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Microchip Technology 93LC46CT-E/ST
- Part No.:
- 93LC46CT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46CT-E/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
93LC46CT-E/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for automotive temperature range (−40°C to +125°C), and housed in an 8-lead TSSOP 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 nonvolatile configuration storage in automotive control modules.
For engineers reviewing the 93LC46CT-E/ST datasheet, 93LC46CT-E/ST pinout, 93LC46CT-E/ST application, or 93LC46CT-E/ST equivalent, key selection criteria include voltage compatibility (2.5–5.5 V), automotive-grade reliability, 8-bit fixed organization (no ORG pin), TSSOP-8 footprint, and Microwire protocol timing compliance at up to 2 MHz across full temperature range.
Technical Context
The 93LC46CT-E/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present (confirmed 'A' variant). It uses internal auto-erase-before-write logic and supports sequential read, ERAL (Erase All), and WRAL (Write All) commands with dedicated status polling via DO pin during active programming.
Its architecture includes a 128-word × 8-bit memory array, on-chip address counter, mode decode logic, and output buffer. Power-on reset circuitry disables write operations until explicit EWEN command is issued, and VPOR threshold is 1.5 V, ensuring data integrity during brown-out conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit); fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware initialization. |
| VCC range | 2.5 V to 5.5 V; supports wide supply rails common in automotive microcontroller I/O domains and industrial 3.3 V/5 V systems. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified per AEC-Q100 stress test requirements for under-hood applications. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); no separate chip select decoding logic needed, reducing MCU GPIO count. |
| Endurance | 1,000,000 erase/write cycles - sufficient for frequent calibration data updates in engine control units or ADAS sensor modules. |
| Data retention | >200 years at +25°C - ensures long-term reliability of stored calibration coefficients, VIN-specific settings, or security keys without refresh. |
| Max clock frequency | 2 MHz at VCC = 2.5–5.5 V - enables fast configuration loading during boot while maintaining timing margin across voltage/temp extremes. |
Pinout & Package
8-lead TSSOP (ST) package, Pb-free matte tin finish, 3.0 mm × 4.4 mm body, 0.65 mm pitch. Pin 1 marked by laser dot; pin 1 ID corner indicated by beveled edge.
| 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 | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-transfer without corruption. |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when not selected. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge. |
| 5 (VSS) | Ground | Reference return path for all signals; must be low-inductance connection to minimize noise coupling. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - no external tie required or recommended. |
| 7 (ORG) | Organization | No internal connection on 93LC46A variants - pin is NC; unused and may be left floating or tied to VSS/VCC safely. |
| 8 (VCC) | Power Supply | Core supply input; includes internal POR circuit (VPOR = 1.5 V) to inhibit writes during power ramp-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - TWC = 6 ms max per byte/word, freeing MCU resources during programming. |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to bulk write - prevents partial-data corruption if WRAL is issued without prior ERAL. |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC - prevents inadvertent writes during power transients or brownouts. |
| Ready/Busy status via DO | Enables polling-based firmware flow control without interrupt lines - reduces MCU pin count and simplifies driver implementation. |
| RoHS-compliant Pb-free finish | Meets global environmental regulations; matte tin plating ensures solderability and wire-bond compatibility in automated assembly. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and OBD-II diagnostic trouble codes (DTCs) that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration and event logging memory interfaced directly to MCU SPI/Microwire peripheral. Use Value: Automotive-grade temperature tolerance and 1M-cycle endurance ensure reliable DTC retention over 15+ year vehicle lifetime. | Use Scenario: Holding camera calibration offsets, radar beamforming coefficients, and sensor fusion parameters updated during factory calibration or field OTA updates. IC Role / Device Role / Timing Role: Secure, low-power parameter storage accessible during boot and runtime via deterministic Microwire timing. Use Value: 2.5–5.5 V operation matches ADAS domain controller supply rails; >200-year data retention preserves calibration integrity without battery backup. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Saving user preferences (seat position, mirror angle, climate presets) and door lock configuration across power loss. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent storage for human-machine interface (HMI) state variables. Use Value: TSSOP-8 footprint enables compact placement near MCU; low standby current (≤5 µA) minimizes parasitic drain on vehicle battery. | Use Scenario: Storing audio equalizer profiles, radio station presets, Bluetooth pairing tables, and display brightness settings. IC Role / Device Role / Timing Role: Microwire-configurable memory accessed during boot and UI interaction for rapid context restoration. Use Value: Fixed 8-bit organization eliminates ORG pin routing complexity; RoHS-compliant finish meets consumer electronics regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-E/ST | 16-bit organization (64 × 16), same VCC/temp/package - requires ORG = VCC and firmware adaptation for 16-bit addressing. | Used where wider data bus improves throughput (e.g., firmware patch storage), but incompatible with existing 8-bit read/write routines. | Select only if system firmware supports x16 mode and memory map alignment differs from 93LC46CT-E/ST. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (not Microwire), 2.5–5.5 V, −40°C to +125°C, SOIC-8 - different instruction set, no ERAL/WRAL, no DO status polling. | Requires SPI master configuration instead of Microwire; lacks hardware erase-all-before-write guarantee and status pin functionality. | Choose when migrating to SPI infrastructure or when Microwire-specific features (e.g., status polling) are unnecessary. |
Compared with 93LC46BT-E/ST and AT25010B-MAHL-T, the 93LC46CT-E/ST provides deterministic 8-bit Microwire timing, integrated ERAL-before-WRAL safety, and hardware Ready/Busy signaling - critical for real-time automotive firmware where write latency and data integrity are tightly coupled.
Availability
93LC46CT-E/ST is available at Aetrix Electronics and suitable for automotive control units, ADAS sensor modules, body electronics, and infotainment systems requiring stable component supply across extended product lifecycles.
Supply support for 93LC46CT-E/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 93LC46 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power, automotive-qualified nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the memory organization of the 93LC46CT-E/ST?
The 93LC46CT-E/ST is a fixed 128 × 8-bit (1 Kbit) EEPROM - it is an 'A' variant with no ORG pin functionality. Unlike 'C' versions, its word size cannot be reconfigured; all read/write operations use 8-bit data framing and 7-bit addressing (A6–A0), eliminating external ORG pin routing and firmware mode-switching logic.
Does the 93LC46CT-E/ST require an external pull-up resistor on the DO pin?
No, the 93LC46CT-E/ST does not require an external pull-up on DO. The DO pin actively drives high/low during read or status polling and enters High-Z when CS is low or during non-read states. A pull-up is unnecessary and may interfere with valid low-level status signaling during busy periods.
Can the 93LC46CT-E/ST operate reliably at 2.5 V across the full automotive temperature range?
Yes, the 93LC46CT-E/ST is fully specified for 2.5 V to 5.5 V operation across −40°C to +125°C (Automotive 'E' grade). At 2.5 V, maximum clock frequency is 2 MHz, TWC remains ≤6 ms, and all DC/AC parameters including VIH/VIL thresholds and ICC consumption meet datasheet limits under worst-case conditions.
How is write protection implemented on the 93LC46CT-E/ST?
Write protection on the 93LC46CT-E/ST is enforced through three hardware mechanisms: (1) Power-on reset inhibits writes until VCC exceeds 1.5 V, (2) Erase/Write Disable (EWDS) state at power-up blocks all programming until EWEN is issued, and (3) CS must be held low ≥250 ns between instructions to prevent spurious command latching - all independent of firmware control.
Is the 93LC46CT-E/ST pin-compatible with other 8-lead TSSOP EEPROMs like the 25AA010A?
No, the 93LC46CT-E/ST is not pin-compatible with SPI EEPROMs such as the 25AA010A. While both use 8-lead TSSOP packages, their pin functions differ: 93LC46CT-E/ST uses CS/CLK/DI/DO (Microwire), whereas 25AA010A uses CS/SO/WM/WP/HOLD/SI (SPI with additional control pins). Direct substitution would require PCB redesign and firmware rework.
93LC46CT-E/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, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC46CT-E/ST FAQ
1.How can I place an order for 93LC46CT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46CT-E/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 93LC46CT-E/ST reliable?
The price and inventory of 93LC46CT-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46CT-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC46CT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46CT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46CT-E/ST?
93LC46CT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46CT-E/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 93LC46CT-E/ST?
For technical support, including 93LC46CT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46CT-E/ST requirements.
6.How does Aetrix verify that 93LC46CT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46CT-E/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 93LC46CT-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC46CT-E/ST?
All 93LC46CT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46CT-E/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 93LC46CT-E/ST part is unused and in its original packaging.
Return procedure for 93LC46CT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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