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Microchip Technology 93LC46A/ST
- Part No.:
- 93LC46A/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC46A/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,126
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Product details
Overview
93LC46A/ST from Microchip Technology Inc. is a 1Kbit (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 - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46A/ST datasheet, 93LC46A/ST pinout, 93LC46A/ST application, or 93LC46A/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOIC-8 (ST) package compatibility, 1 million endurance cycles, 200-year data retention, and support for sequential read and write-all operations in space-constrained industrial control modules.
Technical Context
The 93LC46A/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (dedicated x8 mode). Communication uses start-bit detection followed by opcode, address, and data clocked on CLK rising edges; DO outputs data or Ready/Busy status depending on CS timing and operation state.
It employs auto-erase-before-write architecture with self-timed programming cycles (6 ms typical TWC), integrated power-on reset detection (VPOR = 1.5 V), and EWEN/EWDS command-based write protection. All operations are inhibited below VCC threshold, ensuring robust data integrity during brown-out conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization - fixed, no ORG pin) |
| VCC range | 2.5 V to 5.5 V - supports wide-input industrial rails and 3.3 V/5 V mixed-signal systems |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or logging updates in field-deployed devices |
| Data retention | Greater than 200 years at 25°C - ensures long-term firmware parameter storage without refresh |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, compatible with legacy MCU peripherals |
| Temp range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and industrial motor drive environments |
| Write cycle time | 6 ms max (TWC) - deterministic timing for real-time system scheduling of nonvolatile writes |
Pinout & Package
93LC46A/ST is supplied in an 8-lead SOIC package (ST suffix), with standard pinout matching industry Microwire EEPROMs. Pin 1 is CS, Pin 2 is CLK, Pin 3 is DI, Pin 4 is DO, Pin 5 is VSS, Pin 6 is NC (no internal connection - ORG not present), Pin 7 is NC, and Pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers on rising edge; stoppable mid-sequence for master flexibility |
| DI (Pin 3) | Data Input | Accepts start bit, opcode, address, and write data; high-impedance when not selected |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be connected before VCC during power-up |
| NC (Pin 6) | No Connection | Unused - internally unconnected; may be left floating or tied to ground per layout best practice |
| NC (Pin 7) | No Connection | Unused - same as Pin 6; no functional role in 93LC46A variant |
| VCC (Pin 8) | Power Supply | 2.5–5.5 V input; includes on-chip voltage detect (VPOR = 1.5 V) for automatic write inhibit during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry - 6 ms max cycle completes autonomously after CS fall |
| Automatic ERAL before WRAL | Ensures full-array readiness before bulk write - prevents partial-program corruption in firmware update routines |
| Power-on/off data protection | Hardware-level VCC monitoring blocks writes below 1.5 V - no software intervention required |
| Ready/Busy status via DO | Enables polling-based write completion detection without interrupt lines or additional pins |
| Sequential read mode | Reduces host overhead - continuous data stream across addresses while CS remains high |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in smart pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up and runtime recalibration sequences. Use Value: 128 × 8-bit capacity holds 16+ calibration parameters; 200-year retention ensures lifetime accuracy without battery backup. | Use Scenario: Saving seat position memory, mirror presets, and lighting profiles in automotive door modules. IC Role / Device Role / Timing Role: Microwire-configurable EEPROM interfaced directly to 8-bit automotive MCU with limited SPI resources. Use Value: −40°C to +125°C rating guarantees reliable operation in door latch assemblies exposed to engine bay heat and winter cold. |
| Medical Infusion Pump Settings | Industrial PLC Configuration Storage |
Use Scenario: Retaining drug library definitions, dose limits, and alarm thresholds across power cycles in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical parameter store accessed only during initialization and authorized service mode. Use Value: EWEN/EWDS command lockout prevents accidental overwrites; 1M-cycle endurance supports >10 years of daily recalibration. | Use Scenario: Holding I/O mapping tables, PID tuning constants, and communication protocol settings in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Serial configuration memory mapped into MCU's peripheral address space via bit-banged Microwire driver. Use Value: SOIC-8 (ST) footprint allows drop-in replacement in legacy designs; 2.5–5.5 V range matches 3.3 V controller rails and 5 V backplane supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B/ST | 16-bit organization (64 × 16), same VCC/temp range, identical pinout but no ORG pin - incompatible data framing | Requires 16-bit host interface; unsuitable for 8-bit MCU systems without byte-splitting logic | Select only if host system natively supports 16-bit serial access and requires denser addressing |
| AT25010B-SSHL-T | 1 Kbit SPI EEPROM (SPI mode), 1.8–5.5 V, 20 MHz max clock, different instruction set and status reporting | Uses SPI protocol instead of Microwire; requires different driver firmware and CS/CLK timing handling | Choose when migrating to SPI-based platforms or needing higher clock speeds; not pin- or code-compatible |
Compared with 93LC46B/ST and AT25010B-SSHL-T, the 93LC46A/ST provides guaranteed 8-bit Microwire compatibility, deterministic 6 ms write timing, and direct drop-in support for legacy Microchip EEPROM firmware stacks - critical for cost-sensitive industrial replacements.
Availability
93LC46A/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical infusion pump settings, and industrial PLC configuration storage requiring stable component supply across extended product lifecycles.
Supply support for 93LC46A/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/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-power, pin-efficient nonvolatile storage in resource-constrained embedded systems where Microwire interface compatibility and long-term data integrity are essential.
FAQ
What is the memory organization of the 93LC46A/ST?
The 93LC46A/ST has a fixed 128 × 8-bit (1 Kbit) organization with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support dynamic word-size selection, simplifying host interface design for 8-bit microcontrollers. This configuration is confirmed in the Device Selection Table and Pin Function Table of DS20001749K.
Does the 93LC46A/ST require an external pull-up resistor on the DO pin?
No, the 93LC46A/ST does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when deselected or idle. However, a series resistor (e.g., 100 Ω) is recommended if DI and DO share a bidirectional bus to prevent bus conflict during dummy-zero read phases.
What is the minimum VCC required for write operations on the 93LC46A/ST?
The 93LC46A/ST requires VCC ≥ 2.5 V for all operations, and write functions are automatically inhibited below VPOR = 1.5 V (typical). This hardware-level protection ensures data integrity during power ramp-up or brown-out events - no software voltage monitoring is needed before issuing EWEN or WRITE commands.
Can the 93LC46A/ST be used in automotive applications?
Yes, the 93LC46A/ST is qualified for Automotive (E) grade with operation from −40°C to +125°C and is listed in the Device Selection Table with "I, E" temperature support. Its RoHS-compliant Pb-free SOIC-8 (ST) package and built-in power-supply monitoring make it suitable for body electronics, infotainment configuration, and ADAS subsystems meeting AEC-Q100 stress test requirements.
How does the 93LC46A/ST handle write protection?
The 93LC46A/ST uses command-based write protection: it powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN instruction before any ERASE or WRITE. After programming, executing EWDS re-enables protection. This dual-command scheme prevents accidental writes due to noise or firmware glitches - a critical feature for field-updatable embedded systems using the 93LC46A/ST.
93LC46A/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC46A/ST FAQ
1.How can I place an order for 93LC46A/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46A/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 93LC46A/ST reliable?
The price and inventory of 93LC46A/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46A/ST is usually 5 days.
3.What payment methods are accepted for 93LC46A/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46A/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46A/ST?
93LC46A/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46A/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 93LC46A/ST?
For technical support, including 93LC46A/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46A/ST requirements.
6.How does Aetrix verify that 93LC46A/ST is sourced from the original manufacturer or authorized distributors?
All 93LC46A/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 93LC46A/ST meets industry standards.
7.What is the process for return or replacement of 93LC46A/ST?
All 93LC46A/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46A/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 93LC46A/ST part is unused and in its original packaging.
Return procedure for 93LC46A/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46A/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
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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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
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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