Name: /Tools-Info/Vs-P405w
Brand: EstiSource
Availability: InStock

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Vishay VS-P405W (SCR Bridge Module, 1.2 kV / 40 A)

is an integrated power semiconductor module from Vishay’s VS-P400 series, containing two SCRs and two diodes in a single bridge package. It is a chassis-mount, through-hole module rated for 1200 V repetitive off-state voltage (V_DRM) and 40 A load current. The internal SCRs and diodes have glass-passivated silicon junctions for high reliability, and they are mounted on an electrically isolated metal base plate to simplify heat-sink attachment and ensure safety. Typical applications include AC-DC power supplies, battery chargers, motor controls, and other circuits requiring controlled rectification.

How EstiSource Helps

EstiSource offers specialized sourcing tools and expertise for components like the VS-P405W. Its RFQ management platform (“Smart Source”) enables procurement teams to send requests and compare quotes from multiple authorized suppliers, ensuring competitive pricing and reliability. EstiSource also provides detailed cost analysis tools – its Cost Estimator can break down this module’s cost drivers (materials, labor, overhead) and suggest design-for-cost or alternative strategies. If the VS-P405W is on long lead-time or short stock, EstiSource’s supplier network can help identify compatible parts or legacy stocks. In summary, EstiSource streamlines sourcing by managing quotations and evaluating part alternatives against your target cost.

Why Choose EstiSource for Sourcing VS-P405W

Comprehensive Supplier Network: EstiSource has connections with global distributors and manufacturers, helping you find legitimate sources of the VS-P405W quickly. Expert Cost Analysis: With a background in product cost engineering, EstiSource helps you understand and validate the pricing of complex modules like this. Quality Assurance: Their platform emphasizes sourcing from authorized vendors, reducing the risk of counterfeit components in critical power electronics. End-to-End Support: From initial quote to delivery, EstiSource’s tools and experts guide procurement. They focus on “precision in every estimate, excellence in service”. Industry Knowledge: EstiSource teams understand power semiconductors and can recommend design or supplier alternatives if needed. By partnering with EstiSource, sourcing managers and engineers gain visibility into pricing and availability of the VS-P405W, assurance of quality, and analytics to make cost-effective decisions – all critical when dealing with specialized power modules.

1. Material Composition

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2. Manufacturing Process

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Wafer Fabrication: Grow and slice silicon ingots to create wafers. Using photolithography, define and form the layered PNPN structures of the thyristors and diodes through diffusion or ion implantation, followed by oxidation/passivation.

Chip Testing: Dice the processed wafers and test individual SCR and diode dies for electrical parameters (breakover voltage, leakage, etc.) to ensure only parts meeting specifications are used.

Substrate Preparation: Prepare a ceramic substrate with printed metallization patterns for the circuit (using Au/Ag/Cu metallization) and bond it to the metal base plate. This baseplate may have a dielectric layer for isolation.

Die Attach: Place the SCR and diode chips onto the metallized substrate in the required bridge configuration. Attach them using a solder or sinter paste. The chips are thermally bonded to the base via the substrate.

Wire Bonding: Connect the chips to the module’s terminals by thermosonically or ultrasonic wire bonding (typically aluminum or copper wire). Additional interconnects (jumper bars or thick film) may be used for power paths.

Encapsulation: Apply protective epoxy or silicone around the bonded chips and wires, then mold or pot the assembly to insulate and protect it from moisture and mechanical stress.

Assembly: Insert metal terminals/leads through the package, trim excess material, and attach any insulating hardware (e.g. silicone boots or insulation washers) for the baseplate. Screw down and seal the assembly as per PACE-PAK requirements.

Final Testing: Perform electrical tests on the completed module, including DC on-state voltage drop, off-state leakage, non-repetitive surge capability, and parametric checks (gate trigger current/voltage). Modules are also burn-in tested for reliability.

Quality Inspection: Inspect for correct assembly (wire bonds, package integrity) and certify the module meets Vishay’s quality standards.

This hybrid microelectronics process yields a compact high-power module. The power chips and substrate form the “power section,” all mounted on a metal baseplate for efficient heat sinking.

3. Challenges & Limitations

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Thermal Management

At 40 A continuous current, the VS-P405W generates significant heat. Effective heat sinking and thermal interface materials are required to keep junction temperature below 125 °C. The isolating baseplate adds thermal resistance, so proper mounting (flat surface, correct torque) is critical.

Switching Speed

SCRs switch relatively slowly. This module is suitable for low-frequency (50/60 Hz) or phase-angle control applications, but not for high-speed PWM. Designers must include snubbers or filters to manage di/dt and dv/dt limits.

Voltage Drop and Losses

On-state voltage drop (~1.4 V per SCR at rated current) causes power dissipation. Off-state leakage can be ~10 mA at full V_DRM (spec depends on junction temperature). These losses must be accommodated in thermal design.

Packaging Constraints

The 8-PACE-PAK chassis-mount format is legacy packaging. It requires through-hole mounting hardware, and pins must fit the board or sink layout. Limited creepage distance on the module may demand additional clearance or insulating kits in some designs.

Long Lead Times

As a specialized power module (originally from Vishay/IR), stock may be limited. For example, authorized lead time is listed as ~12 weeks. Procurement should plan ahead or qualify alternates.

Component Obsolescence Risk

The VS-P400 series is an older design. There is some sourcing risk if Vishay discontinues or changes it. Availability from authorized distributors should be verified, and counterfeit or gray-market sources should be avoided.

Cost

At low volumes, the unit cost is relatively high (see Costing below). Budgets must consider this, especially for prototypes.

Mechanical Limits

Being a heavy power module, vibration or shock can stress solder joints. Ensure rugged mounting.

4. Costing

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5. Properties & Characteristics

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6. Frequently Asked Questions

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Q: What is the VS-P405W used for?

It serves as a single-phase AC-DC power conversion module. In practice, it’s used in industrial power supplies, battery chargers, motor controllers, and other systems needing controlled rectification.

Q: How should the module be mounted?

It is a chassis-mount module. Secure it to a heatsink or chassis with screws through its insulating pads. Tighten to the specified torque to ensure good thermal contact. Use insulating hardware if the baseplate must be isolated electrically.

Q: What cooling does it require?

A sizable heatsink is required. The isolating base adds thermal resistance, so a high-quality thermal interface (grease or pad) and a well-designed heatsink are essential to keep junctions ≤125 °C.

Q: What gate drive does it need?

Each SCR requires a pulse of ~2 V and up to 60 mA at the gate to trigger. A standard SCR gate driver or controller is used. Ensure commutation and gate circuitry are designed for a thyristor.

Q: Are there equivalents or replacements?

Direct equivalents are rare – one would typically source genuine Vishay (formerly IR) VS-P405W. Similar modules might exist from other manufacturers, but differences in pinout and ratings mean substitutes require careful checking. (For example, lower-voltage VS-P402W or higher-current variants in the P400 series.)

Q: Is the part RoHS compliant?

Yes. The VS-P405W is lead-free and RoHS-compliant. It often carries a Vishay or IR logo indicating lead-free status.

Q: How long is the lead time?

Vishay lists a standard lead time of about 12 weeks. Stock is limited, so plan orders accordingly or use sourcing services to find available inventory.

These FAQs cover common points about using the VS-P405W SCR bridge module. Overall, it’s a robust device – understanding its triggering and commutation behavior is key to applying it successfully. It remains a straightforward and friendly chip for adding RTC functionality. As long as you use a proper crystal, battery and follow the datasheet guidelines, it will do its job of timestamping your project’s data or keeping track of time for you.