STTH4R02BY-TR Equivalent & Substitute Parts

Part Overview

The STTH4R02BY-TR is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 4 A average rectified current. This surface mount component is housed in a TO-252-3 DPAK package and is qualified to AEC-Q101 automotive standards. The part is currently active in production with 1210 units in stock.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining package compatibility and compliance certifications. Alternative sources may be required due to supply constraints, lead time considerations, or design flexibility needs.

Substiute Parts

STTH4R02BY-TR

STMicroelectronicsIn Stock: 1299STTH4R02BY-TR Datasheet

Current PartRFQ

RFN3BM2SFHTL

Rohm SemiconductorIn Stock: 5745RFN3BM2SFHTL Datasheet

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RFN3BM2STL

Rohm SemiconductorIn Stock: 3945RFN3BM2STL Datasheet

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RFN5BM2STL

Rohm SemiconductorIn Stock: 3743RFN5BM2STL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STTH4R02BY-TR is determined by the following criteria:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
• Mounting Type: Surface Mount
• Technology: Standard
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• RoHS Status: ROHS3 Compliant
• Grade: Automotive
• Qualification: AEC-Q101

Allowable Variation Parameters:

• Current - Average Rectified (Io): Substitutes rated at 3 A or 5 A are acceptable when the application current requirement does not exceed the substitute rating
• Voltage - Forward (Vf) (Max) @ If: Minor variations acceptable within fast recovery diode specifications
• Reverse Recovery Time (trr): Faster recovery times are acceptable
• Current - Reverse Leakage @ Vr: Variations within standard diode leakage ranges are acceptable
• Operating Temperature - Junction: Substitutes with lower maximum junction temperature are acceptable if application does not require the full -40°C to 175°C range

Three substitute parts meet these criteria: RFN3BM2SFHTL (3 A, Cut Tape packaging), RFN3BM2STL (3 A, Tape & Reel packaging), and RFN5BM2STL (5 A, Cut Tape packaging).

Parameter Comparison

Engineering Selection Recommendations

RFN3BM2SFHTL (Rohm Semiconductor, 3 A, Cut Tape & Digi-Reel®)

This substitute is suitable for applications where the circuit current requirement does not exceed 3 A. The part maintains full compliance with AEC-Q101 automotive qualification and ROHS3 standards. The faster reverse recovery time (25 ns versus 30 ns) provides improved switching performance. The lower maximum junction temperature (150°C versus 175°C) requires verification that the application thermal environment remains within this limit. Packaging is available in Cut Tape and Digi-Reel® format.

RFN3BM2STL (Rohm Semiconductor, 3 A, Tape & Reel)

This substitute is functionally equivalent to RFN3BM2SFHTL with identical electrical specifications. The primary distinction is packaging format: Tape & Reel (TR) matches the original STTH4R02BY-TR packaging configuration. This option is preferred when reel-based assembly processes are required. Current rating is limited to 3 A. Full AEC-Q101 and ROHS3 compliance is maintained.

RFN5BM2STL (Rohm Semiconductor, 5 A, Cut Tape & Digi-Reel®)

This substitute provides a higher current rating of 5 A, making it suitable for applications requiring current capacity above 4 A. The part maintains all automotive and compliance certifications. The faster reverse recovery time (25 ns) and lower maximum junction temperature (150°C) apply to this variant as well. Packaging is available in Cut Tape and Digi-Reel® format only.

All three substitutes are active products with confirmed inventory availability and meet the mandatory electrical and compliance requirements for general-purpose rectification in automotive applications.

Frequently Asked Questions (FAQ)

Q: Can RFN3BM2SFHTL or RFN3BM2STL be used as direct replacements for STTH4R02BY-TR?

A: These parts are suitable substitutes only when the application circuit current does not exceed 3 A. Both parts maintain identical voltage ratings (200 V), package configuration (TO-252-3 DPAK), and automotive qualifications (AEC-Q101). The lower current rating is the limiting factor for direct substitution in circuits designed for the full 4 A capability of the original part.

Q: What is the difference between RFN3BM2SFHTL and RFN3BM2STL?

A: Both parts are manufactured by Rohm Semiconductor with identical electrical specifications (200 V, 3 A, 25 ns reverse recovery time). The primary difference is packaging format: RFN3BM2SFHTL is supplied in Cut Tape (CT) and Digi-Reel® format, while RFN3BM2STL is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements and reel compatibility.

Q: When should RFN5BM2STL be selected instead of the 3 A alternatives?

A: RFN5BM2STL is selected when the application requires current capacity exceeding 4 A. This part provides 5 A average rectified current while maintaining the same 200 V voltage rating and TO-252-3 DPAK package. All automotive and compliance certifications remain unchanged.

Q: Are all substitute parts AEC-Q101 qualified?

A: Yes. All three substitute parts (RFN3BM2SFHTL, RFN3BM2STL, and RFN5BM2STL) carry AEC-Q101 automotive qualification and are rated for automotive-grade applications. ROHS3 compliance is confirmed for all substitutes.

Q: What is the impact of the lower maximum junction temperature (150°C) on the Rohm substitutes?

A: The Rohm parts are rated to a maximum junction temperature of 150°C, compared to 175°C for the STTH4R02BY-TR. This specification must be evaluated against the application's thermal environment. If the circuit design ensures junction temperature remains below 150°C under worst-case operating conditions, the substitutes are fully compatible. Applications requiring operation above 150°C junction temperature require the original STTH4R02BY-TR or equivalent parts with higher temperature ratings.

Q: Do the faster reverse recovery times (25 ns) of the Rohm parts provide any advantage?

A: Yes. The Rohm substitutes feature a reverse recovery time of 25 ns compared to 30 ns for the STTH4R02BY-TR. Faster recovery times reduce switching losses and improve efficiency in high-frequency rectification circuits. This represents a performance improvement over the original part specification.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: All substitute parts use the identical TO-252-3 DPAK package with the same pinout and footprint. PCB layout and assembly processes require no modification. However, current rating differences must be considered: circuits designed for 4 A operation cannot use the 3 A variants without circuit redesign or derating.

Q: What inventory levels are available for each substitute?

A: RFN3BM2SFHTL has 5640 units in stock, RFN3BM2STL has 3900 units in stock, and RFN5BM2STL has 3700 units in stock. The original STTH4R02BY-TR has 1210 units in stock. Inventory levels should be confirmed at time of procurement.