STTH8S06FP Equivalent & Substitute Parts

Part Overview

The STTH8S06FP is a 600 V, 8 A ultrafast boost diode manufactured by STMicroelectronics in a through-hole TO-220FPAC package. This component is classified as an active product and is RoHS3 compliant. The diode is designed for fast recovery applications with a reverse recovery time of 18 ns, making it suitable for high-frequency switching circuits and power conversion applications.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from equivalent alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

STTH8S06FP

STMicroelectronicsIn Stock: 23860STTH8S06FP Datasheet

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BYC8X-600,127

WeEn SemiconductorsIn Stock: 7209BYC8X-600,127 Datasheet

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DHG5I600PM

IXYSIn Stock: 895DHG5I600PM Datasheet

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FFPF10UA60ST

onsemiIn Stock: 17526FFPF10UA60ST Datasheet

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MSRF860G

onsemiIn Stock: 845MSRF860G Datasheet

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RFNL5TJ6SGC9

Rohm SemiconductorIn Stock: 1893RFNL5TJ6SGC9 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STTH8S06FP is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 600 V
• Current - Average Rectified (Io): 8 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Through Hole
• Package / Case: TO-220-2 Full Pack or compatible variant

Secondary Compatibility Factors:

• Operating Temperature - Junction capability
• RoHS3 Compliance
• Moisture Sensitivity Level (MSL)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (8 A rated current): Parts that match both the 600 V reverse voltage and 8 A average rectified current specifications. These parts maintain identical current handling capacity and voltage rating.

Category B - Reduced Current Alternatives (5 A or 10 A rated current): Parts that maintain the 600 V reverse voltage specification but differ in average rectified current rating. These are listed as available substitutes but require circuit-level evaluation for current capacity compatibility.

Parameter Comparison

Engineering Selection Recommendations

Recommended Active Substitutes:

BYC8X-600,127 (WeEn Semiconductors) is the primary equivalent substitute. This part maintains identical voltage (600 V) and current (8 A) ratings as the STTH8S06FP. Both components are active products with RoHS3 compliance and MSL 1 rating. The BYC8X-600,127 features a lower forward voltage drop (2.9 V vs. 3.4 V at 8 A), which may provide improved thermal performance in power conversion applications. The TO-220FP package is mechanically compatible with TO-220FPAC. The reverse recovery time is longer (52 ns vs. 18 ns), which is acceptable for applications where the STTH8S06FP's ultrafast recovery is not a critical design requirement.

Reduced Current Alternatives:

DHG5I600PM (IXYS) and RFNL5TJ6SGC9 (Rohm Semiconductor) are both active products rated for 5 A average rectified current at 600 V. These parts are suitable only for applications where the circuit design permits operation at reduced current capacity. Both components are RoHS3 compliant with MSL 1 rating. DHG5I600PM operates to 150°C junction temperature and features a reverse recovery time of 35 ns. RFNL5TJ6SGC9 also operates to 150°C and has a reverse recovery time of 130 ns with the lowest forward voltage drop (1.3 V at 5 A) among the 5 A alternatives.

Obsolete Parts:

FFPF10UA60ST (onsemi) and MSRF860G (onsemi) are classified as obsolete products. FFPF10UA60ST is rated for 10 A at 600 V but carries obsolete status. MSRF860G is rated for 8 A at 600 V with obsolete status. Both components are RoHS3 compliant. These parts should not be selected for new designs or long-term production applications due to their discontinued status.

Frequently Asked Questions (FAQ)

Q: Can BYC8X-600,127 be used as a direct replacement for STTH8S06FP?

A: Yes, BYC8X-600,127 is a direct electrical equivalent. Both parts are rated for 600 V reverse voltage and 8 A average rectified current. Both are active products with RoHS3 compliance and MSL 1 rating. The TO-220FP package is mechanically compatible with TO-220FPAC. The primary difference is the reverse recovery time (52 ns vs. 18 ns), which is acceptable for most applications unless ultrafast recovery is a specific circuit requirement.

Q: Why is the STTH8S06FP rated for 175°C junction temperature while most substitutes are rated for 150°C?

A: The STTH8S06FP has a higher maximum junction temperature specification (175°C) compared to most substitute parts (150°C). This difference reflects the thermal design characteristics of each manufacturer's process technology. For applications operating near the upper temperature limit, the STTH8S06FP provides additional thermal margin. Substitute parts with 150°C ratings are suitable for applications where junction temperature remains below this threshold.

Q: Can DHG5I600PM or RFNL5TJ6SGC9 be used in place of STTH8S06FP?

A: These 5 A rated parts can be used only if the circuit design permits operation at reduced current capacity. The STTH8S06FP is rated for 8 A average rectified current, while DHG5I600PM and RFNL5TJ6SGC9 are rated for 5 A. Using a lower-rated component in a circuit designed for 8 A operation will result in component overstress and potential failure. Circuit-level analysis is required to confirm that actual operating current does not exceed 5 A.

Q: What is the significance of the forward voltage drop differences among substitute parts?

A: Forward voltage drop (Vf) directly affects power dissipation and thermal performance. The STTH8S06FP has a Vf of 3.4 V at 8 A, while BYC8X-600,127 has 2.9 V at 8 A. Lower forward voltage results in reduced power loss and lower junction temperature during operation. MSRF860G has the lowest forward voltage (1.7 V at 8 A) among 8 A rated parts, but this part is obsolete. For thermal-sensitive applications, parts with lower forward voltage may provide improved performance.

Q: Are the TO-220FP and TO-220FPAC packages interchangeable?

A: Both TO-220FP and TO-220FPAC are through-hole TO-220 variants with two leads and a full pack configuration. These packages are mechanically and electrically compatible for PCB mounting and circuit operation. The primary difference is in the specific thermal and isolation characteristics defined by each manufacturer's package specification. Substitution between these package variants is acceptable for standard applications.

Q: Why should FFPF10UA60ST and MSRF860G be avoided?

A: Both FFPF10UA60ST and MSRF860G are classified as obsolete products. Obsolete components present supply chain risks, including unavailability, price volatility, and potential quality issues from remaining inventory. For new designs and production applications, active products such as BYC8X-600,127 should be selected to ensure long-term component availability and consistent quality.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates that the diode is classified as a fast recovery rectifier with a reverse recovery time of 500 nanoseconds or less when tested at reverse recovery current greater than 200 milliamps. All listed substitute parts meet this fast recovery classification, making them suitable for high-frequency switching applications where fast switching transitions are required.

Q: Is RoHS3 compliance important for substitute selection?

A: Yes, RoHS3 compliance is a regulatory requirement in many markets and is specified for the STTH8S06FP. All recommended substitute parts listed in this document are RoHS3 compliant, ensuring compatibility with environmental regulations and customer requirements. Parts that do not meet RoHS3 compliance should not be selected as substitutes.