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Microchip Technology 93LC46CT-E/MS
- Part No.:
- 93LC46CT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC46CT-E/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,961
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Product details
Overview
93LC46CT-E/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, supporting Industrial and Automotive temperature ranges (−40°C to +125°C), and housed in an 8-lead MSOP package. It features self-timed erase/write cycles, automatic erase-all before write-all, power-on/off data protection, and Ready/Busy status signaling - used for nonvolatile parameter storage in automotive body control modules.
For engineers reviewing the 93LC46CT-E/MS datasheet, 93LC46CT-E/MS pinout, 93LC46CT-E/MS application, or 93LC46CT-E/MS equivalent, key selection considerations include its 2.5–5.5 V supply range, 8-bit fixed organization (no ORG pin), 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire host controllers requiring minimal GPIO overhead.
Technical Context
The 93LC46CT-E/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, using edge-triggered clocking (data latched on rising CLK). Its internal architecture includes address decoding, mode logic, and a 128 × 8-bit memory array with auto-erase-before-write capability - eliminating need for external erase commands prior to write operations.
It operates in EWDS (Erase/Write Disable) state at power-up, requiring explicit EWEN instruction before any programming; DO pin serves dual role as serial data output and Ready/Busy indicator during erase/write, with status valid after minimum TCSL (250 ns) and detectable via polling. No ORG pin is present - confirming fixed 8-bit organization per device family specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - provides compact nonvolatile storage for calibration data, configuration registers, or fault logs in space-constrained designs. |
| VCC range | 2.5 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in applications requiring frequent updates, such as adaptive lighting or sensor offset correction. |
| Data retention | Greater than 200 years at 25°C - guarantees persistent storage across product lifetime without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - reduces MCU pin count and simplifies PCB routing versus SPI or I²C. |
| Temperature range | −40°C to +125°C (Automotive grade) - qualified for under-hood and body-control unit deployment. |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - enables fast parameter loading during system boot or diagnostics. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating), RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions; deselects device into standby mode. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized timing for opcode, address, and data transfer; stoppable mid-sequence for host flexibility. |
| 3 (DI) | Data Input | Receives Start bit, opcodes (e.g., 01 for WRITE), 7-bit address, and 8-bit data; shares net with DO only with external current-limiting resistor. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters high-impedance when CS is low or during non-read states. |
| 5 (VSS) | Ground | Reference return path for all signals; exposed pad may be connected to VSS for thermal and EMI improvement. |
| 6 (NC) | No Internal Connection | Unbonded pin; must be left floating or tied to VSS per layout best practice - not usable as strap or control. |
| 7 (ORG) | Organization Select | Not applicable - 93LC46T devices are 'A'-type variants with fixed 8-bit organization; ORG pin is NC per Device Selection Table. |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply input; internal POR circuit triggers at ~1.5 V - prevents spurious writes during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - WRAL completes in ≤15 ms, ERAL in ≤6 ms, WRITE in ≤6 ms (VCC ≥ 4.5 V). |
| Automatic ERAL before WRAL | Ensures full memory initialization before bulk write - no separate erase command required, reducing firmware complexity. |
| Power-on/off data protection | Hardware-enforced write inhibition below VCC threshold (~1.5 V) - prevents corruption during power ramp-up/down. |
| Ready/Busy status via DO pin | Enables efficient polling-based operation without dedicated interrupt line - reduces MCU resource usage. |
| 128 × 8-bit fixed organization | Simplifies address management in host firmware - no ORG pin strapping or runtime configuration needed. |
Applications
| Automotive Body Control Unit | Industrial Sensor Node |
|---|---|
Use Scenario: Storing door lock configuration, mirror position presets, and seat memory profiles in a vehicle body controller. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during ignition cycling and battery voltage transients. Use Value: Enables user-customizable settings retention across 15+ year vehicle service life without backup capacitor or supercapacitor support. |
Use Scenario: Retaining calibrated offset/gain coefficients and sensor ID in a wireless temperature/humidity node. IC Role / Device Role / Timing Role: Low-power configuration memory accessed infrequently during commissioning or recalibration. Use Value: Achieves <1 µA standby current (ICCS) and 200-year data retention - eliminates field recalibration visits. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Logging dose history, alarm thresholds, and operator access codes in Class II medical equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant event log storage with hardware write-protection (EWDS/EWEN). Use Value: Meets IEC 62304 traceability requirements via deterministic 1M-cycle endurance and controlled write sequencing. |
Use Scenario: Storing tariff schedules, meter calibration constants, and firmware update flags in ANSI C12.20-compliant meters. IC Role / Device Role / Timing Role: High-reliability configuration register bank accessible over isolated RS-485 interface. Use Value: Supports 10,000+ meter deployments with zero field failures attributed to EEPROM wear-out over 20-year design life. |
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/MS | 16-bit organization (64 × 16), same VCC range and package - requires host firmware adaptation for word-aligned addressing. | Used where wider data paths reduce transaction count (e.g., storing 16-bit ADC calibration slopes). | Select only if host system benefits from 16-bit transfers and can manage dual-byte addressing logic. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, same endurance and retention - lacks Ready/Busy pin; uses WIP flag in status register. | Suitable for systems already using SPI peripherals; requires additional GPIO or status register polling overhead. | Prefer when migrating from legacy SPI-based designs or when leveraging existing SPI driver stacks. |
Compared with 93LC46BT-E/MS, the 93LC46CT-E/MS avoids ORG pin dependency and simplifies firmware; versus AT25010B-MAHL-T, it offers native Ready/Busy signaling for deterministic timing but requires Microwire-compatible controller support.
Availability
93LC46CT-E/MS is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor calibration, and medical device configuration storage requiring stable component supply across extended product lifecycles.
Supply support for 93LC46CT-E/MS 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 microcontroller, analog, FPGA, 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-power, nonvolatile storage in automotive, industrial, and consumer applications where Microwire interface simplicity and proven reliability are critical.
FAQ
What is the memory organization of the 93LC46CT-E/MS?
The 93LC46CT-E/MS is a fixed 128 × 8-bit (1 Kbit) device - designated as a 'T' variant in the 93LC46A/B/C family, meaning it has no ORG pin and operates exclusively in 8-bit mode. This is confirmed in the Device Selection Table, where '93LC46A' entries list 'No' for ORG Pin and '8-bit' for Word Size, and the 93LC46CT-E/MS part number suffix aligns with the 'A'-type configuration.
Does the 93LC46CT-E/MS support both Industrial and Automotive temperature grades?
Yes, the 93LC46CT-E/MS is rated for −40°C to +125°C (Automotive 'E' grade), as indicated by the 'E' in its part number and verified in the Device Selection Table under Temp Ranges for 93LC46A devices. It also supports Industrial grade (−40°C to +85°C), but the 'E' suffix confirms full automotive qualification including extended temperature stress testing and AEC-Q100 alignment.
What is the function of the ORG pin on the 93LC46CT-E/MS?
The ORG pin is not functional on the 93LC46CT-E/MS - it is marked 'NC' (No internal connection) in the Pin Function Table and explicitly noted as absent on 'A' and 'B' devices. The 'T' suffix denotes the 8-lead MSOP package, and the 'A'-type base part (93LC46A) has no ORG pin; therefore, this pin must be left unconnected or tied to VSS per layout guidelines.
How does the Ready/Busy status work on the 93LC46CT-E/MS?
The DO pin of the 93LC46CT-E/MS outputs Ready/Busy status during erase/write operations: DO = low indicates active programming, DO = high means completion. To read status, CS must be brought high for ≥250 ns after TCSL, then sampled - confirmed in Section 2.4 and Figure 2-1. Status clears automatically after cycle completion or via Start-bit + CS low sequence.
What packaging and marking details apply to the 93LC46CT-E/MS?
The 93LC46CT-E/MS uses an 8-lead MSOP package (3.0 × 3.0 mm, 0.65 mm pitch) with matte tin (Pb-free) finish. Per Package Marking Information, top-side marking includes '3L46CT' followed by temperature code 'E', year/week code (e.g., '528'), and traceability characters - consistent with Microchip's standard MSOP marking scheme for 93LC46C variants.
93LC46CT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
93LC46CT-E/MS FAQ
1.How can I place an order for 93LC46CT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46CT-E/MS 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/MS reliable?
The price and inventory of 93LC46CT-E/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 93LC46CT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46CT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46CT-E/MS?
93LC46CT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46CT-E/MS 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/MS?
For technical support, including 93LC46CT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46CT-E/MS requirements.
6.How does Aetrix verify that 93LC46CT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93LC46CT-E/MS 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/MS meets industry standards.
7.What is the process for return or replacement of 93LC46CT-E/MS?
All 93LC46CT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46CT-E/MS, 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/MS part is unused and in its original packaging.
Return procedure for 93LC46CT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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