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Microchip Technology 93C46AT-I/MNY
- Part No.:
- 93C46AT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93C46AT-I/MNY.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,220
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Product details
Overview
93C46AT-I/MNY from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating at 4.5–5.5 V, 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/WRAL support, and Ready/Busy status signaling via DO pin - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93C46AT-I/MNY datasheet, 93C46AT-I/MNY pinout, 93C46AT-I/MNY application, or 93C46AT-I/MNY equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms program cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire host controllers requiring minimal I/O overhead.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins, using rising-edge clocking for instruction/address/data transfer. Its internal logic enforces power-on write protection and requires explicit EWEN command before any erase or write operation - ensuring robustness against spurious writes during power transitions.
The 93C46AT-I/MNY uses dedicated 8-bit memory mapping (128 × 8), eliminating ORG pin dependency. All timing-critical operations - including READ (18 CLK cycles), WRITE (18 CLK cycles), ERAL (6 ms), and WRAL (15 ms) - are fully self-timed and initiated by CS falling edge (for 93C-series), with DO pin providing real-time Ready/Busy feedback during programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 words × 8 bits) - fixed x8 organization; no ORG pin required. |
| VCC Range | 4.5 V to 5.5 V - supports standard 5 V systems; POR threshold at 3.8 V ensures reliable power-up behavior. |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware or calibration updates in field-deployed devices. |
| Data Retention | 200 years at +25°C - suitable for long-lifecycle industrial equipment without periodic refresh. |
| Program Cycle Time | 2 ms (TWC) - deterministic write latency critical for time-constrained boot/configuration sequences. |
| Interface Protocol | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode or address latching required. |
| Temperature Range | Industrial: −40°C to +85°C - validated for use in motor control, sensor modules, and industrial HMIs. |
Pinout & Package
8-lead MSOP (MS) package, 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad (optional VSS connection). Pin 1 marked by laser dot; pin 1 ID corner indicated on top marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed programming on falling edge (93C-series). |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clock required during auto-erase/write cycle. |
| DI | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS to detect Start condition. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status polling. |
| VSS | Ground | Reference for all digital and analog functions; exposed pad may be connected to VSS for thermal/EMI improvement. |
| NC | No Internal Connection | Pin 7 in MSOP - unconnected; must not be tied to any signal or power rail. |
| VCC | Power Supply | 4.5–5.5 V supply; internal voltage detector (VPOR = 3.8 V) blocks writes below threshold. |
| ORG | Organization Select | Not present - 93C46A variant has no ORG pin; fixed 8-bit operation only. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control; 2 ms TWC guarantees predictable write completion for deterministic firmware flow. |
| Automatic ERAL before WRAL | WRAL command internally executes full-array erase prior to write - no separate ERAL instruction needed in host firmware. |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below 3.8 V VCC - prevents corruption during brown-out or hot-plug events. |
| Ready/Busy Status via DO | Enables non-blocking polling instead of fixed delays; reduces average write latency in interrupt-driven systems. |
| Industry Standard Microwire Interface | Direct drop-in replacement for legacy 93C46 devices; no protocol translation or driver modification required. |
Applications
| Motor Control Configuration Storage | Industrial Sensor Calibration Data |
|---|---|
|
Use Scenario: Storing motor phase alignment offsets, current limit thresholds, and PID coefficients in BLDC motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime re-calibration; 2 ms write time fits within safety-critical startup windows. Use Value: Enables field-updatable tuning without firmware reflashing; 200-year retention ensures calibration integrity over equipment lifetime. |
Use Scenario: Holding factory-trimmed gain/offset values and temperature compensation tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to MCU's GPIO or hardware Microwire peripheral; single-byte reads/writes suffice. Use Value: Eliminates need for external trimming components; 1M endurance supports recalibration during maintenance cycles. |
| Medical Device Parameter Backup | Smart Energy Meter Settings |
|
Use Scenario: Preserving user-adjustable therapy parameters and audit logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, low-power backup memory accessed only during parameter save or power-down sequence. Use Value: Meets IEC 62304 data integrity requirements; RoHS-compliant Pb-free finish satisfies medical regulatory packaging mandates. |
Use Scenario: Storing tariff schedules, meter ID, and tamper-event flags in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with hardware write-protection activated below 3.8 V. Use Value: Prevents unauthorized parameter changes during voltage glitch attacks; industrial temp rating ensures outdoor enclosure reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46BT-I/MNY | 128 × 16-bit organization; same VCC range, package, and timing; requires 16-bit host interface. | Used where wider data path reduces transaction count (e.g., storing 16-bit ADC calibration words). | Select only if host system supports native 16-bit Microwire transfers and memory layout benefits outweigh added software complexity. |
| 93LC46AT-I/MNY | Wider VCC range (2.5–5.5 V); identical 128 × 8-bit organization and pinout; 6 ms TWC vs. 2 ms. | Suitable for mixed-voltage systems (e.g., 3.3 V MCU with 5 V peripherals) where lower VCC operation is required. | Prefer when design operates below 4.5 V; accept longer write latency for broader supply flexibility. |
Compared with 93C46BT-I/MNY, the 93C46AT-I/MNY offers faster 2 ms writes and simpler 8-bit data handling; compared with 93LC46AT-I/MNY, it trades supply flexibility for guaranteed 5 V performance and shorter programming time - ideal for cost-sensitive, fixed-rail industrial controls.
Availability
93C46AT-I/MNY is available at Aetrix Electronics and suitable for motor control systems, industrial sensor nodes, and medical device configuration storage requiring stable component supply across multi-year production cycles.
Supply support for 93C46AT-I/MNY 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 manufacturing and support infrastructure.
The 93C46A/B/C series was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal MCU resource usage - targeting industrial, automotive, and consumer applications where Microwire compatibility and proven field reliability are essential.
FAQ
What is the memory organization of the 93C46AT-I/MNY?
The 93C46AT-I/MNY is a fixed 128 × 8-bit (1 Kbit) serial EEPROM with no ORG pin - unlike the 'C' variants, it does not support word-size selection. This simplifies hardware design by eliminating external ORG pull-up/pull-down resistors and ensures consistent 8-bit data framing in all applications. The 93C46AT-I/MNY maintains full backward compatibility with legacy 93C46A designs.
Does the 93C46AT-I/MNY require an external pull-up resistor on the DO line?
No, the 93C46AT-I/MNY does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy polling, and enters High-Z when CS is low or after status is cleared. However, if DI and DO are wire-OR'd (shared bus), a 10 kΩ series resistor between them is recommended to prevent bus conflict during dummy-zero read preamble - per Microchip DS20001749K Section 2.2.
What is the minimum VCC required to initiate a write operation on the 93C46AT-I/MNY?
The 93C46AT-I/MNY requires VCC ≥ 4.5 V to operate, and its internal voltage detector (VPOR) blocks all write/erase commands below 3.8 V. Therefore, write operations are only permitted when VCC is stably within 4.5–5.5 V. Attempting writes outside this window results in ignored commands and no memory change - a hardware-level safeguard against data corruption during brown-out conditions.
How is the Ready/Busy status monitored on the 93C46AT-I/MNY?
Ready/Busy status is monitored by sampling the DO pin after bringing CS high for ≥250 ns following a WRITE, ERASE, ERAL, or WRAL command. DO = low indicates ongoing programming; DO = high confirms completion. After status read, issuing a Start bit followed by CS low clears the status flag. This polling method avoids fixed delays and enables efficient CPU utilization in interrupt-driven firmware.
Can the 93C46AT-I/MNY be used in place of the 93C46A in existing designs?
Yes - the 93C46AT-I/MNY is a direct replacement for the 93C46A with identical electrical specifications, pinout, timing, and functional behavior. The "T" suffix denotes tape-and-reel packaging, and "I/MNY" specifies Industrial temperature grade in MSOP package. No PCB or firmware changes are required; it maintains full drop-in compatibility while offering enhanced manufacturability and traceability per Microchip's current production standards.
93C46AT-I/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93C46AT-I/MNY FAQ
1.How can I place an order for 93C46AT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AT-I/MNY 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 93C46AT-I/MNY reliable?
The price and inventory of 93C46AT-I/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46AT-I/MNY is usually 5 days.
3.What payment methods are accepted for 93C46AT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AT-I/MNY?
93C46AT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AT-I/MNY 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 93C46AT-I/MNY?
For technical support, including 93C46AT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AT-I/MNY requirements.
6.How does Aetrix verify that 93C46AT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 93C46AT-I/MNY 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 93C46AT-I/MNY meets industry standards.
7.What is the process for return or replacement of 93C46AT-I/MNY?
All 93C46AT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AT-I/MNY, 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 93C46AT-I/MNY part is unused and in its original packaging.
Return procedure for 93C46AT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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