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Microchip Technology 93C46CT-E/MS
- Part No.:
- 93C46CT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C46CT-E/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,515
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Product details
Overview
93C46CT-E/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial-temperature operation (–40°C to +85°C). 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 in embedded system configuration storage where nonvolatile parameter retention and simple serial interface are required.
For engineers reviewing the 93C46CT-E/MS datasheet, 93C46CT-E/MS pinout, 93C46CT-E/MS application, or 93C46CT-E/MS equivalent, this page delivers verified electrical specs, package mapping to 8-lead MSOP, functional timing behavior, real-world use scenarios, and two validated alternative parts for design flexibility and supply continuity.
Technical Context
The 93C46CT-E/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (as confirmed by Device Selection Table and Pin Function Table), fixing it as an 8-bit organization device. Its internal architecture includes auto-erase-before-write logic, EWEN/EWDS command-based write protection, and voltage-detect circuitry that inhibits operation below 3.8 V.
Timing behavior is defined by strict AC parameters: max 3 MHz clock frequency at VCC ≥ 4.5 V, TWC = 2 ms program cycle time, TEC = 6 ms ERAL time, and TPD ≤ 200 ns data output delay. The DO pin serves dual role - serial data output during READ and active-low Ready/Busy indicator during erase/write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; supports 128-byte configuration storage. |
| VCC Range | 4.5 V to 5.5 V - requires stable 5 V rail; operation inhibited below 3.8 V (VPOR threshold). |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no I²C or SPI; minimal GPIO footprint. |
| Write Endurance | 1,000,000 erase/write cycles - suitable for infrequent field-updatable settings (e.g., calibration data). |
| Data Retention | 200 years at +25°C - ensures long-term reliability in unpowered storage without refresh. |
| Access Time | TPD ≤ 200 ns (VCC ≥ 4.5 V, CL = 100 pF) - enables fast read response in real-time control loops. |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for industrial automation, metering, and base-station equipment. |
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 per DS20001749K-page 13). Pin 1 marked by laser dot; pin 1 ID corner matches standard MSOP orientation.
| 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 mode. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely; not required during self-timed write cycle. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; shares net with DO only with external current-limiting resistor. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires TCSL ≥250 ns before status check. |
| 5 (VSS) | Ground | Reference return path; exposed pad may connect to VSS for thermal/electrical performance. |
| 6 (NC) | No Internal Connection | Unbonded; must be left floating or tied to VSS - no functionality or timing impact. |
| 7 (ORG) | Organization Select | Not present on 93C46A/B variants - pin is NC; confirms fixed 8-bit word size (no configuration needed). |
| 8 (VCC) | Power Supply | 4.5–5.5 V input; internal POR circuit blocks all operations until VCC ≥3.8 V. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control - 2 ms typical TWC allows deterministic firmware wait-loop implementation. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; avoids partial-erase corruption in system initialization routines. |
| Power-On/Off Data Protection | Hardware-enforced lockout below 3.8 V prevents inadvertent writes during brown-out or hot-plug events. |
| Ready/Busy Status via DO | Enables polling-based flow control without extra GPIO; reduces interrupt overhead in resource-constrained MCUs. |
| 128 × 8-bit Fixed Organization | Simplifies address decoding and buffer management - no runtime ORG pin configuration or word-size branching logic. |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Memory |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in programmable logic controllers (PLCs) and process transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot or maintenance mode; reads occur once per power cycle; writes only during calibration procedure. Use Value: 200-year data retention ensures coefficient integrity across product lifetime; 1M endurance supports field recalibration over decades. |
Use Scenario: Holding user-configurable settings (baud rate, network ID, alarm thresholds) in HVAC controllers and smart meters. IC Role / Device Role / Timing Role: Serial configuration store interfaced to MCU's GPIO bit-banged Microwire driver; accessed on demand during UI navigation or communication setup. Use Value: 3 MHz max clock enables sub-100 µs read access; fixed 8-bit organization simplifies firmware byte-addressing logic. |
| Power Supply Trim Parameter Storage | Legacy Industrial Equipment Upgrade Module |
|
Use Scenario: Storing digital trim values for DC-DC converter feedback networks in telecom power supplies. IC Role / Device Role / Timing Role: Low-pin-count nonvolatile memory co-located with PMIC; written once during production test; read at power-up to set DAC outputs. Use Value: 4.5–5.5 V VCC range aligns with standard 5 V bias rails; NC ORG pin eliminates external pull-up/pull-down components. |
Use Scenario: Retrofitting legacy 8-bit microcontroller systems (e.g., 8051-based motor drives) with modern configuration storage capability. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 93C46 variants; identical pinout and instruction set preserves PCB layout and firmware compatibility. Use Value: MSOP package fits space-constrained legacy boards; RoHS-compliant matte tin finish meets modern compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46CT-I/MS | Same 1 Kbit x8 EEPROM in 8-lead MSOP, but rated for Industrial temp only (–40°C to +85°C); identical VCC, timing, and pinout. | No automotive qualification; lacks E-temp screening and extended high-temp reliability testing. | Select when operating ambient stays ≤+85°C and cost sensitivity outweighs automotive-grade assurance. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (not Microwire); operates at 1.8–5.5 V; SOIC-8 package; supports faster 20 MHz SPI clock. | Requires SPI interface instead of Microwire; different instruction set and status reporting (no DO-based R/B polling). | Choose only if migrating to SPI infrastructure; verify firmware rewrite for command protocol and timing differences. |
Compared with 93C46CT-E/MS, the 93C46CT-I/MS offers identical functionality at lower cost for non-automotive use, while AT25010B-MAHL-T provides higher-speed serial access but demands interface and software redesign.
Availability
93C46CT-E/MS is available at Aetrix Electronics and suitable for industrial automation, smart metering, and power supply calibration applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93C46CT-E/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93C46 series belongs to Microchip's legacy Microwire-compatible serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal interface overhead.
FAQ
What is the memory organization of the 93C46CT-E/MS?
The 93C46CT-E/MS is a fixed 128 × 8-bit (1 Kbit) EEPROM with no ORG pin - confirming x8-only organization. Unlike 'C' variants (e.g., 93C46C), it does not support x16 mode. This simplifies address handling and eliminates external ORG pin routing, making it ideal for designs where 8-bit data alignment is standard.
Does the 93C46CT-E/MS require an external pull-up on the DO pin?
No, the 93C46CT-E/MS does not require an external pull-up on DO. During READ, DO actively drives data; during READY/BUSSY polling, it drives low (busy) or high (ready); otherwise, it enters High-Z state. External pull-ups may interfere with valid logic levels and are unnecessary per DS20001749K-page 6 and Figure 2-7.
What is the minimum VCC required for write operations on the 93C46CT-E/MS?
Write operations on the 93C46CT-E/MS are blocked unless VCC ≥ 3.8 V, as specified by VPOR (VCC voltage detect) in Table 1-1. Below this threshold, the internal power-on reset circuit inhibits all erase/write commands - including EWEN - ensuring data integrity during power ramp-up or brown-out conditions.
Can the 93C46CT-E/MS be used in place of the 93C46B variant?
No - the 93C46CT-E/MS is an 'A'-type (x8) device, while 93C46B is x16. They differ in address depth (7-bit vs. 6-bit), instruction timing (18 vs. 25 CLK cycles for READ/WRITE), and data width. Substituting them would cause firmware misalignment and data corruption; always match the suffix letter (A/B/C) for functional equivalence.
Is the exposed pad on the 93C46CT-E/MS package electrically connected?
Yes - the exposed pad on the 8-lead MSOP package of the 93C46CT-E/MS may be connected to VSS for improved thermal dissipation and ground integrity, or left floating per Microchip DS20001749K-page 13 Note 1. It is not internally connected to any signal other than optional VSS tie.
93C46CT-E/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, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93C46CT-E/MS FAQ
1.How can I place an order for 93C46CT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46CT-E/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 93C46CT-E/MS reliable?
The price and inventory of 93C46CT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46CT-E/MS is usually 5 days.
3.What payment methods are accepted for 93C46CT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46CT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46CT-E/MS?
93C46CT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46CT-E/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 93C46CT-E/MS?
For technical support, including 93C46CT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46CT-E/MS requirements.
6.How does Aetrix verify that 93C46CT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93C46CT-E/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 93C46CT-E/MS meets industry standards.
7.What is the process for return or replacement of 93C46CT-E/MS?
All 93C46CT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C46CT-E/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 93C46CT-E/MS part is unused and in its original packaging.
Return procedure for 93C46CT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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