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Microchip Technology 93C46CT-I/SN
- Part No.:
- 93C46CT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46CT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,984
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Product details
Overview
93C46CT-I/SN 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 packaged in 8-lead SOIC (SN). 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 93C46CT-I/SN datasheet, 93C46CT-I/SN pinout, 93C46CT-I/SN application, or 93C46CT-I/SN equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), 2 ms program cycle time, 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire host controllers requiring strict timing compliance at VCC ≥ 4.5 V.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins, using start-bit detection and opcode-driven command execution (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS). It operates exclusively in x8 mode with no ORG pin functionality - consistent with all '93C46A' variants.
Internal logic includes power-on reset protection, voltage-detect circuitry (VPOR = 3.8 V), and automatic erase-before-write. Programming is initiated on the rising edge of CLK for last data bit (93C series), and Ready/Busy status is polled via DO while CS is high after ≥250 ns low time (TCSSL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; supports byte-level writes. |
| VCC Range | 4.5 V to 5.5 V - requires minimum 4.5 V for ERAL/WRAL operations; not functional below 3.8 V. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C protocol support. |
| Write Cycle Time | 2 ms typical - self-timed; includes auto-erase; enables deterministic firmware delay planning. |
| Endurance & Retention | 1,000,000 erase/write cycles and >200 years data retention - validated at 25°C, VCC = 5.0 V. |
| Temperature Range | Industrial: −40°C to +85°C - qualified per Microchip's industrial-grade reliability testing. |
| Package | 8-lead SOIC (SN) - standard footprint; Pb-free matte tin finish; pin-compatible with PDIP (P) and TSSOP (ST). |
Pinout & Package
8-lead SOIC (SN) package with standard Microwire pinout: CS (1), CLK (2), DI (3), DO (4), VSS (5), NC (6), NC (7), VCC (8). Pins 6 and 7 are no-connect (NC) - confirmed for 93C46A/B variants; ORG pin absent.
| 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. |
| 2 - CLK | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely; initiates write cycle on rising edge of final bit (93C). |
| 3 - DI | Data Input | Accepts start bit, opcodes, addresses, and write data; shares bus 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 CS high ≥250 ns to sample status. |
| 5 - VSS | Ground | Reference return path for all signals; must be low-impedance connection to minimize noise coupling. |
| 6 - NC | No Internal Connection | Unbonded; must remain floating or tied to VSS per layout best practice; not usable as ORG or control. |
| 7 - NC | No Internal Connection | Unbonded; identical handling as Pin 6; no internal function or routing. |
| 8 - VCC | Power Supply | 4.5–5.5 V supply; internal POR triggers at ~3.8 V; voltage must remain stable during ERAL/WRAL (≥4.5 V required). |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control; 2 ms guaranteed completion enables simple polling or fixed-delay firmware waits. |
| Automatic ERAL before WRAL | WRAL instruction internally executes full-array erase prior to write - no separate ERAL command needed in system code. |
| Power-On/Off Data Protection | Voltage-detect circuitry disables all writes below 3.8 V, preventing corruption during brown-out or power ramp conditions. |
| Erase/Write Enable/Disable (EWEN/EWDS) | Device powers up in EWDS state; explicit EWEN required before any programming - prevents accidental overwrites during boot. |
| Ready/Busy Status via DO | Enables real-time status polling without dedicated status lines; reduces pin count and simplifies host interface design. |
Applications
| Industrial Control Configuration Storage | Consumer Appliance Parameter Memory |
|---|---|
Use Scenario: Storing calibration offsets, user preferences, and fault logs in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently via MCU GPIO-banged Microwire interface. Use Value: Ensures settings survive power loss; 1M endurance supports decades of field updates; 4.5–5.5 V range matches industrial 5 V rails. |
Use Scenario: Retaining cooking programs, timer values, and display brightness settings in microwave ovens and washing machines. IC Role / Device Role / Timing Role: Low-pin-count memory interfaced to 8-bit MCU with limited peripheral resources. Use Value: SOIC (SN) package enables cost-effective reflow assembly; 200-year retention guarantees lifetime data integrity without battery backup. |
| Automotive Body Controller NVM | Legacy Embedded System Upgrade Memory |
Use Scenario: Saving seat/mirror position presets and lighting profiles in automotive body control modules (BCM). IC Role / Device Role / Timing Role: Secondary NVM supplementing main MCU flash; accessed during initialization or user input events. Use Value: Industrial temp rating satisfies under-hood ambient requirements; 3.8 V POR prevents writes during ignition cranking dips. |
Use Scenario: Replacing obsolete EPROMs or parallel EEPROMs in legacy industrial instruments with minimal PCB change. IC Role / Device Role / Timing Role: Drop-in Microwire-compatible replacement requiring only CS/CLK/DI/DO signal routing. Use Value: Identical 8-pin SOIC footprint and timing behavior (TCSSL, TCKH, TPD) allows direct substitution without firmware modification. |
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/SN | Wider VCC range (2.5–5.5 V); same 128×8 organization; identical SOIC-8 pinout and Microwire interface. | Supports 3.3 V systems; lacks 4.5 V minimum requirement - unsuitable where 5 V rail stability is marginal. | Select when migrating to mixed-voltage designs or extending battery life in 3.3 V applications. |
| 93AA46AT-I/SN | Lowest VCC (1.8–5.5 V); same 128×8 organization; identical SOIC-8 pinout and instruction set. | Enables ultra-low-power operation down to 1.8 V; higher leakage at low VCC may affect long-term standby current. | Choose for energy-sensitive portable or battery-backed systems requiring extended voltage margin. |
Compared with 93LC46AT-I/SN and 93AA46AT-I/SN, the 93C46CT-I/SN offers highest noise immunity and robustness on noisy 5 V industrial buses due to its 4.5–5.5 V operating window and tighter AC timing margins, but sacrifices voltage flexibility.
Availability
93C46CT-I/SN is available at Aetrix Electronics and suitable for industrial control configuration storage, consumer appliance parameter memory, automotive body controller NVM, and legacy embedded system upgrade memory requiring stable component supply across multi-year production cycles.
Supply support for 93C46CT-I/SN 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 93C46CT-I/SN belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count nonvolatile storage in industrial and consumer systems relying on Microwire protocol compatibility.
FAQ
What is the memory organization of the 93C46CT-I/SN?
The 93C46CT-I/SN is a fixed 128 × 8-bit (1 Kbit) EEPROM with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants (e.g., 93C46C), it does not support x16 configuration. This is confirmed by the Device Selection Table and Pin Function Table in DS20001749K, which list '93C46A' devices as 'No ORG' and '8-bit'.
Does the 93C46CT-I/SN support 3.3 V operation?
No, the 93C46CT-I/SN does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, and its power-on reset threshold is 3.8 V. Attempting to operate below 4.5 V will prevent ERAL and WRAL functions and may cause unreliable writes - use 93LC46AT-I/SN or 93AA46AT-I/SN for 3.3 V or lower systems.
How is the Ready/Busy status monitored on the 93C46CT-I/SN?
Ready/Busy status is monitored on the DO pin: DO = low indicates active erase/write; DO = high indicates completion. To sample status, CS must be brought high for ≥250 ns after being low (TCSSL), then the DO level is read. The status remains valid until CS is taken low again - confirmed in Section 2.4 and Figure 2-1 of DS20001749K.
What is the maximum clock frequency supported by the 93C46CT-I/SN?
The 93C46CT-I/SN supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V (Table 1-2, A1). This applies to all instructions including READ, WRITE, and ERASE. Timing parameters such as TCKH (200 ns min) and TCKL (100 ns min) are defined for this voltage range and must be met for reliable operation.
Is the 93C46CT-I/SN RoHS compliant and Pb-free?
Yes, the 93C46CT-I/SN is RoHS compliant and features a Pb-free matte tin (Sn) finish, as stated in the Features section and Packaging Information (Section 4.1) of DS20001749K. The 'SN' suffix explicitly denotes the 8-lead SOIC package with Pb-free termination per JEDEC standards.
93C46CT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C46CT-I/SN FAQ
1.How can I place an order for 93C46CT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46CT-I/SN 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-I/SN reliable?
The price and inventory of 93C46CT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46CT-I/SN is usually 5 days.
3.What payment methods are accepted for 93C46CT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46CT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46CT-I/SN?
93C46CT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46CT-I/SN 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-I/SN?
For technical support, including 93C46CT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46CT-I/SN requirements.
6.How does Aetrix verify that 93C46CT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93C46CT-I/SN 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-I/SN meets industry standards.
7.What is the process for return or replacement of 93C46CT-I/SN?
All 93C46CT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46CT-I/SN, 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-I/SN part is unused and in its original packaging.
Return procedure for 93C46CT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46CT-I/SN Tags
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