43CTQ100STRL Equivalent & Substitute Parts

Part Overview

The 43CTQ100STRL is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 100 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount format with fast recovery characteristics suitable for high-frequency switching applications.

The 43CTQ100STRL is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Active alternatives with identical or comparable electrical and mechanical specifications are available from Vishay and other manufacturers.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io) (per Diode)	20	A
Voltage - Forward (Vf) (Max) @ If	810 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1	mA @ 100 V
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 43CTQ100STRL is determined by the following critical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io) (per Diode): 20 A
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 810 mV @ 20 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction: -55°C to 175°C

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Identical Electrical and Mechanical Specifications) Parts that match all primary substitution criteria and maintain the same electrical performance characteristics. These include Vishay variants with different packaging formats (Tape & Reel, Cut Tape, Tube) and automotive-grade qualified versions.

Category 2: Manufacturer Recommended Alternatives (Reduced Current Rating) Parts that maintain 100 V reverse voltage and TO-263-3 package compatibility but feature reduced current ratings (10 A to 15 A per diode). These are suitable for applications where the full 20 A rating is not required. Current reductions result in lower forward voltage drops and improved thermal characteristics.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status	RoHS Status
43CTQ100STRL	Vishay	100 V	20 A	810 mV @ 20 A	1 mA @ 100 V	-55 to 175°C	TO-263-3	Obsolete	RoHS non-compliant
VB40100G-E3/8W	Vishay	100 V	20 A	810 mV @ 20 A	500 µA @ 100 V	-40 to 150°C	TO-263-3	Active	ROHS3 Compliant
VS-43CTQ100SHM3	Vishay	100 V	20 A	810 mV @ 20 A	1 mA @ 100 V	-55 to 175°C	TO-263-3	Active	ROHS3 Compliant
VS-43CTQ100STRL-M3	Vishay	100 V	20 A	810 mV @ 20 A	1 mA @ 100 V	-55 to 175°C	TO-263-3	Active	ROHS3 Compliant
VS-43CTQ100STRR-M3	Vishay	100 V	20 A	810 mV @ 20 A	1 mA @ 100 V	-55 to 175°C	TO-263-3	Active	ROHS3 Compliant
VS-43CTQ100STRRHM3	Vishay	100 V	20 A	810 mV @ 20 A	1 mA @ 100 V	-55 to 175°C	TO-263-3	Active	ROHS3 Compliant
MBRB20100CTT4G	onsemi	100 V	10 A	850 mV @ 10 A	100 µA @ 100 V	-65 to 175°C	TO-263-3	Active	ROHS3 Compliant
STPS20170CG-TR	STMicroelectronics	170 V	10 A	900 mV @ 10 A	15 µA @ 170 V	Max 175°C	TO-263-3	Active	ROHS3 Compliant
STPS20H100CG	STMicroelectronics	100 V	10 A	770 mV @ 10 A	4.5 µA @ 100 V	Max 175°C	TO-263-3	Active	ROHS3 Compliant
STPS20H100CG-TR	STMicroelectronics	100 V	10 A	770 mV @ 10 A	4.5 µA @ 100 V	Max 175°C	TO-263-3	Active	ROHS3 Compliant
STPS30170CG-TR	STMicroelectronics	170 V	15 A	920 mV @ 15 A	20 µA @ 170 V	Max 175°C	TO-263-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Drop-In Replacement)

The following parts provide identical electrical specifications and mechanical compatibility with the 43CTQ100STRL:

VS-43CTQ100STRL-M3: Active Vishay part with Cut Tape & Digi-Reel packaging. Maintains all electrical parameters including 20 A current rating, 100 V reverse voltage, and -55°C to 175°C operating range. ROHS3 compliant.
VS-43CTQ100STRR-M3: Active Vishay part with Tape & Reel packaging. Identical electrical specifications to the original part. ROHS3 compliant.
VS-43CTQ100SHM3: Active Vishay part with Tube packaging. Maintains full electrical compatibility including automotive-grade qualification (AEC-Q101). ROHS3 compliant.
VS-43CTQ100STRRHM3: Active Vishay part with Tape & Reel packaging and automotive-grade qualification (AEC-Q101). Identical electrical specifications. ROHS3 compliant.

These four parts are functionally interchangeable with the obsolete 43CTQ100STRL and require no circuit modifications.

Alternative with Reduced Current Rating (Conditional Substitution)

VB40100G-E3/8W: Vishay TMBS® series part rated for 20 A current. Operating temperature range is reduced to -40°C to 150°C compared to the original -55°C to 175°C. Reverse leakage is improved (500 µA vs. 1 mA @ 100 V). Suitable for applications not requiring the full temperature range. ROHS3 compliant.

Reduced Current Alternatives (10 A Rating)

The following parts maintain 100 V reverse voltage and TO-263-3 package compatibility but are rated for 10 A per diode:

MBRB20100CTT4G (onsemi): 10 A rating, 850 mV forward voltage @ 10 A, extended temperature range -65°C to 175°C. ROHS3 compliant.
STPS20H100CG and STPS20H100CG-TR (STMicroelectronics): 10 A rating, 770 mV forward voltage @ 10 A, improved reverse leakage (4.5 µA @ 100 V). ROHS3 compliant.

These 10 A alternatives are suitable only for applications where the circuit design permits reduced current capacity.

Higher Voltage Alternatives (170 V Rating)

STPS20170CG-TR (STMicroelectronics): 170 V reverse voltage, 10 A current rating. Suitable for applications requiring higher voltage margin.
STPS30170CG-TR (STMicroelectronics): 170 V reverse voltage, 15 A current rating. Provides higher voltage capability with moderate current capacity.

These higher voltage parts are suitable only when circuit requirements permit voltage derating.

Frequently Asked Questions (FAQ)

Q: Can VS-43CTQ100STRL-M3 be used as a direct replacement for 43CTQ100STRL?

A: Yes. VS-43CTQ100STRL-M3 is a parametric equivalent with identical electrical specifications (100 V, 20 A, 810 mV forward voltage, -55°C to 175°C operating range) and identical TO-263-3 package. The part is active and ROHS3 compliant. No circuit modifications are required.

Q: What is the difference between VS-43CTQ100STRL-M3, VS-43CTQ100STRR-M3, and VS-43CTQ100SHM3?

A: These three parts are electrically identical. The differences are in packaging format: VS-43CTQ100STRL-M3 is supplied in Cut Tape & Digi-Reel format, VS-43CTQ100STRR-M3 is supplied in Tape & Reel format, and VS-43CTQ100SHM3 is supplied in Tube format. VS-43CTQ100SHM3 and VS-43CTQ100STRRHM3 include automotive-grade qualification (AEC-Q101). Select based on your procurement and assembly requirements.

Q: Can I use STPS20H100CG-TR instead of 43CTQ100STRL?

A: STPS20H100CG-TR maintains the 100 V reverse voltage and TO-263-3 package but is rated for 10 A per diode instead of 20 A. This part is suitable only if your circuit design operates at 10 A or below. The forward voltage is lower (770 mV @ 10 A vs. 810 mV @ 20 A), and reverse leakage is significantly improved (4.5 µA vs. 1 mA @ 100 V). Verify that your application does not require the full 20 A rating before substitution.

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

A: This indicates the diode array contains two independent Schottky diodes sharing a common cathode connection. The configuration is essential for certain rectifier and switching applications. All listed substitute parts maintain this same configuration.

Q: Is the 43CTQ100STRL RoHS compliant?

A: No. The 43CTQ100STRL is RoHS non-compliant. All recommended active substitutes (VS-43CTQ100STRL-M3, VS-43CTQ100STRR-M3, VS-43CTQ100SHM3, VS-43CTQ100STRRHM3) are ROHS3 compliant, making them suitable for applications with RoHS requirements.

Q: Can I use VB40100G-E3/8W if my circuit operates at temperatures below -40°C?

A: No. VB40100G-E3/8W has a minimum operating temperature of -40°C, whereas the original 43CTQ100STRL operates down to -55°C. If your application requires operation below -40°C, use VS-43CTQ100STRL-M3, VS-43CTQ100STRR-M3, VS-43CTQ100SHM3, or VS-43CTQ100STRRHM3, which all maintain the -55°C minimum temperature rating.

Q: What is the significance of the "M3" suffix in Vishay part numbers?

A: The "M3" suffix indicates the part is supplied in Digi-Reel packaging format, which is Vishay's proprietary tape and reel system. This affects procurement and assembly handling but does not change electrical specifications.

Q: Are automotive-grade versions available?

A: Yes. VS-43CTQ100SHM3 and VS-43CTQ100STRRHM3 are automotive-grade parts qualified to AEC-Q101 standard. These are suitable for automotive and high-reliability applications requiring automotive qualification.

Q: What is the difference between MBRB20100CTT4G and STPS20H100CG-TR?

A: Both parts are rated for 10 A per diode at 100 V reverse voltage in TO-263-3 package. MBRB20100CTT4G (onsemi) has a forward voltage of 850 mV @ 10 A and extended temperature range (-65°C to 175°C). STPS20H100CG-TR (STMicroelectronics) has a lower forward voltage of 770 mV @ 10 A and significantly lower reverse leakage (4.5 µA vs. 100 µA @ 100 V). Select based on thermal performance requirements and leakage specifications for your application.

Q: Can I use a 170 V rated part in a 100 V circuit?

A: Yes. STPS20170CG-TR and STPS30170CG-TR are rated for 170 V reverse voltage and can be used in 100 V circuits. However, these parts have reduced current ratings (10 A and 15 A respectively) compared to the original 20 A rating. Verify that your circuit design accommodates the reduced current capacity before substitution.

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