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Microchip Technology 93LC46BT/SN
- Part No.:
- 93LC46BT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46BT/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,978
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Product details
Overview
93LC46BT/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating over 2.5–5.5 V, rated for Industrial (-40°C to +85°C) and Automotive (-40°C to +125°C) temperature ranges, and housed in an 8-lead SOIC package (SN). It delivers nonvolatile storage for configuration data in microcontroller-based systems requiring robust write endurance and power-on/off data protection.
For engineers reviewing the 93LC46BT/SN datasheet, 93LC46BT/SN pinout, 93LC46BT/SN application, or 93LC46BT/SN equivalent, key selection criteria include its 8-bit organization (no ORG pin), 1 million erase/write cycles, 200+ year data retention, self-timed write/erase, and Ready/Busy status signaling via DO pin - all critical for embedded firmware parameter storage and calibration memory.
Technical Context
The 93LC46BT/SN implements a synchronous 3-wire Microwire interface (CS, CLK, DI/DO) with start-bit detection and opcode-driven command set. It uses internal auto-erase before write and supports ERAL (Erase All) and WRAL (Write All) instructions with dedicated timing (6 ms TWC for erase/write, 6 ms TEC for ERAL).
It features power-on reset detection (VPOR = 1.5 V typical), EWEN/EWDS write-protection logic, and a high-impedance DO pin that toggles between data output and Ready/Busy status - enabling polling without external hardware. The device lacks an ORG pin, confirming fixed 8-bit word organization per the 'T' suffix and Device Selection Table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - provides compact, byte-addressable nonvolatile storage for small configuration tables or calibration constants. |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic systems without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable applications like sensor offset trimming. |
| Data retention | >200 years at 25°C - guarantees data integrity across product lifetime without refresh. |
| Write cycle time | 6 ms max (TWC) - defines minimum delay between write commands; enables deterministic firmware timing control. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - reduces MCU GPIO count and simplifies PCB routing vs. SPI/I²C. |
| Temperature grade | Industrial and Automotive (-40°C to +125°C) - qualified for under-hood and industrial control environments. |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, 150 mil width, standard footprint compatible with JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge for 93LC devices. |
| CLK | Serial Clock | Synchronizes all data transfers; rising-edge sampling of DI and DO; clock can be paused mid-sequence. |
| DI | Data Input | Receives start bit, opcodes, addresses, and write data; shares net with DO only with series resistor to prevent bus conflict. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read operations. |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| NC | No Connect | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice - no functional role. |
| VCC | Power Supply | Supplies core logic and memory array; includes internal POR circuit triggering at ~1.5 V to inhibit writes during brownout. |
| ORG | Organization Select | Not present on 93LC46B/T - this pin is NC (no internal connection) as confirmed by Device Selection Table and Pin Function Table. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or firmware delays - write completion signaled via DO pin polling. |
| Automatic ERAL before WRAL | Ensures full-array write reliability without requiring separate erase command - simplifies firmware implementation. |
| Power-on/off data protection | Hardware-level VCC monitoring prevents inadvertent writes during power ramp-up/down - no software intervention required. |
| Ready/Busy status on DO | Enables real-time progress monitoring of erase/write operations using a single I/O line - reduces pin count and polling overhead. |
| Industry-standard 3-wire interface | Direct compatibility with legacy Microwire controllers and widely supported MCU peripheral modules - minimizes driver development effort. |
Applications
| Motor Control Configuration | Smart Sensor Calibration |
|---|---|
Use Scenario: Storing motor phase timing offsets, current limit thresholds, and fault recovery parameters in BLDC motor drivers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at startup and updated during field calibration routines. Use Value: Enables factory and field tuning without soldering or firmware reflash; retains settings across 10+ years of operation. | Use Scenario: Holding temperature-compensated gain/offset coefficients for MEMS pressure sensors in automotive HVAC modules. IC Role / Device Role / Timing Role: Calibration data store read once per power-on, written only during production test or service recalibration. Use Value: Achieves ±0.1% measurement accuracy over -40°C to +125°C without active refresh or backup battery. |
| Industrial PLC I/O Mapping | Medical Device Settings Storage |
Use Scenario: Persisting user-defined digital I/O assignments and debounce timing values in modular PLC base units. IC Role / Device Role / Timing Role: Parameter EEPROM interfaced via MCU's Microwire peripheral during boot initialization. Use Value: Supports hot-swap I/O module reconfiguration while maintaining deterministic 6 ms write latency for safety-critical updates. | Use Scenario: Securing patient-specific therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable insulin pumps. IC Role / Device Role / Timing Role: Tamper-resistant configuration memory with write-protection enabled via EWDS after each update. Use Value: Meets IEC 62304 Class C software requirements through hardware-enforced write disable and 200-year data retention. |
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 | Same 128×8-bit organization, identical SOIC-8 package, but rated for Industrial temp only (-40°C to +85°C); lacks Automotive qualification. | Not suitable for under-hood or extended-temperature industrial deployments requiring AEC-Q100 compliance. | Select when Automotive temperature range is unnecessary and cost optimization is prioritized. |
| AT25010B-SSHL-T | 1 Kbit SPI EEPROM (not Microwire), 2.5–5.5 V, 20 MHz max clock, 5 ms write cycle, SOIC-8 package. | Requires SPI interface instead of Microwire; incompatible instruction set and timing - firmware driver rewrite needed. | Choose only if migrating to SPI infrastructure and needing faster clock rates; not drop-in compatible. |
Compared with 93LC46B-I/SN, the 93LC46BT/SN adds Automotive temperature support and same-pinout compatibility; versus AT25010B-SSHL-T, it preserves Microwire protocol fidelity and eliminates driver porting, though at lower maximum clock speed.
Availability
93LC46BT/SN is available at Aetrix Electronics and suitable for motor control, smart sensor, industrial PLC, and medical device applications requiring stable component supply, long-lifecycle assurance, and AEC-Q100-compliant nonvolatile memory.
Supply support for 93LC46BT/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 93LC46B product line delivers low-power, Microwire-compatible serial EEPROMs optimized for space-constrained embedded systems requiring reliable, low-voltage nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC46BT/SN?
The 93LC46BT/SN is a fixed 128 × 8-bit (1 Kbit) organization device with no ORG pin - confirmed by the Device Selection Table where 'T' denotes 8-bit 'A' variant. It does not support 16-bit mode, and the ORG pin is marked NC (no internal connection) in the Pin Function Table, eliminating configuration ambiguity during layout and firmware design.
Does the 93LC46BT/SN support the Automotive temperature range?
Yes, the 93LC46BT/SN is qualified for the Automotive temperature range (-40°C to +125°C), as explicitly listed in the Device Selection Table under "Temp Ranges" for 93LC46B entries with 'T' suffix. This qualification meets AEC-Q100 stress test requirements for automotive electronics deployment.
How is write protection implemented on the 93LC46BT/SN?
The 93LC46BT/SN implements hardware write protection via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. It powers up in EWDS mode, requiring an explicit EWEN command before any erase or write operation. After programming, issuing EWDS disables further writes - preventing accidental corruption during system noise or power transients.
What is the maximum clock frequency supported by the 93LC46BT/SN?
The 93LC46BT/SN supports a maximum clock frequency of 3 MHz at VCC ≥ 4.5 V, 2 MHz at VCC = 2.5–4.5 V, and 1 MHz at VCC = 1.8–2.5 V (though 93LC variants require min. 2.5 V). These AC specifications are defined in Table 1-2 and ensure reliable timing margin across voltage and temperature ranges.
Can the 93LC46BT/SN be used with a shared DI/DO bus?
Yes, but with caution: DI and DO may share a net only when a series resistor (e.g., 10 kΩ) is placed between them to prevent bus conflict during the dummy zero preceding read operations. The Block Diagram and Section 2.2 explicitly warn that undefined voltage levels can occur without this resistor, especially when address bit A0 is high.
93LC46BT/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:
- 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-SOIC
93LC46BT/SN FAQ
1.How can I place an order for 93LC46BT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT/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 93LC46BT/SN reliable?
The price and inventory of 93LC46BT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46BT/SN is usually 5 days.
3.What payment methods are accepted for 93LC46BT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT/SN?
93LC46BT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT/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 93LC46BT/SN?
For technical support, including 93LC46BT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT/SN requirements.
6.How does Aetrix verify that 93LC46BT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46BT/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 93LC46BT/SN meets industry standards.
7.What is the process for return or replacement of 93LC46BT/SN?
All 93LC46BT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT/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 93LC46BT/SN part is unused and in its original packaging.
Return procedure for 93LC46BT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46BT/SN 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
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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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