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Microchip Technology 93C46B-E/ST
- Part No.:
- 93C46B-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C46B-E/ST.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,768
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Product details
Overview
93C46B-E/ST 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/WRAL, Ready/Busy status via DO pin, and 1,000,000 endurance cycles - used for configuration storage in automotive control modules.
For engineers reviewing the 93C46B-E/ST datasheet, 93C46B-E/ST pinout, 93C46B-E/ST application, or 93C46B-E/ST equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), automotive-grade qualification, 2 ms program cycle time, RoHS-compliant SOIC-8 package (ST), and compatibility with legacy Microwire host controllers requiring deterministic timing and hardware data protection.
Technical Context
The 93C46B-E/ST implements a synchronous serial interface with CS, CLK, DI, and DO pins operating at up to 3 MHz (VCC ≥ 4.5 V), using rising-edge clocking for instruction/address/data transfer. Its internal logic enforces strict start-bit detection, auto-erase-before-write, and dedicated EWEN/EWDS commands for write protection.
Unlike C-variant parts, the 93C46B-E/ST has no ORG pin (NC), permanently configured for 64 × 16-bit organization. Erase and write operations are initiated by the rising edge of CLK on the final data bit, and VCC must remain ≥4.5 V for ERAL and WRAL functions to operate correctly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits) - supports compact firmware parameter storage without external address multiplexing. |
| VCC Range | 4.5 V to 5.5 V - compatible with 5 V automotive and industrial power rails; excludes low-voltage operation. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires no I²C pull-ups or SPI mode configuration. |
| Write Cycle Time | 2 ms typical - enables fast field updates without blocking host MCU for extended periods. |
| Endurance | 1,000,000 erase/write cycles - suitable for applications requiring frequent calibration or logging writes. |
| Data Retention | 200 years at +25°C - ensures long-term reliability in unpowered storage scenarios. |
| Temperature Range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood and powertrain control environments. |
Pinout & Package
93C46B-E/ST is housed in an 8-lead SOIC package (ST suffix), with standard pinout and Pb-free Matte Tin finish. Pin 6 is NC (no internal connection); ORG functionality is absent in 'B' variants.
| 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 | Rising-edge synchronized timing for all data transfers; clock can be paused mid-sequence without state loss. |
| DI (Pin 3) | Data Input | Receives start bit, opcode, address, and write data; high-impedance when not selected. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge. |
| VSS (Pin 5) | Ground | Reference for all digital and analog circuitry; must be low-impedance connection. |
| NC (Pin 6) | No Connection | Not bonded internally; must be left floating or tied to VSS per layout best practice. |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V only; internal POR triggers at 3.8 V; below threshold disables all operations including reads. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (2 ms), simplifying host firmware. |
| Automatic ERAL before WRAL | Ensures full array is erased prior to bulk write, preventing data corruption without explicit command sequencing. |
| Hardware write protection (EWEN/EWDS) | Prevents accidental overwrites during power transitions or noise events; device powers up in EWDS state. |
| Ready/Busy status on DO | Enables efficient polling without additional status lines - critical for resource-constrained microcontrollers. |
| RoHS-compliant & Pb-free | Meets global environmental regulations; Matte Tin finish ensures solderability and long-term shelf life. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing trim values, sensor calibration coefficients, and fault log history in engine management systems. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 8-bit/16-bit MCU via Microwire peripheral. Use Value: Automotive-grade temperature range and 1M endurance ensure reliable operation across 15+ year vehicle lifecycles. |
Use Scenario: Holding user-defined I/O mapping, PID tuning parameters, and firmware update flags in programmable logic controllers. IC Role / Device Role / Timing Role: Serial EEPROM providing secure, low-pin-count storage independent of main processor reset behavior. Use Value: Hardware write protection (EWEN/EWDS) prevents corruption during brown-out or hot-swap events. |
| Medical Infusion Pump Settings | Smart Meter Firmware Parameters |
Use Scenario: Retaining dosage limits, alarm thresholds, and operator audit trails in battery-powered medical devices. IC Role / Device Role / Timing Role: Low-power nonvolatile memory accessed during startup and maintenance mode. Use Value: 200-year data retention guarantees integrity of safety-critical settings without periodic refresh. |
Use Scenario: Storing tariff tables, communication keys, and metering calibration constants in utility smart meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage accessible over isolated RS-485 or PLC interfaces. Use Value: 4.5–5.5 V operation aligns with meter power supplies; WRAL enables atomic full-memory reprogramming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-E/ST | Wider VCC range (2.5–5.5 V); same 64×16 organization and SOIC-8 package. | Supports mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals); lacks 93C46B's 5 V-only robustness. | Select 93LC46B-E/ST if system operates below 4.5 V; otherwise 93C46B-E/ST offers tighter 5 V noise margin. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5 V, 5 ms write time, same E-temp grade. | Requires SPI master instead of Microwire; incompatible instruction set and timing; different pinout (SOIC-8). | Choose AT25010B-MAHL-T only when migrating to SPI architecture; not drop-in replaceable for 93C46B-E/ST. |
Compared with 93LC46B-E/ST and AT25010B-MAHL-T, the 93C46B-E/ST delivers optimal timing determinism and voltage-margin robustness for legacy 5 V Microwire designs, while avoiding SPI protocol overhead and ensuring direct compatibility with existing firmware drivers.
Availability
93C46B-E/ST is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC configuration storage, and medical device calibration applications requiring stable component supply across extended production lifecycles.
Supply support for 93C46B-E/ST 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, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93C46B-E/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, high-reliability embedded systems requiring simple 3-wire nonvolatile storage with deterministic timing and automotive-grade qualification.
FAQ
What is the memory organization of the 93C46B-E/ST?
The 93C46B-E/ST has a fixed 64 × 16-bit organization (1 Kbit total), with no ORG pin - unlike 'C' variants. This means it always operates in 16-bit word mode, accepting 6-bit addresses and transferring 16-bit data per READ/WRITE instruction. The absence of ORG simplifies PCB layout and eliminates external configuration logic.
Does the 93C46B-E/ST require an external pull-up resistor on the DO line?
No, the 93C46B-E/ST 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 deselected or idle. A pull-up may cause bus contention if DI and DO are shorted; Microchip recommends separate routing unless a series resistor is added per Section 2.2.
What is the minimum VCC required for the 93C46B-E/ST to function?
The 93C46B-E/ST requires VCC ≥ 4.5 V to operate correctly. Its internal power-on reset (POR) activates at ~3.8 V, disabling all operations - including reads - below that threshold. This ensures data integrity during brown-out conditions and distinguishes it from lower-voltage variants like the 93LC46B.
Can the 93C46B-E/ST be used in place of a 93C46A-E/ST?
No - the 93C46B-E/ST and 93C46A-E/ST are not interchangeable without firmware changes. The 93C46A-E/ST uses 128 × 8-bit organization (8-bit data transfers), while the 93C46B-E/ST uses 64 × 16-bit organization (16-bit transfers). Addressing, instruction timing, and data framing differ fundamentally between the two.
How is write protection implemented in the 93C46B-E/ST?
Write protection in the 93C46B-E/ST is enforced via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands. The device powers up in EWDS state, blocking all ERASE/WRITE/ERAL/WRAL instructions until EWEN is issued. After each write, issuing EWDS restores protection - a critical safeguard against spurious writes during power transients.
93C46B-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not 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-TSSOP
93C46B-E/ST FAQ
1.How can I place an order for 93C46B-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C46B-E/ST 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/ST reliable?
The price and inventory of 93C46B-E/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 93C46B-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C46B-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C46B-E/ST?
93C46B-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C46B-E/ST 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/ST?
For technical support, including 93C46B-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C46B-E/ST requirements.
6.How does Aetrix verify that 93C46B-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C46B-E/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 93C46B-E/ST?
All 93C46B-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C46B-E/ST, 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/ST part is unused and in its original packaging.
Return procedure for 93C46B-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C46B-E/ST 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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AT24CS02-SSHM-T
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93LC46BT-I/OT
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