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Microchip Technology 93LC46B-E/SN
- Part No.:
- 93LC46B-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46B-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,080
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Product details
Overview
93LC46B-E/SN from Microchip Technology Inc. is a 1Kbit, 64 x 16-bit organization serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, supporting Industrial and Automotive temperature ranges (–40°C to +125°C), and featuring self-timed erase/write cycles, automatic ERAL/WRAL, and Ready/Busy status signaling - used for nonvolatile configuration storage in automotive body control modules.
For engineers reviewing the 93LC46B-E/SN datasheet, 93LC46B-E/SN pinout, 93LC46B-E/SN application, or 93LC46B-E/SN equivalent, key selection criteria include VCC range (2.5–5.5V), 16-bit word organization, automotive-grade qualification (E-temp), SOIC-8 package compatibility, and Microwire timing compliance at up to 2 MHz.
Technical Context
The 93LC46B-E/SN implements a synchronous 3-wire Microwire interface with dedicated CS, CLK, and DI/DO lines, requiring no ORG pin (fixed 16-bit mode). It uses CMOS EEPROM technology with on-chip charge pump for internal write voltage generation, enabling full erase/write functionality without external high-voltage supply.
Its command set includes READ (18 clock cycles), WRITE (18 clocks + self-timed 6 ms cycle), ERASE (10 clocks + 6 ms), ERAL (10 clocks + 6 ms), and WRAL (18 clocks + 15 ms), all initiated by CS falling edge (for 93LC variants) and monitored via DO pin status polling. Power-on data protection and EWEN/EWDS lock mechanisms prevent inadvertent writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 × 16-bit), providing compact nonvolatile storage for calibration data or device IDs in space-constrained designs. |
| VCC Range | 2.5V to 5.5V - supports direct connection to 3.3V or 5V rails without level-shifting in automotive and industrial MCU systems. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - simplifies host integration using standard GPIO or SPI peripheral in 3-wire mode. |
| Write Cycle Time | 6 ms typical (TWC) - enables deterministic firmware timeout handling during configuration updates without blocking main application flow. |
| Data Retention | >200 years at +25°C - ensures long-term reliability for automotive ECUs and industrial controllers with infrequent reprogramming. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field calibration or logging use cases over product lifetime. |
| Temperature Range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain applications per AEC-Q100 stress requirements. |
Pinout & Package
93LC46B-E/SN is packaged in an 8-lead SOIC (SN) with 150-mil width, RoHS-compliant matte tin finish, and standard JEDEC MS-012AC footprint (5.3mm × 5.3mm × 1.75mm). Pin 1 marked by laser dot; pin 1 ID corner matches industry-standard orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions; initiates self-timed programming on falling edge. |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-sequence for host flexibility. |
| DI | Data Input | Receives Start bit, instruction opcodes, address bits, and write data; shares net with DO only with series resistor to avoid bus conflict. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or after status polling completes. |
| VSS | Ground | Reference for all I/O and internal circuitry; requires low-impedance connection to system ground plane. |
| NC | No Internal Connection | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice - not used for ORG or other functions. |
| VCC | Power Supply | Supplies core logic and charge pump; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or firmware delay loops - host polls DO pin for completion confirmation. |
| Automatic ERAL before WRAL | Ensures full memory array is erased prior to bulk write, preventing data corruption without requiring separate erase command. |
| Power-On/Off Data Protection | Hardware-level VCC monitoring disables writes below 1.5V threshold, preventing partial writes during brown-out or power ramp. |
| EWEN/EWDS Write Lock | Enables secure write gating: device powers up in EWDS state; explicit EWEN required before any erase/write operation. |
| Sequential Read Mode | Allows continuous read across memory addresses with single CS assertion, reducing transaction overhead for block reads. |
Applications
| Automotive Body Control Unit | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angle offsets, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8-bit microcontroller via GPIO-banged Microwire. Use Value: E-grade temperature rating ensures reliable operation in door latch assemblies exposed to cabin heat soak and cold ambient extremes. |
Use Scenario: Holding factory-calibrated gain/offset coefficients for analog sensor front-ends in pressure transmitters. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent parameter storage accessible during boot and field recalibration. Use Value: 1M endurance supports repeated field recalibration over 10+ years without wear-out concerns. |
| Medical Infusion Pump Settings | Smart Energy Meter Configuration |
Use Scenario: Retaining drug library parameters, dose limits, and user preferences across power cycles in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory storing immutable operational constraints and audit logs. Use Value: >200-year data retention meets IEC 62304 software lifecycle requirements for long-lifecycle medical hardware. |
Use Scenario: Storing tariff schedules, metering constants, and communication credentials in ANSI C12.19-compliant utility meters. IC Role / Device Role / Timing Role: Secure configuration store accessed during meter initialization and firmware updates. Use Value: VCC brown-out protection prevents corruption during grid voltage sags common in distribution networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/SN | Same 64×16-bit organization and SOIC-8 package, but rated for Industrial temp (–40°C to +85°C) only; lower max VCC (2.5–5.5V same). | Not qualified for under-hood automotive use; suitable for indoor industrial controllers or consumer appliances. | Select if automotive temperature grade is unnecessary and cost optimization is prioritized. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (8×128), 2.5–5.5V, Industrial temp, 20 MHz SPI interface - faster but incompatible protocol stack. | Requires SPI peripheral and driver changes; lacks Microwire compatibility and ERAL/WRAL auto-erase features. | Choose only when migrating to SPI-based architecture and higher throughput is needed. |
Compared with 93LC46B-I/SN, the 93LC46B-E/SN adds automotive qualification and extended high-temp operation without changing pinout or command set; versus AT25010B-MAHL-T, it retains Microwire simplicity and integrated auto-erase but trades off speed and SPI ecosystem support.
Availability
93LC46B-E/SN is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and medical device manufacturing requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 93LC46B-E/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 93LC46B-E/SN 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 compatibility and automotive reliability are essential.
FAQ
What is the memory organization of the 93LC46B-E/SN?
The 93LC46B-E/SN has a fixed 64 × 16-bit organization (1 Kbit total), with no ORG pin - unlike 'C' variants, it does not support runtime word-size switching. This provides deterministic 16-bit data access ideal for MCU register-mapped configuration storage.
Does the 93LC46B-E/SN require an external high-voltage supply for write operations?
No, the 93LC46B-E/SN integrates an on-chip charge pump that generates the required programming voltage from the standard 2.5–5.5V VCC supply. No external HV source or level-shifter is needed, simplifying board design and reducing BOM count.
How is write protection implemented on the 93LC46B-E/SN?
Write protection is enforced through dual hardware/software mechanisms: (1) VCC brown-out detection disables writes below ~1.5V, and (2) the device powers up in EWDS (Erase/Write Disable) state - an explicit EWEN command must precede any erase or write operation.
What is the maximum clock frequency supported by the 93LC46B-E/SN?
The 93LC46B-E/SN supports up to 2 MHz clock frequency for VCC = 2.5V to 5.5V (per Table 1-2, A1). At 5.5V, the maximum is 3 MHz, but the E-grade qualification applies across the full 2.5–5.5V range, so 2 MHz is the guaranteed max for automotive operation.
Can the 93LC46B-E/SN be used in a shared DI/DO bus configuration?
Yes, but with caution: DI and DO can share a net only when a series resistor (e.g., 10 kΩ) is placed between them to prevent bus conflict during the dummy zero preceding READ. Without this resistor, undefined voltage levels may occur due to simultaneous drive contention.
93LC46B-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 64 x 16
- 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-SOIC
93LC46B-E/SN FAQ
1.How can I place an order for 93LC46B-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46B-E/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 93LC46B-E/SN reliable?
The price and inventory of 93LC46B-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46B-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC46B-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46B-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46B-E/SN?
93LC46B-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46B-E/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 93LC46B-E/SN?
For technical support, including 93LC46B-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46B-E/SN requirements.
6.How does Aetrix verify that 93LC46B-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46B-E/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 93LC46B-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC46B-E/SN?
All 93LC46B-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46B-E/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 93LC46B-E/SN part is unused and in its original packaging.
Return procedure for 93LC46B-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46B-E/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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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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