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Microchip Technology 93LC46CT-E/MNY
- Part No.:
- 93LC46CT-E/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93LC46CT-E/MNY.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
93LC46CT-E/MNY from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and automotive-grade temperature operation (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used for nonvolatile parameter storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC46CT-E/MNY datasheet, 93LC46CT-E/MNY pinout, 93LC46CT-E/MNY application, or 93LC46CT-E/MNY equivalent, key selection criteria include its automotive temperature rating, 8-bit fixed organization (no ORG pin), 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating at up to 3 MHz (VCC ≥ 4.5 V), supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal architecture includes an address decoder, mode decode logic, and output buffer, with all programming operations initiated by CS falling edge (for 93LC versions) and verified via DO pin polling.
Power management is enforced through VCC voltage detection (VPOR = 1.5 V typical), automatic entry into EWDS mode at power-up, and standby current as low as 1 µA. The absence of ORG pin confirms fixed 8-bit organization, eliminating external configuration logic required in C-variant parts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - provides compact nonvolatile storage for calibration data, fault logs, or configuration registers. |
| VCC range | 2.5 V to 5.5 V - supports direct connection to 3.3 V or 5 V microcontroller I/O rails without level shifting. |
| Endurance | 1,000,000 erase/write cycles - ensures reliable field operation over 10+ years in automotive duty cycles. |
| Data retention | >200 years at +25°C - guarantees long-term integrity of stored parameters without refresh. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood and transmission control applications. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - enables use with legacy MCU peripherals lacking SPI hardware. |
| Write cycle time | 6 ms typical (TWC) - defines minimum delay between write commands; impacts firmware timing design. |
Pinout & Package
93LC46CT-E/MNY is housed in an 8-lead 2×3 mm DFN (Dual Flat No-lead) package with exposed pad, RoHS-compliant matte tin finish. Pin 1 is marked by laser dot; exposed pad may be connected to VSS or left floating per Microchip packaging spec.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions to reset internal logic. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; supports clock stretching and stop/resume operation. |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; requires setup/hold timing relative to CLK. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during idle. |
| VSS | Ground | Reference for all I/O and internal circuitry; connects to exposed pad in DFN package. |
| NC | No Internal Connection | Pin 7 is unconnected - must not be tied to any net; floating or grounded per PCB layout best practice. |
| VCC | Power Supply | Supplies core logic and memory array; VPOR threshold (1.5 V) prevents spurious writes during brownout. |
| ORG | Organization Select | Not present - 93LC46T devices are A-variant, fixed 8-bit organization; pin 6 is NC. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control; firmware only waits for DO high before issuing next command. |
| Automatic ERAL before WRAL | Ensures full array erasure prior to bulk write, preventing partial-data corruption without software intervention. |
| Power-on/off data protection | Hardware-level lockout below VPOR = 1.5 V prevents inadvertent writes during power ramp-up/down. |
| Erase/write disable/enable (EWDS/EWEN) | Enables secure write gating: device powers up in EWDS state, requiring explicit EWEN before any programming. |
| Ready/Busy status via DO pin | Allows real-time polling instead of fixed delays - reduces worst-case latency and improves system responsiveness. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Storing fuel trim values, misfire counters, and diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter register providing byte-addressable, field-updatable storage interfaced directly to 8-bit MCU serial port. Use Value: Automotive temperature rating and 1M endurance ensure reliability over 15-year vehicle lifetime with frequent reprogramming during service. |
Use Scenario: Retaining window position memory, seat position presets, and lighting configuration after battery disconnect. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during wake-up sequence to restore user preferences. Use Value: 1 µA standby current minimizes parasitic drain; 200-year data retention prevents loss of settings between vehicle ownership periods. |
| Transmission Control Module (TCM) | Advanced Driver Assistance System (ADAS) Camera Module |
|
Use Scenario: Logging gear shift adaptation data and torque converter clutch learning parameters during dynamic driving conditions. IC Role / Device Role / Timing Role: Robust nonvolatile memory co-located with TCM MCU, surviving vibration, thermal cycling, and EMI. Use Value: Qualified to −40°C to +125°C ambient ensures operation inside sealed transmission housing with oil-cooled electronics. |
Use Scenario: Storing lens calibration coefficients, white balance offsets, and exposure lookup tables for image sensor initialization. IC Role / Device Role / Timing Role: Configuration memory loaded at boot to initialize camera ISP pipeline before video streaming begins. Use Value: Microwire interface allows direct connection to low-pin-count MCUs common in compact camera modules without SPI resource contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-E/MNY | 16-bit organization (64 × 16), same VCC/temp range, identical package - requires firmware rework for word-aligned addressing. | Used where MCU handles 16-bit data natively (e.g., DSP-based motor control); incompatible with byte-oriented protocols. | Select only if system architecture mandates 16-bit word access and memory map alignment justifies firmware changes. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, industrial temp only (−40°C to +85°C), same DFN package. | Lacks automotive qualification; suitable for consumer/industrial designs where cost and SPI availability outweigh temp requirements. | Choose when migrating from Microwire to SPI infrastructure or when automotive qualification is not required. |
Compared with 93LC46BT-E/MNY, the 93LC46CT-E/MNY offers fixed 8-bit compatibility without ORG pin routing complexity; versus AT25010B-MAHL-T, it delivers guaranteed automotive operation but requires Microwire controller support rather than standard SPI.
Availability
93LC46CT-E/MNY is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and medical diagnostic equipment requiring stable component supply with full lifecycle traceability and extended temperature performance.
Supply support for 93LC46CT-E/MNY 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 Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring robust nonvolatile storage with minimal external components.
FAQ
What is the memory organization of 93LC46CT-E/MNY?
The 93LC46CT-E/MNY is an A-variant device with fixed 128 × 8-bit (1 Kbit) organization. Unlike C-variant parts, it lacks an ORG pin and does not support runtime switching between 8-bit and 16-bit modes. This simplifies PCB layout and firmware design by eliminating external pull-up/pull-down requirements for memory width configuration. The 93LC46CT-E/MNY operates exclusively in x8 mode.
Does 93LC46CT-E/MNY require an external pull-up resistor on the DO pin?
No, the 93LC46CT-E/MNY does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy polling, and enters High-Z state when CS is low or during idle. However, if DI and DO are shorted (bus-sharing configuration), a current-limiting resistor is recommended to prevent bus conflict during the dummy zero phase of READ operations - as specified in Section 2.2 of the datasheet for 93LC46CT-E/MNY.
What is the minimum VCC required to prevent accidental writes in 93LC46CT-E/MNY?
The 93LC46CT-E/MNY incorporates hardware voltage detection with VPOR = 1.5 V (typical). When VCC falls below this threshold during power-down or brownout, all erase/write functions are automatically inhibited - ensuring data integrity without firmware intervention. This feature is intrinsic to the 93LCxx family and applies identically across all 93LC46CT-E/MNY units regardless of batch or date code.
How is the Ready/Busy status checked on 93LC46CT-E/MNY?
Ready/Busy status on the 93LC46CT-E/MNY is polled via the DO pin: after initiating ERASE, WRITE, ERAL, or WRAL, CS must be held low for ≥250 ns (TCSL), then brought high. DO = low indicates ongoing operation; DO = high confirms completion. The status is cleared by issuing a Start bit followed by CS low. This method replaces fixed timing delays with deterministic hardware feedback - a key design advantage of the 93LC46CT-E/MNY.
Is 93LC46CT-E/MNY pin-compatible with 93AA46AT-I/MNY?
No, 93LC46CT-E/MNY is not pin-compatible with 93AA46AT-I/MNY. While both use 8-lead DFN packages, the 93AA46AT-I/MNY operates at 1.8–5.5 V and is rated for industrial temperature only (−40°C to +85°C), whereas the 93LC46CT-E/MNY is automotive-rated (−40°C to +125°C) with a 2.5–5.5 V range. Voltage and temperature specifications differ significantly, making direct substitution unsafe without validation - even if physical pinout matches.
93LC46CT-E/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 3 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-TDFN (2x3)
93LC46CT-E/MNY FAQ
1.How can I place an order for 93LC46CT-E/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46CT-E/MNY 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-E/MNY reliable?
The price and inventory of 93LC46CT-E/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46CT-E/MNY is usually 5 days.
3.What payment methods are accepted for 93LC46CT-E/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46CT-E/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46CT-E/MNY?
93LC46CT-E/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46CT-E/MNY 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-E/MNY?
For technical support, including 93LC46CT-E/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46CT-E/MNY requirements.
6.How does Aetrix verify that 93LC46CT-E/MNY is sourced from the original manufacturer or authorized distributors?
All 93LC46CT-E/MNY 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-E/MNY meets industry standards.
7.What is the process for return or replacement of 93LC46CT-E/MNY?
All 93LC46CT-E/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46CT-E/MNY, 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-E/MNY part is unused and in its original packaging.
Return procedure for 93LC46CT-E/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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