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Microchip Technology 93C46BT/SN
- Part No.:
- 93C46BT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46BT/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,842
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Product details
Overview
93C46BT/SN from Microchip Technology Inc. is a 1K-bit (128 × 8) Microwire-compatible serial EEPROM with dedicated 8-bit organization, 4.5–5.5 V supply range, industrial temperature grade (–40°C to +85°C), and SOIC-8 (SN) package. It features self-timed erase/write cycles, automatic ERAL/WRAL support, Ready/Busy status via DO pin, and power-on/off data protection - deployed in embedded system configuration storage, sensor calibration memory, and legacy industrial controller firmware parameter retention.
For engineers reviewing the 93C46BT/SN datasheet, 93C46BT/SN pinout, 93C46BT/SN application, or 93C46BT/SN equivalent, this page delivers verified electrical specs (e.g., TWC = 2 ms write cycle), package mapping (SOIC-8), functional timing behavior (CS/CLK/DI/DO protocol), and real-world substitution guidance for legacy Microwire EEPROM migration.
Technical Context
The 93C46BT/SN implements a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (dedicated x8 mode). Its internal architecture includes an address decoder, data register, and output buffer, enabling sequential read and auto-erase-before-write operation without external erase commands.
It operates exclusively in 4.5–5.5 V VCC range and requires ≥4.5 V for ERAL and WRAL functions. The device powers up in EWDS (Erase/Write Disable) state and mandates EWEN before any programming; DO pin serves dual role as data output and Ready/Busy indicator during erase/write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization, fixed - no ORG pin) |
| VCC operating range | 4.5 V to 5.5 V - must be ≥4.5 V for ERAL/WRAL execution |
| Write cycle time (TWC) | 2 ms - self-timed erase-and-write; no external delay needed |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V |
| Data retention | Greater than 200 years - specified under normal operating conditions |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C compatibility |
| Temperature grade | Industrial (I): –40°C to +85°C - not rated for automotive (E) use |
Pinout & Package
93C46BT/SN is supplied in 8-lead SOIC (SN) package per Microchip's standard outline. 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; pin 8 is VCC. All NC pins must be left unconnected or tied to VSS per design guidelines.
| 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 |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence |
| 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 when CS is low |
| VSS (Pin 5) | Ground | Reference for all logic and analog circuitry - must be low-impedance connection |
| NC (Pin 6) | No Internal Connection | Unused - must remain floating or tied to VSS; not ORG (A/B versions lack ORG) |
| NC (Pin 7) | No Internal Connection | Unused - must remain floating or tied to VSS |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V only - voltage detect threshold is 3.8 V; below this, all operations inhibited |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - 2 ms guaranteed completion (93C version) |
| Automatic ERAL before WRAL | WRAL instruction internally executes full array erase prior to write - no separate ERAL command required |
| Power-on/off data protection | Hardware-level lockout below 3.8 V VCC - prevents corruption during brown-out or power ramp |
| Ready/Busy status via DO | Enables polling-based firmware flow control without interrupt or additional pins |
| 1M endurance / 200-year retention | Validated for long-life industrial deployments - e.g., field-replaceable module calibration storage |
Applications
| Industrial Controller Configuration Storage | Legacy Sensor Calibration Memory |
|---|---|
Use Scenario: Storing PID tuning parameters, I/O mapping, and alarm thresholds in PLC backplane modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during commissioning or maintenance. Use Value: Ensures parameter persistence across 10+ year deployments without battery backup or refresh cycles. |
Use Scenario: Retaining factory-trimmed offset/gain coefficients for analog temperature sensors in HVAC equipment. IC Role / Device Role / Timing Role: One-time-programmable (OTP)-like storage with field-updatable capability via service port. Use Value: Enables post-manufacturing calibration traceability and field recalibration without MCU firmware changes. |
| Embedded System Bootloader Parameter Table | Legacy Automotive Body Control Module (BCM) Settings |
Use Scenario: Holding bootloader jump addresses, secure boot flags, and firmware version metadata in microcontroller-based gateways. IC Role / Device Role / Timing Role: Read-on-reset memory mapped via GPIO-banged Microwire interface. Use Value: Provides deterministic boot configuration independent of main flash wear or corruption. |
Use Scenario: Storing seat position presets, mirror fold/unfold settings, and lighting profiles in pre-2010 BCM designs. IC Role / Device Role / Timing Role: Low-pin-count nonvolatile memory interfaced directly to 8-bit microcontrollers with limited peripherals. Use Value: Maintains user preferences across vehicle battery disconnects without CAN-based NVM overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C46B/SN | Dedicated 16-bit (64 × 16) organization; same VCC range, package, and timing | Requires 16-bit data path and address handling - incompatible with existing 8-bit firmware interfaces | Select only if migrating to wider word access and redesigning host driver logic |
| 93LC46A-I/SN | Lower VCC range (2.5–5.5 V); identical 8-bit organization and SOIC-8 package | Supports wider supply tolerance - suitable for mixed-voltage systems but lacks 4.5–5.5 V optimization | Prefer for new designs needing single-supply flexibility; verify brown-out immunity at 2.5 V |
Compared with 93C46B/SN, the 93C46BT/SN ensures drop-in compatibility for 8-bit Microwire systems with strict 5 V rails; versus 93LC46A-I/SN, it trades supply flexibility for enhanced noise margin and guaranteed ERAL/WRAL operation at nominal 5 V.
Availability
93C46BT/SN is available at Aetrix Electronics and suitable for industrial controller configuration storage, legacy sensor calibration memory, and embedded system bootloader parameter tables requiring stable component supply across extended product lifecycles.
Supply support for 93C46BT/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 93C46BT/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count Microwire-based nonvolatile storage in industrial and automotive-adjacent applications where SPI/I²C were unavailable or over-specified.
FAQ
What is the memory organization of the 93C46BT/SN?
The 93C46BT/SN has a fixed 128 × 8-bit (1K-bit) organization. Unlike 'C' variants, it lacks an ORG pin and is not configurable - it operates exclusively in 8-bit mode. This is confirmed in the Device Selection Table where '93C46A' entries specify 'No' for ORG pin and '8-bit' word size. The 'T' suffix denotes tape-and-reel packaging, and 'SN' confirms SOIC-8 package.
Does the 93C46BT/SN support 16-bit operation?
No, the 93C46BT/SN does not support 16-bit operation. It is an 'A'-suffix device (93C46A), meaning it has dedicated 8-bit organization and no ORG pin. Only 'B' (93C46B) and 'C' (93C46C) variants support 16-bit mode - the former permanently, the latter via ORG pin. Attempting 16-bit read/write sequences on 93C46BT/SN will result in incorrect addressing or data corruption.
What is the minimum VCC required for ERAL and WRAL operations on the 93C46BT/SN?
The 93C46BT/SN requires VCC ≥ 4.5 V for proper execution of ERAL (Erase All) and WRAL (Write All) instructions. This is explicitly stated in the datasheet: "VCC must be ≥4.5V for proper operation of ERAL" and "VCC must be ≥4.5V for proper operation of WRAL". Below 4.5 V, these commands will fail silently or produce undefined behavior - the device inhibits all programming modes below its 3.8 V voltage detect threshold.
How is Ready/Busy status monitored on the 93C46BT/SN?
Ready/Busy status on the 93C46BT/SN is monitored by polling the DO pin after bringing CS high for ≥250 ns (TCSL) following initiation of an erase or write cycle. DO = low indicates ongoing operation; DO = high indicates completion. DO returns to High-Z when CS is low. This behavior is distinct from interrupt-driven status and requires firmware polling - no dedicated BUSY pin exists.
Is the 93C46BT/SN RoHS compliant and lead-free?
Yes, the 93C46BT/SN is RoHS compliant and features a Pb-free Matte Tin (Sn) finish, as confirmed in the "Features" section and Packaging Information. All packages listed for the 93XX46 series - including SOIC (SN) - are explicitly noted as Pb-free. The 'SN' package code itself denotes the standard RoHS-compliant SOIC-8 variant per Microchip's marking conventions.
93C46BT/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
93C46BT/SN FAQ
1.How can I place an order for 93C46BT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46BT/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 93C46BT/SN reliable?
The price and inventory of 93C46BT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C46BT/SN is usually 5 days.
3.What payment methods are accepted for 93C46BT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46BT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46BT/SN?
93C46BT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46BT/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 93C46BT/SN?
For technical support, including 93C46BT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46BT/SN requirements.
6.How does Aetrix verify that 93C46BT/SN is sourced from the original manufacturer or authorized distributors?
All 93C46BT/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 93C46BT/SN meets industry standards.
7.What is the process for return or replacement of 93C46BT/SN?
All 93C46BT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46BT/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 93C46BT/SN part is unused and in its original packaging.
Return procedure for 93C46BT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46BT/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
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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