STTH4R02RL Equivalent & Substitute Parts

Part Overview

The STTH4R02RL 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. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Substiute Parts

STTH4R02RL

STMicroelectronicsIn Stock: 7128STTH4R02RL Datasheet

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HER503GP-TP

Micro Commercial CoIn Stock: 5795HER503GP-TP Datasheet

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MUR420RLG

onsemiIn Stock: 125260MUR420RLG 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

Substitution of the STTH4R02RL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
• Current - Average Rectified (Io): Must equal or exceed 4 A
• Speed Classification: Must be Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): Must be ≤ 500 ns
• Mounting Type: Must be Through Hole

Mechanical Compatibility Criteria:

• Package / Case: Must be axial through-hole configuration (DO-201 series variants acceptable)

Compliance Criteria:

• RoHS Status: Must be ROHS3 Compliant
• REACH Status: Must be REACH Unaffected

All substitute parts listed meet these criteria and are therefore electrically and mechanically interchangeable with the STTH4R02RL in applications requiring these specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MUR420RLG

The MUR420RLG manufactured by onsemi is the preferred substitute for the STTH4R02RL. This part carries Active product status, ensuring long-term availability and supply chain stability. It meets all electrical specifications with identical voltage and current ratings, maintains fast recovery characteristics, and is ROHS3 compliant. The MUR420RLG demonstrates superior forward voltage performance (890 mV @ 4 A versus 1.25 V @ 12 A) and supports the full operating temperature range of the original part (−65°C to 175°C). Inventory availability is substantial at 125,200 pieces.

Secondary Recommendation: UG4D-M3/54

The UG4D-M3/54 manufactured by Vishay General Semiconductor - Diodes Division is an alternative substitute with Active product status. This part matches the STTH4R02RL in voltage, current, and reverse recovery time specifications. It provides equivalent fast recovery performance and is ROHS3 compliant. The operating temperature range is −55°C to 150°C, which covers standard industrial applications. Inventory availability is 9,900 pieces.

Tertiary Option: HER503GP-TP

The HER503GP-TP manufactured by Micro Commercial Co is a substitute with higher current rating (5 A versus 4 A) and is ROHS3 compliant. However, this part carries Not For New Designs status, limiting its suitability for new applications. It is suitable only for legacy system maintenance or replacement scenarios where supply of the original part is exhausted.

Frequently Asked Questions (FAQ)

Q: Can the MUR420RLG directly replace the STTH4R02RL in existing designs?

A: Yes. The MUR420RLG meets all critical electrical parameters: 200 V reverse voltage, 4 A average rectified current, fast recovery characteristics, and through-hole axial packaging. Both parts are ROHS3 compliant and REACH unaffected. Physical dimensions of DO-201 series packages are compatible for through-hole mounting.

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

A: These are variants within the DO-201 axial through-hole package family. All three are mechanically compatible for through-hole PCB mounting. The primary differences are in lead diameter and spacing specifications. The STTH4R02RL uses DO-201AB; substitute parts use DO-201AA or DO-201AD. All variants are suitable for standard through-hole assembly processes.

Q: Why is the HER503GP-TP marked as "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development and support for this part. While it remains functionally equivalent and available in inventory, it is not recommended for new product designs due to uncertain long-term availability and potential future discontinuation.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) differences between substitute parts result in minor variations in voltage drop across the diode during conduction. The STTH4R02RL specifies 1.25 V @ 12 A, while the MUR420RLG specifies 890 mV @ 4 A. These differences are measured at different current levels and do not prevent functional substitution. Circuit designers should verify that power dissipation and thermal management remain within acceptable limits for the specific application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (MUR420RLG, HER503GP-TP, and UG4D-M3/54) are ROHS3 compliant and REACH unaffected, matching the compliance status of the STTH4R02RL.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking after the applied voltage reverses. The STTH4R02RL specifies 30 ns. All substitute parts maintain fast recovery characteristics (≤ 500 ns) with trr values of 30 ns to 50 ns, ensuring equivalent switching performance in rectification and protection circuits.

Q: Can the UG4D-M3/54 be used in applications requiring the full −65°C to 175°C temperature range?

A: The UG4D-M3/54 supports −55°C to 150°C operation. Applications requiring operation below −55°C or above 150°C must use the MUR420RLG (−65°C to 175°C) or verify that the UG4D-M3/54 temperature range is sufficient for the specific use case.