STPS20120CFP Equivalent & Substitute Parts

Part Overview

The STPS20120CFP 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 Full Pack through-hole configuration. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance applications.

Substiute Parts

STPS20120CFP

STMicroelectronicsIn Stock: 871STPS20120CFP Datasheet

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DSTF20120C

Littelfuse Inc.In Stock: 850DSTF20120C Datasheet

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MBR20200CTG

onsemiIn Stock: 55244MBR20200CTG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS20120CFP 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 minimum
• Current - Average Rectified (Io) (per Diode): 10 A minimum
• Mounting Type: Through Hole
• Package compatibility: TO-220-3 form factor

Secondary Compatibility Factors:

• Forward voltage (Vf) characteristics
• Reverse leakage current specifications
• Operating temperature range
• RoHS and regulatory compliance status

Substitute parts must meet or exceed the primary electrical specifications while maintaining mechanical compatibility with TO-220-3 through-hole mounting. Parts with higher voltage ratings remain compatible for applications requiring 120 V operation. Package variations (isolated tab vs. standard tab) are acceptable provided the TO-220-3 footprint is maintained.

Parameter Comparison

Engineering Selection Recommendations

DSTF20120C (Littelfuse Inc.) - Primary Substitute

The DSTF20120C is the closest functional equivalent to the STPS20120CFP. Both devices share identical diode configuration, voltage rating, and current specifications. The DSTF20120C is currently in active production status, ensuring long-term availability and supply chain continuity. The part maintains ROHS3 compliance and REACH unaffected status. The isolated tab variant of the TO-220-3 package provides enhanced electrical isolation in applications requiring it. Forward voltage performance is marginally superior (900 mV vs. 920 mV @ 10 A). The maximum junction temperature of 150°C is 25°C lower than the original part; this difference is acceptable for most applications operating within standard industrial temperature ranges.

MBR20200CTG (onsemi) - Secondary Substitute

The MBR20200CTG is a higher voltage-rated alternative suitable for applications where 120 V operation is required but additional voltage margin is beneficial. This device maintains the same current rating (10 A) and diode configuration while providing 200 V reverse voltage capability. The part is in active production with ROHS3 compliance and REACH unaffected status. The maximum junction temperature of 175°C matches the original STPS20120CFP specification. The MBR20200CTG is part of the onsemi SWITCHMODE™ series, indicating optimization for switching applications. This substitute is appropriate for designs where voltage derating or future specification changes may require higher voltage tolerance.

Both substitute parts are electrically and mechanically compatible with the STPS20120CFP within the specified application parameters.

Frequently Asked Questions (FAQ)

Q: Can the DSTF20120C directly replace the STPS20120CFP in existing designs?

A: Yes. Both parts share identical diode configuration (1 pair common cathode), voltage rating (120 V), current rating (10 A per diode), and TO-220-3 through-hole package footprint. The DSTF20120C features an isolated tab variant, which provides enhanced electrical isolation but maintains mechanical compatibility with standard TO-220-3 mounting.

Q: What is the significance of the isolated tab in the DSTF20120C package?

A: The isolated tab (ITO-220AB) provides electrical isolation between the tab and the diode cathode, reducing parasitic coupling in certain circuit topologies. This feature does not affect mechanical compatibility or electrical performance in applications where the tab is used for thermal management only.

Q: Why is the MBR20200CTG listed as a substitute if it has a higher voltage rating?

A: The MBR20200CTG is a valid substitute because it meets or exceeds all critical electrical specifications of the STPS20120CFP. The 200 V rating is backward compatible with 120 V applications, providing additional voltage margin. Higher voltage-rated Schottky diodes are acceptable substitutes in circuits designed for lower voltages.

Q: Are there temperature range differences between the substitutes and the original part?

A: Yes. The STPS20120CFP has a maximum junction temperature of 175°C. The DSTF20120C maximum is 150°C, while the MBR20200CTG matches the original at 175°C. For applications operating near thermal limits, the MBR20200CTG maintains identical temperature specifications. The DSTF20120C is suitable for applications with maximum junction temperatures below 150°C.

Q: Do all three parts maintain the same regulatory compliance?

A: Yes. The STPS20120CFP, DSTF20120C, and MBR20200CTG are all ROHS3 compliant and REACH unaffected, ensuring compatibility with current environmental and regulatory requirements.

Q: What is the difference in reverse leakage current between these parts?

A: The STPS20120CFP specifies 10 µA @ 120 V, the DSTF20120C specifies 700 µA @ 120 V, and the MBR20200CTG specifies 1 mA @ 200 V. Higher leakage current may affect applications with stringent low-current requirements. For standard rectification and switching applications, these differences are typically not significant.

Q: Can these parts be used interchangeably in PCB designs without layout modifications?

A: Yes. All three parts use the TO-220-3 through-hole package and share identical pin configurations for the diode array. PCB layouts designed for the STPS20120CFP accommodate both substitute parts without modification.