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Microchip Technology 93AA46A-I/MS
- Part No.:
- 93AA46A-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93AA46A-I/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
93AA46A-I/MS from Microchip Technology is a 1 Kbit (128 × 8-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 erase-all-before-write-all (ERAL/WRAL), power-on/off data protection, and Ready/Busy status signaling via DO pin - deployed in embedded system configuration storage, sensor calibration memory, and power management register backup.
For engineers reviewing the 93AA46A-I/MS datasheet, 93AA46A-I/MS pinout, 93AA46A-I/MS application, or 93AA46A-I/MS equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), MSOP-8 package compatibility, 1 million erase/write endurance, >200-year data retention, and support for sequential read and high-Z output control during standby.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present (fixed x8 organization). Communication uses rising-edge clocking for instruction/address/data transfer, with DO providing both read data and Ready/Busy status polling during programming.
Internal logic enforces power-on write protection: device powers up in EWDS (Erase/Write Disable) mode, requiring explicit EWEN command before any ERASE or WRITE operation. All erase/write cycles are self-timed (6 ms typical for 93AA versions), and VCC brown-out detection triggers at 1.5 V to prevent corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit = 128 words × 8 bits - fixed x8 organization; no ORG pin; supports 128-byte configuration storage. |
| Supply Voltage | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no I²C or SPI protocol overhead. |
| Endurance | 1,000,000 erase/write cycles - sufficient for firmware parameter logging or frequent calibration updates over product lifetime. |
| Data Retention | >200 years at +25°C - ensures long-term reliability in unattended industrial or automotive applications. |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for use in motor controllers, HVAC systems, and industrial PLC modules. |
| Max Clock Freq | 3 MHz at VCC ≥ 4.5 V - supports fast configuration reads during boot; timing scales down to 1 MHz at 1.8 V for ultra-low-power operation. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad optional (not electrically connected).
| 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 (ICCS ≤ 5 µA). |
| 2 (CLK) | Serial Clock | Rising-edge synchronized timing for all data transfers; stoppable mid-sequence; no clock required during self-timed write. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; tied to DO only with series resistor to avoid bus conflict on dummy-zero read. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS goes low; requires TCSL ≥250 ns before status polling. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling during write cycles. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice - not used for ORG or other functions. |
| 7 (NC) | No Connection | Second NC pin in MSOP-8 variant; no internal bond wire; electrically isolated - no routing or termination required. |
| 8 (VCC) | Power Supply | 1.8–5.5 V input; includes on-chip voltage detect (VPOR = 1.5 V) to inhibit writes during power ramp-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | 6 ms typical cycle time (TWC) - eliminates external timing circuitry; no software delay loops needed for reliable programming. |
| Automatic ERAL before WRAL | Hardware-enforced erase-all prior to write-all - prevents partial writes and guarantees full-array consistency without host intervention. |
| Power-On/Off Data Protection | VCC brown-out detection at 1.5 V - blocks all write operations below threshold, eliminating risk of corrupted data during power instability. |
| Ready/Busy Status Signal | DO pin doubles as status indicator - enables non-blocking polling instead of fixed delays, improving system responsiveness and efficiency. |
| Sequential Read Mode | Continuous read across addresses while CS remains high - reduces transaction overhead for bulk configuration retrieval (e.g., 128-byte parameter set). |
Applications
| Industrial Sensor Calibration | Embedded System Configuration Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding 128 bytes of trim values; accessed once per power-up via Microwire interface. Use Value: Eliminates need for external trimming components; enables field recalibration with guaranteed 200-year data retention and 1M-cycle endurance. |
Use Scenario: Saving user-modifiable settings (display brightness, communication baud rate, alarm thresholds) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Serial EEPROM interfaced to MCU's GPIOs; stores persistent parameters updated infrequently but read at every boot. Use Value: Low 1.8 V operation allows direct connection to battery-backed MCU I/O; <5 µA standby current extends backup runtime. |
| Power Management Unit (PMU) Register Backup | Motor Control Firmware Parameter Storage |
|
Use Scenario: Retaining critical voltage/current limit registers and fault history logs in DC-DC controller ICs during power cycling. IC Role / Device Role / Timing Role: Standalone 1Kbit memory mapped to PMU's configuration bus; written only after validated safety checks. Use Value: Hardware write-protection (EWDS/EWEN) prevents accidental overwrites; 1.5 V VPOR ensures integrity during brown-out recovery. |
Use Scenario: Holding torque curve lookup tables and PID tuning constants for closed-loop servo drives in factory automation. IC Role / Device Role / Timing Role: External configuration memory accessed by motor control MCU during initialization and dynamic re-tuning. Use Value: Sequential read capability enables fast loading of 128-byte LUTs; MSOP-8 footprint minimizes PCB area in space-constrained drive modules. |
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/MS | Same 128×8 organization and MSOP-8 package, but 2.5–5.5 V VCC range - lacks 1.8 V operation. | Not suitable for 1.8 V systems; otherwise identical timing, instruction set, and endurance. | Select 93LC46A-I/MS only if system VCC never drops below 2.5 V and 1.8 V compatibility is unnecessary. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V, same 1 Kbit size; no Ready/Busy pin - relies on WIP flag polling via STATUS register. | Requires SPI peripheral instead of GPIO-bitbanged Microwire; different command structure and no hardware status pin. | Choose AT25010B-MAHL-T only when SPI is already implemented and GPIO count is constrained - not drop-in compatible. |
Compared with 93LC46A-I/MS, the 93AA46A-I/MS adds 1.8 V operation and identical industrial temp support; versus AT25010B-MAHL-T, it offers simpler 3-wire interface and dedicated Ready/Busy signaling but requires bit-banged Microwire rather than hardware SPI.
Availability
93AA46A-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and power management unit register backup requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA46A-I/MS 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, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving automotive, industrial, consumer, and communications markets.
The 93AA46A belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems requiring robust nonvolatile memory with minimal external components and wide voltage operation.
FAQ
What is the memory organization of the 93AA46A-I/MS?
The 93AA46A-I/MS has a fixed 128 × 8-bit (1 Kbit) organization with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support x16 configuration. This simplifies design by eliminating external ORG pin routing and logic, making it ideal for systems where 8-bit data alignment is standard.
Does the 93AA46A-I/MS require an external pull-up resistor on the DO pin?
No, the 93AA46A-I/MS does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when CS is low or during standby. A series resistor (e.g., 10 kΩ) is recommended only if DI and DO are shorted to prevent bus conflict during dummy-zero read cycles.
What is the minimum VCC required for reliable operation of the 93AA46A-I/MS?
The 93AA46A-I/MS requires VCC ≥ 1.8 V for full specification compliance, including read/write functionality and timing. Its internal voltage detector (VPOR) inhibits all write operations below ~1.5 V, ensuring data integrity during power ramp-up or brown-out conditions - a critical feature for systems with unstable supplies.
How is write protection implemented on the 93AA46A-I/MS?
The 93AA46A-I/MS powers up in Erase/Write Disable (EWDS) mode. An explicit EWEN command must be issued before any ERASE or WRITE instruction. After programming, issuing EWDS restores protection. This two-step hardware-enforced mechanism prevents accidental writes due to noise or firmware errors - no external lock bits or software flags required.
Can the 93AA46A-I/MS be used in place of the 93LC46A-I/MS?
Yes, the 93AA46A-I/MS is functionally and pin-compatible with the 93LC46A-I/MS in MSOP-8 packages, sharing identical pinout, instruction set, and x8 organization. The key difference is VCC range: 93AA46A-I/MS supports 1.8–5.5 V, while 93LC46A-I/MS requires ≥2.5 V. Use 93AA46A-I/MS for broader voltage flexibility.
93AA46A-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- 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-MSOP
93AA46A-I/MS FAQ
1.How can I place an order for 93AA46A-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46A-I/MS 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 93AA46A-I/MS reliable?
The price and inventory of 93AA46A-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA46A-I/MS is usually 5 days.
3.What payment methods are accepted for 93AA46A-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46A-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46A-I/MS?
93AA46A-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46A-I/MS 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 93AA46A-I/MS?
For technical support, including 93AA46A-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46A-I/MS requirements.
6.How does Aetrix verify that 93AA46A-I/MS is sourced from the original manufacturer or authorized distributors?
All 93AA46A-I/MS 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 93AA46A-I/MS meets industry standards.
7.What is the process for return or replacement of 93AA46A-I/MS?
All 93AA46A-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46A-I/MS, 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 93AA46A-I/MS part is unused and in its original packaging.
Return procedure for 93AA46A-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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