VS-40CTQ045PBF Equivalent & Substitute Parts

Part Overview

The VS-40CTQ045PBF is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 20 A average rectified current per diode in a Through Hole TO-220-3 package. The part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	20 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the VS-40CTQ045PBF is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode Configuration: 1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 20 A minimum
Voltage - Forward (Vf) (Max) @ If: 530 mV @ 20 A or lower
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction: -55°C ~ 150°C range

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: TO-220-3 (direct substitutes) or TO-247-3 (parametric equivalents with package change)

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into three categories: Direct Manufacturer Substitutes (same package, same manufacturer), Parametric Equivalents (same electrical performance, different package), and Manufacturer-Recommended Alternatives (different manufacturer, equivalent electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Diode Config	Technology	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Package	Temp Range	Status
VS-40CTQ045PBF	Vishay	1 Pair Common Cathode	Schottky	45 V	20 A	530 mV @ 20 A	TO-220-3	-55°C ~ 150°C	Discontinued
VS-40CTQ045-M3	Vishay	1 Pair Common Cathode	Schottky	45 V	20 A	680 mV @ 40 A	TO-220-3	-55°C ~ 150°C	Active
VS-40L45CW-N3	Vishay	1 Pair Common Cathode	Schottky	45 V	20 A	530 mV @ 20 A	TO-247-3	-55°C ~ 150°C	Active
VS-STPS40L45CW-N3	Vishay	1 Pair Common Cathode	Schottky	45 V	20 A	530 mV @ 20 A	TO-247-3	-55°C ~ 150°C	Active
SBR4040CT	Diodes Incorporated	1 Pair Common Cathode	Super Barrier	40 V	20 A	530 mV @ 20 A	TO-220-3	-65°C ~ 150°C	Active
STPS40L45CT	STMicroelectronics	1 Pair Common Cathode	Schottky	45 V	20 A	530 mV @ 20 A	TO-220-3	-55°C ~ 150°C	Active
SB4045LCT_T0_00001	Panjit International Inc.	1 Pair Common Cathode	Schottky	45 V	20 A	530 mV @ 20 A	TO-220-3	-55°C ~ 150°C	Active
STPS40L45CW	STMicroelectronics	1 Pair Common Cathode	Schottky	45 V	20 A	530 mV @ 20 A	TO-247-3	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Package Replacement (TO-220-3):

For applications requiring identical mechanical fit and pin configuration, the following parts provide direct substitution:

STPS40L45CT (STMicroelectronics): Active product status with 45 V reverse voltage rating, 20 A current rating, and 530 mV forward voltage specification. Schottky technology with fast recovery characteristics. ROHS3 compliant.
SB4045LCT_T0_00001 (Panjit International Inc.): Active product status with matching electrical specifications. Schottky technology, 45 V reverse voltage, 20 A current rating, and 530 mV forward voltage. ROHS3 compliant with -55°C to 150°C operating range.
VS-40CTQ045-M3 (Vishay): Direct manufacturer alternative in active production. Same package and configuration. Forward voltage specification of 680 mV @ 40 A indicates different operating point characterization but maintains 45 V reverse voltage and 20 A current rating. ROHS3 compliant.

Alternative Technology (TO-220-3):

SBR4040CT (Diodes Incorporated): Super Barrier technology alternative with 40 V reverse voltage rating (5 V lower than original specification). Maintains 20 A current rating and 530 mV forward voltage. Extended operating temperature range of -65°C to 150°C. ROHS3 compliant. Suitable for applications where 40 V reverse voltage rating is sufficient.

Package Alternative (TO-247-3):

For applications permitting package change to TO-247-3 with improved thermal characteristics:

VS-40L45CW-N3 (Vishay): Parametric equivalent with identical electrical specifications to the original part. 45 V reverse voltage, 20 A current rating, 530 mV forward voltage @ 20 A. Active product status. ROHS3 compliant.
VS-STPS40L45CW-N3 (Vishay): Parametric equivalent with matching electrical performance. 45 V reverse voltage, 20 A current rating, 530 mV forward voltage. Active product status. ROHS3 compliant.
STPS40L45CW (STMicroelectronics): Parametric equivalent in TO-247-3 package. 45 V reverse voltage, 20 A current rating, 530 mV forward voltage. Active product status. ROHS3 compliant.

All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can VS-40CTQ045-M3 be used as a direct replacement for VS-40CTQ045PBF?

A: Yes. Both parts share identical package (TO-220-3), diode configuration (1 Pair Common Cathode), reverse voltage rating (45 V), and current rating (20 A). The forward voltage specification differs (680 mV @ 40 A versus 530 mV @ 20 A), reflecting different measurement conditions rather than incompatibility. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between Schottky and Super Barrier technology in these diodes?

A: Both technologies are fast recovery diode types. The SBR4040CT uses Super Barrier technology while the original part uses Schottky technology. Both maintain the same forward voltage (530 mV @ 20 A) and fast recovery characteristics (≤ 500ns). The primary difference is the reverse voltage rating: SBR4040CT is rated for 40 V versus the original 45 V.

Q: Can I use a TO-247-3 package part as a substitute for a TO-220-3 package part?

A: TO-247-3 and TO-220-3 packages have different physical dimensions and pin layouts. Direct mechanical substitution is not possible without PCB redesign. However, TO-247-3 parts (VS-40L45CW-N3, VS-STPS40L45CW-N3, STPS40L45CW) provide identical electrical performance and may be used if the application circuit board can accommodate the larger package footprint.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This indicates the diode array contains two diodes sharing a common cathode connection. The three leads of the TO-220-3 package connect to: Anode 1, Anode 2, and Common Cathode. All substitute parts maintain this same configuration.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original VS-40CTQ045PBF specification.

Q: What is the significance of the -55°C to 150°C operating temperature range?

A: This range specifies the junction temperature limits for reliable operation. Most substitutes maintain this range. The SBR4040CT extends the lower limit to -65°C, providing wider temperature operation capability. All parts maintain the 150°C maximum junction temperature.

Q: Why does SBR4040CT have a lower reverse voltage rating (40 V) than the original part (45 V)?

A: SBR4040CT is rated for 40 V maximum reverse voltage, which is 5 V lower than the original 45 V specification. This part is suitable only for applications where the circuit design does not require the full 45 V reverse voltage rating. Verify circuit requirements before substitution.

Q: What is the difference between VS-40L45CW-N3 and VS-STPS40L45CW-N3?

A: Both parts are parametric equivalents with identical electrical specifications (45 V, 20 A, 530 mV forward voltage) in TO-247-3 packages. The primary difference is the base product number designation (40L45 versus STPS40), which reflects internal Vishay product line organization. Electrical performance and compatibility are equivalent.

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