TST40L45CW Equivalent & Substitute Parts

Part Overview

The TST40L45CW is a Schottky diode rectifier manufactured by Taiwan Semiconductor Corporation, rated for 45 V DC reverse voltage and 20 A average rectified current in a Through Hole TO-220AB package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating the Through Hole TO-220-3 package standard.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	590 mV @ 20 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 45 V
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TST40L45CW is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-3 or equivalent
Technology: Must be Schottky
Speed: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Current Rating Consideration: Substitute parts are grouped by current capacity. The TST40L45CW operates at 20 A average rectified current. Substitute parts with equal or higher current ratings are electrically compatible. Parts with lower current ratings do not meet the minimum operational requirement.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and operate within the specified temperature range.

The three identified substitute parts meet the mandatory voltage, package, and technology requirements. However, they differ in current capacity and configuration, which affects their suitability for direct replacement.

Parameter Comparison

Parameter	TST40L45CW	DSA60C45PB	MBR2545CTG	MBR2550CT
Manufacturer	Taiwan Semiconductor Corporation	IXYS	onsemi	Diodes Incorporated
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	50 V
Current - Average Rectified (Io)	20 A	30 A (per diode)	15 A (per diode)	15 A (per diode)
Voltage - Forward (Vf) (Max) @ If	590 mV @ 20 A	790 mV @ 30 A	620 mV @ 15 A	750 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 45 V	900 µA @ 45 V	200 µA @ 45 V	1 mA @ 50 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Operating Temperature - Junction	-55 to 150°C	-55 to 175°C	-65 to 175°C	-65 to 150°C
Technology	Schottky	Schottky	Schottky	Schottky
Diode Configuration	Single Diode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DSA60C45PB (IXYS)

The DSA60C45PB is an active product with 30 A per diode current capacity, exceeding the TST40L45CW requirement of 20 A. It maintains 45 V reverse voltage rating and operates across an extended temperature range (-55 to 175°C). The part is configured as a 1 Pair Common Cathode diode array in TO-220-3 package. This configuration requires circuit design consideration, as the dual-diode arrangement differs from the single-diode TST40L45CW. The higher current rating provides operational margin. ROHS3 compliance is maintained.

MBR2545CTG (onsemi)

The MBR2545CTG is an active product from the SWITCHMODE™ series with 15 A per diode current capacity. This rating falls below the TST40L45CW specification of 20 A and does not meet the minimum current requirement for direct replacement. The part maintains 45 V reverse voltage rating and operates across -65 to 175°C. Configuration is 1 Pair Common Cathode in TO-220-3 package. ROHS3 compliance is maintained. This part is suitable only for applications with reduced current demands.

MBR2550CT (Diodes Incorporated)

The MBR2550CT is an obsolete product with 15 A per diode current capacity, which falls below the TST40L45CW specification of 20 A. The reverse voltage rating is 50 V, exceeding the 45 V requirement. Configuration is 1 Pair Common Cathode in TO-220-3 package. Operating temperature range is -65 to 150°C. ROHS3 compliance is maintained, but REACH status is affected. The lower current rating and obsolete status make this part unsuitable for new designs.

Primary Recommendation:

DSA60C45PB is the only substitute part that meets or exceeds all electrical parameters of the TST40L45CW while maintaining active product status. Circuit design must accommodate the dual-diode common cathode configuration.

Frequently Asked Questions (FAQ)

Q: Can MBR2545CTG or MBR2550CT directly replace the TST40L45CW?

A: No. Both parts have 15 A per diode current capacity, which is below the TST40L45CW specification of 20 A. Direct replacement would result in insufficient current handling capacity.

Q: Why is DSA60C45PB suitable despite having a different diode configuration?

A: The DSA60C45PB is configured as a 1 Pair Common Cathode diode array. While this differs from the single-diode TST40L45CW, the electrical parameters (45 V reverse voltage, 30 A per diode current, Fast Recovery Schottky technology, TO-220-3 package) are compatible. Circuit design must account for the dual-diode configuration and common cathode connection.

Q: What is the significance of the TO-220-3 package requirement?

A: The TO-220-3 package is a Through Hole standard with three leads. All substitute parts use this package, ensuring mechanical and thermal compatibility with existing PCB layouts and mounting hardware.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. DSA60C45PB, MBR2545CTG, and MBR2550CT are all ROHS3 compliant. The TST40L45CW is also ROHS3 compliant.

Q: What is the impact of the diode array configuration on circuit design?

A: The substitute parts are diode arrays with 1 Pair Common Cathode configuration. This means two diodes share a common cathode connection. Circuit design must verify that the application can accommodate this configuration or that only one diode per array is utilized.

Q: Does the higher reverse voltage rating of MBR2550CT (50 V vs. 45 V) provide an advantage?

A: The higher reverse voltage rating provides additional safety margin against overvoltage conditions. However, the insufficient current rating (15 A vs. 20 A required) disqualifies this part for direct replacement.

Q: What is the operating temperature range consideration?

A: The TST40L45CW operates from -55 to 150°C. DSA60C45PB and MBR2545CTG extend this range to 175°C, providing wider operational capability. MBR2550CT maintains the 150°C upper limit. All parts meet the minimum temperature requirement.

Q: Why is product status (Active vs. Obsolete) relevant?

A: Active products have ongoing manufacturing and supply availability. Obsolete products have limited or no future availability. DSA60C45PB and MBR2545CTG are active products, ensuring long-term procurement viability. MBR2550CT is obsolete, limiting its suitability for new designs.

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