My Inquiry
My Account
Microchip Technology 93C46CT-E/ST
- Part No.:
- 93C46CT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C46CT-E/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,290
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93C46CT-E/ST 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 grade (–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 for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93C46CT-E/ST datasheet, 93C46CT-E/ST pinout, 93C46CT-E/ST application, or 93C46CT-E/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOIC-8 package (ST suffix), 2 ms program cycle time, 1 million endurance cycles, and compatibility with legacy Microwire controllers requiring minimal firmware changes.
Technical Context
The 93C46CT-E/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. Its internal architecture includes an address decoder, data register, and mode decode logic enabling READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on the rising edge of CLK. The device powers up in EWDS mode for write protection.
Unlike 'C' variants, this 'T'-suffixed part has no ORG pin (fixed x8 organization), and unlike 'A'/'B' variants, it supports only 4.5–5.5 V operation with mandatory ≥4.5 V for ERAL and WRAL functions. Its timing is defined by TCSL (250 ns min), TPD (≤400 ns at 4.5–5.5 V), and TWC (2 ms erase/write).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - provides compact nonvolatile storage for calibration data, device IDs, or small firmware patches. |
| VCC range | 4.5 V to 5.5 V - compatible with standard 5 V logic systems; requires ≥4.5 V for ERAL/WRAL execution. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware. |
| Write cycle time | 2 ms typical - enables fast field updates without blocking host CPU for extended periods. |
| Endurance | 1,000,000 erase/write cycles - supports frequent reconfiguration in industrial control or metering applications. |
| Data retention | 200 years at 25°C - ensures long-term reliability in unattended equipment like remote sensors or utility meters. |
| Temperature range | –40°C to +85°C (Industrial) - validated for operation in harsh ambient environments without derating. |
Pinout & Package
93C46CT-E/ST is housed in an 8-lead SOIC package (ST suffix), with gull-wing leads, 1.27 mm pitch, and Pb-free Matte Tin finish. Pin 1 is marked by laser dot; pin 1 ID corner is top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed programming on falling edge for 93C devices. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely; not required during auto-erase/write cycle. |
| 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 (low = busy); enters High-Z on CS falling edge. |
| 5 (VSS) | Ground | Reference for all digital and analog circuitry; must be low-impedance connection. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice. |
| 7 (NC) | No Connect | Internally unconnected; no external connection required. |
| 8 (VCC) | Power Supply | 4.5–5.5 V input; voltage detect threshold is 3.8 V - below which all operations are inhibited. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host only monitors DO for Ready/Busy; reduces firmware complexity. |
| Automatic ERAL before WRAL | Ensures full array erasure prior to bulk write - prevents partial writes and data corruption without software intervention. |
| Power-on/off data protection | Hardware-level inhibition below 3.8 V VCC - prevents inadvertent writes during brown-out or power ramp-up. |
| EWEN/EWDS command set | Enables explicit write-enable/disable - allows safe default-disabled state with controlled activation per operation. |
| Sequential read mode | Continuous data stream across memory addresses while CS remains high - accelerates bulk read of configuration blocks. |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and fault log history in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to 8-bit microcontroller via Microwire; accessed infrequently but requiring guaranteed retention over 10+ years. Use Value: 200-year data retention and 1M endurance ensure reliable operation across multiple maintenance cycles without replacement. | Use Scenario: Holding sensor offset corrections, fuel trim values, and emission control thresholds in engine control units. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM connected to automotive-grade MCU; powered from 5 V rail with strict brown-out immunity. Use Value: 4.5–5.5 V operation and –40°C to +85°C rating match automotive under-hood power and thermal requirements. |
| Medical Device Serial Number Registry | Smart Meter Firmware Patch Storage |
Use Scenario: Recording unique device identifiers, manufacturing dates, and regulatory compliance flags in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory element storing immutable identity data; accessed only during boot or service mode. Use Value: Hardware write-protection (EWDS default) and power-fail safety prevent unauthorized or accidental overwrite of critical traceability data. | Use Scenario: Storing field-upgradable firmware patches for electricity/water/gas meters deployed in remote locations. IC Role / Device Role / Timing Role: Low-pin-count serial memory supporting over-the-air update protocols with minimal MCU GPIO usage. Use Value: 2 ms write time and 128-byte capacity enable rapid patch application without disrupting metering accuracy or real-time clock operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-E/ST | Wider VCC range (2.5–5.5 V); same 8-bit organization and SOIC-8 package. | Supports battery-powered or mixed-voltage systems where 5 V rail may dip below 4.5 V. | Select if system operates below 4.5 V or requires broader supply tolerance. |
| 93AA46AT-E/ST | Lowest VCC range (1.8–5.5 V); identical pinout and instruction set. | Enables direct integration into ultra-low-power or 1.8 V logic domains without level-shifting. | Select for energy-constrained designs such as wireless sensors or portable equipment. |
Compared with 93LC46AT-E/ST and 93AA46AT-E/ST, the 93C46CT-E/ST offers higher noise immunity and tighter timing margins at 5 V, but lacks flexibility for sub-4.5 V operation - making it optimal for stable 5 V industrial control systems where robustness outweighs voltage scalability.
Availability
93C46CT-E/ST is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93C46CT-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 components, and memory solutions, headquartered in Chandler, Arizona.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with Microwire compatibility and robust power-fail protection.
FAQ
What is the memory organization of the 93C46CT-E/ST?
The 93C46CT-E/ST is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - unlike 'C' variants, it does not support x16 configuration. Its organization is permanently set to 8-bit words, simplifying interface design for microcontrollers expecting byte-aligned access without external logic.
Does the 93C46CT-E/ST require an external pull-up resistor on the DO pin?
No, the 93C46CT-E/ST does not require an external pull-up on DO. The pin actively drives high/low during Read and Ready/Busy status reporting, and enters High-Z when deselected or idle. A pull-up may cause bus contention if DI and DO are shorted - use only if explicitly needed for system-level signal integrity.
What is the minimum VCC required for the 93C46CT-E/ST to function?
The 93C46CT-E/ST requires a minimum VCC of 4.5 V for all operations. Its internal voltage detector (VPOR) inhibits all functions below ~3.8 V. Unlike 93AA/93LC variants, it cannot operate at 2.5 V or 1.8 V - attempting to power it below 4.5 V will result in complete functional disable.
How does the 93C46CT-E/ST handle power loss during a write cycle?
The 93C46CT-E/ST incorporates hardware power-loss protection: if VCC drops below ~3.8 V during erase/write, the internal circuitry aborts the operation and retains pre-write data. No data corruption occurs, and the device resumes normal operation once VCC stabilizes above threshold - ensuring integrity in unstable power environments.
Can the 93C46CT-E/ST be used as a drop-in replacement for the 93C46A series?
Yes, the 93C46CT-E/ST is functionally and pin-compatible with other 93C46A variants in SOIC-8 (ST) package, including identical instruction set, timing, and electrical behavior. The 'T' suffix denotes tape-and-reel packaging - not a functional revision - so PCB layout and firmware require no changes.
93C46CT-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:
- 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-TSSOP
93C46CT-E/ST FAQ
1.How can I place an order for 93C46CT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46CT-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 93C46CT-E/ST reliable?
The price and inventory of 93C46CT-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 93C46CT-E/ST is usually 5 days.
3.What payment methods are accepted for 93C46CT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46CT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46CT-E/ST?
93C46CT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46CT-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 93C46CT-E/ST?
For technical support, including 93C46CT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46CT-E/ST requirements.
6.How does Aetrix verify that 93C46CT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C46CT-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 93C46CT-E/ST meets industry standards.
7.What is the process for return or replacement of 93C46CT-E/ST?
All 93C46CT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C46CT-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 93C46CT-E/ST part is unused and in its original packaging.
Return procedure for 93C46CT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46CT-E/ST Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
