Equivalent & Substitute Parts for 20CTH03

Part Overview

The Vishay 20CTH03 is a fast recovery diode array in a 1 Pair Common Cathode configuration rated for 300V DC reverse voltage and 10A average rectified current per diode. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The 20CTH03 belongs to the FRED Pt® series and is housed in a TO-220-3 through-hole package suitable for power conversion and rectification applications.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	300 V
Current - Average Rectified (Io) (per Diode)	10 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 10 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	20 µA @ 300 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Technology	Standard

Substitute Part Grouping Explanation

Substitution of the 20CTH03 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Diode Configuration: 1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max): 300 V
Current - Average Rectified (Io) (per Diode): 10 A minimum
Mounting Type: Through Hole
Package / Case: TO-220-3 or compatible TO-220 variant
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 35 ns or faster
Voltage - Forward (Vf) (Max) @ If: 1.25 V @ 10 A or lower
Current - Reverse Leakage @ Vr: 20 µA @ 300 V or lower

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical and mechanical specifications) and Manufacturer Recommended Alternatives (functionally compatible with allowable parameter variations within the application envelope).

Parameter Comparison

Parameter	20CTH03	VS-20CTH03-M3	VS-20CTH03-M3P	STTH2003CT	BYV32E-300PQ	LQA32T300C
Manufacturer	Vishay	Vishay	Vishay	STMicroelectronics	WeEn Semiconductors	Power Integrations
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	300 V	300 V	300 V	300 V
Current - Average Rectified (Io) (per Diode)	10 A	10 A	10 A	10 A	10 A	16 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 10 A	1.25 V @ 10 A	1.25 V @ 10 A	1.25 V @ 10 A	1.25 V @ 10 A	1.9 V @ 16 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	35 ns	35 ns	13 ns
Current - Reverse Leakage @ Vr	20 µA @ 300 V	20 µA @ 300 V	20 µA @ 300 V	20 µA @ 300 V	20 µA @ 300 V	25 µA @ 300 V
Operating Temperature - Junction	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	175°C (Max)	175°C (Max)	150°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Technology	Standard	Standard	Standard	Standard	Standard	Schottky
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements):

The parts VS-20CTH03-M3 and VS-20CTH03-M3P are parametric equivalents of the 20CTH03, maintaining identical electrical specifications and TO-220-3 package compatibility. Both are active products with ROHS3 compliance, addressing the obsolescence and regulatory status of the original part. VS-20CTH03-M3 is available in tube packaging with 4377 units in stock, while VS-20CTH03-M3P is available with 1036 units in stock. These parts are direct functional replacements requiring no circuit modifications.

Manufacturer Recommended Alternatives:

STTH2003CT (STMicroelectronics) is a manufacturer-recommended alternative that matches all critical electrical parameters of the 20CTH03 with identical 10A current rating, 300V reverse voltage, and 35ns reverse recovery time. It is ROHS3 compliant and active, with 60200 units in stock, providing superior availability. The operating temperature maximum is specified as 175°C rather than a range, which is within the original part's operating envelope.

BYV32E-300PQ (WeEn Semiconductors) is a parametric equivalent offering identical electrical performance across all critical parameters. It is RoHS compliant and active, with 937 units in stock. The TO-220E package variant is mechanically compatible with TO-220-3 applications.

LQA32T300C (Power Integrations) is a manufacturer-recommended alternative with enhanced specifications. It provides 16A current rating (exceeding the 10A requirement), 300V reverse voltage, and superior reverse recovery time of 13ns. The Schottky technology differs from the standard technology of the original part, resulting in higher forward voltage (1.9V @ 16A). This part is RoHS compliant and active, with 987 units in stock. Selection of this part is appropriate for applications where the higher current rating and faster recovery time provide system benefits that offset the increased forward voltage drop.

Compliance and Availability Considerations:

All substitute parts are active products with current manufacturing status, addressing the obsolescence of the 20CTH03. All recommended alternatives meet RoHS compliance requirements. STTH2003CT offers the highest inventory availability at 60200 units. For applications requiring exact parametric matching with active product status, VS-20CTH03-M3 or STTH2003CT are preferred selections.

Frequently Asked Questions (FAQ)

Q: Can VS-20CTH03-M3 be used as a direct replacement for 20CTH03?

A: Yes. VS-20CTH03-M3 is a parametric equivalent with identical electrical specifications, diode configuration, voltage ratings, current ratings, reverse recovery time, and TO-220-3 package. It is an active product with ROHS3 compliance, making it a direct functional replacement.

Q: What is the difference between the Vishay substitutes (VS-20CTH03-M3, VS-20CTH03-M3P) and STTH2003CT?

A: All three parts are parametric equivalents with identical electrical performance. The primary differences are manufacturer (Vishay versus STMicroelectronics), packaging format (tube versus bulk), and inventory availability. STTH2003CT has significantly higher stock levels (60200 units). Selection depends on procurement preferences and supply chain requirements.

Q: Why is LQA32T300C listed as a manufacturer-recommended alternative rather than a direct equivalent?

A: LQA32T300C uses Schottky technology rather than standard technology, resulting in a higher forward voltage of 1.9V @ 16A compared to 1.25V @ 10A for the 20CTH03. Additionally, it provides 16A current rating versus 10A, and faster reverse recovery time of 13ns versus 35ns. While functionally compatible for 300V 10A applications, the different technology and enhanced specifications classify it as an alternative rather than a direct equivalent. It is suitable for applications where the enhanced performance characteristics are beneficial.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts (VS-20CTH03-M3, VS-20CTH03-M3P, STTH2003CT, BYV32E-300PQ, and LQA32T300C) are RoHS compliant, addressing the non-compliant status of the obsolete 20CTH03.

Q: Can BYV32E-300PQ be used in place of 20CTH03?

A: Yes. BYV32E-300PQ is a parametric equivalent with identical electrical specifications and TO-220-3 package compatibility. The TO-220E package variant is mechanically compatible with standard TO-220-3 applications. It is an active product with RoHS compliance.

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

A: Substitution compatibility is determined by: diode configuration (1 Pair Common Cathode), voltage rating (300V DC reverse), current rating (10A minimum per diode), forward voltage (1.25V @ 10A or lower), reverse recovery time (35ns or faster), reverse leakage current (20µA @ 300V or lower), mounting type (through hole), and package (TO-220-3 or compatible TO-220 variant). All substitute parts meet these criteria.

Q: Is the operating temperature range important for substitution?

A: The 20CTH03 specifies an operating temperature range of -65°C to 175°C. Substitute parts specify either the same range or a maximum temperature of 175°C. For applications operating within the -65°C to 175°C envelope, all substitute parts are compatible. Applications requiring operation below -65°C should confirm compatibility with the specific substitute part's minimum temperature specification.

Q: Which substitute part offers the best availability?

A: STTH2003CT offers the highest inventory availability with 60200 units in stock. This part is a parametric equivalent with identical electrical specifications and is ROHS3 compliant, making it suitable for applications requiring immediate procurement.

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