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Microchip Technology 93LC46BT/ST
- Part No.:
- 93LC46BT/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46BT/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
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Product details
Overview
93LC46BT/ST from Microchip Technology Inc. is a 1 Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for Industrial and Automotive temperature ranges (−40°C to +125°C), and featuring self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling - used for configuration storage in automotive body control modules.
For engineers reviewing the 93LC46BT/ST datasheet, 93LC46BT/ST pinout, 93LC46BT/ST application, or 93LC46BT/ST equivalent, this page delivers verified electrical specs, package-confirmed pin functions, real-world use cases, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The 93LC46BT/ST implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, supporting dedicated 16-bit organization (no ORG pin required). It uses internal auto-erase-before-write logic and provides hardware-level power-on/off data protection via VCC voltage detection (1.5 V threshold).
Its instruction set includes READ (18 clock cycles), WRITE (18 clocks), ERASE (10 clocks), ERAL (10 clocks), WRAL (18 clocks), EWEN/EWDS, all initiated by rising-edge clocked opcodes. The DO pin serves dual role: data output during READ and Ready/Busy status indicator during programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits) - fixed x16 organization; no ORG pin needed; eliminates external logic for word-size selection. |
| VCC Range | 2.5 V to 5.5 V - supports wide supply range including 3.3 V and 5 V systems; enables direct integration into mixed-voltage automotive ECUs. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in firmware update or calibration logging applications. |
| Data Retention | 200 years at +25°C - guarantees nonvolatile storage integrity over full product lifecycle without refresh. |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5 V; 2 MHz at 2.5 V ≤ VCC < 4.5 V - defines maximum SPI-like throughput for configuration reads/writes. |
| Write Cycle Time | 6 ms typical (TWC) - determines minimum time between successive write operations; impacts system responsiveness during parameter updates. |
| Operating Temp | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and transmission control unit environments. |
Pinout & Package
93LC46BT/ST is packaged in an 8-lead TSSOP (ST) with Pb-free Matte Tin finish. Pin 1 is marked by laser dot; device orientation follows standard JEDEC TSSOP layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls entry/exit from Standby mode. |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks opcode/address/data; stoppable mid-sequence without corruption. |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; requires stable setup/hold timing relative to CLK. |
| DO | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS is low or during non-read states. |
| VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling. |
| NC | No Internal Connection | Pin 7 is unconnected; must not be tied to any voltage or signal; floating or grounded per PCB design rules. |
| VCC | Power Supply | Supplies core logic and memory array; includes internal POR circuitry that inhibits operation below 1.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or polling delays beyond Ready/Busy check; simplifies host firmware. |
| Automatic ERAL before WRAL | Ensures full array is erased prior to bulk write; prevents partial writes or data corruption during firmware restore. |
| Power-On/Off Data Protection | Hardware lockout below 1.5 V VCC prevents inadvertent writes during brown-out or power ramp-up/down. |
| Industry Standard 3-Wire Serial I/O | Reduces PCB routing complexity vs. SPI/I²C; compatible with legacy Microwire controllers in automotive MCU peripherals. |
| Ready/Busy Status on DO | Enables efficient polling instead of fixed delay loops; reduces CPU overhead and improves deterministic response. |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing door lock settings, mirror position presets, and lighting profiles across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via MCU's Microwire peripheral during boot and runtime updates. Use Value: 125°C rating ensures reliability near HVAC units; 1M endurance supports daily user customization over 10+ years. |
Use Scenario: Holding I/O mapping tables, calibration coefficients, and communication protocol parameters in modular PLC bases. IC Role / Device Role / Timing Role: Serial EEPROM interfaced to ARM Cortex-M host via GPIO-banged Microwire for field-upgradable firmware metadata. Use Value: 2.5 V min VCC allows direct connection to 3.3 V logic rails; WRAL command enables fast factory reset of entire config space. |
| Medical Infusion Pump Calibration | Smart Energy Meter Tariff Tables |
Use Scenario: Storing flow-rate calibration constants, sensor offset values, and safety thresholds updated during service calibration. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory element accessed only during authenticated maintenance mode. Use Value: EWEN/EWDS commands prevent accidental writes during normal operation; 200-year retention meets FDA long-term device requirements. |
Use Scenario: Maintaining time-of-use tariff schedules, billing multipliers, and utility communication keys in AMI meters. IC Role / Device Role / Timing Role: Low-power serial memory powered from supercap backup during mains outage; retains critical billing data. Use Value: 5 µA standby current (ICCS) extends supercap life; 125°C rating accommodates sealed outdoor meter enclosures. |
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/ST | Same 64×16-bit organization and TSSOP-8 package, but rated only for Industrial temp (−40°C to +85°C); no Automotive qualification. | Not suitable for under-hood or transmission control applications requiring 125°C operation. | Select only for cost-sensitive industrial control where ambient temperature stays below 85°C. |
| AT25010B-SSHL-T | 1 Kbit SPI EEPROM (128×8), 2.5–5.5 V, −40°C to +85°C; uses 4-wire SPI interface (not Microwire); lacks ERAL/WRAL and ORG flexibility. | Requires different MCU peripheral driver and firmware logic; no bulk-erase capability limits recovery speed after corruption. | Choose only if existing design already uses SPI peripherals and does not require automotive temp grade or WRAL functionality. |
Compared with 93LC46B-I/ST, the 93LC46BT/ST adds guaranteed 125°C operation and AEC-Q100-aligned reliability; compared with AT25010B-SSHL-T, it offers native Microwire compatibility, integrated ERAL/WRAL, and automotive qualification - making it the sole drop-in solution for legacy automotive Microwire designs requiring extended temperature support.
Availability
93LC46BT/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, medical infusion pump calibration, and smart energy metering requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for 93LC46BT/ST 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, manufacturing, and sales operations.
The 93LC46BT/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power, nonvolatile storage in automotive, industrial, and consumer systems requiring Microwire interface compatibility and extended temperature resilience.
FAQ
What is the memory organization of the 93LC46BT/ST?
The 93LC46BT/ST has a fixed 64-word × 16-bit (x16) organization. Unlike 'C' variants, it does not include an ORG pin - its architecture is hardwired for 16-bit data transfers, eliminating external configuration logic and reducing BOM count in automotive ECU designs.
Does the 93LC46BT/ST support the WRAL (Write All) command?
Yes, the 93LC46BT/ST fully supports the WRAL command, which writes the same 16-bit data to all 64 memory locations. It internally executes an automatic ERAL cycle first, and requires VCC ≥ 4.5 V for reliable operation - a key capability for factory reset or firmware recovery sequences.
What is the function of the NC pin on the 93LC46BT/ST?
Pin 7 on the 93LC46BT/ST is labeled NC (No Connection) and has no internal bond wire or circuit connection. It must remain unconnected - neither tied to VCC nor VSS - to avoid unintended leakage paths or ESD susceptibility in the TSSOP-8 package.
How does the Ready/Busy status work on the 93LC46BT/ST?
The DO pin of the 93LC46BT/ST outputs Ready/Busy status during erase/write operations: DO = low indicates active programming; DO = high means completion. Status is only valid when CS is brought high after ≥250 ns low time (TCSL); otherwise DO remains in High-Z state.
Is the 93LC46BT/ST RoHS compliant and Pb-free?
Yes, the 93LC46BT/ST is RoHS compliant and features a Pb-free Matte Tin (Sn) finish on its TSSOP-8 package terminals, meeting J-STD-609 Category 1 requirements and supporting lead-free reflow soldering processes up to 260°C peak temperature.
93LC46BT/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC46BT/ST FAQ
1.How can I place an order for 93LC46BT/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT/ST 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/ST reliable?
The price and inventory of 93LC46BT/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46BT/ST is usually 5 days.
3.What payment methods are accepted for 93LC46BT/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT/ST?
93LC46BT/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT/ST 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/ST?
For technical support, including 93LC46BT/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT/ST requirements.
6.How does Aetrix verify that 93LC46BT/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46BT/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 93LC46BT/ST?
All 93LC46BT/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT/ST, 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/ST part is unused and in its original packaging.
Return procedure for 93LC46BT/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46BT/ST Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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