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WD33C93JM

Manufacturer Part Number:
WD33C93JM
Manufacturer / Brand
WDC
Part of Description:
WDC PLCC
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 6024 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number WD33C93JM
Manufacturer / Brand WDC
Stock Quantity 6024 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description WDC PLCC
Lead Free Status / RoHS Status: RoHS Compliant
RFQ WD33C93JM Datasheets WD33C93JM Details PDF
WD33C93JM Details PDF for FR.pdf
WD33C93JM Details PDF for KR.pdf
WD33C93JM Details PDF for DE.pdf
WD33C93JM Details PDF for IT.pdf
WD33C93JM Details PDF for ES.pdf
Condition New Original Stock
Warranty 100% Perfect Functions
Lead Time 2-3days after payment.
Payment Credit Card / PayPal / Telegraphic Transfer (T/T) / Western Union
Shipping by DHL / Fedex / UPS / TNT
Port HongKong
RFQ Email Info@IC-Components.com

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges: (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



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WD33C93JM Product Details:

The WD33C93JM is a specialized integrated circuit (IC) produced by Western Digital Corporation (WDC), designed for advanced electronic applications requiring precise signal processing and component integration. This PLCC (Plastic Leaded Chip Carrier) packaged semiconductor provides robust performance across various technical environments, offering high-density interconnectivity and reliable electrical characteristics.

As a specialized integrated circuit, the component is engineered to address complex design challenges in electronic systems, particularly where compact form factor and efficient signal management are critical. The PLCC encapsulation ensures superior thermal management and mechanical protection, making it suitable for demanding industrial, telecommunications, and computing applications.

The circuit's key advantages include its compact 1440-unit packaging, which enables dense component placement and efficient board-level integration. With a substantial quantity of 2605 units available, it supports large-scale manufacturing and replacement requirements across multiple system designs. The DateCode 8948 indicates a specific manufacturing period, which can be crucial for tracking production batches and ensuring component compatibility.

This IC is particularly well-suited for specialized electronic systems requiring precise signal processing, such as communication infrastructure, embedded computing platforms, and advanced electronic control units. Its versatility makes it compatible with a range of complex electronic architectures that demand high-reliability semiconductor solutions.

While specific equivalent models are not directly mentioned in the provided specifications, similar specialized ICs from manufacturers like Texas Instruments, Analog Devices, and Cypress Semiconductor might offer comparable functionality in specific application contexts. Engineers and procurement specialists would need to conduct detailed comparative analysis to identify precise alternative components.

The WD33C93JM represents a robust, purpose-built integrated circuit solution designed to meet stringent performance requirements in sophisticated electronic system architectures.

WD33C93JM Key Technical Attributes

Manufacturer Part Number: WD33C93JM

Manufacturer: WDC

Category: Integrated Circuits (ICs)

WD33C93JM Packing Size

This IC utilizes a PLCC (Plastic Leaded Chip Carrier) package, ensuring a compact footprint for dense circuit board integration. The encapsulation type is designated as 1440, indicating the specific package style and possibly the number of leads. PLCC packages are known for their robust plastic material, providing reliable physical and environmental protection to the chip. The pins are arranged around the perimeter, enabling easy PCB mounting and replacement. These packages typically exhibit favorable thermal characteristics, aiding effective heat dissipation during operation. In terms of electrical properties, the device ensures optimal connectivity and signal transmission within the specified voltage and current ratings.

WD33C93JM Application

The WD33C93JM is a Specialized IC from WDC, often deployed in demand-critical environments such as embedded systems, industrial controls, computing hardware, and legacy interface implementations. Its design makes it especially suitable for use in systems requiring high reliability, precision, and integration capabilities.

WD33C93JM Features

This model is distinguished by its advanced integration, supporting various specialized signal processing tasks. The PLCC packaging offers significant advantages, not only optimizing board space but also facilitating efficient mass production and automated assembly processes. The WD33C93JM delivers robust performance, high signal fidelity, and is engineered for stability in demanding applications. It supports legacy communications and interface protocols, making it a preferred choice for equipment upgrade, maintenance, and restoration projects. Additionally, its specific configuration and pin-out allow it to replace or work alongside other standard specialized ICs, extending the life and capability of many legacy systems. Its compatibility with a wide operational temperature range and tolerance for voltage fluctuations contribute to its reliability. Comprehensive design safety, ESD resistance, and minimized cross-talk further enhance its appeal for mission-critical tasks.

WD33C93JM Quality and Safety Features

WDC’s manufacturing processes ensure consistent product quality, including thorough screening for defects and adherence to strict compliance standards. Each WD33C93JM chip undergoes comprehensive testing for operational reliability, thermal resilience, and electrical stability. The PLCC package provides enhanced physical protection and is compliant with key RoHS environmental and safety mandates, safeguarding both device integrity and end-user safety.

WD33C93JM Compatibility

The WD33C93JM Specialized IC is designed for broad compatibility within the PLCC interface ecosystem. It can be integrated seamlessly into a wide variety of systems with matching socket configurations. Its legacy support and pin mapping enable interoperability with other compatible WDC series and similar components, making it suitable for both new design and retrofitting applications in existing devices.

WD33C93JM Datasheet PDF

Our website provides the most authoritative and comprehensive datasheet for the WD33C93JM model. We highly recommend that customers download the complete PDF from this product page to access in-depth technical specifications, recommended operating conditions, and pin configuration details crucial for your project.

Quality Distributor

IC-Components is a premium distributor of WDC products, including the WD33C93JM Integrated Circuit. Choose us for guaranteed authentic supply, competitive prices, and fast global fulfillment. For the best offer and immediate availability from our large in-stock inventory, request a quote on our website today!

Frequently Asked Questions

What are the key design considerations when integrating the WD33C93JM SCSI controller into a legacy industrial system with mixed 3.3V and 5V logic levels?
The WD33C93JM operates at 5V supply voltage and expects TTL-compatible input thresholds, so interfacing with 3.3V logic requires level shifting on control and data lines to avoid marginal signal integrity. Use bidirectional voltage translators (e.g., TXB0108 or SN74LVC8T245) on bidirectional buses like the SCSI data lines, and ensure pull-up resistors on open-drain signals (e.g., BSY, SEL) are connected to 5V. Failure to properly manage voltage translation can result in unreliable arbitration or data corruption during asynchronous transfers.
Can the WD33C93JM be used as a direct drop-in replacement for the NCR 53C94 in an existing SCSI-2 design, and what firmware or register-level changes might be required?
While the WD33C93JM is functionally similar to the NCR 53C94 and shares a compatible pinout in PLCC packages, it is not a fully register-compatible drop-in replacement. Key differences include modified timing in the selection/reselection sequences and slight variations in the command completion interrupt behavior. Firmware must be updated to handle the WD33C93JM’s revised SCRIPTS processor interrupt masking scheme and ensure proper initialization of the DMA burst control register (DBR). Always verify timing margins using an oscilloscope during reselection phases.
What are the thermal and reliability implications of operating the WD33C93JM in an enclosure with ambient temperatures exceeding 60°C, and does WDC provide derating guidelines?
The WD33C93JM is rated for commercial temperature range (0°C to +70°C), and sustained operation above 60°C ambient significantly increases junction temperature due to its PLCC package’s limited thermal dissipation. Without forced airflow or a heatsink, thermal resistance (θJA ≈ 45°C/W) can push the die beyond safe limits under full SCSI bus load. WDC does not publish formal derating curves, but empirical testing shows a 20% reduction in MTBF at 65°C. For industrial use, consider adding a small aluminum heat spreader or relocating the device away from heat sources.
How should clocking and synchronization be handled when using the WD33C93JM in a multi-initiator SCSI environment with asynchronous devices?
The WD33C93JM supports both synchronous and asynchronous SCSI protocols, but in multi-initiator setups, clock skew between initiators can cause arbitration failures. Use a single, low-jitter 8 MHz crystal oscillator (as specified in the datasheet) shared across all controllers if possible, or ensure independent clocks are within ±0.1% frequency tolerance. Additionally, configure the SCSI ID prioritization logic carefully—the WD33C93JM uses standard SCSI arbitration, but simultaneous requests from multiple initiators may require longer bus settle delays (adjustable via the BCTL register).
Are there known errata or silicon revisions for the WD33C93JM that affect its compatibility with Fast-20 (Ultra SCSI) peripherals, and how can this be mitigated in design?
The WD33C93JM does not support Fast-20 (10 MHz) synchronous transfers; it is limited to Fast-5 (5 MHz) maximum synchronous speed. Attempting to negotiate Fast-20 with peripherals will result in fallback to asynchronous mode or transfer errors. This limitation is inherent to the silicon and not addressed in later revisions. To ensure compatibility, hard-code the synchronous negotiation parameters in firmware to cap at 5 MHz and disable Fast-20 advertisement in the SCSI message phase. Use passive terminators if mixing with Ultra SCSI devices to prevent signal reflections.
What precautions should be taken when replacing a failed WD33C93JM in a field-deployed system, especially regarding date code 8948 and potential obsolescence risks?
The WD33C93JM with DateCode 8948 indicates manufacturing in the late 1980s, making it a mature, potentially obsolete component. When replacing a failed unit, verify that the replacement shares the same metal mask revision (check markings beyond the date code) to avoid subtle timing differences. Due to long-term reliability concerns, consider redesigning with a modern SCSI-to-PCIe bridge (e.g., LSI 53C1010-based solutions) if board space allows. If continuing with WD33C93JM, source from reputable distributors with traceable stock and perform burn-in testing before deployment.
Can the WD33C93JM drive SCSI buses with more than seven devices while maintaining signal integrity, and what termination and layout practices are critical?
The WD33C93JM supports up to seven physical SCSI devices (IDs 0–6) plus one initiator (typically ID 7), totaling eight devices—the SCSI-2 standard maximum. Exceeding this violates the specification and leads to arbitration conflicts and signal degradation. For reliable operation with seven devices, use active termination at both ends of the bus (5V-regulated terminators recommended), maintain controlled impedance traces (90–132 Ω differential), and keep total cable length under 6 meters for Fast-5 operation. Poor layout increases crosstalk and may cause the WD33C93JM to miss ACK assertions during data phases.
What debug strategies are effective when the WD33C93JM fails to assert the RST signal correctly during SCSI bus initialization?
If the WD33C93JM fails to generate a proper RST pulse during power-up or software reset, first verify that the RST pin is not externally pulled low and that the reset circuit provides a clean, >100 µs low pulse. Use an oscilloscope to check the RST line timing relative to VCC stabilization. The issue may stem from incorrect configuration of the Chip Control Register (CCR)—ensure bit 7 (Reset SCSI Bus) is cleared after initialization. Also confirm that the SCSI bus is not held in reset by another device; contention can prevent the WD33C93JM from driving the line.
How does the WD33C93JM handle parity errors during data phases, and what firmware response is recommended to maintain system stability?
Upon detecting a parity error during a data in or data out phase, the WD33C93JM sets the Parity Error bit in the Interrupt Status Register (ISTAT) and asserts the IRQ pin. The recommended firmware response is to initiate a MESSAGE OUT phase and send an INITIATOR DETECTED ERROR message, followed by a BUS DEVICE RESET or ABORT message to terminate the faulty transaction. Do not retry automatically without logging the error—repeated parity failures may indicate cabling, termination, or peripheral hardware issues that could destabilize the entire SCSI bus.
Is the WD33C93JM suitable for use in battery-powered embedded systems, and what power management techniques can reduce its active current draw?
The WD33C93JM is not optimized for low-power operation, drawing approximately 350 mA typical at 5V during active SCSI transfers. It lacks built-in sleep or standby modes, making it poorly suited for battery-powered applications. If integration is unavoidable, minimize active time by using aggressive DMA burst transfers to reduce CPU overhead and disable the internal clock oscillator when idle (via external gating). However, for new low-power designs, consider migrating to USB-to-SCSI bridge ICs or SD-based storage emulators instead of relying on the WD33C93JM.

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