VS-81CNQ045ASLPBF Equivalent & Substitute Parts

Part Overview

The VS-81CNQ045ASLPBF is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45V DC reverse voltage and 40A average rectified current per diode. The device is designed for surface mount applications in the D-61-8-SL package.

This part is classified as Obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array.

Substiute Parts

VS-81CNQ045ASLPBF

Vishay General Semiconductor - Diodes DivisionIn Stock: 843VS-81CNQ045ASLPBF Datasheet

Current PartRFQ

84CNQ045SL

SMC Diode SolutionsIn Stock: 116584CNQ045SL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VS-81CNQ045ASLPBF is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Diode Configuration: 1 Pair Common Cathode (functional topology must match)
• Technology: Schottky (device type must remain consistent)
• Voltage - DC Reverse (Vr) (Max): 45 V (minimum rating requirement)
• Current - Average Rectified (Io) (per Diode): 40 A (current handling capacity)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (switching performance)

Mechanical & Environmental Compatibility:

• Mounting Type: Surface Mount (PCB assembly compatibility)
• RoHS Status: ROHS3 Compliant (regulatory requirement)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (handling and storage compatibility)

Substitute parts must satisfy all electrical parameters at or above the specified ratings and maintain identical mounting and environmental compliance classifications.

Parameter Comparison

Engineering Selection Recommendations

84CNQ045SL as Substitute for VS-81CNQ045ASLPBF:

The 84CNQ045SL from SMC Diode Solutions satisfies the core electrical requirements for substitution. Both components share identical Schottky diode array configuration, 45V reverse voltage rating, 40A current capacity, and fast recovery switching characteristics. Both maintain ROHS3 compliance and MSL Level 1 moisture sensitivity ratings.

The substitute part is currently in active production status, providing supply chain continuity for the obsolete VS-81CNQ045ASLPBF.

Critical Considerations:

1. Operating Temperature Range: The substitute part operates to a maximum junction temperature of 125°C, compared to 175°C for the main part. Applications requiring sustained operation above 125°C require thermal analysis to confirm compatibility.

2. Forward Voltage: The substitute is rated at 620 mV maximum forward voltage at 40A, compared to 600 mV for the main part. This 20 mV difference affects power dissipation calculations and thermal management in high-current applications.

3. Package Transition: The substitute uses PRM2-SL package versus the D-61-8-SL package of the main part. PCB layout and footprint modifications are required for physical integration.

4. Regulatory Status: The substitute is REACH Affected, whereas the main part is REACH Unaffected. Supply chain documentation and compliance verification are necessary for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the 84CNQ045SL directly replace the VS-81CNQ045ASLPBF without PCB modifications?

A: No. The parts use different surface mount packages (PRM2-SL versus D-61-8-SL). PCB footprint redesign and layout modifications are required. Mechanical compatibility cannot be assumed.

Q: What is the impact of the 20 mV forward voltage difference?

A: At 40A operation, the 84CNQ045SL dissipates an additional 0.8W compared to the VS-81CNQ045ASLPBF (20 mV × 40A = 0.8W). Thermal design calculations must account for this increased power dissipation.

Q: Is the 84CNQ045SL suitable for applications operating above 125°C?

A: The 84CNQ045SL is rated to 125°C maximum junction temperature. Applications requiring sustained operation above 125°C must verify thermal performance through detailed analysis. The original VS-81CNQ045ASLPBF supports operation to 175°C.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant. The 84CNQ045SL is REACH Affected, while the VS-81CNQ045ASLPBF is REACH Unaffected. Applications subject to REACH regulations require verification of the substitute part's compliance documentation.

Q: What is the reverse leakage current difference?

A: The main part specifies 5 mA leakage at 40V. The substitute specifies 5 mA leakage at 45V. At the substitute's rated voltage, leakage performance is equivalent.

Q: Why is the main part obsolete?

A: The VS-81CNQ045ASLPBF is classified as obsolete by Vishay. The 84CNQ045SL from SMC Diode Solutions is an active production alternative with equivalent electrical specifications.