6CWQ04FN Equivalent & Substitute Parts

Part Overview

The 6CWQ04FN is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 40 V DC reverse voltage and 3.5 A average rectified current per diode. The device is packaged in TO-252-3 (DPAK) surface mount format with fast recovery characteristics suitable for high-frequency switching applications.

The 6CWQ04FN is classified as obsolete. Equivalent and substitute parts are necessary to support ongoing production requirements, design updates, and supply chain continuity. Active alternatives with identical or enhanced electrical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io) (per Diode)	3.5	A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 3 A	—
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Current - Reverse Leakage @ Vr	2	mA @ 40 V
Operating Temperature - Junction	−40 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 6CWQ04FN is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode Configuration: 1 Pair Common Cathode (pin-compatible topology)
Voltage - DC Reverse (Vr) (Max): Minimum 40 V (equal or higher rating acceptable)
Current - Average Rectified (Io) (per Diode): Minimum 3.5 A (equal or higher rating acceptable)
Technology: Schottky (fast recovery switching characteristics)
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Mechanical Compatibility Requirements:

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

Compliance Considerations:

RoHS Status: Substitutes with ROHS3 Compliant status are preferred for new designs
Moisture Sensitivity Level (MSL): 1 (Unlimited) maintained across all alternatives
REACH Status: REACH Unaffected maintained across all alternatives

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (enhanced current ratings or voltage ratings with identical package and configuration).

Parameter Comparison

Parameter	6CWQ04FN	VS-6CWQ04FN-M3	VS-6CWQ04FNHM3	RB085BM-40FHTL	RB085BM-40TL	SBR1045CTLQ-13	STPS1045B	STPS1045B-TR	STPS15L45CB
Manufacturer	Vishay	Vishay	Vishay	Rohm	Rohm	Diodes Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Active	Active	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	Single Diode	1 Pair Common Cathode	Single Diode	Single Diode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Super Barrier	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	3.5 A	3.5 A	3.5 A	10 A	10 A	10 A	10 A	10 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 3 A	530 mV @ 3 A	530 mV @ 3 A	550 mV @ 5 A	550 mV @ 5 A	550 mV @ 5 A	630 mV @ 10 A	630 mV @ 10 A	520 mV @ 7.5 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 40 V	2 mA @ 40 V	2 mA @ 40 V	200 µA @ 40 V	200 µA @ 40 V	300 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V	1 mA @ 45 V
Operating Temperature - Junction	−40 to 150 °C	150 °C (Max)	−40 to 150 °C	150 °C (Max)	150 °C (Max)	−65 to 150 °C	175 °C (Max)	175 °C (Max)	150 °C (Max)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Qualified	No	No	Yes	Yes	No	No	No	No	No

Engineering Selection Recommendations

Parametric Equivalents (Identical Electrical Specifications):

VS-6CWQ04FN-M3 and VS-6CWQ04FNHM3 are direct parametric equivalents to the 6CWQ04FN, maintaining identical diode configuration, voltage rating, current rating, and forward voltage characteristics. Both are manufactured by Vishay and packaged in TO-252-3 DPAK format. VS-6CWQ04FN-M3 is classified as Active with ROHS3 compliance. VS-6CWQ04FNHM3 is classified as Active with ROHS3 compliance and carries AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications.

Manufacturer-Recommended Alternatives (Enhanced Current Ratings):

RB085BM-40FHTL (Rohm Semiconductor) provides a 40 V / 10 A rated alternative with identical package and diode pair common cathode configuration. This part is Active, ROHS3 compliant, and AEC-Q101 qualified. The higher current rating (10 A versus 3.5 A) provides design margin for applications requiring increased current capacity within the same voltage class.

SBR1045CTLQ-13 (Diodes Incorporated) offers a 45 V / 10 A Super Barrier diode array with 1 Pair Common Cathode configuration in TO-252-3 DPAK. This part is Active and ROHS3 compliant. The elevated voltage rating (45 V versus 40 V) and higher current capacity (10 A) accommodate applications with higher voltage transients or increased current demands.

STPS15L45CB (STMicroelectronics) provides a 45 V / 7.5 A Schottky diode array with 1 Pair Common Cathode configuration in TO-252-3 DPAK. This part is Active and ROHS3 compliant. The 7.5 A current rating offers intermediate capacity between the original 3.5 A and the 10 A alternatives, with forward voltage of 520 mV @ 7.5 A closely matching the original specification.

Not Recommended for New Designs:

RB085BM-40TL is classified as Not For New Designs and should not be selected for new product development despite meeting electrical and package requirements.

STPS1045B and STPS1045B-TR are single-diode devices rather than diode pairs with common cathode configuration. These parts are not pin-compatible with the 6CWQ04FN and require circuit redesign.

Compliance Considerations:

For applications requiring RoHS compliance, all substitute parts listed as Active are ROHS3 compliant. For automotive applications requiring AEC-Q101 qualification, VS-6CWQ04FNHM3 and RB085BM-40FHTL are qualified options.

Frequently Asked Questions (FAQ)

Q: Can VS-6CWQ04FN-M3 be used as a direct replacement for 6CWQ04FN?

A: Yes. VS-6CWQ04FN-M3 is a parametric equivalent with identical electrical specifications: 40 V reverse voltage, 3.5 A average rectified current per diode, 530 mV forward voltage @ 3 A, and 1 Pair Common Cathode configuration. Both are packaged in TO-252-3 DPAK. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 versus non-compliant). Pin-to-pin and footprint compatibility is confirmed.

Q: What is the difference between VS-6CWQ04FN-M3 and VS-6CWQ04FNHM3?

A: Both are parametric equivalents with identical electrical specifications. VS-6CWQ04FNHM3 carries AEC-Q101 automotive qualification and is designated as Automotive grade, making it suitable for automotive applications requiring qualification documentation. VS-6CWQ04FN-M3 does not carry automotive qualification. Both are ROHS3 compliant and Active.

Q: Can I use RB085BM-40FHTL as a substitute if my circuit only requires 3.5 A?

A: Yes. RB085BM-40FHTL is rated for 10 A average rectified current, which exceeds the 3.5 A requirement of the original 6CWQ04FN. Higher current ratings are acceptable substitutes in applications requiring lower current. The 40 V reverse voltage rating matches the original specification. Diode pair common cathode configuration and TO-252-3 DPAK package are identical. RB085BM-40FHTL is AEC-Q101 qualified and ROHS3 compliant.

Q: Why are STPS1045B and STPS1045B-TR listed but not recommended?

A: STPS1045B and STPS1045B-TR are single-diode devices, not diode pair arrays with common cathode configuration. The 6CWQ04FN contains two diodes sharing a common cathode terminal, providing a specific pin configuration (2 Leads + Tab). Single-diode alternatives require circuit redesign and are not pin-compatible. These parts are listed in the provided substitute list but do not meet the configuration requirement for direct substitution.

Q: What is the difference between STPS15L45CB and the higher-current alternatives?

A: STPS15L45CB is rated for 7.5 A average rectified current, positioned between the original 3.5 A and the 10 A alternatives. It maintains 1 Pair Common Cathode configuration and TO-252-3 DPAK package. The forward voltage is 520 mV @ 7.5 A, closely matching the original 530 mV @ 3 A specification. STPS15L45CB is suitable for applications requiring moderate current increase with minimal forward voltage change.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed as Active are ROHS3 compliant. The original 6CWQ04FN is RoHS non-compliant. RoHS compliance is a key advantage of substitution for new product designs and applications subject to RoHS regulations.

Q: Can I use a 45 V rated part in a 40 V circuit?

A: Yes. Parts rated for 45 V reverse voltage (SBR1045CTLQ-13, STPS1045B, STPS1045B-TR, STPS15L45CB) are acceptable substitutes in circuits designed for 40 V operation. Higher voltage ratings provide additional safety margin against voltage transients and overvoltage conditions. No circuit modification is required.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tube packaging?

A: Packaging format affects supply and handling but does not alter electrical or mechanical specifications. Cut Tape (CT) & Digi-Reel® packaging is suitable for automated assembly lines. Tube packaging is suitable for manual assembly or lower-volume applications. Both formats maintain identical component specifications and TO-252-3 DPAK footprint. Selection depends on production volume and assembly process requirements.

Q: Is automotive qualification (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required for automotive applications and high-reliability systems where component qualification documentation is mandated. VS-6CWQ04FNHM3 and RB085BM-40FHTL carry AEC-Q101 qualification. Other alternatives do not carry this qualification. Verify application requirements before selecting a substitute.

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