready/Busy status indicator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin required. |
| VCC Range | 2.5V to 5.5V - supports wide supply range including 3.3V and 5V systems. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI mode or quad I/O. |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5V - defines maximum instruction throughput and programming speed. |
| Write Cycle Time | 6 ms max (TWC) - self-timed; no external delay needed; includes auto-erase. |
| Data Retention | >200 years - ensures long-term nonvolatile storage integrity in unpowered state. |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0V per characterization. |
Pinout & Package
8-lead SOIC package (SN), Pb-free Matte Tin finish, standard footprint compatible with JEDEC MS-012AA. Pin 1 marked by laser dot or notch; body dimensions 4.9 mm × 3.9 mm × 1.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry/exit. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL define timing margins. |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; shares net with DO only with external current-limiting resistor. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status polling. |
| VSS | Ground | Reference for all logic and analog functions; must be connected directly to system ground plane. |
| NC | No Internal Connection | Pin 7 in SOIC package - left unconnected; no internal bond wire or circuitry attached. |
| VCC | Power Supply | Supply input; VPOR detection (1.5V) prevents operation below safe voltage threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - 6 ms max cycle time includes auto-erase. |
| Automatic ERAL before WRAL | Ensures full array erase prior to Write All; avoids partial-write corruption without host intervention. |
| Ready/Busy Status via DO | Enables polling-based firmware flow control - no interrupt or status register required. |
| Power-On/Off Data Protection | Hardware VPOR circuitry blocks writes below 1.5V; prevents data corruption during brown-out. |
| EWEN/EWDS Command Lock | Requires explicit Erase/Write Enable before programming - prevents accidental overwrites in runtime. |
Applications
| Industrial Sensor Calibration Storage | Consumer Appliance Configuration Memory |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and user-adjusted thresholds in HVAC or pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed infrequently during boot or service mode; Microwire interface minimizes MCU GPIO usage. Use Value: 200-year data retention and 1M endurance ensure calibration stability across product lifetime without battery backup. |
Use Scenario: Holding user preferences (e.g., timer settings, display brightness, language) in microwave ovens or washing machines. IC Role / Device Role / Timing Role: Serial EEPROM interfaced to 8-bit MCU via 3-wire bus; operates at 3.3V or 5V depending on main controller supply. Use Value: Low standby current (1 µA) extends system sleep-mode battery life; SOIC-8 allows easy rework and board-level test access. |
| Medical Device Parameter Backup | Automotive Body Control Module NVM |
|
Use Scenario: Saving critical operational parameters (e.g., dose limits, alarm thresholds) in portable infusion pumps between power cycles. IC Role / Device Role / Timing Role: Fail-safe configuration store with hardware write-protection (EWDS); accessed only during initialization or clinician setup. Use Value: Industrial temp rating (−40°C to +85°C) covers extended ambient ranges; RoHS-compliant for medical regulatory compliance. |
Use Scenario: Storing door lock configuration, mirror position presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Microwire EEPROM integrated into CAN/LIN subsystem; reads/writes triggered by diagnostic requests or user inputs. Use Value: 2.5V min VCC supports start-stop system voltage dips; 6 ms write time enables fast parameter updates during vehicle wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/SN | 16-bit organization (64 × 16), same VCC range and package; requires ORG = VSS for x8 emulation but not pin-compatible. | Not drop-in; requires firmware address/data width adaptation; unsuitable if fixed x8 protocol is hard-coded. | Select only if migrating to wider word access or consolidating part numbers across x8/x16 variants. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5V, SOIC-8; lacks ERAL/WRAL and hardware write-protection commands. | Requires SPI driver stack instead of Microwire; no built-in erase-all or write-all atomicity; higher software overhead. | Choose when existing design uses SPI peripherals and does not require ERAL/WRAL or EWEN/EWDS security features. |
Compared with 93LC46B-I/SN and AT25010B-SSHL-T, the 93LC46CT-I/SN provides guaranteed x8 organization without ORG pin dependency, native Microwire timing compliance, and hardware-enforced write protection - making it optimal for legacy or resource-constrained 3-wire systems requiring deterministic erase/write behavior.
Availability
93LC46CT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device parameter backup requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for 93LC46CT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC46 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC46CT-I/SN?
The 93LC46CT-I/SN is a fixed 128 × 8-bit (1 Kbit) organization device - designated as an 'A' variant - meaning it has no ORG pin and always operates in 8-bit mode. This eliminates configuration uncertainty and simplifies firmware development compared to 'C' variants that require external logic level setting.
Does the 93LC46CT-I/SN support SPI communication?
No, the 93LC46CT-I/SN uses a Microwire-compatible 3-wire serial interface (CS, CLK, DI/DO) and is not SPI-compatible. It lacks the SI/SO pins and mode-select logic required for SPI; attempting SPI framing will result in failed command recognition and no valid response.
What is the purpose of the NC pin on the 93LC46CT-I/SN SOIC package?
Pin 7 on the 93LC46CT-I/SN SOIC package is labeled NC (No Connection) - it has no internal bond wire or circuit connection. It must remain unconnected on the PCB; routing or soldering to this pin may cause mechanical stress or unintended coupling but has no electrical effect on device operation.
How does the 93LC46CT-I/SN protect against accidental writes during power-up?
The 93LC46CT-I/SN incorporates a voltage-detect circuit (VPOR) that holds all operations inhibited until VCC rises above ~1.5V. Additionally, it powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN command before any erase or write instruction is accepted - providing dual-layer hardware protection.
Can the 93LC46CT-I/SN be used in automotive applications?
The 93LC46CT-I/SN is rated for Industrial temperature range (−40°C to +85°C), not Automotive (−40°C to +125°C). While it may function in some under-hood environments, it is not qualified or tested for AEC-Q100 Grade 2 or Grade 3 requirements; use 93LC46CT-E/SN or equivalent automotive-grade variants for certified automotive deployment.
93LC46CT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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:
- 3 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
93LC46CT-I/SN FAQ
1.How can I place an order for 93LC46CT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46CT-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 93LC46CT-I/SN reliable?
The price and inventory of 93LC46CT-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 93LC46CT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC46CT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46CT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46CT-I/SN?
93LC46CT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46CT-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 93LC46CT-I/SN?
For technical support, including 93LC46CT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46CT-I/SN requirements.
6.How does Aetrix verify that 93LC46CT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46CT-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 93LC46CT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC46CT-I/SN?
All 93LC46CT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46CT-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 93LC46CT-I/SN part is unused and in its original packaging.
Return procedure for 93LC46CT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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