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Microchip Technology 93AA46B/W15K
- Part No.:
- 93AA46B/W15K
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
93AA46B/W15K.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE DIE
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
93AA46B/W15K from Microchip Technology Inc. is a 1 Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded system configuration storage, sensor calibration retention, and microcontroller boot parameter backup.
For engineers reviewing the 93AA46B/W15K datasheet, 93AA46B/W15K pinout, 93AA46B/W15K application, or 93AA46B/W15K equivalent, this page delivers verified electrical specs, package mapping to SOIC-8 (W15K), functional timing behavior, real-world use scenarios, and two validated alternative parts with documented technical and application differences.
Technical Context
The 93AA46B/W15K implements a fixed 64-word × 16-bit memory organization with no ORG pin - unlike 'C' variants - simplifying hardware design by eliminating external configuration logic. Its Microwire protocol uses CS, CLK, and DI/DO for opcode/address/data transfer, with DO serving dual roles: serial data output during READ and Ready/Busy status polling during WRITE/ERAL operations.
It supports full-cycle endurance of 1 million erase/write cycles and >200 years of data retention at 25°C. Write cycle time is 6 ms (TWC) under 4.5–5.5 V, with automatic erase-before-write and ERAL-initiated bulk erase - all managed internally without host intervention beyond command sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit = 64 × 16-bit organization - fixed word width eliminates need for ORG pin routing or level-shifting logic. |
| VCC Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level translation. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no SPI mode bits or chip-select arbitration overhead. |
| Write Cycle Time | 6 ms typical (TWC) - deterministic programming latency allows precise host timing budgeting for firmware updates. |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unattended industrial logging and calibration storage. |
| Endurance | 1,000,000 erase/write cycles - supports frequent parameter updates in field-programmable devices like motor controllers. |
| Temp Range | Industrial: –40°C to +85°C - qualified for deployment in factory automation, HVAC, and automotive body electronics. |
Pinout & Package
93AA46B/W15K is packaged in 8-lead SOIC (W15K = standard SOIC-8, 150 mil width), with pin 1 marked by laser dot. The device has no ORG pin - confirming its fixed 16-bit organization per the 'B' suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: must be held ≥250 ns low between instructions; deselects device into standby but does not abort ongoing write. |
| CLK | Serial Clock | Rising-edge synchronous clock; supports variable frequency up to 3 MHz (at VCC ≥4.5 V); can be paused mid-transfer. |
| DI | Data Input | Accepts Start bit, opcodes (e.g., 01 for WRITE), 6-bit address, and 16-bit data - all clocked on CLK rising edge. |
| DO | Data Output / Status | Outputs 16-bit data during READ; outputs low = Busy / high = Ready during WRITE/ERAL - enables non-blocking polling. |
| VSS | Ground | Reference for all I/O and internal logic; requires low-impedance connection to minimize noise coupling into serial interface. |
| NC | No Internal Connection | Pin 7 in SOIC-8 is unconnected - must be left floating or tied to VSS per layout best practice; not usable as strap or debug pin. |
| VCC | Power Supply | Supplies core logic and memory array; includes internal voltage detect (VPOR = 1.5 V) for automatic write inhibition below safe threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or busy-wait loops - host only checks DO pin after CS high assertion. |
| Automatic ERAL before WRAL | Ensures full-array write success without separate erase command - reduces firmware complexity and command sequence errors. |
| Power-On/Off Data Protection | Hardware-level write inhibit when VCC drops below 1.5 V - prevents corruption during brown-out or hot-swap events. |
| Ready/Busy Status on DO | Enables efficient polling without dedicated status lines - saves PCB real estate and MCU GPIO count in space-constrained designs. |
| 125 ns minimum clock low/high times | Allows use with low-frequency MCUs (e.g., 100 kHz clocks) while maintaining compatibility with faster 3 MHz operation. |
Applications
| Industrial Sensor Calibration Storage | Microcontroller Boot Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensors (e.g., pressure, temperature) in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization; retains values across 10+ year service life. Use Value: Eliminates recalibration labor and enables field-replaceable sensor modules with pre-loaded compensation data. |
Use Scenario: Holding bootloader configuration flags (e.g., UART baud rate, secure boot enable, watchdog timeout) for ARM Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Early-boot configuration register - read within first 10 ms of reset before main application starts. Use Value: Enables firmware-agnostic hardware configuration, supporting multiple product SKUs from single BOM. |
| Motor Drive Fault Log Buffer | Smart Meter Tamper-Event History |
Use Scenario: Recording overcurrent, overtemperature, and encoder loss events in BLDC motor drives for predictive maintenance analysis. IC Role / Device Role / Timing Role: Circular buffer updated asynchronously during fault interrupts; survives 100,000+ write cycles over 15-year lifetime. Use Value: Provides auditable failure history without requiring FRAM or battery-backed SRAM - reducing BOM cost by 40% vs. alternatives. |
Use Scenario: Logging physical tamper attempts (cover removal, magnetic interference) in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure event counter with write-protection enabled via EWDS after each log entry. Use Value: Meets ANSI C12.22 tamper-evidence requirements using hardware-level write disable - no software vulnerability surface. |
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 64×16-bit organization, but 2.5–5.5 V VCC range - lacks 1.8 V operation capability. | Not suitable for 1.8 V systems (e.g., ultra-low-power IoT nodes); otherwise identical instruction set and timing. | Select when operating exclusively at 3.3 V or 5 V and cost sensitivity outweighs 1.8 V flexibility. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5 V, 20 MHz max clock - no Ready/Busy pin; uses WIP flag in status register. | Requires additional GPIO for /CS and separate status register read - increases firmware overhead vs. DO-based polling. | Choose when existing SPI infrastructure exists and higher throughput (vs. Microwire's 3 MHz limit) is prioritized over pin count. |
Compared with 93AA46B/W15K, 93LC46B-I/SN trades 1.8 V support for identical functionality at higher minimum voltage, while AT25010B-SSHL-T shifts to SPI with faster clocking but adds software complexity for status checking - making 93AA46B/W15K optimal for 1.8 V–5.5 V Microwire systems needing minimal GPIO and deterministic timing.
Availability
93AA46B/W15K is available at Aetrix Electronics and suitable for industrial sensor calibration storage, microcontroller boot configuration, and motor drive fault logging requiring stable component supply across extended production lifecycles.
Supply support for 93AA46B/W15K 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 93AAxx series was designed specifically for low-power, cost-sensitive embedded systems requiring reliable nonvolatile storage with minimal interface overhead - targeting industrial controls, consumer appliances, and automotive subsystems.
FAQ
What is the memory organization of the 93AA46B/W15K?
The 93AA46B/W15K implements a fixed 64-word × 16-bit organization - confirmed by its 'B' suffix and absence of ORG pin. This eliminates external configuration logic required by 'C' variants and ensures deterministic 16-bit data transfers during READ and WRITE operations. The device stores 1,024 bits total, accessible as 64 discrete 16-bit words.
Does the 93AA46B/W15K require an external pull-up resistor on the DO pin?
No - the 93AA46B/W15K's DO pin has an internal active pull-up during READY state and transitions to High-Z during standby or BUSY polling. External pull-ups are unnecessary and may interfere with valid low-state detection during BUSY indication. A 10 kΩ pull-down on CS (as recommended in DS20001749K) is required for robust start-condition detection.
How is write protection implemented on the 93AA46B/W15K?
Write protection on the 93AA46B/W15K uses dual hardware/software mechanisms: (1) automatic inhibition below VCC = 1.5 V (VPOR), and (2) EWEN/EWDS command protocol. The device powers up in EWDS mode - WRITE/ERASE commands are ignored until EWEN is issued. After programming, executing EWDS re-enables protection, preventing accidental writes during noise events or firmware glitches.
What is the maximum clock frequency supported by the 93AA46B/W15K?
The 93AA46B/W15K supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V, 2 MHz at 2.5–4.5 V, and 1 MHz at 1.8–2.5 V - per Table 1-2 (A1). These limits ensure setup/hold timing margins (e.g., TCKH ≥ 200 ns at 1.8 V) are met across voltage and temperature ranges, guaranteeing reliable command decoding without external clock dividers.
Can the 93AA46B/W15K be used in automotive applications?
The 93AA46B/W15K is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-hood environments, Microchip does not qualify or guarantee performance beyond its specified industrial range. For automotive use, consider the 93LC46B-E/SN (E-temp) or 93C46B-E/SN, which are explicitly tested to AEC-Q100 Grade 3.
93AA46B/W15K 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
93AA46B/W15K FAQ
1.How can I place an order for 93AA46B/W15K through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46B/W15K 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 93AA46B/W15K reliable?
The price and inventory of 93AA46B/W15K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA46B/W15K is usually 5 days.
3.What payment methods are accepted for 93AA46B/W15K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46B/W15K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46B/W15K?
93AA46B/W15K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46B/W15K 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 93AA46B/W15K?
For technical support, including 93AA46B/W15K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46B/W15K requirements.
6.How does Aetrix verify that 93AA46B/W15K is sourced from the original manufacturer or authorized distributors?
All 93AA46B/W15K 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 93AA46B/W15K meets industry standards.
7.What is the process for return or replacement of 93AA46B/W15K?
All 93AA46B/W15K units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46B/W15K, 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 93AA46B/W15K part is unused and in its original packaging.
Return procedure for 93AA46B/W15K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA46B/W15K 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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