TSF20L120C Equivalent & Substitute Parts

Part Overview

The TSF20L120C is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as a 1 Pair Common Cathode with 120 V reverse voltage rating and 10 A average rectified current per diode. The device is packaged in TO-220-3 Full Pack with isolated tab for through-hole mounting applications.

The TSF20L120C carries a product status of "Not For New Designs," indicating it is obsolete or being phased out. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for existing applications.

Substiute Parts

TSF20L120C

Taiwan Semiconductor CorporationIn Stock: 1261TSF20L120C Datasheet

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STF12100

SMC Diode SolutionsIn Stock: 1180STF12100 Datasheet

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STF20120C

SMC Diode SolutionsIn Stock: 2016STF20120C Datasheet

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VF20120C-E3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 28428VF20120C-E3/4W Datasheet

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VF20M120C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 1434VF20M120C-M3/4W Datasheet

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VF30120C-E3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 5157VF30120C-E3/4W Datasheet

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VF30120C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 960VF30120C-M3/4W Datasheet

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VF40120C-E3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 1310VF40120C-E3/4W Datasheet

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VF40120C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 779VF40120C-M3/4W Datasheet

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VF40M120C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 983VF40M120C-M3/4W Datasheet

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VF60120C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 1636VF60120C-M3/4W Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TSF20L120C is determined by the following critical parameters:

Primary Substitution Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 120 V
• Mounting Type: Through Hole
• Package / Case: TO-220-3 Full Pack, Isolated Tab
• Supplier Device Package: ITO-220AB

Secondary Compatibility Parameters:

• Current - Average Rectified (Io) (per Diode): 10 A or higher
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature - Junction: -55°C to 150°C or wider range
• RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (10 A Rating) Parts with identical 10 A current rating and matching electrical characteristics. These provide pin-for-pin and functional equivalence.

Category 2: Higher Current Alternatives (15 A, 20 A, 30 A Ratings) Parts with increased current ratings (15 A, 20 A, 30 A) that maintain all other critical parameters. These are suitable for applications where the TSF20L120C current rating is adequate but higher current capability is available or preferred.

Category 3: Lower Voltage Alternative (100 V Rating) The STF12100 operates at 100 V reverse voltage with 12 A current rating. This part is included for applications where 100 V reverse voltage is acceptable and higher current capacity is beneficial.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Selection (10 A Current Rating)

For applications requiring exact functional equivalence to the TSF20L120C, the following parts are recommended:

VF20120C-E3/4W (Vishay General Semiconductor - Diodes Division) is the primary direct equivalent. This part maintains identical 10 A current rating, 120 V reverse voltage, and TO-220-3 ITO-220AB package configuration. The part carries Active product status and ROHS3 compliance. Operating temperature range is -40°C to 150°C, which is narrower than the original part's -55°C to 150°C range. Forward voltage is 900 mV @ 10 A compared to 920 mV for the original part.

VF20M120C-M3/4W (Vishay General Semiconductor - Diodes Division) provides equivalent functionality with identical electrical specifications and package configuration. This part also carries Active product status and ROHS3 compliance. Operating temperature range is -40°C to 150°C. Forward voltage is 910 mV @ 10 A.

STF20120C (SMC Diode Solutions) is an alternative direct equivalent with Active product status and ROHS3 compliance. This part maintains the 120 V reverse voltage and TO-220-3 ITO-220AB package. Forward voltage is 900 mV @ 10 A. Operating temperature range is -55°C to 150°C, matching the original part's temperature specification.

Higher Current Alternatives (15 A, 20 A, 30 A Ratings)

For applications where higher current capacity is beneficial or required:

VF30120C-E3/4W and VF30120C-M3/4W (Vishay General Semiconductor - Diodes Division) provide 15 A current rating with identical 120 V reverse voltage and TO-220-3 package. Both carry Active product status and ROHS3 compliance. Operating temperature range is -40°C to 150°C.

VF40120C-E3/4W, VF40120C-M3/4W, and VF40M120C-M3/4W (Vishay General Semiconductor - Diodes Division) provide 20 A current rating with identical 120 V reverse voltage and TO-220-3 package. All carry Active product status and ROHS3 compliance. Operating temperature range is -40°C to 150°C.

VF60120C-M3/4W (Vishay General Semiconductor - Diodes Division) provides 30 A current rating with identical 120 V reverse voltage and TO-220-3 package. This part carries Active product status and ROHS3 compliance. Operating temperature range is -40°C to 150°C.

Lower Voltage Alternative (100 V Rating)

STF12100 (SMC Diode Solutions) operates at 100 V reverse voltage with 12 A current rating. This part is suitable only for applications where 100 V reverse voltage is acceptable. The part carries Active product status and ROHS3 compliance. Package configuration is TO-220-2 Full Pack, Isolated Tab (ITO-220AC), which differs from the original TO-220-3 configuration. This part is not pin-compatible with the TSF20L120C.

Compliance and Regulatory Considerations

All substitute parts listed carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance profile. All parts are classified under HTSUS 8541.10.0080 and ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can VF20120C-E3/4W be used as a direct replacement for TSF20L120C?

A: VF20120C-E3/4W is functionally equivalent with identical 10 A current rating, 120 V reverse voltage, and TO-220-3 ITO-220AB package. The part is pin-compatible and electrically compatible. The operating temperature range is -40°C to 150°C compared to the original -55°C to 150°C. Forward voltage is 900 mV @ 10 A versus 920 mV for the original part. Selection depends on whether the narrower temperature range and slightly lower forward voltage are acceptable for the application.

Q: What is the difference between VF20M120C-M3/4W and VF20120C-E3/4W?

A: Both parts provide identical electrical specifications with 10 A current rating and 120 V reverse voltage. The primary difference is the product designation suffix, which may indicate different manufacturing processes or quality grades. Both carry Active product status, ROHS3 compliance, and -40°C to 150°C operating temperature range. Forward voltage specifications are 910 mV @ 10 A for VF20M120C-M3/4W and 900 mV @ 10 A for VF20120C-E3/4W.

Q: Can higher current rated parts (VF30120C, VF40120C, VF60120C) be used in place of TSF20L120C?

A: Higher current rated parts maintain identical 120 V reverse voltage and TO-220-3 package configuration, making them pin-compatible and electrically compatible. These parts are suitable for applications where the TSF20L120C current rating is adequate but higher current capacity is available. The application circuit must be designed to operate within the TSF20L120C's 10 A current specification; the higher rated parts do not increase the circuit's current capability unless the circuit design is modified.

Q: Why is STF12100 listed as a substitute if it has a different voltage rating?

A: STF12100 is included as an alternative for applications where 100 V reverse voltage is acceptable and 12 A current capacity is beneficial. This part is not a direct replacement and requires circuit evaluation to confirm that 100 V reverse voltage is sufficient for the application. The package configuration (TO-220-2) also differs from the original TO-220-3, affecting pin compatibility.

Q: What is the significance of the operating temperature range difference between TSF20L120C (-55°C to 150°C) and most substitute parts (-40°C to 150°C)?

A: The TSF20L120C operates at -55°C minimum junction temperature, while most Vishay substitute parts operate at -40°C minimum. For applications requiring operation below -40°C, STF20120C or STF12100 are preferred alternatives as they maintain the -55°C lower temperature limit. For applications operating above -40°C, the narrower temperature range of Vishay parts is not a limiting factor.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed carry ROHS3 compliance, matching the original TSF20L120C. All parts also carry MSL 1 (Unlimited) moisture sensitivity rating and are classified under HTSUS 8541.10.0080 and ECCN EAR99.

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

A: This configuration indicates the diode array contains two independent Schottky diodes with a common cathode connection. The three-pin TO-220-3 package provides two anode connections and one shared cathode connection. This configuration is suitable for bridge rectifier applications and dual-diode circuits where a common cathode reference is required.

Q: Can STF20120C be used as a substitute despite higher reverse leakage current (700 µA vs. 100 µA)?

A: STF20120C maintains identical electrical ratings and package configuration. The higher reverse leakage current (700 µA @ 120 V compared to 100 µA @ 120 V) may affect circuit performance in applications sensitive to leakage current. Circuit evaluation is necessary to determine if the higher leakage current is acceptable for the specific application.

Q: What is the difference between ITO-220AB and ITO-220AC package designations?

A: ITO-220AB is a three-pin TO-220 package with isolated tab, used for diode array configurations with common cathode (TSF20L120C and most substitutes). ITO-220AC is a two-pin TO-220 package with isolated tab, used for single diode configurations (STF12100). These packages are not interchangeable; pin count and configuration differ.