TSF40L45C Equivalent & Substitute Parts

Part Overview

The TSF40L45C is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as a 1 Pair Common Cathode device rated for 45 V DC reverse voltage and 20 A average rectified current per diode. The component is packaged in a TO-220-3 Full Pack with isolated tab configuration for through-hole mounting applications.

The TSF40L45C is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Substitute components must maintain electrical compatibility within the specified parameter ranges while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
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	600 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack, Isolated Tab	—
Supplier Device Package	ITO-220AB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TSF40L45C is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Mounting Type: Through Hole
Package / Case: TO-220-3 Full Pack, Isolated Tab
Supplier Device Package: ITO-220AB

Current Rating Consideration: The TSF40L45C is rated for 20 A average rectified current per diode. Substitute parts are grouped into three categories based on current capacity:

Direct Equivalents (20 A rated): Parts with identical 20 A current rating provide direct functional replacement without derating considerations.
Lower Current Substitutes (7.5 A to 15 A rated): Parts with reduced current ratings (MBRF1545CT-E3/45 at 7.5 A, MBRF2045CT-E3/45 at 10 A, MBRF30H45CT-E3/45 at 15 A) are suitable only for applications where the actual operating current does not exceed the substitute part's rating.
Higher Current Substitutes (12.5 A rated): Parts with intermediate current ratings (MBRF2545CT-E3/45 at 12.5 A) provide additional design margin for applications operating below 20 A.

All substitute parts maintain the 45 V reverse voltage rating, Schottky technology, fast recovery speed characteristic, and TO-220-3 package configuration required for mechanical and electrical compatibility.

Parameter Comparison

Parameter	TSF40L45C	MBRF1545CT-E3/45	MBRF1545CTHE3/45	MBRF2045CT-E3/45	MBRF2045CTHE3/45	MBRF2545CT-E3/45	MBRF2545CT/45	MBRF30H45CT-E3/45	MBRF30H45CTHE3/45
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
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	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	20 A	7.5 A	7.5 A	10 A	10 A	12.5 A	12.5 A	15 A	15 A
Speed	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)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	-55 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 175°C	-65 to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab
Supplier Device Package	ITO-220AB	ITO-220AB	ITO-220AB	ITO-220AB	ITO-220AB	ITO-220AB	ITO-220AB	ITO-220AB	ITO-220AB
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	AEC-Q101	—	AEC-Q101	—	—	—	AEC-Q101

Engineering Selection Recommendations

Product Status Consideration: The TSF40L45C is classified as obsolete. All listed substitute parts are classified as active products with current manufacturing support. Selection of an active substitute part ensures long-term component availability and supply chain continuity.

RoHS Compliance: The TSF40L45C is ROHS3 compliant. For applications requiring maintained RoHS compliance, select substitute parts with ROHS3 Compliant status. The MBRF2545CT/45 is RoHS non-compliant and is not suitable for applications with RoHS requirements.

Automotive Qualification: Substitute parts designated with AEC-Q101 qualification (MBRF1545CTHE3/45, MBRF2045CTHE3/45, MBRF30H45CTHE3/45) are qualified for automotive applications. These parts are appropriate for designs requiring automotive-grade component certification.

Current Rating Selection:

For applications operating at or near 20 A, no direct 20 A equivalent is available among active products. The MBRF30H45CT-E3/45 at 15 A provides the highest current rating among active substitutes and is suitable for applications operating below 15 A.
For applications operating below 15 A, MBRF30H45CT-E3/45 or MBRF2545CT-E3/45 are appropriate selections.
For applications operating below 10 A, MBRF2045CT-E3/45 is appropriate.
For applications operating below 7.5 A, MBRF1545CT-E3/45 is appropriate.

Temperature Range: The MBRF30H45CT-E3/45 and MBRF30H45CTHE3/45 offer an extended operating temperature range of -65°C to 175°C, compared to the TSF40L45C range of -55°C to 150°C. These parts are suitable for applications requiring extended high-temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the MBRF30H45CT-E3/45 directly replace the TSF40L45C in all applications?

A: The MBRF30H45CT-E3/45 is mechanically and electrically compatible with the TSF40L45C in terms of package, configuration, voltage rating, and speed characteristics. However, the MBRF30H45CT-E3/45 is rated for 15 A average rectified current per diode, while the TSF40L45C is rated for 20 A. Direct replacement is appropriate only for applications where the actual operating current does not exceed 15 A.

Q: What is the difference between MBRF2545CT-E3/45 and MBRF2545CT/45?

A: Both parts are identical in electrical specifications and package configuration. The primary difference is RoHS compliance status: MBRF2545CT-E3/45 is ROHS3 compliant, while MBRF2545CT/45 is RoHS non-compliant. For new designs and applications with RoHS requirements, MBRF2545CT-E3/45 is the appropriate selection.

Q: Are the automotive-qualified variants (CTHE3/45 suffix) interchangeable with standard variants?

A: The automotive-qualified variants (MBRF1545CTHE3/45, MBRF2045CTHE3/45, MBRF30H45CTHE3/45) are electrically and mechanically identical to their standard counterparts (CT-E3/45 suffix). The CTHE3/45 designation indicates AEC-Q101 automotive qualification. These parts are interchangeable; automotive-qualified variants are appropriate for applications requiring automotive-grade certification.

Q: What is the significance of the "Isolated Tab" feature in the TO-220-3 package?

A: The isolated tab configuration means the mounting tab is electrically isolated from the diode circuit. This allows the component to be mounted directly to a heat sink without requiring an insulating washer or thermal interface material, simplifying thermal management in high-current applications.

Q: Why is no direct 20 A equivalent available among active products?

A: The TSF40L45C is an obsolete product from Taiwan Semiconductor Corporation. Current active Schottky diode array products in the 45 V class from Vishay General Semiconductor - Diodes Division are available in current ratings of 7.5 A, 10 A, 12.5 A, and 15 A. Applications requiring 20 A operation must either use the MBRF30H45CT-E3/45 at 15 A with design derating or employ alternative circuit topologies such as parallel diode configurations.

Q: Can substitute parts with lower current ratings be used in parallel to achieve higher current capacity?

A: Parallel operation of diodes is not addressed in the provided technical parameters and is outside the scope of this substitution reference. Circuit design considerations for parallel diode operation require detailed thermal and current-sharing analysis beyond component-level substitution criteria.

Q: What is the difference between Schottky and Standard diode technology in this context?

A: The TSF40L45C uses Schottky technology, characterized by lower forward voltage drop and faster recovery time compared to standard junction diodes. The STF30150CR listed in the substitute parts list uses Standard technology with a 150 V rating and Common Anode configuration. This part is not electrically compatible with the TSF40L45C due to different technology, voltage rating, and diode configuration, and is not a suitable substitute.

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