STPS20L40CFP Equivalent & Substitute Parts

Part Overview

The STPS20L40CFP is a Schottky diode array manufactured by STMicroelectronics, configured as 1 pair common cathode with a maximum reverse voltage of 40 V and average rectified current of 10 A per diode. The device is packaged in a TO-220-3 Full Pack through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications.

Substiute Parts

STPS20L40CFP

STMicroelectronicsIn Stock: 2126STPS20L40CFP Datasheet

Current PartRFQ

RB085T-40NZC9

Rohm SemiconductorIn Stock: 2694RB085T-40NZC9 Datasheet

DirectRFQ

SBR4040CTFP

Diodes IncorporatedIn Stock: 2685SBR4040CTFP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS20L40CFP is determined by the following critical parameters:

Mandatory Matching Parameters:

• Diode Configuration: 1 Pair Common Cathode
• Voltage - DC Reverse (Vr) (Max): 40 V
• Mounting Type: Through Hole
• Package / Case: TO-220-3 Full Pack
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Compatible Variation Parameters:

• Current - Average Rectified (Io) (per Diode): Equal or greater than 10 A
• Voltage - Forward (Vf) (Max) @ If: Equal or lower than 550 mV
• Current - Reverse Leakage @ Vr: Equal or lower than 700 µA @ 40 V
• Operating Temperature - Junction (Max): Equal to or greater than 150°C
• Technology: Schottky or equivalent fast-recovery rectifier technology

The substitute parts listed maintain electrical compatibility within the specified parameter ranges while providing active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

RB085T-40NZC9 (Direct Equivalent)

The RB085T-40NZC9 from Rohm Semiconductor is classified as a direct equivalent to the STPS20L40CFP. Both devices share identical electrical specifications for reverse voltage (40 V), average rectified current (10 A per diode), and operating temperature maximum (150°C). The RB085T-40NZC9 maintains active product status, ensuring long-term availability. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 rating. The primary difference is the supplier device package designation (TO-220FN versus TO-220FPAB), which does not affect electrical or mechanical compatibility. This part is suitable for direct replacement in applications requiring identical electrical performance.

SBR4040CTFP (Similar Substitute)

The SBR4040CTFP from Diodes Incorporated is classified as a similar substitute with enhanced current capability. This device doubles the average rectified current rating to 20 A per diode while maintaining the same 40 V reverse voltage rating. The forward voltage is slightly lower (530 mV @ 20 A versus 550 mV @ 10 A), and reverse leakage is reduced to 500 µA @ 40 V. The SBR4040CTFP features an isolated tab configuration (ITO-220AB package) and an extended operating temperature range (-65°C to 150°C). All compliance certifications match the original part. This substitute is suitable for applications where increased current capacity or improved thermal performance is beneficial, provided the isolated tab configuration is compatible with the circuit board layout.

Frequently Asked Questions (FAQ)

Q: Can the RB085T-40NZC9 be used as a direct replacement for the STPS20L40CFP?

A: Yes. The RB085T-40NZC9 meets all electrical and mechanical requirements of the STPS20L40CFP. Both devices are configured as 1 pair common cathode Schottky diodes with 40 V reverse voltage and 10 A average rectified current per diode. The TO-220-3 Full Pack through-hole mounting is identical. Compliance certifications (ROHS3, REACH, MSL 1) are equivalent.

Q: What is the difference between the RB085T-40NZC9 and SBR4040CTFP?

A: The primary differences are current rating and package configuration. The RB085T-40NZC9 matches the original 10 A specification, while the SBR4040CTFP provides 20 A per diode. The SBR4040CTFP uses an isolated tab package (ITO-220AB) compared to the standard TO-220FN. The SBR4040CTFP also features a wider operating temperature range (-65°C to 150°C) and lower reverse leakage current (500 µA versus 700 µA).

Q: Are there any package compatibility concerns with the SBR4040CTFP?

A: The SBR4040CTFP uses an isolated tab configuration (ITO-220AB), whereas the STPS20L40CFP uses a standard TO-220-3 Full Pack (TO-220FPAB). The isolated tab design may require circuit board layout modifications if the tab isolation is critical to the application. Verify that the isolated tab configuration is compatible with your circuit design before substitution.

Q: Do all substitute parts meet the same compliance requirements as the original STPS20L40CFP?

A: Yes. Both the RB085T-40NZC9 and SBR4040CTFP are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original part's compliance profile.

Q: What is the significance of the reverse leakage current difference between the STPS20L40CFP and its substitutes?

A: The STPS20L40CFP specifies 700 µA @ 40 V reverse leakage. The RB085T-40NZC9 provides lower leakage at 200 µA @ 40 V, and the SBR4040CTFP at 500 µA @ 40 V. Lower reverse leakage improves efficiency and reduces heat generation in applications with sustained reverse bias conditions. This represents an improvement over the original specification.

Q: Can the SBR4040CTFP be used in applications designed for 10 A operation?

A: Yes. The SBR4040CTFP is rated for 20 A per diode, which exceeds the 10 A requirement of the original STPS20L40CFP. The device operates safely at lower current levels. The reduced forward voltage (530 mV @ 20 A) and lower reverse leakage provide performance benefits in 10 A applications.

Q: What is the difference between Schottky and Super Barrier diode technology?

A: Both technologies are fast-recovery rectifier types meeting the ≤ 500 ns speed specification. Super Barrier technology, used in the SBR4040CTFP, is an advanced variant that typically offers improved forward voltage characteristics and lower leakage current compared to standard Schottky designs, as evidenced by the SBR4040CTFP's 530 mV forward voltage versus the original 550 mV.