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Microchip Technology 93LC46BT-I/SN
- Part No.:
- 93LC46BT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46BT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:22,215
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Product details
Overview
93LC46BT-I/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for industrial temperature range (–40°C to +85°C), and housed in an 8-lead SOIC package (SN). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46BT-I/SN datasheet, 93LC46BT-I/SN pinout, 93LC46BT-I/SN application, or 93LC46BT-I/SN equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), 8-bit fixed organization (no ORG pin), industrial-grade temperature support, SOIC-8 packaging, and Microwire protocol timing compliance at up to 3 MHz.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin (as confirmed by 'A' suffix designation and Device Selection Table). All operations are initiated by a Start bit (CS high + DI high on CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges.
It uses internal auto-erase-before-write logic and supports ERAL (Erase All) and WRAL (Write All) commands with dedicated timing (6 ms TWC for erase/write, 6 ms TEC for ERAL, 15 ms TWL for WRAL). Data retention exceeds 200 years, and endurance is rated at 1 million erase/write cycles at 25°C and VCC = 5.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit organization; fixed, no ORG pin) |
| VCC Range | 2.5V to 5.5V - supports wide supply rails including 3.3V and 5V systems |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no I²C or SPI protocol |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5V - defines maximum instruction throughput and timing margin |
| Write Cycle Time | 6 ms typical (TWC) - determines minimum time between write operations |
| Data Retention | >200 years - ensures long-term nonvolatile storage without refresh |
| Endurance | 1,000,000 erase/write cycles - specifies usable lifetime under repeated reprogramming |
Pinout & Package
8-lead SOIC package (SN), RoHS-compliant, Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 ID corner indicated on top marking.
| 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 |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Receives Start bit, opcodes, addresses, and write data; shares bus with DO only with external current-limiting resistor |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or during non-read states |
| 5 (VSS) | Ground | Reference return path for all signals and power; must be low-impedance connection |
| 6 (NC) | No Internal Connection | Unbonded pad; must be left floating or tied to VSS per layout best practice - not connected to ORG |
| 7 (NC) | No Internal Connection | Unbonded pad; identical to Pin 6 - no functional role in 93LC46A/B variants |
| 8 (VCC) | Power Supply | Primary supply rail; internal POR circuit triggers at ~1.5V; requires stable decoupling near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - internal logic manages full auto-erase-and-program sequence |
| Automatic ERAL before WRAL | Ensures memory array is fully erased prior to bulk write, preventing data corruption without host intervention |
| Power-on/off data protection | Hardware-level VCC monitoring disables writes below ~1.5V - prevents partial writes during brown-out |
| Ready/Busy status on DO pin | Enables polling-based operation without fixed delays - reduces system latency versus worst-case timeout waits |
| Sequential read mode | Allows continuous address increment with CS held high - simplifies firmware for block reads (e.g., config tables) |
Applications
| Industrial Sensor Calibration Storage | Consumer Appliance Configuration Memory |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in HVAC controllers or pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during startup or field calibration. Use Value: Maintains accuracy across power cycles and 200+ year data retention eliminates recalibration schedules. |
Use Scenario: Saving user preferences (e.g., display brightness, timer settings) in microwave ovens or washing machines. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM interfaced directly to MCU GPIOs using Microwire protocol. Use Value: 1M endurance supports daily setting changes over 10+ years of product lifetime. |
| Medical Device Parameter Backup | Automotive Body Control Module Settings |
|
Use Scenario: Backing up therapy parameters (e.g., infusion rate, alarm thresholds) in portable insulin pumps. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory with hardware write-protection (EWDS/EWEN) and VCC lockout. Use Value: Power-on data protection prevents corruption during battery insertion or voltage ramp-up. |
Use Scenario: Storing seat/mirror position presets and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Industrial-temp-rated EEPROM interfaced to 3.3V microcontrollers in cabin electronics. Use Value: –40°C to +85°C rating ensures reliable operation across vehicle thermal environments. |
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 | 16-bit organization (64 × 16), same VCC range and package - requires different address/data framing | Used where wider word access improves MCU efficiency (e.g., 16-bit MCU peripherals) | Select only if system firmware supports x16 addressing and data packing; not drop-in compatible |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5V, SOIC-8 - different protocol and command set | Preferred in SPI-native designs; lacks ERAL/WRAL but offers faster max clock (20 MHz) | Requires protocol stack rewrite; suitable when higher throughput or broader voltage support is prioritized |
Compared with 93LC46B-I/SN, the 93LC46BT-I/SN provides native 8-bit framing without software bit-packing; compared with AT25010B-SSHL-T, it retains Microwire compatibility and integrated ERAL/WRAL but trades lower max speed for simpler timing and legacy ecosystem alignment.
Availability
93LC46BT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device parameter backup requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC46BT-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 microcontrollers, analog devices, 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 embedded systems requiring simple 3-wire nonvolatile storage with robust data integrity and industrial temperature operation.
FAQ
What is the memory organization of the 93LC46BT-I/SN?
The 93LC46BT-I/SN is a fixed 128 × 8-bit (1 Kbit) organization device - designated by the 'A' suffix in the family naming convention. It has no ORG pin; therefore, word size is permanently set to 8 bits, eliminating configuration dependency and simplifying interface logic compared to 'C' variants.
Does the 93LC46BT-I/SN support the ERAL (Erase All) command?
Yes, the 93LC46BT-I/SN supports the ERAL command (opcode 0010xxxx), which erases the entire memory array to logical '1'. Execution requires VCC ≥ 4.5V and prior execution of EWEN; the cycle completes in 6 ms (TEC) and is self-timed - no external delay needed.
What is the purpose of the NC pins on the 93LC46BT-I/SN SOIC package?
Pins 6 and 7 on the 93LC46BT-I/SN are No Connect (NC) terminals - physically present but internally unconnected. They must not be used as grounds or signals. Per Microchip recommendations, they may be left floating or tied to VSS for mechanical stability, but no electrical function is assigned.
How does the Ready/Busy status work on the 93LC46BT-I/SN DO pin?
The DO pin outputs Ready/Busy status during erase/write operations: logic low indicates ongoing programming; logic high means completion. To read status, CS must be brought high for ≥250 ns after TCSL, then sampled - DO returns to High-Z when CS goes low again.
Is the 93LC46BT-I/SN compatible with 3.3V microcontrollers?
Yes, the 93LC46BT-I/SN operates from 2.5V to 5.5V and meets Microwire timing requirements at 3.3V (e.g., FCLK ≤ 2 MHz, TCKH/TCKL ≥ 250 ns). Its VIH1 threshold (2.0V min) and VOL1 (≤0.4V at 2.1 mA) ensure reliable interfacing with standard 3.3V CMOS logic levels.
93LC46BT-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
93LC46BT-I/SN FAQ
1.How can I place an order for 93LC46BT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT-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 93LC46BT-I/SN reliable?
The price and inventory of 93LC46BT-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 93LC46BT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC46BT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT-I/SN?
93LC46BT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT-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 93LC46BT-I/SN?
For technical support, including 93LC46BT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT-I/SN requirements.
6.How does Aetrix verify that 93LC46BT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46BT-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 93LC46BT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC46BT-I/SN?
All 93LC46BT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT-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 93LC46BT-I/SN part is unused and in its original packaging.
Return procedure for 93LC46BT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46BT-I/SN 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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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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