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Microchip Technology 93C46B-I/SN
- Part No.:
- 93C46B-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C46B-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
93C46B-I/SN from Microchip Technology Inc. is a 1Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and 1,000,000 endurance cycles. Used for configuration storage in embedded controllers and power management ICs.
For engineers reviewing the 93C46B-I/SN datasheet, 93C46B-I/SN pinout, 93C46B-I/SN application, or 93C46B-I/SN equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), 2 ms program cycle time, 4.5–5.5 V operation window, RoHS-compliant SOIC-8 package, and compatibility with legacy Microwire-based microcontroller peripherals.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO pins with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on rising CLK edges, with data output synchronized to CLK and DO doubling as Ready/Busy indicator.
Unlike 'C' variants, the 93C46B has no ORG pin and is permanently configured for 16-bit word access. Its erase/write timing is initiated by the rising edge of CLK on the final data bit, and it requires VCC ≥ 4.5 V for ERAL and WRAL operations. Power-on reset disables write functions until explicit EWEN command is issued.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size & Organization | 1 Kbit (64 × 16-bit); fixed x16 mode - no ORG pin needed, simplifies PCB routing and firmware logic |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with 5 V logic systems; not functional below 4.5 V due to VPOR = 3.8 V |
| Write Cycle Time | 2 ms typical - enables fast field updates without blocking host MCU for extended periods |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration or logging in industrial control applications |
| Data Retention | 200 years at +25°C - ensures long-term reliability in unattended equipment like utility meters |
| Interface Protocol | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® and 8051 peripherals without protocol translation |
| Operating Temperature | –40°C to +85°C (Industrial grade) - validated across full range for use in factory automation and motor drives |
Pinout & Package
8-pin SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. Pins 6 and 7 are unconnected - must be left floating or tied to VSS per layout best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates instruction decode on rising edge |
| CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL defined per VCC |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when CS = low |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal circuitry; requires low-impedance connection to system ground plane |
| NC (Pins 6 & 7) | No Internal Connection | Not bonded internally; must not be connected to any signal or power net to avoid parasitic coupling |
| VCC | Power Supply | 4.5–5.5 V only; VPOR threshold at 3.8 V prevents spurious writes during brown-out conditions |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - host MCU can poll DO or use fixed 2 ms delay |
| Automatic ERAL before WRAL | Guarantees clean memory state before bulk write; removes requirement for separate ERAL command in firmware |
| Ready/Busy via DO pin | Enables non-blocking polling - frees MCU resources versus fixed-delay wait loops |
| Power-On/Off Data Protection | Hardware lockout below 3.8 V prevents corruption during power ramp-up/down or glitches |
| Industry Standard Microwire Interface | Reduces firmware porting effort across Microchip 8/16-bit MCUs and third-party controllers with native Microwire support |
Applications
| Industrial Sensor Calibration | Motor Drive Configuration |
|---|---|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in programmable sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at power-up and during field recalibration. Use Value: Enables single-device calibration across production batches; 200-year retention ensures accuracy over product lifetime without battery backup. |
Use Scenario: Holding motor phase timing profiles, current limit thresholds, and fault recovery parameters in BLDC driver modules. IC Role / Device Role / Timing Role: Persistent parameter store read at boot and updated during commissioning or adaptive tuning. Use Value: 64 × 16-bit organization matches common 16-bit register maps; 2 ms write time allows real-time parameter adjustment without interrupt latency penalties. |
| Power Supply Sequencing | Legacy Industrial Controller |
Use Scenario: Storing startup voltage ramp rates, rail enable order, and fault timeout values in multi-rail AC/DC PSUs. IC Role / Device Role / Timing Role: Configuration memory interfaced directly to supervisor IC or small MCU managing power sequencing logic. Use Value: 4.5–5.5 V operation aligns with 5 V supervisor rails; NC pins simplify layout in space-constrained PSU PCBs. |
Use Scenario: Replacing obsolete 93C46B variants in aging PLC I/O modules requiring drop-in EEPROM replacement. IC Role / Device Role / Timing Role: Pin- and function-compatible serial EEPROM supporting existing Microwire firmware stack. Use Value: Identical SOIC-8 footprint and instruction set ensures zero hardware or software changes during component obsolescence mitigation. |
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 | Wider VCC range (2.5–5.5 V); same 64 × 16-bit organization and SOIC-8 package | Supports 3.3 V systems; lacks 4.5 V minimum - unsuitable for strict 5 V-only designs | Select if migrating to mixed-voltage or low-power systems; verify VCC stability during write cycles |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8-bit), 1.8–5.5 V, same industrial temp grade and SOIC-8 | Requires SPI master instead of Microwire; 8-bit organization demands firmware rework for address/data handling | Choose only when upgrading to SPI ecosystem; not a drop-in replacement due to protocol and word-size mismatch |
Compared with 93LC46B-I/SN, the 93C46B-I/SN offers tighter VCC tolerance ideal for stable 5 V rails but sacrifices low-voltage flexibility; versus AT25010B-MAHL-T, it preserves legacy Microwire firmware and 16-bit efficiency at the cost of modern SPI feature sets like write protection registers.
Availability
93C46B-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, motor drive configuration, and power supply sequencing requiring stable component supply across extended production lifecycles.
Supply support for 93C46B-I/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 93C46B-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource overhead.
FAQ
What is the memory organization of the 93C46B-I/SN?
The 93C46B-I/SN has a fixed 64 × 16-bit (1 Kbit) organization. Unlike 'C' variants, it does not have an ORG pin - the 16-bit word size is hardwired. This eliminates external configuration logic and simplifies firmware address mapping for 16-bit data structures. The 93C46B-I/SN delivers deterministic 16-bit reads/writes without runtime mode selection.
Does the 93C46B-I/SN require an external pull-up resistor on the DO pin?
No, the 93C46B-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when CS is low or during non-read operations. A pull-up may cause bus contention if DI and DO are shorted - Microchip recommends a series resistor if shared-bus topology is used, but not a pull-up.
What is the minimum VCC required for reliable write operation of the 93C46B-I/SN?
The 93C46B-I/SN requires VCC ≥ 4.5 V for all write, erase, ERAL, and WRAL operations. Its power-on reset threshold (VPOR) is 3.8 V, meaning write functions are hardware-disabled below 4.5 V to prevent data corruption. Operation at 4.4 V or lower will result in failed programming attempts and undefined DO status behavior.
Can the 93C46B-I/SN be used in a 3.3 V system?
No, the 93C46B-I/SN is not rated for 3.3 V operation. Its specified VCC range is strictly 4.5–5.5 V. For 3.3 V systems, consider the 93LC46B-I/SN (2.5–5.5 V) or 93AA46B-I/SN (1.8–5.5 V), both of which share identical 64 × 16-bit organization and SOIC-8 packaging but differ in voltage thresholds and endurance specs.
How is the Ready/Busy status monitored on the 93C46B-I/SN?
Ready/Busy status is monitored on the DO pin: DO = low indicates ongoing erase/write operation; DO = high indicates completion. To sample status, CS must be brought high for ≥250 ns after the command completes, then DO is sampled on the next CLK rising edge. The 93C46B-I/SN does not support status polling while CS remains low.
93C46B-I/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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C46B-I/SN FAQ
1.How can I place an order for 93C46B-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46B-I/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-I/SN reliable?
The price and inventory of 93C46B-I/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-I/SN is usually 5 days.
3.What payment methods are accepted for 93C46B-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46B-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46B-I/SN?
93C46B-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46B-I/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-I/SN?
For technical support, including 93C46B-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46B-I/SN requirements.
6.How does Aetrix verify that 93C46B-I/SN is sourced from the original manufacturer or authorized distributors?
All 93C46B-I/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-I/SN meets industry standards.
7.What is the process for return or replacement of 93C46B-I/SN?
All 93C46B-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C46B-I/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-I/SN part is unused and in its original packaging.
Return procedure for 93C46B-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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