STTH4R02 Equivalent & Substitute Parts

Part Overview

The STTH4R02 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 4 A average rectified current in a DO-201AB through-hole axial package. This component is classified as obsolete, indicating it is no longer in active production. Locating equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is unavailable or inventory is depleted.

Substiute Parts

STTH4R02

STMicroelectronicsIn Stock: 3003STTH4R02 Datasheet

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HER503GP-TP

Micro Commercial CoIn Stock: 5795HER503GP-TP Datasheet

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UG4D-M3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 9917UG4D-M3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STTH4R02 are selected based on the following critical electrical and mechanical parameters:

Voltage Rating: All substitutes must maintain a DC reverse voltage rating of 200 V or higher to ensure safe operation in the original circuit.

Current Rating: Substitute parts must support the 4 A average rectified current requirement. Parts rated at 5 A or higher satisfy this criterion.

Recovery Characteristics: All substitutes must operate as fast recovery diodes with reverse recovery time ≤ 500 ns to maintain switching performance in the original application.

Package Compatibility: Substitutes must use through-hole axial packages (DO-201AB or DO-201AD) to ensure mechanical fit in existing PCB layouts.

Compliance & Status: All substitutes must be RoHS3 compliant and have defined product status (Active or Not For New Designs) to ensure regulatory compliance and supply chain viability.

Parameter Comparison

Engineering Selection Recommendations

UG4D-M3/54 (Preferred Substitute)

The UG4D-M3/54 from Vishay General Semiconductor is the primary substitute for the STTH4R02. This part carries Active product status, ensuring ongoing availability and supply chain support. It matches the 4 A current rating and 200 V voltage specification exactly. The reverse recovery time of 30 ns is identical to the original part, and forward voltage drop (950 mV @ 4 A) is lower, resulting in reduced power dissipation. The operating temperature range (-55°C ~ 150°C) is suitable for most industrial applications, though the maximum junction temperature is 25°C lower than the original. RoHS3 compliance is confirmed. This part is available in Tape & Reel packaging, supporting high-volume procurement.

HER503GP-TP (Secondary Substitute)

The HER503GP-TP from Micro Commercial Co meets the 200 V voltage and fast recovery speed requirements. The 5 A current rating exceeds the 4 A requirement, providing design margin. However, this part carries Not For New Designs status, indicating limited future availability. The reverse recovery time of 50 ns is 20 ns longer than the original, which may affect switching performance in time-critical applications. The operating temperature maximum of 150°C is 25°C lower than the original. RoHS3 compliance is confirmed. This part is available in Cut Tape packaging.

Frequently Asked Questions (FAQ)

Q: Can the HER503GP-TP be used as a direct replacement for the STTH4R02?

A: The HER503GP-TP is electrically compatible with the STTH4R02 in terms of voltage and current ratings. However, the reverse recovery time is 50 ns compared to 30 ns for the original, which may introduce switching delays in high-frequency applications. The Not For New Designs status indicates declining availability. The UG4D-M3/54 is preferred for new applications.

Q: What is the difference between DO-201AB and DO-201AD packages?

A: Both are through-hole axial diode packages with identical mechanical fit and PCB mounting characteristics. The designation difference reflects manufacturer-specific package specifications. Substitution between these packages is mechanically compatible.

Q: Is the UG4D-M3/54 suitable for applications requiring a 175°C maximum junction temperature?

A: The UG4D-M3/54 has a maximum operating temperature of 150°C, which is 25°C lower than the STTH4R02. Applications requiring operation at 175°C cannot use this substitute without thermal design modifications.

Q: Why does the HER503GP-TP have a higher current rating (5 A) than the STTH4R02 (4 A)?

A: The HER503GP-TP is designed for higher current applications. When used in a 4 A circuit, it operates below its rated maximum, providing additional design margin and potentially lower forward voltage drop.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the HER503GP-TP and UG4D-M3/54 are RoHS3 compliant, matching the compliance status of the original STTH4R02.

Q: What is the significance of the reverse recovery time difference between the STTH4R02 (30 ns) and HER503GP-TP (50 ns)?

A: Reverse recovery time affects switching speed in rectifier circuits. The 20 ns difference may introduce measurable switching delays in applications operating above 10 MHz. For standard 50/60 Hz power supply applications, this difference is negligible.

Q: Can I use the UG4D-M3/54 in Cut Tape packaging instead of Tape & Reel?

A: The UG4D-M3/54 is specified only in Tape & Reel packaging. If Cut Tape packaging is required, the HER503GP-TP is available in that format, though with the trade-offs noted in the Engineering Selection Recommendations section.