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Microchip Technology 93LC46BXT-I/SN
- Part No.:
- 93LC46BXT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46BXT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,276
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Product details
Overview
93LC46BXT-I/SN from Microchip Technology Inc. is a 1Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status signaling via DO pin, and >200-year data retention - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46BXT-I/SN datasheet, 93LC46BXT-I/SN pinout, 93LC46BXT-I/SN application, or 93LC46BXT-I/SN equivalent, key selection considerations include its fixed 16-bit organization (no ORG pin), SOIC-8 package compatibility, 3 MHz max clock frequency at VCC ≥ 4.5 V, and support for sequential read and WRAL/ERAL commands in resource-constrained designs.
Technical Context
The 93LC46BXT-I/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin (dedicated x16 mode). Communication uses rising-edge clocked opcodes (e.g., 01 for WRITE, 10 for READ) followed by 6-bit address and 16-bit data, requiring 25 clock cycles per READ/WRITE operation.
It integrates power-on/off data protection, automatic erase-before-write, and EWEN/EWDS lockout logic to prevent accidental writes. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator (low = busy) when polled after TCSL ≥ 250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits) - supports compact firmware parameter or calibration storage without external address latching. |
| VCC Range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic systems; POR threshold at 1.5 V prevents corruption during brown-out. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires only four GPIOs; no I²C pull-ups or SPI SS complexity. |
| Max Clock Frequency | 3 MHz (VCC ≥ 4.5 V), 2 MHz (2.5 V ≤ VCC < 4.5 V) - enables fast configuration load times while maintaining timing margin in noisy environments. |
| Write Endurance | 1,000,000 erase/write cycles - suitable for field-updatable settings with daily rewrites over 27 years. |
| Data Retention | Greater than 200 years at 25°C - ensures long-term reliability in unattended industrial deployments. |
| Temperature Range | –40°C to +85°C (Industrial grade) - validated for operation across full industrial ambient without derating. |
Pinout & Package
93LC46BXT-I/SN is packaged in an 8-lead SOIC (SN) with 150-mil body width and Pb-free Matte Tin finish. Pin 1 is marked by laser dot; package meets JEDEC MS-012AA standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICC ≤ 5 µA). |
| 2 (CLK) | Serial Clock | Rising-edge synchronized; accepts stopped clock; no cycles required during auto-erase/write; TCKH/TCKL minima vary with VCC. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; high-impedance when not selected; requires external pull-down on CS per datasheet guidance. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid only if CS reasserted after TCSL. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise coupling into serial interface. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice - no functional role. |
| 7 (NC) | No Connect | Same as Pin 6 - unused terminal; no routing or termination required. |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; includes internal voltage detect (VPOR = 1.5 V) for automatic write inhibition below safe operating level. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycle | 6 ms typical (TWC) - eliminates need for external timing control or software delay loops during programming. |
| Automatic ERAL before WRAL | Ensures full array erase prior to bulk write - prevents stale data remnants without host MCU intervention. |
| Ready/Busy polling via DO | Enables non-blocking firmware operation: MCU can execute other tasks while waiting for write completion. |
| EWEN/EWDS write protection | Hardware-enforced lockout - device powers up in EWDS state; explicit EWEN required before any erase/write. |
| Sequential read mode | Continuous data stream across addresses with single CS assertion - reduces transaction overhead for block reads. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in HVAC temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during MCU boot and runtime recalibration. Use Value: Enables field-replaceable sensor modules with persistent calibration; 1M endurance supports lifetime recalibration cycles. |
Use Scenario: Saving user preferences (e.g., cooking time, temperature, language) in microwave ovens and washing machines. IC Role / Device Role / Timing Role: Low-pin-count memory interfaced directly to 8-bit MCU GPIOs using minimal board space. Use Value: SOIC-8 footprint fits tight PCB layouts; 2.5 V min VCC allows direct connection to 3.3 V MCU I/O without level shifters. |
| Medical Device Settings Backup | Automotive Body Control Module (BCM) |
Use Scenario: Retaining alarm limits, display brightness, and audit log pointers in portable blood glucose meters. IC Role / Device Role / Timing Role: Secure, low-power storage for safety-critical parameters with >200-year data retention. Use Value: Eliminates battery-backed SRAM; RoHS-compliant and qualified for medical-grade thermal cycling (-40°C to +85°C). |
Use Scenario: Storing door lock/unlock patterns, mirror position presets, and lighting profiles in entry-level BCMs. IC Role / Device Role / Timing Role: Serial EEPROM co-located with MCU for infrequent but critical configuration updates. Use Value: WRAL command enables full profile reset in one transaction; 5.5 V max VCC tolerates automotive load-dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46A-I/SN | 64 × 8-bit organization (x8), same VCC range and package - lacks 16-bit data path. | Requires two-byte transfers for 16-bit values; increases firmware overhead and transaction count. | Select when legacy 8-bit bus alignment or existing x8 firmware stack simplifies integration. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, 20 MHz clock - different protocol and timing model. | Needs SPI peripheral instead of GPIO-bitbanged Microwire; higher speed but incompatible instruction set. | Choose for systems already using SPI peripherals and requiring faster random access than Microwire permits. |
Compared with 93LC46A-I/SN, the 93LC46BXT-I/SN delivers native 16-bit word handling for efficient parameter storage; versus AT25010B-MAHL-T, it offers simpler GPIO-driven interface at lower clock speeds - ideal for cost-sensitive, low-MIPS microcontrollers without dedicated SPI hardware.
Availability
93LC46BXT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, medical device settings backup, and automotive body control module applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC46BXT-I/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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC46BXT-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-pin-count, low-power nonvolatile storage in cost-sensitive embedded systems where simplicity and reliability outweigh high-speed requirements.
FAQ
What is the memory organization of the 93LC46BXT-I/SN?
The 93LC46BXT-I/SN has a fixed 64 × 16-bit (1 Kbit) organization - it is a 'B'-suffix device with no ORG pin. Unlike 'C' variants, it does not support dynamic x8/x16 switching; all read/write operations transfer 16 bits per address. This is confirmed in the Device Selection Table and Pin Function Table of DS20001749K.
Does the 93LC46BXT-I/SN require an external pull-up or pull-down resistor on any pin?
Yes - Microchip recommends a 10 kΩ external pull-down resistor on the CS pin for added protection against accidental writes during power-up or noise events. No pull-up is required on DO, as it actively drives high/low or enters High-Z; DI is CMOS input and may float if unused, but best practice ties unused inputs.
What is the maximum clock frequency supported by the 93LC46BXT-I/SN at 3.3 V supply?
At VCC = 3.3 V (within 2.5–4.5 V range), the 93LC46BXT-I/SN supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1, FCLK). Exceeding this violates AC timing - TCKH/TCKL minima increase to 250 ns/200 ns respectively, requiring careful MCU GPIO toggle timing.
How does the Ready/Busy status work on the 93LC46BXT-I/SN DO pin?
The DO pin outputs Ready/Busy status only when CS is brought high *after* being held low for ≥250 ns (TCSL). During erase/write, DO = low indicates busy; DO = high means complete. If CS remains low throughout, DO stays in High-Z - status polling requires deliberate CS toggling per Figure 2-1 and Section 2.4.
Is the 93LC46BXT-I/SN pin-compatible with other 93XX46 devices in SOIC-8 package?
Yes - all 93XX46A/B/C variants in SN (SOIC-8) share identical pinout: CS/CLK/DI/DO/VSS/NC/NC/VCC. However, 'A' and 'B' devices have NC on Pin 6 and 7, while 'C' devices use Pin 6 for ORG. Thus, 93LC46BXT-I/SN is mechanically and electrically pin-compatible with 93LC46A-I/SN and 93LC46C-I/SN in the same package, but functional behavior differs due to organization and ORG presence.
93LC46BXT-I/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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46BXT-I/SN FAQ
1.How can I place an order for 93LC46BXT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BXT-I/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 93LC46BXT-I/SN reliable?
The price and inventory of 93LC46BXT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46BXT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC46BXT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BXT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BXT-I/SN?
93LC46BXT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BXT-I/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 93LC46BXT-I/SN?
For technical support, including 93LC46BXT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BXT-I/SN requirements.
6.How does Aetrix verify that 93LC46BXT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46BXT-I/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 93LC46BXT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC46BXT-I/SN?
All 93LC46BXT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BXT-I/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 93LC46BXT-I/SN part is unused and in its original packaging.
Return procedure for 93LC46BXT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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