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Microchip Technology 93AA46BT-I/MC
- Part No.:
- 93AA46BT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93AA46BT-I/MC.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
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Product details
Overview
93AA46BT-I/MC from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and 1 million erase/write cycles. It operates without an ORG pin and is used for configuration storage in microcontroller-based embedded systems requiring nonvolatile memory with fast write enable/disable control.
For engineers reviewing the 93AA46BT-I/MC datasheet, 93AA46BT-I/MC pinout, 93AA46BT-I/MC application, or 93AA46BT-I/MC equivalent, this page delivers verified electrical specs, package mapping to 8-lead 2×3 DFN, functional timing behavior, real-world use cases in power management and sensor calibration, and two validated alternative parts with documented differences.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO signals with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all self-timed with Ready/Busy status signaled via DO pin after minimum TCSL (250 ns).
It features automatic erase-before-write, power-on/off data protection, and voltage-detect circuitry (VPOR = 1.5 V typical). The absence of ORG pin confirms fixed 8-bit organization, and its DFN package (MC) uses exposed pad optionally connected to VSS for thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - provides compact nonvolatile storage for boot parameters or calibration data in space-constrained designs. |
| VCC range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V logic domains without level-shifting. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - simplifies host MCU GPIO usage and reduces PCB routing complexity. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable firmware or runtime configuration logging. |
| Data retention | >200 years at +25°C - guarantees data integrity across product lifetime without refresh mechanisms. |
| Write cycle time | 6 ms (TWC) - defines worst-case latency for single-byte or full-array programming operations. |
| Standby current | 1 µA (ICCS, I-temp) - minimizes quiescent power draw in battery-powered or always-on applications. |
Pinout & Package
Package: 8-lead 2×3 mm DFN (exposed pad), Pb-free Matte Tin finish, RoHS compliant. Pin 1 marked by laser dot; exposed pad may be connected to VSS for improved thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable signal; must remain low ≥250 ns between commands; initiates self-timed write on falling edge for 93AA versions. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-sequence without error. |
| 3 (DI) | Data Input | Accepts start bit, instruction opcodes, address bits, and write data; requires stable setup/hold timing relative to CLK. |
| 4 (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. |
| 5 (NC) | No internal connection | Unbonded pin; must be left floating or tied to ground per layout best practice - no functional role. |
| 6 (ORG) | Memory Configuration | Not present on 93AA46B/T variants - pin is NC; fixed 16-bit organization confirmed by part number suffix 'B'. |
| 7 (VSS) | Ground | Reference node for all digital and analog circuitry; connects to exposed pad in DFN package for thermal path. |
| 8 (VCC) | Power Supply | Supplies core logic and memory array; includes internal voltage detect (VPOR = 1.5 V) for automatic write inhibition below threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - host MCU only monitors DO pin for completion confirmation. |
| Automatic ERAL before WRAL | Ensures clean memory state prior to full-array write, preventing partial writes or data corruption without software intervention. |
| EWEN/EWDS security protocol | Requires explicit enable before any erase/write; disables all programming after each operation unless re-enabled - prevents accidental overwrites. |
| Ready/Busy status on DO | Enables polling-based flow control instead of fixed delays, optimizing system response time and reducing CPU overhead. |
| Low-power standby mode | Draws only 1 µA when CS is low - critical for energy-sensitive applications like IoT sensors and portable medical devices. |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Storing tariff tables, meter calibration coefficients, and tamper-event logs across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via MCU SPI-like Microwire interface during initialization and periodic updates. Use Value: 1.8–5.5 V operation allows direct integration with meter's 3.3 V supply rail; 1M endurance supports daily firmware patching over 27 years. |
Use Scenario: Retaining module identification, channel scaling factors, and fault history in distributed I/O nodes. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent parameter storage independent of main controller reboot or firmware reload. Use Value: Industrial temp range (–40°C to +85°C) ensures reliable operation in uncontrolled cabinet environments; DFN package saves board space in dense backplane designs. |
| Medical Infusion Pumps | Automotive Body Control Modules |
|
Use Scenario: Saving drug library metadata, dose limits, and user audit trails with regulatory-grade data integrity. IC Role / Device Role / Timing Role: Safety-critical configuration memory accessed during boot and runtime diagnostics via deterministic timing interface. Use Value: >200-year data retention meets FDA long-term recordkeeping requirements; RoHS compliance supports global device certification. |
Use Scenario: Storing seat position presets, mirror calibration offsets, and lighting configuration profiles. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced to 3.3 V CAN microcontroller for infrequent but persistent settings storage. Use Value: 1.8 V minimum VCC enables operation during cold-cranking conditions; 1 µA standby current minimizes battery drain in parked vehicle state. |
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/MC | VCC range 2.5–5.5 V (vs. 1.8–5.5 V); identical pinout, timing, and instruction set. | Not suitable for 1.8 V systems; otherwise drop-in compatible in 3.3 V/5 V designs with same temperature grade and DFN package. | Select if design uses ≥2.5 V supply and requires Microchip's extended qualification for automotive-adjacent industrial use. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V, 1 Kbit, 1M endurance; different command structure and no ORG pin. | Requires host SPI peripheral instead of Microwire emulation; lacks ERAL/WRAL atomic operations; no EWEN/EWDS lockout. | Choose when migrating to standard SPI infrastructure or when needing faster clock rates (up to 20 MHz vs. 3 MHz max for 93AA46B). |
Compared with 93LC46BT-I/MC, the 93AA46BT-I/MC supports lower-voltage operation critical for modern ultra-low-power systems, while the AT25010B-MAHL-T offers higher-speed SPI compatibility at the cost of losing Microwire-specific features like hardware write disable and atomic bulk operations.
Availability
93AA46BT-I/MC is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, medical infusion pumps, and automotive body control modules requiring stable component supply across multi-year production lifecycles.
Supply support for 93AA46BT-I/MC 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 93XX46 family was designed specifically for low-power, nonvolatile memory applications in embedded systems where small footprint, wide voltage range, and robust data integrity are essential - especially in industrial and medical equipment.
FAQ
What is the memory organization of the 93AA46BT-I/MC?
The 93AA46BT-I/MC is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - confirming dedicated 8-bit organization. This differs from 'C' variants that use the ORG pin to select between 8-bit and 16-bit modes, and from 'B' variants which are 64 × 16-bit. The 'A' suffix in 93AA46BT-I/MC explicitly denotes the x8 configuration.
Does the 93AA46BT-I/MC require external pull-up resistors on its I/O lines?
The 93AA46BT-I/MC does not require external pull-ups on CS, CLK, or DI - these inputs have internal weak pull-downs. However, DO is open-drain and requires an external pull-up resistor (typically 4.7 kΩ to VCC) to ensure valid logic-high levels during Read and Ready/Busy status reporting. This is explicitly required per Section 2.2 of the datasheet to avoid bus conflicts.
How is write protection implemented in the 93AA46BT-I/MC?
Write protection in the 93AA46BT-I/MC is enforced through dual mechanisms: (1) hardware voltage detection (VPOR = 1.5 V) inhibits all writes when VCC drops below threshold, and (2) software-controlled EWEN/EWDS commands - the device powers up in EWDS (disabled) mode and requires an explicit EWEN instruction before any ERASE or WRITE can execute. This prevents accidental overwrites during power transients or firmware bugs.
What is the maximum clock frequency supported by the 93AA46BT-I/MC?
The 93AA46BT-I/MC supports a maximum clock frequency of 3 MHz when VCC ≥ 4.5 V. At lower voltages - specifically 2.5 V ≤ VCC < 4.5 V - the maximum clock rate drops to 2 MHz, and for 1.8 V ≤ VCC < 2.5 V, it is limited to 1 MHz. These values are specified in Table 1-2 (A1) and apply across the full industrial temperature range (–40°C to +85°C).
Can the 93AA46BT-I/MC be used in place of the 93AA46AT-I/MC?
No - the 93AA46BT-I/MC and 93AA46AT-I/MC are not interchangeable. The 'B' suffix indicates 64 × 16-bit (1 Kbit) organization, while the 'A' suffix denotes 128 × 8-bit (also 1 Kbit). Though both share the same VCC range, package, and temperature grade, their address widths, data widths, and instruction timing differ: 93AA46AT-I/MC requires 7 address bits and outputs 8 data bits per READ, whereas 93AA46BT-I/MC uses 6 address bits and outputs 16 bits - requiring host firmware changes.
93AA46BT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
93AA46BT-I/MC FAQ
1.How can I place an order for 93AA46BT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46BT-I/MC 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 93AA46BT-I/MC reliable?
The price and inventory of 93AA46BT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA46BT-I/MC is usually 5 days.
3.What payment methods are accepted for 93AA46BT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46BT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46BT-I/MC?
93AA46BT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46BT-I/MC 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 93AA46BT-I/MC?
For technical support, including 93AA46BT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46BT-I/MC requirements.
6.How does Aetrix verify that 93AA46BT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93AA46BT-I/MC 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 93AA46BT-I/MC meets industry standards.
7.What is the process for return or replacement of 93AA46BT-I/MC?
All 93AA46BT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46BT-I/MC, 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 93AA46BT-I/MC part is unused and in its original packaging.
Return procedure for 93AA46BT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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