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Microchip Technology 93LC46AT-E/ST
- Part No.:
- 93LC46AT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46AT-E/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
93LC46AT-E/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial/automotive temperature support (−40°C to +125°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 93LC46AT-E/ST datasheet, 93LC46AT-E/ST pinout, 93LC46AT-E/ST application, or 93LC46AT-E/ST equivalent, key selection criteria include its 8-bit fixed organization (no ORG pin), TSSOP-8 package, 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire controllers in space-constrained industrial control modules.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating at up to 3 MHz (VCC ≥ 4.5 V), supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal logic enforces power-on write protection and requires explicit EWEN before programming.
The 93LC46AT-E/ST uses CMOS EEPROM cell technology with auto-erase-before-write architecture and integrated voltage detection (VPOR = 1.5 V typical) to prevent corruption during brown-out conditions. All timing parameters - including TWC = 6 ms program cycle, TPD ≤ 400 ns output delay, and TCSL = 250 ns minimum CS low time - are fully specified across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit organization; no ORG pin - fixed 8-bit mode) |
| VCC Range | 2.5 V to 5.5 V - supports wide-input industrial power rails and battery-backed operation |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates in field-deployed equipment |
| Data Retention | 200 years at 25°C - ensures long-term reliability in unattended infrastructure applications |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - interoperable with legacy PIC® MCU peripherals without protocol translation |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5 V - allows fast configuration loading while maintaining noise immunity in noisy environments |
| Operating Temp | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and motor-control applications |
Pinout & Package
93LC46AT-E/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, Pb-free Matte Tin finish, and JEDEC-standard footprint. Pin 1 is marked by laser dot; package dimensions comply with Microchip specification 00000077A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed write on falling edge |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; shares net with DO in bidirectional mode (with current-limiting resistor) |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read operations |
| 5 (VSS) | Ground | Reference return path for all I/O and internal 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 (ORG) | Organization Select | Not present on 93LC46A devices - pin is NC; fixed 8-bit mode eliminates external configuration logic |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply input; includes internal POR circuit (VPOR = 1.5 V typical) for data integrity during power ramp |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write Cycles | Eliminates need for external timing control - 6 ms typical TWC enables deterministic firmware update latency |
| Automatic ERAL Before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial writes and data corruption in system recovery sequences |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below VPOR threshold - protects memory contents during brown-out or cold-start conditions |
| Ready/Busy Status via DO | Enables polling-based host synchronization without dedicated status lines - reduces PCB routing complexity and pin count |
| Sequential Read Function | Allows continuous address increment on single CS assertion - accelerates boot-time configuration loading with minimal clock overhead |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
Use Scenario: Storing calibration coefficients, fault logs, and runtime parameters in a brushless DC motor driver module. IC Role / Device Role / Timing Role: Nonvolatile configuration store interfaced directly to PIC18F MCU's Microwire peripheral. Use Value: 125°C rating ensures reliability near power stages; 1M endurance supports daily recalibration without wear-out risk. |
Use Scenario: Holding door lock actuator profiles, seat position presets, and lighting dimming curves in a LIN-connected body control module. IC Role / Device Role / Timing Role: Parameter EEPROM accessed during startup and infrequent user customization events. Use Value: Automotive-grade temp range and RoHS compliance meet OEM qualification requirements; TSSOP-8 enables compact placement near MCU. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Retaining drug library metadata, dose history, and safety interlock settings in Class II medical equipment. IC Role / Device Role / Timing Role: Secure configuration vault isolated from main processor bus via dedicated Microwire link. Use Value: 200-year data retention satisfies FDA long-term record-keeping mandates; hardware write protection prevents accidental overwrite. |
Use Scenario: Logging tariff schedules, metering calibration constants, and tamper-event timestamps in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Low-power EEPROM accessed only during firmware upgrade or utility command execution. Use Value: 2.5 V min VCC supports operation from supercapacitor backup; 1 µA standby current extends battery life during outages. |
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 | 128 × 16-bit organization (fixed); same VCC range, temp grade, and package | Requires 16-bit data path and controller support; incompatible with 8-bit-only firmware | Select only if system architecture mandates 16-bit word access and memory map alignment |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, same endurance and retention | Requires SPI master instead of Microwire; different instruction set and timing model | Choose when migrating to SPI-based platforms or consolidating interface standards across BOM |
Compared with 93LC46BT-E/ST, the 93LC46AT-E/ST provides native 8-bit compatibility without data packing overhead; versus AT25010B-SSHL-T, it retains Microwire legacy support but lacks SPI daisy-chain capability - critical for multi-device configurations.
Availability
93LC46AT-E/ST is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and medical infusion pump designs requiring stable component supply, long-lifecycle assurance, and automotive-qualified nonvolatile memory.
Supply support for 93LC46AT-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, with global design and manufacturing operations.
The 93LC46A/B/C series was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-power serial EEPROM with Microwire compatibility and extended temperature operation.
FAQ
What is the memory organization of the 93LC46AT-E/ST?
The 93LC46AT-E/ST has a fixed 128 × 8-bit organization - it is an 'A' variant with no ORG pin, meaning it operates exclusively in 8-bit mode. This eliminates external configuration logic and simplifies firmware development compared to 'C' variants that require ORG pin control for x8/x16 selection.
Does the 93LC46AT-E/ST require an external pull-up resistor on the DO pin?
No - the 93LC46AT-E/ST drives DO actively during READ and Ready/Busy polling; a pull-up is unnecessary. However, if DI and DO are shorted for bidirectional use, a current-limiting resistor (e.g., 10 kΩ) is required between them to prevent bus conflict when A0 is high during dummy-zero phase.
What is the minimum VCC required for reliable operation of the 93LC46AT-E/ST?
The 93LC46AT-E/ST requires VCC ≥ 2.5 V for guaranteed operation across its full temperature range (−40°C to +125°C). Its internal voltage detector (VPOR) disables writes below ~1.5 V, preventing data corruption during brown-out - but functional operation begins only at 2.5 V.
How does the 93LC46AT-E/ST handle write protection after power-up?
At power-up, the 93LC46AT-E/ST defaults to Erase/Write Disable (EWDS) mode. An explicit EWEN instruction must be issued before any ERASE or WRITE command executes. This hardware-enforced safeguard prevents accidental overwrites during initialization or noise-induced glitches.
Is the 93LC46AT-E/ST pin-compatible with other members of the 93XX46 family in TSSOP-8?
Yes - the 93LC46AT-E/ST shares identical TSSOP-8 pinout and footprint with all 93XX46A/B/C variants in ST package (e.g., 93LC46BT-E/ST, 93AA46AT-I/ST). However, functional compatibility depends on organization (A vs B), voltage range, and temperature grade - not just pin mapping.
93LC46AT-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
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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
93LC46AT-E/ST FAQ
1.How can I place an order for 93LC46AT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AT-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 93LC46AT-E/ST reliable?
The price and inventory of 93LC46AT-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 93LC46AT-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC46AT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AT-E/ST?
93LC46AT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AT-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 93LC46AT-E/ST?
For technical support, including 93LC46AT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AT-E/ST requirements.
6.How does Aetrix verify that 93LC46AT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46AT-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 93LC46AT-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC46AT-E/ST?
All 93LC46AT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AT-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 93LC46AT-E/ST part is unused and in its original packaging.
Return procedure for 93LC46AT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46AT-E/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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