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Microchip Technology 93LC46B/W
- Part No.:
- 93LC46B/W
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
93LC46B/W.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE DIE
- Quantity:
- Payment:
- Shipping:
Inventory:3,635
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Product details
Overview
93LC46B/W from Microchip Technology Inc. is a 1Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status signaling via DO pin, and 1,000,000 endurance cycles - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46B/W datasheet, 93LC46B/W pinout, 93LC46B/W application, or 93LC46B/W equivalent, this page delivers verified electrical specs, package mapping to SOIC-8/W, functional timing behavior, real-world use scenarios in power management and sensor calibration, and two validated alternative parts with documented technical and application differences.
Technical Context
The 93LC46B/W implements a synchronous serial Microwire protocol with dedicated 16-bit organization - no ORG pin required. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are clocked in on CLK rising edges, with opcode/address/data validated per instruction set Table 1-3. The DO pin serves dual role: data output during READ and Ready/Busy status indicator during programming.
Power-on protection activates below 1.5V VCC; write operations require prior EWEN command and complete autonomously after CS fall (for 93LC variants). Timing parameters including TWC = 6 ms (erase/write), TEC = 6 ms (ERAL), and TWL = 15 ms (WRAL) are guaranteed across −40°C to +125°C at VCC ≥ 4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits) - fixed x16 organization enables compact 16-bit MCU interface without bit-packing overhead. |
| VCC Range | 2.5 V to 5.5 V - supports direct connection to 3.3V and 5V logic domains without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - ensures reliable field updates over product lifetime in firmware parameter storage. |
| Data Retention | 200 years at +25°C - guarantees nonvolatile storage integrity across extended shelf life and operational lifespan. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no I²C pull-ups or SPI SS complexity. |
| Access Time | TPD ≤ 400 ns (CL = 100 pF, VCC ≥ 1.8V) - enables high-speed reads in time-critical boot or calibration sequences. |
| Operating Temp | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and industrial control environments. |
Pinout & Package
93LC46B/W is packaged in 8-lead SOIC (SOIC-8, package code SN), with Pb-free Matte Tin finish and standard 150-mil body width. Pin 1 marked by laser dot or notch; pin 1 location confirmed per Microchip DS20001749K-page 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed programming on falling edge. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clocks required during auto-erase/write cycle. |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied to DO only with series resistor to prevent bus conflict. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; status valid only if CS re-asserted after TCSL. |
| VSS | Ground | Reference for all digital and analog circuitry; must be low-impedance connection to avoid timing skew. |
| NC | No Connect | Pin 7 in SOIC-8 - internally unconnected; must remain floating or grounded per layout best practice. |
| VCC | Power Supply | 2.5–5.5V supply; POR threshold at 1.5V; ≥4.5V required for ERAL and WRAL operations. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control - internal state machine completes 6 ms TWC cycle autonomously after CS fall. |
| Auto-ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data corruption without software intervention. |
| Ready/Busy Status via DO | Enables polling-based flow control instead of fixed delays - reduces worst-case wait time in firmware drivers. |
| Power-On/Off Data Protection | Hardware lockout below 1.5V VCC prevents partial writes during brown-out or power ramp - no software safeguards needed. |
| EWEN/EWDS Command Lock | Explicit enable/disable sequence prevents accidental writes - device powers up in EWDS (write-disabled) state. |
Applications
| Industrial Sensor Calibration | Automotive Power Module Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during system boot and recalibration routines. Use Value: Enables field-upgradable calibration without firmware reflashing; 200-year retention ensures accuracy across equipment lifecycle. |
Use Scenario: Holding startup voltage thresholds and fault recovery settings in DC-DC controllers for EV battery management systems. IC Role / Device Role / Timing Role: Critical safety parameter store accessed at power-on reset and during thermal derating events. Use Value: −40°C to +125°C operation and 1M-cycle endurance support repeated reconfiguration in harsh automotive environments. |
| Medical Device Parameter Archiving | Consumer Appliance User Preference Storage |
|
Use Scenario: Recording last-used therapy settings and usage logs in portable infusion pumps compliant with IEC 62304. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for audit-trail data and regulatory-required operational history. Use Value: RoHS-compliant Pb-free packaging and 2.5V minimum VCC allow integration into low-power, battery-operated medical designs. |
Use Scenario: Saving user-selected wash cycles, temperature presets, and display brightness in smart washing machines. IC Role / Device Role / Timing Role: Persistent settings store updated during UI interaction and retained across AC power loss. Use Value: Microwire interface minimizes MCU GPIO count; 64×16-bit layout matches common 16-bit configuration word size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-I/SN | Same die, identical 64×16-bit organization and SOIC-8 package; differs only in marking (T = tape-and-reel, I = industrial temp). | Identical functional use; selected when reel packaging required for SMT production. | Drop-in replacement for 93LC46B/W in automated assembly - same footprint, timing, and command set. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5V, 20 MHz max clock - no Ready/Busy pin; uses WIP flag in status register. | Requires SPI peripheral instead of generic GPIO bit-banging; lacks hardware status polling - needs status register reads. | Choose when existing design uses SPI peripherals and higher throughput (20 MHz vs. 3 MHz Microwire) is prioritized over pin count. |
Compared with 93LC46B/W, 93LC46BT-I/SN offers identical functionality in tape-and-reel form factor for volume manufacturing, while AT25010B-SSHL-T trades 3-wire simplicity for faster SPI throughput and broader VCC range but requires additional software overhead for status checking.
Availability
93LC46B/W is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive power module configuration, and medical device parameter archiving requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 93LC46B/W 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/W belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems requiring robust nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC46B/W?
The 93LC46B/W has a fixed 64-word × 16-bit (1Kbit) organization - it is a 'B' variant, meaning no ORG pin is present and word size is permanently configured for 16-bit access. This eliminates external configuration logic and simplifies interface timing versus 'C' variants with selectable organization.
Does the 93LC46B/W require an external pull-up resistor on the DO pin?
No - the 93LC46B/W DO pin has an active push-pull driver for Read mode and Ready/Busy status. Pull-ups are unnecessary and may interfere with correct status interpretation. A series resistor (e.g., 10 kΩ) is recommended only if DI and DO are shorted on-board to prevent bus conflict during dummy-zero phase.
What is the minimum VCC required for ERAL and WRAL operations on the 93LC46B/W?
The 93LC46B/W requires VCC ≥ 4.5V for proper execution of ERAL (Erase All) and WRAL (Write All) commands, as specified in DS20001749K-page 8 and page 11. Below 4.5V, these commands will not initiate or may result in incomplete array erasure.
How does the 93LC46B/W indicate Ready/Busy status during a write cycle?
The 93LC46B/W asserts Ready/Busy status on the DO pin: DO = low indicates programming is in progress; DO = high means the operation completed successfully. To read status, CS must be brought high for ≥250 ns after the initial CS low pulse - DO enters High-Z if CS remains low throughout the cycle.
Is the 93LC46B/W pin-compatible with the 93LC46A/W?
No - although both share the same SOIC-8 package and pinout, the 93LC46B/W (64×16-bit) and 93LC46A/W (128×8-bit) differ in memory organization and instruction timing. Using them interchangeably would cause address misalignment and data corruption; firmware and hardware design must match the specific variant.
93LC46B/W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
93LC46B/W FAQ
1.How can I place an order for 93LC46B/W through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46B/W 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 93LC46B/W reliable?
The price and inventory of 93LC46B/W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46B/W is usually 5 days.
3.What payment methods are accepted for 93LC46B/W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46B/W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46B/W?
93LC46B/W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46B/W 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 93LC46B/W?
For technical support, including 93LC46B/W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46B/W requirements.
6.How does Aetrix verify that 93LC46B/W is sourced from the original manufacturer or authorized distributors?
All 93LC46B/W 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 93LC46B/W meets industry standards.
7.What is the process for return or replacement of 93LC46B/W?
All 93LC46B/W units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46B/W, 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 93LC46B/W part is unused and in its original packaging.
Return procedure for 93LC46B/W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46B/W Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
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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