FFSH20120A Equivalent & Substitute Parts

Part Overview

The FFSH20120A is a silicon carbide Schottky diode manufactured by onsemi, rated for 1200 V DC reverse voltage and 30 A average rectified current in a TO-247-2 through-hole package. This component is classified as Last Time Buy, indicating that onsemi has discontinued or will discontinue production. Finding equivalent substitute parts is necessary to ensure continued availability for new designs, repairs, and production continuity.

Substiute Parts

FFSH20120A

onsemiIn Stock: 16832FFSH20120A Datasheet

Current PartRFQ

S4D20120H

SMC Diode SolutionsIn Stock: 1341S4D20120H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FFSH20120A is determined by the following critical parameters:

Voltage Rating: The substitute part must maintain the 1200 V DC reverse voltage specification to ensure safe operation in the same circuit topology.

Current Rating: The substitute part current rating must equal or exceed the 30 A average rectified current requirement. Parts with lower current ratings cannot be used as direct substitutes without circuit redesign.

Technology: Silicon carbide Schottky diode technology must be maintained to preserve the zero reverse recovery time characteristic and thermal performance of the original design.

Package Type: The TO-247-2 through-hole package is required for mechanical and thermal compatibility with existing PCB layouts and heatsinking arrangements.

Compliance Standards: RoHS3 compliance is mandatory for regulatory adherence in target markets.

The S4D20120H from SMC Diode Solutions shares the same voltage rating (1200 V) and technology (SiC Schottky), operates in the same package family (TO-247), and maintains RoHS3 compliance. However, the current rating of 20 A is lower than the 30 A specification of the FFSH20120A, which represents a functional limitation in this substitute relationship.

Parameter Comparison

Engineering Selection Recommendations

FFSH20120A (onsemi): This part is designated Last Time Buy, indicating production discontinuation. Existing inventory of 16,797 pieces is available. Selection of this part is appropriate only for existing designs with committed long-term inventory or for applications where the 30 A current rating is critical and no alternative exists.

S4D20120H (SMC Diode Solutions): This part maintains Active product status with 1,300 pieces in stock. It shares identical voltage rating, technology, and compliance certifications with the FFSH20120A. The primary difference is the reduced current rating of 20 A versus 30 A. This substitute is suitable for applications where the circuit current requirement does not exceed 20 A. The lower reverse leakage current (40 µA versus 200 µA) and slightly higher forward voltage (1.8 V versus 1.75 V at 20 A) are secondary considerations. The TO-247AC package variant maintains mechanical compatibility with TO-247-2 footprints in most applications.

For new designs, the S4D20120H is the preferred selection due to active product status and regulatory compliance. For existing designs operating at currents below 20 A, direct substitution is feasible. For applications requiring the full 30 A rating, alternative sources must be evaluated or circuit redesign must be considered.

Frequently Asked Questions (FAQ)

Q: Can the S4D20120H directly replace the FFSH20120A in all applications?

A: Direct replacement is possible only in applications where the circuit current does not exceed 20 A. The S4D20120H is rated for 20 A average rectified current, while the FFSH20120A is rated for 30 A. Exceeding the 20 A rating of the substitute part will result in component failure.

Q: Are the TO-247-2 and TO-247AC packages mechanically compatible?

A: Both packages are TO-247 variants with through-hole mounting. The TO-247AC is a variant of the TO-247-2 package family. Mechanical compatibility with existing PCB layouts and heatsinking is maintained, though pin configuration should be verified against the specific datasheet for each part.

Q: What is the significance of the reverse leakage current difference?

A: The S4D20120H exhibits lower reverse leakage current (40 µA at 1200 V) compared to the FFSH20120A (200 µA at 1200 V). Lower leakage current reduces standby power dissipation and heat generation. This is a favorable characteristic and does not present a compatibility issue.

Q: Why is the FFSH20120A designated Last Time Buy?

A: Last Time Buy status indicates that onsemi has ceased or will cease production of this part. Existing inventory is available for purchase, but no future production is planned. This designation necessitates identification of substitute parts for long-term supply chain continuity.

Q: Are both parts RoHS3 compliant?

A: Yes, both the FFSH20120A and S4D20120H are ROHS3 compliant, meeting regulatory requirements for hazardous substance restrictions in target markets.

Q: What is the forward voltage difference between these parts?

A: At 20 A, the FFSH20120A has a maximum forward voltage of 1.75 V, while the S4D20120H has a maximum forward voltage of 1.8 V. This 0.05 V difference is negligible in most circuit applications and does not present a functional compatibility issue.