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Microchip Technology 93C46B-E/SN
- Part No.:
- 93C46B-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46B-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,895
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Product details
Overview
93C46B-E/SN from Microchip Technology Inc. is a 1Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status signaling via DO pin, and >200-year data retention - used for configuration storage in automotive control modules and industrial sensor nodes.
For engineers reviewing the 93C46B-E/SN datasheet, 93C46B-E/SN pinout, 93C46B-E/SN application, or 93C46B-E/SN equivalent, key selection criteria include its fixed 16-bit word organization (no ORG pin), 2 ms write cycle time, VCC ≥4.5V requirement for ERAL/WRAL, RoHS-compliant SOIC-8 package (SN), and compatibility with legacy Microwire host controllers requiring deterministic timing and hardware-level data protection.
Technical Context
The 93C46B-E/SN implements a synchronous serial interface with CS, CLK, and DI/DO pins, operating exclusively in 16-bit mode (no ORG pin function). Its instruction set includes READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS - all initiated by a Start bit followed by opcode and address/data on rising CLK edges.
Write operations are self-timed: for 93C46B devices, the rising edge of CLK on the final data bit triggers auto-erase-and-write; ERAL and WRAL require VCC ≥4.5V and complete in 6 ms and 15 ms respectively. Power-on reset detection occurs at ~3.8V, and the device powers up in EWDS (Erase/Write Disable) state for inherent data protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (64 words × 16 bits) - supports compact firmware parameter storage without external address latching |
| VCC range | 4.5V to 5.5V - compatible with 5V logic systems and rejects brown-out corruption below 3.8V |
| Write cycle time | 2 ms (typical) - enables fast field updates while maintaining EEPROM endurance |
| Endurance | 1,000,000 erase/write cycles - suitable for applications requiring frequent calibration or logging |
| Data retention | >200 years at +25°C - ensures long-term reliability in unpowered automotive or industrial deployments |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware |
| Temperature range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain control environments |
Pinout & Package
93C46B-E/SN is packaged in an 8-lead SOIC (SN) with Pb-free Matte Tin finish. 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); pin 7 is NC; pin 8 is VCC. The ORG pin is absent - confirming fixed 16-bit organization per device family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable: must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers on rising edge; clock can pause mid-transfer; rising edge on final data bit initiates write on 93C46B |
| DI (Pin 3) | Data Input | Accepts Start bit, opcodes, addresses, and 16-bit write data; requires setup/hold timing relative to CLK |
| DO (Pin 4) | Data Output / Status | Outputs 16-bit read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read states |
| VSS (Pin 5) | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance for reliable timing |
| NC (Pin 6 & 7) | No Connection | Unused terminals - no internal bond wire; must remain unconnected or tied to VSS per layout best practice |
| VCC (Pin 8) | Power Supply | 4.5–5.5V supply; internal POR activates at ~3.8V; powers internal charge pump for write/erase operations |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 16-bit organization | Eliminates need for external ORG pin control logic - simplifies PCB routing and firmware initialization |
| Self-timed write with rising-edge trigger | Removes software wait-state overhead: host only needs to assert CLK edge and poll DO for completion |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents partial-data corruption during firmware update sequences |
| Hardware data protection | Power-on reset lockout below 3.8V + default EWDS state prevent accidental writes during power ramp or noise events |
| RoHS-compliant SOIC-8 | Enables drop-in replacement in existing 5V industrial designs while meeting environmental compliance requirements |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing trim values, fault codes, and calibration tables in engine management systems subject to wide thermal cycling and vibration. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8051 or PIC MCU via Microwire; accessed during boot and runtime diagnostics. Use Value: 125°C rating ensures operation near exhaust manifolds; 1M endurance supports lifetime recalibration; ERAL/WRAL streamline OTA update workflows. | Use Scenario: Retaining I/O mapping, PID tuning parameters, and user-defined logic states across power cycles in modular automation controllers. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent storage for configuration registers, isolated from main processor bus to reduce noise coupling. Use Value: Fixed 16-bit interface aligns with PLC register word size; 2 ms write time enables rapid parameter save during maintenance mode; SOIC-8 eases hand-soldering in low-volume production. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Holding factory-calibrated flow rate coefficients and safety thresholds in battery-powered infusion pumps requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory storing critical calibration constants accessed only during service mode with authenticated host commands. Use Value: >200-year data retention meets ISO 13485 long-term archiving requirements; EWEN/EWDS commands enforce write authorization; 5V operation matches legacy pump MCU voltage rails. | Use Scenario: Storing firmware patch images and cryptographic keys for secure over-the-air updates in utility-grade electricity meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Secondary nonvolatile memory holding encrypted update payloads until verified and applied by meter's secure bootloader. Use Value: 125°C rating withstands summer ambient extremes in pole-mounted meters; WRAL command enables atomic full-firmware replacement; RoHS compliance satisfies EU WEEE directives. |
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 | 2.5–5.5V VCC range; Industrial (−40°C to +85°C) grade only; same 64×16 organization and pinout | Lacks automotive qualification; unsuitable for under-hood use where >85°C ambient occurs | Select if cost-sensitive industrial design operates strictly within 2.5–5.5V and ≤85°C ambient |
| AT25010B-MAHL-T | SPI interface (4-wire), 1.8–5.5V, 128×8 organization; no ERAL/WRAL; 5 ms write time | Requires different host driver stack; lacks bulk-erase-before-write guarantee; lower endurance (100k cycles) | Choose only if migrating to SPI infrastructure and accepting reduced write speed and no automatic ERAL |
Compared with 93LC46B-I/SN, 93C46B-E/SN provides automotive temperature qualification and higher VCC immunity; compared with AT25010B-MAHL-T, it offers deterministic Microwire timing, guaranteed ERAL-before-WRAL, and 10× higher endurance - critical for safety-critical or high-reliability firmware storage.
Availability
93C46B-E/SN is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for 93C46B-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed specifically for cost-sensitive, high-reliability nonvolatile storage in automotive and industrial systems requiring Microwire compatibility, robust power-supply immunity, and long-term data integrity without external supervision.
FAQ
What is the memory organization of the 93C46B-E/SN and does it support dynamic word-size selection?
The 93C46B-E/SN has a fixed 64 × 16-bit (1Kbit) organization and does not support dynamic word-size selection. Unlike 'C' variants (e.g., 93C46C), the 'B' suffix indicates absence of the ORG pin - confirmed by the Pin Function Table stating "ORG pin is NC on A/B devices." This eliminates external configuration logic and guarantees consistent 16-bit data transfers in all operational modes of the 93C46B-E/SN.
What is the minimum VCC required for reliable operation of the 93C46B-E/SN, and how does power-on reset behave?
The 93C46B-E/SN requires VCC ≥4.5V for full functionality, including ERAL and WRAL commands. Its internal power-on reset (POR) circuit activates at approximately 3.8V - below this threshold, all operations (including reads) are inhibited to prevent data corruption. This POR threshold is higher than that of 93AA/93LC variants (1.5V), reflecting the 93C46B-E/SN's optimization for stable 5V systems rather than ultra-low-voltage operation.
How does the 93C46B-E/SN indicate Ready/Busy status during write operations, and what timing constraints apply?
The 93C46B-E/SN signals Ready/Busy status on the DO pin: DO = low indicates active erase/write, DO = high indicates completion. To read status, CS must be brought high for ≥250 ns after the write initiation (TCSL), then DO sampled on subsequent CLK edges. DO returns to High-Z when CS is low - so status polling requires controlled CS toggling. This behavior is identical across all 93C46x variants and is explicitly defined in Figures 2-8 and 2-9 of the datasheet for the 93C46B-E/SN.
What packaging and compliance certifications apply to the 93C46B-E/SN part number?
The 93C46B-E/SN is supplied in an 8-lead SOIC package (SN designation) with Pb-free Matte Tin (Sn) finish, compliant with RoHS Directive 2011/65/EU. The 'E' suffix denotes Automotive temperature grade (−40°C to +125°C), and the 'SN' suffix confirms the SOIC-8 body variant per Microchip's packaging nomenclature in DS20001749K-page 14. No additional certifications (e.g., AEC-Q100) are claimed in the provided documentation for the 93C46B-E/SN.
Can the 93C46B-E/SN be used interchangeably with the 93C46A-E/SN in a design?
No - the 93C46B-E/SN and 93C46A-E/SN are not interchangeable due to fundamental memory organization differences. The 93C46B-E/SN is 64 × 16-bit (16-bit word access), while the 93C46A-E/SN is 128 × 8-bit (8-bit word access). This affects address width, data bus width, and instruction timing (e.g., READ requires 18 vs. 18 CLK cycles but outputs 16 vs. 8 bits). Firmware and hardware must be redesigned to match the word size - the 93C46B-E/SN cannot substitute for the 93C46A-E/SN without system-level changes.
93C46B-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:
- 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-SOIC
93C46B-E/SN FAQ
1.How can I place an order for 93C46B-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46B-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 93C46B-E/SN reliable?
The price and inventory of 93C46B-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 93C46B-E/SN is usually 5 days.
3.What payment methods are accepted for 93C46B-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46B-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46B-E/SN?
93C46B-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46B-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 93C46B-E/SN?
For technical support, including 93C46B-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46B-E/SN requirements.
6.How does Aetrix verify that 93C46B-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C46B-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 93C46B-E/SN meets industry standards.
7.What is the process for return or replacement of 93C46B-E/SN?
All 93C46B-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46B-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 93C46B-E/SN part is unused and in its original packaging.
Return procedure for 93C46B-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46B-E/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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