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Microchip Technology 93C46BXT-E/SN
- Part No.:
- 93C46BXT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46BXT-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,702
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Product details
Overview
93C46BXT-E/SN from Microchip Technology Inc. is a 1 Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial/automotive temperature support (–40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL/WRAL, Ready/Busy status on DO, and RoHS-compliant SOIC-8 packaging. Used for configuration storage in automotive control modules and industrial sensor nodes.
For engineers reviewing the 93C46BXT-E/SN datasheet, 93C46BXT-E/SN pinout, 93C46BXT-E/SN application, or 93C46BXT-E/SN equivalent, key selection criteria include its fixed 16-bit word organization, 2 ms program cycle time, VCC ≥4.5 V requirement for ERAL/WRAL, dual-temp grade support, and compatibility with legacy Microwire controllers in space-constrained embedded systems.
Technical Context
The 93C46BXT-E/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (dedicated 16-bit mode). Its internal architecture includes an address decoder, data register, and auto-erase/write logic that initiates on the rising edge of CLK at the final data bit.
It operates exclusively in 64 × 16-bit organization, supports sequential read, enforces power-on write protection via VCC detect (3.8 V threshold), and requires EWEN before any erase/write. Standby current is ≤5 µA, and all operations are inhibited below VCC = 3.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits); enables compact nonvolatile storage for calibration tables or device IDs. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); requires no I²C or SPI hardware, reducing MCU GPIO count. |
| VCC Range | 4.5 V to 5.5 V; compatible with 5 V logic systems but excludes 3.3 V operation - mandates level-shifting if interfacing with lower-voltage controllers. |
| Program Cycle Time | 2 ms (typical); defines minimum delay between WRITE commands; impacts firmware latency during bulk updates. |
| Data Retention | >200 years at +25°C; ensures long-term reliability in unattended equipment without periodic refresh. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates in diagnostic or logging applications. |
| Temperature Range | –40°C to +125°C (Automotive E-grade); qualified for under-hood or motor-control environments. |
Pinout & Package
93C46BXT-E/SN is housed in an 8-lead SOIC package (SN suffix), measuring 3.9 mm × 4.9 mm × 1.75 mm, with Pb-free Matte Tin (Sn) finish. Pin 1 is marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (≤5 µA ICCS). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-transfer. |
| 3 (DI) | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; tied high with CS to initiate communication. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS is low or after status polling. |
| 5 (VSS) | Ground | Reference return path; must be low-impedance to ensure stable VCC margin and noise immunity. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - no external tie required or recommended. |
| 7 (NC) | No Connect | Internally unconnected; same as Pin 6 - leave unconnected per datasheet guidance. |
| 8 (VCC) | Power Supply | 4.5–5.5 V input; includes internal POR circuit triggering at ~3.8 V; powers all logic and memory cells. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 16-bit word organization | Eliminates external ORG pin routing and configuration logic - simplifies PCB layout and firmware initialization. |
| Self-timed erase/write with auto-erase | Removes need for external timing control; firmware only waits for DO=high or polls status - reduces CPU overhead. |
| ERAL and WRAL instructions | Enables full-array erase or program in single command (6 ms and 15 ms respectively), accelerating factory provisioning. |
| VCC-dependent write protection | Hardware lockout below 3.8 V prevents corruption during brown-out or power ramp - no software watchdog needed. |
| Ready/Busy status on DO | Allows real-time progress monitoring without additional pins; avoids fixed delays and improves system responsiveness. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing fuel map coefficients and fault-code history in engine management systems subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8051 or ARM-based ECU microcontrollers via Microwire. Use Value: 125°C rating ensures operation near exhaust manifolds; 1M endurance supports recalibration over vehicle lifetime. |
Use Scenario: Holding I/O module calibration offsets and network node identifiers in modular automation controllers. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent parameter storage independent of main processor boot sequence. Use Value: 2 ms write time enables fast commissioning; VCC lockout prevents corruption during AC line dips. |
| Medical Infusion Pump Settings | Smart Meter Firmware Patch Storage |
Use Scenario: Retaining drug library parameters and dosage limits in battery-backed portable infusion devices. IC Role / Device Role / Timing Role: Secure, low-power memory storing safety-critical operational constraints accessed at startup. Use Value: >200-year data retention meets FDA long-term traceability requirements; RoHS compliance satisfies medical directives. |
Use Scenario: Storing encrypted firmware patches and cryptographic keys for remote utility meter updates. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage holding update payloads prior to secure execution. Use Value: ERAL/WRAL support enables atomic full-memory reprogramming; 5.5 V max rating aligns with meter power rails. |
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-bit organization and SOIC-8 package, but rated only for –40°C to +85°C (I-temp), not automotive E-temp. | Lacks AEC-Q100 qualification and 125°C operation - unsuitable for under-hood or motor-drive locations. | Select only for cost-sensitive industrial or consumer applications where ambient temperature stays ≤85°C. |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5 V supply, 5 MHz clock, and 5 ms write time - no Microwire compatibility. | Requires different MCU peripheral (SPI vs Microwire) and firmware driver; incompatible opcode set and timing. | Choose only when migrating to SPI-based platforms or needing wider VCC range - not a drop-in replacement. |
Compared with 93C46B-I/SN, the 93C46BXT-E/SN adds automotive-grade temperature qualification and enhanced reliability testing; compared with AT25010B-SSHL-T, it preserves legacy Microwire infrastructure but trades off higher clock speed and broader voltage support for pin- and protocol-level compatibility.
Availability
93C46BXT-E/SN is available at Aetrix Electronics and suitable for automotive control units, industrial programmable logic controllers, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93C46BXT-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 93Cxx series was designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage - targeting automotive, industrial, and consumer applications where Microwire compatibility and robustness are critical.
FAQ
What is the memory organization of the 93C46BXT-E/SN?
The 93C46BXT-E/SN has a fixed 64 × 16-bit organization - meaning it stores 64 words, each 16 bits wide. Unlike 'C' variants, it lacks an ORG pin and does not support 8-bit mode. This configuration is hardwired and requires no external configuration logic, simplifying integration into Microwire-based systems.
Does the 93C46BXT-E/SN require an external pull-up resistor on the DO pin?
No, the 93C46BXT-E/SN does not require an external pull-up on DO. The DO pin actively drives high/low during read or status polling and enters High-Z when CS is low or after status is cleared. However, a 10 kΩ pull-down on CS is recommended per datasheet Section 2.3 for added noise immunity.
What is the minimum VCC required for write operations on the 93C46BXT-E/SN?
The 93C46BXT-E/SN requires VCC ≥ 4.5 V for all write, erase, ERAL, and WRAL operations. Its internal voltage detector disables programming below ~3.8 V to prevent data corruption - this is a hardware-enforced lockout, not a recommendation.
Can the 93C46BXT-E/SN be used with a 3.3 V microcontroller?
No - the 93C46BXT-E/SN operates only from 4.5 V to 5.5 V and is not 3.3 V tolerant. Interfacing with a 3.3 V MCU requires bidirectional level translation on CS, CLK, DI, and DO lines, and a separate 5 V supply rail. Direct connection risks damage or unreliable operation.
How is the Ready/Busy status monitored on the 93C46BXT-E/SN?
After initiating an erase or write command, bring CS high for ≥250 ns (TCSL), then sample DO: low = busy, high = ready. The status remains valid until CS is brought low again. Issuing a Start bit followed by CS low clears the status flag and returns DO to High-Z.
93C46BXT-E/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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C46BXT-E/SN FAQ
1.How can I place an order for 93C46BXT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BXT-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 93C46BXT-E/SN reliable?
The price and inventory of 93C46BXT-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 93C46BXT-E/SN is usually 5 days.
3.What payment methods are accepted for 93C46BXT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BXT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BXT-E/SN?
93C46BXT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BXT-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 93C46BXT-E/SN?
For technical support, including 93C46BXT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BXT-E/SN requirements.
6.How does Aetrix verify that 93C46BXT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C46BXT-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 93C46BXT-E/SN meets industry standards.
7.What is the process for return or replacement of 93C46BXT-E/SN?
All 93C46BXT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BXT-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 93C46BXT-E/SN part is unused and in its original packaging.
Return procedure for 93C46BXT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46BXT-E/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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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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