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Microchip Technology 93LC46BT-E/MS
- Part No.:
- 93LC46BT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC46BT-E/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
93LC46BT-E/MS from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating over 2.5–5.5V supply, rated for automotive temperature range (−40°C to +125°C), and housed in an 8-lead MSOP package. It provides nonvolatile storage for configuration data in automotive body control modules, sensor calibration registers, and power management ICs.
For engineers reviewing the 93LC46BT-E/MS datasheet, 93LC46BT-E/MS pinout, 93LC46BT-E/MS application, or 93LC46BT-E/MS equivalent, key selection criteria include its automotive-grade qualification, 1M erase/write endurance, 200-year data retention, self-timed write cycle (6 ms), and Ready/Busy status signaling via DO pin.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals - no ORG pin (dedicated 8-bit organization). All instructions (READ, WRITE, ERASE, ERAL, WRAL) are initiated by a Start bit followed by opcode and address/data on rising CLK edges, with DO providing either output data or Ready/Busy status depending on operation state.
It features hardware-based power-on/off data protection, automatic erase-before-write, and Erase/Write Enable/Disable (EWEN/EWDS) logic to prevent accidental programming. The internal architecture includes a 128-word × 8-bit memory array, address counter, mode decode logic, and output buffer - all fabricated in low-power CMOS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit organization; no ORG pin - fixed x8) |
| Supply Voltage | 2.5 V to 5.5 V - supports wide-range automotive rail compatibility |
| Temperature Range | −40°C to +125°C (Automotive grade E-temp) - qualified for under-hood use |
| Endurance | 1,000,000 erase/write cycles - enables frequent field updates in telematics or firmware patching |
| Data Retention | Greater than 200 years at +85°C - ensures long-term reliability in sealed automotive modules |
| Write Cycle Time | 6 ms typical - self-timed auto-erase-and-write eliminates external timing control |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage on microcontrollers |
| Standby Current | 1 µA max at I-temp, 5 µA max at E-temp - critical for always-on vehicle networks |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, Pb-free matte tin finish. Pin 1 marked by laser dot; exposed pad optional (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CS (Chip Select) | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed write on falling edge |
| 2 | CLK (Serial Clock) | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence without error |
| 3 | DI (Data In) | Accepts Start bit, opcodes, addresses, and write data; tolerant of bus conflict when shared with DO |
| 4 | DO (Data Out) | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| 5 | VSS | Ground reference for all I/O and core logic; must be low-impedance for noise immunity |
| 6 | NC | No internal connection - left unconnected; not used for signal or thermal relief |
| 7 | ORG | No internal connection on 93LC46B - this pin is NC (not tied to VSS/VCC); irrelevant for x8-only operation |
| 8 | VCC | Power supply input; internal POR circuit triggers at ~1.5 V; requires ≥4.5 V for ERAL/WRAL |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing circuitry - write completes autonomously in 6 ms |
| Ready/Busy status on DO | Enables polling-based firmware flow control without interrupt or timeout overhead |
| Automatic ERAL before WRAL | Ensures full-array write integrity - no separate erase command required before WRAL |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents corruption during brown-out or hot-swap events |
| EWEN/EWDS security logic | Requires explicit enable before any write - prevents spurious writes from noise or reset glitches |
| Sequential read mode | Reduces host CPU overhead - continuous address increment while CS remains high |
Applications
| Automotive Body Control Unit (BCU) | Industrial Sensor Calibration Module |
|---|---|
Use Scenario: Storing door lock configuration, mirror position presets, and lighting profiles across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently but requiring guaranteed retention over 15+ years. Use Value: 200-year data retention and automotive temp rating ensure settings persist through vehicle lifetime without refresh. |
Use Scenario: Holding factory-trimmed offset/gain coefficients for analog sensor front-ends in harsh industrial environments. IC Role / Device Role / Timing Role: Calibration memory written once at production test, then read at power-up. Use Value: 1M endurance allows re-trimming during field service; 1 µA standby current minimizes system leakage. |
| Smart Power Distribution Box | Medical Infusion Pump Controller |
Use Scenario: Recording fault logs, fuse trip history, and load configuration for diagnostic traceability. IC Role / Device Role / Timing Role: Event-triggered write storage with immediate Ready/Busy feedback for deterministic logging. Use Value: 6 ms self-timed write and DO-busy polling enable precise timestamp alignment without software delays. |
Use Scenario: Securing drug library parameters, dose limits, and user authorization keys in battery-powered portable devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter store with hardware write protection (EWEN/EWDS). Use Value: EWDS default-on behavior prevents accidental overwrite during ESD events or power transients. |
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/MS | Same 128×8-bit organization, MSOP package, but rated for Industrial (−40°C to +85°C) only | Lacks automotive qualification - unsuitable for under-hood or safety-critical systems | Select only if operating environment stays within I-temp and cost sensitivity outweighs AEC-Q200 alignment needs |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit, 1.8–5.5 V, 2 MHz max clock, 5 ms write time, SOIC-8 | Different protocol stack - requires SPI peripheral instead of generic GPIO bit-banging | Choose when existing design uses SPI peripherals exclusively and MSOP footprint is acceptable |
Compared with 93LC46B-I/MS, the 93LC46BT-E/MS adds automotive qualification and tighter VCC min spec (2.5 V vs. same), while AT25010B-MAHL-T trades Microwire simplicity for higher clock speed and broader voltage range - but demands SPI hardware support.
Availability
93LC46BT-E/MS is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and medical device controllers requiring stable component supply across extended product lifecycles.
Supply support for 93LC46BT-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, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving automotive, industrial, consumer, and communications markets.
The 93LC46 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for low-pin-count, low-power, and high-reliability nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the memory organization of the 93LC46BT-E/MS?
The 93LC46BT-E/MS is a dedicated 128 × 8-bit (1Kbit) device - it has no ORG pin and operates exclusively in x8 mode. This is confirmed by its part number suffix 'B' and the Device Selection Table, which lists '93LC46B' as 64 × 16-bit for x16 versions - but the 'T-E/MS' variant corresponds to the 8-bit organization per Microchip's marking code table ('L46B' = 93LC46B, and '3L46BT' marking confirms E-temp 93LC46B in MSOP).
Does the 93LC46BT-E/MS require an external pull-up resistor on the DO line?
No - the 93LC46BT-E/MS does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when not in use. A pull-up is only recommended if sharing DI/DO on a single bidirectional line to limit bus conflict current, per Section 2.2 of the datasheet.
Can the 93LC46BT-E/MS perform sequential reads across the entire memory array?
Yes - the 93LC46BT-E/MS supports sequential read: after issuing a READ instruction with an initial address, holding CS high causes the internal address counter to auto-increment, outputting subsequent bytes on each CLK rising edge until the end of the array (address 127) is reached, as described in Section 2.7.
What is the minimum VCC required for ERAL and WRAL operations on the 93LC46BT-E/MS?
VCC must be ≥4.5 V for proper execution of ERAL (Erase All) and WRAL (Write All) commands on the 93LC46BT-E/MS. This requirement is explicitly stated in Figures 2-3, 2-4, 2-10, and 2-11, and reinforced in notes accompanying Tables A14 and A15 - operation below 4.5 V will not complete these bulk operations reliably.
How is the Ready/Busy status signaled on the 93LC46BT-E/MS during a write cycle?
During a write cycle, the 93LC46BT-E/MS signals Ready/Busy status on the DO pin: DO = low indicates programming is still in progress; DO = high indicates completion. To read this status, CS must be brought high for ≥250 ns after the write initiation (TCSL), and DO must be sampled on the rising edge of CLK - as defined in Sections 2.4, 2.8, and Figure 2-8.
93LC46BT-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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93LC46BT-E/MS FAQ
1.How can I place an order for 93LC46BT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT-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 93LC46BT-E/MS reliable?
The price and inventory of 93LC46BT-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 93LC46BT-E/MS is usually 5 days.
3.What payment methods are accepted for 93LC46BT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT-E/MS?
93LC46BT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT-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 93LC46BT-E/MS?
For technical support, including 93LC46BT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT-E/MS requirements.
6.How does Aetrix verify that 93LC46BT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93LC46BT-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 93LC46BT-E/MS meets industry standards.
7.What is the process for return or replacement of 93LC46BT-E/MS?
All 93LC46BT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT-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 93LC46BT-E/MS part is unused and in its original packaging.
Return procedure for 93LC46BT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46BT-E/MS Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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