30WQ03FN Schottky Diode Equivalent & Substitute Parts

Part Overview

The 30WQ03FN is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 30 V DC reverse voltage and 3.5 A average rectified current in a surface mount TO-252AA (DPAK) package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the Schottky diode category.

Substiute Parts

30WQ03FN

Vishay General Semiconductor - Diodes DivisionIn Stock: 147030WQ03FN Datasheet

Current PartRFQ

VS-30WQ03FN-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 3275VS-30WQ03FN-M3 Datasheet

Parametric EquivalentRFQ

30WQ03FN

SMC Diode SolutionsIn Stock: 148930WQ03FN Datasheet

DirectRFQ

MBRD330RLG

onsemiIn Stock: 10245MBRD330RLG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 30WQ03FN Schottky diode is determined by the following critical parameters:

Electrical Specifications:

• Voltage - DC Reverse (Vr) (Max): 30 V minimum
• Current - Average Rectified (Io): 3.5 A or greater
• Voltage - Forward (Vf) (Max) @ If: 450 mV or lower at 3 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 2 mA or lower @ 30 V

Mechanical Specifications:

• Mounting Type: Surface Mount
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
• Operating Temperature - Junction: -40°C to 150°C minimum range

Compliance Requirements:

• RoHS Status: ROHS3 Compliant preferred for new designs
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts are grouped into three categories: parametric equivalents (identical specifications, different product status), direct manufacturer alternatives (same part number from different manufacturers), and manufacturer-recommended substitutes (functionally compatible with minor parameter variations).

Parameter Comparison

Engineering Selection Recommendations

Primary Equivalent (Recommended for New Designs):

VS-30WQ03FN-M3 from Vishay General Semiconductor is the primary equivalent for the obsolete 30WQ03FN. This part maintains identical electrical specifications (30 V, 3.5 A, 450 mV forward voltage, 2 mA reverse leakage) and mechanical compatibility (TO-252-3 DPAK package). The critical advantage is active product status with ROHS3 compliance, making it suitable for current production and future procurement. Higher inventory availability (3217 units) supports supply chain continuity.

Alternative Equivalent (Active Status):

30WQ03FN from SMC Diode Solutions provides an alternative source with identical part number designation and active product status. This part matches the primary electrical specifications and package requirements. ROHS3 compliance and Tape & Reel packaging support automated assembly processes. Selection between Vishay and SMC variants depends on supplier availability and procurement agreements.

Functional Substitute (Lower Current Rating):

MBRD330RLG from onsemi (SWITCHMODE™ series) functions as a substitute where current requirements do not exceed 3 A. This part maintains 30 V reverse voltage rating, fast recovery speed, and TO-252-3 DPAK package compatibility. Forward voltage is higher (600 mV @ 3 A versus 450 mV), and reverse leakage is lower (200 µA versus 2 mA). Extended operating temperature range (-65 to 150°C) provides additional thermal margin. Product status is Last Time Buy, limiting long-term availability. Use only when 3.5 A current capacity is not required and higher forward voltage is acceptable.

Compliance Considerations:

The original 30WQ03FN is RoHS non-compliant. All recommended equivalents and substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and production. Moisture Sensitivity Level (MSL) 1 (Unlimited) is consistent across all parts, eliminating moisture handling concerns.

Frequently Asked Questions (FAQ)

Q: Can VS-30WQ03FN-M3 directly replace the obsolete 30WQ03FN in existing designs?

A: Yes. VS-30WQ03FN-M3 is a parametric equivalent with identical electrical specifications (30 V, 3.5 A, 450 mV forward voltage, 2 mA reverse leakage) and mechanical compatibility (TO-252-3 DPAK package). The part is pin-compatible and functionally interchangeable. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between the Vishay and SMC versions of 30WQ03FN?

A: Both parts share the same part number designation and electrical specifications. The primary differences are manufacturer source (Vishay versus SMC Diode Solutions), packaging format (Tube versus Tape & Reel), and inventory availability. Both are ROHS3 compliant and active products. Selection depends on supplier preference and assembly process requirements.

Q: Can MBRD330RLG replace 30WQ03FN in all applications?

A: MBRD330RLG is a functional substitute only for applications where current does not exceed 3 A. The part maintains 30 V reverse voltage and fast recovery speed but has higher forward voltage (600 mV versus 450 mV) and lower reverse leakage (200 µA versus 2 mA). Applications requiring the full 3.5 A rating must use VS-30WQ03FN-M3 or the SMC equivalent.

Q: Are all substitute parts compatible with the TO-252-3 DPAK package footprint?

A: Yes. All listed equivalents and substitutes use the TO-252-3 DPAK (2 Leads + Tab), SC-63 package. PCB footprints and thermal management designs are directly compatible without modification.

Q: What is the significance of the "Last Time Buy" status for MBRD330RLG?

A: Last Time Buy status indicates that onsemi has announced end-of-life for this product. Existing inventory is available for purchase, but no future production is planned. This part should be used only for applications where current requirements do not exceed 3 A and where long-term supply is not critical. For new designs requiring sustained production, use VS-30WQ03FN-M3 or the SMC equivalent.

Q: Are there temperature range differences between the parts?

A: Yes. The original 30WQ03FN, VS-30WQ03FN-M3, and the SMC equivalent operate from -40 to 150°C. MBRD330RLG extends the lower limit to -65°C, providing additional thermal margin in cold environments. All parts support the standard -40 to 150°C range.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage directly affects power dissipation and voltage drop across the diode. The original 30WQ03FN and its equivalents (VS-30WQ03FN-M3 and SMC 30WQ03FN) specify 450 mV @ 3 A. MBRD330RLG specifies 600 mV @ 3 A, resulting in 150 mV additional voltage drop. In low-voltage applications or high-current scenarios, this difference may require circuit redesign. Verify that the higher forward voltage is acceptable for the intended application.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current determines standby power consumption and circuit performance in reverse-biased conditions. The original 30WQ03FN and equivalents specify 2 mA @ 30 V. MBRD330RLG specifies 200 µA @ 30 V, which is significantly lower. For applications sensitive to leakage current, MBRD330RLG provides superior performance. For general rectification applications, both specifications are acceptable.

Q: What packaging formats are available for these parts?

A: VS-30WQ03FN-M3 is supplied in Tube packaging. The SMC 30WQ03FN is supplied in Tape & Reel (TR) format. MBRD330RLG is supplied in Cut Tape (CT) & Digi-Reel® format. Tube packaging is suitable for manual assembly and small-volume production. Tape & Reel and Digi-Reel formats support automated pick-and-place assembly. Select packaging based on production volume and assembly process requirements.