Equivalent & Substitute Parts for 30WQ04FN Schottky Diode

Part Overview

The 30WQ04FN is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 3.5 A average rectified current in a surface mount TO-252AA (DPAK) package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified ratings within acceptable application parameters.

Key Parameters

Parameter	Specification
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	3.5 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 40 V
Mounting Type	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Operating Temperature - Junction	-40°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the 30WQ04FN is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 40 V
Current - Average Rectified (Io) rating must equal or exceed 3.5 A
Technology must be Schottky diode
Speed classification must be Fast Recovery (≤ 500ns, > 200mA)

Mechanical Compatibility Criteria:

Package / Case must be TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type must be Surface Mount

Compliance Criteria:

RoHS Status and REACH Status determine regulatory acceptability
Product Status (Active vs. Obsolete) indicates long-term availability

Parts are grouped into three categories: parametric equivalents (identical specifications), direct equivalents (same part number variants), and manufacturer-recommended substitutes (enhanced ratings with compatible packages).

Parameter Comparison

Parameter	30WQ04FN	VS-30WQ04FN-M3	STPS340B-TR	MBRD340T4G	DSS6-0045AS-TRL
Manufacturer	Vishay	Vishay	STMicroelectronics	onsemi	IXYS
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	45 V
Current - Average Rectified (Io)	3.5 A	3.5 A	3 A	3 A	6 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 3 A	530 mV @ 3 A	630 mV @ 3 A	600 mV @ 3 A	630 mV @ 6 A
Current - Reverse Leakage @ Vr	2 mA @ 40 V	2 mA @ 40 V	20 µA @ 40 V	200 µA @ 40 V	300 µA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Operating Temperature - Junction	-40°C ~ 150°C	-40°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 175°C
Product Status	Obsolete	Active	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent - Preferred Primary Substitute:

VS-30WQ04FN-M3 (Vishay) is the parametric equivalent to 30WQ04FN, maintaining identical electrical specifications (40 V, 3.5 A, 530 mV forward voltage) and operating temperature range (-40°C ~ 150°C). This part is classified as Active, ensuring long-term availability and supply chain continuity. The part achieves ROHS3 compliance, addressing regulatory requirements that the original obsolete part does not meet. Packaging is identical TO-252-3 DPAK. This substitution requires no circuit redesign.

Active Substitute - Current Rating Reduction:

MBRD340T4G (onsemi) and STPS340B-TR (STMicroelectronics) are active substitutes with reduced average rectified current ratings (3 A versus 3.5 A). Both maintain 40 V reverse voltage rating and TO-252-3 DPAK packaging. MBRD340T4G is classified as Active with ROHS3 compliance and extended operating temperature range (-65°C ~ 175°C). STPS340B-TR is classified as Obsolete. These substitutes are suitable for applications where the 3.5 A rating is not fully utilized.

Active Substitute - Enhanced Ratings:

DSS6-0045AS-TRL (IXYS) provides enhanced specifications with 45 V reverse voltage and 6 A average rectified current, maintaining TO-252-3 DPAK packaging and Fast Recovery speed classification. This part is Active with ROHS3 compliance and extended operating temperature range (-55°C ~ 175°C). This substitution is suitable for applications requiring higher current capacity or voltage margin.

Compliance Consideration:

All active substitutes achieve ROHS3 compliance, whereas the original 30WQ04FN is RoHS non-compliant. For new designs or products subject to RoHS regulations, active substitutes are mandatory.

Frequently Asked Questions (FAQ)

Q: Can VS-30WQ04FN-M3 be used as a direct replacement for 30WQ04FN?

A: Yes. VS-30WQ04FN-M3 is a parametric equivalent with identical voltage (40 V), current (3.5 A), forward voltage (530 mV @ 3 A), and operating temperature range (-40°C ~ 150°C). The part uses the same TO-252-3 DPAK package. No circuit modifications are required. The primary advantage is Active product status and ROHS3 compliance.

Q: What is the difference between MBRD340T4G and the original 30WQ04FN?

A: MBRD340T4G has a reduced average rectified current rating of 3 A compared to 3.5 A in the 30WQ04FN. Reverse voltage (40 V), package (TO-252-3 DPAK), and speed classification (Fast Recovery) are identical. Forward voltage is slightly higher at 600 mV @ 3 A versus 530 mV @ 3 A. MBRD340T4G is Active with ROHS3 compliance and extended temperature range (-65°C ~ 175°C).

Q: Is DSS6-0045AS-TRL compatible with the 30WQ04FN application?

A: DSS6-0045AS-TRL is mechanically compatible (TO-252-3 DPAK package) and electrically compatible for applications not requiring the full 3.5 A rating. The part provides higher current capacity (6 A) and voltage rating (45 V), making it suitable for designs with margin requirements. Forward voltage is 630 mV @ 6 A. Verify application current requirements before substitution.

Q: Why is RoHS compliance important for substitution?

A: RoHS compliance status determines regulatory acceptability in specific markets and applications. The original 30WQ04FN is RoHS non-compliant. All active substitutes (VS-30WQ04FN-M3, MBRD340T4G, DSS6-0045AS-TRL) are ROHS3 compliant, meeting current environmental and safety regulations. For new designs or products sold in regulated markets, RoHS-compliant substitutes are required.

Q: Can I use STPS340B-TR as a substitute?

A: STPS340B-TR is mechanically and electrically compatible with identical 40 V rating and TO-252-3 DPAK package. However, it is classified as Obsolete, which limits long-term availability. The current rating is reduced to 3 A. For new designs, MBRD340T4G or VS-30WQ04FN-M3 are preferred due to Active status.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Voltage - DC Reverse rating equal to or exceeding 40 V, (2) Current - Average Rectified rating equal to or exceeding 3.5 A (or verified as acceptable for reduced ratings), (3) Technology classification as Schottky diode, (4) Speed classification as Fast Recovery, (5) Package / Case as TO-252-3 DPAK, and (6) Mounting Type as Surface Mount. All substitute parts listed meet these criteria.

Q: What is the difference between parametric equivalents and manufacturer-recommended substitutes?

A: Parametric equivalents (VS-30WQ04FN-M3) maintain identical electrical and mechanical specifications with no design changes required. Manufacturer-recommended substitutes (MBRD340T4G, STPS340B-TR, DSS6-0045AS-TRL) provide functional alternatives with modified ratings. Substitutes may have different current or voltage ratings, forward voltage characteristics, or temperature ranges. Application verification is required for substitutes with modified ratings.

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