My Inquiry
My Account
Microchip Technology 93LC46AT-I/MS
- Part No.:
- 93LC46AT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC46AT-I/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,691
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93LC46AT-I/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating across 2.5–5.5 V supply, rated for Industrial temperature (−40°C to +85°C), and housed in an 8-lead MSOP package. 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 93LC46AT-I/MS datasheet, 93LC46AT-I/MS pinout, 93LC46AT-I/MS application, or 93LC46AT-I/MS equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), MSOP footprint compatibility, 6 ms typical write cycle time, 1 million endurance cycles, and support for sequential read and hardware-level data protection without external circuitry.
Technical Context
The 93LC46AT-I/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed x8 organization. Communication uses rising-edge clocking for instruction/address/data input and output, with DO providing both data output and Ready/Busy status polling during programming.
Its internal architecture includes auto-erase-before-write logic, EWEN/EWDS command-based write enable/disable control, and on-chip voltage detection (VPOR = 1.5 V typical) that inhibits all operations below threshold - ensuring data integrity during brown-out conditions in battery-powered or low-voltage industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit); provides compact nonvolatile storage for calibration data, device IDs, or small firmware patches. |
| VCC range | 2.5 V to 5.5 V; supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Write cycle time | 6 ms typical (TWC); enables predictable timing budgeting for firmware updates without blocking main CPU execution. |
| Endurance | 1,000,000 erase/write cycles; suitable for applications requiring frequent parameter logging or field-updatable settings. |
| Data retention | 200 years at +25°C; guarantees long-term reliability in unattended industrial equipment or infrastructure nodes. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); minimal GPIO usage and proven interoperability with legacy MCU peripherals. |
| Temp grade | Industrial (−40°C to +85°C); validated for deployment in factory automation, motor drives, and outdoor sensor nodes. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICC ≤ 5 µA). |
| CLK | Serial Clock | Rising-edge synchronized I/O; supports up to 3 MHz (VCC ≥ 4.5 V); clock can pause mid-transfer without corruption. |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; shares no internal conflict with DO in standard operation. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read states. |
| VSS | Ground | Reference for all I/O and internal logic; tied to exposed pad in MSOP for thermal and noise performance. |
| NC | No Connect | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice. |
| VCC | Power Supply | Supplies core logic and memory array; includes built-in POR circuit triggering at ~1.5 V to block unsafe writes. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delays - write completion signaled via DO pin polling. |
| Automatic ERAL before WRAL | Ensures full-array write consistency without separate erase command, reducing firmware complexity and error risk. |
| Power-on/off data protection | Hardware-enforced lockout below VPOR (~1.5 V) prevents partial writes during power ramp-up/down or brownouts. |
| EWEN/EWDS command security | Write-enable state persists only after explicit EWEN; accidental writes are blocked unless enabled - critical for field-deployed devices. |
| Sequential read mode | Enables continuous address increment with single CS assertion, reducing transaction overhead for bulk data reads. |
Applications
| Motor Control Configuration | Smart Sensor Calibration Storage |
|---|---|
Use Scenario: Storing PID coefficients, current limits, and commutation tables in BLDC motor drivers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at startup and during field service. Use Value: Enables plug-and-play motor replacement and runtime tuning without reprogramming MCU flash. | Use Scenario: Retaining factory-calibrated offset/gain values and temperature compensation curves in industrial pressure sensors. IC Role / Device Role / Timing Role: Dedicated calibration memory mapped via SPI-like Microwire interface. Use Value: Maintains measurement accuracy over 200-year lifetime without recalibration drift or battery backup. |
| IoT Edge Node Identity | Industrial HMI Display Settings |
Use Scenario: Holding unique device identifiers (MAC, serial number), TLS certificate fragments, and secure boot keys in battery-operated gateways. IC Role / Device Role / Timing Role: Secure identity store accessed during boot and OTA update verification. Use Value: Provides tamper-resistant, low-power identity persistence independent of main SoC's flash wear. | Use Scenario: Saving user-selected contrast, language, backlight timeout, and alarm thresholds on panel-mounted HMIs. IC Role / Device Role / Timing Role: Persistent UI state memory updated infrequently but retained across AC power cycles. Use Value: Delivers consistent operator experience without volatile RAM backup capacitors or supercapacitors. |
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/MS | 16-bit organization (64 × 16), same VCC/temp/package; requires different address/data framing in firmware. | Suitable where wider word access reduces transaction count (e.g., storing 16-bit ADC calibration pairs). | Select only if system firmware supports x16 addressing and data packing; not drop-in compatible. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, same endurance/retention; lacks Ready/Busy pin - relies on WIP polling. | Better suited for designs already using SPI peripherals; requires additional GPIO for status monitoring or fixed delay. | Choose when migrating from Microwire to SPI ecosystem or when needing lower VCC min (1.8 V). |
Compared with 93LC46BT-I/MS, the 93LC46AT-I/MS offers simpler firmware integration for byte-oriented data; versus AT25010B-MAHL-T, it provides deterministic status feedback without software polling loops - reducing MCU active time and power in duty-cycled edge devices.
Availability
93LC46AT-I/MS is available at Aetrix Electronics and suitable for motor control configuration, smart sensor calibration storage, and IoT edge node identity management requiring stable component supply across extended production lifecycles.
Supply support for 93LC46AT-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC46A/B/C series was designed specifically for cost-sensitive, low-power embedded systems requiring reliable, pin-efficient serial EEPROM - emphasizing robustness in industrial environments and seamless integration with legacy Microwire peripherals.
FAQ
What is the memory organization of the 93LC46AT-I/MS?
The 93LC46AT-I/MS is a fixed 128 × 8-bit (1 Kbit) organization device with no ORG pin - unlike 'C' variants, it does not support x16 mode. This simplifies hardware design by eliminating external ORG pull-up/down resistors and ensures consistent 8-bit data framing in firmware. All 93LC46A parts, including 93LC46AT-I/MS, operate exclusively in x8 mode.
Does the 93LC46AT-I/MS require an external pull-up resistor on the DO line?
No, the 93LC46AT-I/MS does not require an external pull-up on DO. Its DO pin actively drives high/low during read and Ready/Busy status reporting, and enters High-Z when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during dummy-zero read phases - per Microchip DS20001749K Section 2.2.
What is the maximum clock frequency supported by the 93LC46AT-I/MS?
The 93LC46AT-I/MS supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V (Table 1-2, A1). At 2.5 V ≤ VCC < 4.5 V, max clock is 2 MHz; below 2.5 V, it drops to 1 MHz. These limits ensure setup/hold timing margins (e.g., TDIS, TDIH) are met across voltage and temperature ranges specified for the Industrial grade.
How does the 93LC46AT-I/MS protect against unintended writes during power transitions?
The 93LC46AT-I/MS incorporates hardware voltage detection (VPOR ≈ 1.5 V) that disables all write/erase operations when VCC falls below this threshold - preventing partial writes during power-up, power-down, or brownout. Additionally, it powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN command before any programming, adding a second layer of protection against firmware glitches.
Can the 93LC46AT-I/MS be used in automotive applications?
The 93LC46AT-I/MS is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, Microchip specifies the 93LC46A-E/MS variant - identical functionality but qualified to AEC-Q100 Grade 3. Using 93LC46AT-I/MS in under-hood or dashboard applications may violate thermal reliability requirements and void warranty compliance.
93LC46AT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93LC46AT-I/MS FAQ
1.How can I place an order for 93LC46AT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AT-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 93LC46AT-I/MS reliable?
The price and inventory of 93LC46AT-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 93LC46AT-I/MS is usually 5 days.
3.What payment methods are accepted for 93LC46AT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AT-I/MS?
93LC46AT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AT-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 93LC46AT-I/MS?
For technical support, including 93LC46AT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AT-I/MS requirements.
6.How does Aetrix verify that 93LC46AT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93LC46AT-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 93LC46AT-I/MS meets industry standards.
7.What is the process for return or replacement of 93LC46AT-I/MS?
All 93LC46AT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AT-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 93LC46AT-I/MS part is unused and in its original packaging.
Return procedure for 93LC46AT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46AT-I/MS 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
