20CTQ045 Equivalent & Substitute Parts

Part Overview

The 20CTQ045 is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 10 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in a Through Hole TO-220-3 format. The 20CTQ045 is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Equivalent alternatives maintain identical electrical and mechanical specifications while offering current product status and improved compliance certifications.

Key Parameters

Parameter	Specification
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	10 A
Voltage - Forward (Vf) (Max) @ If	640 mV @ 10 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 20CTQ045 is determined by strict equivalence across the following critical parameters: Schottky diode technology, 1 Pair Common Cathode configuration, 45 V maximum DC reverse voltage rating, 10 A average rectified current per diode, fast recovery speed characteristic (≤ 500 ns), Through Hole mounting type, and TO-220-3 package format. All identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional interchangeability in circuit applications. Variations in forward voltage drop, reverse leakage current, and operating temperature range are noted but do not preclude substitution when the primary ratings align. Compliance certifications and product status are secondary considerations that support selection for new designs and long-term supply continuity.

Parameter Comparison

Parameter	20CTQ045 (Vishay)	VS-20CTQ045HN3 (Vishay)	STPS2045CT (STMicroelectronics)	MBR2045CT-LJ-01 (Diodes Inc.)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics	Diodes Incorporated
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	10 A	10 A	10 A	10 A
Voltage - Forward (Vf) (Max) @ If	640 mV @ 10 A	640 mV @ 10 A	570 mV @ 10 A	640 mV @ 10 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)
Current - Reverse Leakage @ Vr	2 mA @ 45 V	2 mA @ 45 V	100 µA @ 45 V	100 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	175°C (Max)	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Qualification	Not specified	Yes	Not specified	Yes

Engineering Selection Recommendations

VS-20CTQ045HN3 (Vishay): This part is a parametric equivalent manufactured by the same supplier as the 20CTQ045. It maintains identical electrical specifications including 640 mV forward voltage drop and 2 mA reverse leakage current. The VS-20CTQ045HN3 is active in production, ROHS3 compliant, and carries AEC-Q101 automotive qualification. This part is the direct replacement for the obsolete 20CTQ045 and is recommended for applications requiring Vishay sourcing continuity or automotive-grade certification.

STPS2045CT (STMicroelectronics): This part meets all core electrical and mechanical requirements with identical 45 V and 10 A ratings. The STPS2045CT exhibits superior forward voltage performance at 570 mV versus 640 mV, resulting in lower power dissipation. It is active in production and ROHS3 compliant with high inventory availability. The operating temperature range specification differs (175°C maximum versus -55°C to 175°C range), which may be relevant for applications requiring extended low-temperature operation. This part is suitable for cost-optimized designs where forward voltage efficiency is a priority.

MBR2045CT-LJ-01 (Diodes Incorporated): This part provides parametric equivalence with 45 V and 10 A ratings and 640 mV forward voltage matching the original 20CTQ045. It is active in production, ROHS3 compliant, and carries AEC-Q101 automotive qualification. The operating temperature range is -55°C to 150°C, which is 25°C lower than the original specification at the upper limit. This part is suitable for automotive applications and general-purpose industrial use where the reduced maximum junction temperature is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the VS-20CTQ045HN3 be used as a direct replacement for the 20CTQ045?

A: Yes. The VS-20CTQ045HN3 is a parametric equivalent with identical electrical specifications, the same TO-220-3 package, and Through Hole mounting. It is manufactured by Vishay and maintains the same diode configuration, voltage rating, current rating, and forward voltage characteristics. The primary advantage is active product status and ROHS3 compliance.

Q: What is the difference between the STPS2045CT and the original 20CTQ045?

A: The STPS2045CT maintains the same 45 V reverse voltage, 10 A current rating, and TO-220-3 package. The key difference is forward voltage: STPS2045CT operates at 570 mV versus 640 mV for the 20CTQ045. This lower forward voltage results in reduced power dissipation and heat generation. The operating temperature specification differs, with STPS2045CT rated to 175°C maximum without a specified minimum temperature.

Q: Is the MBR2045CT-LJ-01 suitable for automotive applications?

A: Yes. The MBR2045CT-LJ-01 carries AEC-Q101 automotive qualification and is rated for -55°C to 150°C junction temperature operation. It meets the core electrical specifications of 45 V reverse voltage and 10 A current rating. The maximum junction temperature is 25°C lower than the original 20CTQ045, which should be evaluated against specific thermal design requirements.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All identified substitute parts use the TO-220-3 Through Hole package format, ensuring mechanical compatibility with existing PCB layouts and thermal management solutions designed for the 20CTQ045.

Q: What is the significance of the reverse leakage current differences between parts?

A: The 20CTQ045, VS-20CTQ045HN3, and MBR2045CT-LJ-01 specify 2 mA reverse leakage at 45 V, while the STPS2045CT specifies 100 µA. Lower reverse leakage current reduces standby power consumption and heat generation in applications with sustained reverse bias conditions. The STPS2045CT's lower leakage is advantageous for low-power or battery-operated circuits.

Q: Can these parts be used interchangeably in existing designs?

A: All substitute parts maintain the critical electrical parameters (45 V reverse voltage, 10 A current, Schottky technology, fast recovery speed) and the same TO-220-3 package. Interchangeability is supported for these core specifications. However, differences in forward voltage drop, reverse leakage current, and maximum operating temperature should be evaluated against specific circuit requirements and thermal constraints.

Q: What compliance advantages do the substitute parts offer over the 20CTQ045?

A: The 20CTQ045 is RoHS non-compliant. All substitute parts (VS-20CTQ045HN3, STPS2045CT, and MBR2045CT-LJ-01) are ROHS3 compliant. Additionally, VS-20CTQ045HN3 and MBR2045CT-LJ-01 carry AEC-Q101 automotive qualification, supporting use in regulated automotive and industrial applications.

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