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Microchip Technology 93C46BXT/SN
- Part No.:
- 93C46BXT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46BXT/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,836
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Product details
Overview
93C46BXT/SN from Microchip Technology Inc. is a 1K-bit (64 × 16-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, Ready/Busy status signaling via DO pin, and 1,000,000 endurance cycles. Used for nonvolatile configuration storage in embedded microcontroller systems.
For engineers reviewing the 93C46BXT/SN datasheet, 93C46BXT/SN pinout, 93C46BXT/SN application, or 93C46BXT/SN equivalent, key selection criteria include its fixed 16-bit word organization (no ORG pin), 2 ms program cycle time, RoHS-compliant SOIC-8 package (SN), and compatibility with legacy Microwire controllers requiring strict timing compliance at 5 V.
Technical Context
The 93C46BXT/SN implements a synchronous serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-driven command execution. Its internal architecture includes an address decoder, data register, mode decode logic, and output buffer, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions.
Unlike C-variant parts, the 93C46BXT/SN lacks an ORG pin and is hardwired for x16 organization - all instructions operate on 16-bit data words. Write initiation uses the rising edge of CLK on the final data bit, and VCC must be ≥4.5 V for ERAL and WRAL operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (64 × 16-bit organization) |
| VCC range | 4.5 V to 5.5 V - requires stable 5 V rail; no operation below 4.5 V due to VPOR = 3.8 V |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C protocol support |
| Write cycle time | 2 ms - self-timed; eliminates need for external timing control during programming |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V per Total Endurance™ Model |
| Data retention | 200 years - guaranteed minimum retention under industrial temperature conditions |
| Temperature range | –40°C to +85°C (Industrial grade) - qualified per AEC-Q100 not required; automotive E-temp not supported |
Pinout & Package
93C46BXT/SN is supplied in an 8-lead SOIC package (SN suffix), Pb-free Matte Tin finish, with standard pinout and no ORG pin (fixed x16 mode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates standby when low |
| 2: CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stops freely during transmission |
| 3: DI | Data Input | Accepts start bit, instruction opcodes, addresses, and write data; high impedance when not selected |
| 4: DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| 5: VSS | Ground | Reference return path for all signals and power; 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; same handling as Pin 6 |
| 8: VCC | Power Supply | 4.5–5.5 V supply input; bypass capacitor (0.1 µF) required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry; device manages internal charge pump and verification autonomously |
| Ready/Busy status on DO | Enables polling-based firmware flow control without interrupt or timeout overhead |
| Automatic ERAL before WRAL | Guarantees full array erasure prior to bulk write, preventing partial-data corruption |
| Power-on/off data protection | Hardware-level lockout below VPOR (3.8 V) prevents spurious writes during brown-out or startup |
| 1,000,000 endurance cycles | Supports frequent field updates in calibration, logging, or configuration applications over product lifetime |
Applications
| Industrial Sensor Calibration | Microcontroller Configuration Storage |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC or process control transmitters. IC Role / Device Role / Timing Role: Nonvolatile memory holding persistent calibration parameters accessed at boot by host MCU. Use Value: Ensures measurement accuracy across power cycles and temperature ranges without battery backup. | Use Scenario: Retaining user-defined settings (baud rate, I/O mapping, alarm thresholds) in programmable logic controllers. IC Role / Device Role / Timing Role: Serial configuration EEPROM interfaced directly to MCU GPIO or hardware Microwire peripheral. Use Value: Enables field-upgradable system behavior without firmware reflash or external programming tools. |
| Legacy Industrial Controller Firmware Patch | Power Meter Communication Module |
Use Scenario: Storing small firmware patches or protocol stack updates in aging PLC backplanes with limited flash space. IC Role / Device Role / Timing Role: Read-only patch store accessed via fixed-address sequential read after MCU boot. Use Value: Extends product service life by enabling post-deployment bug fixes without hardware revision. | Use Scenario: Holding DLMS/COSEM communication profile identifiers and encryption keys in ANSI C12.19-compliant meters. IC Role / Device Role / Timing Role: Secure nonvolatile storage for metering-specific credentials with hardware write-protection (EWDS/EWEN). Use Value: Meets utility-grade data integrity requirements while minimizing BOM cost vs. secure flash alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46B-I/SN | Same 64×16 organization, identical SOIC-8 package and pinout, but marked per older Microchip ID system (no 'XT' suffix) | No functional difference; legacy marking variant - fully interchangeable in new designs | Select 93C46BXT/SN for guaranteed latest wafer lot and packaging compliance (RoHS, Matte Tin) |
| AT93C46-10SU-2.7 | 1K-bit x16 EEPROM with wider 2.7–5.5 V VCC range; SPI-compatible interface (not Microwire); different instruction set and timing | Requires firmware driver rewrite; supports lower-voltage operation but lacks ERAL/WRAL auto-erase guarantee | Choose only if system operates below 4.5 V or requires SPI bus sharing; not drop-in compatible |
Compared with 93C46B-I/SN, the 93C46BXT/SN offers updated traceability and packaging compliance, while AT93C46-10SU-2.7 enables lower-voltage operation at the cost of interface and command-set incompatibility.
Availability
93C46BXT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, microcontroller configuration storage, and legacy controller firmware patching requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 93C46BXT/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93C46BXT/SN belongs to Microchip's legacy 93Cxx serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal external components and Microwire protocol compatibility.
FAQ
What is the memory organization of the 93C46BXT/SN?
The 93C46BXT/SN has a fixed 64 × 16-bit organization (1 Kbit total), with no ORG pin - it is a 'B'-suffix device and always operates in x16 mode. Unlike 'C' variants, it does not support runtime word-size selection. This configuration is confirmed in the Device Selection Table and Pin Function Table of DS20001749K, where ORG is listed as NC for 93C46B parts.
Does the 93C46BXT/SN support 3.3 V operation?
No, the 93C46BXT/SN does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, and its power-on reset threshold (VPOR) is 3.8 V. Operation below 4.5 V risks incomplete writes or data corruption. For 3.3 V systems, consider the 93LC46B or 93AA46B variants instead.
How is the Ready/Busy status signaled on the 93C46BXT/SN?
The 93C46BXT/SN signals Ready/Busy status on the DO pin: DO = low indicates ongoing erase/write operation; DO = high indicates completion. To read status, CS must be brought high for ≥250 ns after TCSL, then sampled. The DO pin returns to High-Z on CS falling edge, per Section 3.4 of DS20001749K.
What is the maximum clock frequency supported by the 93C46BXT/SN?
The 93C46BXT/SN supports a maximum clock frequency of 3 MHz when VCC is 4.5–5.5 V, as specified in Table 1-2 (A1 parameter). This applies to all instructions including READ, WRITE, and ERASE. Timing margins (TCKH, TCKL, TDIS, etc.) must also be met - e.g., minimum clock high time is 200 ns at 5 V.
Is the 93C46BXT/SN pin-compatible with other 93C46 variants?
Yes, the 93C46BXT/SN is pin-compatible with all 8-lead SOIC-packaged 93C46 variants (e.g., 93C46A, 93C46C) in the same package type (SN), sharing identical pinout per Package Types diagram on page 2 of DS20001749K. However, functional differences exist - e.g., 93C46A is x8-only, 93C46C has ORG pin - so PCB layout reuse requires verifying signal routing and ORG handling.
93C46BXT/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C46BXT/SN FAQ
1.How can I place an order for 93C46BXT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BXT/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 93C46BXT/SN reliable?
The price and inventory of 93C46BXT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46BXT/SN is usually 5 days.
3.What payment methods are accepted for 93C46BXT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BXT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BXT/SN?
93C46BXT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BXT/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 93C46BXT/SN?
For technical support, including 93C46BXT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BXT/SN requirements.
6.How does Aetrix verify that 93C46BXT/SN is sourced from the original manufacturer or authorized distributors?
All 93C46BXT/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 93C46BXT/SN meets industry standards.
7.What is the process for return or replacement of 93C46BXT/SN?
All 93C46BXT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BXT/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 93C46BXT/SN part is unused and in its original packaging.
Return procedure for 93C46BXT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46BXT/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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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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