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Microchip Technology 93C46AT-I/ST
- Part No.:
- 93C46AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C46AT-I/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,987
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Product details
Overview
93C46AT-I/ST from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), and Ready/Busy status via DO pin. Used for configuration storage in embedded controllers, power supplies, and sensor calibration modules.
For engineers reviewing the 93C46AT-I/ST datasheet, 93C46AT-I/ST pinout, 93C46AT-I/ST application, or 93C46AT-I/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms program cycle time, 1 million erase/write endurance, >200-year data retention, and SOIC-8 (ST) package compatibility with legacy board layouts.
Technical Context
The 93C46AT-I/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed 8-bit x128 organization. Its internal logic enforces power-on write protection and requires explicit EWEN/EWDS commands to enable/disable programming.
Timing is defined by strict AC parameters: max 3 MHz clock frequency at 4.5–5.5 V, 250 ns minimum CS low time between instructions, and 2 ms typical erase/write cycle (TWC). Ready/Busy status is polled via DO pin after CS high assertion, with TSV ≤ 500 ns at 1.8 V and ≤ 200 ns at 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 words × 8 bits); supports compact nonvolatile storage for device IDs, calibration coefficients, or boot settings. |
| VCC Range | 4.5 V to 5.5 V; designed for 5 V systems only - not compatible with 3.3 V or mixed-voltage designs without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); eliminates need for I²C pull-ups or SPI quad lines. |
| Write Cycle Time | 2 ms typical (TWC); enables fast field updates without blocking host MCU for extended periods. |
| Endurance | 1,000,000 erase/write cycles; suitable for applications requiring frequent reconfiguration (e.g., metering, industrial HMI). |
| Data Retention | >200 years at 25°C; ensures long-term reliability in unpowered storage of critical firmware or security keys. |
| Temperature Range | Industrial: –40°C to +85°C; validated for use in automotive ECUs, industrial PLCs, and outdoor equipment. |
Pinout & Package
93C46AT-I/ST is supplied in an 8-lead SOIC package (ST suffix), with standard pinout matching industry Microwire EEPROMs. The device has no ORG pin - confirming fixed 8-bit operation per the 'A' variant designation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state and prevent spurious commands. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence without corruption. |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied high during Start condition detection. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS is low or during non-read operations. |
| 5 (VSS) | Ground | Reference for all digital and analog functions; must be low-impedance connection to avoid timing violations. |
| 6 (NC) | No Internal Connection | Not bonded internally; must remain unconnected or tied to VSS per layout best practice. |
| 7 (NC) | No Internal Connection | Not bonded internally; floating or grounded - no functional impact. |
| 8 (VCC) | Power Supply | 4.5–5.5 V only; internal POR triggers at ~3.8 V - operation below this threshold disables write capability. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry - host MCU initiates command and polls DO for completion instead of managing fixed delays. |
| Automatic ERAL before WRAL | Ensures full array is erased prior to bulk write, preventing data corruption without requiring separate erase+write sequences. |
| Power-On/Off Data Protection | Hardware-level lockout below 3.8 V VCC prevents accidental writes during brown-out or power ramp-up conditions. |
| Ready/Busy Status via DO | Enables efficient polling-based flow control without dedicated status lines or interrupts - reduces GPIO count on resource-constrained MCUs. |
| Sequential Read Mode | Allows continuous address increment with CS held high, enabling fast dump of configuration blocks with minimal command overhead. |
Applications
| Smart Power Supply Configuration | Industrial Sensor Calibration Storage |
|---|---|
|
Use Scenario: Storing trim values, gain/offset coefficients, and safety thresholds in AC-DC and DC-DC power modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization and runtime recalibration. Use Value: Enables field-upgradable calibration without firmware changes; 1M endurance supports factory and service-center reprogramming cycles. |
Use Scenario: Holding calibrated sensor offsets and linearization tables in pressure, temperature, and current-sense transducers. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to microcontroller's Microwire peripheral during sensor startup. Use Value: Eliminates need for external OTP or flash; 200-year retention guarantees accuracy over product lifetime without periodic refresh. |
| Embedded Controller Boot Settings | Legacy Industrial Equipment Parameter Backup |
|
Use Scenario: Saving user-defined operating modes, communication baud rates, and I/O mapping in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM providing persistent parameter storage independent of main controller's flash. Use Value: Supports hot-swappable modules with unique identity and settings - verified across –40°C to +85°C industrial ambient range. |
Use Scenario: Replacing obsolete EPROMs in legacy CNC controllers, HVAC panels, and test equipment where board space and pin compatibility are critical. IC Role / Device Role / Timing Role: Drop-in replacement for 8-pin Microwire EEPROMs using identical SOIC-8 footprint and timing. Use Value: Maintains backward compatibility while adding 1M endurance and improved data retention versus older 93C46 variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-I/ST | Wider VCC range (2.5–5.5 V); same 8-bit x128 organization and SOIC-8 package. | Supports 3.3 V systems; lacks 5 V-specific voltage detect threshold (3.8 V POR), reducing risk of partial writes during 5 V brown-out. | Select when migrating to mixed-voltage designs or requiring guaranteed operation down to 2.5 V. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1.8–5.5 V supply, 1 Kbit (128 × 8), SOIC-8 package. | Requires SPI master instead of Microwire; includes write-protect pin and software write protection beyond EWEN/EWDS. | Choose when existing design uses SPI peripherals or requires additional hardware-level write protection granularity. |
Compared with 93C46AT-I/ST, the 93LC46AT-I/ST offers broader voltage flexibility but identical timing and pinout, while the AT25010B-SSHL-T trades Microwire simplicity for SPI-standardized control and enhanced protection - both require PCB-level interface validation.
Availability
93C46AT-I/ST is available at Aetrix Electronics and suitable for industrial automation, power conversion, and sensor module designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93C46AT-I/ST 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx series was developed specifically for cost-sensitive, low-power embedded systems needing reliable serial nonvolatile memory with minimal pin count and proven Microwire interoperability.
FAQ
What is the function of the NC pins on the 93C46AT-I/ST?
Pins 6 and 7 on the 93C46AT-I/ST are No Connect (NC) terminals - they have no internal bond wire or silicon connection. Per Microchip's datasheet DS20001749K, these pins may be left floating or tied to VSS for mechanical stability, but must never be driven or used as signal paths. Their presence maintains SOIC-8 pin compatibility with other members of the 93XX46 family.
Does the 93C46AT-I/ST support 16-bit word access?
No, the 93C46AT-I/ST does not support 16-bit word access. As indicated by the 'A' suffix and confirmed in the Device Selection Table, it is a fixed 128 × 8-bit organization device with no ORG pin. Only 'B' (16-bit dedicated) and 'C' (ORG-configurable) variants provide x16 operation - the 93C46AT-I/ST exclusively uses 8-bit addressing and data transfer.
What is the minimum VCC required for write operations on the 93C46AT-I/ST?
The 93C46AT-I/ST requires VCC ≥ 4.5 V for all write, erase, and WRAL/ERAL operations. Its internal voltage detector (VPOR) disables programming below ~3.8 V, and the datasheet explicitly states that ERAL and WRAL require VCC ≥ 4.5 V. Operating at 4.4 V or lower will result in failed or incomplete writes, even if read functionality remains active.
How is Ready/Busy status monitored on the 93C46AT-I/ST?
Ready/Busy status on the 93C46AT-I/ST is monitored by sampling the DO pin after asserting CS high for ≥250 ns following a write/erase command. DO = low indicates ongoing operation; DO = high confirms completion. The status is only valid when CS is high and the device is not in Standby mode - holding CS low during programming forces DO into High-Z and hides status information.
Is the 93C46AT-I/ST RoHS compliant and lead-free?
Yes, the 93C46AT-I/ST is RoHS compliant and features a Pb-free Matte Tin (Sn) finish, as stated in the Features section of DS20001749K. All standard packages - including the SOIC-8 (ST) variant - meet JEDEC J-STD-609 Category 1 requirements, with marking "3e" indicating the lead-free designation on the package body.
93C46AT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 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-TSSOP
93C46AT-I/ST FAQ
1.How can I place an order for 93C46AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46AT-I/ST 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/ST reliable?
The price and inventory of 93C46AT-I/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 93C46AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46AT-I/ST?
93C46AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46AT-I/ST 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/ST?
For technical support, including 93C46AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46AT-I/ST requirements.
6.How does Aetrix verify that 93C46AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93C46AT-I/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 93C46AT-I/ST?
All 93C46AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C46AT-I/ST, 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/ST part is unused and in its original packaging.
Return procedure for 93C46AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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