STPS20L120CT Equivalent & Substitute Parts

Part Overview

The STPS20L120CT is a Schottky diode array manufactured by STMicroelectronics, configured as 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 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts with compatible electrical and mechanical specifications are necessary for ongoing design support and procurement continuity.

Substiute Parts

STPS20L120CT

STMicroelectronicsIn Stock: 2558STPS20L120CT Datasheet

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NTST30120CTG

onsemiIn Stock: 2215NTST30120CTG Datasheet

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SBR20A120CT

Diodes IncorporatedIn Stock: 60352SBR20A120CT Datasheet

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SBR30A120CT

Diodes IncorporatedIn Stock: 19998SBR30A120CT Datasheet

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V60120C-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 1059V60120C-M3/4W Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS20L120CT is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Voltage - DC Reverse (Vr) (Max): 120 V minimum
• Mounting Type: Through Hole
• Package / Case: TO-220-3
• Current - Average Rectified (Io) (per Diode): 10 A minimum

Allowable Variation Parameters:

• Technology: Schottky or Super Barrier (both fast recovery rectifier technologies)
• Voltage - Forward (Vf): Acceptable within ±100 mV of specified value
• Current - Reverse Leakage @ Vr: Acceptable up to 800 µA @ 120 V
• Operating Temperature - Junction: Acceptable at 150°C or higher maximum rating

Substitute parts are grouped into two categories:

Category 1 - Direct Current Rating Match (10 A): SBR20A120CT maintains identical 10 A current rating with compatible electrical characteristics.

Category 2 - Higher Current Rating (15 A and 30 A): NTST30120CTG, SBR30A120CT, and V60120C-M3/4W provide higher current capacity while maintaining 120 V reverse voltage and TO-220-3 packaging. These parts are suitable for applications where the STPS20L120CT current rating is marginal or where design margin improvement is required.

Parameter Comparison

Engineering Selection Recommendations

SBR20A120CT (Diodes Incorporated)

SBR20A120CT is the primary substitute for direct replacement of STPS20L120CT. This part maintains identical 10 A current rating and 120 V reverse voltage specification. The device features Super Barrier technology with lower forward voltage drop (790 mV @ 10 A versus 860 mV @ 10 A), resulting in reduced power dissipation. SBR20A120CT holds active product status with extended operating temperature range (-65°C to 175°C) and ROHS3 compliance. Inventory availability is substantial at 60,300 pieces.

SBR30A120CT (Diodes Incorporated)

SBR30A120CT provides a higher current rating of 15 A while maintaining 120 V reverse voltage and TO-220-3 packaging. This part is suitable for applications requiring design margin improvement or where current demand exceeds the original 10 A specification. The device is active status with extended temperature range and ROHS3 compliance. Inventory availability is 19,903 pieces.

NTST30120CTG (onsemi)

NTST30120CTG offers 15 A current capacity with 120 V reverse voltage in TO-220-3 package. This part uses Schottky technology matching the original STPS20L120CT. However, forward voltage is elevated at 1.08 V @ 15 A, and reverse leakage current is higher at 800 µA @ 120 V. NTST30120CTG is classified as obsolete. This part is suitable only when higher current capacity is required and forward voltage elevation is acceptable for the application.

V60120C-M3/4W (Vishay General Semiconductor)

V60120C-M3/4W provides the highest current rating at 30 A with 120 V reverse voltage in TO-220-3 package. This part is active status with Schottky technology and ROHS3 compliance. Forward voltage is 950 mV @ 30 A. This part is suitable for applications requiring substantial design margin or where current demand significantly exceeds 10 A. Inventory availability is limited at 1,010 pieces.

Frequently Asked Questions (FAQ)

Q: Can SBR20A120CT be used as a direct replacement for STPS20L120CT?

A: Yes. SBR20A120CT maintains identical 10 A current rating, 120 V reverse voltage, and TO-220-3 packaging. Both devices are configured as 1 pair common cathode with fast recovery characteristics. The Super Barrier technology in SBR20A120CT provides lower forward voltage drop, which is beneficial for thermal performance.

Q: What is the difference between Schottky and Super Barrier technology in these diodes?

A: Both technologies are fast recovery rectifier types suitable for this application. Schottky technology is used in STPS20L120CT, NTST30120CTG, and V60120C-M3/4W. Super Barrier technology is used in SBR20A120CT and SBR30A120CT. Super Barrier devices typically exhibit lower forward voltage drop and lower reverse leakage current compared to standard Schottky devices at equivalent current ratings.

Q: Can I use a 15 A rated part (NTST30120CTG or SBR30A120CT) in place of the 10 A STPS20L120CT?

A: Yes. Higher current-rated parts are electrically compatible substitutes. The 15 A rating provides additional design margin and thermal headroom. All mandatory parameters (voltage rating, configuration, package, and mounting type) are satisfied. Forward voltage and reverse leakage characteristics differ slightly but remain within acceptable ranges for fast recovery rectifier applications.

Q: Why does V60120C-M3/4W have higher forward voltage than the original part?

A: Forward voltage increases with current rating in Schottky diode technology. V60120C-M3/4W is rated for 30 A, resulting in 950 mV @ 30 A forward voltage. At the original 10 A operating point, this part would exhibit lower forward voltage than specified at its rated current. The forward voltage specification is always provided at the device's rated current.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SBR20A120CT, NTST30120CTG, SBR30A120CT, and V60120C-M3/4W) are ROHS3 compliant, matching the compliance status of STPS20L120CT.

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

A: TO-220-3 indicates a three-lead through-hole package in the TO-220 form factor. All substitute parts use identical TO-220-3 packaging, ensuring mechanical and thermal compatibility with existing PCB layouts and heat sink mounting arrangements.

Q: Why is STPS20L120CT classified as obsolete?

A: Product status reflects manufacturer discontinuation. Obsolete classification indicates the part is no longer in active production. Active substitute parts (SBR20A120CT, SBR30A120CT, and V60120C-M3/4W) provide long-term design support and procurement continuity.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture control requirements. All listed parts carry MSL 1 rating, eliminating moisture-related handling constraints during storage and assembly.

Q: Can I use SBR30A120CT or V60120C-M3/4W if my circuit only requires 10 A?

A: Yes. Higher current-rated parts operate safely at lower current levels. The 15 A and 30 A ratings represent maximum continuous current capacity. Operating at 10 A with a 15 A or 30 A rated device provides thermal margin and extended component life.